A cover plate and a lithium battery

Abstract

A cover plate comprising: an upper plastic disposed on one side of a bare aluminum sheet having an upper plastic body; a lower plastic disposed on another side of the bare aluminum sheet; the bare aluminum sheet having a groove configured to fit the upper plastic body; a seal ring body; a first sealing portion connected to the seal ring body and abutting an inner wall of a terminal post hole of the upper plastic; a second sealing portion connected to the seal ring body and abutting an inner wall of a terminal post hole of the bare aluminum sheet; a third sealing portion connected to the seal ring body and abutting the inner wall of a terminal post hole of the lower plastic.

Description

Cover plate and lithium battery Technical Field

[0001] The present application relates to the technical field of lithium batteries, and specifically to a cover plate and a lithium battery. Background Art

[0002] As lithium battery technology matures, it's widely used in electric vehicles and energy storage as a power source, raising the bar for performance and safety. The cover, a component in lithium batteries, primarily seals the battery by welding it to the aluminum shell, isolating it from the outside world. It also connects the internal and external circuits, channeling the battery's internal current through the cover's terminals and acting as a guide.

[0003] The lithium battery cover is generally composed of a plain aluminum sheet and a pole mounted on the plain aluminum sheet. In the prior art, when the cover is assembled, the rivet block, pole, sealing ring, upper plastic, lower plastic, and plain aluminum sheet are riveted together using a riveting structure. After the pole is welded to the rivet block, the final assembly is completed.

[0004] However, during the production and injection process, the electrolyte is very easy to contaminate the upper plastic. The electrolyte may contaminate the bare aluminum sheet along the gap between the upper plastic and the bare aluminum sheet, or it may contaminate the bare aluminum sheet through the lower plastic pole hole. Since the electrolyte has weak conductivity, the electrolyte forms an electron path in the cover plate, thereby affecting the edge voltage of the lithium battery. Utility Model Content

[0005] Based on this, it is necessary to propose a cover plate and a lithium battery to address the above technical problems.

[0006] In one aspect of the present application, a cover plate is provided, comprising:

[0007] an upper plastic body, wherein a sealing portion is provided on the upper plastic body;

[0008] A plain aluminum sheet with a groove adapted to fit the plastic body;

[0009] A sealing ring abuts against the inner wall of the lower plastic pole hole;

[0010] The sealing portion includes at least a third sealing member, which is connected to the edge of the lower end surface of the upper plastic body and abuts against the bottom of the groove of the smooth aluminum sheet;

[0011] The upper plastic body and the plain aluminum sheet are sealed and connected via the sealing portion.

[0012] In some embodiments, the upper plastic body is embedded in the groove of the smooth aluminum sheet, and the peripheral edge of the upper plastic body abuts against the groove wall of the groove.

[0013] In some embodiments, the sealing portion further comprises:

[0014] The first sealing member is connected to the peripheral side surface of the upper plastic body and abuts against the upper end surface of the smooth aluminum sheet.

[0015] In some embodiments, the first sealing member is provided with chamfered corners.

[0016] In some embodiments, the sealing portion further comprises:

[0017] The second sealing member is connected to the peripheral side surface of the upper plastic body, and the side of the second sealing member facing away from the upper plastic body abuts against the groove wall of the smooth aluminum sheet groove.

[0018] In some embodiments, one end of the first seal member adjacent to the second seal member is integrally connected to the second seal member.

[0019] In some embodiments, one end of the second seal member adjacent to the third seal member is integrally connected to the third seal member.

[0020] In some embodiments, the lower side of the upper plastic body is recessed in a direction away from the aluminum sheet, and has a plurality of recessed portions.

[0021] In some embodiments, the sealing ring comprises:

[0022] Sealing ring body;

[0023] The first sealing portion is connected to the sealing ring body and abuts against the inner wall of the plastic pole hole;

[0024] The second sealing portion is connected to the sealing ring body and abuts against the inner wall of the pole hole of the bare aluminum sheet;

[0025] The third sealing portion is connected to the sealing ring body and abuts against the inner wall of the lower plastic pole hole.

[0026] In a second aspect of the present application, a lithium battery is further provided, comprising:

[0027] The cover plate described above;

[0028] Battery body.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] By providing a sealing part and a sealing ring, after the cover plate is assembled, the sealing part can seal the gap between the upper plastic and the plain aluminum sheet, so that during the production injection process, even if the electrolyte contaminates the upper plastic, the electrolyte cannot enter through the gap between the upper plastic and the plain aluminum sheet and contaminate the plain aluminum sheet. It can also prevent the electrolyte from contaminating the plain aluminum sheet through the lower plastic pole hole, thereby avoiding affecting the edge voltage of the lithium battery and a series of subsequent problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic cross-sectional view of a display cover in the prior art;

[0032] FIG2 is a partial cross-sectional view of the upper plastic portion of the display in an exemplary embodiment of the present application;

[0033] FIG3 is a schematic front view of a sealing ring in an exemplary embodiment of the present application.

[0034] In the figure: 1. Upper plastic; 11. Upper plastic body; 111. First sealing member; 112. Second sealing member; 113. Third sealing member; 114. Recessed portion; 2. Sealing ring; 21. Sealing ring body; 22. First sealing portion; 23. Second sealing portion; 24. Third sealing portion; 3. Pole; 4. Riveted block; 5. Plain aluminum sheet; 6. Lower plastic. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "two ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0038] As described in the background section, with reference to Figure 1 , during cover assembly, the rivet block 4, pole 3, sealing ring 2, upper plastic 1, lower plastic 6, and plain aluminum sheet 5 are riveted together using a riveted structure. After the pole 3 is welded to the rivet block 4, assembly is complete. However, during the production and injection process, the electrolyte can easily contaminate the upper plastic 1. This electrolyte can contaminate the plain aluminum sheet 5 through the gap between the upper plastic 1 and the plain aluminum sheet 5, and can also contaminate the plain aluminum sheet 5 through the pole holes in the lower plastic 6. Because the electrolyte has weak conductivity, it forms an electron pathway in the cover, which in turn affects the lithium battery's side voltage.

[0039] To improve the above problem, in one aspect of the present application, a cover is proposed, which includes an upper plastic 1, a sealing ring 2, a pole 3, a riveting block 4, a plain aluminum sheet 5 and a lower plastic 6.

[0040] Among them, the upper plastic 1 includes an upper plastic body 11 and a sealing part. The present application sets a sealing part to seal the gap between the upper plastic 1 and the bare aluminum sheet 5, so that during the production injection process, even if the electrolyte contaminates the upper plastic 1, the electrolyte cannot enter through the gap between the upper plastic 1 and the bare aluminum sheet 5 and contaminate the bare aluminum sheet 5.

[0041] On the other hand, referring to Figures 1 and 3, the sealing ring 2 is entirely inserted into the pole hole of the upper plastic 1, the bare aluminum sheet 5, and the lower plastic 6. At the same time, the sealing ring 2 is also sleeved on the pole 3. Furthermore, the sealing ring 2 includes a sealing ring 2 body, a first sealing portion 22, a second sealing portion 23, and a third sealing 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 application is capable of abutting the inner wall of the pole hole of the lower plastic 6 by providing the third sealing portion 24 to prevent the electrolyte from diffusing into the lower plastic 6. In addition, after the cover plate is assembled, the first sealing portion 22 abuts the inner wall of the pole hole of the upper plastic 1, and the second sealing portion 23 abuts the inner wall of the pole hole of the bare aluminum sheet 5. This can prevent the electrolyte from contaminating the cover plate from the pole hole of the upper plastic 1, the bare aluminum sheet 5, and the lower plastic 6, thereby preventing a series of subsequent problems such as the electrolyte affecting the side voltage of the lithium battery.

[0042] Specifically, in the exemplary embodiment, a groove for accommodating and clamping the upper plastic 1 is formed on the upper end surface of the smooth aluminum sheet 5 . Referring to FIG. 1 and FIG. 2 , the upper plastic body 11 is entirely embedded in the groove of the smooth aluminum sheet 5 .

[0043] Specifically, in an exemplary embodiment, referring to FIG2 , the sealing portion includes a first sealing member 111, a second sealing member 112, and a third sealing member 113. The first sealing member 111 is annular and surrounds the upper plastic body 11, fixedly connected to the peripheral side surface of the upper plastic body 11. After the cover is assembled, the first sealing member 111 abuts the upper end surface of the plain aluminum sheet 5. Furthermore, the first sealing member 111 is integrally connected to the upper plastic body 11. Furthermore, the first sealing member 111 is provided with chamfered corners, so that when the electrolyte falls onto the first sealing member 111, the electrolyte flows down along the chamfered corners, preventing the electrolyte from being retained on the first sealing member 111 and causing persistent contamination. Furthermore, the first sealing member 111 has a triangular cross-section, with one side of the first sealing member 111 connected to the upper plastic body 11, another side abutting the upper end surface of the plain aluminum sheet 5, and the third side being inclined to facilitate electrolyte flow.

[0044] In some other embodiments, the first seal 111 and the upper plastic body 11 can be connected by bonding, and the cross-sectional shape of the first seal 111 can also be a rectangle or other shapes, so as to abut the upper end surface of the smooth aluminum sheet 5 and close the gap between the upper plastic body 11 and the smooth aluminum sheet 5.

[0045] Specifically, in the exemplary embodiment, the second seal 112 is annular and surrounds the circumference of the upper plastic body 11. It is located directly below the first seal 111, and the side of the first seal 111 closest to the second seal 112 is integrally connected to the second seal 112. The second seal 112 has a rectangular cross-section and is entirely attached to and integrally connected to the circumference of the upper plastic body 11. Furthermore, the side of the first seal 111 facing away from the upper plastic body 11 abuts against the wall of the groove in the aluminum sheet 5, thereby further sealing the gap between the upper plastic 1 and the aluminum sheet 5 and preventing further contamination of the electrolyte.

[0046] Specifically, in the exemplary embodiment, a third sealing member 113 is positioned at the lower edge of the upper plastic body 11. When the cover is assembled, the second sealing member 112 abuts the bottom of the groove in the plain aluminum sheet 5, further sealing the gap between the upper plastic body 1 and the plain aluminum sheet 5. Furthermore, the third sealing member 113 is annular and integrally connected to the lower edge of the upper plastic body 11. Furthermore, the outer edge of the third sealing member 113 is integrally connected to the lower edge of the second sealing member 112, thereby achieving a seal between the four lower edges of the upper plastic body 11 and the plain aluminum sheet 5, improving the sealing effect.

[0047] Specifically, in the exemplary embodiment, the lower side of the upper plastic body 11 is partially recessed, facing away from the plain aluminum sheet 5, to form a plurality of recesses 114. Because the contact area between the upper plastic body 1 and the plain aluminum sheet 5 is large, and the poor flatness of the lower end surface of the upper plastic body 1 can lead to unstable battery-side voltage, the recesses 114 are designed to create a hollowing out at the contact point between the upper plastic body 1 and the plain aluminum sheet, thereby reducing the contact area between the upper plastic body 1 and the plain aluminum sheet 5 and preventing the battery-side voltage from being affected.

[0048] In some embodiments, a plurality of recessed portions 114 are provided, and the plurality of recessed portions 114 may be formed into a rectangular array, a mesh, or a concentric ring shape.

[0049] In summary, by providing the first seal 111, the second seal 112, and the third seal 113, a three-step sealing is achieved on the possible diffusion path of the electrolyte. On the other hand, by providing a sealing ring, the electrolyte can be prevented from contaminating the cover through the pole holes of the upper plastic 1, the bare aluminum sheet 5, and the lower plastic 6, thereby preventing the electrolyte from forming an electronic path in the cover, thereby affecting the edge voltage of the lithium battery.

[0050] In a second aspect of the present application, a lithium battery is also proposed, which includes the cover plate and battery body described above to avoid the problem of electrolyte affecting the battery side voltage.

[0051] Finally, it should be noted that the above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A cover plate, characterized in that ,include: an upper plastic body, wherein a sealing portion is provided on the upper plastic body; A plain aluminum sheet, wherein the plain aluminum sheet is provided with a groove adapted to fit the upper plastic body; A sealing ring abutting against the inner wall of the lower plastic pole hole; The sealing portion includes at least a third sealing member, which is connected to the edge of the lower end surface of the upper plastic body and abuts against the bottom of the groove of the smooth aluminum sheet; The upper plastic body and the plain aluminum sheet are sealed and connected via the sealing portion.

2. The cover plate according to claim 1, characterized in that The upper plastic body is embedded in the groove of the smooth aluminum sheet, and the peripheral edge of the upper plastic body is in contact with the groove wall of the groove.

3. The cover plate according to claim 1, characterized in that , the sealing portion further includes: The first sealing member is connected to the peripheral side surface of the upper plastic body and abuts against the upper end surface of the smooth aluminum sheet.

4. The cover plate according to claim 3, characterized in that , the first sealing member is provided with chamfered corners.

5. The cover plate according to claim 1, characterized in that , the sealing portion further includes: The second sealing member is connected to the peripheral side surface of the upper plastic body, and the side of the second sealing member facing away from the upper plastic body abuts against the groove wall of the smooth aluminum sheet groove.

6. The cover plate according to claim 5, characterized in that , one end of the first seal close to the second seal is integrally connected to the second seal.

7. The cover plate according to claim 6, characterized in that , one end of the second seal close to the third seal is integrally connected to the third seal.

8. The cover plate according to claim 1, characterized in that The lower side of the upper plastic body is recessed in a direction away from the light aluminum sheet and is formed with a plurality of recessed portions.

9. The cover plate according to claim 1, characterized in that , the sealing ring includes: Sealing ring body; A first sealing portion is connected to the sealing ring body and abuts against the inner wall of the plastic pole hole; A second sealing portion is connected to the sealing ring body and abuts against the inner wall of the pole hole of the bare aluminum sheet; The third sealing portion is connected to the sealing ring body and abuts against the inner wall of the lower plastic pole hole.

10. A lithium battery, characterized in that ,include: The cover plate according to any one of claims 1 to 9; Battery body.

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