CN220233316U

CN220233316U - Top cap subassembly and secondary cell

Info

Publication number: CN220233316U
Application number: CN202321932076.9U
Authority: CN
Inventors: 余隆宇
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2023-07-21
Filing date: 2023-07-21
Publication date: 2023-12-22
Anticipated expiration: 2033-07-21

Abstract

The utility model provides a top cover assembly and a secondary battery, which comprise a cover plate, upper plastic, a bulge, a pole and a switching piece, wherein the cover plate is provided with a first through hole; the upper plastic is positioned on one side of the cover plate, the upper plastic surrounds the first through hole, a second through hole is formed in the upper plastic corresponding to the first through hole, and a second trimming is arranged in the second through hole; the bulge is arranged on one surface of the upper plastic, which faces the cover plate, and is spliced with the cover plate; the pole penetrates through the first through hole and the second through hole, and the circumferential direction of the pole corresponds to the second trimming edge and is provided with a first trimming edge. Above-mentioned structure is provided with protruding grafting apron through last plastic, goes up the plastic and is provided with first side cut, and the utmost point post is provided with the second side cut, so in the post grafting to last plastic in, has realized relative positioning between apron, last plastic and the utmost point post, can avoid appearing utmost point post pivoted problem, and it has simple structure, the convenient advantage of location, and can not influence battery module's energy density.

Description

Top cap subassembly and secondary cell

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a top cover assembly and a secondary battery.

Background

The existing new energy electric automobile generally adopts a secondary battery to supply energy, the battery comprises a cover plate, a bare cell, a switching piece, a shell, a pole and other components, wherein the bare cell can be connected with the pole on the cover plate through a pole lug to transmit electric energy, so that safety risks such as short circuit and the like are reduced due to the fact that the pole lug is prevented from rotating to cause failure with the pole lug, the pole lug needs to be positioned, stability of the pole lug is guaranteed, and therefore safety performance of the battery is improved.

The utility model patent with the prior authorized bulletin number of CN216311926U discloses a plastic bump positioning device on a lithium battery cover plate, bumps are arranged on an upper plastic, the position of the upper plastic on the cover plate is fixed, and meanwhile, the structure of the upper plastic is improved, so that the upper plastic is matched with a pole column, and the positioning effect is integrally achieved.

According to the technical scheme, the square protruding parts are arranged on the cover plate and the lower plastic, the protruding parts of the cover plate and the lower plastic are spliced, the size of the cover plate and the size of the lower plastic are increased, the mass is increased, the energy density of the battery can be influenced, and secondly, the riveting piece, the upper plastic and the cover plate are provided with a plurality of protruding points and grooves, so that the production and assembly difficulty is increased, and the structure is complex.

Disclosure of Invention

In view of the above, the present utility model provides a cap assembly and a secondary battery with a simple positioning structure, so as to solve the problems of complex positioning structure and easy influence on battery energy density of the existing lithium battery cap assembly.

The technical scheme of the utility model is realized as follows:

in one aspect, the present utility model provides a cap assembly and a secondary battery, including a cap plate, an upper plastic, and a post, wherein,

the cover plate is provided with a first through hole;

the pole penetrates through the first through hole, and a first trimming edge is formed on the circumferential surface of the pole;

the upper plastic is sleeved on the pole, a second trimming is arranged on the upper plastic corresponding to the first trimming, and the upper plastic and the cover plate are relatively fixed;

the pole is insulated from the cover plate.

On the basis of the technical scheme, the cover plate is preferably provided with a bulge, the bulge is arranged on one surface of the upper plastic towards the cover plate, and the bulge is spliced with the cover plate.

On the basis of the technical scheme, the pole column part comprises a switching piece, wherein the pole column part is propped against one surface of the upper plastic, which is far away from the cover plate, the switching piece is arranged on one side of the cover plate, which is far away from the upper plastic, and the switching piece is fixedly connected with the pole column.

On the basis of the technical scheme, the sealing ring is preferably arranged in the first through hole, abuts against the cover plate, the pole and the switching piece, and isolates the cover plate from the pole and the switching piece.

On the basis of the above technical solution, preferably, the contact surface of the pole and the switching piece corresponds to the inner peripheral surface of the sealing ring, and a gap is formed between the first cutting edge and the sealing ring.

On the basis of the technical scheme, the device preferably further comprises a filling block, wherein the filling block is arranged in the gap and is abutted against the upper plastic, the pole, the switching piece and the sealing ring.

On the basis of the technical scheme, preferably, the filling block and the upper plastic or the adapter piece or the sealing ring are arranged into an integrated structure.

On the basis of the technical scheme, the cover plate is preferably further provided with lower plastic, the lower plastic is arranged on one surface of the cover plate, which is far away from the upper plastic, and the lower plastic is partially clamped between the cover plate and the adapter plate.

On the basis of the technical proposal, preferably, the lower plastic is provided with a rectangular groove corresponding to the first through hole, the adapter piece comprises a connecting part and an adapter part, wherein,

the connecting part is of a rectangular plate-shaped structure, embedded in the rectangular groove and connected with the pole;

the switching part and the connecting part are of an integrated structure, and the switching part extends to one side of the cover plate far away from the upper plastic.

In another aspect, the present utility model provides a secondary battery including the above-described top cap assembly.

It is still further preferred that the composition,

compared with the prior art, the top cover assembly and the secondary battery have the following beneficial effects:

(1) The upper plastic is relatively fixed with the cover plate, so that the relative positioning of the upper plastic and the cover plate can be realized, the upper plastic is provided with a first trimming, and the pole is provided with a second trimming corresponding to the first trimming, so that after the pole is inserted into the upper plastic, the cover plate, the upper plastic and the pole are relatively positioned, the problem of pole rotation can be avoided, and the battery module has the advantages of simple structure and convenience in positioning, and the energy density of the battery module cannot be influenced;

(2) In the top cover assembly, the pole comprises the first part and the second part, and the second part is propped against one surface of the upper plastic, which is far away from the cover plate, so that after the pole is welded with the adapter piece, each assembly can be clamped and positioned, the pole assembly structure is simplified, the design of matching with trimming is realized, the pole material is saved, and the production cost of the battery is optimized; (3) The connecting part of the switching piece is of a rectangular plate-shaped structure and is embedded in the rectangular groove, so that the switching piece is connected with the pole after the lower plastic is connected with the cover plate, and the pole can be further limited to rotate.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a cap assembly of the present utility model;

FIG. 2 is an exploded view of the cap assembly of the present utility model;

FIG. 3 is a top plan view of the cap assembly of the present utility model;

FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3 in accordance with the present utility model;

FIG. 5 is an enlarged view of the structure of the point A in FIG. 4 according to the present utility model;

FIG. 6 is a block diagram of the header assembly of the present utility model without the filler blocks;

FIG. 7 is a cross-sectional view of an explosive structure of the cap assembly of the present utility model;

FIG. 8 is a block diagram of the lower plastic of the cap assembly of the present utility model;

fig. 9 is a perspective view of a pole of the cap assembly of the present utility model;

fig. 10 is a perspective view of the switching piece of the cap assembly of the present utility model;

FIG. 11 is a perspective view of a seal ring of the cap assembly of the present utility model;

in the figure: 1. a cover plate; 101. a through hole; 2. applying plastic; 201. a second through hole; 202. a second trimming step; 3. a protrusion; 4. a pole; 41. a first section; 42. a second section; 401. a first trimming step; 402. a gap; 5. a transfer sheet; 51. a connection part; 52. a switching part; 6. a seal ring; 7. filling blocks; 8. lower plastic; 801. rectangular grooves; 802. an opening.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1 to 11, the top cover assembly of the present utility model includes a cover plate 1, an upper plastic 2, a protrusion 3, a pole 4, a transfer piece 5, a sealing ring 6, a packing 7 and a lower plastic 8.

As shown in fig. 5, 7, 9 and 11, the cover plate 1 is provided with a first through hole 101; the upper plastic 2 is positioned on one side of the cover plate 1, the upper plastic 2 is arranged around the first through hole 101, a second through hole 201 is formed in the upper plastic 2 corresponding to the first through hole 101, the diameter of the second through hole 201 is smaller than that of the first through hole 101, and a second trimming 202 is arranged in the second through hole 201; the bulge 3 is arranged on one surface of the upper plastic 2 facing the cover plate 1, and the bulge 3 is spliced with the cover plate 1;

according to the structure, after the upper plastic 2 is inserted into the cover plate 1 through the protrusions 3, the relative positioning of the upper plastic 2 and the cover plate 1 can be realized, so that the problem that the upper plastic 2 rotates is avoided;

specifically, a plurality of protrusions 3 are provided, and the plurality of protrusions 3 are equidistantly arranged on the periphery of the second through hole in a circular array manner;

with the structure, the number of the protrusions 3 is preferably three or more, so that the stability and anti-rotation performance of the plugging of the upper plastic 2 and the cover plate 1 are fully ensured;

as shown in fig. 5 and 9, the pole 4 penetrates through the first through hole 101 and the second through hole 201, and a first cut edge 401 is disposed on the circumferential surface of the pole 4 corresponding to the second cut edge 202, and the pole 4 is partially abutted against one surface of the upper plastic 2 away from the cover plate 1;

in the above structure, the second cut edge 202 in the second through hole 201 makes the second through hole 201 not be in a circular shape, and the first cut edge 401 on the pole 4 makes the pole 4 not be in a cylindrical shape, so that after the pole 4 is inserted into the upper plastic 2, the relative positioning of the pole 4 and the upper plastic 2 can be realized, thereby preventing the pole 4 from rotating, ensuring the stability of the pole 4 after being connected with the electrode lug of the bare cell, and enabling the battery to have stable service performance;

as shown in fig. 5, the adaptor 5 is disposed on one side of the cover plate 1 away from the upper plastic 2, and the adaptor 5 is fixedly connected with the pole 4; the pole 4 and the switching piece 5 are insulated from the cover plate 1;

according to the structure, as the pole 4 is partially abutted against the side, away from the cover plate 1, of the upper plastic 2, after the pole 4 is connected with the switching piece 5, the cover plate 1 and the upper plastic 2 can be clamped and positioned, so that the stability of installation of each component is ensured, and the structure has the advantages of simple structure and convenience in fixation, and is beneficial to ensuring the energy density of the battery during grouping.

In this cover plate assembly, the pole 4 and the switching piece 5 are in an electrical connection relationship, and under the condition that the cover plate 1 is made of metal, the pole 4 and the switching piece 5 need to be insulated from the cover plate 1 to avoid short circuit.

As shown in fig. 5, the upper plastic 2 plays an insulating role, and further, is insulated by a sealing ring 6, the sealing ring 6 is arranged in the first through hole 101, and the sealing ring 6 abuts against the cover plate 1, the pole 4 and the adapter piece 5, and isolates the cover plate 1 from the pole 4 and the adapter piece 5;

in the above structure, the sealing ring 6 is disposed in the first through hole 101, one of which can isolate and insulate the pole 4 and the adapter piece 5 from the cover plate 1, and the other of which can seal, so as to prevent water vapor from entering the battery, and ensure the safety performance of the battery.

As shown in fig. 5 and 6, the pole 4 includes a first portion 41 and a second portion 42, wherein the first portion 41 is connected with the switching piece 5, and the first portion 41 abuts against the plastic 2 and the sealing ring 6; the first cutout 401 is provided on the first portion 41; the second portion 42 is connected with the first portion 41, and the second portion 42 abuts against one surface of the upper plastic 2 away from the cover plate 1;

after the pole 4 is mounted, the pole 4 is clamped and fixed to the cover plate 1 and the sealing ring 6 by the second portion 42 and the switching piece 5, and the fixing structure is quite simple, and the pole 4 and the switching piece 5 are welded and fixed during fixing.

Further, the contact surfaces of the pole 4 and the switching piece 5 correspond to the inner peripheral surface of the sealing ring 6;

the arrangement of the structure is to prevent the contact surface of the pole 4 and the adapter piece 5 from being aligned with the contact surface of the sealing ring 6 and the cover plate 1, so as to realize the staggered joint lap joint among the cover plate 1, the upper plastic 2, the pole 4 and the adapter piece 5, which is beneficial to improving the strength of the connecting structure among all components and ensuring the stability during application.

As shown in fig. 6, in the structure of the staggered joint and butt joint of each component, a gap 402 is formed between the first cutting edge 401 and the sealing ring 6, and a filling block 7 is arranged to avoid shaking caused by the existence of the gap 402;

specifically, as shown in fig. 5, the filling block 7 is disposed in the gap 402, and the filling block 7 abuts against the plastic 2, the pole 4, the adapter piece 5 and the sealing ring 6;

by arranging the filling block 7 in the gap 402, the stability of connection among the pole 4, the adapter piece 5 and the sealing ring 6 can be further ensured, and the problems of shaking and storing impurities are avoided.

Further, the filling block 7 and the upper plastic 2 or the sealing ring 6 are arranged into an integrated structure;

as described above, since the volume of the packing 7 is small, the assembly of the top cover assembly is not convenient enough due to the separate arrangement, and therefore, the packing 7 can be integrally formed with any one of the upper plastic 2, the upper plastic 2 and the sealing ring 6 by means of stamping, injection molding, etc., so that the packing 7 does not need to be assembled separately, and the convenience of the assembly of the top cover assembly can be improved.

As shown in fig. 1 and 2, the lower plastic 8 is disposed on a surface of the cover plate 1 away from the upper plastic 2, and the lower plastic 8 is partially clamped between the cover plate 1 and the adapter plate 5;

the lower plastic 8 is used for insulating the cover plate 1 and the adapter plate 5, and the lower plastic 8 is also used for connecting the cover plate 1 with the battery shell, so as to ensure the sealing performance after assembly.

As shown in fig. 8 and 10, the lower plastic 8 is provided with a rectangular groove 801 corresponding to the first through hole 101, the switching piece 5 includes a connecting portion 51 and a switching portion 52, wherein the connecting portion 51 has a rectangular plate structure, the connecting portion 51 is embedded in the rectangular groove 801, and the connecting portion 51 is connected with the pole 4; the switching part 52 and the connecting part 51 are of an integrated structure, and the switching part 52 extends to one side of the cover plate 1 far away from the upper plastic 2;

in the above structure, when the adapter piece 5 is installed, the connecting part 51 of the adapter piece 5 is embedded in the rectangular groove 801, and the connecting part 51 is fixedly connected with the pole 4, which can further prevent the pole 4 from rotating by matching the rectangular groove 801 with the connecting part 51, so as to ensure the stability of the pole 4;

since the connection portion 51 is to be connected to the pole 4, the lower plastic 8 is provided with an opening 802 corresponding to the first through hole 101, so that the connection portion 51 can be led out of the connection pole 4.

The secondary battery comprises the top cover assembly, wherein the top cover assembly is used for sealing a battery shell and is electrically connected with a bare cell in the battery shell;

when the battery is specifically assembled, the battery shell is internally provided with the bare cell, the bare cell is connected with the switching piece 5 through the lug, and then the battery shell is sealed through the top cover component.

The specific implementation steps are as follows:

during assembly, the upper plastic 2 is inserted on the cover plate 1 through the protrusions 3, the sealing ring 6 is arranged in the through hole 101, then the lower plastic part 8 is arranged on the cover plate 1, the pole 4 is inserted into the through hole 101 from one side of the cover plate 1, the first trimming edge 401 of the pole 4 is attached to the second trimming edge 202 of the upper plastic 2, then the rotating sheet 5 is arranged from the other side of the cover plate 1, and finally the pole 4 and the rotating sheet 5 are welded and fixed, so that the cover plate 1, the upper plastic 2, the pole 4, the rotating sheet 5 and the sealing ring 6 are relatively positioned.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A top cap subassembly, characterized in that: comprises a cover plate (1), an upper plastic (2) and a pole (4), wherein,

the cover plate (1) is provided with a first through hole (101);

the pole (4) penetrates through the first through hole (101), and a first cutting edge (401) is formed on the circumferential surface of the pole (4);

the upper plastic (2) is sleeved on the pole (4), the upper plastic (2) is provided with a second trimming (202) corresponding to the first trimming (401), and the upper plastic (2) and the cover plate (1) are relatively fixed;

the pole (4) is insulated from the cover plate (1).

2. The header assembly of claim 1, wherein: the novel plastic cover is characterized by further comprising a protrusion (3), wherein the protrusion (3) is arranged on one surface of the upper plastic (2) facing the cover plate (1), and the protrusion (3) is spliced with the cover plate (1).

3. The header assembly of claim 1, wherein: still include changeover piece (5), utmost point post (4) part support hold go up plastic (2) are kept away from the one side of apron (1), changeover piece (5) set up apron (1) are kept away from go up one side of plastic (2), just changeover piece (5) with utmost point post (4) fixed connection.

4. The header assembly of claim 3, wherein: still include sealing washer (6), sealing washer (6) set up in first through-hole (101), just sealing washer (6) support hold apron (1) utmost point post (4) with changeover piece (5), and will apron (1) with utmost point post (4) and changeover piece (5) keep apart.

5. The header assembly of claim 4, wherein: the contact surface of the pole (4) and the adapter piece (5) corresponds to the inner peripheral surface of the sealing ring (6), and a gap (402) is formed between the first trimming edge (401) and the sealing ring (6).

6. The header assembly of claim 5, wherein: the novel high-voltage power supply further comprises a filling block (7), wherein the filling block (7) is arranged in the gap (402), and the filling block (7) abuts against the upper plastic (2), the pole (4), the switching piece (5) and the sealing ring (6).

7. The header assembly of claim 6, wherein: the filling block (7) and the upper plastic (2) or the adapter piece (5) or the sealing ring (6) are arranged into an integrated structure.

8. The header assembly of claim 3, wherein: the plastic cover is characterized by further comprising a lower plastic (8), wherein the lower plastic (8) is arranged on one surface of the cover plate (1) far away from the upper plastic (2), and the lower plastic (8) is locally clamped between the cover plate (1) and the adapter piece (5).

9. The header assembly of claim 8, wherein: the lower plastic (8) is provided with a rectangular groove (801) corresponding to the first through hole (101), the adapter piece (5) comprises a connecting part (51) and an adapter part (52), wherein,

the connecting part (51) is of a rectangular plate-shaped structure, the connecting part (51) is embedded in the rectangular groove (801), and the connecting part (51) is connected with the pole (4);

the switching part (52) and the connecting part (51) are of an integrated structure, and the switching part (52) extends to one side of the cover plate (1) away from the upper plastic (2).

10. A secondary battery characterized in that: comprising a cap assembly according to any one of claims 1 to 9.