Battery cover plate

Abstract

The utility model discloses a battery cover plate which comprises a cover plate body, a protection sheet arranged on the cover plate body and used for shielding an anti-explosion valve and a ventilation structure penetrating through the protection sheet, and a blocking part is arranged on one side, far away from the cover plate body, of the protection sheet. The blocking part is arranged around the circumferential edge of the protection sheet and is in sealed connection with the protection sheet, the blocking part is used for preventing electrolyte on the cover plate body from flowing into the protection sheet, and at least part of the ventilation structure and the blocking part are arranged in a staggered mode. The explosion-proof valve has the beneficial effect that electrolyte can be prevented from permeating into the explosion-proof valve from the ventilation structure on the protection sheet.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially a battery cover plate. BACKGROUND

[0002] With the continuous development of battery technology, the safety performance of the battery becomes a factor that needs to be considered in the design of the battery. The explosion-proof valve is generally formed on the aluminum plate by one-piece stamping or welding. When the overproduction gas of the battery cell causes the internal gas pressure of the battery cell to exceed the designed value, the explosion-proof valve can timely burst and release pressure, playing a safety role. An explosion-proof valve protection sheet is usually attached to the outside of the explosion-proof valve. The explosion-proof valve protection sheet can prevent foreign matter from falling into the explosion-proof valve area and affecting the performance of the explosion-proof valve. In addition, a through hole is usually formed in the explosion-proof valve protection sheet to ensure that the explosion-proof valve can normally sense the external atmospheric pressure and the explosion-proof valve can normally burst open.

[0003] However, during the battery liquid injection stage, electrolyte overflow often occurs. At this time, the overflowed electrolyte may seep into the explosion-proof valve through the through hole on the explosion-proof valve protection sheet, seriously affecting the safety performance and appearance of the product. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a battery cover plate which can prevent electrolyte from seeping into the explosion-proof valve through the ventilation structure on the protection sheet.

[0005] The utility model is implemented through the following technical solutions.

[0006] A battery cover plate comprises a cover plate body, a protection sheet arranged on the cover plate body for shielding an explosion-proof valve, and a ventilation structure penetrating through the protection sheet. The side of the protection sheet away from the cover plate body is provided with a blocking part. The blocking part is arranged around the circumferential edge of the protection sheet and is in sealed connection with the protection sheet. The blocking part is used for preventing electrolyte on the cover plate body from flowing onto the protection sheet. At least part of the ventilation structure is arranged in a staggered manner with the blocking part.

[0007] As a further improvement of the utility model, the ventilation structure comprises at least one through hole penetrating through the protection sheet.

[0008] As a further improvement of the utility model, the ventilation structure comprises a first through hole and a second through hole penetrating through the protection sheet. The first through hole intersects with the second through hole.

[0009] As a further improvement of the utility model, the middle part of the first through hole intersects with the middle part of the second through hole.

[0010] As a further improvement of the utility model, the first through hole and the second through hole have the same shape.

[0011] As a further improvement of the utility model, the intersection of the first through hole and the second through hole is located at the center position of the protective sheet.

[0012] As a further improvement of the utility model, the height of the blocking part is greater than 2mm.

[0013] As a further improvement of the utility model, the blocking part is pasted on the protective sheet.

[0014] As a further improvement of the utility model, the cover plate body is provided with an explosion-proof valve slot for mounting an explosion-proof valve, and the protective sheet is arranged on the cover plate body and can cover the explosion-proof valve slot.

[0015] As a further improvement of the utility model, the cover plate body is provided with a liquid injection hole.

[0016] The utility model has the advantages of:

[0017] The blocking part is arranged along the circumferential edge of the protective sheet and is sealingly connected with the protective sheet, so that the blocking part can block the electrolyte from flowing onto the protective sheet, thereby preventing the electrolyte from flowing onto the explosion-proof valve through the vent structure on the protective sheet. At the same time, since at least part of the vent structure is arranged in a staggered manner with the blocking part, the explosion-proof valve can normally sense the external air pressure, thereby ensuring the safe use of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0018] The preferred embodiments of the utility model will be described in detail below with reference to the accompanying drawings, which are helpful to understand the purpose and advantages of the utility model, wherein:

[0019] Figure 1 It is a structural schematic view of the utility model;

[0020] Figure 2 It is a side view of Figure 1

[0021] Figure 3 It is a structural schematic view of the protective sheet;

[0022] Figure 4 It is a structural schematic view of the cover plate body. DETAILED DESCRIPTION

[0023] The utility model will be further described in detail below according to the drawings and embodiments.

[0024] ​The up, down, left, right, front, back, front, back, top, bottom and other orientation terms mentioned or possibly mentioned in the specification are defined with respect to the structure shown in the drawings, and the words "inner" and "outer" refer to the direction towards or away from the geometric center of a particular component, which are relative concepts, so it is possible to change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as limiting terms.

[0025] The present embodiment provides a battery cover plate, referring to Figures 1-4 , comprising a cover plate body 1, a protective sheet 2 provided on the cover plate body 1 for shielding the explosion-proof valve, and a ventilation structure 3 penetrating the protective sheet 2, the protective sheet 2 is provided with a blocking part 4 away from one side of the cover plate body 1, the blocking part 4 is arranged along the circumferential edge of the protective sheet 2 and is sealingly connected with the protective sheet 2, the blocking part 4 is used to prevent the electrolyte on the cover plate body 1 from flowing onto the protective sheet 2, and the ventilation structure 3 is at least partially arranged in a staggered manner with the blocking part 4.

[0026] In the present embodiment, the blocking part 4 is arranged along the circumferential edge of the protective sheet 2 and is sealingly connected with the protective sheet 2, in the process of liquid injection, if the electrolyte leaks, the blocking part 4 can block the electrolyte from flowing onto the protective sheet 2, thereby preventing the electrolyte from flowing onto the explosion-proof valve through the ventilation structure 3 on the protective sheet 2, at the same time, since at least part of the ventilation structure 3 is arranged in a staggered manner with the blocking part 4, the explosion-proof valve can normally feel the external air pressure, and the use safety of the battery cell is guaranteed, therefore, the blocking part 4 can not only effectively prevent the electrolyte from entering the explosion-proof valve, but also will not affect the normal feeling of the explosion-proof valve to the external atmospheric pressure.

[0027] In the present embodiment, in order to facilitate the installation of the blocking part 4, the blocking part 4 can be pasted on the protective sheet 2 by sealing glue, during installation, the sealing glue can be evenly applied on the circumferential edge of the protective sheet 2, and then the blocking part 4 is placed on the sealing glue, thereby realizing the sealing connection between the blocking part 4 and the protective sheet 2. At the same time, in order to ensure that the blocking part 4 can effectively block the electrolyte, the blocking part 4 needs to have a certain height, here the height of the blocking part 4 should be greater than 2mm.

[0028] In the embodiment, the ventilation structure includes at least one through hole arranged on the protective sheet 2, and the through hole allows the explosion-proof valve to be affected by the external atmospheric pressure, thereby ensuring that the explosion-proof valve can be normally opened.

[0029] In the embodiment, the first through hole 31 and the second through hole 32 intersect at the middle portions of the first through hole 31 and the second through hole 32, so that the first through hole 31 and the second through hole 32 have a large connection area, which helps to increase the overall structural strength of the protective sheet 2.

[0030] In the embodiment, the intersection of the first through hole 31 and the second through hole 32 is located at the center of the protective sheet 2, thereby further improving the structural stability of the protective sheet 2.

[0031] In the embodiment, the cover plate body 1 is provided with an explosion-proof valve groove 11 for mounting the explosion-proof valve, and the protective sheet 2 is attached to the cover plate body 1 and can cover the explosion-proof valve groove 11, and the explosion-proof valve can be fixed in the explosion-proof valve groove 12 by welding.

[0032] In the embodiment, the cover plate body 1 is provided with a liquid injection hole 12 for injecting electrolyte into the battery cell through the liquid injection hole 12.

[0033] Finally, it should be noted that: the above implementation cases are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing implementation cases, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing implementation cases, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover plate comprising a cover plate body (1), a protection sheet (2) arranged on the cover plate body (1) for shielding an explosion-proof valve, and a ventilation structure (3) penetrating through the protection sheet (2), characterized in that, The protection sheet (2) is provided with a blocking part (4) on the side away from the cover plate body (1), the blocking part (4) is arranged around the circumferential edge of the protection sheet (2) and is sealingly connected with the protection sheet (2), the blocking part (4) is used for preventing the electrolyte on the cover plate body (1) from flowing into the protection sheet (2), and at least part of the ventilation structure (3) is arranged in a staggered manner with the blocking part (4).

2. The battery cover plate of claim 1, wherein, The ventilation structure (3) at least comprises one through hole arranged on the protection sheet (2).

3. A battery cover plate according to claim 1 or 2, c h a r a c t e r i s e d in that The ventilation structure (3) comprises a first through hole (31) and a second through hole (32) arranged on the protection sheet (2), and the first through hole (31) intersects with the second through hole (32).

4. The battery cover plate of claim 3, wherein, The middle part of the first through hole (31) intersects with the middle part of the second through hole (32).

5. The battery cover plate of claim 4, wherein, The first through hole (31) and the second through hole (32) are of the same shape.

6. A battery cover plate according to claim 5, wherein, The intersection of the first through hole (31) and the second through hole (32) is located at the center position of the protection sheet (2).

7. The battery cover plate of claim 1, wherein, The height of the blocking part (4) is greater than 2mm.

8. The battery cover plate of claim 1, wherein, The blocking part (4) is pasted on the protection sheet (2).

9. The battery cover plate of claim 1, wherein, The cover plate body (1) is provided with an explosion-proof valve groove (11) for mounting an explosion-proof valve, and the protection sheet (2) is arranged on the cover plate body (1) and can cover the explosion-proof valve groove (11).

10. The battery cover plate of claim 1, wherein, The cover plate body (1) is provided with a liquid injection hole (12).

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