CN114597610A - Battery with a battery cell - Google Patents

Battery with a battery cell Download PDF

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Publication number
CN114597610A
CN114597610A CN202210304872.1A CN202210304872A CN114597610A CN 114597610 A CN114597610 A CN 114597610A CN 202210304872 A CN202210304872 A CN 202210304872A CN 114597610 A CN114597610 A CN 114597610A
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CN
China
Prior art keywords
side plate
tab
adapter
battery
battery cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210304872.1A
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Chinese (zh)
Inventor
卫志达
彭宁
谢继春
王智峰
厉成北
章辉
席阳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Battery Co Ltd
Original Assignee
Zhuhai Cosmx Battery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuhai Cosmx Battery Co Ltd filed Critical Zhuhai Cosmx Battery Co Ltd
Priority to CN202210304872.1A priority Critical patent/CN114597610A/en
Publication of CN114597610A publication Critical patent/CN114597610A/en
Priority to PCT/CN2023/075904 priority patent/WO2023185283A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The present invention provides a battery comprising: the shell is enclosed into a cavity; the shell comprises a first side plate, and the first side plate is provided with a first through hole communicated with the cavity; the battery cell is positioned in the cavity; the battery cell is provided with a first tab; the first adapter is electrically connected with the first tab; the first adapter is arranged between the first side plate and the battery core, a second through hole is formed in the first adapter, the first adapter is connected with the first side plate, and at least part of the projection of the first through hole and the projection of the second through hole on the first side plate are overlapped. The invention can improve the performances of the battery such as sealing performance, safety and the like.

Description

Battery with a battery cell
Technical Field
The invention relates to the field of electrochemical energy storage devices, in particular to a battery.
Background
At present, electrochemical devices represented by batteries are widely used, for example, lithium ion batteries have the advantages of large capacity, small volume, light weight, environmental protection and the like, and are widely used in industries such as digital electronic products and electric automobiles. With the development of technology, the requirements for the sealing performance and safety of batteries are also increasing, and therefore, the improvement of the sealing performance and safety of batteries is urgently needed.
Disclosure of Invention
The invention provides a battery having good sealing performance, safety and other performances.
The present invention provides a battery comprising: the shell is enclosed into a cavity; the shell comprises a first side plate, and the first side plate is provided with a first through hole communicated with the cavity; the battery cell is positioned in the cavity; the battery cell is provided with a first tab; the first adapter is electrically connected with the first tab; the first adapter is arranged between the first side plate and the battery core, a second through hole is formed in the first adapter, the first adapter is connected with the first side plate, and at least part of the projection of the first through hole and the projection of the second through hole on the first side plate are overlapped.
According to an embodiment of the present invention, one of the projections of the first through hole and the second through hole on the first side plate covers the other; and/or the concentricity of the first through hole and the second through hole is less than or equal to 1.5 mm.
According to an embodiment of the present invention, the first through hole and the second through hole are coaxially disposed.
According to an embodiment of the present invention, a projection of the first adapter on the first side plate and a projection of the first tab on the first side plate do not overlap.
According to an embodiment of the present invention, the housing further includes a second side plate connected to the first side plate, and a projection of the first adapter on the second side plate at least partially overlaps a projection of the first tab on the second side plate.
According to an embodiment of the present invention, the battery further includes a first coupling member located between the battery cell and the first side plate, and the first coupling member is connected to the first tab and the first coupling member, respectively.
According to an embodiment of the present invention, the first coupling member includes a first connecting piece connected to the first coupling member, and a fourth connecting piece connected to a side of the first tab facing away from the battery cell.
According to an embodiment of the present invention, the first coupling member further includes a connection assembly connected to the first connection piece and the fourth connection piece, respectively; the connecting component comprises a second connecting sheet and a third connecting sheet; the second connecting piece is positioned between the first adapter piece and the battery cell; the third connecting piece is positioned between the first tab and the first adapter in the direction from the first adapter to the first tab; the first connecting sheet, the second connecting sheet, the third connecting sheet and the fourth connecting sheet are connected in sequence.
According to an embodiment of the present invention, the first connecting piece includes a first connecting portion connected to the first connecting piece, and a second connecting portion extending along an extending direction of the first side plate, and the second connecting portion is connected to the fourth connecting piece.
According to an embodiment of the present invention, a sixth insulating layer is further disposed on a side of the first connecting piece away from the first connecting piece; and/or a first included angle is formed between one surface of the first adapter piece connected with the first connecting piece and one surface of the fourth connecting piece connected with the first pole lug, and the range of the first included angle is 80-120 degrees; and/or the first connecting piece is welded with the first adapter; and/or the battery cell comprises a plurality of electrode plates which are arranged in a stacked mode, and one surface, connected with the first adapter, of the first connecting piece is parallel to the surface of the electrode plate; and/or a second included angle is formed between one surface of the first rotating connector, which is connected with the first side plate, and one surface of the first rotating connector, which is connected with the first connecting sheet, and the range of the second included angle is 80-120 degrees; and/or an overlapping region exists between the projection of the first adapter piece in the thickness direction of the battery cell and the projection of the first connecting piece in the thickness direction of the battery cell.
According to an embodiment of the present invention, a third groove is disposed on a side of the first adaptor facing away from the first side plate, and the third groove is respectively communicated with the second through hole and the cavity.
According to an embodiment of the present invention, a cross section of the third groove parallel to a direction from a side of the first adaptor facing the first side plate to a side of the first adaptor facing away from the first side plate is an arc shape; and/or the minimum thickness of the first rotating connector in the direction from the first side plate to the first rotating connector is 0.2-1 mm; and/or the minimum thickness of the first adapter piece in the thickness direction of the battery core is 0.2-1 mm.
According to an embodiment of the present invention, the first adapter includes a first adapter portion and a second adapter portion that enclose the third groove, the first adapter portion is provided with the second through hole, and the first adapter portion is connected to the first side plate; the battery also comprises a first connecting piece which is respectively connected with the first lug and the second adapting part; one or more reinforcing ribs are arranged between the second switching part and the first switching part.
According to an embodiment of the present invention, a connection portion between the second adapter portion and the first adapter portion has a reinforcing region corresponding to the position of the reinforcing rib, and the reinforcing region is recessed toward an included angle between the second adapter portion and the first adapter portion to form the reinforcing rib; and/or the included angle between the connecting line between one end of the reinforcing rib connected with the first switching part and one end of the reinforcing rib connected with the second switching part and the surface of the first switching part is 30-60 degrees; and/or the included angle between the connecting line between one end of the reinforcing rib connected with the first adapter part and one end of the reinforcing rib connected with the second adapter part and the surface of the second adapter part is 30-60 degrees.
According to an embodiment of the present invention, the first adapter further includes a third adapter portion connected to the first adapter portion, and the third adapter portion and the second adapter portion are respectively located on two opposite sides of the first adapter portion.
According to an embodiment of the present invention, the first joint part further comprises a third insulation layer, wherein the third insulation layer is located between the first joint part and the first side plate.
According to an embodiment of the invention, the first coupling member comprises a fourth connecting piece which adjoins a side of the first tab facing away from the cell, and the third insulating layer comprises a first portion on a side of the fourth connecting piece facing away from the first tab.
According to an embodiment of the present invention, the battery cell includes a plurality of electrode sheets stacked in layers; the battery cell is provided with a first surface and a second surface which are oppositely arranged; the third insulating layer further comprises a second portion formed by extending from one end, close to the first surface of the battery cell, of the first portion to the direction close to the battery cell, and a third portion formed by extending from one end, close to the second surface of the battery cell, of the first portion to the direction close to the battery cell.
According to an embodiment of the present invention, a projection of the first tab in the thickness direction of the battery cell is located within a projection of the second portion of the third insulating layer in the thickness direction of the battery cell, and/or a projection of the first tab in the thickness direction of the battery cell is located within a projection of the third portion of the third insulating layer in the thickness direction of the battery cell; and/or the projection of the first tab in the length direction of the battery cell is positioned in the projection of the first part of the third insulating layer in the length direction of the battery cell.
According to an embodiment of the present invention, the second portion of the third insulating layer extends to the first surface of the battery cell and is bonded to the electrode sheet located on the first surface of the battery cell; and/or the third part of the third insulating layer extends to the second surface of the battery cell and is bonded with the electrode plate positioned on the second surface of the battery cell.
According to an embodiment of the present invention, a second insulating layer is disposed between the first adapter and the battery cell.
According to an embodiment of the present invention, the battery includes a plurality of electrode sheets stacked in layers, the battery cell has a first surface and a second surface opposite to each other, wherein the second insulating layer extends to the first surface of the battery cell and is bonded to the electrode sheet located on the first surface of the battery cell, and/or the second insulating layer extends to the second surface of the battery cell and is bonded to the electrode sheet located on the second surface of the battery cell.
According to an embodiment of the present invention, an end surface of the battery cell on a side provided with the first tab is parallel to a thickness direction of the battery cell; and/or the distance from one side of the first lug departing from the battery cell to the side of the first lug connected with the battery cell is not greater than the length of the first adapter along the direction from the first side plate to the first lug; and/or the length of the first adapter piece is 1mm-4mm along the direction from the first side plate to the first tab; and/or the first transfer part is welded with the first side plate.
According to an embodiment of the present invention, the battery cell is further provided with a second tab, and the polarity of the second tab is opposite to that of the first tab; the battery further comprises a second adaptor, the second adaptor is electrically connected with the second lug, the second adaptor is arranged between the first side plate and the battery core, and the projection of the second adaptor on the first side plate is not overlapped with the projection of the second lug on the first side plate.
According to an embodiment of the present invention, the housing includes a second side plate connected to the first side plate; the projection of the first tab on the second side plate at least partially overlaps the projection of the second tab on the second side plate; and/or the projection of the second adapter on the second side plate at least partially overlaps with the projection of the second pole ear on the second side plate; and/or the projection of the first adapter on the second side plate is at least partially overlapped with the projection of the second adapter on the second side plate.
According to an embodiment of the present invention, the first tab and the second tab are located between the first adaptor and the second adaptor; and/or the distance from one side of the second pole lug, which is away from the battery cell, to the side, which is connected with the battery cell, of the second pole lug is not greater than the length of the second adaptor along the direction from the first side plate to the second pole lug; and/or the length of the second adaptor is 1mm-3mm along the direction from the first side plate to the second tab; and/or the length of the second adapter piece is smaller than that of the first adapter piece along the direction from the first side plate to the second pole lug.
According to an embodiment of the present invention, the first tab is a negative tab or a positive tab; and/or the battery cell comprises a laminated battery cell or a winding battery cell.
According to the invention, the first through hole is used as the liquid injection hole for injecting electrolyte into the cavity, the first side plate provided with the first through hole is connected with the first transfer part of the first transfer part, at least part of the first through hole is overlapped with the second through hole, the first through hole is communicated with the cavity through the second through hole, liquid injection is realized, meanwhile, the first transfer part can support the part (namely the side wall of the first through hole) of the first side plate surrounding the first through hole, the part of the first side plate surrounding the first through hole is prevented from deforming in the processes of sealing and welding of the liquid injection hole and the like, for example, the sealing and welding of the liquid injection hole are facilitated, the sealing performance of the liquid injection hole after welding is improved, and the performances of the battery such as sealing performance, safety and the like are further improved.
Drawings
Fig. 1 is a schematic diagram of a battery structure according to an embodiment of the invention;
FIG. 2 is a schematic view of a connection structure of the first connecting member, the first connecting member and the housing according to an embodiment of the invention;
FIG. 3 is a schematic view of a connection structure of the first connecting member, the first connecting member and the housing according to an embodiment of the invention;
FIG. 4 is a schematic view of a connection structure between a first adapter and a housing according to an embodiment of the invention;
FIG. 5 is a schematic view of a connection structure between a first adapter and a housing according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a first adapter according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a first adapter according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a first adapter according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a first adapter in accordance with an embodiment of the invention;
FIG. 10 is a cross-sectional view of a first adapter in accordance with an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a first adapter according to an embodiment of the present invention;
fig. 12 is a schematic view of a connection structure between a second adaptor and a housing according to an embodiment of the invention;
fig. 13 is a schematic view of a connection structure between a second adaptor and a housing according to an embodiment of the invention;
fig. 14 is a schematic structural view of a second insulating sheet according to an embodiment of the invention;
fig. 15 is a schematic diagram of a cell packaging structure according to an embodiment of the invention;
fig. 16 is a schematic diagram of a cell packaging structure according to an embodiment of the present invention.
Description of reference numerals: 1: a housing; 11: a first side plate; 12: a second side plate; 13: a third side plate; 14: a fourth side plate; 15: a fifth side plate; 16: a sixth side plate; 17: a circular arc transition portion; 100: a first through hole; 151: a thinning portion; 110: a fifth through hole; 2: an electric core; 21: a first tab; 22: a second tab; 31: a first transfer member; 300: a third groove; 310: a second through hole; 311: first transfer jointA section; 312: a second transfer part; 313: a third switching part; 314: a reinforcement region; 315: reinforcing ribs; 32: a second adaptor; 320: a third through hole; 41: an outer tab; 42: a pole column; 43: an extension portion; 5: a first coupling member; 5': a second coupling member; 51: a first connecting piece; 52: a second connecting sheet; 53: a third connecting sheet; 54: a fourth connecting sheet; 55: a fifth connecting sheet; 56: a sixth connecting sheet; 57: a seventh connecting piece; 58: an eighth connecting sheet; 511: a first connection portion; 512: a second connecting portion; 551: a third connecting portion; 552: a fourth connecting portion; 6: a first insulating sheet; 60: a sixth through hole; 7: a second insulating sheet; 70: a fourth via hole; 71: a first insulating portion; 72: a second insulating section; 81: a first insulating layer; 82: a second insulating layer; 83: a third insulating layer; 84: a fourth insulating layer; 85: a fifth insulating layer; 86: a sixth insulating layer; 9: a protective adhesive layer; 90: a seventh via hole; alpha is alpha1: a fifth included angle; alpha is alpha2: and a sixth angle.
Detailed Description
The present invention is described in further detail below in order to enable those skilled in the art to better understand the aspects of the present invention. The following detailed description is of the principles and features of the invention, and is intended to be illustrative only and not limiting in scope. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and can include, for example, fixed or removable connections or integral connections; the connection can be mechanical connection, electrical connection or communication connection (network connection); the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected to each other. Those skilled in the art will understand what is specifically meant by the present invention. Furthermore, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. are used for descriptive purposes only, such as to distinguish various components, to more clearly explain/explain the technical solution, and are not to be interpreted as indicating or implying any number or order of the indicated technical features, etc. In addition, the terms "parallel", "perpendicular", "equal", etc. are approximate, and the numerical values and numerical ranges involved are approximate, and some errors may exist due to the influence of specific operation processes such as measurement, manufacturing process, etc., which can be considered as negligible by those skilled in the art.
The battery is a commonly used electrochemical energy storage device, and generally includes a casing, an electric core encapsulated in a cavity defined by the casing, and an electrolyte injected into the cavity, wherein a liquid injection hole is formed in the casing for injecting the electrolyte into the cavity, and after the electrolyte is injected, the liquid injection hole is sealed, and a sealing sheet is generally welded on the casing around the liquid injection hole to seal the liquid injection hole, so as to realize sealing. However, in the process of sealing the pour hole by welding the seal piece, the case around the pour hole is likely to be deformed, resulting in poor sealing performance.
In view of the above problems, an embodiment of the present invention provides a battery, as shown in fig. 1 to 16, including: the shell 1 is enclosed into a cavity; the shell 1 comprises a first side plate 11, and the first side plate 11 is provided with a first through hole 100 communicated with the cavity; the battery cell 2 is positioned in the cavity; the battery core 2 is provided with a first tab 21; a first adaptor 31 electrically connected to the first tab 21; the first adapter 31 is disposed between the first side plate 11 and the battery cell 2, the first adapter 31 is provided with a second through hole 310, the first adapter 31 is connected to the first side plate 11, and a projection of the first through hole 100 and a projection of the second through hole 310 on the first side plate 11 at least partially overlap (that is, a projection of the first through hole 100 parallel to the extending direction of the first side plate 11 and a projection of the second through hole 310 parallel to the extending direction of the first side plate 11 at least partially overlap).
The first through hole 100 formed in the first side plate 11 can be used as a liquid injection hole, so that the first side plate 11 is connected to the first transfer part 311, and the first through hole 100 and the second through hole 310 are at least partially overlapped, the first through hole 100 is communicated with the cavity through the second through hole 310 for injecting liquid, meanwhile, the first transfer piece 31 is connected to the part of the first side plate 11 surrounding the first through hole 100 (i.e. the part of the casing 1 surrounding the liquid injection hole), so that the first transfer piece 31 supports the part of the first side plate 11 surrounding the first through hole 100, and prevents the part of the first side plate 11 surrounding the first through hole 100 from deforming in the processes of sealing and welding of the liquid injection hole, thereby facilitating the operations of welding of the sealing sheet and the like, and improving the sealing performance after sealing of the liquid injection hole.
Specifically, the radius of the projection of the first through hole 100 on the first side plate 11 is r1The projection radius of the second through hole 310 on the first side plate 11 is r2The distance L < r between the center of the projection of the first through hole 100 on the first side plate 11 and the circle of the projection of the second through hole 310 on the first side plate 111+r2. Wherein r is1≥r2Or r1≤r2。
The projection of the first through hole 100 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11 may be partially overlapped, or may be completely overlapped, and the completely overlapping case may specifically include: one of the projection of the first through hole 100 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11 covers the other, that is, the projection of the first through hole 100 on the first side plate 11 covers the projection of the second through hole 310 on the first side plate 11, or the projection of the second through hole 310 on the first side plate 11 covers the projection of the first through hole 100 on the first side plate 11.
Illustratively, the radius (or area) of the projection of the second through hole 310 on the first side plate 11 is smaller than the projection of the first through hole 100 on the first side plate 11, and the projection of the second through hole 310 on the first side plate 11 is located within the projection of the first through hole 100 on the first side plate 11; or the radius (or area) of the projection of the first through hole 100 on the first side plate 11 is smaller than the projection of the second through hole 310 on the first side plate 11, and the projection of the first through hole 100 on the first side plate 11 is located in the projection of the second through hole 310 on the first side plate 11; alternatively, the projection of the first through hole 100 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11The projections coincide (both are coaxially arranged, and r is1＝r2)。
In some preferred embodiments, the concentricity of the first through hole 100 and the second through hole 310 is less than or equal to 1.5mm, that is, the distance between the center of the projection of the first through hole 100 on the first side plate 11 and the center of the projection of the second through hole 310 on the first side plate 11 is less than or equal to 1.5mm, and it is generally more preferred that the first through hole 100 and the second through hole 310 are coaxially arranged, that is, the concentricity is 0.
In addition, the first tab 21 may be electrically connected to the first side plate 11 (the housing 1) through a first adaptor 31, and the first adaptor 31 and the first side plate 11 may be welded.
The battery may further include a first coupling member 5 located between the electric core 2 and the first side plate 11, where the first coupling member 5 is connected to the first tab 21 and the first adaptor 31 (that is, the first adaptor 31 is connected to the first tab 21 through the first coupling member), and specifically, the first adaptor 31, the first coupling member 5, and the first tab 21 may be welded in sequence.
In particular, the first coupling piece 5 may comprise a first connecting tab 51 connected to the first coupling piece 31, and a fourth connecting tab 54 connected to the side of the first tab 21 facing away from the battery cell 2.
As shown in fig. 1 to 3, 15 and 16, the first coupling member may have a bent structure, the first connecting plate 51 is connected to the first connecting member 31, the fourth connecting plate 54 is connected to the first tab 21, and may be welded, and a first included angle is formed between a surface of the first connecting member 31 connected to the first connecting plate 51 and a surface of the fourth connecting plate 54 connected to the first tab 21, where the first included angle ranges from 80 ° to 120 °, such as 80 °, 90 °, 100 °, 110 °, 120 °, and the like, that is, a surface of the first connecting member 31 connected to the first connecting plate 51 and a surface of the fourth connecting plate 54 connected to the first tab 21 are not parallel, such as perpendicular. Therefore, the connection surface of the first connecting piece 31 and the first connecting piece 51 and the connection surface of the fourth connecting piece 54 and the first tab 21 are staggered, so that the two connection surfaces are basically arranged along the width direction of the battery cell, the occupation space of the first connecting piece 31 and the first connecting piece 51 in the cavity can be reduced, meanwhile, the connection of the first connecting piece 31 and the first connecting piece 51 and the connection of the fourth connecting piece 54 and the first tab 21 are not interfered with each other, the stability of the first connecting piece 31 connected with the first tab 21 through the first connecting piece can be further improved, and the quality of the battery, such as stability, safety, service life and the like, can be further improved.
Furthermore, a second included angle is formed between the surface of the first connecting piece 31, which is connected to the first connecting piece 51, and the surface of the first connecting piece 31, which is connected to the first side plate 11 (the surface of the first connecting piece 31 facing the first side plate 11), and the second included angle is in the range of 80-120 °, for example, 80 °, 90 °, 100 °, 110 °, 120 °, i.e., the two are not parallel, for example, perpendicular.
In addition, the battery cell 2 includes a plurality of electrode plates stacked in layers, and a surface of the first connection piece 51, which is connected to the first adapter 31, may be parallel to a surface of the electrode plate.
In some embodiments, as shown in fig. 1 to 3, the first coupling member further includes a first connection assembly connected to the first connection piece 51 and the fourth connection piece 54, respectively, the first connection assembly includes a second connection piece 52 and a third connection piece 53, and the second connection piece 52 is located between the first coupling member 31 and the battery cell 2; in the direction from the first tab 21 to the first transition piece 31, the third connecting piece 53 is located between the first transition piece 31 and the first tab 21; the first connecting piece 51, the second connecting piece 52, the third connecting piece 53 and the fourth connecting piece 54 are connected in sequence.
Specifically, the first coupling member has a multiple-bending structure, the first connecting piece 51 is connected with the fourth connecting piece 54 sequentially through the second connecting piece 52 and the third connecting piece 53, the surface of the first connecting piece 51 is not parallel, for example, perpendicular, to the surface of the second connecting piece 52, but not parallel, and may be perpendicular or not, and the surface of the fourth connecting piece 54 may be parallel to the surface of the second connecting piece 52, thereby, by arranging the multiple-bending first connecting piece 51, second connecting piece 52, third connecting piece 53 and fourth connecting piece 54, the first coupling member is prevented from swinging in the left-right direction and the front-back direction, and the stability of connection between the first coupling member 31 and the first tab 21 can be further improved.
In other embodiments, as shown in fig. 15, the first connecting piece 51 includes a first connecting portion 511 connected to the first connecting member 31, and a second connecting portion 512 extending along the extending direction of the first side plate 11 (e.g., the direction from the first connecting member 31 to the first tab 21), and the second connecting portion 512 is connected to the fourth connecting piece 54.
The first connection portion 511 and the second connection portion 512 are located on the same side of the first adaptor 31 and also located on the same side of the first tab 21, the first connection portion 511 may specifically be located on a side of the first adaptor 31 departing from the sixth side plate 16 (a side facing the fifth side plate 15), and the second connection portion 512 may specifically be located on a side of the first tab 21 departing from the sixth side plate 16. The included angle formed between the surface of the second connecting portion 512 facing the first tab 21 and the surface of the fourth connecting piece 54 contacting the first tab 21 may range from 80 ° to 120 °, such as 80 °, 90 °, 100 °, 110 °, 120 °, i.e. they are not parallel, such as perpendicular.
Specifically, the first connection portion 511 and the second connection portion 512 may be integrally formed to form the first connection piece 51, and the surfaces of the first connection portion 511 and the second connection portion 512 may be substantially flush, that is, the first connection piece 51 may be a straight structure without being bent to a large degree, but is not limited thereto. The surface of the first connecting piece 51 is not parallel, e.g. perpendicular, to the surface of the fourth connecting piece 54.
Furthermore, the first connecting piece 51 and the first connecting piece 31 may be welded, and a weld is formed on a side of the first connecting piece 51 facing away from the first connecting piece 31. When the first connecting portion 51 includes the first connecting portion 511 and the second connecting portion 512, the first connecting portion 511 and the first connecting member 31 may be welded, and a welding seal is formed on a side of the first connecting portion 511 facing away from the first connecting member 31. Specifically, there is an overlapping region where the projection of the first junction piece 31 in the thickness direction of the battery cell 2 and the projection of the first connection piece 51 in the thickness direction of the battery cell 2 overlap, and the welding region of the two is located in the overlapping region.
As shown in fig. 1 to 11, a third groove 300 is disposed on a side of the first adapter 31 away from the first side plate 11, the third groove 300 is respectively communicated with the second through hole 310 and the cavity, the first through hole 100, the second through hole 310, the third groove 300 and the cavity are sequentially communicated, so that the first through hole 100 is communicated with the cavity, and the third groove 300 can be used as an electrolyte circulation groove for facilitating the injection of electrolyte.
As shown in fig. 11, in some embodiments, a cross section of the third groove 300 parallel to a direction from a side of the first adaptor 31 facing the first side plate 11 to a side of the first adaptor 31 facing away from the first side plate 11 is arc-shaped, for example, semicircular (the first adaptor 31 is in an arch structure), so that, in a depth direction of the third groove 300, a thickness of a sidewall (such as a second adaptor 312 described below) surrounding the third groove 300 is gradually increased (i.e., the thickness of the sidewall at the periphery of the third groove 300 is larger as the side wall is closer to the inside of the third groove 300), thereby facilitating welding of the first adaptor 31 with the first side plate 11 and the first connecting tab 51, respectively, avoiding large deformation of the first adaptor 31 with the first connecting tab 51 during welding and the like, which affects stability of the connecting structure, and thus improving yield and performance of manufacturing of the battery.
The thickness of the thinnest portion of the first adapter 31 (the minimum thickness of the side wall surrounding the third groove 300) may be 0.2mm to 1mm, such as 0.2mm, 0.5mm, 0.8mm, 1mm, and the like, and the thickness of the thinnest portion is the thickness along the side facing the third groove 300 to the side facing away from the third groove 300.
Specifically, as shown in fig. 11, the minimum thickness of the first adaptor 31 in the direction from the first side plate 11 to the first adaptor 31 is 0.2mm to 1mm, such as 0.2mm, 0.5mm, 0.8mm, 1mm, etc.; the minimum thickness of the first connecting member 31 in the thickness direction of the battery cell 2 is 0.2mm to 1mm, for example, 0.2mm, 0.5mm, 0.8mm, 1mm, and the like.
As shown in fig. 11, the third groove 300 penetrates through the first connecting member 31 along the length direction of the first connecting member 31, that is, the axial direction of the third groove 300 is the same as the length direction of the first connecting member 31, and the surface of the first connecting member 31 contacting the first connecting piece 51 and the surface of the first connecting member 31 contacting the first side plate 11 are respectively parallel to the length direction of the first connecting member 31. In addition, an axial direction of the third groove 300 and an axial direction of the second through hole 310 may be perpendicular.
Specifically, as shown in fig. 11, the first adapter 31 has a first adapter 311, one end of the first adapter 311 on the side away from the first side plate 11 extends outward to form a second adapter 312, and the second adapter 312 and the first adapter 311 enclose a third groove 300, or the other end of the first adapter 311 on the side away from the first side plate extends outward to form a third adapter 313, and the third adapter 313, the first adapter 311, and the second adapter 312 enclose a third groove 300. The first transition portion 311, the second transition portion 312, the third transition portion 313 and the third groove 300 have the same length direction (i.e. the axial direction of the third groove 300) and length. In a direction approaching to the first adapting portion 311, the thickness of the second adapting portion 312 and the thickness of the third adapting portion 313 are gradually increased, so that the cross section of the third groove 300 is arc-shaped, specifically, a surface of the second adapting portion 312 departing from the first adapting portion 311 and a surface of the third adapting portion 313 departing from the first adapting portion 311 are substantially on the same plane, so that the cross section of the third groove 300 is semicircular.
Specifically, the first adapter 31 may be integrally formed, for example, by bending a sheet metal part, or formed by powder metallurgy.
In other embodiments, as shown in fig. 6 to 10, the first adapter 31 includes a first adapter 311 and a second adapter 312 enclosing the third groove 300, the second through hole 310 is disposed on the first adapter 311, the first adapter 311 is connected to the first side plate 11, the first coupling member is connected to the second adapter 312, specifically, the first connecting tab 51 of the first coupling member is connected to a side of the second adapter 312 away from the third groove 300, so that the first adapter 31 is connected to the first tab 21 through the first coupling member.
As shown in fig. 7 to 10, an included angle is formed between the first adapter 311 and the second adapter 312, and the included angle is, for example, not greater than 90 ° (i.e., an included angle of not greater than 90 ° is formed between two surfaces or planes), and one or more reinforcing ribs 315 are disposed between the second adapter 312 and the first adapter 311. Specifically, the reinforcing rib 315 is located in the third groove 300, specifically located at an included angle between the first adapting portion 311 and the second adapting portion 312, and one end of the reinforcing rib is connected to the first adapting portion 311, and the other end of the reinforcing rib is connected to the second adapting portion 312, so as to support the first adapting portion 311 and the second adapting portion 312, improve the structural stability of the first adapting member 31, and avoid the phenomena of deformation and the like in the welding process of the second adapting portion 312.
As shown in fig. 7 to 10, the joint portion of the second adapter portion 312 and the first adapter portion 311 has a reinforcing region 314 corresponding to the position of the reinforcing rib 315, the reinforcing region 314 is recessed toward the included angle direction (the direction facing the third groove 300) between the second adapter portion 312 and the first adapter portion 311, and forms the reinforcing rib 315, that is, in the reinforcing region 314, the outer side (the side facing away from the third groove 300/the side facing the first side plate 11) of the joint portion of the second adapter portion 312 and the first adapter portion 311 is recessed to form a fourth groove, the fourth groove has two opposite side walls, and a bottom wall (i.e., the reinforcing rib 315) located between the two side walls, one side wall is connected to the first adapter portion 311 and extends from the side where it is connected to the first adapter portion 311 to the bottom wall, the other side wall is connected to the second adapter portion 312 and extends from the side where it is connected to the second adapter portion 312 to the bottom wall, the cross-sectional shape of the fourth groove side wall is, for example, triangular.
Specifically, the rib 315 may be formed by stamping a reinforcing region, that is, stamping from the outside of the contact portion between the second adapter portion 312 and the first adapter portion 311, so as to be recessed toward the included angle between the first adapter portion 311 and the second adapter portion 312, thereby forming the rib 315.
As shown in fig. 7 to 10, an angle (fifth angle α 1) between a line between one end of the rib 315 contacting the first transition portion 311 and one end of the rib 315 contacting the second transition portion 312 and a surface of the first transition portion 311 (a surface of the first transition portion contacting the rib 315) is 30 ° to 60 °, for example, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, or the like, and an angle (sixth angle α) between a line between one end of the rib 315 contacting the first transition portion 311 and one end of the rib 315 contacting the second transition portion 312 and a surface of the second transition portion 312 (a surface of the rib 315) is 30 ° to 60 °2) Is 30-60 deg., such as 30 deg., 35 deg., 40 deg., 45 deg., 50 deg., 55 deg., 60 deg., etc.
Illustratively, one surface of the rib 315 located in the third groove 300 is an inclined surface (one end of the inclined surface is connected to the first transition portion 311, and the other end is connected to the second transition portion 312), so that an included angle between the inclined surface and the surface of the first transition portion 311 connected to the rib 315 is 30-60 °, and an included angle between the inclined surface and the surface of the second transition portion 312 connected to the rib 315 is 30-60 °.
As shown in fig. 6 to 10, the first adapting member 31 further includes a third adapting portion 313 connected to the first adapting portion 311, the third adapting portion 313 and the second adapting portion 312 are respectively located at two opposite sides of the first adapting portion 311, that is, the third adapting portion 313, the first adapting portion 311, and the second adapting portion 312 are sequentially connected to form a third groove 300, the first adapting portion 311 forms a bottom wall of the third groove 300, the second adapting portion 312, and the third adapting portion 313 respectively form a side wall of the third groove 300, and an opening of the third groove 300 away from the first adapting portion 311 faces the cavity/electric core 2.
One side of the second adapter portion 312 is connected to one side of the first adapter portion 311, the other side of the second adapter portion 312 extends outward along the thickness direction of the first adapter portion 311 (the direction in which the first adapter portion 311 deviates from the first side plate), one side of the third adapter portion 313 is connected to the other side of the first adapter portion 311, the other side of the third adapter portion 313 extends outward along the thickness direction of the first adapter portion 311, the length directions and lengths of the first adapter portion 311, the second adapter portion 312 and the third adapter portion 313 may be the same, the width directions and widths of the second adapter portion 312 and the third adapter portion 313 may be the same, and the width direction thereof is the same as the thickness direction of the first adapter portion 311.
The second through hole 310 may be disposed in the middle of the first transition portion 311, and does not extend to the second transition portion 312 and the third transition portion 313, and the distance from the second through hole 310 to the second transition portion 312 and the distance from the second through hole 310 to the third transition portion may be equal or different, preferably equal.
Specifically, in a projection of the first transfer portion 311 perpendicular to the axial direction of the second through hole 310, the center of the second through hole 310 is the center point of the first transfer portion 311. Exemplarily, as shown in fig. 1 to 11, a projection of the first transfer part 311 perpendicular to the axial direction of the second transfer part 310 is a substantially regular quadrangle, the first transfer part 311 has first and third opposite sides and second and fourth opposite sides, a direction of the first to third sides and a direction of the second to fourth sides are perpendicular to the axial direction of the second transfer part 310, the direction of the first to third sides and the direction of the second to fourth sides may be perpendicular to each other, a distance from the second transfer part 310 to the first side of the first transfer part 311 is substantially equal to a distance from the second transfer part 310 to the third side of the first transfer part 311, and a distance from the second transfer part 310 to the second side of the first transfer part 311 is substantially equal to a distance from the second transfer part 310 to the fourth side of the first transfer part 311. Illustratively, the second transition portion 312 meets a first side of the first transition portion 311, and the third transition portion 313 meets a third side of the first transition portion 311.
Specifically, the second transition portion 312 may be located on a side of the first transition portion 311 facing the fifth side plate 15, and the third transition portion 313 is located on a side of the first transition portion 311 facing the sixth side plate 16.
Generally, the axial direction of the first through hole 100 is the same as the thickness direction of the first side plate 11, and the axial direction of the second through hole 310 is the same as the thickness direction of the first transfer portion 311.
In the embodiment of the present invention, a surface of the first adapter 31 contacting the first connecting piece 51 (a surface of the first connecting piece 51 contacting the first adapter 31) is a surface of the second adapter 312 contacting the first connecting piece 51, and a surface of the first adapter 31 contacting the first side plate 11 (a surface of the first adapter 31 facing the first side plate 11) is a surface of the first adapter 311 contacting the first side plate 11 (a surface of the first adapter 311 facing the first side plate 11).
Specifically, the first connecting piece 51 and the second adapter 312 may be welded, and a welding mark is formed on a side of the first connecting piece 51 facing away from the second adapter 312. When the first connecting piece 51 includes the first connecting portion 511 and the second connecting portion 512, the first connecting portion 511 and the second adapter portion 312 may be welded, and a welding seal is formed on a side of the first connecting portion 511 away from the second adapter portion 312. Specifically, there is an overlapping region where a projection of the second adapter portion 312 in the thickness direction of the battery cell 2 and a projection of the first connection piece 51 in the thickness direction of the battery cell 2 overlap, and a welding region of the two is located in the overlapping region.
In some embodiments, a projection of the first conversion member 31 on the first side plate 11 is not overlapped with a projection of the first tab 21 on the first side plate 11 (that is, a projection of the first conversion member 31 parallel to the extending direction of the first side plate 11 is not overlapped with a projection of the first tab 21 parallel to the extending direction of the first side plate 11), so that the first tab 21 and the first conversion member 31 are not distributed along the direction from the electric core 2 to the first side plate 11, specifically, the distance from the first side plate 11 to the electric core 2 is a in the direction from the first side plate 11 to the electric core 21The distance from the side of the first tab 21 connected to the battery cell 2 to the side of the first tab 21 departing from the battery cell 2 (i.e., the side facing the first side plate 11) is b1A length of the first adapter 31 from a side of the first adapter 31 facing the electric core 2 (i.e., a side facing away from the first side plate 11) to a side of the first adapter 31 facing the first side plate 11 (i.e., a length of the first adapter 31 in a direction from the first side plate 11 to the electric core 2) is c1，a1＜b1+c1From this, compare in the mode that utmost point ear and adaptor arranged along the length direction of casing, the technical scheme of this embodiment can make the space between electric core and the first curb plate obtain abundant utilization, can practice thrift the cavity space to can increase the size of electric core, improve the energy density of battery.
In addition, the housing 1 includes a second side plate 12 connected to the first side plate 11, a projection of the first adaptor 31 on the second side plate 12 is at least partially overlapped with a projection of the first tab 21 on the second side plate 12 (i.e., a projection of the first adaptor 31 perpendicular to the extending direction of the first side plate 11 is at least partially overlapped with a projection of the first tab 21 perpendicular to the extending direction of the first side plate 11), that is, the first adaptor 31 and the first tab 21 are distributed along the extending direction of the first side plate 11, thereby facilitating the connection between the first tab 21 and the first adaptor 31, and further saving the cavity space.
Specifically, the surface of the second side plate 12 may be perpendicular to the surface of the first side plate 11, the electric core 2 may include a plurality of electrode sheets stacked in layers, the surface of the second side plate 12 is perpendicular to the surface of the electrode sheets (parallel to the thickness direction of the electrode sheets), and the surface of the first side plate 11 is perpendicular to the surface of the electrode sheets.
In some specific embodiments, as shown in fig. 1 and 16, a projection of the first adapter 31 perpendicular to the width direction of the battery cell 2 at least partially overlaps a projection of the first tab 21 perpendicular to the width direction of the battery cell 2, that is, the first adapter 31 and the first tab 21 are distributed along the width direction of the battery cell 2.
Specifically, the extending direction of the first side plate 11 is parallel to the surface of the first side plate 11, the direction from the first side plate 11 to the electric core 2 may be parallel to the length direction of the casing 1, and the extending direction of the first side plate 11 may be the width direction of the casing 1 or the thickness direction of the casing 1. Exemplarily, as shown in fig. 1 to 5, the extending direction of the first side plate 11 is the width direction of the housing 1.
In general, the longitudinal direction of the casing 1 is also the longitudinal direction of the cell 2, the width direction of the casing 1 is also the width direction of the cell 2, and the thickness direction of the casing 1 is also the thickness direction of the cell 2. In addition, the battery cell 2 may include a plurality of electrode sheets stacked in a thickness direction of the battery cell 2, that is, the thickness direction of the battery cell 2 is also the thickness direction of the electrode sheets.
As shown in fig. 1, a sixth insulating layer 86 is further provided on a side of the first connecting piece 51 (or the first connecting portion 511 of the first connecting piece 51) facing away from the first adapter 31/the second adapter 312.
As shown in fig. 1, 15 and 16, the battery may further include a third insulation layer 83, and the third insulation layer 83 is located between the first joint member 5 and the first side plate 11. In particular, the third insulation layer 83 may comprise a first portion on the side of the fourth connecting piece 54 facing away from the first tab 21.
In some embodiments, the battery cell 2 includes a plurality of electrode sheets stacked together, the battery cell 2 has a first side and a second side opposite to each other, and the third insulating layer 83 further includes a second portion formed by extending from an end of the first portion close to the first side of the battery cell 2 to a direction close to the battery cell 2, and a third portion formed by extending from an end of the first portion close to the second side of the battery cell 2 to a direction close to the battery cell 2.
As shown in fig. 1, 15 and 16, the second portion, the first portion and the third portion of the third insulating layer 83 are sequentially connected, and is enclosed into a first groove, the bottom wall of the first groove is a first part of the third insulation layer 83, the side walls are a second part and a third part of the third insulation layer 83, respectively, the first tab 21 and the part of the first coupling member connected with the first tab 21 (such as the fourth connecting piece 54 and the second connecting part 512 of the first connecting piece 51 on the side of the first tab 21) are positioned in the first groove and covered by the third insulation layer 83, thereby avoid first utmost point ear 21 or first connecting piece 51 and casing contact, play the effect of protection to first utmost point ear 21 and first connecting piece simultaneously, prevent that first utmost point ear 21 and first connecting piece from falling the in-process and taking place to collide with the casing at the battery, from this, can further improve the performance such as stability and the security of battery.
Specifically, the first tab 21 has a first side surface and a second side surface which are opposite to each other, and the first side surface of the first tab 21 and the second side surface of the first tab 21 are respectively located on two opposite sides of a surface (i.e., a surface of the first tab 21 facing away from the battery cell 2) where the first tab 21 is connected to the fourth connecting piece 54. When the first connecting piece 51 and the fourth connecting piece 54 are connected by the first connecting assembly (i.e., the second connecting piece 52 and the third connecting piece 53) (as shown in fig. 1 to 3), the third insulating layer 83 includes a first portion located on a side of the fourth connecting piece 54 facing away from the first tab 21, a second portion located on a first side of the first tab 21, and a third portion located on a second side of the first tab 21; when the first connecting piece 51 of the first coupling member includes the first connecting portion 511 and the second connecting portion 512 (as shown in fig. 15), the second connecting portion 512 extends to the first side of the first tab 21, and the third insulation layer 83 includes a first portion on a side of the fourth connecting piece 54 facing away from the first tab 21, a second portion on a side of the second connecting portion 512 facing away from the first tab 21, and a third portion on a side (second side) of the first tab 21 facing away from the second connecting portion 512.
In some embodiments, a projection of the first tab 21 in the thickness direction of the battery cell 2 is located in a projection of the second portion of the third insulating layer 83 in the thickness direction of the battery cell 2, a projection of the first tab 21 in the thickness direction of the battery cell 2 is located in a projection of the third portion of the third insulating layer 83 in the thickness direction of the battery cell 2, and a projection of the first tab 21 in the length direction of the battery cell 2 is located in a projection of the first portion of the third insulating layer 83 in the length direction of the battery cell 2, that is, the third insulating layer 83 completely covers the first tab 21 and a portion where the first coupling member meets the first tab 21. The direction from the second portion to the first tab 21, the direction from the third portion to the first tab 21, the direction from the second portion to the third portion, and the thickness direction of the battery cell 2 may be parallel, and the direction from the first portion to the first tab 21 is parallel to the length direction of the battery cell 2.
In some preferred embodiments, a second portion of the third insulating layer 83 extends to the first side of the battery cell 2 and is adhered to an electrode sheet (an electrode sheet close to the casing 1) located on the first side of the battery cell 2, and a third portion of the third insulating layer 83 extends to the second side of the battery cell 2 and is adhered to an electrode sheet (an electrode sheet close to the casing 1) located on the second side of the battery cell 2, so that the third insulating layer 83 is wrapped on the side of the battery cell 2, and the stability of the battery cell 2 can be further improved.
As shown in fig. 1 and 16, a second insulating layer 82 may be further disposed between the first junction member 31 and the battery cell 2 to prevent the first junction member 31 from contacting and shorting with electrode pads of opposite polarity in the battery cell 2. Specifically, when the first coupling member 31 has the second connection piece 52, the second insulating layer 82 is located between the second connection piece 52 and the battery cell 2.
In some embodiments, as shown in fig. 1 and fig. 16, the second insulating layer 82 extends to the first surface of the battery cell 2 and is bonded to the electrode sheet located on the first surface of the battery cell 2, and the second insulating layer 82 extends to the second surface of the battery cell 2 and is bonded to the electrode sheet located on the second surface of the battery cell 2, so that the second insulating layer 82 wraps the side surface of the battery cell 2 and can also fix the battery cell 2, thereby improving the stability of the battery cell 2.
In some embodiments, the battery cell 2 includes a plurality of electrode plates stacked one on another, where each electrode plate includes a first electrode plate including a first current collector, and the first tab 21 is disposed on the first current collector; along the direction of first adaptor 31 to electricity core 2, the distance between first adaptor 31 and the first mass flow body is less than 1 millimeter, and first adaptor 31 is less than 1 millimeter with the first mass flow body distance in the direction from first adaptor 31 to electricity core 2 promptly to further shorten the shared space of first adaptor 31 and first utmost point ear 21, improve the space utilization of cavity, enlarge the area occupied of electrode slice, strengthen the energy density of electricity core.
In some embodiments, a distance from one side of the first tab 21 away from the battery cell 2 to one side of the first tab 21 connected to the battery cell 2 is not greater than a length of the first adapter 31 along a direction from the first side plate 11 to the first tab 21 (i.e., a length of the first adapter 31 along a direction from the first side plate 11 to the first tab 21), that is, an overlapping region between a projection of the first adapter 31 on the second side plate 12 and a projection of the first tab 21 on the second side plate 12 is increased, so that protection of the first tab 21 in a width direction of the battery cell is achieved, the first tab 21 is prevented from falling off in a falling or collision process of the battery, meanwhile, an area of an electrode sheet of the battery cell can be further enlarged, and performance such as battery energy density is further improved.
In some embodiments, the length c1 of the first adapter 31 in the direction from the first side plate 11 to the first tab 21 is 1mm-4mm, such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.
In addition, the battery cell 2 is further provided with a second tab 22, and the polarity of the second tab 22 is opposite to that of the first tab 21; the battery further comprises a second adaptor 32, the second adaptor 32 is electrically connected with the second lug 22, the second adaptor 32 is disposed between the first side plate 11 and the battery cell 2, and a projection of the second adaptor 32 on the first side plate 11 is not overlapped with a projection of the second lug 22 on the first side plate 11 (i.e., a projection of the second adaptor 32 parallel to the extending direction of the first side plate 11 is not overlapped with a projection of the second lug 22 parallel to the extending direction of the first side plate 11).
Therefore, the second lugs 22 and the second adaptor 32 are not distributed along the direction from the electric core 2 to the first side plate 11, specifically, the distance from the first side plate 11 to the electric core 2 is a along the direction from the first side plate 11 to the electric core 21The distance from the side of the second tab 22 connected to the battery cell 2 to the side of the second tab 22 away from the battery cell 2 (i.e. the side facing the first side plate 11) is b2The second adaptor 32 faces the electric core 2 (i.e. the side facing away from the first side plate 11) to the side of the second adaptor 32 facing the first side plate 11 (i.e. the second adaptor 32 is located along the first side)Length of plate 11 in the direction of cell 2) is c2，a1＜b2+c2Therefore, the cavity space can be further saved, and the energy density and other performances of the battery can be improved.
Wherein, b2And b1May be equal or different, c2And c1May be equal or different.
Specifically, the projections of the first tab 21, the second tab 22, the first adaptor 31 and the second adaptor 32 on the first side plate are not overlapped with each other.
As shown in fig. 11 and 16, a projection of the second adaptor 32 on the second side plate 12 is at least partially overlapped with a projection of the second pole ear 22 on the second side plate 12 (that is, a projection of the second adaptor 32 perpendicular to the extending direction of the first side plate 11 is at least partially overlapped with a projection of the second pole ear 22 perpendicular to the extending direction of the first side plate 11), that is, the second adaptor 32 and the second pole ear 22 are arranged along the extending direction of the first side plate, and may be specifically arranged in the width direction of the battery cell, thereby facilitating the connection between the second adaptor 32 and the second pole ear 22, further saving the cavity space, and improving the energy density and other performances of the battery.
Furthermore, the projection of the first tab 21 on the second side plate 12 at least partially overlaps the projection of the second tab 22 on the second side plate 12 (i.e. the projection of the first tab 21 perpendicular to the extension direction of the first side plate 11 at least partially overlaps the projection of the second tab 22 perpendicular to the extension direction of the first side plate 11). The projection of the first adapter 31 on the second side plate 12 at least partially overlaps the projection of the second adapter 32 on the second side plate 12.
Specifically, as shown in fig. 1 and fig. 16, a projection of the first tab 21 perpendicular to the width direction of the battery cell 2 at least partially overlaps a projection of the second tab 22 perpendicular to the width direction of the battery cell 2, and a projection of the second adaptor 32 perpendicular to the width direction of the battery cell 2 at least partially overlaps a projection of the second tab 22 perpendicular to the width direction of the battery cell 2.
In addition, the first tab 21 and the second tab 22 may be located between the first adaptor 31 and the second adaptor 32, so that a space between the first adaptor 31 and the second adaptor 32 is fully utilized, and the size of the electrode plate of the battery cell 2 in the length direction is further enlarged to improve the energy density of the battery cell. For example, in a direction parallel to the first tab 21 from the first adapter 31, the first tab 21 and the second tab 22 are located between the first adapter 31 and the second adapter 32, that is, the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 may be arranged in sequence, for example, the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 may be arranged in sequence in the width direction of the battery cell 2, and the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 may be arranged substantially coaxially.
But not limited thereto, in other embodiments, it is also possible that the first adaptor 31 and the second adaptor 32 are located between the first tab 21 and the second tab 22.
In addition, the first adaptor 31, the first tab 21, the second tab 22, and the second adaptor 32 do not generally protrude beyond the outer edge of the end surface of the electrical core 2 (the end surface of the electrical core 2 facing the first side plate 11), and do not protrude beyond the outer edge of the electrical core 2 in the thickness direction or the width direction of the electrical core 2, that is, the projection of the electrical core 2 on the first side plate 11 covers the projection of the first adaptor 31 on the first side plate 11, the projection of the electrical core 2 on the first side plate 11 covers the projection of the first tab 21 on the first side plate 11, the projection of the electrical core 2 on the first side plate 11 covers the projection of the second tab 22 on the first side plate 11, and the projection of the electrical core 2 on the first side plate 11 covers the projection of the second adaptor 32 on the first side plate 11.
As shown in fig. 1 to 5, the battery further includes an external connection sheet 41 disposed on a side of the first side plate 11 of the housing 1 away from the cavity, the external connection sheet 41 includes a pole 42 protruding outwards, and the pole 42 penetrates through the first side plate 11 and is connected with the second adaptor. The pole 42 is generally formed by protruding outward along the thickness direction of the external tab 41, i.e. the axial direction of the pole 42 is parallel to the thickness direction of the external tab 41.
Specifically, the first side plate 11 is provided with a fifth through hole 110 disposed corresponding to the pole 42, and the pole 42 passes through the fifth through hole 110 to penetrate through the first side plate 11 and be connected with the second adaptor 32.
In addition, the second adaptor 32 includes a third through hole 320 disposed corresponding to the pole 42, the pole 42 penetrates through the first side plate 11 and is connected to the second adaptor 32 through the third through hole 320, and the fifth through hole 110 and the third through hole 320 may be disposed coaxially.
In general, the cross section of the pole 42 perpendicular to the axial direction of the pole 42 is circular, and as shown in fig. 12, the pole 2 may be cylindrical; alternatively, as shown in fig. 13, the pole has a conical structure, that is, the diameter of the pole 42 tends to increase or decrease along a direction away from the outer contact piece 41 (a direction from the first side plate 11 to the second adaptor 32), and the diameter of the pole 42 is the diameter of a cross section of the pole 42 perpendicular to the axial direction of the pole 42.
Specifically, when the pole 42 is of a conical structure, the diameter of the pole 42 tends to change (i.e., increase or decrease) in a direction from the first side plate 11 to the second adaptor 32, and the change may be gradual, i.e., increase or decrease uniformly with substantially the same magnitude. The aperture (diameter) of the fifth through hole 110 and the third through hole 320 changes with the diameter of the pole 42, for example, the diameter of the pole 42 gradually increases along the direction from the first side plate 11 to the second adaptor 32, and at this time, the aperture of the fifth through hole 110 and the third through hole 320 also gradually increases; in the direction from the first side plate 11 to the second adaptor 32, the diameter of the pole 42 gradually decreases, and at this time, the hole diameters of the fifth through hole 110 and the third through hole 320 also gradually decrease.
In some embodiments, as shown in fig. 12 and 13, the third through hole 320 of the second adaptor 32 includes a first hole section and a second hole section connected to each other, and the second hole section is located on a side of the first hole section close to the battery cell 2; one end of the pole column 42 close to the electric core 2 extends outwards to form an extending part 43 corresponding to the second hole section.
Specifically, the first hole section and the second hole section may be coaxially disposed, the first hole section and the second hole section are both circular through holes, the diameter of the second hole section is greater than the diameter of the end of the first hole section connected to the second hole section, preferably, the diameter of the second hole section is greater than the diameter of the first hole section, and the axial projection of the second hole section perpendicular to the third through hole 320 may cover the axial projection of the first hole section perpendicular to the third through hole 320.
In addition, the cross-sectional area of the external tab 41 perpendicular to the axial direction of the pole post 42 may be larger than the cross-sectional area of the pole post 42 perpendicular to the axial direction of the pole post 42, the projection of the external tab 41 perpendicular to the axial direction of the pole post 42 covers the projection of the pole post 42 perpendicular to the axial direction of the pole post 42, the cross-sectional area of the external tab 43 perpendicular to the axial direction of the pole post 42 is larger than the cross-sectional area of the pole post 42 perpendicular to the axial direction of the pole post 42, the projection of the external tab 41 perpendicular to the axial direction of the pole post 42 covers the projection of the pole post 42 perpendicular to the axial direction of the pole post 42, the cross-sectional area of the external tab 41 perpendicular to the axial direction of the pole post 42 is larger than the cross-sectional area of the external tab 43 perpendicular to the axial direction of the pole post 42, the cross-sectional area of the external tab 43 perpendicular to the axial direction of the pole post 42 is substantially equal to the cross-sectional area of the second hole section perpendicular to the axial direction of the pole post 42, the extension 43 is engaged with the second hole section and contacts with the sidewall of the second hole section.
As shown in fig. 12 and 13, an end surface of the terminal 42 close to the battery cell 2 may be flush with a side surface of the second adaptor 32 close to the battery cell 2, which may not only ensure the bonding strength between the terminal 42 and the second adaptor 32, but also prevent the terminal 42 from interfering with the connection between the second terminal lug 22 or the fifth connecting plate 55 and the second adaptor 32. Specifically, the thickness of the outer extension portion 43 in the axial direction of the third through hole 320 (also in the axial direction of the pole 42) is substantially equal to the depth of the second hole section in the axial direction of the third through hole 320, so that the outer extension portion 43 is fastened in the second hole section, and an end surface of the outer extension portion 43 close to the electric core 2 is flush with a side surface of the second adaptor 32 facing the electric core 2.
In addition, one end of the pole 42 close to the battery cell 2 may also extend out of the third through hole 320, and an outer extension portion 43 connected to a side surface of the second adaptor 32 close to the battery cell 2 is formed by extending outward along the circumferential direction of the third through hole 320, that is, one end surface of the pole 42 close to the battery cell 2 is not flush with a side surface of the second adaptor 32 facing the battery cell 2, but is located between the second adaptor 32 and the battery cell 2.
Wherein, epitaxial wafer, utmost point post 42, extension portion 43 can integrated into one piece, and it can be the metal material, during the concrete implementation, can make second adaptor 32 rivet through the rivet with first curb plate 11, and after the riveting, the rivet is located the one end that first curb plate 11 deviates from the cavity and forms outer splicing 41, and the other end forms extension portion 43, and the part between its both ends forms utmost point post 42, and the utmost point post 42 that forms is the toper structure for example.
The second pole piece 22 is generally insulated from the housing 1, and specifically, may be insulated by providing an insulating sheet (insulating layer). In some embodiments, as shown in fig. 1 to 5 and 12 to 14, a first insulating sheet 6 is further disposed between the external sheet 41 and the first side plate 11, and a second insulating sheet 7 is further disposed between the second adaptor 32 and the first side plate 11, that is, the external sheet 41, the first insulating sheet 6, the first side plate 11, the second insulating sheet 7, and the second adaptor 32 are sequentially stacked, and the pole 42 penetrates through the first insulating sheet 6 and the second insulating sheet 7; a first insulating layer 81 is disposed between the pole 42 and the first side plate 11, so that the external tab 41, the pole 42, the second adaptor 32 and the second pole ear 22 are electrically connected and are connected to the first side plate 11 (the housing 1) in an insulating manner.
In the circumferential direction of the third through hole 320, the difference between the aperture of the third through hole 320 and the diameter of the pole 42 is substantially equal to the width of the first insulating layer 81 in the circumferential direction of the third through hole 320, and the circumferential direction of the third through hole 320 is perpendicular to the axial direction of the third through hole 320. Specifically, the first insulating layer 81 may be integrally formed with the first insulating sheet 6, the first insulating layer 81 being formed by a side of the first insulating sheet 6 close to the first side plate 11 protruding outward (protruding inward of the second through hole 110); or the first insulating layer 81 may be integrally formed with the second insulating sheet 7, the first insulating layer 81 being formed by the second insulating sheet 7 protruding outward (protruding inward of the second through hole 110) on the side close to the first side plate 11.
Correspondingly, the first insulating sheet 6 is provided with a sixth through hole 60, and the pole 42 passes through the sixth through hole 60 to realize penetration of the first insulating sheet 6; the second insulating sheet 7 is provided with a fourth through hole 70, and the pole 42 passes through the fourth through hole 70 to realize penetration of the second insulating sheet 7. Specifically, the pole 42 sequentially passes through the sixth through hole 60, the fifth through hole 110, the fourth through hole 70, and the third through hole 320, so as to be connected to the second adaptor 32. The sixth through hole 60, the fifth through hole 110, the fourth through hole 70, and the third through hole 320 may be coaxially disposed.
As shown in fig. 1 to 5 and 12 to 14, the projection of the first insulating sheet 6 on the first side plate 11 may cover the projection of the outer connecting sheet 41 on the first side plate 11 (i.e. the projection of the outer connecting sheet 41 on the first side plate 11 is within the projection of the first insulating sheet 6 on the first side plate 11), so as to prevent the outer connecting sheet 41 from contacting the housing 1, and ensure the insulation of the housing. In addition, the projection coverage of the second insulation sheet 7 on the first side plate 11 can cover the projection of the second adaptor 32 on the first side plate 11 (namely, the projection of the second adaptor 32 on the first side plate 11 is in the projection of the second insulation sheet 7 on the first side plate 11), so as to prevent the second adaptor 32 from contacting with the housing 1, and ensure the insulation performance of the housing. This can further improve the safety, stability, and other properties of the battery.
As shown in fig. 13 and 14, the housing 1 further includes a sixth side plate 16 connected to the first side plate 11, the second insulating sheet 7 may be an L-shaped structure, and includes a first insulating portion 71 and a second insulating portion 72 connected to each other, the first insulating portion 71 is located between the second adaptor 32 and the first side plate 11, the terminal 42 penetrates through the first insulating portion 71 (the first insulating portion 71 is provided with a fourth through hole 70 corresponding to the terminal 42), and the second insulating portion 72 is located between the second adaptor 32 and the sixth side plate 16, so that, through the second insulating portion 72, a supporting and supporting function may be provided for the second adaptor 32, and the second adaptor 32 and the sixth side plate 16 of the housing 1 may be insulated from each other, thereby improving the safety, stability, and other performances of the battery.
The projection of the first insulating portion 71 on the first side plate 11 may cover the projection of the second adaptor 32 on the first side plate 11 (i.e., the projection of the second adaptor 32 on the first side plate 11 is in the projection of the first insulating portion 71 on the first side plate 11), and the projection of the second insulating portion 72 on the sixth side plate 16 may cover the projection of the second adaptor 32 on the sixth side plate 16 (i.e., the projection of the second adaptor 32 on the sixth side plate 16 is in the projection of the second insulating portion 72 on the sixth side plate 16), so as to prevent the second adaptor 32 from contacting the first side plate 11 or the sixth side plate 16.
An included angle is formed between a surface of the first insulating portion 71 contacting the second interposer 32 and a surface of the second insulating portion 72 contacting the second interposer 32, and the included angle ranges from 80 ° to 120 °, for example, 80 °, 90 °, 100 °, 110 °, 120 °, and the like. The surface of the sixth side plate 16 is parallel to the surface of the electrode sheet; the sixth side panel 16 is non-parallel, e.g. perpendicular, to the surface of the first side panel 11; the sixth side panel 16 is non-parallel, e.g., perpendicular, to the surface of the second side panel 12; the sixth side plate 16 may be, for example, a bottom side plate (or bottom plate).
In some embodiments, a distance from a side of the second electrode tab 22 facing away from the battery cell 2 to a side of the second electrode tab 22 connected to the battery cell 2 is not greater than a length of the second adaptor 32 in a direction from the first side plate 11 to the second electrode tab 22, which is beneficial to further improving performances of the battery, such as energy density and the like.
Specifically, the second adaptor 32 may be a block (or called a second adaptor block), and a thickness direction of the second adaptor 32 may be parallel to a direction from the first side plate 11 to the second pole ear 22, that is, a length of the second adaptor 32 along the direction from the first side plate 11 to the second pole ear 22 is a thickness of the second adaptor 32.
Generally, the direction from the first side plate 11 to the first tab 21, the direction from the first side plate 11 to the second tab 22, and the direction from the first side plate 11 to the electric core 2 are parallel.
In some embodiments, the length c of the second interposer 32 in the direction from the first side plate 11 to the second pole ear 222From 1mm to 3mm, for example 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.
Generally, the first tab 21 is electrically connected to the housing 1, the second tab 22 is connected to the housing 1 in an insulated manner, the second insulating sheet 7 may not be disposed between the first adaptor 31 and the first side plate 11, the two may be in direct contact, such as welding, and the second insulating sheet 7, c may be disposed between the second adaptor 32 and the first side plate 112＜c1The difference in thickness between the two (c)1-c2) May be substantially equal to the thickness of the second insulating sheet 7.
The battery may further include a second coupling member 5 'located between the electric core 2 and the first side plate 11, where the second coupling member 5' is connected to the second pole ear 22 and the second adaptor 32, respectively (i.e., the second adaptor 32 is connected to the second pole ear 22 through the second coupling member 5 '), and specifically, the second adaptor 32, the second coupling member 5', and the second pole ear 22 may be welded in sequence.
In particular, the second coupling part 5' may comprise a fifth connecting lug 55 connected to the second adapter part 32, and an eighth connecting lug 58 connected to a side of the second pole lug 22 facing away from the battery cell 2. As shown in fig. 1 to 3, 15 and 16, the second coupling member 5 ' may have a bent structure, the fifth connecting piece 55 is connected to the second adaptor 32, the eighth connecting piece 58 is connected to the second pole ear 22, and may be welded, a third included angle is formed between a surface of the second adaptor 32 connected to the fifth connecting piece 55 and a surface of the eighth connecting piece 58 connected to the second pole ear 22, and the third included angle ranges from 80 ° to 120 °, such as 80 °, 90 °, 100 °, 110 °, 120 °, that is, the third included angle is not parallel to the second connecting piece 5 ', such as perpendicular to the second connecting piece, so that the stability of the second adaptor 32 connected to the second pole ear 22 through the second coupling member 5 ' can be further improved, and the quality of the battery, such as stability, safety and service life, can be further improved.
Furthermore, a fourth angle is formed between a surface of the second adaptor 32, which is connected to the fifth connecting plate 55, and a surface of the second adaptor 32, which faces the first side plate 11, and the fourth angle is in a range of 80-120 °, for example, 80 °, 90 °, 100 °, 110 °, and 120 °, that is, the fourth angle and the fourth angle are not parallel, for example, may be perpendicular.
In addition, the battery cell 2 includes a plurality of electrode plates arranged in a stacked manner, and a surface of the fifth connecting piece 55, which is connected to the second adaptor 32, is parallel to a surface of the electrode plate.
In some embodiments, as shown in fig. 1 to 3, the second coupling member 5' further includes a second connection assembly connected to the fifth connection piece 55 and the eighth connection piece 58, respectively, the second connection assembly includes a sixth connection piece 56 and a seventh connection piece 57, and the sixth connection piece 56 is located between the second adaptor 32 and the battery core 2; in the direction from the second adapter 32 to the second pole lug 22, the seventh connection piece 57 is located between the second adapter 32 and the second pole lug 22; the fifth connecting piece 55, the sixth connecting piece 56, the seventh connecting piece 57 and the eighth connecting piece 58 are connected in sequence.
Specifically, the second coupling member 5' has a multiple-bending structure, the fifth connecting piece 55 sequentially passes through the sixth connecting piece 56 and the seventh connecting piece 57 to be connected with the eighth connecting piece 58, the surface of the fifth connecting piece 55 is not parallel, for example, perpendicular, to the surface of the sixth connecting piece 56, the surface of the sixth connecting piece 56 is not parallel, and may be perpendicular or not perpendicular, the surface of the eighth connecting piece 58 may be parallel to the surface of the sixth connecting piece 56, and thus, the connection stability of the second adaptor 32 and the second pole ear 22 may be further improved.
In other embodiments, as shown in fig. 15, the fifth connecting piece 55 includes a third connecting portion 551 connected to the second adaptor 32, and a fourth connecting portion 552 extending along the extending direction of the first side plate 11 (e.g., the direction from the second adaptor 32 to the second pole ear 22), and the fourth connecting portion 552 is connected to the eighth connecting piece 58. The third connecting portion 551 and the fourth connecting portion 552 are located on the same side of the second adaptor 32 and also located on the same side of the second pole lug 22, the third connecting portion 551 may be specifically located on a side of the second adaptor 32 away from the sixth side plate 16, the fourth connecting portion 552 may be specifically located on a side of the second pole lug 22 away from the sixth side plate 16, and a surface of the fourth connecting portion 552 facing the second pole lug 22 and a surface of the eighth connecting piece 58 connected to the second pole lug 22 are not parallel, for example, perpendicular.
Specifically, the third connecting portion 551 and the fourth connecting portion 552 may be integrally formed to form the fifth connecting piece 55, and the surfaces of the third connecting portion 551 and the fourth connecting portion 552 may be flush, that is, the fifth connecting piece 55 may be a straight structure without being bent to a large degree, but is not limited thereto. The surface of the fifth connecting piece 55 is not parallel, e.g. perpendicular, to the surface of the eighth connecting piece 58, i.e. the side of the fifth connecting piece 55 that meets the second adapter 32 and the side of the eighth connecting piece 58 that meets the second pole lug 22 are not parallel, e.g. perpendicular.
Furthermore, the fifth web 55 can be welded to the second adapter 32, and a weld impression can be formed on the side of the fifth web 55 facing away from the second adapter 32. When the fifth connecting piece 55 includes the third connecting portion 551 and the fourth connecting portion 552, the third connecting portion 551 and the second adaptor 32 may be welded, and a welding mark is formed on a side of the third connecting portion 551 facing away from the second adaptor 32. Specifically, there is an overlapping region between the projection of the second adaptor 32 in the thickness direction of the battery cell 2 and the projection of the fifth connecting piece 55 in the thickness direction of the battery cell 2, and the welding region of the two is located in the overlapping region.
In addition, a sixth insulating layer 86 is further disposed on a side of the fifth connecting piece 55 (or the third connecting portion 551 of the fifth connecting piece 55) facing away from the second adaptor 32, as shown in fig. 1, the sixth insulating layer 86 may extend from the first connecting piece 51 to the fifth connecting piece 55, and specifically may extend from an end of the first connecting piece 51 facing away from the fifth connecting piece 55 to an end of the fifth connecting piece 55 facing away from the first connecting piece 51, and cover the first connecting piece 51 and the fifth connecting piece 55.
Further, as shown in fig. 1, 15 and 16, a fourth insulation layer 84 may be included, the fourth insulation layer 84 being located between the second coupling member 5' and the first side plate 11. Specifically, the fourth insulating layer 84 may include a fourth portion on a side of the eighth connecting tab 58 facing away from the second pole ear 22.
In some embodiments, the fourth insulating layer 84 further includes a fifth portion formed by extending from one end of the fourth portion close to the first surface of the battery cell 2 to a direction close to the battery cell 2, and a sixth portion formed by extending from one end of the fourth portion close to the second surface of the battery cell 2 to a direction close to the battery cell 2.
As shown in fig. 1, 15 and 16, the fifth portion, the fourth portion and the sixth portion of the fourth insulating layer 84 are sequentially connected and are surrounded to form a second groove, the bottom wall of the second groove is the fourth portion of the fourth insulating layer 84, the side walls are the fifth portion and the sixth portion of the fourth insulating layer 84, respectively, and the second tab 22 and the portion of the second coupling member 5' connected to the second tab 22 (e.g., the eighth connecting piece 58 and the fourth connecting portion 552 of the fifth connecting piece 55 located on the side of the second tab 22) are located in the second groove and are covered by the fourth insulating layer 84, so that the stability, safety and other properties of the battery can be further improved.
Specifically, the second pole ear 22 has a first side surface and a second side surface opposite to each other, and the first side surface of the second pole ear 22 and the second side surface of the second pole ear 22 are respectively located on two opposite sides of a surface where the second pole ear 22 is connected to the eighth connecting pad 58. When the fifth and eighth connection tabs 55, 58 of the second coupling member 5' are connected by the second connection assembly (i.e., the sixth and seventh connection tabs 56, 57), the fourth insulation layer 84 includes a fourth portion on a side of the eighth connection tab 58 facing away from the second pole ear 22, a fifth portion on a first side of the second pole ear 22, and a sixth portion on a second side of the second pole ear 22; when the fifth connecting tab 55 of the second coupling member 5' includes the third connecting portion 551 and the fourth connecting portion 552, the fourth connecting portion 552 extends to the first side of the second pole ear 22, and the fourth insulating layer 84 includes a fourth portion on a side of the eighth connecting tab 58 facing away from the second pole ear 22, a fifth portion on a side of the fourth connecting portion 552 facing away from the second pole ear 22, and a sixth portion on a side (second side) of the second pole ear 22 facing away from the fourth connecting portion 552.
In some embodiments, a projection of the second pole ear 22 in the thickness direction of the battery cell 2 is located in a projection of the fifth portion of the fourth insulating layer 84 in the thickness direction of the battery cell 2, a projection of the second pole ear 22 in the thickness direction of the battery cell 2 is located in a projection of the sixth portion of the fourth insulating layer 84 in the thickness direction of the battery cell 2, and a projection of the second pole ear 22 in the length direction of the battery cell 2 is located in a projection of the fourth portion of the fourth insulating layer 84 in the length direction of the battery cell 2, that is, the fourth insulating layer 84 completely covers the second pole ear 22 and a portion where the second coupling member 5' meets the second pole ear 22. The direction from the fifth portion to the second pole ear 22, the direction from the sixth portion to the second pole ear 22, the direction from the fifth portion to the sixth portion, and the thickness direction of the battery cell 2 may be parallel, and the direction from the fourth portion to the second pole ear 22 is parallel to the length direction of the battery cell 2.
In some preferred embodiments, a fifth portion of the fourth insulating layer 84 extends to the first surface of the battery cell 2 and is bonded to an electrode sheet located on the first surface of the battery cell 2, and a sixth portion of the fourth insulating layer 84 extends to the second surface of the battery cell 2 and is bonded to an electrode sheet located on the second surface of the battery cell 2, so that the fourth insulating layer 84 is wrapped on the side surface of the battery cell 2, and the stability of the battery cell 2 can be further improved.
As shown in fig. 1 and 16, a fifth insulating layer 85 may be further disposed between the second adaptor 32 and the battery cell 2 to prevent the second adaptor 32 from contacting and shorting the electrode pads of the battery cell 2 with opposite polarities. In particular, when the second adaptor 32 has the sixth tab 56, the fifth insulating layer 85 is located between the sixth tab 56 of the second coupling member 5' and the battery cell 2.
In some embodiments, the fifth insulating layer 85 extends to the first surface of the electric core 2 and is bonded to the electrode plate located on the first surface of the electric core 2, and the fifth insulating layer 85 extends to the second surface of the electric core 2 and is bonded to the electrode plate located on the second surface of the electric core 2, so that the fifth insulating layer 85 wraps the side surface of the electric core 2 and can also fix the electric core 2, thereby improving the stability of the electric core 2.
In some embodiments, the battery cell 2 includes a plurality of electrode sheets arranged in a stack, where each electrode sheet includes a second electrode sheet including a second current collector, and the second electrode tab 22 is disposed on the second current collector; along the direction from the second adaptor 32 to the electric core 2, the distance between the second adaptor 32 and the second current collector is less than 1 millimeter, that is, the distance between the second adaptor 32 and the second current collector along the direction from the second adaptor 32 to the electric core 2 is less than 1 millimeter.
Generally, the direction from the second adaptor 32 to the battery cell 2, the direction from the first adaptor 31 to the battery cell 2, and the direction from the first side plate 11 to the battery cell 2 are parallel.
As shown in fig. 16, the battery cell 2 has a side surface between the first surface of the battery cell 2 and the second surface of the battery cell 2, and a protective adhesive layer 9 is provided on at least a partial region of at least one side surface of the battery cell 2.
Specifically, the side surface of the battery cell 2 is a side surface where the outer edge of the electrode sheet in the battery cell 2 is exposed, and is formed by end surfaces of a plurality of electrode sheets arranged in a stacked manner, which are perpendicular to the thickness direction of the battery cell 2, that is, the side surface of the battery cell 2 is parallel to the thickness direction of the battery cell 2 (also, the thickness direction of the electrode sheet).
The side surfaces of the battery cell 2 include a first side surface, a second side surface, a third side surface and a fourth side surface that are sequentially connected, the first side surface is a terminal surface of the battery cell 2 facing the first side plate 11 (i.e., a surface of the battery cell 2 provided with the first tab 21 and the second tab 22), the second side surface and the fourth side surface are located on two opposite sides of the first side surface (or the third side surface), and the first side surface and the third side surface are located on two opposite sides of the second side surface (or the fourth side surface). The first side surface and the third side surface may be parallel to each other, the second side surface and the fourth side surface may be parallel to each other, the first side surface (or the third side surface) and the second side surface (or the fourth side surface) may be perpendicular to each other, a direction from the first side surface to the third side surface may be a length direction of the battery cell 2, and a direction from the second side surface to the fourth side surface is a width direction of the battery cell 2, or a direction from the first side surface to the third side surface may also be a width direction of the battery cell 2, and a direction from the second side surface to the fourth side surface is a length direction of the battery cell 2.
At least one of the second side surface, the third side surface, and the fourth side surface is provided with the protective adhesive layer 9, that is, one or more (e.g., all) of the second side surface, the third side surface, and the fourth side surface are provided with the protective adhesive layer 9, but the invention is not limited thereto, and the first side surface may also be provided with the protective adhesive layer 9.
In addition, the number of the protective adhesive layers 9 on any one side of the battery core 2 may be one or more, and when the number of the protective adhesive layers 9 on any one side is 1, the length of the protective adhesive layers 9 on the side along the length direction of the side may not be greater than the length of the side, for example, substantially equal; when the number of the protection glue layers on any one side is multiple, the multiple protection glue layers 9 are arranged on the side of the battery core 2 at intervals, so that a gap exists between any two adjacent protection glue layers 9, electrolyte is favorably infiltrated into a pole piece in the battery core through the gap, and the performance of the battery is further optimized.
Taking the second side as an example, when the number of the protective adhesive layers 9 on the second side is one, the length of the protective adhesive layers 9 in the length direction of the second side may not be greater than the length of the second side, for example, substantially equal to the length of the second side; when the number of the protective adhesive layers 9 on the second side is plural, the plural protective adhesive layers 9 may be distributed at intervals on the second side.
In some embodiments, as shown in fig. 16, the protective adhesive layer 9 extends to the first surface of the battery cell 2 and is bonded to the electrode sheet located on the first surface of the battery cell 2 and/or extends to the second surface of the battery cell 2 and is bonded to the electrode sheet located on the second surface of the battery cell 2, so that the electrode sheet exposed on the side surface of the battery cell 2 can be prevented from contacting the casing 1, and meanwhile, the battery cell 2 can be fixed, and the safety, stability and other properties of the battery can be improved.
Furthermore, as shown in fig. 16, the protective adhesive layer 9 may be provided with one or more seventh through holes 90, preferably with a plurality of seventh through holes 90, and the plurality of seventh through holes 90 may be uniformly or non-uniformly distributed on the portion of the protective adhesive layer 9 opposite to the side surface of the battery cell (the portion of the protective adhesive layer 9 is stacked on the side surface (e.g., the second side surface) of the battery cell 2), so that the wettability of the electrolyte to the battery cell 2 can be improved through the seventh through holes 90, the electrolyte can be better infiltrated into the electrode sheet, and the battery performance can be further optimized. In particular, when the number of the protective adhesive layers 9 on any one side of the battery cell 2 is one, the protective adhesive layers 9 on that side may be provided with one or more seventh through holes 90.
The protective adhesive layer 9 may be specifically an adhesive paper, generally having insulation and adhesion, which may be an adhesive paper conventional in the art, and is not particularly limited.
First adaptor 31, first utmost point ear 21, second utmost point ear 22, second adaptor 32 is located electric core 2 and faces the terminal surface of first curb plate 11, the first face of electric core 2 and the second face of electric core 2 are located electric core 2 and face the relative both sides of the terminal surface of first curb plate 11 respectively, the first face of electric core 2 is the thickness direction of electric core 2 (also be the thickness direction of electrode slice) to the direction of the second face of electric core 2, first face (surface) of electric core 2, the second face (surface) of electric core 2 can be parallel (perpendicular with the thickness direction of electrode slice) with the surface of electrode slice, and can be perpendicular with the terminal surface of electric core 2 facing first curb plate 11.
In the invention, the electrode plates located on the first surface of the battery cell 2 and the electrode plates located on the second surface of the battery cell 2 are the outermost electrode plates of the battery cell 2, that is, the rest of the electrode plates are stacked between the electrode plates located on the first surface of the battery cell 2 and the electrode plates located on the second surface of the battery cell 2. The polarity of the electrode sheet located on the first surface of the battery cell 2 may be the same as or different from the polarity of the electrode sheet located on the second surface of the battery cell 2, and may be a positive electrode sheet or a negative electrode sheet, and may be a first electrode sheet or a second electrode sheet, and it is generally preferable that the electrode sheet located on the first surface of the battery cell 2 and the electrode sheet located on the second surface of the battery cell 2 are negative electrode sheets.
Specifically, as shown in fig. 1, 15 and 16, the battery cell 2 includes a plurality of electrode sheets stacked in layers, and the electrode sheets include a first electrode sheet and a second electrode sheet, which are separated by a separator, the polarity of the first electrode sheet is opposite to that of the second electrode sheet, the first electrode sheet may be a positive electrode sheet or a negative electrode sheet, and correspondingly, the second electrode sheet may be a negative electrode sheet or a positive electrode sheet. The end surface of one side of the electric core 2 provided with the tabs (the first tab and the second tab) (i.e. the end surface of one side of the electric core 2 facing the first side plate 11) is parallel to the thickness direction of the electric core 2. Specifically, the electrode plates in the battery cell 2 include current collectors, tabs (first tab 21/second tab 22) are disposed on the current collectors (first current collector/second current collector), and may be specifically disposed at end portions of the current collectors, and an end surface of one side of the battery cell 2 facing the first side plate 11 is formed by end surfaces of one sides of the plurality of electrode plates disposed in a stacked manner, where the tabs are disposed (end surfaces of the electrode plates parallel to a thickness direction thereof).
The battery cell 2 may include a laminated battery cell 2 and/or a wound battery cell 2, where the wound battery cell 2 is formed by stacking a plurality of electrode sheets and then winding the electrode sheets, and specifically is formed by sequentially stacking a first electrode sheet, a diaphragm, and a second electrode sheet and then winding the electrode sheets; the laminated battery cell 2 is formed by sequentially stacking a first electrode plate, a diaphragm and a second electrode plate. The battery of the present invention may specifically include a lithium ion battery, but is not limited thereto.
Specifically, as shown in fig. 1 to 5, the casing 1 may include a first side plate 11, a second side plate 12, a third side plate 13, a fourth side plate 14, a fifth side plate 15, and a sixth side plate 16, where the first side plate 11, the second side plate 12, the third side plate 13, and the fourth side plate 14 are sequentially connected to each other and are respectively located between the sixth side plate 16 (or referred to as a bottom plate) and the fifth side plate 15 (or referred to as a cover plate), so as to form a closed cavity, and the battery cell 2 is located in the cavity. The first side plate 11 and the third side plate 13 are located on two opposite sides of the second side plate 12 (or the fourth side plate 14), the second side plate 12 and the fourth side plate 14 are located on two opposite sides of the first side plate 11 (or the third side plate 13), and the fifth side plate 15 and the sixth side plate 16 are located on two opposite sides of the first side plate 11 (or the second side plate 12, or the third side plate 13, or the fourth side plate 14), respectively. The direction of the fifth side plate 15 to the sixth side plate 16 is the thickness direction of the housing 1, the direction of the first side plate 11 to the third side plate 13 may be the length direction of the housing 1, and the direction of the second side plate 12 to the fourth side plate 14 is the width direction of the housing 1, or the direction of the first side plate 11 to the third side plate 13 is the width direction of the housing 1, and the direction of the second side plate 12 to the fourth side plate 14 is the length direction of the housing 1. One of the first surface of the battery cell 2 and the second surface of the battery cell 2 is a surface of the battery cell 2 facing the fifth side plate 15, the other is a surface of the battery cell 2 facing the sixth side plate 16, and the sixth insulating layer 86 is located between the first connecting piece 51 and the fifth side plate 15 and/or between the fifth connecting piece 55 and the fifth side plate 15.
The first side plate 11 and the second side plate 12, the second side plate 12 and the third side plate 13, and the third side plate 13 and the fourth side plate 14 may be connected by an arc transition portion 17, that is, the connection portion of two adjacent side plates is in arc transition. Specifically, the side of the circular arc transition portion 17 that faces away from the cavity and the side that faces the cavity in cross section perpendicular to the first direction parallel to the direction from the fifth side plate 15 to the sixth side plate 16 (i.e., the thickness direction of the housing 1) are both arcs, respectively, forming a groove that opens toward the cavity.
The case 1 may further include a thinned portion 151, and the mechanical strength of the thinned portion 151 is lower than that of the other portions of the case 1 except for the thinned portion 151, so that when the internal pressure of the battery is too high, the pressure may be preferentially released through the thinned portion 151 to prevent the battery from exploding. Specifically, the thinned portion 151 may be provided on the fifth side plate 15 (the surface of the fifth side plate 15 may be parallel to the surface of the electrode sheet). Specifically, the thickness of the thinned portion 151 is smaller than the thickness of the other portions of the housing 1 except for the thinned portion 151.
In addition, still include the gasket that is used for sealed first through-hole 100 on the casing 1, first through-hole 100 is as annotating the liquid hole for pour into electrolyte into the cavity, pour into electrolyte back, seal notes liquid hole 100 with the gasket, this gasket can include the sheetmetal, and it is located one side that first curb plate 11 deviates from the cavity, can deviate from one side welding of cavity with first curb plate 11, specifically can weld the part that first curb plate 11 is located first through-hole 100 is peripheral, in order to seal first through-hole 100.
In the present invention, the welding may be laser welding, for example, the first connecting piece 51 of the first coupling member 5 may be connected to the second transfer portion 312 of the first coupling member 31 by laser welding, the first through hole 100 may be sealed by laser welding using a sealing sheet, and the like.
The first tab 21 may be a positive tab or a negative tab, i.e. one of the first tab 21 and the second tab 22 is a positive tab and the other is a negative tab, preferably the first tab 21 is a positive tab.
The housing 1 may be a metal packaging case, that is, it may be made of metal, that is, the first side plate 11, the second side plate 12, the third side plate 13, the fourth side plate 14, the fifth side plate 15, and the sixth side plate 16 may be made of metal, such as aluminum, aluminum alloy, nickel, iron, or nickel-iron alloy.
Generally, when the housing 1 is electrically connected to the positive tab, the housing 1 may be made of a material having the same polarity as the positive tab, such as aluminum or an aluminum alloy, and the specific material types of the two may be the same or different (the material of the two is different, such as the material of the positive tab is aluminum, and the material of the housing 1 is an aluminum alloy); when the casing 1 is electrically connected to the negative electrode tab, the casing 1 and the negative electrode tab are made of the same polarity material, such as nickel, iron or nickel-iron alloy, and the specific material types of the casing 1 and the negative electrode tab may be the same or different.
In addition, the material of the first adapter 31, the material of the first coupling member 5, and the material of the first tab 21 may be the same polarity material, for example, the first tab 21 is a positive tab, the material of the first adapter 31, the material of the first coupling member 5, and the material of the first tab 21 may be aluminum or aluminum alloy, and the specific material types may be the same or different. The material of the second adaptor 32, the material of the second coupling member 5 ', and the material of the second tab 22 may be the same polarity material, for example, the second tab 22 is a negative tab, and the material of the second adaptor 32, the material of the second coupling member 5', and the material of the second tab 22 may be nickel, iron, or nickel-iron alloy, and the specific material types may be the same or different.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (27)

1. A battery, comprising:
the shell is enclosed into a cavity; the shell comprises a first side plate, and the first side plate is provided with a first through hole communicated with the cavity;
the battery cell is positioned in the cavity; the battery cell is provided with a first tab;
the first adapter is electrically connected with the first tab; the first adapter is arranged between the first side plate and the battery core, a second through hole is formed in the first adapter, the first adapter is connected with the first side plate, and at least part of the projection of the first through hole and the projection of the second through hole on the first side plate are overlapped.
2. The battery according to claim 1,
one of projections of the first through hole and the second through hole on the first side plate covers the other; and/or the presence of a gas in the atmosphere,
the concentricity of the first through hole and the second through hole is less than or equal to 1.5 mm.
3. The battery of claim 2, wherein the first through-hole is disposed coaxially with the second through-hole.
4. The battery of claim 1 wherein a projection of the first adapter on the first side plate does not overlap a projection of the first tab on the first side plate.
5. The battery of claim 4, wherein the housing further comprises a second side plate connected to the first side plate, a projection of the first adapter on the second side plate at least partially overlapping a projection of the first tab on the second side plate.
6. The battery of claim 1, further comprising a first coupling member between the cell and the first side plate, the first coupling member being connected to the first tab and the first coupling member, respectively.
7. The battery of claim 6, wherein the first coupling member includes a first connecting tab connected to the first coupling member, and a fourth connecting tab connected to a side of the first tab facing away from the cell.
8. The battery of claim 7, wherein the first coupling member further includes a connection assembly connected to the first connection tab and the fourth connection tab, respectively; the connecting component comprises a second connecting piece and a third connecting piece; the second connecting piece is positioned between the first adapter piece and the battery cell; the third connecting piece is positioned between the first tab and the first adapter in the direction from the first adapter to the first tab; the first connecting sheet, the second connecting sheet, the third connecting sheet and the fourth connecting sheet are connected in sequence.
9. The battery of claim 7, wherein the first connecting tab comprises a first connecting portion connected with the first adapter and a second connecting portion extending along the extending direction of the first side plate, and the second connecting portion is connected with the fourth connecting tab.
10. The battery according to any one of claims 7 to 9,
a sixth insulating layer is further arranged on one side, away from the first connecting piece, of the first connecting piece; and/or the presence of a gas in the atmosphere,
a first included angle is formed between one surface of the first conversion piece, which is connected with the first connecting piece, and one surface of the fourth connecting piece, which is connected with the first tab, and the range of the first included angle is 80-120 degrees; and/or the presence of a gas in the gas,
the first connecting piece is welded with the first connecting piece; and/or the presence of a gas in the gas,
the battery cell comprises a plurality of electrode plates which are arranged in a stacked mode, and one surface, connected with the first adapter piece, of the first connecting piece is parallel to the surfaces of the electrode plates; and/or the presence of a gas in the gas,
a second included angle is formed between one surface of the first rotating piece, which is connected with the first side plate, and one surface of the first rotating piece, which is connected with the first connecting piece, and the range of the second included angle is 80-120 degrees; and/or the presence of a gas in the gas,
the projection of the first adapter piece in the thickness direction of the battery cell and the projection of the first connecting piece in the thickness direction of the battery cell have an overlapping region.
11. The battery of claim 1, wherein a third groove is formed in a side of the first adapter facing away from the first side plate, and the third groove is respectively communicated with the second through hole and the cavity.
12. The battery according to claim 11,
the cross section of the third groove, which is parallel to the direction from one side of the first adaptor facing the first side plate to one side of the first adaptor departing from the first side plate, is arc-shaped; and/or the presence of a gas in the atmosphere,
the minimum thickness of the first transfer piece in the direction from the first side plate to the first transfer piece is 0.2-1 mm; and/or the presence of a gas in the atmosphere,
the minimum thickness of the first adapter piece in the thickness direction of the battery cell is 0.2-1 mm.
13. The battery according to claim 11,
the first adapter comprises a first adapter part and a second adapter part which are enclosed into the third groove, the first adapter part is provided with the second through hole, and the first adapter part is connected with the first side plate;
the battery also comprises a first connecting piece which is respectively connected with the first lug and the second adapting part;
one or more reinforcing ribs are arranged between the second switching part and the first switching part.
14. The battery according to claim 13,
the joint part of the second switching part and the first switching part is provided with a reinforcing area corresponding to the position of the reinforcing rib, and the reinforcing area is sunken towards the direction close to the included angle between the second switching part and the first switching part to form the reinforcing rib; and/or the presence of a gas in the gas,
the included angle between the connecting line between one end of the reinforcing rib connected with the first adapter part and one end of the reinforcing rib connected with the second adapter part and the surface of the first adapter part is 30-60 degrees; and/or the presence of a gas in the atmosphere,
and the included angle between the connecting line between one end of the reinforcing rib connected with the first adapter part and one end of the reinforcing rib connected with the second adapter part and the surface of the second adapter part is 30-60 degrees.
15. The battery of claim 13 or 14, wherein the first adapter further comprises a third adapter connected to the first adapter, the third adapter and the second adapter being located on opposite sides of the first adapter.
16. The battery of claim 6, further comprising a third insulating layer between the first link and the first side plate.
17. The battery of claim 16, wherein the first coupling member comprises a fourth coupling tab contiguous with a side of the first tab facing away from the cell, and the third insulating layer comprises a first portion on a side of the fourth coupling tab facing away from the first tab.
18. The battery of claim 17,
the battery cell comprises a plurality of electrode plates which are arranged in a stacked mode;
the battery cell is provided with a first surface and a second surface which are oppositely arranged;
the third insulating layer further comprises a second portion formed by extending from one end, close to the first surface of the battery cell, of the first portion to the direction close to the battery cell, and a third portion formed by extending from one end, close to the second surface of the battery cell, of the first portion to the direction close to the battery cell.
19. The battery of claim 18,
a projection of the first tab in the thickness direction of the cell is located within a projection of the second portion of the third insulating layer in the thickness direction of the cell, and/or,
a projection of the first tab in the thickness direction of the battery cell is located within a projection of a third portion of the third insulating layer in the thickness direction of the battery cell; and/or the presence of a gas in the atmosphere,
the projection of the first tab in the length direction of the battery cell is located in the projection of the first part of the third insulating layer in the length direction of the battery cell.
20. The battery according to claim 18 or 19,
the second part of the third insulating layer extends to the first surface of the battery cell and is bonded with the electrode plate positioned on the first surface of the battery cell; and/or the presence of a gas in the gas,
and the third part of the third insulating layer extends to the second surface of the battery cell and is bonded with the electrode plate positioned on the second surface of the battery cell.
21. The battery of claim 1, wherein a second insulating layer is disposed between the first transition member and the cell.
22. The battery of claim 21, wherein the battery comprises a plurality of electrode sheets stacked together, and wherein the cell has a first side and a second side opposite to each other, and wherein the second insulating layer extends to the first side of the cell and is bonded to the electrode sheets on the first side of the cell, and/or extends to the second side of the cell and is bonded to the electrode sheets on the second side of the cell.
23. The battery according to claim 1,
the end surface of one side of the battery cell, which is provided with the first lug, is parallel to the thickness direction of the battery cell; and/or the presence of a gas in the gas,
the distance from one side, away from the battery cell, of the first lug to the side, connected with the battery cell, of the first lug is not greater than the length of the first adapter piece in the direction from the first side plate to the first lug; and/or the presence of a gas in the gas,
the length of the first adapter is 1mm-4mm along the direction from the first side plate to the first tab; and/or the presence of a gas in the gas,
the first transfer portion is welded to the first side plate.
24. The battery according to claim 1,
the battery cell is also provided with a second tab, and the polarity of the second tab is opposite to that of the first tab;
the battery further comprises a second adaptor, the second adaptor is electrically connected with the second lug, the second adaptor is arranged between the first side plate and the battery core, and the projection of the second adaptor on the first side plate is not overlapped with the projection of the second lug on the first side plate.
25. The battery of claim 24, wherein the housing includes a second side plate connected with the first side plate;
the projection of the first tab on the second side plate at least partially overlaps the projection of the second tab on the second side plate; and/or the presence of a gas in the gas,
the projection of the second adaptor on the second side plate is at least partially overlapped with the projection of the second pole ear on the second side plate; and/or
The projection of the first adapter on the second side plate at least partially overlaps the projection of the second adapter on the second side plate.
26. The battery according to claim 24 or 25,
the first pole lug and the second pole lug are positioned between the first adapter and the second adapter; and/or the presence of a gas in the atmosphere,
the distance from one side, away from the battery cell, of the second lug to the side, connected with the battery cell, of the second lug is not greater than the length of the second adaptor along the direction from the first side plate to the second lug; and/or the presence of a gas in the gas,
the length of the second adaptor is 1mm-3mm along the direction from the first side plate to the second tab; and/or the presence of a gas in the gas,
and the length of the second adapter piece is smaller than that of the first adapter piece along the direction from the first side plate to the second tab.
27. The battery according to claim 1,
the first tab is a negative tab or a positive tab; and/or the presence of a gas in the gas,
the battery cell comprises a laminated battery cell or a winding battery cell.
CN202210304872.1A 2022-03-26 2022-03-26 Battery with a battery cell Pending CN114597610A (en)

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PCT/CN2023/075904 WO2023185283A1 (en) 2022-03-26 2023-02-14 Battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210304872.1A CN114597610A (en) 2022-03-26 2022-03-26 Battery with a battery cell

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