CN110071294A - Lithium ion battery structure - Google Patents

Lithium ion battery structure Download PDF

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Publication number
CN110071294A
CN110071294A CN201910373345.4A CN201910373345A CN110071294A CN 110071294 A CN110071294 A CN 110071294A CN 201910373345 A CN201910373345 A CN 201910373345A CN 110071294 A CN110071294 A CN 110071294A
Authority
CN
China
Prior art keywords
electrode active
collector
complex
porous
lithium ion
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
CN201910373345.4A
Other languages
Chinese (zh)
Inventor
杨志明
周华民
陶波
黄志高
周军
张云
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.)
Shenzhen Xinyuren Polytron Technologies Inc
Shenzhen Xinyuren Technology Co Ltd
Original Assignee
Shenzhen Xinyuren Polytron Technologies Inc
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 Shenzhen Xinyuren Polytron Technologies Inc filed Critical Shenzhen Xinyuren Polytron Technologies Inc
Priority to CN201910373345.4A priority Critical patent/CN110071294A/en
Publication of CN110071294A publication Critical patent/CN110071294A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • H01M10/0585Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/64Carriers or collectors
    • H01M4/66Selection of materials
    • H01M4/661Metal or alloys, e.g. alloy coatings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/64Carriers or collectors
    • H01M4/70Carriers or collectors characterised by shape or form
    • H01M4/80Porous plates, e.g. sintered carriers
    • H01M4/808Foamed, spongy materials
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing 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)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

A kind of lithium ion battery structure, porous aluminium foil and porous copper foil as positive and negative collector are covered each by porous septum both side surface, form collector-diaphragm complex, and the whole duct of collector-diaphragm complex has connectivity;One end of anode ear and negative electrode lug is connected with the collector-diaphragm complex aluminium foil and copper foil respectively;The collector-diaphragm complex separates two sides positive electrode active materials coating and negative electrode active material coating, adjacent intimate surface contact forms the period stepped construction of positive electrode active materials coating-complex-negative electrode active material coating-complex-positive electrode active materials coating.The present invention can promote the performance and manufacturing quality of Current commercial lithium ion battery.

Description

Lithium ion battery structure
Technical field
The invention belongs to power technique fields, and in particular to arrive a kind of lithium ion battery structure.
Background technique
The advantages that lithium ion battery is with its high-energy density, high power performance, without memory and low self-discharge rate is extensive Applied to consumer electronics field and new energy field.The energy density of lithium ion battery, power-performance depend not only on internal Electrode, electrolyte material are also related to the close structure of electro-chemical systems.In terms of cell safety, battery structure also has certainly Qualitative effect, as 7 explosive incident of Samsung mobile phone Note just because of when battery structure designs, excess compression volume is caused in Short circuit, to cause thermal runaway and be formed.
Currently, there are mainly three types of the overall configurations of industrial lithium ion battery comparative maturity: cylinder takeup type, rectangular winding Formula and stacked.Pole piece is presented in a thickness direction and is periodically laminated for the battery core of these three structures, when battery work, electrification Reaction is learned independently to carry out between each duplicate electrode pair respectively.Electricity is improved to shorten Ion transfer distance for single electrode Pond multiplying power property, coating layer thickness have the development trend of reduction.This aspect can reduce the energy density of monomer;On the other hand, exist The more difficult control of the consistency of coating process coating thickness, causes thickness of electrode uneven, influences battery product quality.To reduce Inert matter accounting, the collector of commercial Li-ion batteries are equally constantly being thinned, especially the biggish copper foil of density.And collect The excessively thin risk that will increase battery core manufacturing process band of discontinuance of fluid, therefore, this technology path for improving energy density is again backward It will receive very big restriction.
New lithium ion battery structure and corresponding manufacturing process are the hot spots of world community concern and research.For example moral Motor corporation, state is researching and developing the bipolar lithium ion battery of big plane energetically, it is contemplated that the volume energy of battery can be substantially improved in the structure Metric density increases the course continuation mileage of automobile.
Summary of the invention
The present invention is directed to propose a kind of novel lithium ion battery structure, to promote the property of Current commercial lithium ion battery Energy and manufacturing quality.
The invention proposes a kind of lithium ion battery structure, porous aluminium foil and porous copper foil point as positive and negative collector It is not covered in porous septum both side surface, forms collector-diaphragm complex, the whole hole stage property of collector-diaphragm complex There is connectivity;One end of anode ear and negative electrode lug is connected with the collector-diaphragm complex aluminium foil and copper foil respectively;Institute It states collector-diaphragm complex to separate two sides positive electrode active materials coating and negative electrode active material coating, adjacent surface is tight Contiguity touching forms positive electrode active materials coating-complex-negative electrode active material coating-complex-positive electrode active materials and applies The period stepped construction of layer.
The thickness of the porous aluminium foil and porous copper foil selects between 5 μm ~ 10 μm, the average pore size of hole 1 μm ~ It is selected between 100 μm, porosity selects between 50% ~ 80%.
The thickness of the porous septum selects between 10 μm ~ 30 μm.
The positive electrode active materials coating and negative electrode active material coating layer thickness selects between 50 μm ~ 200 μm.
The present invention can make lithium ion battery receive it is following the utility model has the advantages that
1. collector weight saving reduces lithium ion battery inert matter quality accounting, mass energy density is improved.Afflux Body, diaphragm general thickness also reduce, and reduce inert matter volume accounting, and volume energy density improves.
2. the porous surface of afflux bulk metal layer can more closely be contacted with active material coating, coating and collector are bonded Intensity improves, and active material is unlikely to be peel off in battery manufacture or use process.
3. positive and negative and active material coating can be general commercial Li-ion electricity in the case where guaranteeing the identical situation of high rate performance Twice of pond pole piece one-sided coatings thickness, thus coating layer thickness fluctuation is relatively small in coating, consistency is more preferable, can make battery Possess longer cycle life.
4. the pore network being integrally connected to can make each layer electrode be interconnected to by the electrolyte filled in hole, work as electricity The inhomogeneities of each layer ion concentration is eased when the work of pond, and lithium ion battery is made to have better charge and discharge performance.
5. each layer porosity communication makes electrolyte wetting efficiency be increased dramatically in fluid injection, manufacture efficiency is improved, from And production cost reduces.
6. the present invention also largely remains existing structure and manufacturing process while improving structure, therefore realizes Come relatively easy.
Detailed description of the invention
Fig. 1 is battery core schematic diagram of laminated structure;
Fig. 2 is the Porous Cu film surface image prepared;
Fig. 3 is tab and a kind of connected mode schematic diagram of collector in the present invention;
Fig. 4 is tab and collector another kind connected mode schematic diagram in the present invention;
Fig. 5 is positive and negative plate structural schematic diagram in the present invention.
Specific embodiment
It should be appreciated that specific embodiment described herein is only to illustrate, it is not intended to limit the present invention.Below will The present invention is described in further detail in conjunction with attached drawing.
Referring to Fig. 1, the invention proposes a kind of lithium ion battery structure, including the porous aluminum as positive and negative collector Foil 2 and porous copper foil 4, which are covered each by, forms collector-diaphragm complex 10, collector-diaphragm in 3 both side surface of porous septum The whole duct of complex has connectivity.Anode ear, negative electrode lug one end respectively with the collector-diaphragm complex two sides Aluminium foil 2 be connected with copper foil 4.The collector-diaphragm complex applies the positive electrode active materials for being located at the left and right sides Layer 1 and negative electrode active material coating 5 separate, neighboring layers intimate surface contact, form " positive electrode active materials coating 1- complex The period stepped construction of 10- negative electrode active material coating 5- complex 10- positive electrode active materials coating 1 ".
Please refer to figs. 2 and 3, and the cellular aluminium foil 2 and 4 surface of cellular copper foil are divided into non-porous 7 He of fringe region Porous dispensing area 8, the porous zone 8 is as shown in Figure 2.For the stacked and wound lithium ion battery of square ring, bear Tab 6 is that the edge that the negative current collector 4 reserves is cut into (see figure 3).For cylinder takeup type, the negative electrode lug 6 To be fixed on the nickel metal bar (see figure 4) on the negative current collector 4 with adhesive tape.Fig. 3 and Fig. 4 only depicts the case where cathode, Positive situation is same.
The thickness of the porous aluminium foil 2 and porous copper foil 4 between 5 μm ~ 10 μm, border width after cutting 1 μm ~ Between 2 μm.The pore size distribution of the porous zone 8 is in 1 μm ~ 100 μ ms, and porosity is between 50% ~ 80%.
Referring to Fig. 5, the porous aluminium foil 2 and porous copper foil 4 and the 3 surface gluing of porous septum, pay attention to break The connectivity in duct between bad three regions, to obtain collector-diaphragm complex.Then, the collector-diaphragm is multiple Zoarium is used as substrate, and the electrode slurry made is coated on by current electrodes of lithium-ion batteries painting process, different , the one side of substrate is only coated here.The face positive plate coated with anode sizing agent is negative on one side with what negative electrode slurry coated Pole piece.After drying, roll-in, cutting, by positive and negative two kinds of pole pieces alternately winding or lamination and obtain battery core, remaining step with work as Preceding commercial Li-ion batteries manufacturing process is identical, and which is not described herein again, but technological parameter should be done accordingly according to specific actual conditions Adjustment.
The porous septum 3 uses conventional PP(polypropylene), PE(polyethylene) porous septum, thickness is selected in 10 μm ~ 30 μm between.
The thickness of the positive electrode active materials coating 1 and negative electrode active material coating 5 is each about general commercial Li-ion electricity Twice of pond pole piece single side coating layer thickness, range are selected at 50 μm ~ 200 μm.
The embodiment that the lithium ion battery with structure of the invention is more specifically illustrated in the present embodiment, but and do not have to In limitation implementation of the invention.All application lithium ion battery structures proposed by the present invention, are all contained in patent of the invention Within protection scope.

Claims (4)

1. a kind of lithium ion battery structure, it is characterised in that: porous aluminium foil and porous copper foil as positive and negative collector cover respectively It is placed on porous septum both side surface, forms collector-diaphragm complex, the whole duct of collector-diaphragm complex, which has, to be connected The general character;One end of anode ear and negative electrode lug is connected with the collector-diaphragm complex aluminium foil and copper foil respectively;The collection Fluid-diaphragm complex separates two sides positive electrode active materials coating and negative electrode active material coating, and adjacent surface closely connects Touching forms positive electrode active materials coating-complex-negative electrode active material coating-complex-positive electrode active materials and applies The period stepped construction of layer.
2. lithium ion battery structure according to claim 1, it is characterised in that: the thickness of the porous aluminium foil and porous copper foil Degree selects between 5 μm ~ 10 μm, and the average pore size of hole selects between 1 μm ~ 100 μm, and porosity is selected between 50% ~ 80% It selects.
3. lithium ion battery structure according to claim 1 or 2, it is characterised in that: the thickness of the porous septum is in 10 μ It is selected between m ~ 30 μm.
4. lithium ion battery structure according to claim 1 or 2, it is characterised in that: the positive electrode active materials coating and Negative electrode active material coating layer thickness selects between 50 μm ~ 200 μm.
CN201910373345.4A 2019-05-07 2019-05-07 Lithium ion battery structure Pending CN110071294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910373345.4A CN110071294A (en) 2019-05-07 2019-05-07 Lithium ion battery structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910373345.4A CN110071294A (en) 2019-05-07 2019-05-07 Lithium ion battery structure

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CN110071294A true CN110071294A (en) 2019-07-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113314698A (en) * 2020-02-27 2021-08-27 通用汽车环球科技运作有限责任公司 Composite reference electrode substrate and associated methods
CN113451586A (en) * 2021-05-27 2021-09-28 天津国安盟固利新材料科技股份有限公司 Electrode plate of secondary battery, secondary battery and preparation method of secondary battery
CN115051112A (en) * 2022-07-12 2022-09-13 远景动力技术(江苏)有限公司 Composite diaphragm and application thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106469825A (en) * 2015-08-21 2017-03-01 北京好风光储能技术有限公司 A kind of high-power high-capacity lithium ion battery and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106469825A (en) * 2015-08-21 2017-03-01 北京好风光储能技术有限公司 A kind of high-power high-capacity lithium ion battery and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113314698A (en) * 2020-02-27 2021-08-27 通用汽车环球科技运作有限责任公司 Composite reference electrode substrate and associated methods
CN113451586A (en) * 2021-05-27 2021-09-28 天津国安盟固利新材料科技股份有限公司 Electrode plate of secondary battery, secondary battery and preparation method of secondary battery
CN115051112A (en) * 2022-07-12 2022-09-13 远景动力技术(江苏)有限公司 Composite diaphragm and application thereof

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Application publication date: 20190730

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