Sealing assembly, battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a sealing assembly, a battery cover plate and a battery. The sealing assembly comprises a sealing ring and a sealing nail. And the sealing ring is partially embedded in a sinking groove in the circumferential direction of the liquid injection hole. The sealing nail is provided with a pressing part and a fixing part which are connected with each other. The fixing part sequentially penetrates through the sealing ring and the liquid injection hole and then presses the sealing ring on the first end face of the top cover piece, then the sealing nail is rotated by 90 degrees, and at the moment, the fixing part abuts against the second end face of the top cover piece and is connected with the second end face in a clamped mode. A gap between the top cover piece and the pressing part is sealed through the compressed sealing ring, and the compressed sealing ring has certain bounce to lock the sealing nail and the top cover piece. Due to the fact that the fixing part and the top cover piece are connected in a clamping mode, when secondary liquid injection is needed, the sealing nail can be rapidly detached from the top cover piece. The utility model further provides a battery cover plate and a battery. The battery cover plate comprises the sealing assembly.

Description

Technical Field

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

[0002] At present, the sealing method used for the injection hole on the battery cover is usually: insert a sealing nail into the injection hole, set an aluminum nail in the circumferential groove of the injection hole, and then weld the aluminum nail to the side wall of the groove to realize the sealing assembly of the injection hole.

[0003] However, in the above sealing assembly, when the aluminum nail is welded to the side wall of the sink, due to a certain defective rate of the welding process, there may be pores at the weld, resulting in poor sealing, which requires inspection of the weld, and low production efficiency; and welding slag may also appear during welding, affecting the appearance. In addition, after multiple charge and discharge cycles, the battery will lose electrolyte. When using the above sealing assembly, since the aluminum nail is welded to the side wall of the sink, the aluminum nail cannot be disassembled intact and can only be removed violently, and the battery cannot be refilled with electrolyte, which affects the battery life. Utility Model Content

[0004] The utility model aims to provide a sealing assembly, a battery cover and a battery, which can realize good sealing of a liquid injection hole, are convenient to disassemble and install, and can perform secondary liquid injection to extend the service life of the battery.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a sealing assembly for sealing a liquid injection hole on a top cover sheet, wherein a recessed groove is provided around the liquid injection hole, and the sealing assembly comprises:

[0007] A sealing ring is made of a flexible material with elastic deformation capability, and the sealing ring is partially embedded in the sink;

[0008] The sealing nail is made of a rigid material, and has a pressing part and a fixing part connected to each other. The fixing part passes through the sealing ring and the injection hole in sequence and then rotates. The pressing part presses the sealing ring against the first end face of the top cover sheet, and the fixing part presses against the second end face of the top cover sheet.

[0009] Optionally, the sealing nail further includes a connecting portion, two ends of which are respectively connected to the pressing portion and the fixing portion, and the connecting portion is penetrated through the sealing ring and the liquid injection hole.

[0010] Optionally, the length dimension of the injection hole along the first direction is a, and the length dimension of the injection hole along the second direction is b;

[0011] After the sealing assembly is assembled with the top cover sheet, the length of the fixing portion along the first direction is c, and the length of the fixing portion along the second direction is d, wherein d<b<c<a.

[0012] Optionally, before the sealing pin is assembled with the top cover sheet, the thickness of the sealing ring along the third direction is greater than the depth of the sink groove along the third direction.

[0013] Optionally, a groove is provided on an end surface of the pressing portion away from the fixing portion.

[0014] Optionally, the groove is in a straight line shape, a cross shape or a polygonal shape.

[0015] In a second aspect, the utility model provides a battery cover plate, comprising a top cover sheet and a sealing assembly in any of the above schemes, wherein the top cover sheet is provided with a liquid injection hole, and the sealing assembly is arranged at the liquid injection hole.

[0016] Optionally, the battery cover plate further comprises a lower plastic, and a avoidance hole is provided on the lower plastic at a position corresponding to the injection hole, and the avoidance hole is used to avoid the fixing portion of the sealing assembly.

[0017] Optionally, the avoidance hole is square or circular, the side length or diameter of the avoidance hole is e, and after the sealing assembly is assembled with the top cover sheet, the length of the fixing portion along the first direction is c, and e>c.

[0018] In a third aspect, the utility model provides a battery, comprising the battery cover in any of the above solutions.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a sealing assembly, including a sealing ring and a sealing pin. The sealing ring is made of a flexible material with elastic deformation ability, and the sealing ring is partially embedded in a sink groove around the injection hole. The sealing pin is made of a rigid material, and the sealing pin has a clamping part and a fixing part connected to each other. The fixing part passes through the sealing ring and the injection hole in turn and presses the sealing ring against the first end face of the top cover sheet, and then rotates the sealing pin 90°. At this time, the fixing part presses against the second end face of the top cover sheet and is clamped with the second end face, and the sealing pin is installed at the injection hole through the cooperation of the clamping part and the fixing part. The gap between the top cover sheet and the clamping part is sealed by the compressed sealing ring to avoid leakage of electrolyte, and the compressed sealing ring has a certain rebound force, which can lock the sealing pin and the top cover sheet. Since the connection between the fixing part and the top cover sheet is a clamping connection, no welding is required. When secondary injection is required, the sealing pin can be quickly removed from the top cover sheet to facilitate secondary injection.

[0021] The utility model provides a battery cover plate, comprising a top cover sheet and the above-mentioned sealing component, wherein the top cover sheet is provided with a liquid injection hole, and the sealing component is arranged at the liquid injection hole, and the liquid injection hole can be well sealed by the sealing component, thereby avoiding the leakage problem caused by poor welding between the conventional aluminum nail and the top cover sheet, and the sealing component is convenient to disassemble and assemble, and after the electrolyte is lost, the sealing component can be removed, and then the electrolyte can be refilled into the battery, thereby extending the service life.

[0022] The utility model also provides a battery, including the battery cover. By adopting the battery cover of the utility model, it can ensure that the battery shell of the battery is well sealed, and it is not easy to leak at the injection hole. At the same time, after the electrolyte inside the battery shell is reduced, the sealing component can be removed for secondary injection, and the disassembly and assembly are relatively convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the sealing nail provided in the first embodiment of the utility model;

[0024] Figure 2 It is a schematic structural diagram of the sealing nail provided in the first embodiment of the utility model from another perspective;

[0025] Figure 3 This is a schematic diagram of the structure of the sealing assembly provided in the first embodiment of the present utility model before assembly;

[0026] Figure 4 This is a schematic diagram of the structure of the sealing assembly provided in the first embodiment of the present utility model during assembly;

[0027] Figure 5 This is a schematic diagram of the structure of the sealing assembly provided in the first embodiment of the present utility model after assembly;

[0028] Figure 6 It is an exploded view of the battery cover provided in the first embodiment of the present utility model;

[0029] Figure 7 It is a structural schematic diagram of the battery cover provided in the first embodiment of the utility model;

[0030] Figure 8 is a schematic structural diagram of the battery cover provided in the first embodiment of the utility model from another viewing angle;

[0031] Fig. 9 It is a bottom view of the battery cover provided in the first embodiment of the utility model;

[0032] Fig.10 yes Fig. 9 A partial enlarged view of the middle A;

[0033] Fig.11It is a structural schematic diagram of the sealing nail provided in the second embodiment of the utility model;

[0034] Fig.12 It is a schematic diagram of the structure of the sealing nail provided in the third embodiment of the present utility model.

[0035] In the figure:

[0036] 10. Top cover; 11. Liquid injection hole; 12. Sink; 20. Lower plastic; 21. Avoidance hole;

[0037] 100, sealing ring; 200, sealing pin; 210, pressing part; 211, groove; 220, fixing part; 230, connecting part. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] Embodiment 1

[0043] like Figure 1-Figure 5 As shown, this embodiment provides a sealing assembly, which is used to seal the injection hole 11 on the top cover sheet 10, and a recessed groove 12 is provided around the injection hole 11. The sealing assembly includes a sealing ring 100 and a sealing pin 200. The sealing ring 100 is made of a flexible material with elastic deformation ability, and a portion of the sealing ring 100 is embedded in the recessed groove 12. The sealing pin 200 is made of a rigid material, and the sealing pin 200 has a pressing portion 210 and a fixing portion 220 connected to each other. When installing the sealing nail 200, first, the fixing part 220 is passed through the sealing ring 100 and the injection hole 11 in sequence, and the pressing part 210 presses the sealing ring 100 against the first end face of the top cover sheet 10, at which time the sealing ring 100 is compressed, and then the sealing nail 200 is rotated 90°, at which time the fixing part 220 is pressed against the second end face of the top cover sheet 10 and is clamped with the second end face, and the sealing nail 200 is installed at the injection hole 11 through the cooperation of the pressing part 210 and the fixing part 220. Among them, the first end face of the top cover sheet 10 is the end face on the side of the battery cell away from the inside of the battery, and the second end face is the end face on the side close to the battery cell.

[0044] The compressed sealing ring 100 seals the gap between the top cover sheet 10 and the pressing part 210 to prevent leakage of electrolyte, and the compressed sealing ring 100 has a certain rebound force, which can lock the sealing nail 200 with the top cover sheet 10. In addition, in this embodiment, the connection between the fixing part 220 and the top cover sheet 10 is a card connection, and no welding is required. When secondary liquid injection is required, the sealing nail 200 can be removed from the top cover sheet 10 to facilitate secondary liquid injection. The installation method of the sealing nail 200 in this embodiment is simple and fast, and the disassembly and assembly efficiency is high.

[0045] It should be noted that before the sealing pin 200 is assembled with the top cover sheet 10, that is, before the sealing pin is rotated 90°, the pressing portion 210 of the sealing pin 200 is aligned along the third direction ( Figure 3 The projection of the top cover sheet 10 (in the Z-axis direction shown in FIG) can cover the recessed groove 12, which makes the contact area between the pressing portion 210 and the sealing ring 100 larger and the sealing ring 100 is subjected to a more uniform force. In addition, before the sealing ring 100 is compressed, the thickness of the sealing ring 100 along the third direction is greater than the depth of the recessed groove 12 along the third direction (see FIG. Figure 3 This arrangement is to ensure that the pressing portion 210 of the sealing pin 200 can compress the sealing ring 100 along its thickness direction, thereby ensuring good sealing between the pressing portion 210 and the top cover sheet 10. Otherwise, if the thickness of the sealing ring 100 along the third direction is less than or equal to the depth of the sink 12 along the third direction, that is, the sealing ring 100 is completely embedded in the sink 12, then the pressing portion 210 cannot be compressed along the axial direction of the injection hole 11 (i.e. Figure 3 The sealing ring 100 is compressed (in the Z-axis direction) and is brought into close contact with the top cover sheet 10, which may result in a poor seal.

[0046] Furthermore, the sealing nail 200 further includes a connecting portion 230, one end of which is connected to the center of the pressing portion 210, and the other end of the connecting portion 230 is connected to the fixing portion 220 along the second direction ( Figure 5 The connecting portion 230 is connected at the middle position of the length of the sealing ring 100 (in the X-axis direction), and the connecting portion 230 is penetrated by the sealing ring 100 and the injection hole 11. Exemplarily, the pressing portion 210, the fixing portion 220 and the connecting portion 230 are an integrated structure and can be formed by machining.

[0047] In some embodiments, the sealing nail 200 can be made of aluminum, or other metal materials, such as stainless steel and other materials with high mechanical strength, which are not listed here. The sealing ring 100 can be made of elastic and flexible materials such as rubber, such as fluororubber, which are not listed here.

[0048] Continue to see Fig. 9 and Fig.10 In this embodiment, the injection hole 11 is rectangular, the length of the injection hole 11 along the first direction is a, and the length of the injection hole 11 along the second direction is b. The fixing portion 220 is a columnar body with a rectangular cross section. The cross section here refers to the cross section with Fig. 9 The cross section is parallel to the XY plane in the middle. After the sealing assembly is assembled with the top cover sheet 10, the length of the fixing portion 220 along the first direction is c, and the length of the fixing portion 220 along the second direction is d, wherein d<b<c<a. The connecting portion 230 is a columnar body with a square cross section, and the cross section here also refers to the cross section with Fig. 9 The side length of the square is d, which is equal to the length of the fixing portion 220 along the second direction. Fig. 9 The Y-axis direction in the second direction refers to Fig.10By adopting the above-mentioned size setting, the connecting portion 230 and the fixing portion 220 can smoothly pass through the injection hole 11, and ensure that after the sealing nail 200 is rotated 90°, the fixing portion 220 can be engaged with the second end surface of the top cover sheet 10, ensuring that the sealing nail 200 can be firmly locked on the top cover sheet 10.

[0049] Furthermore, in this embodiment, a groove 211 is provided on the end surface of the pressing portion 210 away from the fixing portion 220. By providing the groove 211, the auxiliary tool can be limited, which is convenient for the staff to use the auxiliary tool to rotate the sealing nail 200, avoid slipping when rotating the sealing nail 200, save time and effort, and is easy to operate. For example, the groove 211 can be in a straight, cross, hexagonal or other polygonal shape. The auxiliary tool can be a flat screwdriver, a cross screwdriver or a hexagonal screwdriver, etc., which correspond to the shape of the groove 211, respectively, so as to facilitate the disassembly and assembly of the sealing nail 200.

[0050] See also Figure 6-Figure 8 The present embodiment provides a battery cover, which includes a top cover sheet 10 and the above-mentioned sealing assembly. The top cover sheet 10 is provided with an injection hole 11, and the sealing assembly is arranged at the injection hole 11. The injection hole 11 can be well sealed by the sealing assembly to avoid the leakage problem caused by poor welding between the conventional aluminum nail and the top cover sheet 10. At the same time, the sealing assembly is easy to disassemble and assemble. After the electrolyte is lost, the sealing assembly can be removed, and then the electrolyte can be refilled into the battery, thereby extending the service life.

[0051] Furthermore, in this embodiment, the battery cover plate further includes a lower plastic 20, which mainly supports and insulates the top cover sheet 10. Generally, the lower plastic 20 is made of PP material. An avoidance hole 21 is provided at the position corresponding to the injection hole 11 on the lower plastic 20, and the fixing portion 220 of the sealing nail 200 can be avoided through the avoidance hole 21, so that the sealing nail 200 will not interfere with the lower plastic 20 when rotating, so as to facilitate disassembly.

[0052] Continue to see Fig. 9 and Fig.10 In this embodiment, the avoidance hole 21 is square, and the side length of the avoidance hole 21 is e. After the sealing assembly is assembled with the top cover sheet 10, the length of the fixing portion 220 along the first direction is c, e>c, and e>a. Therefore, the fixing portion 220 will not interfere with the lower plastic 20 when rotating, and the rotation is smooth.

[0053] Of course, in some optional solutions, the avoidance hole 21 can also be circular, the diameter of the avoidance hole 21 is e, and after the sealing assembly is assembled with the top cover sheet 10, the length of the fixing portion 220 along the first direction is c, e>c, and e>a. Similarly, the fixing portion 220 will not interfere with the lower plastic 20 when rotating, and the rotation is smooth.

[0054] This embodiment also provides a battery, including a battery case, a battery cell and the above-mentioned battery cover. The battery case is hollow inside and has an opening on one side. The battery cell is loaded into the battery case through the opening. The battery cover is encapsulated at the opening, and the opening is sealed by the battery cover. An injection hole 11 is provided on the top cover sheet 10 of the battery cover, and electrolyte can be injected into the battery case through the injection hole 11. After the electrolyte is injected, the sealing assembly can be installed at the injection hole 11 to seal the injection hole 11.

[0055] By adopting the battery cover in this embodiment, the battery shell can be well sealed, and leakage is not likely to occur at the injection hole 11. At the same time, after the electrolyte inside the battery shell is reduced, the sealing component can be removed for secondary injection, and disassembly and assembly are relatively convenient and quick.

[0056] Embodiment 2

[0057] This embodiment further provides a sealing assembly, which is different from the sealing assembly in the first embodiment in that the structure of the sealing pin 200 in this embodiment is different.

[0058] See also Fig.11 In this embodiment, the connecting portion 230 is a columnar body with a square cross section. Fig.11 The fixing portion 220 is a cylindrical body with a waist-shaped cross section, the two opposite sides of the waist along the Y-axis direction are straight sides, and the two opposite sides of the waist along the X-axis direction are arc sides. The cross section of the fixing portion 220 here also refers to the same as Fig.11 In the cross section parallel to the XY plane, the Z-axis direction is the height direction of the fixing portion 220 .

[0059] Further, one end of the connecting portion 230 of the sealing nail 200 is connected to the center of the pressing portion 210, and the other end of the connecting portion 230 is connected to the fixing portion 220 along the second direction ( Fig.11 The connecting portion 230 is connected at the middle position of the length of the sealing ring 100 (in the X-axis direction), and is penetrated by the sealing ring 100 and the liquid injection hole 11.

[0060] By adopting the above-mentioned sealing nail 200, it is also possible to cooperate with the sealing ring 100 to achieve the sealing of the injection hole 11. Specifically, the first end face of the top cover sheet 10 is pressed by the pressing portion 210, and the fixing portion 220 is pressed against and clamped with the second end face of the top cover sheet 10. After the sealing ring 100 is compressed, the gap between the top cover sheet 10 and the pressing portion 210 is sealed to prevent electrolyte leakage, and the compressed sealing ring 100 has a certain rebound force, which can lock the sealing nail 200 and the top cover sheet 10. In addition, the sealing nail 200 in this embodiment can also be removed from the top cover sheet 10. The installation method is simple and fast, the disassembly and assembly efficiency is high, and it is convenient for secondary injection.

[0061] The present embodiment provides a battery cover, which includes a top cover sheet 10 and the above-mentioned sealing assembly. The top cover sheet 10 is provided with an injection hole 11, and the sealing assembly is arranged at the injection hole 11. The injection hole 11 can be well sealed by the sealing assembly to avoid leakage problems caused by poor welding between conventional aluminum nails and the top cover sheet 10. At the same time, the sealing assembly is easy to disassemble and assemble. After the electrolyte is lost, the sealing assembly can be removed, and then the electrolyte can be refilled into the battery, thereby extending the service life.

[0062] This embodiment also provides a battery, including a battery case, a battery cell and the above-mentioned battery cover. The interior of the battery case is hollow and has an opening on one side. The battery cell is loaded into the battery case through the opening, and the battery cover is encapsulated at the opening, and the opening is sealed by the battery cover. An injection hole 11 is provided on the top cover sheet 10 of the battery cover, and electrolyte can be injected into the battery case through the injection hole 11. After the electrolyte is injected, the sealing assembly can be installed at the injection hole 11 to seal the injection hole 11. By adopting the battery cover in this embodiment, it can be ensured that the battery case is well sealed, and leakage is not likely to occur at the injection hole 11. At the same time, after the electrolyte inside the battery case is reduced, the sealing assembly can be removed for secondary injection, and disassembly and assembly are relatively convenient and quick.

[0063] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0064] Embodiment 3

[0065] This embodiment further provides a sealing assembly, which is different from the sealing assembly in the first embodiment in that the structure of the sealing pin 200 in this embodiment is different.

[0066] See also Fig.12 In this embodiment, the connecting portion 230 is a cylindrical body with a circular cross section. Fig.12 The fixing portion 220 is a cylindrical body with a circular cross section. Here, the cross section of the fixing portion 220 refers to the cross section parallel to the XY plane. Fig.12 In the cross section parallel to the YZ plane, the X-axis direction is the length direction of the fixing portion 220 .

[0067] Further, one end of the connecting portion 230 of the sealing nail 200 is connected to the center of the pressing portion 210, and the other end of the connecting portion 230 is connected to the fixing portion 220 along the second direction ( Fig.12 The connecting portion 230 is connected at the middle position of the length of the sealing ring 100 (in the X-axis direction), and is penetrated by the sealing ring 100 and the liquid injection hole 11.

[0068] By adopting the above-mentioned sealing nail 200, it is also possible to cooperate with the sealing ring 100 to achieve the sealing of the injection hole 11. Specifically, the first end face of the top cover sheet 10 is pressed by the pressing portion 210, and the fixing portion 220 is pressed against and clamped with the second end face of the top cover sheet 10. After the sealing ring 100 is compressed, the gap between the top cover sheet 10 and the pressing portion 210 is sealed to prevent electrolyte leakage, and the compressed sealing ring 100 has a certain rebound force, which can lock the sealing nail 200 and the top cover sheet 10. In addition, the sealing nail 200 in this embodiment can also be removed from the top cover sheet 10. The installation method is simple and fast, the disassembly and assembly efficiency is high, and it is convenient for secondary injection.

[0069] The present embodiment provides a battery cover, which includes a top cover sheet 10 and the above-mentioned sealing assembly. The top cover sheet 10 is provided with an injection hole 11, and the sealing assembly is arranged at the injection hole 11. The injection hole 11 can be well sealed by the sealing assembly to avoid leakage problems caused by poor welding between conventional aluminum nails and the top cover sheet 10. At the same time, the sealing assembly is easy to disassemble and assemble. After the electrolyte is lost, the sealing assembly can be removed, and then the electrolyte can be refilled into the battery, thereby extending the service life.

[0070] This embodiment also provides a battery, including a battery case, a battery cell and the above-mentioned battery cover. The interior of the battery case is hollow and has an opening on one side. The battery cell is loaded into the battery case through the opening, and the battery cover is encapsulated at the opening, and the opening is sealed by the battery cover. An injection hole 11 is provided on the top cover sheet 10 of the battery cover, and electrolyte can be injected into the battery case through the injection hole 11. After the electrolyte is injected, the sealing assembly can be installed at the injection hole 11 to seal the injection hole 11. By adopting the battery cover in this embodiment, it can be ensured that the battery case is well sealed, and leakage is not likely to occur at the injection hole 11. At the same time, after the electrolyte inside the battery case is reduced, the sealing assembly can be removed for secondary injection, and disassembly and assembly are relatively convenient and quick.

[0071] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0072] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A sealing assembly for sealing a liquid injection hole (11) on a top cover sheet (10), wherein a sink groove (12) is provided around the liquid injection hole (11), characterized in that: The sealing assembly comprises: The sealing ring (100) is made of a flexible material with elastic deformation capability, and the sealing ring (100) is partially embedded in the sink (12); The sealing pin (200) is made of a rigid material. The sealing pin (200) comprises a pressing portion (210) and a fixing portion (220) which are connected to each other. The fixing portion (220) passes through the sealing ring (100) and the injection hole (11) in sequence and then rotates. The pressing portion (210) presses the sealing ring (100) against the first end surface of the top cover sheet (10), and the fixing portion (220) presses against the second end surface of the top cover sheet (10).

2. The sealing assembly according to claim 1, characterized in that: The sealing nail (200) further comprises a connecting portion (230), the two ends of which are respectively connected to the pressing portion (210) and the fixing portion (220), and the connecting portion (230) is penetrated through the sealing ring (100) and the liquid injection hole (11).

3. The sealing assembly according to claim 2, characterized in that: The length dimension of the liquid injection hole (11) along the first direction is a, and the length dimension of the liquid injection hole (11) along the second direction is b; After the sealing assembly is assembled with the top cover sheet (10), the length of the fixing portion (220) along the first direction is c, and the length of the fixing portion (220) along the second direction is d, wherein d<b<c<a.

4. The sealing assembly according to claim 1, characterized in that: Before the sealing pin (200) is assembled with the top cover sheet (10), the thickness of the sealing ring (100) along the third direction is greater than the depth of the sink groove (12) along the third direction.

5. The sealing assembly according to claim 1, characterized in that: A groove (211) is provided on the end surface of the pressing portion (210) on a side away from the fixing portion (220).

6. The sealing assembly according to claim 5, characterized in that The groove (211) is in a straight line shape, a cross shape or a polygonal shape.

7. A battery cover, characterized in that: It comprises a top cover sheet (10), and a sealing assembly according to any one of claims 1 to 6, wherein the top cover sheet (10) is provided with a liquid injection hole (11), and the sealing assembly is arranged at the liquid injection hole (11).

8. The battery cover according to claim 7, characterized in that: The battery cover plate further comprises a lower plastic (20), and a avoidance hole (21) is provided on the lower plastic (20) at a position corresponding to the injection hole (11), and the avoidance hole (21) is used to avoid the fixing part (220) of the sealing assembly.

9. The battery cover according to claim 8, characterized in that: The avoidance hole (21) is square or circular, the side length or diameter of the avoidance hole (21) is e, and after the sealing assembly is assembled with the top cover sheet (10), the length of the fixing portion (220) along the first direction is c, and e>c.

10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 7 to 9.

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