Battery cover assembly and battery

Abstract

The utility model discloses a battery cover assembly and a battery, and belongs to the technical field of batteries. The battery cover assembly comprises a battery cover body, an elastic clamping piece and an elastic sealing piece, through the combination of the elastic clamping piece and the elastic sealing piece, the sealing of the liquid injection hole is realized, and meanwhile, the detachable design of the elastic clamping piece, the elastic sealing piece and the battery cover body can be realized. Therefore, after the elastic sealing piece and the elastic clamping piece are detached from the liquid injection hole, the air exhausting and liquid supplementing operation can be conveniently carried out according to needs, and after liquid supplementing and air exhausting of the battery are completed, the elastic sealing piece and the elastic clamping piece are operated again, so that the liquid injection hole can be closed and sealed. Therefore, the service life of the battery is prolonged, and the battery meets the development requirements of long endurance and long service life in the industry.

Description

Technical Field

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

[0002] Currently, in the face of many challenges such as resource shortage and environmental pollution, sustainable development has become a global consensus. Under the "dual carbon" strategic goal, new energy will gradually replace traditional environmentally polluting energy. As a carrier for storing electric energy, batteries can be used to store and transport the electric energy produced by power plants, which is of great significance to the development of the new energy industry. Lithium-ion batteries have become the preferred batteries for portable electronic products, electric vehicles, and energy storage due to their advantages such as high capacity density, large specific energy, and long cycle life, and have been more and more widely used. In addition to the advantage of high capacity, batteries should also have good safety and a long cycle life to meet the usage standards and people's needs.

[0003] A battery generally includes: a battery top cover, a housing, and an electric core disposed in the housing. The liquid injection hole is an important structure disposed on the battery top cover for injecting electrolyte into the housing. Currently, the liquid injection hole is usually sealed with a sealing nail, and the sealing nail is disposed in the liquid injection hole and welded and fixed to the battery top cover.

[0004] However, during the use of the battery, problems such as swelling of the housing and consumption of the electrolyte are likely to occur. After welding, the battery top cover cannot perform operations such as exhausting air and replenishing liquid on the battery as needed, resulting in the battery being scrapped or downgraded, which affects the service life of the battery. Utility Model Content

[0005] The embodiments of the present application provide a battery cover assembly and a battery, which can solve the problem that the existing battery cannot be refilled with liquid and exhausted air in time. The technical solutions are as follows:

[0006] On the one hand, a battery cover assembly is provided. The battery cover assembly includes:

[0007] a battery cover body, an elastic clamping member, and an elastic sealing member;

[0008] The battery cover body has a liquid injection hole and an annular clamping groove located on one side of the liquid injection hole;

[0009] The elastic sealing member is located within the area surrounded by the clamping groove and covers the opening on one side of the liquid injection hole;

[0010] The elastic clamping member is located on a side of the elastic sealing member away from the liquid injection hole and abuts against the elastic sealing member. The elastic clamping member includes: a pressing column, and a plurality of connecting portions distributed around an outer side surface of the pressing column. One end of the connecting portion is fixedly connected to the outer side surface of the pressing column, and the other end extends into the clamping groove and is clamped with an inner wall of the clamping groove;

[0011] Wherein, the elastic clamping member is configured to apply a force towards the liquid injection hole to the elastic sealing member through the pressing column, and is clamped with the clamping groove through the connecting portion.

[0012] Optionally, the connecting portion includes: a first connecting arm and a second connecting arm. A first end portion of the first connecting arm is fixedly connected to an edge portion of a top of the pressing column. A second end portion of the first connecting arm is away from the pressing column and close to an edge portion of a bottom of the pressing column relative to the first end portion of the first connecting arm; One end of the second connecting arm is fixedly connected to the second end portion of the first connecting arm;

[0013] Wherein, an extending direction of the second connecting arm is perpendicular to a central axis of the pressing column, and at least a part of the second connecting arm is located in the clamping groove.

[0014] Optionally, the plurality of connecting portions are distributed at equal intervals around the outer side surface of the pressing column.

[0015] Optionally, the battery cover body has a supporting portion. The liquid injection holes are distributed on the supporting portion. The supporting portion has a bearing groove communicating with the liquid injection holes, and an annular protruding portion fixed on a side wall of the bearing groove and disposed opposite to a bottom wall of the bearing groove. A region between the annular protruding portion and the bottom wall of the bearing groove defines the clamping groove.

[0016] Optionally, a side of the supporting portion away from the bearing groove has an auxiliary protruding portion. A central region of the auxiliary protruding portion has an auxiliary liquid injection hole communicating with the liquid injection hole.

[0017] Optionally, a positive projection of the elastic sealing member on a plane where an opening of the liquid injection hole is located covers a region where the opening of the liquid injection hole is located.

[0018] Optionally, the battery cover assembly further includes: a rigid plate member located between the elastic clamping member and the elastic sealing member. Two side surfaces of the rigid plate member abut against the elastic clamping member and the elastic sealing member respectively.

[0019] Optionally, a positive projection of the rigid plate member on a plane where an opening of the liquid injection hole is located covers a region where the opening of the liquid injection hole is located.

[0020] Optionally, the orthographic projection of the rigid plate member on the plane where the opening of the liquid injection hole is located covers the orthographic projection of the elastic seal member on the plane where the opening of the liquid injection hole is located.

[0021] On the other hand, a battery is provided, which includes: a battery cover assembly and a bottom case. The battery cover assembly is fixedly connected to the bottom case, and the battery cover assembly is any one of the battery cover assemblies given above.

[0022] The beneficial effects brought by the technical solutions provided in the embodiments of the present application at least include:

[0023] A battery cover assembly may include: a battery cover body, an elastic clamping member, and an elastic seal member. Through the combination of the elastic clamping member and the elastic seal member, while realizing the sealing of the liquid injection hole, the detachable design of the elastic clamping member and the elastic seal member with the battery cover body can be realized. In this way, after removing the elastic seal member and the elastic clamping member from the liquid injection hole, it is convenient to perform exhaust and liquid replenishment operations as needed. After completing the liquid replenishment and exhaust of the battery, operating the elastic seal member and the elastic clamping member again can close and seal the liquid injection hole. That is, secondary liquid injection can be realized, thereby extending the service life of the battery and meeting the development needs of long endurance and long life in the industry. In addition, an elastic clamping member is used to clamp and connect with the battery cover body at the liquid injection hole to fix the elastic seal member. Compared with the traditional method of sealing the liquid injection hole by welding a sealing aluminum nail, the welding process is omitted and no welding slag is generated. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of a battery cover assembly provided by an embodiment of the present application;

[0026] Figure 2 is Figure 1 The top view of the battery cover assembly shown;

[0027] Figure 3 is Figure 2 The cross-sectional view at A-A';

[0028] Figure 4 It is a schematic structural diagram of an elastic clamping member provided by an embodiment of the present application;

[0029] Figure 5 It is a partial structural schematic diagram of a battery cover body provided by an embodiment of the present application;

[0030] Figure 6 is Figure 5 The front view of the battery cover body shown;

[0031] Figure 7 is the exploded schematic view of a battery cover assembly provided by an embodiment of the present application;

[0032] Figure 8 is Figure 7 The partial structural sectional view of the battery cover assembly shown.

[0033] Through the above-mentioned drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0034] To make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the drawings.

[0035] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 is the structural schematic view of a battery cover assembly provided by an embodiment of the present application, Figure 2 is Figure 1 The top view of the battery cover assembly shown, Figure 3 is Figure 2 The sectional view at A - A'. The battery cover assembly can be hermetically connected to a bottom case (not shown in the figure) loaded with a battery cell group to form a battery. The battery cover assembly can include: a battery cover body 100, an elastic clamping member 200, and an elastic sealing member 300.

[0036] The battery cover body 100 in the battery cover assembly can have a liquid injection hole a1 and an annular clamping groove a2 located on one side of the liquid injection hole a1. Here, the annular clamping groove a2 can be distributed around the liquid injection hole a1, and the liquid injection hole a1 can be used to inject electrolyte into the bottom case of the battery to soak the battery cell group.

[0037] The elastic sealing member 300 in the battery cover assembly can be located within the area surrounded by the annular clamping groove a2 and can cover the opening a11 on one side of the liquid injection hole a1. Exemplarily, the elastic sealing member 300 can be a sheet-like structure made of fluororubber.

[0038] The elastic clamping member 200 in the battery cover assembly can be located on one side of the elastic seal 300 away from the liquid injection hole a1 of the battery cover body 100 and abuts against the elastic seal 300. The elastic clamping member 200 can include: a pressing column 201, and a plurality of connecting portions 202 distributed around the outer side surface of the pressing column 201. One end of each connecting portion 202 can be fixedly connected to the outer side surface of the pressing column 201, and the other end of each connecting portion 202 can extend into the clamping groove a2 of the battery cover body 100 and abut against the inner wall of the clamping groove a2. Here, the elastic clamping member 200 abuts against the side of the elastic seal 300 away from the liquid injection hole a1.

[0039] Among them, the elastic clamping member 200 can be used to apply a force towards the liquid injection hole a1 to the elastic seal 300 through the pressing column 201, and can be clamped with the annular clamping groove a2 in the battery cover body 100 through the connecting portion 202.

[0040] For example, by arranging the elastic seal 300 and the elastic clamping member 200 in the battery cover assembly, after covering the elastic seal 300 at the opening a11 of the liquid injection hole a1, an operator can apply an external force to deform the connecting portion 202 in the elastic clamping member 200, and at the same time apply a downward pressure to the elastic seal 300 through the pressing column 201, so that the elastic seal 300 can be deformed to be in close contact with the opening a11 of the liquid injection hole a1 to ensure the sealing performance of the liquid injection hole a1. After placing the deformed connecting portion 202 into the annular clamping groove a2 in the battery cover body 100, the connecting portion 202 recovers a certain degree of deformation and abuts against the inner wall of the clamping groove a2 to achieve clamping with the battery cover body 100.

[0041] In the embodiment of the present application, through the combination of the elastic clamping member 200 and the elastic seal 300, while realizing the sealing of the liquid injection hole a1, the detachable design of the elastic clamping member 200 and the elastic seal 300 with the battery cover body 100 can be realized. In this way, after disassembling the elastic seal 300 and the elastic clamping member 200 from the liquid injection hole a1, it is convenient to perform exhaust and liquid filling operations as needed. After completing the liquid filling and exhaust of the battery, operating the elastic seal 300 and the elastic clamping member 200 again can close and seal the liquid injection hole a1. That is, secondary liquid injection can be realized, thereby prolonging the service life of the battery and meeting the development requirements of long endurance and long life in the industry. In addition, using the elastic clamping member 200 to be clamped with the battery cover body 100 at the liquid injection hole a1 to fix the elastic seal 300, compared with the traditional method of sealing the liquid injection hole a1 by welding a sealing aluminum nail, the welding process is omitted and no welding slag is generated.

[0042] In summary, the embodiment of the present application provides a battery cover assembly, which may include: a battery cover body, an elastic retaining member and an elastic sealing member. Through the combination of the elastic retaining member and the elastic sealing member, while achieving the sealing of the injection hole, the elastic retaining member and the elastic sealing member can be detachably designed with the battery cover body. In this way, after removing the elastic seal and the elastic retaining member from the injection hole, it is convenient to perform exhaust and refilling operations as needed. After completing the refilling and exhausting of the battery, the elastic seal and the elastic retaining member are operated again to close and seal the injection hole. That is, secondary injection can be achieved, thereby extending the service life of the battery and meeting the development needs of long-range and long-life batteries in the industry. In addition, the elastic retaining member is used to clamp with the battery cover body at the injection hole to fix the elastic seal. Compared with the traditional method of welding the sealing aluminum nail to seal the injection hole, the welding process is omitted and no welding slag is generated.

[0043] Optional, please refer to Figure 4 , Figure 4 : is a schematic diagram of the structure of an elastic retaining member provided in an embodiment of the present application. The connecting portion 202 in the elastic retaining member 200 may include: a first connecting arm 202a and a second connecting arm 202b, wherein the first end of the first connecting arm 202a may be fixedly connected to the edge portion of the top of the clamping column 201, and the second end of the first connecting arm 202a is away from the clamping column 201 and close to the edge portion of the bottom of the clamping column 201 relative to the first end of the first connecting arm 202a. One end of the second connecting arm 202b may be fixedly connected to the second end of the first connecting arm 202a. The extending direction of the second connecting arm 202b may be perpendicular to the central axis of the clamping column 201, and at least a portion of the second connecting arm 202b may be located in the retaining groove a2 of the battery cover body 100. For example, the first connecting arm 202a will deform (not a large deformation) under the action of external force, and will return to its original shape when the external force disappears. The second connecting arm 202b is connected to the first connecting arm 202a. After the first connecting arm 202a is deformed and restored to its original shape, the second connecting arm 202b is flush with the bottom edge of the pressing column 201. In this way, the two connecting arms can be conveniently connected to the battery cover body 100 through cooperation, and the elastic seal 300 can be pressed together with the pressing column 201.

[0044] Here, the top of the compression column 201 is the end of the compression column 201 away from the elastic seal 300 , and the bottom of the compression column 201 is the end of the compression column 201 close to the elastic seal 300 and abutting against the elastic seal 300 .

[0045] It should be noted that the elastic clamping member 200 can be a structure made of polypropylene (abbreviation: PP in English). Both the first connecting arm 202a and the second connecting arm 202b in the connecting portion 202 can be elastic arms, and the included angle between the extending direction of the second connecting arm 202b and the extending direction of the first connecting arm 202a can be an obtuse angle. And in order to ensure the abutting effect between the connecting portion 20 and the annular clamping groove a2, the depth of the clamping groove a2 can be less than or equal to the sum of the thicknesses of the second connecting arm 202b and the elastic seal 300 before deformation.

[0046] In the embodiment of the present application, as Figure 4 shown, multiple connecting portions 202 in the elastic clamping member 200 can be evenly distributed around the outer side surface of the pressing column 201 at equal intervals. In this way, it can be ensured that the force on the elastic clamping member 200 is relatively uniform, and the pressing effect on the elastic seal 300 is also better. For example, the number of the elastic clamping members 200 in the battery cover assembly can be three, four, five, etc., and the embodiment of the present application does not make specific limitations on this.

[0047] Optionally, please refer to Figure 3 、 Figure 5 and Figure 6 , Figure 5 which is a partial structural schematic diagram of a battery cover body provided by the embodiment of the present application, Figure 6 is Figure 5 the front view of the battery cover body shown. The battery cover body 100 can have a support portion 101, and the liquid injection holes a1 of the battery cover body 100 can be distributed on the support portion 101. The support portion 101 can have a bearing groove 101a communicating with the liquid injection hole a1, and an annular protrusion 101b fixed on the side wall of the bearing groove 101a and disposed opposite to the bottom wall of the bearing groove 101a. Among them, the area between the annular protrusion 101b and the bottom wall of the bearing groove 101a can form an annular clamping groove a2 in the battery cover body 100. In this way, by providing a communicating bearing groove 101a and a liquid injection hole a1 on the support portion 101 of the battery cover body 100, and providing an annular protrusion 101b on the side wall of the bearing groove 101a, thus, an annular clamping groove a2 for the elastic clamping member 200 to be clamped on the battery cover body 100 can be formed, and the effective sealing of the liquid injection hole a1 can be achieved while ensuring the simple processing technology of the battery cover body 100.

[0048] In the embodiment of the present application, as Figure 5 and Figure 6As shown, on the side of the support portion 101 of the battery cover body 100 facing away from the bearing groove 101a, there may be an auxiliary protrusion portion 101c, and a central region of the auxiliary protrusion portion 101c has an auxiliary liquid injection hole b1 communicating with the liquid injection hole a1. In this case, by providing the auxiliary protrusion portion 101c on the side of the support portion 101 facing away from the bearing groove 101a, that is, at the bottom of the support portion 101, the auxiliary protrusion portion 101c can effectively strengthen the structural strength of the support portion 101, ensuring that even when the liquid injection hole a1 is opened at the support portion 101 of the battery cover body 100, the battery cover body 100 has a relatively high safety factor.

[0049] Optionally, the orthographic projection of the elastic seal 300 in the battery cover assembly on the plane where the opening a11 of the liquid injection hole a1 is located may cover the area where the opening a11 of the liquid injection hole a1 is located. In this case, by setting the orthographic projection of the elastic seal 300 on the plane where the opening a11 of the liquid injection hole a1 is located to cover the area where the opening a11 of the liquid injection hole a1 is located, in this way, it can effectively ensure that the elastic seal 300 has a good sealing effect on the opening a11 of the liquid injection hole a1.

[0050] In the embodiments of the present application, please refer to Figure 7 and Figure 8 , Figure 7 is an exploded view of a battery cover assembly provided by an embodiment of the present application, Figure 8 is Figure 7 a partial structural cross-sectional view of the battery cover assembly shown. The battery cover assembly may further include: a rigid plate member 400 located between the elastic clamping member 200 and the elastic seal 300, and two side surfaces of the rigid plate member 400 may be respectively in contact with the elastic clamping member 200 and the elastic seal 300. In this case, by providing the rigid plate member 400 between the elastic clamping member 200 and the elastic seal 300, in this way, after the elastic clamping member 200 applies a certain pressure to the rigid plate member 400, the rigid plate member 400 can provide a relatively uniform pressure to the elastic seal 300, ensuring that the deformation of the force-bearing area of the elastic seal 300 is basically the same, and further ensuring that the elastic seal 300 has a good sealing effect on the liquid injection hole a1. It should be noted that in order to ensure the contact effect between the connecting portion 202 and the annular clamping groove a2, the depth of the clamping groove a2 may be less than or equal to the sum of the thicknesses of the second connecting arm 202b and the elastic seal 300 before deformation and the thickness of the rigid plate member 400. By way of example, the rigid plate member 400 may be a sheet-like structure made of materials such as hard plastic or hard alloy.

[0051] By way of example, as Figure 8 shown, the orthographic projection of the rigid plate member 400 in the battery cover assembly on the plane where the opening a11 of the liquid injection hole a1 is located may cover the area where the opening a11 of the liquid injection hole a1 is located.

[0052] Optional, such as Figure 8 As shown, the orthographic projection of the hard plate 400 in the battery cover assembly on the plane where the opening a11 of the injection hole a1 is located can cover the orthographic projection of the elastic seal 300 on the plane where the opening a11 of the injection hole a1 is located. In this way, the elastic seal 300 is covered by the hard plate 400, so that the hard plate 400 can generate a certain pressure on each position of the elastic seal 300, so that each position of the elastic seal 300 is deformed to be tightly attached to the portion of the battery cover body 100 where the injection hole a1 is set, meeting the sealing requirements of the injection hole a1.

[0053] In the embodiments of the present application, Figure 7 As shown, the battery cover assembly may also include: a negative pole 500, a positive pole 600 and an explosion-proof valve 700. The positive pole 600 and the negative pole 500 are respectively connected to the positive pole ear and the negative pole ear on the battery cell in the battery, so that the battery cell supplies power to external electrical equipment through the positive and negative pole ears. The explosion-proof valve 700 includes an explosion-proof plate and a protective film (not shown in the figure), and an explosion-proof hole is opened on the battery cover body 100, and the explosion-proof plate is connected to the inner wall of the explosion-proof hole, and the explosion-proof plate is provided with a notch. When the battery generates a large amount of heat and a large amount of gas during the cycle, the gas breaks through the notch on the explosion-proof plate and is discharged from the bottom shell of the battery to avoid battery explosion and realize the top explosion-proof of the battery. The protective film is connected to the explosion-proof hole and is located on the outside of the explosion-proof plate, which can protect the explosion-proof plate and prevent the explosion-proof plate from being bumped, broken and invalidated during transportation of the battery. At the same time, it is prevented that the electrolyte overflows onto the explosion-proof plate during injection and corrodes it, causing it to fail.

[0054] In summary, the embodiment of the present application provides a battery cover assembly, which may include: a battery cover body, an elastic retaining member and an elastic sealing member. Through the combination of the elastic retaining member and the elastic sealing member, while achieving the sealing of the injection hole, the elastic retaining member and the elastic sealing member can be detachably designed with the battery cover body. In this way, after removing the elastic seal and the elastic retaining member from the injection hole, it is convenient to perform exhaust and refilling operations as needed. After completing the refilling and exhausting of the battery, the elastic seal and the elastic retaining member are operated again to close and seal the injection hole. That is, secondary injection can be achieved, thereby extending the service life of the battery and meeting the development needs of long-range and long-life batteries in the industry. In addition, the elastic retaining member is used to clamp with the battery cover body at the injection hole to fix the elastic seal. Compared with the traditional method of welding the sealing aluminum nail to seal the injection hole, the welding process is omitted and no welding slag is generated.

[0055] An embodiment of the present application further provides a battery, which may include: a battery cover assembly and a bottom case (not shown in the figure). The battery cover assembly may be fixedly connected to the bottom case, and the battery cover assembly may be any of the battery cover assemblies given above. In this way, the battery integrated with the above battery cover assembly can achieve secondary liquid injection, thereby extending the service life of the battery and meeting the development requirements of long endurance and long life in the industry. In addition, an elastic clamping member is used to clamp the battery cover body at the liquid injection hole to fix the elastic seal member. Compared with the traditional method of sealing the liquid injection hole by welding a sealing aluminum nail, the welding process is omitted and no welding slag is generated.

[0056] It should be noted that in the drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. Also, it can be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be an intermediate layer. Additionally, it can be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element, or there may be more than one intermediate layer or element. Further, it can also be understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Like reference numerals throughout the specification indicate like elements.

[0057] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

[0058] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cover assembly, characterized in that, include: A battery cover body, an elastic retaining member and an elastic sealing member; The battery cover body has a liquid injection hole and an annular locking groove located on one side of the liquid injection hole; The elastic sealing member is located in the area surrounded by the locking groove, and covers the opening on one side of the liquid injection hole; The elastic clamping member is located on a side of the elastic sealing member away from the injection hole and abuts against the elastic sealing member, and the elastic clamping member includes: a clamping column, and a plurality of connecting parts distributed around the outer side surface of the clamping column, one end of the connecting part is fixedly connected to the outer side surface of the clamping column, and the other end extends into the clamping groove and clamps with the inner wall of the clamping groove; Wherein, the elastic locking member is used to apply a force toward the injection hole to the elastic sealing member through the clamping column, and is locked with the locking groove through the connecting portion.

2. The battery cover assembly according to claim 1, characterized in that, The connecting portion comprises: a first connecting arm and a second connecting arm, wherein the first end of the first connecting arm is fixedly connected to the edge portion of the top of the pressing column, and the second end of the first connecting arm is away from the pressing column and close to the edge portion of the bottom of the pressing column relative to the first end of the first connecting arm; one end of the second connecting arm is fixedly connected to the second end of the first connecting arm; Wherein, the extension direction of the second connecting arm is perpendicular to the central axis of the pressing column, and at least a portion of the second connecting arm is located in the locking groove.

3. The battery cover assembly according to claim 1, characterized in that, The multiple connection parts are distributed around the outer side surface of the compression column at equal intervals.

4. The battery cover assembly according to claim 1, wherein, The battery cover body has a supporting portion, the injection holes are distributed on the supporting portion, the supporting portion has a supporting groove connected to the injection hole, and an annular protrusion fixed on the side wall of the supporting groove and arranged opposite to the bottom wall of the supporting groove, and the area between the annular protrusion and the bottom wall of the supporting groove forms the locking groove.

5. The battery cover assembly according to claim 4, wherein, The supporting portion has an auxiliary protrusion on one side away from the bearing groove, and the central area of the auxiliary protrusion has an auxiliary liquid injection hole connected with the liquid injection hole.

6. The battery cover assembly according to claim 1, characterized in that, The orthographic projection of the elastic sealing member on the plane where the opening of the liquid injection hole is located covers the area where the opening of the liquid injection hole is located.

7. The battery cover assembly according to any one of claims 1-6, characterized in that, The battery cover assembly further includes: a hard plate member located between the elastic retaining member and the elastic sealing member, and two side surfaces of the hard plate member are respectively in contact with the elastic retaining member and the elastic sealing member.

8. The battery cover assembly according to claim 7, characterized in that, The orthographic projection of the hard plate on the plane where the opening of the injection hole is located covers the area where the opening of the injection hole is located.

9. The battery cover assembly according to claim 8, characterized in that, The orthographic projection of the hard plate on the plane where the opening of the injection hole is located covers the orthographic projection of the elastic sealing component on the plane where the opening of the injection hole is located.

10. A battery, characterized in that, include: A battery cover assembly and a bottom shell, wherein the battery cover assembly is fixedly connected to the bottom shell, and the battery cover assembly is the battery cover assembly described in any one of claims 1 to 9.

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