CN112421154A - Lithium battery top cover assembly, lithium battery and preparation method of lithium battery - Google Patents
Lithium battery top cover assembly, lithium battery and preparation method of lithium battery Download PDFInfo
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- CN112421154A CN112421154A CN202011123193.1A CN202011123193A CN112421154A CN 112421154 A CN112421154 A CN 112421154A CN 202011123193 A CN202011123193 A CN 202011123193A CN 112421154 A CN112421154 A CN 112421154A
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- utmost point
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- point post
- battery
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 54
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims description 42
- 238000001746 injection moulding Methods 0.000 claims description 30
- 150000001875 compounds Chemical class 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 15
- 229920003023 plastic Polymers 0.000 claims description 15
- 238000004080 punching Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 11
- 238000004804 winding Methods 0.000 abstract description 8
- 238000004146 energy storage Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 18
- 239000000243 solution Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000013329 compounding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 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
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a battery top cover assembly, a battery and a preparation method of the battery, and relates to the technical field of energy storage batteries. The lithium battery comprises a first battery winding core, a second battery winding core and an aluminum shell, wherein a lug of the first battery winding core is ultrasonically and electrically connected with a first pole connecting sheet, and a lug of the second battery winding core is ultrasonically and electrically connected with a second pole connecting sheet. A preparation method of the lithium battery top cover assembly is also provided. The integrated punch forming mode reduces the complex assembly process and improves the safety performance of the safety valve.
Description
Technical Field
The invention relates to the technical field of energy storage batteries, in particular to a lithium battery top cover assembly, a lithium battery and a preparation method of the lithium battery.
Background
With the rapid development of 5G, energy storage, electric vehicles, Internet of things and the like, the application of lithium ion batteries in the fields is more and more extensive. The safety, reliability, high specific energy, life and cost of lithium ion batteries also force people to make more rational choices.
The power battery top cover structure comprises an injection molding structure, a welding and injection molding structure and the like, and the pole column structure of the top cover structure is complex, the processing technology is complex, and the cost of the power battery top cover is higher. Through patent retrieval, the battery top cover structure in patent document CN211376681U and patent document CN110233215A is that one end utmost point post has a through-hole and utmost point post passes through the through-hole assembly and forms, and this structure need be got through the battery top cover, and the safety valve piece is assembled earlier then the welding, has increased loaded down with trivial details assembly process, and the material cost of consumption increases.
Therefore, the lithium ion battery top cover has too many parts and complex assembly production and process, which results in poor consistency of the battery cover plate.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the technical problem that the assembly process of the lithium battery top cover assembly is complex, the invention provides the lithium battery top cover assembly and the lithium battery.
2. Technical scheme
In order to solve the problems, the technical scheme provided by the invention is as follows:
the utility model provides a lithium battery top cap subassembly, includes first utmost point post, the compound utmost point post subassembly of second, second utmost point post hole, relief valve and top cap worn-out fur, first utmost point post, relief valve and second utmost point post hole set up on the top cap worn-out fur, by top cap worn-out fur punching press integrated into one piece, the compound utmost point post subassembly of second includes injection moulding's the compound utmost point post of second and the compound utmost point post carriage of second, the compound utmost point post of second is fixed in through the compound utmost point post carriage of second the second is downthehole. First utmost point post, relief valve and the second utmost point post hole on the top cap worn-out fur are by stamping equipment one-time stamping forming, and the nick of relief valve is formed by the direct punching press of stamping workpiece, and the frame of the compound utmost point post bearer frame of second bears the compound utmost point post of second to it is downthehole to fix the compound utmost point post of second to the second utmost point post, prevents that the compound utmost point post of second from splines because of receiving torsion rotation. The second composite pole is directly formed by injection without a sealing ring structural member.
Optionally, a liquid injection hole formed in an integrally punched manner is formed in the top cover light plate, and the liquid injection hole is located on one side of the second pole hole. Annotate the liquid hole and by stamping equipment one-time stamping forming with first utmost point post, relief valve and second utmost point post hole, through annotating the liquid hole, can inject electrolyte into in the battery.
Optionally, the injection molding device further comprises a lower injection molding support, wherein a first pole column hole matched with the second pole column hole and a lower injection molding through hole matched with the injection hole are formed in the lower injection molding support. The lower injection molding support is arranged below the top cover light plate and used for supporting and fixing the top cover light plate, the liquid injection hole and the lower injection molding through hole jointly form a channel for injecting electrolyte into the power battery, and the first pole post hole and the second pole post hole jointly form a channel for fixing the second composite pole post.
Optionally, a plastic part is arranged between the first pole and the lower injection molding support and used for filling the inner space of the first pole. The plastic part is one or a combination of PPS, PBT, PC, PPA and PA. The cavity below the first pole is filled with a plastic piece. The working of plastics plays sealed, insulating, connects and splines the effect such as changes, also plays the effect of connecting top cap worn-out fur and first utmost point post.
Optionally, still include utmost point post coupling assembling for connect the electric core utmost point ear of battery, utmost point post coupling assembling includes first utmost point post connection piece and the compound utmost point post connection piece of second, first utmost point post connection piece surface with the support bottom surface fixed connection is moulded to the face down that first utmost point post corresponds, second utmost point post connection piece surface with the support bottom surface fixed connection is moulded to the face down that the compound utmost point post subassembly of second corresponds. The bottom surfaces of the lower injection molding supports corresponding to the first pole connecting piece surface and the first pole are fixedly connected through laser welding, and the bottom surfaces of the lower injection molding supports corresponding to the second composite pole assembly surface and the second composite pole assembly are fixedly connected through laser welding, so that the pole connecting assembly is electrically connected with positive and negative pole lugs of a battery core.
Optionally, an epoxy resin plate is arranged below the first pole connecting sheet. The internal cavity of the first pole column is fixed with the epoxy resin plate through physical riveting and plastic parts by filling the plastic parts, and the fixed insulating epoxy resin plate can play a role in protecting the first pole column.
Optionally, the material of the side wall surface of the second composite pole is copper, and the material of the top end surface of the second composite pole is aluminum. The side wall surface of the second composite pole is made of copper, the top end surface of the second composite pole is made of aluminum, and the side wall surface and the top end surface are connected through thermal compounding. The thermal composite piece improves the stability and reliability of the copper-aluminum interface.
Optionally, the height and shape of the punch forming of the first pole are consistent with those of the second composite pole. Adopt stamping equipment to carry out the punching press to first utmost point post, first utmost point post stamping forming's height and shape are unanimous with the height and the shape that the compound utmost point post of second formed of moulding plastics, and first utmost point post and the symmetry of the compound utmost point post of second set up on the top cap worn-out fur.
The utility model provides a lithium battery, includes any one of the aforesaid lithium cell top cap subassembly, still include that first battery rolls up core, second battery roll up core and aluminum hull casing, the utmost point ear that first battery rolled up the core with first utmost point post connection piece ultrasonic welding realizes the electricity and connects, the utmost point ear that the second battery rolled up the core with second utmost point post connection piece ultrasonic welding realizes the electricity and connects, first battery rolls up the core and the second battery rolls up the core and packs into in the aluminum hull casing. Roll up the core with first battery and roll up the core with the second battery and pack into in the aluminum hull casing, the core utmost point ear ultrasonic bonding is rolled up with first battery through first utmost point post connection piece to lithium cell roof subassembly inside, and core utmost point ear ultrasonic bonding is rolled up with the second battery to realize the electricity of lithium cell roof subassembly and battery electricity core and be connected. After the electric connection is completed, the top cover light plate and the aluminum shell are sealed through laser welding, and the laser welding sealing can ensure the connection sealing of the aluminum shell and the lithium battery top cover component.
A method for preparing a lithium battery top cover assembly, comprising any one of the above lithium battery top cover assemblies, comprising:
(1) stamping the top cover light plate by stamping equipment at one time to form a first pole, a safety valve, a second pole hole and a liquid injection hole;
(2) and (3) carrying out high-temperature annealing treatment on the integrally punched and formed top cover light plate at the temperature of 300-500 ℃, and keeping the temperature for 30-60min to ensure that the valve pressure range of the safety valve is 0.6-1.2 MPa.
The preparation method of the lithium battery top cover component in the scheme relates to a heat treatment process, namely, the integrally punched and formed top cover light plate is subjected to high-temperature annealing treatment, the temperature can be 300 ℃, 400 ℃ and 500 ℃, the heat preservation time can be 30min, 45min and 60min, the valve pressure range of a safety valve punched and formed on the top cover light plate is increased from 0.6MPa to 0.9MPa to 0.6MPa to 1.2MPa, the increase of the valve pressure range can prevent the thermal runaway risk accumulation caused by the failure of the safety valve, the thermal runaway of a battery cell is reduced, the concentrated release of heat caused by the simultaneous opening of the valve is caused, and the risk such as battery damage is caused. To a certain extent, the surface of the safety valve is ensured to remove stress and keep good deformation.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the first pole, the safety valve and the second pole hole in the top cover light plate are formed by one-time stamping through stamping equipment, the nick of the safety valve is formed by directly stamping through a stamping part, the frame of the second composite pole bearing frame bears the second composite pole, the second composite pole is fixed in the second pole hole, and the second composite pole is prevented from rotating and stopping due to torsion. The second composite pole is directly formed by injection without a sealing ring structural member.
(2) The first pole and the safety valve are integrally formed by stamping, so that the complex assembly process and high material cost of the first pole can be reduced, the stamped boss of the first pole is equal in potential to the aluminum shell of the lithium battery, and the consistency of the connection internal resistance and voltage of the first pole and the aluminum shell in the life cycle of the lithium battery is ensured.
(3) Compared with the existing processing technology that the safety valve plate is assembled firstly and then welded, the safety valve provided by the embodiment of the invention is formed by integrally punching the top cover light plate, so that the processes and parts are reduced, the practicability is realized, and meanwhile, the manufacturing cost of raw materials is reduced by the punched safety valve.
(4) In the second composite pole assembly provided by the embodiment of the invention, the side wall surface of the second composite pole is a copper surface, the top end surface of the second composite pole is an aluminum surface, the outer side wall surface of the second composite pole is a copper surface, and the top end surface is an aluminum surface, so that the connection between the copper surface and the aluminum surface is realized through thermal compounding. The thermal compounding improves the stability and reliability of the copper-aluminum interface.
(5) According to the embodiment of the invention, the top cover assembly is electrically connected with the lug of the battery roll core through ultrasonic welding, the top cover light plate and the aluminum shell are sealed through laser welding, and the laser welding sealing can ensure the connection sealing of the aluminum shell and the lithium battery top cover assembly.
(6) According to the manufacturing method of the lithium battery top cover assembly provided by the embodiment of the invention, the integrally punched and formed top cover light plate is subjected to high-temperature annealing treatment, so that the safety valve is ensured to meet the conditions of sufficient mechanical strength and a certain valve opening pressure range (the valve pressure range of the safety valve is adjusted to be 0.6-1.2 MPa), the installation welding procedures are reduced, and meanwhile, the safety of the lithium battery is improved to a certain extent.
Drawings
Fig. 1 is a schematic diagram illustrating an explosive structure of a lithium battery top cover assembly and a lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lithium battery top cover assembly according to an embodiment of the present invention.
The symbols in the drawings illustrate that:
1. a first pole column; 2. a second composite pole assembly; 21. a second composite pole; 211. a side wall surface; 212. a top end face; 22. a second composite pole bearing frame; 3. a second pole post hole; 4. a safety valve; 5. a top cover light panel; 6. a liquid injection hole; 7. a lower injection molding bracket; 71. pole hole I; 72. a lower injection molding through hole; 8. a plastic part; 9. a pole connecting assembly; 91. a first pole connecting sheet; 92. a second composite pole connecting sheet; 10. an epoxy board; 11. a first battery roll core; 12. a second battery roll core; 13. an aluminum shell.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.
Example 1
As shown in fig. 1-2, the embodiment provides a lithium battery top cap assembly, which includes a first pole post 1, a second composite pole post assembly 2, a second pole post hole 3, a safety valve 4, and a top cap light plate 5, where the first pole post 1, the safety valve 4, and the second pole post hole 3 are disposed on the top cap light plate 5 and are integrally formed by stamping the top cap light plate 5, the second composite pole post assembly 2 includes a second composite pole post 21 and a second composite pole post carrier frame 22, and the second composite pole post 21 is fixed in the second pole post hole 3 through the second composite pole post carrier frame 22.
In this embodiment, first utmost point post 1, relief valve 4 and second utmost point post hole 3 on the top cap worn-out fur piece 5 are by stamping equipment one-time stamping forming, and the nick of relief valve 4 is formed by the direct punching press of stamping workpiece, and the frame of the compound utmost point post bearer frame 22 of second bears the compound utmost point post 21 of second to in fixed the compound utmost point post hole 3 of second with the compound utmost point post 21 of second, prevent that the compound utmost point post 21 of second from stopping the commentaries on classics because of receiving the torsion rotation. The second composite post 21 is formed by direct injection molding without a seal ring structure.
As shown in fig. 1-2, in an alternative embodiment, the top cover light plate 5 is provided with a liquid injection hole 6 formed by punching and integral molding, and the liquid injection hole 6 is positioned at one side of the second pole hole 3. Annotate liquid hole 6 and first utmost point post 1, relief valve 4 and second utmost point post hole 3 and by stamping equipment one-time stamping forming, through annotating liquid hole 6, can inject electrolyte into the battery.
As shown in fig. 1-2, in an alternative embodiment, the injection molding device further includes a lower injection molding bracket 7, and the lower injection molding bracket 7 is provided with a first pole hole 71 matched with the second pole hole 3, and a lower injection molding through hole 72 matched with the injection hole 6. The lower injection molding support 7 is arranged below the top cover light plate 5, the lower injection molding support 7 is used for supporting and fixing the top cover light plate 5, the liquid injection hole 6 and the lower injection molding through hole 72 jointly form a channel for injecting electrolyte into the power battery, and the first pole post hole 71 and the second pole post hole 3 jointly form a channel for fixing the second composite pole post 21.
As shown in fig. 1-2, in an alternative embodiment, a plastic part 8 is disposed between the first pole post 1 and the lower injection-molded bracket 7, and is used for filling the inner space of the first pole post 1. The plastic part 8 is formed by compounding resin PPS, PBT, PC, PPA and PA materials. The cavity below the first pole 1 is filled with a plastic part 8. The working of plastics 8 plays sealed, insulating, connect and effect such as splines, also plays the effect of connecting top cap worn-out fur 5 and first utmost point post 1.
As shown in fig. 1-2, in an optional embodiment, the battery further includes a pole connecting assembly 9 for connecting a battery core tab of the battery, the pole connecting assembly 9 includes a first pole connecting piece 91 and a second composite pole connecting piece 92, a surface of the first pole connecting piece 91 is fixedly connected to a bottom surface of the lower injection molding support 7 corresponding to the first pole 1, and a surface of the second pole connecting piece 92 is fixedly connected to a bottom surface of the lower injection molding support 7 corresponding to the second composite pole assembly 2. The surface of the first pole connecting piece 91 is fixedly connected with the bottom surface of the lower injection molding support 7 corresponding to the first pole 1 through laser welding, and the surface of the second pole connecting piece 92 is fixedly connected with the bottom surface of the lower injection molding support 7 corresponding to the second composite pole assembly 2 through laser welding, so that the electric connection between the pole connecting assembly 9 and the positive and negative pole lugs of the battery core is realized.
As shown in fig. 1-2, in an alternative embodiment, an epoxy resin plate 10 is disposed below the first pole connecting piece 91. The cavity inside the first pole column 1 is fixed with the epoxy resin plate 10 through the buckle and the plastic part 8 by filling the plastic part 8, and the fixed insulating epoxy resin plate 10 can play a role in protecting the first pole column 1.
As shown in fig. 1-2, in an alternative embodiment, the material of the side wall surface 211 of the second composite post 21 is copper, and the material of the top end surface 212 of the second composite post 21 is aluminum. The side wall surface 211 of the second composite pole 21 is made of copper, the top end surface 212 is made of aluminum, and the side wall surface 211 and the top end surface 212 are connected through thermal compounding. The thermal composite piece improves the stability and reliability of the copper-aluminum interface.
As shown in fig. 1-2, in an alternative embodiment, the height and shape of the first pole 1 formed by stamping are the same as the height and shape of the second composite pole 21. Adopt stamping equipment to carry out the punching press to first utmost point post 1, the height and the shape of first utmost point post 1 stamping forming are unanimous with the height and the shape that the compound utmost point post 21 of second was moulded plastics and is formed, and first utmost point post 1 and the symmetry of the compound utmost point post 21 of second set up on top cap worn-out fur piece 5.
Example 2
As shown in fig. 1, the present embodiment provides a lithium battery, including the lithium battery top cap assembly according to any one of the technical solutions of embodiment 1, further including a first battery roll core 11, a second battery roll core 12 and an aluminum shell casing 13, a tab of the first battery roll core 11 is ultrasonically and electrically connected to the first pole connecting sheet 91, a tab of the second battery roll core 12 is ultrasonically and electrically connected to the second pole connecting sheet 92, and the aluminum shell casing 13 is used for being assembled into the first battery roll core 11 and the second battery roll core 12.
In this embodiment, the first battery winding core 11 and the second battery winding core 12 are installed in the aluminum shell 13, the first pole connecting sheet 91 and the first battery winding core 11 are used for ultrasonically welding the pole ear inside the lithium battery top cover assembly, and the second pole connecting sheet 92 and the second battery winding core 12 are used for ultrasonically welding the pole ear, so that the lithium battery top cover assembly is electrically connected with the battery cell. After the electric connection is completed, the top cover light plate 5 and the aluminum shell 13 are sealed through laser welding, and the laser welding sealing can ensure that the aluminum shell 13 and the lithium battery top cover assembly are connected and sealed.
Example 3
The present embodiment provides a method for manufacturing a lithium battery top cover assembly, including the lithium battery top cover assembly according to any one of the technical solutions in embodiment 1, including:
(1) the top cover light plate 5 is punched by punching equipment at one time to form a first pole 1, a safety valve 4, a second pole hole 3 and a liquid injection hole 6;
(2) and (3) annealing the integrally punched and formed top cover light plate 5 at a high temperature of 400 ℃ for 45min to ensure that the valve pressure range of the safety valve 4 is 0.6-1.2 MPa.
The preparation method of the lithium battery top cover component in the embodiment relates to a heat treatment process, namely, the integrally punched and formed top cover light plate 5 is subjected to high-temperature annealing treatment at the temperature of 400 ℃ for 45min, so that the valve pressure range of a safety valve 4 punched and formed on the top cover light plate 5 is increased from 0.6MPa to 0.9MPa to 0.6MPa to 1.2MPa, the increase of the valve pressure range can prevent the accumulation of thermal runaway risks caused by the failure of the safety valve 4, and the thermal runaway of a battery cell is reduced, so that the concentrated release of heat caused by the simultaneous opening of the valve is caused, and the risks such as battery damage are caused. To a certain extent, the surface of the safety valve 4 is ensured to be stress-free and can keep good deformation.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A lithium battery top cap subassembly which characterized in that: including first utmost point post, the compound utmost point post subassembly of second, second utmost point post hole, relief valve and top cap worn-out fur, first utmost point post, relief valve and second utmost point post hole set up on the top cap worn-out fur, by top cap worn-out fur punching press integrated into one piece, the compound utmost point post subassembly of second includes injection moulding's the compound utmost point post of second and the compound utmost point post carriage of second, the compound utmost point post of second is fixed in through the compound utmost point post carriage of second the second is downthehole.
2. The lithium battery cap assembly of claim 1, wherein: and the top cover light plate is provided with a stamping and integrally-formed liquid injection hole which is positioned on one side of the second pole hole.
3. The lithium battery cap assembly of claim 2, wherein: the lower injection molding support is provided with a first pole column hole matched with the second pole column hole and a lower injection molding through hole matched with the injection hole.
4. The lithium battery cap assembly of claim 3, wherein: and a plastic part is arranged between the first pole and the lower injection molding support and used for filling the inner space of the first pole.
5. The lithium battery cap assembly of claim 4, wherein: still include utmost point post coupling assembling for connect the electric core utmost point ear of battery, utmost point post coupling assembling includes first utmost point post connection piece and the compound utmost point post connection piece of second, first utmost point post connection piece surface with the support bottom surface fixed connection is moulded to the face of making a bet that first utmost point post corresponds, second utmost point post connection piece surface with the support bottom surface fixed connection is moulded to the face of making a bet that the compound utmost point post subassembly of second corresponds.
6. The lithium battery cap assembly of claim 5, wherein: and an epoxy resin plate is arranged below the first pole connecting sheet.
7. The lithium battery cap assembly of claim 1, wherein: the side wall surface of the second composite pole is made of copper, and the top end surface of the second composite pole is made of aluminum.
8. The lithium battery cap assembly of claim 1, wherein: the height and the shape of the punch forming of the first pole are consistent with those of the second composite pole.
9. A lithium battery, characterized in that: the lithium battery top cover assembly comprises the lithium battery top cover assembly of any one of claims 1-8, and further comprises a first battery roll core, a second battery roll core and an aluminum shell, wherein the aluminum shell is used for being filled with the first battery roll core and the second battery roll core, the lug of the first battery roll core is electrically connected with the first pole connecting sheet in an ultrasonic mode, and the lug of the second battery roll core is electrically connected with the second pole connecting sheet in an ultrasonic mode.
10. A preparation method of a lithium battery top cover assembly is characterized by comprising the following steps: a lithium battery top cap assembly including the lithium battery top cap assembly of any of claims 1-8, comprising:
(1) stamping the top cover light plate by stamping equipment at one time to form a first pole, a safety valve, a second pole hole and a liquid injection hole;
(2) and (3) carrying out high-temperature annealing treatment on the integrally punched and formed top cover light plate at the temperature of 300-500 ℃, and keeping the temperature for 30-60min to ensure that the valve pressure range of the safety valve is 0.6-1.2 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011123193.1A CN112421154A (en) | 2020-10-20 | 2020-10-20 | Lithium battery top cover assembly, lithium battery and preparation method of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011123193.1A CN112421154A (en) | 2020-10-20 | 2020-10-20 | Lithium battery top cover assembly, lithium battery and preparation method of lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112421154A true CN112421154A (en) | 2021-02-26 |
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| CN202011123193.1A Pending CN112421154A (en) | 2020-10-20 | 2020-10-20 | Lithium battery top cover assembly, lithium battery and preparation method of lithium battery |
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| CN (1) | CN112421154A (en) |
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| CN113410554A (en) * | 2021-06-09 | 2021-09-17 | 深圳市长盈精密技术股份有限公司 | Power battery top cap and power battery |
| CN114156608A (en) * | 2021-12-03 | 2022-03-08 | 合肥国轩高科动力能源有限公司 | Multi-winding-core structure of lithium battery and assembling method thereof |
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| CN114156608B (en) * | 2021-12-03 | 2024-03-12 | 合肥国轩高科动力能源有限公司 | Multi-winding core structure of lithium battery and assembly method thereof |
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Application publication date: 20210226 |