CN117954751A - Novel secondary battery top cap subassembly and secondary battery - Google Patents
Novel secondary battery top cap subassembly and secondary battery Download PDFInfo
- Publication number
- CN117954751A CN117954751A CN202410357591.1A CN202410357591A CN117954751A CN 117954751 A CN117954751 A CN 117954751A CN 202410357591 A CN202410357591 A CN 202410357591A CN 117954751 A CN117954751 A CN 117954751A
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- China
- Prior art keywords
- sealing
- ring
- mounting
- secondary battery
- top cover
- 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.)
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- 238000007789 sealing Methods 0.000 claims abstract description 106
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 20
- 238000001125 extrusion Methods 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000004880 explosion Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention discloses a novel secondary battery top cover assembly and a secondary battery, wherein the top cover assembly comprises a top cover plate, lower plastic, a positive pole assembly and a negative pole assembly; the negative pole column component comprises a negative pole rivet, a negative pole upper plastic, a negative pole riveting block, a negative pole switching piece and a first sealing component, wherein the negative pole upper plastic is provided with a mounting groove for mounting the negative pole riveting block, and the negative pole riveting block, the top cover piece, the lower plastic and the negative pole switching piece are provided with fixing holes matched with the negative pole rivet; the first sealing assembly comprises a mounting ring and a first sealing ring, a first fixing groove for mounting the first sealing ring is formed in the outer circumferential surface of the mounting ring, and a second fixing groove for mounting the mounting ring is formed in the negative rivet. According to the invention, the first sealing component is arranged in the negative pole column component, when the battery heats in the working process, the mounting ring in the first sealing component can radially deform, and the first sealing ring is radially extruded, so that the first sealing ring can provide a better sealing effect, and leakage is prevented.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a novel secondary battery top cover assembly and a secondary battery.
Background
In modern society, more and more electric tools and new energy vehicles are driven by power sources, and batteries are widely used in the electric tools and the new energy vehicles due to their excellent characteristics such as high capacity and high safety. These batteries should have good safety in addition to high capacity to meet the standards of use and to meet the needs of people. Secondary batteries generally include a battery cell, a battery case accommodating the battery cell, a top cap assembly sealingly mounted on the battery case, and an electrolyte poured into the battery case.
The top cover assembly comprises a cover plate, a pole column and the like, wherein the pole column is arranged on the cover plate, and the top cover assembly has a great influence on the safety of the battery. Good sealing performance is required between the cover plate and the pole of the top cover assembly so as to prevent air, moisture and the like from entering the battery and prevent electrolyte in the battery from leaking; meanwhile, the stability of connection between the pole and the cover plate is ensured, and the safety risk that external moisture enters the battery and electrolyte leaks due to loosening of the connection between the pole and the cover plate under the action of external force is prevented, so that the safety of the battery is ensured.
Because the battery can generate heat in the working process, the pressure of gas in the battery can become large along with the temperature rise, and after the air pressure rises, the sealing ring in the pole assembly is more easy to leak.
Disclosure of Invention
The invention aims to solve the problems that: the utility model provides a novel secondary cell top cap subassembly and secondary cell, through set up seal assembly one in the negative pole post subassembly, when the battery generates heat in the course of the work, the collar in seal assembly one can take place radial deformation, carries out radial extrusion to sealing washer one, makes sealing washer one can provide better sealed effect to prevent the emergence of leakage.
The technical scheme provided by the invention for solving the problems is as follows: a novel secondary battery top cover assembly comprises a top cover plate, lower plastic and a positive pole column assembly and a negative pole column assembly which are respectively arranged at two sides of the top cover plate; the negative pole column component comprises a negative pole rivet, a negative pole upper plastic, a negative pole riveting block, a negative pole switching piece and a first sealing component, wherein the negative pole upper plastic is provided with an installation groove for installing the negative pole riveting block, and the negative pole riveting block, the top cover plate, the lower plastic and the negative pole switching piece are provided with fixing holes matched with the negative pole rivet;
The first sealing assembly comprises a mounting ring and a first sealing ring, the mounting ring is made of a titanium alloy memory material, a first fixing groove for mounting the first sealing ring is formed in the outer circumferential surface of the mounting ring, and a second fixing groove for mounting the mounting ring is formed in the negative rivet.
Preferably, the positive pole post assembly comprises a positive pole block, a plastic and a positive pole rotating sheet, wherein the positive pole block is provided with a first step and a second step, one end of the top cover sheet is provided with a groove, the groove of the top cover sheet and the positive pole rotating sheet are provided with mounting holes for mounting the positive pole block, the first step is welded with the mounting holes of the top cover sheet by laser, and the second step is welded with the mounting holes of the positive pole rotating sheet by laser.
Preferably, the lower plastic is arranged at the lower end of the top cover plate, and the upper positive electrode is connected with the upper end of the positive electrode block in a clamping manner.
Preferably, the positive electrode block, the first step and the second step are circular or square.
Preferably, the anti-explosion sealing device further comprises an integrated sealing structure, wherein the integrated sealing structure comprises an anti-explosion valve plate, a sealing nail and a sealing assembly II; the sealing nail is provided with an axial through hole and a welding groove, the welding groove is arranged at the upper part of the through hole, and the anti-explosion valve plate is welded in the welding groove and blocks the through hole; and the second sealing component is arranged on the sealing nail and used for sealing the installation gap between the sealing nail and the liquid injection hole on the top cover plate.
Preferably, the second sealing component comprises a second sealing ring, a driving ring and an extrusion ring; the second sealing ring is used for sealing an installation gap between the sealing nail and the liquid injection hole on the top cover plate, the driving ring is made of a titanium alloy memory material, when the temperature in the battery rises to reach the deformation temperature of the thermally-induced telescopic material, the driving ring deforms to drive the extrusion ring to extrude the second sealing ring, and therefore the sealing effect of the second sealing ring is improved.
Preferably, the sealing nail is provided with a first annular installation cavity for installing a second sealing ring and a second annular installation cavity for installing a driving ring, the first annular installation cavity is communicated with the second annular installation cavity through a third annular installation cavity, and the extrusion ring is installed in the third annular installation cavity.
Preferably, one side of the extrusion ring, which is away from the second sealing ring, is provided with a first inclined surface, and the end surface of the annular mounting cavity III, which is matched with the first inclined surface, is provided with a second inclined surface.
Preferably, a protective sheet is arranged at the upper end of the welding groove.
The invention also discloses a secondary battery, which comprises the novel secondary battery top cover assembly.
Compared with the prior art, the invention has the advantages that: according to the invention, the first sealing component is arranged in the negative pole column component, when the battery heats in the working process, the mounting ring in the first sealing component can radially deform, and the first sealing ring is radially extruded, so that the first sealing ring can provide a better sealing effect, and leakage is prevented.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
FIG. 4 is an enlarged schematic view at B in FIG. 2;
fig. 5 is an enlarged schematic view at C in fig. 2.
The drawings are marked: 1. the top cover plate, 2, the liquid injection hole, 3, the plastic on the negative electrode, 4, the negative electrode riveting block, 5, the negative electrode switching piece, 6, the lower plastic, 7, the positive electrode switching piece, 8, the plastic on the positive electrode, 9, the positive electrode block, 10, the first step, 11, the second step, 12, the protection piece, 13, the welding groove, 14, the sealing nail, 15, the annular mounting cavity III, 16, the sealing ring II, 17, the extrusion ring, 18, the driving ring, 19, the annular mounting cavity II, 20, the through hole, 21, the first notch ring, 22, the explosion-proof valve plate, 23, the second notch ring, 24, the top ring, 25, the negative electrode rivet, 26, the sealing ring I, 27 and the mounting ring.
Detailed Description
The following detailed description of embodiments of the present invention will be given with reference to the accompanying drawings and examples, by which the implementation process of how the present invention can be applied to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Example 1
The embodiment discloses a novel top cover assembly of a secondary battery, which comprises a top cover plate 1, lower plastic 6, and a positive pole column assembly and a negative pole column assembly which are respectively arranged at two sides of the top cover plate 1; the negative electrode column assembly comprises a negative electrode rivet 25, a negative electrode upper plastic 3, a negative electrode riveting block 4, a negative electrode switching piece 5 and a first sealing assembly, wherein the negative electrode upper plastic 3 is provided with a mounting groove for mounting the negative electrode riveting block 4, and the negative electrode riveting block 4, the top cover plate 1, the lower plastic 6 and the negative electrode switching piece 5 are provided with fixing holes matched with the negative electrode rivet 25;
as shown in fig. 5, the first sealing assembly includes a first mounting ring 27 and a first sealing ring 26, the mounting ring 27 is made of a titanium alloy memory material, a first fixing groove for mounting the first sealing ring 26 is formed on an outer circumferential surface of the mounting ring 27, and a second fixing groove for mounting the mounting ring 27 is formed on the negative rivet 25.
In this embodiment, specifically, as shown in fig. 3, the positive pole post assembly includes a positive pole block 9, a plastic 8 on the positive pole and a positive pole switching piece 7, the positive pole block 9 is provided with a first step 10 and a second step 11, one end of the top cover piece 1 is provided with a groove, mounting holes for mounting the positive pole block 9 are all provided in the groove of the top cover piece 1 and on the positive pole switching piece 7, the first step 10 is welded with the mounting holes on the top cover piece 1 by laser, and the second step 11 is welded with the mounting holes on the positive pole switching piece 7 by laser. Further, the lower plastic 6 is installed at the lower end of the top cover plate 1, and the upper positive plastic 8 is clamped at the upper end of the positive electrode block 9.
The positive electrode block 9, the first step 10, and the second step 11 are circular or square.
As shown in fig. 4, the embodiment further includes an integral sealing structure, where the integral sealing structure includes an explosion-proof valve plate 22, a sealing nail 14, and a sealing component two; the sealing nail 14 is provided with an axial through hole 20 and a welding groove 13, the welding groove 13 is arranged at the upper part of the through hole 20, and the anti-explosion valve plate 22 is welded in the welding groove 13 and blocks the through hole 20; the second sealing component is arranged on the sealing nail 14 and is used for sealing the installation gap between the sealing nail 14 and the liquid injection hole 2 on the top cover plate 1. Specifically, the second sealing component comprises a second sealing ring 16, a driving ring 18 and an extrusion ring 17; the second sealing ring 16 is used for sealing the installation gap between the sealing nail 14 and the liquid injection hole 2 on the top cover plate 1, the driving ring 18 is made of a titanium alloy memory material, when the temperature in the battery rises to reach the deformation temperature of the thermally-induced telescopic material, the driving ring 18 deforms to drive the extrusion ring 17 to extrude the second sealing ring 16, and therefore the sealing effect of the second sealing ring 16 is improved. After the sealing nails 14 are arranged in the liquid injection holes 2, the contact surfaces of the nail caps of the sealing nails 14 and the top cover sheet 1 are welded, so that the sealing nails 14 are fixed; further, the sealing nail 14 is provided with a first annular installation cavity for installing a second sealing ring 16 and a second annular installation cavity 19 for installing a driving ring 18, the first annular installation cavity is communicated with the second annular installation cavity 19 through a third annular installation cavity 15, and the extruding ring 17 is installed in the third annular installation cavity 15. The extrusion ring 17 is made of flexible materials, and when the driving ring 18 extrudes the extrusion ring 17, the extrusion ring 17 can deform radially to a certain extent.
One side of the extrusion ring 17, which faces away from the second sealing ring 16, is provided with a first inclined surface, and an end surface of the third annular mounting cavity 15, which is matched with the first inclined surface, is provided with a second inclined surface.
In the above scheme, when the internal temperature of the battery rises to reach the deformation temperature of the heat-induced telescopic material, the driving ring 18 axially deforms to drive the extrusion ring 17 to extrude the second sealing ring 16 so as to improve the sealing effect of the second sealing ring 16, and the axial deformation lengths of the driving ring 18 are different under different temperature conditions, so that the structure can adjust the sealing effect according to the difference of the internal temperature of the battery and prevent the second sealing ring 16 from being in great deformation for a long time and fatigue failure.
The anti-explosion valve plate 22 is provided with a first notch ring 21 and a second notch ring 23, and the first notch ring 21 and the second notch ring 23 are respectively arranged on the upper end face and the lower end face of the anti-explosion valve plate 22. Further, in this embodiment, the integrated sealing structure further includes an explosion-proof safety component, and when the temperature in the battery rises to the set value, the explosion-proof safety component pushes the first score ring 21 open so that the air pressure in the battery can be released. The explosion-proof safety assembly comprises an ejector ring 24, wherein the ejector ring 24 is arranged in the through hole 20, the lower end face of the ejector ring 24 is in contact with the upper end face of the driving ring 18, and the upper end face of the ejector ring 24 corresponds to the first notch ring 21.
Through setting up nick circle one 21 and nick circle two 23 on the surface of explosion-proof valve block 22, when battery internal pressure risees sharply, explosion-proof valve block 22 central point puts and begins to rise to warp, when warp to a certain extent, explosion-proof valve block 22 can explode along nick circle one 21 and nick circle two 23, make the inside atmospheric pressure of battery release, because operational environment or the problem of machining precision, two nick circles probably appear the circumstances of inefficacy, namely rise to the setting as battery internal temperature rising pressure, two nick circles can not explode smoothly, in the above-mentioned scheme, when battery internal temperature reaches the setting, corresponding axial deformation takes place for actuating ring 18, drive top open loop 24 upward movement and jack up nick circle one 21, the gas can obtain in time revealing, holistic security has been promoted. The scheme can also make the explosion-proof valve block 22 timely burst to release pressure when two nick rings fail while achieving the sealing effect of the adjusting sealing ring through the driving ring 18.
In this embodiment, in order to protect the explosion proof valve plate 22, a protection plate 12 is provided at the upper end of the welding groove 13.
It should be noted that, in this embodiment, the mounting ring 27 is radially deformed after being heated, the driving ring 18 is axially deformed after being heated, and the deformation lengths of the mounting ring 27 and the driving ring 18 are adjusted along with the temperature under different temperature conditions.
Example 2
This embodiment discloses a secondary battery including a novel secondary battery top cap assembly as described in embodiment 1; in this embodiment, it should be noted that, the remaining structural components of the secondary battery in this embodiment belong to the prior art, and those skilled in the art can design the secondary battery according to needs, which will not be described in detail in this embodiment.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. A novel secondary battery top cover assembly comprises a top cover plate (1), lower plastic (6) and a positive pole assembly and a negative pole assembly which are respectively arranged at two sides of the top cover plate (1); the method is characterized in that: the negative electrode column assembly comprises a negative electrode rivet (25), a negative electrode upper plastic (3), a negative electrode riveting block (4), a negative electrode switching piece (5) and a first sealing assembly, wherein an installation groove for installing the negative electrode riveting block (4) is formed in the negative electrode upper plastic (3), and fixing holes matched with the negative electrode rivet (25) are formed in the negative electrode riveting block (4), the top cover piece (1), the lower plastic (6) and the negative electrode switching piece (5);
The first sealing assembly comprises a mounting ring (27) and a first sealing ring (26), the mounting ring (27) is made of a titanium alloy memory material, a first fixing groove for mounting the first sealing ring (26) is formed in the outer circumferential surface of the mounting ring (27), and a second fixing groove for mounting the mounting ring (27) is formed in the negative rivet (25).
2. The novel secondary battery top cap assembly according to claim 1, wherein: the positive pole post assembly comprises a positive pole block (9), a plastic (8) and a positive pole rotating sheet (7), wherein the positive pole block (9) is provided with a first step (10) and a second step (11), one end of the top cover sheet (1) is provided with a groove, mounting holes for mounting the positive pole block (9) are formed in the groove of the top cover sheet (1) and the positive pole rotating sheet (7), the first step (10) is subjected to laser welding with the mounting holes on the top cover sheet (1), and the mounting holes on the second step (11) and the positive pole rotating sheet (7) are subjected to laser welding.
3. The novel secondary battery top cap assembly according to claim 2, wherein: the lower plastic (6) is arranged at the lower end of the top cover plate (1), and the upper positive plastic (8) is clamped at the upper end of the positive electrode block (9).
4. The novel secondary battery top cap assembly according to claim 2, wherein: the positive electrode block (9), the first step (10) and the second step (11) are round or square.
5. The novel secondary battery top cap assembly according to claim 1, wherein: the sealing structure also comprises an integrated sealing structure, wherein the integrated sealing structure comprises an anti-explosion valve plate (22), a sealing nail (14) and a second sealing assembly; the sealing nail (14) is provided with an axial through hole (20) and a welding groove (13), the welding groove (13) is arranged at the upper part of the through hole (20), and the anti-explosion valve plate (22) is welded in the welding groove (13) and blocks the through hole (20); the second sealing component is arranged on the sealing nail (14) and is used for sealing an installation gap between the sealing nail (14) and the liquid injection hole (2) on the top cover sheet (1).
6. The novel secondary battery top cap assembly according to claim 5, wherein: the second sealing component comprises a second sealing ring (16), a driving ring (18) and an extrusion ring (17); the second sealing ring (16) is used for sealing an installation gap between the sealing nail (14) and the liquid injection hole (2) in the top cover sheet (1), the driving ring (18) is made of a titanium alloy memory material, when the temperature in the battery rises to reach the deformation temperature of the thermally-induced telescopic material, the driving ring (18) deforms to drive the extrusion ring (17) to extrude the second sealing ring (16), and therefore the sealing effect of the second sealing ring (16) is improved.
7. The novel secondary battery top cap assembly according to claim 6, wherein: the sealing nail (14) is provided with a first annular mounting cavity for mounting a second sealing ring (16) and a second annular mounting cavity (19) for mounting a driving ring (18), the first annular mounting cavity is communicated with the second annular mounting cavity (19) through a third annular mounting cavity (15), and the extruding ring (17) is mounted in the third annular mounting cavity (15).
8. The novel secondary battery top cap assembly according to claim 7, wherein: one side of the extrusion ring (17) deviating from the second sealing ring (16) is provided with a first inclined surface, and the end surface of the third annular mounting cavity (15) matched with the first inclined surface is provided with a second inclined surface.
9. The novel secondary battery top cap assembly according to claim 5, wherein: the upper end of the welding groove (13) is provided with a protection sheet (12).
10. A secondary battery characterized in that: a novel secondary battery top cap assembly comprising the above-described structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410357591.1A CN117954751B (en) | 2024-03-27 | 2024-03-27 | Secondary cell top cap subassembly and secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410357591.1A CN117954751B (en) | 2024-03-27 | 2024-03-27 | Secondary cell top cap subassembly and secondary cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117954751A true CN117954751A (en) | 2024-04-30 |
| CN117954751B CN117954751B (en) | 2024-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410357591.1A Active CN117954751B (en) | 2024-03-27 | 2024-03-27 | Secondary cell top cap subassembly and secondary cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117954751B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007328991A (en) * | 2006-06-07 | 2007-12-20 | Nec Tokin Corp | Sealed type battery |
| CN203871389U (en) * | 2014-04-04 | 2014-10-08 | 深圳市科达利实业股份有限公司 | Power battery cover plate and baseplate thereof |
| JP2016134333A (en) * | 2015-01-21 | 2016-07-25 | トヨタ自動車株式会社 | Nonaqueous electrolyte secondary battery |
| KR20200069120A (en) * | 2018-12-06 | 2020-06-16 | 주식회사 엘지화학 | Cylindrical Secondary Battery |
| CN213989016U (en) * | 2020-12-14 | 2021-08-17 | 厦门海辰新能源科技有限公司 | Lower plastic, battery top cap and power battery |
| CN115312929A (en) * | 2022-10-12 | 2022-11-08 | 深圳海润新能源科技有限公司 | Top cover assembly, battery and preparation method of battery |
| CN219163538U (en) * | 2022-12-28 | 2023-06-09 | 三一红象电池有限公司 | Top cap subassembly, battery and battery module |
| CN220021350U (en) * | 2023-06-14 | 2023-11-14 | 江苏正力新能电池技术有限公司 | Battery top cover and battery |
-
2024
- 2024-03-27 CN CN202410357591.1A patent/CN117954751B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007328991A (en) * | 2006-06-07 | 2007-12-20 | Nec Tokin Corp | Sealed type battery |
| CN203871389U (en) * | 2014-04-04 | 2014-10-08 | 深圳市科达利实业股份有限公司 | Power battery cover plate and baseplate thereof |
| JP2016134333A (en) * | 2015-01-21 | 2016-07-25 | トヨタ自動車株式会社 | Nonaqueous electrolyte secondary battery |
| KR20200069120A (en) * | 2018-12-06 | 2020-06-16 | 주식회사 엘지화학 | Cylindrical Secondary Battery |
| CN213989016U (en) * | 2020-12-14 | 2021-08-17 | 厦门海辰新能源科技有限公司 | Lower plastic, battery top cap and power battery |
| CN115312929A (en) * | 2022-10-12 | 2022-11-08 | 深圳海润新能源科技有限公司 | Top cover assembly, battery and preparation method of battery |
| CN219163538U (en) * | 2022-12-28 | 2023-06-09 | 三一红象电池有限公司 | Top cap subassembly, battery and battery module |
| CN220021350U (en) * | 2023-06-14 | 2023-11-14 | 江苏正力新能电池技术有限公司 | Battery top cover and battery |
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| Publication number | Publication date |
|---|---|
| CN117954751B (en) | 2024-05-31 |
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