CN219959212U

CN219959212U - Lithium battery top cover assembly convenient to seal assembly

Info

Publication number: CN219959212U
Application number: CN202321517780.8U
Authority: CN
Inventors: 汤益垒; 陈少翔; 梁钜江
Original assignee: Anhui Fangzheng New Energy Technology Co ltd
Current assignee: Anhui Fangzheng New Energy Technology Co ltd
Priority date: 2023-06-14
Filing date: 2023-06-14
Publication date: 2023-11-03
Anticipated expiration: 2033-06-14

Abstract

The utility model discloses a lithium battery top cover assembly convenient for sealing assembly, which relates to the technical field of lithium battery accessories, and comprises a top cover plate, a lower plastic assembly, two polar posts and two locking rings, wherein: the lower plastic component is welded on the top cover sheet, both ends of the top cover sheet are provided with pole holes, the lower plastic component is provided with two through holes, the two through holes are respectively arranged in one-to-one correspondence with the two pole holes, and the through holes are communicated with the pole holes; the two pole posts are respectively in one-to-one correspondence with the two through holes and the two pole post holes, the two pole post holes respectively penetrate through the corresponding through holes and the corresponding pole post holes, and the two pole posts are respectively sleeved with sealing rings. Compared with the prior art, the sealing ring has the advantages that the surface roughness Ra of the sealing ring is between 2.0 and 4.0, the adhesion force of the contact surface of the sealing ring and the top cover plate is large in the pressing process of the sealing ring and the top cover plate, the sealing effect is good, and the use reliability is further improved.

Description

Lithium battery top cover assembly convenient to seal assembly

Technical Field

The utility model relates to the technical field of lithium battery accessories, in particular to a lithium battery top cover assembly convenient to seal and assemble.

Background

A lithium battery is a battery using a nonaqueous electrolyte solution, which uses lithium metal or a lithium alloy as a negative electrode material. The chemical characteristics of lithium metal are very active, so that the processing, storage and use of lithium metal have very high requirements on environment, and along with the development of science and technology, the lithium battery has become the mainstream at present. In the prior art, the battery top cover is covered at the upper end opening of the shell and generally comprises a top cover and two polar posts, the two polar posts are respectively penetrated in the top cover, the inner ends of the polar posts extend to the inside of the shell and are connected with the battery cells in the shell, the outer ends of the polar posts extend to the outside of the top cover and are used for being connected with external elements, and the inner ends of the polar posts are connected with the battery cells through connecting sheets.

The sealing performance of the top cover is achieved by pressing the sealing rings between the positive and negative poles and the top cover sheet structurally in the prior lithium battery, and the surface is smooth (about roughness Ra0.3) due to the fact that the conventional sealing rings are formed by normal injection molding, and after the sealing rings are pressed against the top cover sheet, the adhesion force of the contact surfaces of the sealing rings and the top cover sheet is small, the sealing performance is poor, and the reliability is poor.

Therefore, we propose a lithium battery top cover assembly convenient for sealing assembly, which is used for improving the sealing performance between the top cover and the sealing ring.

Disclosure of Invention

(one) solving the technical problems

The sealing performance of the top cover is generally achieved by pressing the sealing rings between the positive and negative poles and the top cover sheet, and the surface is smooth (roughness Ra0.3 or so) due to the fact that the conventional sealing rings are formed by normal injection molding, and after the sealing rings are pressed against the top cover sheet, the adhesion force of the contact surfaces of the sealing rings and the top cover sheet is small, the sealing performance is poor, and the reliability is poor.

(II) technical scheme

In order to solve the problems, the utility model provides the following technical scheme:

the utility model provides a lithium cell top cap subassembly convenient to seal assembly, includes top cap piece, lower plastic subassembly, two posts and two catch, wherein: the lower plastic component is welded on the top cover sheet, both ends of the top cover sheet are provided with pole holes, the lower plastic component is provided with two through holes, the two through holes are respectively arranged in one-to-one correspondence with the two pole holes, and the through holes are communicated with the pole holes;

the two pole posts are respectively arranged in one-to-one correspondence with the two through holes and the two pole post holes, the two pole post holes respectively penetrate through the corresponding through holes and the corresponding pole post holes, the two pole posts are respectively sleeved with sealing rings, the roughness of the two sealing rings is between 2.0 and 4.0, and the two locking rings are respectively arranged to lock the two pole posts on the two pole post holes.

As a further scheme of the utility model: the lower plastic component comprises an anode lower plastic and a cathode lower plastic, and the two through holes are respectively formed in the anode lower plastic and the cathode lower plastic.

As a further scheme of the utility model: the two polar posts are respectively arranged as copper-aluminum composite polar posts and aluminum polar posts.

As a further scheme of the utility model: the two lock rings are made of positive electrode conductive PPS and negative electrode insulating PPS respectively, and the two lock rings can achieve corresponding using effects.

As a further scheme of the utility model: the plastic under the positive electrode and the plastic under the negative electrode are close to each other, one ends of the plastic are all dodged and provided with grooves, and the two grooves jointly form a central hole.

As a further scheme of the utility model: the middle part position of top cap piece has seted up the relief vent, be provided with explosion-proof valve in the relief vent, utilize explosion-proof valve can guarantee the safety in utilization of top cap piece and lower plastic subassembly.

As a further scheme of the utility model: the surface of the safety hole is provided with a protection sheet for protecting the explosion-proof valve, and the explosion-proof valve can be protected to a certain extent by the protection sheet.

(III) beneficial effects

Compared with the prior art, the utility model has the following beneficial effects:

1. compared with the prior art, the surface roughness Ra of the sealing ring is between 2.0 and 4.0, and compared with the prior art, the sealing ring has the advantages that the adhesion force of the contact surface of the sealing ring and the top cover plate is large in the pressing process, the sealing effect is good, and the use reliability is further improved;

2. according to the utility model, the two polar posts are respectively arranged as the copper-aluminum composite polar post and the aluminum polar post, so that the two polar posts have good use effect; simultaneously, under the locking effect of guaranteeing two lock rings, set up the material of two lock rings as anodal electrically conductive PPS, the insulating PPS of negative pole respectively, can make two lock rings can reach corresponding result of use, convenient to use.

Drawings

The utility model is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an explosive structure of the present utility model;

FIG. 2 is a schematic top view of the present utility model;

FIG. 3 is a schematic cross-sectional view taken along line A-A in FIG. 2;

FIG. 4 is a schematic view of the partial cross-sectional structure of FIG. 3;

fig. 5 is a schematic diagram of a partial cross-sectional structure of fig. 3.

In the figure: 1. a top cover sheet; 2. a pole; 3. a locking ring; 4. a post hole; 5. a through hole; 6. a seal ring; 7. plastic under the positive electrode; 8. plastic under the negative electrode; 9. a central bore; 10. a safety hole; 11. an explosion-proof valve; 12. and a protective sheet.

Detailed Description

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

As shown in fig. 1 to 5, a top cap assembly of a lithium battery, which is convenient for sealing assembly, comprises a top cover sheet 1, a lower plastic assembly, two poles 2 and two locking rings 3, wherein: the lower plastic component is welded on the top cover sheet 1, and specifically, the lower plastic component is welded on the top cover sheet 1 by ultrasonic; the two ends of the top cover plate 1 are provided with pole holes 4, the lower plastic component is provided with two through holes 5, the two through holes 5 are respectively arranged in one-to-one correspondence with the two pole holes 4, and the through holes 5 are communicated with the pole holes 4; the two pole posts 2 are respectively arranged in one-to-one correspondence with the two through holes 5 and the two pole post holes 4, the two pole post holes 4 respectively penetrate through the corresponding through holes 5 and the corresponding pole post holes 4, the two pole posts 2 are respectively sleeved with sealing rings 6, the roughness of the two sealing rings 6 is between 2.0 and 4.0, and the two locking rings 3 are respectively arranged to lock the two pole posts 2 on the two pole post holes 4.

In the prior art, the sealing ring 6 is formed by normal injection molding, and further the surface of the sealing ring is smoother than the surface with the roughness Ra0.3, but the surface roughness of the sealing ring 6 in the embodiment is between 2.0 and 4.0, compared with the prior art, the sealing ring 6 in the embodiment has larger adhesion force on the contact surface between the sealing ring 6 and the top cover plate 1 in the pressing process, has good sealing effect, and further improves the reliability of use.

As shown in fig. 1, for the arrangement of the above-mentioned middle-lower plastic component, the lower plastic component includes a lower positive plastic 7 and a lower negative plastic 8, and two through holes 5 are respectively formed in the lower positive plastic 7 and the lower negative plastic 8.

As shown in fig. 1, in order to make the use effect of the two poles 2 better, the two poles 2 may be respectively set as a copper-aluminum composite pole and an aluminum pole; meanwhile, under the locking effect of the two locking rings 3, in order to enable the two locking rings 3 to achieve corresponding use effects, the materials of the two locking rings 3 can be respectively set to be positive electrode conductive PPS and negative electrode insulating PPS.

As shown in fig. 1 and 3, in order to improve the safety of the overall use of the top cover sheet 1 and the lower plastic component, the ends of the positive lower plastic 7 and the negative lower plastic 8, which are close to each other, may be avoided from being provided with grooves, and the two grooves together form a central hole 9; meanwhile, a safety hole 10 is formed in the middle of the top cover sheet 1, an explosion-proof valve 11 is arranged in the safety hole 10, and the use safety of the top cover sheet 1 and the lower plastic component can be ensured by the explosion-proof valve 11. Further, a protection sheet 12 for protecting the explosion-proof valve 11 may be provided on the surface of the safety vent 10, and the explosion-proof valve 11 may be protected to some extent by the protection sheet 12.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and for simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The foregoing describes one embodiment of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.

Claims

1. Lithium cell top cap subassembly convenient to seal assembly, its characterized in that includes top cap piece (1), lower plastic subassembly, two utmost point posts (2) and two catch (3), wherein: the lower plastic component is welded on the top cover sheet (1), two ends of the top cover sheet (1) are provided with pole holes (4), the lower plastic component is provided with two through holes (5), the two through holes (5) are respectively arranged in one-to-one correspondence with the two pole holes (4), and the through holes (5) are communicated with the pole holes (4);

two utmost point post (2) respectively with two through-holes (5), two utmost point post hole (4) one-to-one setting, two utmost point post holes (4) run through respectively on corresponding through-hole (5), utmost point post hole (4), two all overlap on utmost point post (2) is equipped with sealing washer (6) to the roughness of two sealing washer (6) is between 2.0-4.0, and two catch (3) are installed respectively and are locked two utmost point posts (2) on two utmost point post holes (4).

2. The lithium battery top cover assembly convenient to seal and assemble according to claim 1, wherein the lower plastic assembly comprises a positive lower plastic (7) and a negative lower plastic (8), and the two through holes (5) are respectively formed in the positive lower plastic (7) and the negative lower plastic (8).

3. A lithium battery top cap assembly convenient for sealing assembly according to claim 2, wherein the two poles (2) are respectively provided as copper-aluminum composite poles and aluminum poles.

4. A lithium battery top cap assembly convenient for sealing assembly according to claim 3, wherein the two lock rings (3) are respectively made of positive electrode conductive PPS and negative electrode insulating PPS.

5. The lithium battery top cover assembly convenient to seal and assemble according to claim 4, wherein grooves are formed in the end, close to each other, of the plastic (7) under the positive electrode and the plastic (8) under the negative electrode, and the two grooves form a central hole (9) together.

6. The lithium battery top cover assembly convenient to seal and assemble according to claim 5, wherein a safety hole (10) is formed in the middle of the top cover sheet (1), and an explosion-proof valve (11) is arranged in the safety hole (10).

7. The lithium battery top cap assembly convenient for sealing assembly according to claim 6, wherein the surface of the safety vent (10) is provided with a protection sheet (12) for protecting the explosion-proof valve (11).