Battery cover plate assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate assembly and a single battery, the battery cover plate assembly comprises a cover plate body, an insulating part and a positive pole assembly, the positive pole assembly comprises a positive pole column and an elastic conductive part, the positive pole column comprises a first end and a second end, the first end abuts against the insulating part, and the second end abuts against the elastic conductive part. The second end sequentially penetrates through the insulating part, the cover plate body and the elastic conductive part in a sealing manner and is in limiting connection with the elastic conductive part; the elastic conductive piece is arranged between the second end and the cover plate body in an abutting and compressing mode. According to the battery cover plate assembly, the positive pole and the cover plate body can be elastically and electrically connected, so that good contact between the positive pole and the cover plate body is ensured after the cover plate body is deformed, and the resistance stability of the single battery is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover assembly and a single battery. Background Art

[0002] At present, single cells usually set the positive electrode and the shell of the battery cover assembly to a full conduction or weak conduction state, achieving equipotential between the positive electrode and the shell of the battery to increase the voltage between the negative electrode and the shell of the battery, so as to prevent the hidden dangers of battery corrosion, battery capacity attenuation, and reduced cycle performance and rate performance of lithium-ion batteries caused by the charged shell, thereby improving the safety and service life of lithium batteries.

[0003] In the existing battery cover assembly, the resistance between the positive electrode aluminum block and the cover is mainly adjusted by conductive plastic, stainless steel and other hard materials. However, when the battery, battery module and / or battery pack are subsequently tested, the battery cover may be deformed, resulting in unstable contact between the positive electrode and the cover, increased resistance, and abnormal battery shell voltage; in addition, after the battery has been used for a period of time, when the gas production inside the battery reaches a certain pressure, the battery cover will also be deformed, resulting in unstable contact between the positive electrode and the cover, and resistance changes, which will cause abnormal battery shell voltage.

[0004] Therefore, there is an urgent need for a battery cover assembly and a single battery to solve the above technical problems. Utility Model Content

[0005] One purpose of the utility model is to provide a battery cover assembly, which can make the positive pole and the cover body elastically electrically connected, so as to ensure that the positive pole and the cover body are still in good contact after the cover body is deformed, thereby ensuring the resistance stability of the single battery.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery cover assembly includes a cover body, an insulating member and a positive electrode assembly, wherein the positive electrode assembly includes a positive electrode column and an elastic conductive member, wherein:

[0008] The positive electrode column comprises a first end and a second end, the first end abuts against the insulating member, and the second end is sequentially sealed and penetrates through the insulating member, the cover body and the elastic conductive member and is position-limitedly connected to the elastic conductive member;

[0009] The elastic conductive member is abutted and compressed between the second end and the cover body.

[0010] Optionally, the elastic conductive member includes an abutment portion and a covering portion connected to each other, the abutment portion is abutted and compressed between the second end and the cover body, the covering portion is vertically arranged at the periphery of the abutment portion, and the covering portion covers at least a portion of the periphery of the second end.

[0011] Optionally, the initial thickness of the elastic conductive member is D, the compression amount of the elastic conductive member is D1, and 10%D≤D1≤50%D.

[0012] Optionally, the positive electrode column is an integrally formed structure, and the positive electrode column comprises a connecting portion and a fixing portion, one end of the connecting portion is sequentially sealed and penetrated through the insulating member, the cover plate body and the elastic conductive member and is riveted with the elastic conductive member to form the fixing portion; or,

[0013] The positive electrode column is a split structure, and includes a main body and a fixed block. The main body is sequentially sealed and penetrated through the insulating member, the cover body, the elastic conductive member and the fixed block and is fixedly connected to the fixed block.

[0014] Optionally, a mounting hole is provided on the cover body, a connecting hole is provided on the insulating member, a through hole is provided on the elastic conductive member, and the second end is sequentially sealed and penetrated through the connecting hole, the mounting hole and the through hole and is limit-connected to the elastic conductive member.

[0015] Optionally, a sealing member is further included, wherein the sealing member is abutted and compressed between the outer periphery of the positive electrode column and the mounting hole, and the sealing member abuts between the elastic conductive member and the insulating member.

[0016] Optionally, the sealing member is an elastic conductive sealing structure.

[0017] Optionally, the sealing component and the elastic conductive component are integrally formed.

[0018] Optionally, a negative electrode assembly is further included, and the negative electrode assembly is insulated and arranged on the cover body.

[0019] Another object of the utility model is to provide a single cell battery, which can make the rivet block and the cover body elastically electrically connected, so as to ensure that after the cover body is deformed, the positive electrode column and the cover body are still in good contact, thereby ensuring the resistance stability of the single cell battery.

[0020] To achieve this purpose, the utility model adopts the following technical solutions:

[0021] The single cell comprises a shell, a core pack and the battery cover assembly. The core pack is arranged in the shell, and the battery cover assembly is sealed at the opening of the shell.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a battery cover assembly and a single cell. By changing the conductive member between the second end and the cover body into an elastic conductive member, when the battery cover assembly is assembled, the elastic conductive member can be abutted and compressed between the second end and the cover body, so that when the single cell loaded with the battery cover assembly is subjected to various measurements and subsequent use, after the cover body is deformed due to external force, the elastic conductive member can automatically fill the gap between the second end of the positive pole and the cover body caused by the deformation of the cover body, thereby ensuring that the effective contact area between the positive pole and the cover body meets the requirements, ensuring the resistance stability of the single cell, and thus improving the safety and stability of the single cell loaded with the battery cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric view of a battery cover assembly provided in a specific embodiment of the utility model;

[0025] Figure 2 It is a top view of a battery cover assembly provided by a specific embodiment of the utility model;

[0026] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0027] Figure 4 yes Figure 3 A partial enlarged view of the positive electrode assembly in some embodiments at B;

[0028] Figure 5 yes Figure 3 Partially enlarged view of the positive electrode assembly in other embodiments at B.

[0029] In the figure:

[0030] 10. Cover plate body; 20. Insulating member;

[0031] 30. positive electrode assembly; 31. positive electrode column; 311. main body; 312. fixing block; 32. elastic conductive member; 321. abutting portion; 322. covering portion; 33. sealing member;

[0032] 40. Negative electrode assembly; 50. Liquid injection structure; 60. Explosion-proof structure. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] Refer to the following Figures 1 to 5 The utility model discloses a battery cover assembly.

[0038] Please refer to Figures 1 to 5 Specifically, the battery cover assembly includes a cover body 10, an insulating member 20 and a positive electrode assembly 30, the positive electrode assembly 30 includes a positive electrode column 31 and an elastic conductive member 32, wherein the positive electrode column 31 includes a first end and a second end, the first end abuts against the insulating member 20, the second end is sealed and penetrated through the insulating member 20, the cover body 10 and the elastic conductive member 32 in sequence and is limitedly connected to the elastic conductive member 32; the elastic conductive member 32 is abutted and compressed between the second end and the cover body 10.

[0039] The battery cover assembly in the present embodiment changes the conductive member between the second end and the cover body 10 into an elastic conductive member 32, so that when the battery cover assembly is assembled, the elastic conductive member 32 can be abutted and compressed between the second end and the cover body 10, so that when the single battery loaded with the battery cover assembly is subjected to various measurements and subsequent use, after the cover body 10 is deformed due to external force, the elastic conductive member 32 can automatically fill the gap between the second end of the positive electrode column 31 and the cover body 10 caused by the deformation of the cover body 10, ensuring that the effective contact area between the positive electrode column 31 and the cover body 10 meets the requirements, ensuring the resistance stability of the single battery, and thereby improving the safety and stability of the single battery loaded with the battery cover assembly.

[0040] Specifically, a mounting hole is provided on the cover body 10, a connecting hole is provided on the insulating member 20, and a through hole is provided on the elastic conductive member 32. The second end is sealed and penetrated through the connecting hole, the mounting hole and the through hole in sequence and is limitedly connected to the elastic conductive member 32, thereby realizing the connection between the positive electrode column 31, the insulating member 20, the cover body 10 and the elastic conductive member 32.

[0041] Please refer to Figure 4 and Figure 5 In some embodiments, the positive electrode column 31 is an integrally formed structure, and the positive electrode column 31 includes a connecting portion and a fixing portion. One end of the connecting portion is sealed and penetrated through the insulating member 20, the cover body 10 and the elastic conductive member 32 in sequence and is riveted with the elastic conductive member 32 to form a fixing portion, thereby realizing a fixed connection between the positive electrode column 31 and the insulating member 20, the cover body 10 and the elastic conductive member 32, and at the same time, the elastic conductive member 32 is abutted and compressed between the cover body 10 and the second end.

[0042] In some embodiments, the positive electrode column 31 is a split structure, and the positive electrode column 31 includes a main body 311 and a fixed block 312. The main body 311 is sealed and penetrated through the insulating member 20, the cover body 10, the elastic conductive member 32 and the fixed block 312 in sequence and is fixedly connected to the fixed block 312, so that the positive electrode column 31 can be fixedly connected with the insulating member 20, the cover body 10 and the elastic conductive member 32, and at the same time, the elastic conductive member 32 is abutted and compressed between the cover body 10 and the second end.

[0043] In some embodiments, the elastic conductive member 32 includes an abutment portion 321 and a covering portion 322 that are connected to each other. The abutment portion 321 is abutted and compressed between the second end and the cover body 10, and the covering portion 322 is vertically arranged on the outer periphery of the abutment portion 321. The covering portion 322 covers at least part of the outer periphery of the second end, which can not only realize the elastic electrical connection between the second end of the positive electrode column 31 and the cover body 10, but also cover the positive electrode column 31 to fix and limit the circumference of the positive electrode column 31.

[0044] Optionally, the initial thickness of the elastic conductive member 32 is D, the compression amount of the elastic conductive member 32 is D1, 10%D≤D1≤50%D, so that the elastic conductive member 32 is in full contact with the second end of the positive electrode column 31 and the cover body 10 during installation.

[0045] It should be noted that the compression amount D2 is equal to the value of the thickness D3 of the elastic conductive member 32 after installation minus the initial thickness D.

[0046] Optionally, the thickness of the elastic conductive member 32 is generally selected to be between 1 mm and 2 mm to achieve the conductivity and elasticity of the elastic conductive member 32 .

[0047] Please refer to Figure 4 In some embodiments, the battery cover assembly also includes a seal 33, which is abutted and compressed between the outer periphery of the positive electrode column 31 and the mounting hole, and abutted between the elastic conductive member 32 and the insulating member 20 to achieve sealing between the positive electrode column 31 and the cover body 10, and the seal 33 abuts between the elastic conductive member 32 and the insulating member 20, so as to achieve sealing between the positive electrode column 31 and the elastic conductive member 32 and sealing between the positive electrode column 31 and the insulating member 20.

[0048] Optionally, the seal 33 is an elastic conductive sealing structure, which further increases the electrical connection area between the cover body 10 and the positive electrode column 31, ensuring that the cover body 10 and the positive electrode column 31 can still be stably electrically connected after the cover body 10 is deformed.

[0049] Further optionally, the elastic conductive member 32 and the sealing member 33 are both fluororubber conductive sealing rings or silicone conductive sealing rings, so as to achieve the conductivity, sealing and elasticity of both.

[0050] Please refer to Figure 5 In some embodiments, the seal 33 is integrally formed with the elastic conductive sealing structure and the elastic conductive member 32, which reduces the number of parts and further increases the electrical connection area between the cover body 10 and the positive electrode column 31.

[0051] Please refer to Figures 1 to 3 In some embodiments, the battery cover assembly further includes a negative electrode assembly 40, which is insulated and arranged on the cover body 10, so as to realize the use of a single battery that only needs to be provided with one battery cover assembly, so as to facilitate the electrical connection between the single battery and the outside. It should be noted that when the single battery is provided with two battery cover assemblies, the positive electrode assembly 30 or the negative electrode assembly 40 is respectively arranged on the two battery cover assemblies.

[0052] It should be noted that the structure of the negative electrode assembly 40 is similar to that of the positive electrode assembly 30 , and only the elastic conductive member 32 needs to be replaced with an insulating structure, which will not be described in detail here.

[0053] In some embodiments, the battery cover assembly further includes a liquid injection structure 50 , which is disposed on the cover body 10 , and the liquid injection structure 50 is used to inject liquid into the interior of the single battery.

[0054] In some embodiments, the battery cover assembly further includes an explosion-proof structure 60 , which is disposed on the cover body 10 . The explosion-proof structure 60 is used to control the pressure relief of the internal pressure of the single battery.

[0055] This embodiment also provides a single cell, which includes a shell, a core pack and a battery cover assembly as described in any of the above schemes, wherein the core pack is arranged in the shell, and the battery cover assembly is sealed at the opening of the shell. The single cell has all the beneficial effects of the battery cover assembly as described in any of the above schemes, which will not be described in detail here.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery cover assembly, characterized in that: The invention comprises a cover plate body (10), an insulating member (20) and a positive electrode assembly (30), wherein the positive electrode assembly (30) comprises a positive electrode column (31) and an elastic conductive member (32), wherein: The positive electrode column (31) comprises a first end and a second end, the first end abuts against the insulating member (20), and the second end is sequentially sealed and penetrates through the insulating member (20), the cover plate body (10) and the elastic conductive member (32) and is position-limitedly connected to the elastic conductive member (32); The elastic conductive member (32) is disposed in abutment and compression between the second end and the cover plate body (10).

2. The battery cover assembly according to claim 1, characterized in that: The elastic conductive member (32) comprises an abutting portion (321) and a covering portion (322) connected to each other, wherein the abutting portion (321) is arranged between the second end and the cover plate body (10) in abutting and compression manner, and the covering portion (322) is arranged vertically on the periphery of the abutting portion (321), and the covering portion (322) covers at least a portion of the periphery of the second end.

3. The battery cover assembly according to claim 1, characterized in that: The initial thickness of the elastic conductive member (32) is D, the compression amount of the elastic conductive member (32) is D1, and 10%D≤D1≤50%D.

4. The battery cover assembly according to claim 1, characterized in that: The positive electrode column (31) is an integrally formed structure, and comprises a connecting portion and a fixing portion, one end of the connecting portion being sealed and penetrated through the insulating member (20), the cover plate body (10) and the elastic conductive member (32) in sequence and riveted to the elastic conductive member (32) to form the fixing portion; or, The positive electrode column (31) is a split structure, comprising a main body (311) and a fixing block (312), wherein the main body (311) is sequentially sealed and penetrated through the insulating member (20), the cover body (10), the elastic conductive member (32) and the fixing block (312), and is fixedly connected to the fixing block (312).

5. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The cover plate body (10) is provided with a mounting hole, the insulating member (20) is provided with a connecting hole, the elastic conductive member (32) is provided with a through hole, and the second end is sequentially sealed and penetrated through the connecting hole, the mounting hole and the through hole and is positionally connected to the elastic conductive member (32).

6. The battery cover assembly according to claim 5, characterized in that: The positive electrode assembly (30) further comprises a sealing member (33), wherein the sealing member (33) is arranged in abutment and compression between the outer periphery of the positive electrode column (31) and the mounting hole, and the sealing member (33) is in abutment between the elastic conductive member (32) and the insulating member (20).

7. The battery cover assembly according to claim 6, characterized in that: The sealing member (33) is an elastic conductive sealing structure.

8. The battery cover assembly according to claim 7, characterized in that: The sealing member (33) and the elastic conductive member (32) are integrally formed.

9. The battery cover assembly according to claim 1, characterized in that: It also includes a negative electrode assembly (40), wherein the negative electrode assembly (40) is insulated and arranged on the cover plate body (10).

10. A single cell, characterized in that: It comprises a shell, a core pack and a battery cover assembly as described in any one of claims 1 to 9, wherein the core pack is arranged in the shell, and the battery cover assembly is sealed at the opening of the shell.

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