CN221262660U

CN221262660U - Cylindrical battery convenient to PACK

Info

Publication number: CN221262660U
Application number: CN202322677406.0U
Authority: CN
Inventors: 张峰
Original assignee: Shenzhen Qidian Energy Technology Co ltd
Current assignee: Shenzhen Qidian Energy Technology Co ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-07-02
Anticipated expiration: 2033-09-28

Abstract

The utility model provides a cylindrical battery convenient to PACK, includes the shell, install in electric core and sealing connection in the shell both ends positive electrode cover plate assembly and negative electrode cover plate assembly, positive electrode cover plate assembly includes positive pole top cap and positive pole post, the one end of positive pole post with the one end of electric core is connected, the other end of positive pole post passes positive pole top cap is used for being connected with the external conductor, negative electrode cover plate assembly includes negative electrode top cap and negative electrode post, the one end of negative electrode post with the other end of electric core is connected, the other end of negative electrode post passes the negative electrode top cap is used for being connected with the external conductor, be located outside terminal surface to positive electrode top cap's distance on the positive electrode post with be located outside terminal surface to the difference between the distance of negative electrode top cap be 0mm ~ 0.3mm. Compared with the prior art, the cylindrical battery is convenient to pack, the structural requirement on the connecting sheet is reduced, and the connecting efficiency of the connecting sheet is improved.

Description

Cylindrical battery convenient to PACK

Technical Field

The utility model belongs to the technical field of cylindrical batteries, and particularly relates to a cylindrical battery convenient for PACK.

Background

In the PACK process of the cylindrical batteries, connecting pieces are adopted to connect two adjacent batteries or a plurality of batteries, so that an integral battery PACK is formed between the cylindrical batteries.

Because the protruding heights of the positive electrode post and the negative electrode post of the partial cylindrical batteries are different, when two adjacent cylindrical batteries are connected, a Z-shaped connecting sheet is needed to be adopted for connection so as to adapt to the positive electrode post and the negative electrode post with different heights. As disclosed in publication No. CN114361436a, a square cylindrical lithium cobalt oxide battery and a method for manufacturing the same are provided, the square cylindrical lithium cobalt oxide battery includes a battery case, one end of the case is provided with a positive electrode assembly, and the other end is provided with a negative electrode assembly; the negative electrode assembly comprises a sealing screw, a negative electrode cover plate, a negative electrode support, a negative electrode post and a negative electrode plate, wherein the negative electrode post penetrates through the negative electrode support and the negative electrode cover plate to be exposed to the outside and is fixed through welding. Referring to fig. 1, the anode posts protrude from the anode cover plate by a distance, so that connection tabs having different heights (e.g., zigzag connection tabs) are required to connect adjacent cylindrical batteries.

However, the connecting sheets with different heights (such as Z-shaped connecting sheets) are adopted, so that the processing difficulty and the production and manufacturing cost of the connecting sheets are improved.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art and provides a cylindrical battery convenient for PACK.

In order to achieve the above purpose, the utility model discloses a cylindrical battery convenient for PACK, which comprises a shell, a battery core arranged in the shell, and a positive cover plate component and a negative cover plate component which are connected to two ends of the shell in a sealing way, wherein the positive cover plate component comprises a positive top cover and a positive pole post, one end of the positive pole post is connected with one end of the battery core, the other end of the positive pole post penetrates through the positive top cover to be connected with an external conductor, the negative cover plate component comprises a negative top cover and a negative pole post, one end of the negative pole post is connected with the other end of the battery core, the other end of the negative pole post penetrates through the negative top cover to be connected with the external conductor, and the difference value between the distance from the end face of the positive pole post positioned on the outside to the positive top cover and the distance from the end face of the negative pole post positioned on the outside to the negative top cover is 0 mm-0.3 mm.

Preferably, the difference between the distance from the external end face of the positive electrode pole to the positive electrode top cover and the distance from the external end face of the negative electrode pole to the negative electrode top cover is 0mm.

Further preferably, the distance between the end face of the negative electrode pole column positioned on the outside and the negative electrode top cover is 0.3 mm-0.3 mm.

Further preferably, the negative electrode post is provided with a liquid injection hole.

Preferably, the cross-section shape of the inner wall of the shell is square; the positive electrode cover plate assembly is provided with a plurality of first support legs extending into the shell, and the inner walls of the first support legs jointly limit a first limiting cavity; the negative electrode cover plate assembly is provided with a plurality of second support legs extending into the shell, and the inner walls of the second support legs jointly limit a second limiting cavity; the two ends of the battery cell are respectively embedded into the first limiting cavity and the second limiting cavity and are in abutting limiting fit with the wall surfaces in the corresponding limiting cavities.

Further preferably, the first support leg and/or the second support leg are/is provided with inner cavities arranged along the length direction, and two ends of the inner cavities respectively penetrate through two end parts of the corresponding support legs.

Further preferably, the end of the first support leg and/or the second support leg, which is close to the outside, is provided with a circulation inclined hole.

Further preferably, the outer wall of the first leg and/or the second leg is press fit with the inner wall of the housing.

Preferably, the battery cell is a full-tab battery cell.

Compared with the prior art, the utility model has the beneficial effects that: according to the cylindrical battery convenient for PACK, the difference between the distance from the end face on the outer part of the positive electrode pole to the positive electrode top cover and the distance from the end face on the outer part of the negative electrode pole to the negative electrode top cover is 0-0.3 mm, so that in the PACK process of the cylindrical battery, the adjacent cylindrical batteries can be connected by adopting the sheet-shaped connecting sheet without adopting the connecting sheet with different heights, the structural requirement on the connecting sheet is reduced, the production and the manufacturing of the connecting sheet are facilitated, and the cost for manufacturing the connecting sheet and the overall cost of the cylindrical battery are reduced. In addition, as the distances between the positive pole post and the negative pole post protruding from the corresponding top plate are almost similar, the connecting sheet is convenient to connect to the adjacent batteries, and the connecting efficiency of the connecting sheet is improved.

Drawings

FIG. 1 is a cross-sectional view showing the structure of a square cylindrical battery in the assembled state of a prior art CN 114361436A;

FIG. 2 is a front view of a cylindrical battery of the present utility model for facilitating PACK;

FIG. 3 is a schematic view showing an exploded perspective structure of a cylindrical battery for PACK according to the present utility model;

FIG. 4 is a schematic exploded perspective view of the negative cap assembly of FIG. 3;

FIG. 5 is a schematic perspective exploded view of the positive cover assembly of FIG. 3;

a housing 1;

a battery cell 2;

A positive electrode cover plate assembly 3; a positive electrode current collecting plate 31; a positive electrode top cover 32; a positive electrode post 33; a positive electrode holder 34; a first leg 341; a first spacing cavity 342; an inner cavity 35; a flow-through inclined hole 36;

a negative electrode cap assembly 4; a negative electrode current collecting plate 41; a negative cap 42; a negative electrode post 43; a negative electrode holder 44; a second leg 441; a second spacing cavity 442.

Detailed Description

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The technical scheme of the utility model is further described below with reference to fig. 2-4.

A cylindrical battery convenient for PACK, see fig. 2-5, comprises a housing 1, a battery core 2 arranged in the housing 1, and a positive electrode cover plate assembly 3 and a negative electrode cover plate assembly 4 which are connected with two ends of the housing 1 in a sealing manner.

In this embodiment, the battery cell 2 is a full tab battery cell 2. The positive electrode cover plate assembly 3 comprises a positive electrode current collecting disc 31, a positive electrode top cover 32 and a positive electrode column 33, wherein the positive electrode current collecting disc 31 is welded at one end of the battery core 2, one end of the positive electrode column 33 is welded on the positive electrode current collecting disc 31, the other end of the positive electrode column 33 penetrates through the positive electrode top cover 32 to be connected with an external conductor, and the positive electrode top cover 32 is welded at one end of the shell 1. The negative electrode cover plate assembly 4 comprises a negative electrode current collecting disc 41, a negative electrode top cover 42 and a negative electrode pole 43, wherein the negative electrode current collecting disc 41 is welded at the other end of the battery cell 2, one end of the negative electrode pole 43 is welded on the negative electrode current collecting disc 41, the other end of the negative electrode pole 43 penetrates through the negative electrode top cover 42 to be connected with an external conductor, and the negative electrode top cover 42 is welded at the other end of the shell 1. The negative electrode post 43 is provided with a liquid injection hole. In the embodiment, the full-tab battery cell 2 is used, and the current collecting disc with larger area is welded on the battery cell 2, so that the current guiding area and the overcurrent capacity of the battery are increased, the internal resistance and the heat productivity of the battery are reduced, and the performance of the battery is improved.

In the PACK process, if the heights of the top covers corresponding to the positive pole and the negative pole are inconsistent, the welding position needs to be adjusted when the connecting sheet is welded, the welding process is complex, and the efficiency is low. In this embodiment, the difference between the distance from the external end face of the positive electrode post 33 to the positive electrode top cover 32 and the distance from the external end face of the negative electrode post 43 to the negative electrode top cover 42 is 0mm to 0.3mm, so that in the PACK process of the cylindrical battery, a sheet-shaped connecting sheet can be used to connect (e.g. weld) adjacent cylindrical batteries without using connecting sheets with different heights, which reduces the structural requirement on the connecting sheet, facilitates the production and manufacture of the connecting sheet, and reduces the cost of manufacturing the connecting sheet and the overall cost of the cylindrical battery. In addition, since the distances of the positive electrode post 33 and the negative electrode post 43 protruding from the corresponding top plate are nearly similar, it is convenient to connect the connection pieces to the adjacent batteries, and the connection efficiency of the connection pieces is improved.

In this embodiment, as a preferred embodiment, the distance from the external end face of the positive electrode post 33 to the positive electrode top cover 32 is equal to the distance from the external end face of the negative electrode post 43 to the negative electrode top cover 42, that is, the protruding heights of the positive electrode post 33 and the negative electrode post 43 are equal, so that the welding position does not need to be adjusted when the connecting piece is welded, the welding effect is optimal, and the reliability and safety of the battery are improved.

In this embodiment, the negative electrode post 43 is welded to the negative top cap 42. To facilitate welding of the negative electrode tab 43, the distance between the end surface of the negative electrode tab 43 located on the outside and the negative electrode top cover 42 is 0.3mm to 0.3mm.

In the present embodiment, referring to fig. 3 to 5, the cross-sectional shape of the inner wall of the housing 1 is square. The positive cover plate assembly 3 further comprises a positive support 34, wherein a plurality of first supporting legs 341 extending into the shell 1 are arranged on the positive support 34, and first limiting cavities 342 are jointly limited by the inner walls of the first supporting legs 341; the negative electrode cover plate assembly 4 further comprises a negative electrode bracket 44, wherein a plurality of second supporting legs 441 extending into the housing 1 are arranged on the negative electrode bracket 44, and second limiting cavities 442 are jointly limited by inner walls of the plurality of second supporting legs 441. During assembly, after the posts are welded on the current collecting plate, the two supports are correspondingly sleeved on the battery core 2, and two ends of the battery core 2 are respectively embedded into the first limiting cavity 342 and the second limiting cavity 442 and are in abutting limiting fit with the wall surfaces in the corresponding limiting cavities, so that the battery core 2 is stably assembled. The first limiting cavity 342 is limited by arranging the plurality of first supporting feet 341 on the positive electrode cover plate assembly 3, the second limiting cavity 442 is limited by arranging the plurality of second supporting feet 441 on the negative electrode cover plate assembly 4, and the first limiting cavity 342 and the second limiting cavity 442 are in limiting fit with two end parts of the battery cell 2, so that the battery cell 2 is firmly installed in the shell 1. On this basis, set up the cross-sectional shape of the inner wall of shell 1 into square, this is compared with current cylindric shell 1, and the space between shell 1 inner wall and the electric core 2 is bigger to can store more electrolyte, finally effectively improve the life of battery.

In this embodiment, referring to fig. 3 to 5, the first and second legs 341 and 441 are each four, which are uniformly distributed at edge positions on the corresponding bracket. During assembly, the four first supporting legs 341 and the four second supporting legs 441 are correspondingly located at four corner positions in the casing 1, and the outer walls of the supporting legs are in press fit with the inner wall of the casing 1, so that the assembly stability of the positive electrode support 34 and the negative electrode support 44 is improved, and the assembly stability and reliability of the battery cell 2 are further improved.

In this embodiment, referring to fig. 3-5, the first supporting leg 341 and the second supporting leg 441 are provided with inner cavities 35 extending along the length direction thereof, and two ends of the inner cavities 35 respectively penetrate through two ends of the corresponding supporting leg, which not only ensures the strength of the supporting leg, but also makes full use of the inner space of the supporting leg, thereby increasing the space for storing electrolyte inside the casing 1 and effectively prolonging the service life of the battery.

In this embodiment, one end of the inner cavity 35 of the first leg 341 and the second leg 441 is close to the corresponding top cover, in order to ensure the fluidity of the electrolyte in the inner cavity 35 and close to the top cover, thereby ensuring the service performance of the battery, referring to fig. 4 to 5, the end of the first leg 341 and the second leg 441 close to the outside is provided with the through inclined holes 36, so that the fluidity of the electrolyte in the inner cavity 35 is improved, and the service performance of the battery is further improved.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A cylindrical battery convenient to PACK, characterized in that: including the shell, install in electric core and sealing connection in the shell both ends positive pole apron subassembly and negative pole apron subassembly, positive pole apron subassembly includes positive pole top cap and positive pole post, the one end of positive pole post with the one end of electric core is connected, the other end of positive pole post passes positive pole top cap is used for being connected with the external conductor, negative pole apron subassembly includes negative pole top cap and negative pole post, the one end of negative pole post with the other end of electric core is connected, the other end of negative pole post passes negative pole top cap is used for being connected with the external conductor, the difference between the terminal surface that is located outside on the positive pole post to positive pole top cap with the terminal surface that is located outside on the negative pole post to the distance of negative pole top cap is 0mm ~ 0.3mm.

2. The PACK convenient cylindrical battery according to claim 1, wherein: the difference between the distance from the end face of the positive electrode pole, which is positioned on the outside, to the positive electrode top cover and the distance from the end face of the negative electrode pole, which is positioned on the outside, to the negative electrode top cover is 0mm.

3. A PACK convenient cylindrical battery according to any one of claims 1-2, wherein: the distance between the end face of the cathode pole column positioned outside and the cathode top cover is 0.3 mm-0.3 mm.

4. A PACK convenient cylindrical battery according to claim 3, wherein: and the negative pole post is provided with a liquid injection hole.

5. The PACK convenient cylindrical battery according to claim 1, wherein: the section shape of the inner wall of the shell is square; the positive electrode cover plate assembly is provided with a plurality of first support legs extending into the shell, and the inner walls of the first support legs jointly limit a first limiting cavity; the negative electrode cover plate assembly is provided with a plurality of second support legs extending into the shell, and the inner walls of the second support legs jointly limit a second limiting cavity; the two ends of the battery cell are respectively embedded into the first limiting cavity and the second limiting cavity and are in abutting limiting fit with the wall surfaces in the corresponding limiting cavities.

6. The PACK convenient cylindrical battery according to claim 5, wherein: the first support leg and/or the second support leg are/is internally provided with an inner cavity which is arranged along the length direction of the first support leg and/or the second support leg, and two ends of the inner cavity respectively penetrate through two end parts of the corresponding support leg.

7. The PACK convenient cylindrical battery according to claim 6, wherein: and the end part, close to the outside, of the first support leg and/or the second support leg is provided with a circulation inclined hole.

8. The PACK convenient cylindrical battery according to claim 5, wherein: the outer wall of the first support leg and/or the second support leg is in press fit with the inner wall of the shell.

9. The PACK convenient cylindrical battery according to claim 1, wherein: the battery cell is a full-tab battery cell.