Battery top cover and power battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery top cover which comprises a cover plate, an anti-explosion valve and a protection piece, a pressure relief hole is formed in the cover plate, a counter bore step is arranged in the pressure relief hole, the anti-explosion valve is arranged on the counter bore step, and a convex-ring-shaped reinforcing part is arranged on one face, away from the counter bore step, of the anti-explosion valve. At least part of the reinforcing part is exposed out of the pressure relief hole, the protection piece is arranged on the reinforcing part, and the edge of the reinforcing part is in sealed connection with the protection piece. The top cover of the explosion-proof valve is high in explosion-proof safety, and the structural strength and the pollution resistance of the explosion-proof valve can be effectively improved. In addition, the utility model also provides a power battery.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery, concretely relates to a battery top cover and power battery. BACKGROUND

[0002] With the rapid development of new energy and energy storage technology, the types of batteries are also increasing. At the same time, in order to enable the battery to achieve safe pressure relief when thermal runaway occurs, the existing battery generally has an explosion-proof valve. However, in the existing battery top cover, the setting position of the explosion-proof valve and the safety protection of the explosion-proof valve are not well considered, and when the liquid injection needle is stretched out from the top cover, the electrolyte is easy to drop on the surface of the top cover, thereby causing the electrolyte to seep into the explosion-proof valve and resulting in the pollution and failure of the explosion-proof valve. Therefore, the existing technology often cannot well prevent the pollution of the explosion-proof valve, and the structural safety of the top cover is usually very poor, and a new technical solution is urgently needed to solve the above problems. SUMMARY

[0003] One of the purposes of the utility model is: in view of the deficiency of the prior art, a battery top cover is provided, which can effectively improve the structural strength and pollution resistance of the explosion-proof valve.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A battery top cover, comprising a cover plate, an explosion-proof valve and a protection piece, the cover plate is provided with a pressure relief hole, the inside of the pressure relief hole is provided with a counterbore step, the explosion-proof valve is arranged on the counterbore step, one side of the explosion-proof valve away from the counterbore step has a convex ring-shaped reinforcing part, at least part of the reinforcing part is exposed to the pressure relief hole, the protection piece is arranged on the reinforcing part, and the edge of the reinforcing part is in sealing connection with the protection piece.

[0006] As an improvement of the battery top cover of the utility model, the explosion-proof valve further comprises a bulge part, the reinforcing part surrounds the bulge part, the bulge part is opposite to the pressure relief hole, and the bulge part is used to improve the pressure relief stability of the explosion-proof valve.

[0007] As an improvement of the battery top cover of the utility model, the explosion-proof valve further comprises a support part, the support part is integrally connected to the bulge part and the reinforcing part respectively, the support part is arranged on the counterbore step, and the support part is used to ensure that the explosion-proof valve is stably arranged on the counterbore step and ensure the stable connection between the explosion-proof valve and the counterbore step.

[0008] As an improvement of the battery top cover of the utility model, the height of the bulge part is slightly greater than or not greater than the height of the reinforcing part, the bulge part is of an elastic structure, the bulge part has an elastic layer, so that the air pressure can be regulated to be released and discharged under a safe pressure.

[0009] As a kind of improvement of the battery top cover of the utility model, at least part of the orthographic projection of the reinforcing portion falls in the counterbore step, to guarantee that the counterbore step has certain supporting and protecting effect on the reinforcing portion, and the reinforcing portion can not hinder the pressure relief of top cover.

[0010] As a kind of improvement of the battery top cover of the utility model, the height of the reinforcing portion exposed to the surface of the cover plate is at least 0.2mm, and the reinforcing portion can block the electrolyte on the surface of the top cover.

[0011] As a kind of improvement of the battery top cover of the utility model, the protection member includes a first sealing portion and a second sealing portion arranged on the first sealing portion, the first sealing portion is connected to the edge of the reinforcing portion through the second sealing portion, the second sealing portion is used to enhance the structural strength of the first sealing portion, and the material of the first sealing portion can be the same as that of the raised portion.

[0012] As a kind of improvement of the battery top cover of the utility model, at least part of the first sealing portion is in sheet structure, and at least part of the second sealing portion is in ring structure, so that the first sealing portion and the second sealing portion can play the role of sealing and anti-pollution protection.

[0013] As a kind of improvement of the battery top cover of the utility model, the thickness of the second sealing portion is not greater than that of the first sealing portion, the thickness of the first sealing portion is T, the depth of the counterbore step is D, and the relationship 0.2≤T / D≤0.6 is met, so that the explosion-proof valve can be controlled and guaranteed to relieve pressure at the most suitable pressure according to the performance of the battery, so that the safety and efficiency of pressure relief of the battery can be optimized.

[0014] The second purpose of the utility model is to provide a power battery comprising the battery top cover as described above.

[0015] The battery top cover of the utility model comprises a cover plate, an explosion-proof valve and a protection member, the cover plate is provided with a pressure relief hole, the pressure relief hole is internally provided with a counterbore step, the explosion-proof valve is arranged on the counterbore step, the counterbore step is used to support the explosion-proof valve, one side of the explosion-proof valve away from the counterbore step is provided with a convex ring-shaped reinforcing portion, at least part of the reinforcing portion is exposed to the pressure relief hole, the convex ring-shaped reinforcing portion can improve the structural strength of the explosion-proof valve and prevent the impurities falling on the surface of the cover plate from polluting the area surrounded by the reinforcing portion, and the protection member is arranged on the reinforcing portion, the edge of the reinforcing portion is sealingly connected with the protection member, so that the area surrounded by the reinforcing portion can be more comprehensively protected, the explosion-proof valve can be safely relieved in a more stable environment, and the operation safety of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a sectional view of one of the faces of the battery top cover of the utility model.

[0017] Fig. 2 is an exploded schematic view of the cover plate, explosion-proof valve and protective piece of the utility model.

[0018] Fig. 3 is a perspective view of the explosion-proof valve of the utility model.

[0019] Fig. 4 is a size schematic view of the counterbore step and first sealing part of the utility model.

[0020] Fig. 5 is an assembly view of the battery top cover of the utility model.

[0021] Wherein: 1, cover plate; 10, pressure relief hole; 11, counterbore step; 2, explosion-proof valve; 20, reinforcing part; 21, raised part; 22, support part; 3, protective piece; 31, first sealing part; 32, second sealing part; T, thickness of the first sealing part; D, depth of the counterbore step; 4, lower plastic; 5, first pole; 6, second pole. DETAILED DESCRIPTION

[0022] As some terms are used in the description and claims, those skilled in the art will understand that manufacturers can use different names to refer to the same component. The description and claims of the present application do not distinguish components by name differences, but by functional differences. As mentioned throughout the description and claims, "comprising" is an open term, which should be interpreted as "comprising but not limited to". "Approximately" means within an acceptable error range, and those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0023] In the utility model, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] The utility model will be further described in detail below in combination with the drawings Figs. 1-5 and specific embodiments, but not as a limitation of the utility model.

[0025] Example 1

[0026] A battery top cover, see Figs. 1-3 , comprising cover plate 1, explosion-proof valve 2 and protection piece 3 arranged in sequence along the vertical direction, wherein the cover plate 1 is provided with pressure relief hole 10, the inside of the pressure relief hole 10 is provided with counterbore step 11, the explosion-proof valve 2 is arranged on the counterbore step 11, the counterbore step 11 is used to support the explosion-proof valve 2, the side of the explosion-proof valve 2 away from the counterbore step 11 has convex ring-shaped reinforcing part 20, at least part of the reinforcing part 20 is exposed to the pressure relief hole 10, the protection piece 3 is arranged on the reinforcing part 20, the edge of the reinforcing part 20 is sealingly connected with the protection piece 3, so that the area surrounded by the reinforcing part can be effectively sealed by assembling, so that the area surrounded by the reinforcing part will not be contaminated by the outside and has better stability.

[0027] Preferably, the explosion-proof valve 2 further comprises bulge part 21, the reinforcing part 20 surrounds the bulge part 21, the bulge part 21 is opposite to the pressure relief hole 10, which can greatly improve the explosion accuracy of the explosion-proof valve 2, thereby improving the safety performance of the battery, and the top surface of the bulge part 21 can abut against the side of the protection piece 3 facing the bulge part 21.

[0028] Preferably, the explosion-proof valve 2 further comprises support part 22, the support part 22 is integrally connected to the bulge part 21 and the reinforcing part 20 respectively, the support part 22 is arranged on the counterbore step 11, and the counterbore step 11 supports and fixes the support part 22 of the explosion-proof valve 2, and the support part 22 can have a circular ring structure.

[0029] Preferably, the bulge part 21 has an elastic structure, and the bulge part 21 ruptures and deflates under a set pressure.

[0030] Preferably, see Fig. 4 , at least part of the orthographic projection of the reinforcing part 20 falls on the counterbore step 11, so as to ensure that the counterbore step 11 has sufficient supporting force on the reinforcing part 20.

[0031] Preferably, the protection piece 3 comprises first sealing part 31 and second sealing part 32 arranged on the first sealing part 31, and the first sealing part 31 is connected to the edge of the reinforcing part 20 through the second sealing part 32, when the protection piece 3 is composed of the first sealing part 31 and the second sealing part 32, the bulge height of the bulge part 21 can be more flexibly adjusted, so that the explosion-proof valve 2 and the protection piece 3 can be designed and assembled flexibly according to various specifications of the battery.

[0032] Preferably, at least part of the first sealing part 31 has a sheet structure, at least part of the second sealing part 32 has a ring structure, and in addition, the first sealing part 31 and the second sealing part 32 can be integrally formed.

[0033] Preferably, the thickness of the second sealing part 32 is not greater than the thickness of the first sealing part 31, and the bulge height of the bulge part 21, the height of the reinforcing part 20 exposed to the surface of the cover plate 1, the thickness of the second sealing part 32 and the thickness of the first sealing part 31 can all be set as required.

[0034] Preferably, referring to Fig. 5 The lower plastic 4 is arranged on the side of the cover plate 1 away from the counterbore step 11, and the cover plate 1 is provided with two pole holes, and the two pole holes are respectively provided with the first pole 5 and the second pole 6.

[0035] Embodiment 2

[0036] Different from embodiment 1, the thickness of the first sealing part 31 is T, the depth of the counterbore step 11 is D, and the following relationship is satisfied: 0.2≤T / D≤0.3, 0.3≤T / D≤0.4, 0.4≤T / D≤0.5 or 0.5≤T / D≤0.6, so that the structural strength of the explosion-proof valve 2 and the protection part 3 can be flexibly controlled.

[0037] Preferably, the height of the reinforcing part 20 exposed on the surface of the cover plate 1 is at least 0.2 mm, the reinforcing part 20 can be used as a convex, and the reinforcing part 20 can be used as a reinforcing rib to improve the strength of the explosion-proof valve 2, which is beneficial to directional explosion when the explosion-proof valve 2 is in a pressure relief state, and can prevent electrolyte from seeping from the edge of the explosion-proof valve 2, thereby improving the anti-pollution capability.

[0038] The other structures of the embodiment are the same as those of embodiment 1, and will not be described here.

[0039] Embodiment 3

[0040] Different from embodiment 1 or 2, the first sealing part 31 is connected to the edge of the reinforcing part 20 through the second sealing part 32, the second sealing part 32 is sleeved on the outside of the reinforcing part 20, and the inside of the second sealing part 32 and the outside of the reinforcing part 20 are connected through internal and external thread sealing.

[0041] The other structures of the embodiment are the same as those of embodiment 1 or 2, and will not be described here.

[0042] Embodiment 4

[0043] A power battery includes the battery top cover of any one of embodiments 1 to 3, wherein the power battery can be a square cell, a cylindrical cell or the like, and the battery can be a lithium ion battery, a sodium ion battery or a magnesium ion battery or the like.

[0044] Based on the disclosure and teaching of the above description, those skilled in the art of the utility model can also make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the above specific embodiments, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the utility model.

Claims

1. A battery top cover characterized by, The application relates to a battery top cover, which comprises a cover plate (1) provided with a pressure relief hole (10) with a counterbore step (11) inside; an explosion-proof valve (2) arranged on the counterbore step (11), the explosion-proof valve (2) being provided with a convex ring-shaped reinforcing part (20) on the side away from the counterbore step (11), at least part of the reinforcing part (20) being exposed to the pressure relief hole (10); and a protective part (3) arranged on the reinforcing part (20), the edge of the reinforcing part (20) being sealingly connected with the protective part (3). The explosion-proof valve (2) further comprises a raised part (21), the reinforcing part (20) surrounds the raised part (21), and the raised part (21) is directly opposite the pressure relief hole (10). The explosion-proof valve (2) further comprises a supporting part (22) integrally connected with the raised part (21) and the reinforcing part (20) respectively, and the supporting part (22) is arranged on the counterbore step (11). The raised part (21) is of an elastic structure.

2. The battery cup of claim 1, wherein: At least part of the projection of the reinforcing part (20) falls on the counterbore step (11).

3. The battery cover of claim 2, wherein: The height of the reinforcing part (20) exposed to the surface of the cover plate (1) is at least 0.2 mm.

4. The battery cover of any of claims 2-3, wherein: The protective part (3) comprises a first sealing part (31) and a second sealing part (32) arranged on the first sealing part (31), the first sealing part (31) is connected with the edge of the reinforcing part (20) through the second sealing part (32).

5. The battery cover of any one of claims 1-3, wherein: At least part of the first sealing part (31) is of a sheet structure, and at least part of the second sealing part (32) is of a ring structure.

6. The battery cover of any one of claims 1-3, wherein: The thickness of the second sealing part (32) is not greater than the thickness of the first sealing part (31), the thickness of the first sealing part (31) is T, the depth of the counterbore step (11) is D, and the relationship 0.2<=T / D<=0.6 is met.

7. The battery cover of any one of claims 1-3, wherein: The application further relates to a battery top cover comprising the battery top cover as claimed in any one of claims 1 to 9.

8. The battery cup of claim 7, wherein: ​ 9. The battery cover of claim 7, wherein: ​ 10. A power cell, characterized by: ​

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