Cover plate assembly of battery and battery

Abstract

A cover plate assembly of a battery and a battery, the cover plate assembly (100) of a battery comprising: a cover body (10), the cover body (10) being provided with a mounting hole (11); a fixing member (20), the fixing member (20) passing through the mounting hole (11), and the fixing member (20) being provided with a through hole (21); and an explosion-proof valve (30), the explosion-proof valve (30) being provided in the through hole (21) and blocking the through hole (21).

Description

Battery cover assembly and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311279978.1 and application date September 28, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and more particularly, to a battery cover assembly and a battery. Background Art

[0004] With the development of modern society and the enhancement of environmental awareness, more and more devices choose to use batteries as power sources. In the related art, the connection between the battery cover body and the explosion-proof valve is unreliable, which is prone to safety hazards.

[0005] Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery cover assembly that can ensure that the explosion-proof valve is securely fixed, has a simple manufacturing process, and is easy to process and manufacture.

[0007] Another object of the present application is to provide a battery having the above-mentioned battery cover assembly.

[0008] According to an embodiment of the present application, the cover plate assembly of the battery includes: a cover body, which is provided with a mounting hole; a fixing member, which is passed through the mounting hole and is provided with a through hole; and an explosion-proof valve, which is provided in the through hole and blocks the through hole.

[0009] According to the cover plate assembly of the battery in the embodiment of the present application, a fixing piece is passed through the mounting hole of the cover body, and the explosion-proof valve is arranged in the through hole of the fixing piece and blocks the through hole, so that the explosion-proof valve can be reliably fixed on the cover body, avoiding the problem of unreliable connection caused by welding the explosion-proof valve to the cover body in related technologies. The manufacturing process is simple, and the cover plate assembly is easy to be processed and manufactured, which can ensure the safety of battery use.

[0010] In addition, the cover assembly of the battery according to the above embodiment of the present application may also have the following additional technical features:

[0011] According to the cover plate assembly of the battery in some embodiments of the present application, the fixing part includes: a fixing body, the fixing body is passed through the mounting hole, and the through hole is provided on the fixing body; a first abutment portion and a second abutment portion, the first abutment portion and the second abutment portion are respectively provided at both ends of the length direction of the fixing body, the first abutment portion is located on the side of the second abutment portion away from the interior of the battery, the first abutment portion and the second abutment portion both extend along the circumferential direction of the fixing body, the side of the first abutment portion and the second abutment portion facing the cover body respectively abut against both sides of the cover body in the thickness direction, and the explosion-proof valve is supported on the fixed body and the first abutment portion.

[0012] According to some embodiments of the present application, a support boss is provided on the side of the first abutment portion away from the interior of the battery, and the support boss is formed into a ring extending in the circumferential direction of the fixed body. The explosion-proof valve is located on the inner side of the support boss, and the cover plate assembly also includes a protective member, which is provided on the support boss.

[0013] According to some embodiments of the present application, the protective member and the explosion-proof valve are spaced apart in the axial direction of the mounting hole.

[0014] According to some embodiments of the present application, the cover assembly of the battery further includes: an upper plastic, which is arranged on the side of the cover body facing the outside of the battery, and has an avoidance hole opposite to and connected to the mounting hole. The fixing piece is passed through the avoidance hole, and the first abutting portion abuts against the upper plastic.

[0015] According to some embodiments of the present application, the battery cover assembly further includes: a lower plastic, which is provided on a side of the cover body facing the interior of the battery, and the lower plastic is provided around the second abutting portion.

[0016] According to some embodiments of the present application, a sealing member is provided between the inner peripheral wall of the mounting hole and the fixing member.

[0017] According to some embodiments of the present application, a bending portion is provided on the wall of the mounting hole, and the bending portion bends and extends toward the outside of the battery and close to the axial direction of the mounting hole. A sealing portion that cooperates with the bending portion is provided on the sealing member.

[0018] According to some embodiments of the present application, at least one of the fixing member and the explosion-proof valve is an aluminum member; and / or the cover body is a steel member or an aluminum member.

[0019] A battery according to an embodiment of the present application includes the cover plate assembly of the battery according to the embodiment of the present application.

[0020] According to the battery of the embodiment of the present application, a fixing member is passed through the mounting hole of the cover body, and the explosion-proof valve is arranged in the through hole of the fixing member and blocks the through hole, so that the explosion-proof valve can be reliably fixed on the cover body, avoiding the problem of unreliable connection caused by welding the explosion-proof valve to the cover body in the related art. The manufacturing process is simple, and the cover plate assembly is easy to be processed and manufactured, which can ensure the safety of battery use.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] FIG1 is a schematic structural diagram of a cover plate assembly according to an embodiment of the present application;

[0024] FIG2 is a side view of a cover plate assembly according to an embodiment of the present application;

[0025] FIG3 is a cross-sectional view of a cover plate assembly according to an embodiment of the present application;

[0026] FIG4 is a partial cross-sectional view of a cover plate assembly according to an embodiment of the present application;

[0027] FIG5 is a partial cross-sectional view of a cover plate assembly according to an embodiment of the present application, wherein the explosion-proof valve and the protective member are not shown;

[0028] FIG6 is a partial cross-sectional view of a cover plate assembly according to an embodiment of the present application, wherein the fixing member is in an unassembled state;

[0029] FIG7 is a schematic structural diagram of a fixing member of a cover plate assembly according to an embodiment of the present application, wherein the fixing member is in an assembled state;

[0030] FIG8 is a schematic structural diagram of a fixing member of a cover plate assembly according to an embodiment of the present application, wherein the fixing member is in an unassembled state;

[0031] FIG9 is a schematic structural diagram of a sealing member of a cover assembly according to an embodiment of the present application.

[0032] Figure numerals: 100, cover plate assembly; 10, cover body; 11, mounting hole; 12, bending portion; 13, fitting part; 20, fixing part; 21, through hole; 22, supporting boss; 201, fixing body; 202, first abutting portion; 203, second abutting portion; 221, first sinking platform; 222, second sinking platform; 30, explosion-proof valve; 31, protective part; 41, upper plastic; 42, lower plastic; 43, sealing part; 411, avoidance hole; 431, sealing part; 50, pole; 51, rivet block. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In the description of this application, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0036] The cap plate assembly 100 of a battery according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0037] 1 to 6 , a cover plate assembly 100 of a battery according to an embodiment of the present application may include: a cover body 10 , a fixing member 20 and an explosion-proof valve 30 .

[0038] Specifically, the cover body 10 is provided with a mounting hole 11, and the fixing member 20 is inserted into the mounting hole 11, so that the fixing member 20 can be installed on the cover body 10. The fixing member 20 is provided with a through hole 21, and the explosion-proof valve 30 is disposed within the through hole 21. The explosion-proof valve 30 blocks the through hole 21. In the event of thermal runaway of the battery, the explosion-proof valve 30 can be used to relieve pressure and vent the battery, releasing internal pressure and ensuring the safety of the battery. For example, the explosion-proof valve 30 can be connected to the fixing member 20 by bonding.

[0039] At the same time, the explosion-proof valve 30 is fixed to the cover body 10 by the fixing member 20, which can ensure that the explosion-proof valve 30 is reliably fixed on the cover body 10, has a simple manufacturing process, a reliable installation structure, and low risk, and is convenient for processing and manufacturing the cover plate assembly 100, avoiding the problems of unreliable connection caused by welding the explosion-proof valve and the cover body in related technologies, and can ensure the safety of battery use.

[0040] In some embodiments, at least one of the fixing member 20 and the explosion-proof valve 30 is an aluminum member, that is, the fixing member 20 can be an aluminum member, which can make the fixing member 20 have good structural strength and light weight, which is beneficial to reducing the overall weight of the battery; or, the explosion-proof valve 30 can be an aluminum member. Compared with the explosion-proof valve made of steel in the related art, the explosion-proof valve 30 made of aluminum has a low burst value, which can ensure that the battery opening pressure is stable and reliable, which is beneficial to reducing risks and making the battery safer; or, the fixing member 20 and the explosion-proof valve 30 can both be aluminum members, which is beneficial to reducing the overall weight of the battery and ensuring that the battery opening pressure is stable and reliable, so that the battery has better safety.

[0041] In some embodiments, the cover body 10 may be made of aluminum. The tensile strength of the aluminum cover body 10 may be 100 MPa-250 MPa. For example, when the wall thickness of the cover body 10 is 0.5 mm, the compressive strength of the cover body 10 may be 1.3 MPa-1.6 MPa, which can meet the use requirements of the cover body 10 and thus meet the protection requirements of the battery. Alternatively, the cover body 10 may be made of steel. A steel cover body 10 can improve the overall compressive strength of the battery and reduce the risk of thermal runaway. For example, the cover body 10 may be made of a plain aluminum sheet.

[0042] In some specific embodiments, the cover body 10 is made of steel and the explosion-proof valve 30 is made of aluminum, which can ensure that the opening pressure of the battery is stable and reliable, which is conducive to reducing risks and making the battery have better safety. The explosion-proof valve 30 is installed on the cover body 10 through the fixing part 20, which can avoid the problems of low welding yield caused by the cover body 10 and the explosion-proof valve 30 being connected by welding, and avoid the occurrence of obvious explosion points, cold welding and other phenomena, ensuring that the explosion-proof valve 30 is reliably fixed on the cover body 10, and can ensure the safety of battery use.

[0043] According to the cover plate assembly 100 of the embodiment of the present application, the fixing member 20 is passed through the mounting hole 11 of the cover body 10, and the explosion-proof valve 30 is arranged in the through hole 21 of the fixing member 20 and blocks the through hole 21, so that the explosion-proof valve 30 can be reliably fixed on the cover body 10, avoiding the problems of unreliable connection caused by welding the explosion-proof valve and the cover body in the related art, and the manufacturing process is simple, which facilitates the processing and manufacturing of the cover plate assembly 100, and can ensure the safety of battery use.

[0044] In some embodiments of the present application, as shown in Figures 4 to 7, the fixing member 20 may include a fixing body 201, a first abutting portion 202 and a second abutting portion 203. The fixing body 201 is passed through the mounting hole 11, and the through hole 21 is provided on the fixing body 201. The first abutting portion 202 and the second abutting portion 203 are respectively provided at both ends of the length direction of the fixing body 201 (for example, the up and down directions shown in Figure 4). The first abutting portion 202 is located on the side of the second abutting portion 203 away from the interior of the battery (for example, the upper side shown in Figure 4). The first abutting portion 202 and the second abutting portion 203 both extend along the circumferential direction of the fixing body 201. The first abutting portion 202 and the second abutting portion 203 can improve the structural strength of the fixing member 20 and avoid deformation and other problems.

[0045] In addition, as shown in Figures 4 to 7, the sides of the first abutting portion 202 and the second abutting portion 203 facing the cover body 10 respectively abut against both sides of the cover body 10 in the thickness direction (e.g., the up-down direction shown in Figure 4), which enables the fixing member 20 to be supported on the cover body 10 and is not likely to fall off, and the fixing member 20 is securely fixed to the cover body 10. At the same time, the explosion-proof valve 30 is supported on the fixing body 201 and the first abutting portion 202, which can meet the support requirements of the fixing member 20 for the explosion-proof valve 30, so that the explosion-proof valve 30 can be securely fixed to the cover body 10 through the fixing member 20, ensuring the safety of battery use.

[0046] In some embodiments, the second abutment portion 203 and the fixed body 201 are formed into a straight cylindrical shape as shown in Figures 6 and 8. After the second abutment portion 203 and the fixed body 201 are passed through the mounting hole 11, as shown in Figures 5 and 7, the second abutment portion 203 is flanged and pressed to achieve the abutment between the second abutment portion 203 and the cover body 10, which facilitates the installation of the fixing part 20, makes assembly more convenient, and can ensure that the fixing part 20 has good structural strength to meet the required usage requirements.

[0047] It should be noted that, for the convenience of description, the directions such as "upper" and "lower" in this application are based on the direction relationship shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0048] According to some embodiments of the present application, as shown in Figures 4-7 , a support boss 22 is provided on the side of the first abutting portion 202 away from the interior of the battery. The support boss 22 is formed in a ring shape and extends along the circumferential direction of the fixed body 201. The explosion-proof valve 30 is located on the inner side of the support boss 22. The support boss 22 can limit the position of the explosion-proof valve 30 on the fixing member 20, ensuring that the explosion-proof valve 30 is securely fixed to the fixing member 20. In addition, the cover plate assembly 100 also includes a protective member 31, which is provided on the support boss 22. The protective member 31 can protect the explosion-proof valve 30 and prevent the explosion-proof valve 30 from being exposed and damaged.

[0049] In some embodiments of the present application, as shown in FIG4 , the protective member 31 and the explosion-proof valve 30 are spaced apart in the axial direction of the mounting hole 11 (for example, the up and down direction shown in FIG4 ), so that the protective member 31 can be separated from the explosion-proof valve 30 to prevent the protective member 31 from contacting the explosion-proof valve 30 and causing damage to the explosion-proof valve 30, thereby ensuring the safety of battery use.

[0050] In some embodiments, as shown in Figures 4 to 7, a first sunken platform 221 and a second sunken platform 222 are provided on the support boss 22, the first sunken platform 221 is located on the side of the second sunken platform 222 away from the first abutting portion 202 (for example, the upper side shown in Figure 4), and the inner side wall of the first sunken platform 221 is located on the side of the inner side wall of the second sunken platform 222 away from the axial direction of the mounting hole 11, so that the first abutting portion 202, the second sunken platform 222 and the first sunken platform 221 can be formed into a step shape, which is convenient for processing and manufacturing the fixing member 20. The protective member 31 is provided on the first sunken platform 221, and the protective member 31 can be limited by the first sunken platform 221 to ensure that the protective member 31 is reliably fixed on the fixing member 20, and can meet the requirement of spacing the protective member 31 and the explosion-proof valve 30, thereby ensuring the safety of the battery.

[0051] According to some embodiments of the present application, as shown in Figures 3 to 6, the cover assembly 100 further includes an upper plastic 41, which is disposed on the side of the cover body 10 facing the outside of the battery (the upper side as shown in Figure 4). The upper plastic 41 has an escape hole 411, which is opposite to and connected to the mounting hole 11. The escape hole 411 can escape the fixing member 20, allowing the fixing member 20 to pass through the escape hole 411 and the mounting hole 11, ensuring that the fixing member 20 is securely fixed to the cover body 10. At the same time, the first abutting portion 202 abuts against the upper plastic 41, and the upper plastic 41 can insulate the cover body 10 and the fixing member 20, avoiding electrical conduction between them and causing safety hazards, thereby ensuring the safety of the battery.

[0052] In some embodiments of the present application, as shown in Figures 3-6 , the cover assembly 100 further includes a lower plastic 42 , which is disposed on the side of the cover body 10 facing the interior of the battery (e.g., the lower side shown in Figure 4 ). The lower plastic 42 insulates the cover body 10 and the fixing member 20 , preventing electrical conduction between them and potentially causing safety hazards, thereby ensuring the safety of the battery. Furthermore, the lower plastic 42 surrounds the second abutting portion 203 , limiting the position of the second abutting portion 203 and, therefore, limiting the position of the fixing member 20 , ensuring that the fixing member 20 is securely fixed to the cover body 10 .

[0053] In some embodiments, a seal 43 is provided between the inner wall of the mounting hole 11 and the fixing member 20. The seal 43 can prevent the electrolyte from flowing out of the battery through the gap between the hole wall of the mounting hole 11 and the fixing member 20, and prevent external liquids from entering the battery through the gap between the hole wall of the mounting hole 11 and the fixing member 20, thereby ensuring the sealing of the battery and ensuring the normal use of the battery.

[0054] In some specific embodiments, as shown in Figures 6 and 8, the cover assembly 100 includes a cover body 10, an upper plastic 41, a lower plastic 42, a fixing part 20 and an explosion-proof valve 30, the fixing part 20 includes a fixing body 201, a first abutting portion 202 and a second abutting portion 203, a through hole 21 is provided on the fixing body 201, the first abutting portion 202 and the second abutting portion 203 are respectively provided at both ends of the length direction of the fixing body 201, and the first abutting portion 202 extends along the circumferential direction of the fixing body 201, the second abutting portion 203 and the fixing body 201 are formed into a straight cylindrical shape, and the upper plastic 41 has an avoidance hole 411 opposite to and connected to the mounting hole 11.

[0055] The upper plastic member 41 is positioned on one side of the cover body 10. The second abutting portion 203 and the fixed body 201 are inserted from one side of the cover body 10 through the mounting hole 11 and the avoidance hole 411. The first abutting portion 202 faces the side of the cover body 10 and abuts against the side of the cover body 10, allowing the first abutting portion 202 and the cover body 10 to press against the upper plastic member 41. The explosion-proof valve 30 is supported on the fixed body 201 and the first abutting portion 202. The sealing member 43 moves from the other side of the cover body 10 through the first abutting portion 202 to between the inner circumferential wall of the mounting hole 11 and the fixed member 20. The lower plastic member 42 is positioned on the other side of the cover body 10.

[0056] As shown in Figures 4, 5 and 7, by flanging and pressing the second abutting portion 203, the second abutting portion 203 presses the sealing ring and the lower plastic 42, completing the sealing and fixation of the cover assembly 100. The assembly of the cover body is simple and quick, and the explosion-proof valve 30 is fixed to the cover body 10 by the fixing member 20, which can ensure that the explosion-proof valve 30 is reliably fixed to the cover body 10, ensuring the safety of battery use.

[0057] According to some embodiments of the present application, as shown in Figures 4 to 6, the wall of the mounting hole 11 is provided with a bending portion 12, which bends and extends toward the outside of the battery and close to the axial direction of the mounting hole 11. The bending portion 12 can prevent the electrolyte from flowing out of the battery through the gap between the wall of the mounting hole 11 and the fixing member 20, and can prevent external liquids from entering the interior of the battery through the gap between the wall of the mounting hole 11 and the fixing member 20, thereby ensuring the sealing of the battery and ensuring the normal use of the battery.

[0058] In addition, as shown in Figures 4 to 6 and 9, a sealing portion 431 is provided on the sealing member 43. The sealing portion 431 cooperates with the bending portion 12 to further ensure the sealing of the cover assembly 100, preventing the electrolyte from flowing out to the outside of the battery through the gap between the bending portion 12 and the fixing member 20, and preventing external liquids from entering the interior of the battery through the gap between the bending portion 12 and the fixing member 20, thereby making the seal more reliable.

[0059] In some embodiments, as shown in Figures 1-3, the cover assembly 100 also includes a fitting 13, which is located on the side of the cover body 10 facing the interior of the battery. When the cover assembly 100 is assembled, the fitting 13 can meet the connection requirements between the cover assembly 100 and other structures, thereby ensuring the safety of battery use.

[0060] In some embodiments, as shown in Figures 1 to 3, the cover plate assembly 100 also includes a pole 50, which is passed through the cover body 10. A rivet block 51 is sleeved on one end of the pole 50 facing the outside of the battery. The rivet block 51 can limit and fix the pole 50 to ensure that the pole 50 is installed reliably and firmly, thereby ensuring normal use of the battery.

[0061] The battery according to the present application includes a cover plate assembly 100 of the battery according to the present application. Since the cover plate assembly 100 according to the embodiment of the present application has the above-mentioned beneficial technical effects, the battery according to the embodiment of the present application, through the fixing member 20 passing through the mounting hole 11 of the cover body 10, the explosion-proof valve 30 is provided in the through hole 21 of the fixing member 20 and blocks the through hole 21, so that the explosion-proof valve 30 can be reliably fixed on the cover body 10, avoiding the problem of unreliable connection caused by welding the explosion-proof valve to the cover body in the related art. In addition, the manufacturing process is simple, and the cover plate assembly 100 is easy to be processed and manufactured, which can ensure the safety of the battery.

[0062] In some embodiments, the battery can be used in a vehicle. The battery of the present application has the characteristics of large capacity and high energy density, and can meet the power supply requirements of the vehicle. For example, the vehicle can be an electric vehicle.

[0063] Other structures and operations of the cap assembly 100 and the battery according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0064] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0065] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cover assembly, wherein: include: A cover body, wherein the cover body is provided with a mounting hole; A fixing member, the fixing member is passed through the mounting hole, and the fixing member is provided with a through hole; An explosion-proof valve is disposed in the through hole and blocks the through hole.

2. The battery cover assembly according to claim 1, wherein: The fixing member comprises: A fixed body, the fixed body is passed through the mounting hole, and the through hole is provided on the fixed body; A first abutment portion and a second abutment portion, the first abutment portion and the second abutment portion are respectively arranged at two ends of the fixed body in the length direction, the first abutment portion is located on the side of the second abutment portion away from the interior of the battery, the first abutment portion and the second abutment portion both extend along the circumferential direction of the fixed body, the first abutment portion and the second abutment portion have one side facing the cover body respectively abut against two sides of the cover body in the thickness direction, and the explosion-proof valve is supported on the fixed body and the first abutment portion.

3. The cover plate assembly of the battery according to claim 2, wherein: A support boss is provided on the side of the first abutment portion away from the interior of the battery, and the support boss is formed into a ring shape extending along the circumferential direction of the fixed body. The explosion-proof valve is located on the inner side of the support boss, and the cover plate assembly also includes a protective member, which is provided on the support boss.

4. The battery cover assembly according to claim 3, wherein: The protective member and the explosion-proof valve are spaced apart in the axial direction of the mounting hole.

5. The cover plate assembly of the battery according to claim 2, wherein: Also includes: The upper plastic is arranged on a side of the cover body facing the outside of the battery, and the upper plastic has an avoidance hole opposite to and connected with the mounting hole. The fixing piece is passed through the avoidance hole, and the first abutting portion abuts against the upper plastic.

6. The cover plate assembly of the battery according to claim 2, wherein: Also includes: The lower plastic is disposed on a side of the cover body facing the inside of the battery, and the lower plastic is disposed around the second abutting portion.

7. The cover plate assembly of a battery according to any one of claims 1 to 6, wherein: A sealing member is provided between the inner peripheral wall of the mounting hole and the fixing member.

8. The battery cover assembly according to claim 7, wherein: The hole wall of the mounting hole is provided with a bending portion, and the bending portion is bent and extended toward the outside of the battery and close to the axial direction of the mounting hole. The sealing member is provided with a sealing portion that cooperates with the bending portion.

9. The cover plate assembly of a battery according to any one of claims 1 to 8, wherein: At least one of the fixing member and the explosion-proof valve is an aluminum member; And / or, the cover body is a steel part or an aluminum part.

10. A battery, wherein: A cover plate assembly comprising a battery according to any one of claims 1 to 9.

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