Battery cover plate assembly, battery and electric device

Abstract

The application relates to the battery technical field and discloses a battery cover plate assembly, a battery and an electric device, wherein the battery cover plate assembly comprises a cover plate body and a fastener, the cover plate body comprises opposite first and second sides, the cover plate body is provided with a liquid injection hole, a liquid injection end of the liquid injection hole is arranged on the first side of the cover plate body, and a liquid outlet end of the liquid injection hole is arranged on the second side of the cover plate body; the fastener is arranged on the second side of the cover plate body, and the fastener is used for connecting a plugging piece penetrating the liquid injection hole. The application arranges the fastener on the second side of the cover plate body, when liquid supplement is needed for the battery cell, after the sealing of the liquid injection hole is released and electrolyte is injected, the plugging piece can be penetrated into the liquid injection hole and connected with the fastener, and the plugging piece can seal the liquid injection hole. The sealing mode of the fastener matched with the plugging piece does not need to seal the liquid injection hole by welding, so that the deformation of the battery cover plate is avoided, and the sealing reliability of the liquid injection hole area is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cover assembly, a battery, and an electrical device. Background Technology

[0002] During long-term cyclic use, the electrolyte inside a battery cell is gradually consumed due to various chemical reactions. When the electrolyte is depleted to a certain extent, insufficient electrolyte becomes a key factor limiting the cell's performance. Existing technology shows that by replenishing electrolyte into the battery cell, some of its performance can be restored, thereby extending the overall lifespan of the cell.

[0003] The common method for replenishing electrolyte is through a pre-drilled injection hole on the battery cover. This process typically involves unsealing the injection hole, injecting electrolyte, and resealing the injection hole. However, existing technologies generally use welding to seal the injection hole. With repeated electrolyte replenishments, the injection hole area undergoes repeated welding and unsealing operations. This causes cumulative deformation of the battery cover around the injection hole due to repeated thermal cycles, affecting the sealing reliability of the injection hole area and ultimately reducing the safety and lifespan of the battery cell. Utility Model Content

[0004] In view of this, this application provides a battery cover assembly, a battery, and an electrical device to solve the problem that when electrolyte is replenished multiple times, the injection hole area needs to undergo repeated welding and unsealing operations, which affects the sealing reliability of the injection hole area and reduces the safety and service life of the battery cell.

[0005] In a first aspect, this application provides a battery cover assembly, including a cover body and fasteners. The cover body includes a first side and a second side opposite to each other. A liquid injection hole is provided on the cover body, with the injection end of the hole located on the first side and the outlet end located on the second side. Fasteners are arranged on the second side of the cover body and are used to connect a sealing member passing through the liquid injection hole.

[0006] Beneficial effects: By installing fasteners on the second side of the cover plate, when electrolyte needs to be added to the battery cell, the seal of the injection hole is released and electrolyte is injected. The sealing component can then be inserted through the injection hole and connected to the fasteners, thus sealing the injection hole. The fasteners and sealing components work together without the need for welding to seal the injection hole, preventing battery cover plate deformation and ensuring reliable sealing in the injection hole area. Furthermore, the fasteners are located on the second side of the cover plate, preventing them from being exposed outside the battery and improving the overall aesthetics of the battery.

[0007] In one alternative embodiment, the fastener is configured as a first fastener connected to a second side of the cover plate body.

[0008] Beneficial effects: The first fastener is directly connected to the second side of the cover plate body, which improves the connection strength between the first fastener and the cover plate body. After the subsequent sealing component is connected to the first fastener, the connection strength between the sealing component and the cover plate body can be improved, thereby improving the sealing performance of the injection hole.

[0009] In one alternative embodiment, the fastener is configured as a second fastener, which is spaced apart from the second side of the cover body; the battery cover assembly further includes a plastic layer disposed on one side of the second side of the cover body, and the second fastener is detachably connected to the plastic layer.

[0010] Beneficial effects: The second fastener is set on the plastic layer and is detachably connected to the plastic layer. After the sealing part passes through the injection hole and the sealing part is connected to the second fastener, the second fastener is moved by the sealing part, so that the second fastener is separated from the plastic layer, and the sealing part is tightened by the second fastener to ensure that the sealing part seals the injection hole.

[0011] In one alternative embodiment, a limiting structure is provided on the second side of the cover plate body, the limiting structure being adapted to restrict the rotation of the fastener.

[0012] Beneficial effects: After the sealing component is connected to the second fastener, the sealing component drives the second fastener to move, so that the second fastener enters the limiting structure. Then the sealing component rotates, and the second fastener cannot follow the rotation of the sealing component under the action of the limiting structure, so that the sealing component is displaced relative to the second fastener, thereby effectively sealing the injection hole.

[0013] In one alternative embodiment, the limiting structure includes a groove provided on a second side of the cover plate body, wherein the outer wall of the fastener is engaged with the inner wall of the groove.

[0014] Beneficial effects: The limiting structure adopts a groove design, which is simple and highly practical. Furthermore, the inner wall of the groove engages with the outer wall of the second fastener, not only restricting the rotation of the second fastener but also reducing the gap between the inner wall of the groove and the outer wall of the second fastener, thus improving the sealing performance of the injection hole.

[0015] In one alternative embodiment, the fastener is provided with a through hole, and the inner wall of the through hole is provided with an internal thread, the internal thread being used to connect with the sealing member.

[0016] Beneficial effects: The through hole on the fastener allows the sealing component to pass through. The fastener and the sealing component are connected by threads, which makes the connection and disassembly of the fastener and the sealing component simple and convenient, and can improve the sealing performance between the fastener and the sealing component.

[0017] In one alternative embodiment, the diameter of the injection hole is larger than the diameter of the through hole.

[0018] Beneficial effects: The outer diameter of the sealing component is matched with the diameter of the through hole, making it easy for the sealing component to pass through the injection hole and extend into the through hole. During the rotation of the sealing component, there is a gap between the outer wall of the sealing component and the inner wall of the injection hole, which avoids the sealing component from damaging the inner wall of the injection hole, thereby improving the sealing performance of the injection hole.

[0019] In one alternative embodiment, a mounting groove is provided on the first side of the cover plate body, and a sealing element is provided in the mounting groove. The sealing element is used to close the gap between the sealing element and the first side of the cover plate body.

[0020] Beneficial effects: A sealing element is provided on the first side of the plug and the cover plate body, which further improves the sealing performance of the injection hole.

[0021] Secondly, this application provides a battery, including a housing and a battery cover assembly as described in any one of the above.

[0022] Beneficial effects: The battery has the battery cover assembly described above. When the battery cells are replenished with electrolyte multiple times, fasteners are set on the second side of the cover body. The fasteners and the sealing components work together to seal the injection hole, so that the injection hole area does not need to undergo repeated welding and unsealing operations. This avoids deformation of the battery cover around the injection hole, ensures the sealing reliability of the injection hole area, and improves the safety and service life of the battery.

[0023] Thirdly, this application provides an electrical device including the aforementioned battery. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram illustrating the connection relationship between the cover plate body and the outer shell in an embodiment of this application;

[0026] Figure 2This is a schematic diagram of the cover plate body according to an embodiment of this application;

[0027] Figure 3 Examples of embodiments of this application Figure 2 A magnified view of a section at point A in the middle;

[0028] Figure 4 This is a structural schematic diagram showing the positional relationship between the first fastener and the cover plate body in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram illustrating the connection relationship between the second fastener and the plastic layer in an embodiment of this application.

[0030] Figure 6 This is a schematic diagram illustrating the connection relationship between the second fastener and the limiting structure in an embodiment of this application.

[0031] Figure 7 This is a structural schematic diagram of the second fastener and the sealing component fastened in an embodiment of this application;

[0032] Figure 8 This is an exploded view showing the positional relationship between the second fastener and the limiting structure in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Cover plate body; 101. First side; 102. Second side;

[0035] 2. Injection hole;

[0036] 3. Sealing component; 301. Sealing section; 302. Connecting section;

[0037] 4. First fastener; 5. Second fastener; 6. Plastic layer; 7. Limiting structure; 8. Through hole; 9. Assembly groove; 10. Seal; 11. Housing; 12. Sealing nail; 13. Sealing aluminum nail. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In the prior art, sealing the electrolyte injection hole 2 on the battery cover typically involves inserting a sealing nail 12 through the injection hole 2 and then welding a sealing aluminum nail 13 to the first side 101 of the cover body 1. During electrolyte replenishment, the sealing aluminum nail 13 welded to the cover body 1 needs to be removed and the sealing nail 12 pulled out. After replenishment, the sealing nail 12 is reinserted into the injection hole 2 and the sealing aluminum nail 13 is re-welded. Since the cover body 1 is typically made of a smooth aluminum sheet, repeated welding and unsealing operations cause deformation of the smooth aluminum sheet, thus affecting the sealing reliability of the injection hole 2 area.

[0040] To solve the above problems, please refer to Figures 1-8 In a first aspect, embodiments of this application provide a battery cover assembly, including a cover body 1 and fasteners. The cover body 1 includes a first side 101 and a second side 102 opposite to each other. A liquid injection hole 2 is provided on the cover body 1, with the injection end of the liquid injection hole 2 located on the first side 101 and the outlet end of the liquid injection hole 2 located on the second side 102 of the cover body 1. Fasteners are arranged on the second side 102 of the cover body 1 and are used to connect a sealing member 3 that passes through the liquid injection hole 2.

[0041] First, it should be noted that, as Figure 3 As shown, the first side 101 of the cover body 1 refers to the outer surface of the battery cover assembly, and the second side 102 of the cover body 1 refers to the side opposite to the first side 101 of the cover body 1. The injection end of the injection hole 2 is located on the first side 101 of the cover body 1. During the replenishment operation, the electrolyte is injected through the injection end of the injection hole 2 and flows to the position to be replenished through the outlet end of the injection hole 2. The specific connection structure between the outlet end of the injection hole 2 and the position to be replenished is set according to actual needs and will not be described in detail here.

[0042] In this embodiment, a fastener is provided on the second side 102 of the cover plate body 1. The fastener is used in conjunction with the sealing member 3. When it is necessary to replenish the electrolyte in the cell, after releasing the seal of the injection hole 2 and injecting electrolyte, the sealing member 3 can be inserted into the injection hole 2 and connected to the fastener, so as to seal the injection hole 2 with the sealing member 3.

[0043] In one alternative implementation, such as Figure 2 , Figure 3 As shown, for batteries that have not undergone electrolyte replenishment, the electrolyte filling hole 2 on the cover body 1 can be sealed by the cooperation of sealing glue nail 12 and sealing aluminum nail 13 at the factory. The second side 102 of the cover body 1 is provided with fasteners. When electrolyte replenishment is required, the sealing aluminum nail 13 and sealing glue nail 12 are removed. After electrolyte replenishment is completed, the sealing member 3 is inserted into the electrolyte filling hole 2. The sealing member 3 cooperates with the fasteners to seal the electrolyte filling hole 2.

[0044] In another alternative embodiment, for batteries that have not undergone liquid replenishment, a sealing element 3 can be directly inserted into the liquid filling hole 2 on the cover body 1 at the factory. The sealing element 3 and the fastener cooperate to seal the liquid filling hole 2. When liquid replenishment is required, the sealing element 3 is removed, and after liquid replenishment is completed, the sealing element 3 is re-inserted into the liquid filling hole 2, which can also achieve the same sealing effect.

[0045] Optionally, the sealing element 3 is configured as a screw or bolt structure. The stud portion of the screw or bolt passes through the injection hole 2, and the nut portion of the screw or bolt covers the injection end of the injection hole 2 to achieve a seal.

[0046] Of course, in addition to the screws or bolts mentioned above, the sealing component 3 can also adopt other structures. Specifically, the sealing component 3 includes at least a sealing section 301 and a connecting section 302 that are connected to each other. After the liquid is replenished, the connecting section 302 of the sealing component 3 is inserted into the injection hole 2. The connecting section 302 is connected to the fastener, so that the sealing component 3 is fixed to the cover plate body 1 by the fastener. The sealing section 301 is located on the first side 101 of the cover plate body 1, and the sealing section 301 covers the injection end of the injection hole 2, thereby sealing the injection hole 2.

[0047] In one embodiment, the fastener is configured as a first fastener 4, which is connected to the second side 102 of the cover plate body 1.

[0048] In this embodiment, as Figure 4 As shown, the first fastener 4 has a first end face close to the cover plate body 1. The first end face of the first fastener 4 is fitted and fixed to the second side 102 of the cover plate body 1, so that the first fastener 4 is fixed to the second side 102 of the cover plate body 1 and a seal is maintained between the first end face of the first fastener 4 and the second side 102 of the cover plate body 1. The first fastener 4 is preferably a fastening nut. When the sealing member 3 is a bolt, the bolt and the fastening nut are threadedly connected. The cooperation between the bolt and the fastening nut improves the sealing effect at the connection between the two. At the same time, the nut of the bolt cooperates with the first side 101 of the cover plate body 1, which can further improve the sealing effect of the sealing member 3 on the injection hole 2.

[0049] This configuration ensures the connection strength between the first fastener 4 and the cover plate body 1, preventing connection failure under vibration. Furthermore, after the sealing component 3 is connected to the first fastener 4, the connection strength between the sealing component 3 and the cover plate body 1 is enhanced, thereby improving the sealing performance of the injection hole 2.

[0050] In this embodiment, fasteners are provided on the second side 102 of the cover plate body 1. The fasteners are used to connect and fix the sealing component 3. Compared with the method of directly machining threads on the inner wall of the injection hole 2 and connecting the sealing component 3 through the threads on the injection hole 2, this embodiment has lower requirements for the machining accuracy of the injection hole 2 and does not have the problem of machining the injection hole 2, which can easily lead to damage to the injection hole 2.

[0051] In one embodiment, in addition to the fastener being configured as a first fastener 4 connected to the second side 102 of the cover body 1, the fastener can also be configured as a second fastener 5, spaced apart from the second side 102 of the cover body 1; the battery cover assembly further includes a plastic layer 6, which is disposed on one side of the second side 102 of the cover body 1, and the second fastener 5 is detachably connected to the plastic layer 6.

[0052] In this embodiment, as Figure 5 , Figure 6 , Figure 7 As shown, when the injection hole 2 on the cover plate body 1 is sealed by the sealing nail 12 and the sealing aluminum nail 13, the second fastener 5 is fixed on the plastic layer 6. After the liquid is replenished, the sealing member 3 is inserted into the injection hole 2. The connecting section 302 of the sealing member 3 is engaged with the second fastener 5. The operator can manually or with a tool pull up the sealing member 3. The second fastener 5 is separated from the plastic layer 6 under the action of the sealing member 3, so that the second fastener 5 can be tightened on the sealing member 3 in the future.

[0053] Specifically, the second fastener 5 is a nut. During the injection molding stage of the plastic layer 6, the nut is embedded in the plastic layer 6. After the plastic layer 6 is formed, the nut is connected and fixed to the plastic layer 6. It will not fall off due to the impact force of the injection during the initial injection of electrolyte into the cell, nor will it fall off during battery use.

[0054] In one embodiment, a limiting structure 7 is provided on the second side 102 of the cover plate body 1, which is adapted to limit the rotation of the fastener.

[0055] In this embodiment, when the fastener is set as the first fastener 4, a limiting structure 7 can be provided on the second side 102 of the cover plate body 1, and the first fastener 4 can be fixed to the second side 102 of the cover plate body 1 by the limiting structure 7.

[0056] In this embodiment, as Figure 5 , Figure 6 , Figure 7As shown, when the fastener is set as the second fastener 5, a limiting structure 7 can be set on the second side 102 of the cover plate body 1. After the sealing member 3 is connected to the second fastener 5, by lifting the sealing member 3, the sealing member 3 drives the second fastener 5 to move towards the second side 102 of the limiting structure 7, so that the second fastener 5 enters the limiting structure 7. Then the sealing member 3 rotates, and the second fastener 5 cannot follow the rotation of the sealing member 3 under the action of the limiting structure 7. The sealing member 3 is threadedly connected to the second fastener 5, so that the sealing member 3 has a relative displacement relative to the second fastener 5, thereby effectively sealing the injection hole 2.

[0057] This configuration confines the second fastener 5 within the limiting structure 7, which provides support for the sealing component 3, thus fixing the sealing component 3 to the cover plate body 1.

[0058] In one embodiment, the limiting structure 7 includes a groove provided on the second side 102 of the cover plate body 1, and the outer side wall of the fastener is engaged with the inner side wall of the groove.

[0059] In this embodiment, when the fastener is set as the first fastener 4, in addition to the above-mentioned setting method in which the first end face of the first fastener 4 is directly attached and fixed to the second side 102 of the cover plate body 1, the first fastener 4 can also be connected to the cover plate body 1 through the limiting structure 7.

[0060] Optionally, the limiting structure 7 is a groove provided on the second side 102 of the cover plate body 1. The first fastener 4 is fixed to the second side 102 of the cover plate body 1 by interference fit with the groove.

[0061] Of course, in addition to the groove setting method mentioned above, the limiting structure 7 can also be a protruding ring protruding from the second side 102 of the cover plate body 1, or a buckle structure fixed on the second side 102 of the cover plate body 1. The first fastener 4 is fixed to the second side 102 of the cover plate body 1 by interference fit between the first fastener 4 and the protruding ring, or by buckle fit between the first fastener 4 and the buckle structure.

[0062] In this embodiment, as Figure 8 As shown, when the fastener is set as the second fastener 5, the limiting structure 7 is a groove provided on the second side 102 of the cover plate body 1. The groove is preferably a polygonal groove, so that the inner sidewall of the groove is quadrilateral, pentagonal or hexagonal. Taking the inner sidewall of the groove as hexagonal as an example, the second fastener 5 is a hexagonal nut. When the second fastener 5 is located in the groove, the outer sidewall of the second fastener 5 cooperates with the inner sidewall of the groove, so that the groove restricts the movement of the second fastener 5 relative to the cover plate body 1, thereby restricting the rotation of the second fastener 5, and thus enabling the sealing member 3 to move relative to the second fastener 5.

[0063] With this design, the limiting structure 7 adopts a polygonal groove, which is simple in structure and highly practical. Furthermore, the inner wall of the polygonal groove engages with the outer wall of the second fastener 5, which not only restricts the rotation of the second fastener 5 but also reduces the gap between the inner wall of the polygonal groove and the outer wall of the second fastener 5, thereby improving the sealing performance of the injection hole 2.

[0064] Alternatively, in addition to the polygonal groove arrangement described above, the limiting structure 7 can also have a protrusion or a recess on the inner wall of the groove, and a corresponding recess or protrusion on the outer wall of the second fastener 5. Taking the example of a recess on the inner wall of the groove and a protrusion on the outer wall of the second fastener 5, one end of the recess on the inner wall of the groove extends to the second side 102 of the cover plate body 1. During the movement of the second fastener 5 toward the second side 102 of the cover plate body 1, the protrusion on the outer wall of the second fastener 5 is inserted into the recess from the end of the recess. When the second fastener 5 moves to the preset position, the protrusion and the recess cooperate to restrict the rotation of the second fastener 5 relative to the groove, thereby restricting the rotation of the second fastener 5.

[0065] In one embodiment, the fastener is provided with a through hole 8, and the inner wall of the through hole 8 is provided with an internal thread for connecting with the sealing component 3.

[0066] In this embodiment, as Figure 8 As shown, the through hole 8 on the fastener is used for the sealing component 3 to pass through. The fastener and the sealing component 3 are connected by threads, which makes the connection and disassembly of the fastener and the sealing component 3 simple and convenient, and can improve the sealing performance between the fastener and the sealing component 3.

[0067] In one embodiment, the diameter of the injection hole 2 is larger than the diameter of the through hole 8.

[0068] In this embodiment, as Figure 5 , Figure 6 , Figure 7 As shown, the outer diameter of the sealing element 3 is adapted to the diameter of the through hole 8, making it easy for the sealing element 3 to pass through the injection hole 2 and extend into the through hole 8. During the rotation of the sealing element 3, there is a gap between the outer wall of the sealing element 3 and the inner wall of the injection hole 2, which prevents the sealing element 3 from damaging the inner wall of the injection hole 2, thereby improving the sealing performance of the injection hole 2.

[0069] In one embodiment, a mounting groove 9 is provided on the first side 101 of the cover plate body 1. The mounting groove 9 is used to install a sealing element 10, which is used to close the gap between the sealing element 3 and the first side 101 of the cover plate body 1.

[0070] In this embodiment, as Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the assembly groove 9 is a receiving groove recessed into the surface of the first side 101 of the cover plate body 1. When the sealing member 3 is used to seal the injection hole 2, a sealing member 10 is provided between the sealing member 3 and the first side 101 of the cover plate body 1. That is, the sealing member 10 is provided between the sealing section 301 of the sealing member 3 and the first side 101 of the cover plate body 1. The sealing performance of the injection hole 2 is further improved by the sealing member 10.

[0071] Specifically, the seal 10 can be a sealing ring, a sealing gasket, or other structures.

[0072] Secondly, this application provides a battery including a housing 11 and a battery cover assembly as described above.

[0073] In this embodiment, as Figure 1 As shown, the battery has the aforementioned battery cover assembly. When the battery cells are replenished with electrolyte multiple times, fasteners are provided on the second side 102 of the cover body 1. The fasteners cooperate with the sealing component 3 to seal the injection hole 2, so that the injection hole 2 area does not need to undergo repeated welding and unsealing operations, thereby avoiding deformation of the battery cover around the injection hole 2, ensuring the sealing reliability of the injection hole 2 area, and improving the safety and service life of the battery.

[0074] In this embodiment, the battery is a secondary battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.

[0075] Thirdly, this application provides an electrical device including the aforementioned battery.

[0076] In this embodiment, the electrical devices include, but are not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0077] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that, include: The cover plate body (1) includes a first side (101) and a second side (102) opposite to each other. The cover plate body (1) is provided with a liquid injection hole (2). The liquid injection end of the liquid injection hole (2) is located on the first side (101) of the cover plate body (1), and the liquid outlet end of the liquid injection hole (2) is located on the second side (102) of the cover plate body (1). Fasteners are arranged on the second side (102) of the cover plate body (1) for connecting the plug (3) that passes through the injection hole (2).

2. The battery cover assembly according to claim 1, characterized in that, The fastener is configured as a first fastener (4), which is connected to the second side (102) of the cover plate body (1).

3. The battery cover assembly according to claim 1, characterized in that, The fastener is configured as a second fastener (5), which is spaced apart from the second side (102) of the cover plate body (1); The battery cover assembly further includes a plastic layer (6), which is disposed on one side of the second side (102) of the cover body (1), and the second fastener (5) is detachably connected to the plastic layer (6).

4. The battery cover assembly according to claim 2 or 3, characterized in that, A limiting structure (7) is provided on the second side (102) of the cover plate body (1), the limiting structure (7) being adapted to restrict the rotation of the fastener.

5. The battery cover assembly according to claim 4, characterized in that, The limiting structure (7) includes a groove provided on the second side (102) of the cover plate body (1), and the outer side wall of the fastener is engaged with the inner side wall of the groove.

6. The battery cover assembly according to claim 1, characterized in that, The fastener is provided with a through hole (8), and the inner wall of the through hole (8) is provided with an internal thread, which is used to connect with the sealing member (3).

7. The battery cover assembly according to claim 6, characterized in that, The diameter of the injection hole (2) is larger than the diameter of the through hole (8).

8. The battery cover assembly according to claim 1, characterized in that, The first side (101) of the cover plate body (1) is provided with an assembly groove (9), and the assembly groove (9) is used to set a sealing element (10). The sealing element (10) is used to close the gap between the sealing element (3) and the first side (101) of the cover plate body (1).

9. A battery, characterized in that, include: Outer shell (11); The battery cover assembly according to any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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