CN112290133A - Secondary battery top cover and assembling method thereof, and secondary battery - Google Patents
Secondary battery top cover and assembling method thereof, and secondary battery Download PDFInfo
- Publication number
- CN112290133A CN112290133A CN202011290950.4A CN202011290950A CN112290133A CN 112290133 A CN112290133 A CN 112290133A CN 202011290950 A CN202011290950 A CN 202011290950A CN 112290133 A CN112290133 A CN 112290133A
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- secondary battery
- top cover
- top cap
- piece
- riveting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- 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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a secondary battery top cover and an assembly method thereof, and a secondary battery, wherein the secondary battery top cover comprises a top cover plate, a negative pole column and a riveting sheet fixed on the negative pole column, the top cover plate is provided with a first mounting hole, the negative pole column penetrates through and is mounted in the first mounting hole in an insulating way, the riveting sheet is insulated from the top cover plate through a first insulating piece, the negative pole column comprises a body penetrating through the first mounting hole and a boss part which is positioned at the lower part of the top cover plate and is insulated from the top cover plate, the top cover plate and the body are insulated through a sealing piece, the middle part of the body is provided with a groove with an upward opening, the upper part of the body is riveted with the riveting sheet through deformation generated by the peripheral wall of the groove under the extrusion of external force, and the. The upper part of the body is extruded by external force through the peripheral wall of the groove to deform and be riveted with the riveting sheet, the lower part of the body can be abutted against the sealing element in the horizontal direction through the extrusion of the external force through the peripheral wall of the groove, and the sealing element is sealed in the horizontal direction through acting force applied in the horizontal direction.
Description
Technical Field
The invention relates to the field of energy storage instruments, in particular to a secondary battery top cover and an assembling method thereof, and a secondary battery.
Background
With the development of modern society and the enhancement of environmental awareness of people, more and more driving power supplies of electric tools and new energy vehicles develop towards the directions of high capacity and high safety, which provides a wide space for the application and development of lithium secondary batteries.
General secondary battery, utmost point post needs to be electrically insulated with top cap piece and casing, therefore can set up numerous insulating assemblies, if go up plastic part with negative pole post and top cap piece insulation, arrange negative pole mounting hole in and carry out electrically insulated and sealed sealing member, and carry out the lower plastic part of electrically insulated with negative pole post lower extreme or negative pole connection piece and top cap piece, these subassemblies are when carrying out the installation of top cap piece and negative pole post, in order to strictly control its gas tightness, the required precision of its installation is very high, both will carry out the pre-compaction to the sealing member, again will strictly control the clearance between each part, therefore with high costs and yields is low. The sealing member is usually compressed in the vertical direction when carrying out the pre-compaction, carries out vertical compression promptly, because numerous insulating assemblies's on the secondary cell top cap setting for the pre-compaction operation is more difficult, and in addition, in order to satisfy the frivolous requirement of battery at present, the top cap piece sets up more and more thinly, and its intensity also is descending, makes the top cap piece take place deformation when carrying out the pre-compaction to the sealing member on the top cap piece easily, and influences the performance of secondary cell top cap.
Disclosure of Invention
The invention aims to provide a novel secondary battery top cover which can horizontally press a sealing element to realize sealing and avoid the influence on the service performance of a secondary battery caused by the traditional vertical pressing.
In order to achieve the above object, a first aspect of the present invention provides a secondary battery top cap for hermetically accommodating a casing of a battery cell, including a top cap plate, a negative pole post, and a rivet plate fixed to the negative pole post, wherein the top cap plate is provided with a first mounting hole, the negative pole post is inserted into and insulated from the first mounting hole, the rivet plate is insulated from the top cap plate by a first insulating member, the negative pole post includes a body inserted into the first mounting hole and a boss portion located at a lower portion of the top cap plate and insulated from the top cap plate, the top cap plate and the body are insulated by a sealing member, a groove with an upward opening is provided in a middle portion of the body, an upper portion of the body is riveted with the rivet plate by deformation of a peripheral wall of the groove due to external force, and a lower portion of the body abuts against the sealing member in a horizontal direction.
Compared with the prior art, the middle part of the post body of the secondary battery top cover is provided with the groove with the upward opening, and the weight of the secondary battery top cover can be reduced by the arrangement of the groove so as to meet the requirement of lightening and thinning the battery top cover. Meanwhile, the upper part of the body can be riveted with the riveting sheet by means of the deformation of the peripheral wall of the groove due to the extrusion of external force, the lower part of the body can be abutted against the sealing element in the horizontal direction due to the extrusion of external force through the peripheral wall of the groove, the sealing element is sealed in the horizontal direction by the acting force applied in the horizontal direction, and the deformation of the top cover plate due to the traditional pressing in the vertical direction can be avoided, so that the use performance of the secondary battery is influenced.
Furthermore, the upper part of the body is riveted with the riveting sheet to form an extension part formed by extending the peripheral wall of the groove outwards from the opening.
Furthermore, the middle part of riveting piece is equipped with the confession the fixed orifices that the body was worn to establish, the lower part joint of riveting piece in first insulating part, riveting piece and first insulating part joint cooperation can improve the firm nature of connection. Furthermore, the side wall of the lower portion of the riveting piece is concave inwards to form a notch, and the first insulating piece is provided with a protruding portion clamped in the notch.
Further, the lower side of the top cover plate is provided with a second insulating part for insulating the top cover plate and the boss part, the second insulating part is provided with a stepped hole, the body of the negative pole column penetrates through the stepped hole and the boss part is clamped in the stepped hole, and the connection firmness of the negative pole column and the second insulating part is stronger in a clamping mode.
Furthermore, the body is of a hollow cylinder structure before riveting, the inner diameter before riveting is D1, the outer diameter is D2, the inner diameter after riveting is D3, the outer diameter is D4, D1/D3 is 0.5-0.9, and D2-D1 is 0.1-10 mm.
Furthermore, the sealing element is of a circular ring structure, the wall thickness of the sealing element in the horizontal direction before riveting of the body is L1, the wall thickness of the sealing element in the horizontal direction after riveting is L2, and the L2/L1 is 0.55-0.85.
A second aspect of the present invention provides a secondary battery top cap assembling method, comprising the steps of:
(1) sleeving a sealing element on a body of the negative pole, connecting a top cover plate by the sealing element, sleeving a riveting sheet above the body, isolating the riveting sheet from the top cover plate by a first insulating element, and arranging a groove with an upward opening in the middle of the body;
(2) the pressing head with the size larger than that of the groove is adopted to stretch into the groove and apply pressure to the peripheral wall of the groove so that the upper portion of the body deforms and is riveted with the riveting sheet, and the inner diameter and the outer diameter of the body are enlarged so that the sealing element sleeved on the body is compressed and deformed in the horizontal direction and is abutted against the body.
Through the ingenious design of the recess on the body of negative pole post, exert external force to the recess of negative pole post and can rivet with the riveting piece, thereby the recess changes in size under the effect of external force and carries out the compression of horizontal direction with the realization sealing member to the sealing member to avoid traditional sealing member to send the top plate to take place to warp in the pre-compaction of vertical direction.
A third aspect of the present invention provides a secondary battery, including a battery cell, a casing for accommodating the battery cell, and a top cover for sealing the casing, wherein the top cover is the secondary battery top cover assembled by the aforementioned secondary battery top cover or the aforementioned method for assembling the secondary battery top cover.
Drawings
Fig. 1 is a plan view of an embodiment of a top cap for a secondary battery according to the present invention.
Fig. 2 is an exploded view of the top cap of the secondary battery of fig. 1 in one direction.
Fig. 3 is an exploded view of the secondary battery top cover of fig. 1 in another direction.
Fig. 4 is a cross-sectional view taken along a-a of fig. 1.
Fig. 5 is an enlarged view of a portion B in fig. 4.
Fig. 6 is a schematic view before riveting.
Fig. 7 is a schematic view after riveting.
Fig. 8 is an enlarged view of a portion C in fig. 6.
Fig. 9 is an enlarged view of a portion D in fig. 7.
Description of the elements
100-secondary battery top cover; 10-a top cover sheet; 11-a first mounting hole; 13-a second mounting hole; 15-explosion-proof valve hole; 20-positive pole column; 30-a negative pole post; 31-a body; 311-a groove; 33-a boss portion; 35-an extension; 40-an explosion-proof valve assembly; 410-an explosion-proof valve; 430-explosion-proof valve protection sheet; 50-liquid injection hole; 60-riveting sheets; 60 a-positive riveting sheet; 610-fixing holes; 630-notches; 70-a first insulator; 70 a-positive first insulator; 710-a boss; 80-a seal; 80 a-positive seal; 90-a second insulator; 910-a stepped bore; 200-a press; 210-ram
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, in general, the secondary battery is placed vertically, the side of the secondary battery top cover provided with the battery core is the lower side, otherwise, the upper side, and the upper and lower directions are defined as the thickness or height direction.
The secondary battery top cap and the secondary battery according to the present invention will be described with reference to the accompanying drawings.
The secondary battery of the present invention includes a battery cell, a case accommodating the battery cell, and a secondary battery top cap 100 sealing the case. The secondary battery top cover 100 may be welded to and sealed with a case in which a secondary battery electrolyte is injected to infiltrate the battery cell. As shown in fig. 1 to 9, the secondary battery top cap 100 includes a top cap sheet 10, and a positive post 20, a negative post 30, a liquid injection hole 50, and an explosion-proof valve assembly 40 provided on the top cap sheet 10. The top cover plate 1 is provided with a first mounting hole 11, a second mounting hole 13 and an explosion-proof valve mounting hole 15, the first mounting hole 11 is fixed with a negative pole column 30 in an insulating mode, and the second mounting hole 13 is connected with a positive pole column 20. The explosion-proof valve assembly 4 comprises an explosion-proof valve 410 and an explosion-proof valve protection sheet 430, the explosion-proof valve 410 is arranged in the explosion-proof valve mounting hole 15, and the explosion-proof valve protection sheet 430 is arranged above the explosion-proof valve 410. A second insulator 90 is provided below the top cover sheet 1 to electrically insulate the top cover sheet 10 from the cells in the housing.
For convenience of description, the secondary battery top cover 100 of the present invention will be described in detail by taking the negative electrode side as an example. As shown in fig. 1 to 9, the negative pole 30 is fixed with the riveting sheet 60, the riveting sheet 60 is insulated from the top cover plate 10 by the first insulating member 70, the negative pole 30 includes a body 31 penetrating the first mounting hole 11 and a boss 33 located at the lower part of the top cover plate 10 and insulated from the top cover plate, the top cover plate 10 and the body 31 are insulated by the sealing member 80, the middle part of the body 31 is provided with a groove 311 with an upward opening, the upper part of the body 31 is riveted with the riveting sheet 60 by the deformation of the peripheral wall of the groove 311 extruded by external force, and the lower part is abutted against the sealing member 80 in the horizontal direction.
As shown in fig. 2 to 5, the upper portion of the main body 31 is riveted to the rivet piece 60 to form an extending portion 35 formed by extending the peripheral wall of the recess 311 outward from the opening. The middle part of riveting piece 60 is equipped with the fixed orifices 610 that supplies body 31 to wear to establish, and the lower part joint of riveting piece 60 is in first insulator 70, and riveting piece 60 and first insulator 70 joint cooperation can improve the firm nature of connection. The rivet sheet 60 may be recessed in the side wall of the lower portion to form a notch 630, the first insulating member 70 is provided with a protrusion 710 clamped in the notch 630, and the first insulating member 70 may be an injection molded member, and the clamping fit between the first insulating member and the notch is achieved through injection molding.
As shown in fig. 2 to 5, a second insulating member 90 for insulating the top cover sheet 10 from the boss portion 33 is provided below the top cover sheet 10, the second insulating member 90 is provided with a stepped hole 910, the body 31 of the negative pole 30 is inserted into the stepped hole 910, and the boss portion 33 is engaged with the stepped hole 910, so that the connection between the negative pole 30 and the second insulating member 90 is more secure by engagement.
The body 31 of the invention is of a hollow cylinder structure before riveting, the inner diameter before riveting is D1, the outer diameter is D2, the inner diameter after riveting is D3, the outer diameter is D4, D1/D3 is 0.5-0.9, and D2-D1 is 0.1-10 mm. The sealing element 80 is of a circular ring structure, the wall thickness of the sealing element 80 in the horizontal direction before riveting the body 31 is L1, the wall thickness of the sealing element 80 in the horizontal direction after riveting is L2, L2/L1 is 0.55-0.85, and the sealing element 80 has elasticity and is preferably made of rubber.
As shown in fig. 6 to 9, the secondary battery top cover 100 of the present invention may be assembled by a method including the steps of:
(1) sleeving a sealing element 80 on a body 31 of a negative pole 30, connecting the sealing element 80 with a top cover plate 10, sleeving a riveting sheet 60 above the body 31, isolating the riveting sheet 60 from the top cover plate 10 by a first insulating element 70, and arranging a groove 311 with an upward opening in the middle of the body 31;
(2) and pressing the negative pole 31 by using a press machine 200, wherein the size D5 of the pressure head 210 is larger than the inner diameter D1 of the groove 311, the pressure head 210 extends into the groove 311 and applies pressure to the peripheral wall of the groove 311 to deform the upper part of the body 31 so as to rivet the riveting sheet 60, and the inner diameter and the outer diameter of the body 31 are both enlarged so that the sealing element 80 sleeved on the body 31 is compressed and deformed in the horizontal direction and is abutted against the body 31. Wherein, the pressing head 210 is preferably a guide structure with a chamfered or smaller diameter than D3 at the front end.
The positive terminal may have the same structure as the negative terminal, and as shown in fig. 2 to 4, a positive rivet piece 60a is fixed to the positive post 20, the positive rivet piece 60a is insulated from the top cover plate 10 by a positive first insulating member 70a, the positive post 20 is insulated from the top cover plate 10 by a sealing member 80a, the upper portion of the positive post 20 is riveted to the rivet piece 60a by deformation of the peripheral wall of the internal groove due to external force, and the lower portion of the positive post abuts against the sealing member 80a in the horizontal direction. In order to solve the problems of overcharge and puncture of the secondary battery during the use of the secondary battery, the positive electrode post 20 and the top cap sheet 10 are generally electrically connected to form an external short circuit, and thus, when the positive electrode first insulating member 70a is prepared by injection molding, conductive particles, such as conductive carbon or conductive metal, may be added to the positive electrode first insulating member 70a to electrically connect the positive electrode post 20 and the top cap sheet 10. In order to simplify the process, the positive post 20 may be directly welded and fixed to the top cover plate 10, or the top cover plate 10 may be protruded away from the cell to form the positive post 20.
The middle part of the body 31 of the pole of the secondary battery top cover 100 is provided with a groove 311 with an upward opening, and the arrangement of the groove 311 can reduce the weight of the secondary battery top cover 100 so as to meet the requirement of lightening and thinning the battery top cover. Meanwhile, the upper portion of the body 31 is riveted with the riveting sheet 60 by the deformation of the peripheral wall of the groove 311 caused by the external force, the lower portion of the body 311 can abut against the sealing member 80 in the horizontal direction by the external force extrusion of the peripheral wall of the groove 311, the sealing member 80 is sealed in the horizontal direction by the action force applied in the horizontal direction, and the deformation of the top cover plate 10 caused by the traditional vertical direction pressure can be avoided, so that the use performance of the secondary battery is affected.
It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that those skilled in the art will be able to modify the invention in its various equivalent forms after reading the present invention and to fall within the scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a secondary battery top cap (100), a casing for sealed holding electricity core, includes top cap piece (10), negative pole post (30), is fixed in riveting piece (60) of negative pole post (30), first mounting hole (11) have been seted up in top cap piece (10), negative pole post (30) wear to establish and insulating install in first mounting hole (11), riveting piece (60) borrow by first insulating part (70) with top cap piece (10) are insulating, characterized in that, negative pole post (30) are including wearing to establish body (31) of first mounting hole (11) and being located top cap piece (10) lower part and boss portion (33) insulating with it, top cap piece (10) with body (31) are insulating by sealing member (80), the middle part of body (31) is equipped with ascending recess (311) of opening, the upper portion of body (31) borrow the perisporium of recess (311) receive the extrusion and the deformation that takes place with riveting piece (311) and deformation The tab (60) is riveted, and the lower portion thereof abuts against the seal (80) in the horizontal direction.
2. The secondary battery top cap (100) according to claim 1, wherein the rivet piece (60) is riveted to an upper portion of the body (31) to form an extension (35) formed by extending a peripheral wall of the groove (311) outward from an opening.
3. The secondary battery top cap (100) according to claim 1, wherein a fixing hole (610) for the body (31) to pass through is formed in the middle of the rivet piece (60), and the lower portion of the rivet piece (60) is engaged with the first insulating member (70).
4. The secondary battery top cap (100) according to claim 3, wherein the side wall of the lower portion of the rivet piece (60) is recessed to form a notch (630), and the first insulating member (70) is provided with a protrusion (710) which is snapped into the notch (630).
5. The secondary battery top cap (100) according to claim 1, wherein a second insulating member (90) for insulating the top cap sheet (10) and the boss portion (33) is arranged below the top cap sheet (10), the second insulating member (90) is provided with a stepped hole (910), the body (31) of the negative pole post (30) is penetrated through the stepped hole (910), and the boss portion (33) is clamped in the stepped hole (910).
6. The secondary battery top cap (100) according to claim 1, wherein the body (31) has a hollow cylindrical structure before riveting, and has an inner diameter of D1 before riveting, an outer diameter of D2, an inner diameter of D3 after riveting, an outer diameter of D4, and D1/D3 of 0.5-0.9, D2-D1 of 0.1-10 mm.
7. The secondary battery top cap (100) according to claim 1, wherein the sealing member (80) has a circular ring structure, and the sealing member (80) has a wall thickness of L1 in the horizontal direction before the body (31) is caulked, a wall thickness of L2 in the horizontal direction after the caulking is caulked, and L2/L1 is 0.55 to 0.85.
8. A method of assembling a secondary battery top cap (100), comprising the steps of:
(1) sleeving a sealing element (80) on a body (31) of a negative pole (30), connecting the sealing element (80) with a top cover plate (10), sleeving a riveting sheet (60) above the body (10), isolating the riveting sheet (60) with a first insulating element (70) and the top cover plate (10), and arranging a groove (311) with an upward opening in the middle of the body (31);
(2) the pressing head (210) with the size larger than that of the groove (311) is adopted to extend into the groove (311) and apply pressure to the peripheral wall of the groove (311) so as to enable the upper part of the body (31) to deform and rivet with the riveting sheet (60), and the inner diameter and the outer diameter of the body (31) are increased so as to enable the sealing element (80) sleeved on the body (31) to be compressed and deformed in the horizontal direction and abut against the body (31).
9. A secondary battery comprising a battery cell, a casing for accommodating the battery cell, and a top cover for sealing the casing, wherein the top cover is the secondary battery top cover (100) according to any one of claims 1 to 7 or the secondary battery top cover (100) assembled by the method for assembling a secondary battery top cover according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011290950.4A CN112290133A (en) | 2020-11-18 | 2020-11-18 | Secondary battery top cover and assembling method thereof, and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011290950.4A CN112290133A (en) | 2020-11-18 | 2020-11-18 | Secondary battery top cover and assembling method thereof, and secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112290133A true CN112290133A (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011290950.4A Pending CN112290133A (en) | 2020-11-18 | 2020-11-18 | Secondary battery top cover and assembling method thereof, and secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112290133A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346168A (en) * | 2021-05-21 | 2021-09-03 | 湖北亿纬动力有限公司 | Cylindrical battery with novel structure |
| WO2022198676A1 (en) * | 2021-03-26 | 2022-09-29 | 宁德新能源科技有限公司 | Pole, battery and electronic device |
| CN116053718A (en) * | 2023-03-31 | 2023-05-02 | 广汽埃安新能源汽车股份有限公司 | Battery monomer structure, power battery package and consumer |
| CN116581494A (en) * | 2023-07-12 | 2023-08-11 | 深圳海辰储能控制技术有限公司 | End cover assembly, energy storage device and electric equipment |
| WO2023159507A1 (en) * | 2022-02-25 | 2023-08-31 | 宁德时代新能源科技股份有限公司 | Insulation member, endcap assembly, battery cell, battery, and electrical device |
| WO2023173652A1 (en) * | 2022-03-15 | 2023-09-21 | 微宏动力系统（湖州）有限公司 | Battery assembly, preparation method, battery, and electric vehicle |
-
2020
- 2020-11-18 CN CN202011290950.4A patent/CN112290133A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022198676A1 (en) * | 2021-03-26 | 2022-09-29 | 宁德新能源科技有限公司 | Pole, battery and electronic device |
| CN113346168A (en) * | 2021-05-21 | 2021-09-03 | 湖北亿纬动力有限公司 | Cylindrical battery with novel structure |
| WO2023159507A1 (en) * | 2022-02-25 | 2023-08-31 | 宁德时代新能源科技股份有限公司 | Insulation member, endcap assembly, battery cell, battery, and electrical device |
| WO2023173652A1 (en) * | 2022-03-15 | 2023-09-21 | 微宏动力系统（湖州）有限公司 | Battery assembly, preparation method, battery, and electric vehicle |
| CN116053718A (en) * | 2023-03-31 | 2023-05-02 | 广汽埃安新能源汽车股份有限公司 | Battery monomer structure, power battery package and consumer |
| CN116053718B (en) * | 2023-03-31 | 2023-06-23 | 广汽埃安新能源汽车股份有限公司 | Battery monomer structure, power battery package and consumer |
| CN116581494A (en) * | 2023-07-12 | 2023-08-11 | 深圳海辰储能控制技术有限公司 | End cover assembly, energy storage device and electric equipment |
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