Battery cover assembly, battery, battery pack and electric equipment

Abstract

The utility model provides a battery cover assembly, a battery, a battery pack and electric equipment, and relates to the technical field of batteries, the battery cover assembly comprises a cover body, a connecting body and a cover body, and the cover body is provided with a liquid injection hole. The connecting body is arranged on the cover body and surrounds the periphery of the liquid injection hole, and a through hole communicated with the liquid injection hole is formed in the connecting body. And the cover body covers the connecting body so as to seal the liquid injection hole. Wherein the peripheral side of the cover body is welded with the connecting body to form a welding part, and the welding part penetrates through the connecting body and extends into the cover body. According to the battery cover assembly disclosed by the embodiment of the invention, the cover body is indirectly welded on the cover body through the connecting body, and the connecting body plays a role in transition connection, so that the probability of generating defects such as welding holes, needle holes and cracks at the welding part can be greatly reduced, and the yield of products is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover assembly, a battery, a battery pack, and an electrical device. Background Art

[0002] Batteries can provide power for electrical equipment, such as the power batteries used in new energy vehicles.

[0003] Batteries typically consist of a cell, a casing, and a cover. The casing has a cavity within which the cell is placed, and the cover is placed over the casing to seal the cell. In related art, the cover typically has an injection hole to allow for the injection of electrolyte into the casing. After injection, a sealing pin is inserted into the injection hole and a sealing cover is welded to seal the hole.

[0004] However, the existing sealing cover is directly welded to the cover body, and defects such as weld holes, pinholes, and cracks are easily generated at the welding points, thereby affecting the quality and yield of battery production. Utility Model Content

[0005] Based on this, the present application provides a battery cover assembly, battery, battery pack and electrical equipment to solve the problem that when the existing battery filling hole is welded and sealed, defects such as weld holes, pinholes, and cracks are easily generated at the welding point, thereby affecting the battery production quality and yield.

[0006] In a first aspect, the present application provides a battery cover assembly, comprising:

[0007] A cover body, wherein the cover body is provided with a liquid injection hole;

[0008] A connector, which is disposed on the cover body and surrounds the liquid injection hole, and has a through hole communicating with the liquid injection hole;

[0009] A cover body is provided on the connecting body to close the liquid injection hole;

[0010] The peripheral side of the cover body is welded to the connecting body to form a welding portion, and the welding portion penetrates the connecting body and extends into the cover body.

[0011] In a possible implementation, the cover body is an aluminum alloy part, and the connector and the cover body are both aluminum parts.

[0012] In a possible implementation, the cover body includes a sealing portion and a first flange portion connected to a periphery of the sealing portion and turned outward, and a peripheral side of the first flange portion is welded to the connector.

[0013] In a possible implementation, the sealing portion has an opening on a side facing the connector, and the opening is communicated with the liquid injection hole.

[0014] In a possible implementation, the connecting body has a first annular groove for accommodating the first flanging portion, and the first flanging portion is inserted into the first annular groove.

[0015] In a possible implementation manner, the side wall of the first annular groove is inclined toward the side away from the first flange portion.

[0016] In a possible implementation, the connector includes a connecting portion, and the cover body has a second annular groove for accommodating the connecting portion;

[0017] At least a portion of the connecting portion is inserted into the second annular groove, and the first annular groove is located on a side of the connecting portion away from the second annular groove.

[0018] In a possible implementation manner, a side wall of the second annular groove is inclined toward a side away from the connecting portion.

[0019] In a possible implementation, the connector further includes a second flange portion that is arranged on the periphery of the connector and turned outward, the cover body has a third annular groove for accommodating the second flange portion, and the second flange portion is inserted into the third annular groove.

[0020] In a possible implementation, a blocking piece is further included, and the blocking piece is inserted into the liquid injection hole and the through hole.

[0021] In a second aspect, the present application further provides a battery, comprising a battery cell, a shell, and any one of the cover assemblies provided in the first aspect, wherein the battery cell is disposed in the shell, and the cover body in the battery cover assembly is disposed on the shell.

[0022] In a third aspect, the present application further provides a battery pack, comprising a battery pack body and at least one battery provided in any one of the second aspects, arranged on the battery pack body.

[0023] In a fourth aspect, the present application further provides an electrical device, comprising a device body, on which the battery provided in the second aspect is disposed;

[0024] Alternatively, the device body is provided with the battery pack provided in the third aspect.

[0025] The present application provides a battery cover assembly, a battery, a battery pack and an electrical device. The battery cover assembly includes a cover body, a connector and a cover body. An injection hole is provided on the cover body so that electrolyte can be subsequently injected into the battery. The connector is provided on the cover body and around the side of the injection hole, and a through hole communicating with the injection hole is provided on the connector. The cover body is then placed on the connector to close the injection hole and prevent the electrolyte from flowing out. Among them, a welding portion is formed by welding the peripheral side of the cover body to the connector, and the welding portion penetrates the connector and extends into the cover body, that is, the cover body is indirectly welded to the cover body through the connector. The connector plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, cracks, etc. in the welding portion, thereby improving the yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 A schematic structural diagram of a battery cover assembly provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 Cross-sectional view along section AA;

[0029] Figure 3 for Figure 2 A partial enlarged view of point B in the middle.

[0030] Reference numerals:

[0031] 100: cover;

[0032] 110: injection hole;

[0033] 120: second ring groove;

[0034] 130: third ring groove;

[0035] 200: connector;

[0036] 201: connecting part;

[0037] 202: second flanging portion;

[0038] 210: through hole;

[0039] 220: first ring groove;

[0040] 300: mask body;

[0041] 310: Sealing part;

[0042] 311: Open mouth;

[0043] 320: first flanging portion;

[0044] 400: Sealing piece. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of methods and apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

[0046] The terms "first," "second," "third," "fourth," etc. (if any) in the specification and claims of the present application and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or apparatus.

[0047] Currently, after lithium batteries are filled, a sealing nail is inserted into the filling hole, and the sealing mask is directly connected to the cover body via laser welding. However, the cover body is generally made of a 3-series aluminum-magnesium-manganese alloy. The magnesium element easily forms a brittle phase with other elements during the welding process, and the large shrinkage stress generated by post-weld cooling can easily cause cracks. Moreover, the gas inside the weld expands due to heat. When the gas pressure exceeds the surface tension of the molten pool, it will break through the molten pool and escape, which can easily cause defects such as weld holes and pinholes in the weld, affecting the yield rate of battery production.

[0048] In response to the above-mentioned problems existing in the prior art, the present application provides a battery cover assembly, a battery, a battery pack and an electrical device. The battery cover assembly provided in the present application includes a cover body, a connector and a cover body, and an injection hole is provided on the cover body so that electrolyte can be subsequently injected into the battery. The connector is provided on the cover body and wrapped around the side of the injection hole, and a through hole communicating with the injection hole is provided on the connector. The cover body is then covered on the connector to close the injection hole and prevent the electrolyte from flowing out. Among them, a welding portion is formed by welding the peripheral side of the cover body to the connector, and the welding portion penetrates the connector and extends into the cover body, that is, the cover body is indirectly welded to the cover body through the connector, and the connector plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, cracks, etc. in the welding portion, thereby improving the yield of the product.

[0049] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0050] First, refer to Figure 1-Figure 3 As shown, an embodiment of the present application provides a battery cover assembly, including a cover body 100 , a connector 200 and a cover body 300 , and a liquid injection hole 110 is provided on the cover body 100 .

[0051] The connecting body 200 is disposed on the cover 100 and surrounds the periphery of the liquid injection hole 110 . The connecting body 200 has a through hole 210 communicating with the liquid injection hole 110 .

[0052] The cover body 300 is covered on the connecting body 200 to close the liquid injection hole 110 .

[0053] The peripheral side of the cover body 300 is welded to the connecting body 200 to form a welding portion, and the welding portion penetrates the connecting body 200 and extends into the cover body 100 .

[0054] The cover 100 in this embodiment, also known as the battery cover or top cover, can be a thin, rectangular or cylindrical structure, specifically matching the shape of the mounting opening on the housing. A liquid injection hole 110 is provided on the cover 100 to connect the interior of the housing with the outside world. The specific shape, size, and location of the liquid injection hole 110 can be determined based on actual needs.

[0055] The connector 200 in this embodiment is used to serve as a transition connection. It can be a plate-shaped, block-shaped structure. The connector 200 surrounds the circumference of the liquid injection hole 110, and one side surface of the connector 200 can be connected to the cover body 100 by pressing. A through hole 210 is left on the connector 200, and the through hole 210 is aligned with the liquid injection hole 110, that is, it cannot block the liquid injection hole 110.

[0056] The cover body 300 in this embodiment is used to seal the injection hole 110 and the through hole 210. It can be a plate-shaped, shell-shaped, block-shaped structure. The cover body 300 is covered on the other side surface of the connector 200 to seal the injection hole 110 and the through hole 210 to prevent the electrolyte from flowing out.

[0057] Specifically, if Figure 2 As shown, the peripheral side of the cover body 300 is welded to the connecting body 200 to form a welding portion, as shown in FIG. Figure 3 As shown at D in FIG. 1 , the cross section of the weld portion is roughly an inverted triangle, but the shape of the cross section varies with the change of welding parameters. The weld portion penetrates the connector 200 and extends into the cover 100. The depth of the extension is as shown in FIG. Figure 3 As shown in H1, sealing is performed. The depth H1 changes with the change of welding parameters.

[0058] It should be noted that the cover 100 may also be provided with components such as poles and explosion-proof valves, which can be determined according to actual needs.

[0059] It can be understood that, compared with the operation of directly welding the cover body 300 to the cover body 100, in the application of the battery cover assembly in this embodiment, the cover body 300 is indirectly welded to the cover body 100 through the connector 200. The connector 200 plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, and cracks in the welding part, thereby improving the yield of the product.

[0060] Thus, the battery cover assembly provided in the embodiment of the present application includes a cover body 100, a connector 200 and a cover body 300. The cover body 100 is provided with an injection hole 110 so that the electrolyte can be subsequently injected into the battery. By arranging the connector 200 on the cover body 100 and surrounding the injection hole 110, the connector 200 has a through hole 210 that communicates with the injection hole 110. The cover body 300 is then covered on the connector 200 to close the injection hole 110 and prevent the electrolyte from flowing out. Among them, by welding the peripheral side of the cover body 300 to the connector 200 to form a welding portion, the welding portion penetrates the connector 200 and extends into the cover body 100, that is, the cover body 300 is indirectly welded to the cover body 100 through the connector 200. The connector 200 plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, cracks, etc. in the welding portion, thereby improving the yield of the product.

[0061] In some embodiments, the cover body 100 is an aluminum alloy piece, and the connector 200 and the cover body 300 are both aluminum pieces.

[0062] Specifically, the cover body 100 can be made of a 3-series aluminum-magnesium-manganese alloy, which has high strength and hardness and good corrosion resistance. The connector 200 and the cover body 300 are both made of 1-series pure aluminum. In this way, the connector 200 and the cover body 300 are made of the same material, the welding melting point requirement is low, the internal gas expansion pressure due to heat is low, and there is no doping of other elements during the welding process. The probability of brittle phases is reduced, the weld morphology and stress contraction are more uniform, and the molten pool has good fluidity. When the welding portion extends into the cover body 100, as it combines with the 3-series aluminum-magnesium-manganese alloy, due to its low melting point, fewer bubbles are generated and it is easy to pass through the molten pool, thereby greatly reducing the risk of weld holes, pinholes, and cracks.

[0063] In some embodiments, the cover body 300 includes a sealing portion 310 and a first flange portion 320 connected to the periphery of the sealing portion 310 and turned outward, and the peripheral side of the first flange portion 320 is welded to the connector 200 .

[0064] Specifically, if Figure 2As shown, the sealing portion 310 protrudes toward the side away from the connector 200, and the first flange portion 320 is integrally formed with the peripheral side of the sealing portion 310. By welding the first flange portion 320 to the connector 200, the contact surface is relatively large, thereby ensuring the stability of the connection.

[0065] The thickness of the first flange portion 320 may be 0.3 mm to 1.0 mm. The specific thickness, outer diameter and other parameters of the first flange portion 320 may be determined according to actual needs and are not specifically limited in this embodiment.

[0066] Furthermore, in this embodiment, the sealing portion 310 has an opening 311 on a side facing the connector 200 , and the opening 311 is communicated with the liquid injection hole 110 .

[0067] Specifically, continue as Figure 2 As shown, the opening cavity 311 is a part of the accommodating cavity on the sealing portion 310. During the welding process, the opening cavity 311 can accommodate a part of the gas expanded by heat at the welding portion, reducing the pressure at the molten pool, thereby further reducing the risk of generating weld holes and pinholes.

[0068] In addition, the internal space of the opening cavity 311 can also meet the installation requirements of the sealing nail. The specific size of the opening cavity 311 can be determined according to actual needs and is not specifically limited in this embodiment.

[0069] Furthermore, in this embodiment, the connecting body 200 has a first annular groove 220 for accommodating the first flange portion 320 , and the first flange portion 320 is inserted into the first annular groove 220 .

[0070] Specifically, if Figure 2 As shown, the first annular groove 220 is a first sunken groove that matches the first flange portion 320. The depth of the first annular groove 220 can be 0.3mm to 1.0mm. The first flange portion 320 is inserted into the first annular groove 220, which not only serves to position the first flange portion 320 but also ensures the stability of the connection.

[0071] The size, depth and other parameters of the first annular groove 220 are determined according to the first flange portion 320 , and are not specifically limited in this embodiment.

[0072] Furthermore, in this embodiment, the side wall of the first annular groove 220 is inclined toward the side away from the first flange portion 320 .

[0073] That is, combined Figure 2 、 Figure 3As shown, the cross-section of the first annular groove 220 is generally in the shape of an inverted cone. This makes it easy to accurately insert the first flange portion 320 into the first annular groove 220, facilitating installation and providing good positioning. The inclination of the sidewall of the first annular groove 220 can be determined based on actual needs and is not specifically limited in this embodiment.

[0074] In some embodiments, the connector 200 includes a connecting portion 201 , and the cover 100 has a second annular groove 120 for accommodating the connecting portion 201 .

[0075] At least a portion of the connecting portion 201 is inserted into the second annular groove 120 , and the first annular groove 220 is located on a side of the connecting portion 201 away from the second annular groove 120 .

[0076] Specifically, if Figure 2 As shown, the connecting portion 201 protrudes toward the side away from the cover body 300, and the side of the cover body 100 facing the connecting body 200 has a second annular groove 120 that matches part of the connecting portion 201. The second annular groove 120 is a second recessed groove on the cover body 100. The part of the connecting portion 201 is inserted into the second annular groove 120 to facilitate the installation and positioning of the connecting body 200.

[0077] In addition, the first annular groove 220 is located on the side of the connecting portion 201 away from the second annular groove 120, ensuring that the welding part is located on the connecting portion 201. The specific size, depth and other parameters of the second annular groove 120 can be determined according to the connecting portion 201 and are not specifically limited in this embodiment.

[0078] Furthermore, in this embodiment, the sidewall of the second annular groove 120 is inclined toward the side away from the connecting portion 201 .

[0079] That is, combined Figure 2 、 Figure 3 As shown, the cross-section of the second annular groove 120 is generally inverted conical, which makes it easy to accurately insert the connecting portion 201 into the second annular groove 120, facilitates installation, and has good positioning. Among them, the inclination of the side wall of the second annular groove 120 can be determined according to actual needs and is not specifically limited in this embodiment.

[0080] Furthermore, in this embodiment, the connecting body 200 also includes a second flange portion 202 arranged on the periphery of the connecting portion 201 and turned outward, and the cover body 100 has a third annular groove 130 for accommodating the second flange portion 202, and the second flange portion 202 is inserted into the third annular groove 130.

[0081] Specifically, if Figure 2As shown, the connecting portion 201 and the second flange portion 202 can be integrally formed. The cover 100 has a third annular groove 130 on the side facing the housing 300 that matches the second flange portion 202. The third annular groove 130 is a third sunken groove with a depth of 0.3mm to 1.0mm. Inserting the second flange portion 202 into the third annular groove 130 not only helps position the second flange portion 202, but also ensures the stability of the connection. When the connector 200 is pressed against the cover 100 with a high pressure, the second flange portion 202 forms an interference fit with the third annular groove 130, increasing the bonding strength.

[0082] The specific shape, size, etc. of the second flange portion 202 and the third annular groove 130 can be determined according to actual needs and are not specifically limited in this embodiment.

[0083] Optionally, in this embodiment, a blocking member 400 is further included, and the blocking member 400 is inserted into the liquid injection hole 110 and the through hole 210 .

[0084] Specifically, if Figure 2 As shown, the sealing member 400 can be a sealing nail, a liquid filling cap, etc., made of rubber. When the electrolyte filling is completed, the sealing member 400 is sealed in the liquid filling hole 110 and the through hole 210 to ensure sealing. The size, type, etc. of the sealing member 400 can be determined according to the liquid filling hole 110 and the through hole 210, and are not specifically limited in this embodiment.

[0085] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell, a shell, and a battery cover assembly provided in any of the above embodiments, wherein the battery cell is disposed in the shell, and the cover body 100 in the battery cover assembly is disposed on the shell.

[0086] The structure of the battery cover assembly has been described in detail in the above embodiments and will not be described again here.

[0087] Specifically, the housing has a cavity for accommodating components such as the battery cell. A mounting opening is provided on one side of the housing, communicating with the cavity. The battery cell is loaded into the cavity through the mounting opening, and then covered with a cover 100, which is then welded and sealed, completing the assembly of the battery cell.

[0088] It is understood that the battery provided in the embodiment of the present application, by configuring a battery cover assembly, includes a cover body 100, a connector 200 and a cover body 300, and is provided with an injection hole 110 on the cover body 100 so that electrolyte can be subsequently injected into the battery. By setting the connector 200 on the cover body 100 and surrounding the side of the injection hole 110, the connector 200 has a through hole 210 that communicates with the injection hole 110. The cover body 300 is then covered on the connector 200 to close the injection hole 110 and prevent the electrolyte from flowing out. Among them, by welding the peripheral side of the cover body 300 to the connector 200 to form a welding portion, the welding portion penetrates the connector 200 and extends into the cover body 100, that is, the cover body 300 is indirectly welded to the cover body 100 through the connector 200, and the connector 200 plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, and cracks in the welding portion, thereby improving the product yield.

[0089] In a third aspect, an embodiment of the present application further provides a battery pack, comprising a battery pack body and at least one battery provided by any of the above embodiments arranged on the battery pack body.

[0090] For example, a battery pack body may be provided with several of the above-mentioned batteries, arranged side by side. Of course, the battery pack body may also include a thermal management module, a controller, etc. to ensure the normal operation of the battery, and its specific components may be determined according to actual needs.

[0091] It is understood that the battery pack provided in the embodiment of the present application is configured with a battery, which includes a battery cover assembly, which includes a cover body 100, a connector 200 and a cover body 300. The cover body 100 is provided with an injection hole 110 to facilitate the subsequent injection of electrolyte into the battery. By setting the connector 200 on the cover body 100 and surrounding the injection hole 110, the connector 200 has a through hole 210 that communicates with the injection hole 110. The cover body 300 is then covered on the connector 200 to close the injection hole 110 and prevent the electrolyte from flowing out. Among them, a welding portion is formed by welding the peripheral side of the cover body 300 to the connector 200, and the welding portion penetrates the connector 200 and extends into the cover body 100, that is, the cover body 300 is indirectly welded to the cover body 100 through the connector 200, and the connector 200 plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, and cracks in the welding portion, thereby improving the yield of the product.

[0092] Fourthly, embodiments of the present application further provide an electrical device, including a device body, on which is disposed a battery or battery pack provided by any of the above embodiments. The electrical device may include new energy vehicles, energy storage devices, and the like.

[0093] It is understood that the vehicle provided in the embodiment of the present application is configured with the above-mentioned battery or a battery pack having the battery, and the battery includes a cover assembly, which includes a cover body 100, a connector 200 and a cover body 300. The cover body 100 is provided with an injection hole 110 to facilitate the subsequent injection of electrolyte into the battery. By setting the connector 200 on the cover body 100 and surrounding the injection hole 110, the connector 200 has a through hole 210 that communicates with the injection hole 110. The cover body 300 is then covered on the connector 200 to close the injection hole 110 and prevent the electrolyte from flowing out. Among them, a welding portion is formed by welding the peripheral side of the cover body 300 to the connector 200, and the welding portion penetrates the connector 200 and extends into the cover body 100, that is, the cover body 300 is indirectly welded to the cover body 100 through the connector 200, and the connector 200 plays a transition connection role, which can greatly reduce the probability of defects such as weld holes, pinholes, and cracks in the welding portion, thereby improving the yield of the product.

[0094] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0095] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: A cover body (100), wherein the cover body (100) is provided with a liquid injection hole (110); A connecting body (200), the connecting body (200) being arranged on the cover body (100) and surrounding the circumference of the liquid injection hole (110), and the connecting body (200) having a through hole (210) communicating with the liquid injection hole (110); a cover body (300), the cover body (300) being arranged on the connecting body (200) to close the liquid injection hole (110); The peripheral side of the cover body (300) is welded to the connecting body (200) to form a welding portion, and the welding portion penetrates the connecting body (200) and extends into the cover body (100).

2. The battery cover assembly according to claim 1, wherein: The cover body (100) is an aluminum alloy piece, and the connector (200) and the cover body (300) are both aluminum pieces.

3. The battery cover assembly according to claim 1, wherein: The cover body (300) comprises a sealing portion (310) and a first flange portion (320) connected to the periphery of the sealing portion (310) and turned outward, and the peripheral side of the first flange portion (320) is welded to the connecting body (200).

4. The battery cover assembly according to claim 3, wherein: The sealing portion (310) has an opening (311) on a side facing the connector (200), and the opening (311) is communicated with the liquid injection hole (110).

5. The battery cover assembly according to claim 3, wherein: The connecting body (200) has a first annular groove (220) for accommodating the first flange portion (320), and the first flange portion (320) is inserted into the first annular groove (220).

6. The battery cover assembly according to claim 5, characterized in that: The side wall of the first annular groove (220) is inclined toward a side away from the first flange portion (320).

7. The battery cover assembly according to claim 5, wherein: The connecting body (200) includes a connecting portion (201), and the cover body (100) has a second annular groove (120) for accommodating the connecting portion (201); At least a portion of the connecting portion (201) is inserted into the second annular groove (120), and the first annular groove (220) is located on a side of the connecting portion (201) facing away from the second annular groove (120).

8. The battery cover assembly according to claim 7, wherein: The side wall of the second annular groove (120) is inclined toward a side away from the connecting portion (201).

9. The battery cover assembly according to claim 7, wherein: The connecting body (200) further comprises a second flange portion (202) arranged on the peripheral side of the connecting portion (201) and turned outward, the cover body (100) comprises a third annular groove (130) for accommodating the second flange portion (202), and the second flange portion (202) is inserted into the third annular groove (130).

10. The battery cover assembly according to any one of claims 1 to 9, characterized in that: It also includes a blocking piece (400), which is inserted into the liquid injection hole (110) and the through hole (210).

11. A battery, characterized in that: The invention comprises a battery cell, a shell and a battery cover assembly according to any one of claims 1 to 10, wherein the battery cell is arranged in the shell, and the cover body (100) in the battery cover assembly is covered on the shell.

12. A battery pack, characterized in that: The invention comprises a battery pack body and at least one battery according to claim 11 arranged on the battery pack body.

13. An electrical device, characterized in that: comprising a device body, wherein the battery according to claim 11 is provided on the device body; Alternatively, the device body is provided with a battery pack as claimed in claim 12.

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