CN219534694U

CN219534694U - Cover plate and lithium battery

Info

Publication number: CN219534694U
Application number: CN202223471074.2U
Authority: CN
Inventors: 夏天军; 刘静; 闫怀雷; 沈良军; 辛雪倩
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-08-15
Anticipated expiration: 2032-12-23

Abstract

The utility model discloses a cover plate and a lithium battery, wherein the cover plate comprises an upper plastic body, a sealing part is arranged on the upper plastic body, and the upper plastic body is in sealing connection with a light aluminum sheet through the sealing part; and the sealing ring is abutted against the inner wall of the lower plastic pole hole. According to the utility model, the sealing part and the sealing ring are arranged, and after the cover plate is assembled, the sealing part can seal the gap between the upper plastic and the aluminum gloss sheet, so that in the process of producing the electrolyte injection, even if the upper plastic is polluted by the electrolyte, the electrolyte cannot enter and pollute the aluminum gloss sheet through the gap between the upper plastic and the aluminum gloss sheet, and a series of subsequent problems such as the pollution of the electrolyte to the lower plastic through the post holes of the aluminum gloss sheet and the influence on the edge voltage of the lithium battery can be avoided.

Description

Cover plate and lithium battery

Technical Field

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

Background

With the increasing maturity of lithium battery technology, lithium batteries are widely applied to the fields of electric automobiles and energy storage as power batteries, and the requirements on the usability and the safety of the lithium batteries are increasing. The cover plate is used as a fitting in the lithium battery, and firstly, the cover plate is welded with the aluminum shell to isolate the internal environment from the external environment to play a sealing role; and secondly, the internal and external circuits are connected, and the internal current of the battery is conveyed to the outside through the cover plate pole, so that the flow guiding effect is achieved.

The lithium battery cover plate is generally mainly composed of a light aluminum sheet, a pole post arranged on the light aluminum sheet and the like, and in the prior art, when the cover plate is assembled, a riveting block, the pole post, a sealing ring, upper plastic, lower plastic and the light aluminum sheet are riveted by using a riveting structure, and after the pole post is welded with the riveting block, the assembly is finally completed.

However, in the process of producing the electrolyte injection, the electrolyte is very easy to pollute the upper plastic, the electrolyte may pollute the aluminum sheet along the gap between the upper plastic and the aluminum sheet, and the electrolyte may also form an electronic passage in the cover plate due to the weak conductivity of the electrolyte through the lower plastic post Kong Wuran aluminum sheet, thereby affecting the edge voltage of the lithium battery.

Disclosure of Invention

Based on this, it is necessary to provide a cover plate and a lithium battery in view of the above technical problems.

In one aspect of the present utility model, a cover plate is presented, comprising:

the upper plastic body is provided with a sealing part;

the aluminum sheet is provided with a groove which is matched with the plastic body;

the sealing ring is abutted with the inner wall of the lower plastic pole hole;

the sealing part at least comprises a third sealing piece, and the third sealing piece is connected with the edge of the lower end face of the upper plastic body and is abutted against the bottom of the aluminum sheet groove;

the upper plastic body is in sealing connection with the aluminum sheet through the sealing part.

In some embodiments, the upper plastic body is embedded in the aluminum sheet groove, and the peripheral edge of the upper plastic body is abutted with the wall of the groove.

In some embodiments, the seal further comprises:

the first sealing piece is connected to the peripheral side face of the upper plastic body and is abutted to the upper end face of the aluminum sheet.

In some embodiments, the first seal is provided with a chamfer.

In some embodiments, the seal further comprises:

the second sealing piece is connected to the peripheral side face of the upper plastic body, and one side, deviating from the upper plastic body, of the second sealing piece is abutted to the groove wall of the aluminum sheet groove.

In some embodiments, an end of the first seal proximate to the second seal is integrally connected to the second seal.

In some embodiments, an end of the second seal proximate the third seal is integrally connected to the third seal.

In some embodiments, the lower side of the upper plastic body is concavely arranged towards the direction away from the aluminum sheet, and a plurality of concave parts are formed.

In some embodiments, the seal ring comprises:

a seal ring body;

the first sealing part is connected with the sealing ring body and is abutted against the inner wall of the plastic pole hole;

the second sealing part is connected with the sealing ring body and is abutted against the inner wall of the pole hole of the aluminum sheet;

the third sealing part is connected with the sealing ring body and is abutted against the inner wall of the post hole of the lower plastic.

In a second aspect of the present utility model, there is also provided a lithium battery including:

the cover plate described above;

a battery body.

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

through setting up sealing part and sealing washer, after the apron equipment is accomplished, sealing part can seal the gap between plastic and the light aluminum sheet to make the production annotate the liquid in-process, even have the electrolyte to pollute the plastic, the electrolyte also can't get into and pollute the light aluminum sheet through going up the gap between plastic and the light aluminum sheet, also can avoid the electrolyte to pass through the light aluminum sheet of lower plastic utmost point post Kong Wuran, thereby avoid influencing a series of follow-up problems such as limit voltage of lithium cell.

Drawings

FIG. 1 is a schematic cross-sectional view of a prior art display cover plate;

FIG. 2 is a schematic view of a portion of a plastic in cross section showing the plastic in an exemplary embodiment of the utility model;

fig. 3 is a schematic front view of a seal ring according to an exemplary embodiment of the utility model.

In the figure: 1. applying plastic; 11. a plastic body is arranged; 111. a first seal; 112. a second seal; 113. a third seal; 114. a recessed portion; 2. a seal ring; 21. a seal ring body; 22. a first sealing part; 23. a second sealing part; 24. a third sealing part; 3. a pole; 4. riveting blocks; 5. a polished aluminum sheet; 6. and (5) lower plastic.

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.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships 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 devices or elements referred to must have a specific direction, be configured and operated in the specific direction, 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 relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; 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.

As described in the background art, referring to fig. 1, when the cover plate is assembled, the riveting block 4, the pole 3, the seal ring 2, the upper plastic 1, the lower plastic 6, and the aluminum sheet 5 are riveted by using the riveting structure, and the pole 3 and the riveting block 4 are welded and finally assembled. However, in the process of producing the electrolyte injection, the electrolyte is very easy to pollute the upper plastic 1, the electrolyte may pollute the aluminum sheet 5 along the gap between the upper plastic 1 and the aluminum sheet 5, and the electrolyte may also pollute the aluminum sheet 5 through the lower plastic 6 post Kong Wuran, and the electrolyte forms an electronic passage in the cover plate due to the weak conductivity of the electrolyte, so that the edge voltage of the lithium battery is affected.

In order to solve the above problems, in one aspect of the present utility model, a cover plate is provided, which includes an upper plastic 1, a sealing ring 2, a pole 3, a rivet block 4, a photo-aluminum sheet 5 and a lower plastic 6.

The upper plastic 1 comprises an upper plastic body 11 and a sealing part, and the sealing part is arranged to seal a gap between the upper plastic 1 and the aluminum flake 5, so that even if electrolyte pollutes the upper plastic 1 in the process of liquid injection, the electrolyte cannot enter and pollute the aluminum flake 5 through the gap between the upper plastic 1 and the aluminum flake 5.

On the other hand, referring to fig. 1 and 3, the sealing ring 2 is integrally inserted into the post holes of the upper plastic 1, the aluminum sheet 5 and the lower plastic 6, and meanwhile, the sealing ring 2 is also sleeved on the post 3. Further, the seal ring 2 includes a seal ring 2 body, a first seal portion 22, a second seal portion 23, and a third seal portion 24, all of which are integrally connected. Unlike the sealing ring 2 in the prior art, the sealing ring 2 in the exemplary embodiment of the present utility model can abut against the inner wall of the post hole of the lower plastic 6 by providing the third sealing portion 24, so as to prevent the electrolyte from diffusing to the lower plastic 6, and in addition, after the cover plate is assembled, the first sealing portion 22 abuts against the inner wall of the post hole of the upper plastic 1, and the second sealing portion 23 abuts against the inner wall of the post hole of the aluminum sheet 5. Can avoid the electrolyte from forming the pollution to the apron in the utmost point post hole department of last plastic 1, light aluminum sheet 5 and lower plastic 6, and then avoid a series of follow-up problems such as lithium cell's limit voltage of electrolyte influence.

Specifically, in the exemplary embodiment, the upper end surface of the aluminum sheet 5 is provided with a groove for accommodating and clamping the upper plastic 1, and referring to fig. 1 and 2, the upper plastic body 11 is integrally embedded in the groove of the aluminum sheet 5.

Specifically, in the exemplary embodiment, referring to fig. 2, the sealing portion includes a first sealing member 111, a second sealing member 112 and a third sealing member 113, wherein the first sealing member 111 is formed into a ring shape, and is disposed around the upper plastic body 11 and fixedly connected to the peripheral side surface of the upper plastic body 11, and after the cover plate is assembled, the first sealing member 111 abuts against the upper end surface of the aluminum sheet 5. Further, the first sealing member 111 is integrally connected to the upper plastic body 11. Further, the first sealing member 111 is provided with a chamfer, so that when the electrolyte falls onto the first sealing member 111, the electrolyte can flow down along the chamfer, and continuous pollution caused by the electrolyte being retained on the first sealing member 111 is prevented. Further, the cross section of the first sealing member 111 is formed into a triangle, that is, one side surface of the first sealing member 111 is connected with the upper plastic body 11, the other side surface is abutted against the upper end surface of the aluminum sheet 5, and the third side surface is formed into an inclined surface, so that the electrolyte can smoothly flow down.

In other embodiments, the first sealing member 111 and the upper plastic body 11 may be bonded, and the cross-section of the first sealing member 111 may be rectangular, so as to meet the requirement of abutting the upper end surface of the aluminum sheet 5 and close the gap between the upper plastic body 11 and the aluminum sheet 5.

Specifically, in the exemplary embodiment, the second sealing member 112 is formed in a ring shape and is disposed around the peripheral side surface of the upper plastic body 11, and at the same time, the second sealing member 112 is located directly under the first sealing member 111, one side of the first sealing member 111 close to the second sealing member 112 is integrally connected with the second sealing member 112, and the cross-sectional shape of the second sealing member 112 is formed in a rectangular shape, which is integrally attached to the peripheral side surface of the upper plastic body 11 and integrally connected with the upper plastic body 11. Further, the side of the first sealing member 111 facing away from the upper plastic body 11 is used for abutting against the groove wall of the groove of the aluminum sheet 5, so that the gap between the upper plastic 1 and the aluminum sheet 5 is further sealed, and further pollution of electrolyte is avoided.

Specifically, in the exemplary embodiment, the third sealing member 113 is disposed at the lower side edge of the upper plastic body 11, and when the cover plate is assembled, the second sealing member 112 abuts against the groove bottom of the groove of the aluminum sheet 5 to further close the gap between the upper plastic 1 and the aluminum sheet 5. Further, the third sealing member 113 is formed in a ring shape and integrally connected to the lower side edge of the upper plastic body 11. Further, the outer edge end of the third sealing member 113 is integrally connected with the lower edge end of the second sealing member 112, so that sealing between the four edges of the lower side of the upper plastic body 11 and the aluminum sheet 5 is realized, and sealing effect is improved.

Specifically, in the exemplary embodiment, the lower side portion of the upper plastic body 11 is partially concavely disposed toward a direction away from the aluminum sheet 5, and a plurality of concaves 114 are formed. Because the contact area between the upper plastic 1 and the aluminum sheet 5 is large, and the flatness of the lower end surface of the upper plastic 1 is poor, the battery side voltage is unstable, so that the concave part 114 can form a hollow at the contact position between the upper plastic 1 and the aluminum sheet 5, the contact area between the upper plastic 1 and the aluminum sheet 5 is reduced, and the influence on the battery side voltage is avoided.

In some embodiments, the plurality of concave portions 114 are provided, and the plurality of concave portions 114 may be formed in a rectangular array shape, a mesh shape, or a concentric ring shape.

In summary, by arranging the first sealing member 111, the second sealing member 112 and the third sealing member 113, three-step plugging is realized on a possible diffusion path of the electrolyte, and on the other hand, by arranging the sealing ring, the electrolyte can be prevented from polluting the cover plate from the post holes of the upper plastic 1, the aluminum sheet 5 and the lower plastic 6, thereby preventing the electrolyte from forming an electronic path in the cover plate and further affecting the edge voltage of the lithium battery.

In a second aspect of the present utility model, a lithium battery is further provided, which includes the above-mentioned cover plate and the battery body, so as to avoid the problem that the electrolyte affects the battery side voltage.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A cover sheet, comprising:

the upper plastic body is provided with a sealing part;

the aluminum sheet is provided with a groove which is matched with the upper plastic body;

the sealing ring is abutted against the inner wall of the lower plastic pole hole;

2. The cover plate according to claim 1, wherein the upper plastic body is embedded in the aluminum sheet groove, and a peripheral edge of the upper plastic body is abutted against a wall of the groove.

3. The cover plate of claim 1, wherein the sealing portion further comprises:

4. A cover plate according to claim 3, wherein the first seal is provided with a chamfer.

5. A cover plate according to claim 3, wherein the sealing portion further comprises:

6. The cover plate of claim 5, wherein an end of the first seal adjacent the second seal is integrally connected to the second seal.

7. The cover plate of claim 6, wherein an end of the second seal adjacent the third seal is integrally connected to the third seal.

8. The cover plate according to claim 1, wherein the lower side portion of the upper plastic body is concavely arranged in a direction facing away from the aluminum sheet, and a plurality of concave portions are formed.

9. The cover plate of claim 1, wherein the seal ring comprises:

a seal ring body;

the first sealing part is connected with the sealing ring body and abuts against the inner wall of the plastic pole hole;

the second sealing part is connected with the sealing ring body and is abutted against the inner wall of the pole column hole of the aluminum sheet;

and the third sealing part is connected with the sealing ring body and is abutted against the inner wall of the post hole of the lower plastic.

10. A lithium battery, comprising:

the cover plate of any one of claims 1-9;

a battery body.