CN112490493A - Safe square metal shell lithium ion battery - Google Patents
Safe square metal shell lithium ion battery Download PDFInfo
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- CN112490493A CN112490493A CN202110067859.4A CN202110067859A CN112490493A CN 112490493 A CN112490493 A CN 112490493A CN 202110067859 A CN202110067859 A CN 202110067859A CN 112490493 A CN112490493 A CN 112490493A
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- Prior art keywords
- lithium ion
- ion battery
- metal shell
- battery core
- negative pole
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 62
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 41
- 239000002184 metal Substances 0.000 title claims abstract description 41
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000011889 copper foil Substances 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 238000003475 lamination Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000011149 active material Substances 0.000 claims description 2
- 239000006258 conductive agent Substances 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 239000010405 anode material Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 8
- 201000009032 substance abuse Diseases 0.000 description 7
- 206010039203 Road traffic accident Diseases 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000003698 laser cutting Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a safe square metal shell lithium ion battery. When the lithium ion battery is extruded from the outside, the two insulating films of the insulating film protective sleeve are pulled by uneven force and are staggered and cracked, and the negative copper foil on the outer surface of the battery core is directly contacted with the inner cavity of the metal shell with positive electricity to form an external short circuit of the battery core; or when the lithium ion battery is punctured by the metal foreign matter, the negative copper foil on the outer surface of the battery core, the metal foreign matter and the metal shell with positive electricity are contacted to form a short circuit outside the battery core. The lithium ion battery energy is released more quickly through the mode of short circuit discharge outside the battery cell, and heat generated by the short circuit discharge outside the battery cell is dispersed through the copper foil with good heat conductivity and the metal shell, so that the oxygen release reaction of the anode material at high temperature caused by local high temperature generated by the quick release of the lithium ion battery energy is relieved, and the safety performance of the lithium ion battery is improved.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to a safety lithium ion battery packaged by a square metal shell.
Background
Under the common recognition of low-carbon economy and carbon neutralization, strategic planning supporting the development of new energy automobiles is provided in main countries all over the world. The lithium ion battery of the new energy automobile has large electricity capacity, and the electricity capacity is 10KWH to 150 KWH; the energy density of the lithium ion battery is high, and usually reaches 100-300 WH/Kg. When a new energy automobile using a lithium ion battery as power is in a traffic accident or similar occasions of abuse such as severe collision, extrusion and the like, serious internal short circuit occurs inside a lithium ion battery core, high temperature generated by the internal short circuit triggers an anode material to generate oxygen release reaction, oxygen is directly provided for raw material combustion of electrolyte and the like inside the lithium ion battery, and fire and even explosion are easily caused, so that the life safety and property safety of personnel are endangered. Therefore, it is necessary to improve the safety of the lithium ion battery.
The application number CN201510438316.3, the invention name "power battery top cover structure and power battery", disclose a power battery top cover structure and power battery, through designing first short-circuit part and second short-circuit part in the top cover structure, and set up as when the internal pressure of power battery increases, first short-circuit part and second short-circuit part move upwards, so that first, second pole post electricity is connected and is formed the protection return circuit, and first short-circuit part and resistance are the parallel relation when forming the protection return circuit, reach and make the power battery form independent protection return circuit respectively under overcharging and piercing the nail abuse, protect the power battery effectively.
The invention patent utilizes the top cover short circuit part to effectively protect the power battery under overcharge and nail penetration abuse of the power battery, but still cannot solve the safety problem caused by serious internal short circuit inside the lithium ion battery in traffic accidents or similar occasions of abuse such as violent collision, extrusion and the like.
Disclosure of Invention
The invention provides a safe square metal shell lithium ion battery, which aims to solve the safety problem of a new energy automobile taking a lithium ion battery as power in traffic accidents or similar occasions of abuse such as severe collision, extrusion and the like.
In order to overcome the defects of the prior art, the invention adopts the following technical scheme:
the utility model provides a square metal casing lithium ion battery of safe type, includes lithium ion battery core and square metal casing, its characterized in that: the square metal shell is electrically conducted with the positive pole column, the positive pole adapter plate and the positive pole piece of the lithium ion battery core through the conductive plastic sealing piece on the positive pole column; two surfaces of the positive pole piece are coated by adopting an isolating film, namely, the surface of the negative pole piece corresponding to the positive pole piece is coated by the isolating film so as to keep the electronic insulation of the positive pole piece and the negative pole piece; the outermost layers of the two main body surfaces of the battery core are copper foil layers of the negative pole piece, and no isolating film is coated outside the copper foil layers; the outer surface of the lithium ion battery cell is coated with an insulating film protection sleeve, so that the battery cell is insulated and electrically isolated from the inner cavity of the square metal shell; the insulating film protection sleeve is formed by splicing two insulating films, and the splicing position is located in the central areas of two main body surfaces of the battery core.
The conductive plastic sealing piece on the positive pole is made of polyether plastic PPS, and black conductive plastic is formed by adding a conductive agent and a toner.
The splicing mode of the insulating films can be selected to use an insulating tape to adhere the overlapped parts of the two insulating layers or to fix the overlapped parts by local hot melting.
The negative pole piece, the negative pole switching piece and the negative pole post are electrically conducted, wherein the negative pole post is insulated and electrically isolated from the top cover plate through the negative pole post insulating plastic sealing piece.
The battery core is manufactured by a lamination process, the copper foil layers of the outermost layers of the two main body surfaces of the battery core are negative pole pieces, the single surfaces of the copper foil layers can be coated with active materials, and copper foils thicker than those adopted by the inner negative pole pieces can be selected, so that the conduction and heat transfer effects of the battery core in an external short circuit mode are enhanced, and the safety performance is enhanced.
The battery core is manufactured by a winding process, and the splicing positions of the insulating film protection sleeve are arranged in the central regions of the two main body surfaces of the battery core, or the central regions of the two main body surfaces of the battery core and the central regions of the two side surfaces of the battery core are arranged.
The metal shell can be selected from an aluminum shell or a stainless steel shell, and the aluminum shell is preferred.
The insulating film protective sleeve is preferably made of polypropylene.
The material of the negative pole post insulating plastic sealing element is preferably polyether plastic PPS.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a design scheme for short circuit energy release when a lithium ion battery is subjected to external extrusion or metal foreign body puncture (consistent with a nail penetration failure mechanism), wherein an electrical short circuit is formed by directly utilizing the contact of a negative copper foil on the outer surface of a battery core and an inner cavity of a metal shell with positive electricity, the energy of the lithium ion battery is released more quickly in a mode of short circuit discharge outside the battery core, the damage of the energy generated by the short circuit in the battery core to a positive material is relieved, and the lithium ion battery is effectively and safely protected.
The copper foil layer of the cathode pole piece on the outermost layer of the battery core, the insulating film protection sleeve with the splicing position, the metal shell, the conductive plastic sealing element of the anode pole, the anode adapter sheet and the anode pole piece are designed into a potential battery core external short circuit structure. The outer surface of the outer copper foil layer of the battery core is not provided with an isolation film layer, and the battery core is coated by an insulating film protection sleeve, so that the battery core is electrically isolated from the metal shell in a normal state. When a new energy automobile has a traffic accident or similar occasions of violent collision, extrusion and other abuses, the energy of the lithium ion battery is quickly released through the battery cell external short circuit structure, the damage of the energy generated by short circuit in the battery cell to the anode material is relieved, and the lithium ion battery is effectively and safely protected.
Drawings
FIG. 1: a design scheme of a safe square metal shell lithium ion battery and a safety protection mechanism schematic diagram of the lithium ion battery are provided.
FIG. 2: schematic diagram of a scheme A for forming a lithium ion battery pole piece by a lamination process.
FIG. 3: and (3) a scheme B of the lamination process lithium ion battery pole piece forming is schematically shown.
FIG. 4: schematic diagram of a lithium ion battery pole piece forming scheme by a winding process.
FIG. 5: insulating film protection sleeve assembly scheme.
FIG. 6: a design scheme of a safe square metal shell lithium ion battery and an assembly schematic diagram of key components of the lithium ion battery are provided.
In the figure, a single-sided negative pole piece 1, a positive pole piece 2, an isolating membrane 3, a double-sided negative pole piece 4, a negative pole tab 5-1, a positive pole tab 5-2, a negative pole adapter sheet 6-1, a positive pole adapter sheet 6-2, a negative pole post 7-1, a positive pole post 7-2, a negative pole post insulating plastic sealing member 8-1, a positive pole post conductive plastic sealing member 8-2, a top cover plate 9, a top cover inner plastic member 10, a metal shell 11, an insulating film protecting sleeve member 12, an insulating film protecting sleeve member and top cover inner plastic member thermal fusion area 13 and an insulating adhesive tape 14.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
The forming processing scheme of the single-sided negative pole piece 1 and the double-sided negative pole piece 4 is described with reference to the attached drawings 2, 3 and 4.
Referring to the attached figure 2, a negative active material is coated on the two sides of a copper foil, and after drying and rolling, a double-sided negative pole piece 4 is produced by punching or laser cutting by using a hardware die. And coating a negative active material on one side of the copper foil, drying and rolling, and punching or laser cutting by using a hardware die to generate the single-side negative pole piece 1. The copper foil used by the single-sided negative pole piece 1 can be thicker than the copper foil used by the double-sided negative pole piece 4, so that the electric conduction and heat transfer effects under the external short circuit mode of the battery cell are enhanced, and the safety performance of the lithium ion battery is enhanced. When the lamination process is selected, the method is the preferable processing scheme of the single-sided negative pole piece 1.
Referring to the attached drawings 3 and 4, one surface of a copper foil is continuously coated with a negative active material, the other surface of the copper foil is coated with the negative active material at intervals, and after drying and rolling, a single-sided negative pole piece 1 and a double-sided negative pole piece 4 are generated by punching or laser cutting through a hardware die.
The positive pole piece 2 adopts aluminum foil as a base material, and is coated with a positive active material, and the processing method is similar to that of the double-sided negative pole piece 4.
The manufacturing process of the battery core can select a lamination process or a winding process.
When the lamination process is selected, the first piece and the last piece are single-sided negative pole pieces 1, the copper foil layer of the single-sided negative pole piece 1 faces the outside of the battery core, and the middle layer is sequentially provided with an isolating film 3, a positive pole piece 2, an isolating film 3, a double-sided negative pole piece 4, an isolating film 3, a positive pole piece 2, an isolating film 3 and the like. After lamination, the four sides of the battery core are fixed by using the insulating adhesive tapes 14 to prevent the pole pieces from loosening and dislocation.
When a winding process is selected, the positive pole piece 2, the isolating film 3, the double-sided negative pole piece 4 and the isolating film 3 are oppositely wound according to the design size of the product and wound to the designed number of layers, the single-sided negative pole piece 1 connected with the double-sided negative pole piece 4 is used for covering the battery core for one circle, and the copper foil layer of the single-sided negative pole piece 1 is kept facing the outside of the battery core. After winding, the copper foil ending part of the single-sided negative pole piece 1 is fixed by the insulating tape 14 to prevent the pole piece from loosening and dislocation.
And after lamination or winding, cold pressing or hot pressing and shaping the battery core, and then carrying out insulation test to pick out the internal short circuit battery core.
Referring to fig. 1 and 6, the assembly process of the lithium ion battery is explained. The negative pole tab 5-1 and the negative pole adapter sheet 6-1 are connected together in an ultrasonic welding mode. The negative pole adapter sheet 6-1 and the negative pole post 7-1 are connected together in a laser welding mode. The positive pole lug 5-2 and the positive pole adapter sheet 6-2 are connected together in an ultrasonic welding mode. The positive pole adapter sheet 6-2 and the positive pole post 7-2 are connected together in a laser welding mode. And shaping, dedusting and sticking an insulating tape for protection on the ultrasonic welding position and the laser welding position.
Folding positive negative pole utmost point ear and switching piece.
The method for manufacturing the insulating protective sheath 12 is explained with reference to fig. 5. The insulating film 12-1 is punched out in a solid line and folded in a dotted line in a plan view of the figure.
Referring to fig. 5 and 6, after the two insulating films 12-1 are combined together to wrap the battery cell, the splicing position of the two insulating films 12-1 is fixed by using an insulating tape 14, and the insulating film protective sheath 12 is formed. And forming a thermal fusion area 13 of the insulating film protection sleeve and the plastic part in the top cover by using a hot melting mode, and fixing the insulating film protection sleeve 12 and the plastic part 10 in the top cover together.
Referring to fig. 6, the battery cell coated with the insulative film protective sheathing member 12 is encased in an aluminum case 11. And then the aluminum shell 11 and the top cover plate 9 are connected together in a laser welding mode.
The top cover plate 9 is also integrated with a liquid injection hole and an explosion-proof valve, which are conventional in the industry and are not marked in the figure.
The manufacturing of the lithium ion battery is completed by the conventional technology in the industry, such as high-temperature vacuum baking the lithium ion battery to remove moisture, filling electrolyte, formation activation, sealing of a liquid filling hole by a sealing nail in a laser welding mode, coating of an insulating film on the outside of the lithium ion battery, and the like.
When the lithium ion battery is extruded from the outside (corresponding to a 110-1# failure mode shown in figure 1), two insulating films of the insulating film protective sleeve are pulled by uneven force and are cracked in a staggered mode, a negative copper foil on the outer surface of the battery core is directly contacted with an inner cavity of a metal shell with positive electricity to form a battery core external short circuit, the energy of the lithium ion battery is released more quickly in a battery core external short circuit discharging mode, heat generated by the battery core external short circuit discharging is dispersed through the copper foil with good heat conductivity and the metal shell, and oxygen release response of a positive electrode material at high temperature caused by local high temperature generated by the quick release of the energy of the lithium ion battery is relieved, so that the safety performance of the lithium ion battery is improved. In particular to the improvement of the safety of the new energy automobile taking the lithium ion battery as power in traffic accidents or similar abusive occasions such as violent collision, extrusion and the like.
When the lithium ion battery is punctured by a metal foreign body (corresponding to the 110-2# failure mode shown in figure 1), the negative copper foil on the outer surface of the battery core, the metal foreign body and the positively charged metal shell are contacted to form an external short circuit of the battery core. The lithium ion battery energy is released more quickly through the mode of short circuit discharge outside the battery cell, and heat generated by the short circuit discharge outside the battery cell is dispersed through the copper foil with good heat conductivity and the metal shell, so that the oxygen release reaction of the anode material at high temperature caused by local high temperature generated by the quick release of the lithium ion battery energy is relieved, and the safety performance of the lithium ion battery is improved. In particular to the improvement of the safety of the new energy automobile taking the lithium ion battery as power in the traffic accident or the abuse occasions such as puncture to the lithium ion battery caused by similar violent collision.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (9)
1. The utility model provides a square metal casing lithium ion battery of safe type, includes lithium ion battery core and square metal casing, its characterized in that: the square metal shell is electrically conducted with the positive pole column, the positive pole adapter plate and the positive pole piece of the lithium ion battery core through the conductive plastic sealing piece on the positive pole column; two surfaces of the positive pole piece are coated by adopting an isolating film, namely, the surface of the negative pole piece corresponding to the positive pole piece is coated by the isolating film so as to keep the electronic insulation of the positive pole piece and the negative pole piece; the outermost layers of the two main body surfaces of the battery core are copper foil layers of the negative pole piece, and no isolating film is coated outside the copper foil layers; the outer surface of the lithium ion battery cell is coated with an insulating film protection sleeve, so that the battery cell is insulated and electrically isolated from the inner cavity of the square metal shell; the insulating film protection sleeve is formed by splicing two insulating films, and the splicing position is located in the central areas of two main body surfaces of the battery core.
2. The safe square metal shell lithium ion battery of claim 1, wherein: the conductive plastic sealing piece on the positive pole is made of polyether plastic PPS, and black conductive plastic is formed by adding a conductive agent and a toner.
3. The safe square metal shell lithium ion battery of claim 2, wherein: the splicing mode of the insulating films is that the overlapped parts of the two insulating layers are adhered by using an insulating tape or the overlapped parts are locally hot-melted and fixed.
4. The safe square metal shell lithium ion battery of claim 3, wherein: the negative pole piece, the negative pole switching piece and the negative pole post are electrically conducted, wherein the negative pole post is insulated and electrically isolated from the top cover plate through the negative pole post insulating plastic sealing piece.
5. The safe square metal shell lithium ion battery of claim 4, wherein: the battery core is manufactured by a lamination process, the copper foil layers of the outermost layers of the two main body surfaces of the battery core are negative pole pieces, the single surfaces of the copper foil layers can be coated with active materials, and copper foils thicker than those adopted by the inner negative pole pieces can be selected, so that the conduction and heat transfer effects of the battery core in an external short circuit mode are enhanced, and the safety performance is enhanced.
6. The safe square metal shell lithium ion battery of claim 4, wherein: the battery core is manufactured by a winding process, and the splicing positions of the insulating film protection sleeve are arranged in the central regions of the two main body surfaces of the battery core, or the central regions of the two main body surfaces of the battery core and the central regions of the two side surfaces of the battery core are arranged.
7. The safety square metal shell lithium ion battery of claim 5 or 6, wherein: the metal shell is an aluminum shell or a stainless steel shell, and preferably an aluminum shell.
8. The safe square metal shell lithium ion battery of claim 7, wherein: the insulating film protective sleeve is preferably made of polypropylene.
9. The safe square metal shell lithium ion battery of claim 8, wherein: the material of the negative pole post insulating plastic sealing element is preferably polyether plastic PPS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110067859.4A CN112490493A (en) | 2021-01-19 | 2021-01-19 | Safe square metal shell lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110067859.4A CN112490493A (en) | 2021-01-19 | 2021-01-19 | Safe square metal shell lithium ion battery |
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| CN112490493A true CN112490493A (en) | 2021-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116759655A (en) * | 2023-08-14 | 2023-09-15 | 深圳海辰储能控制技术有限公司 | Preparation process of laminated battery cell, laminated battery cell and battery |
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| CN210607340U (en) * | 2019-11-26 | 2020-05-22 | 欣旺达电子股份有限公司 | Lithium ion battery with safety protection structure |
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