Top cover assembly, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover assembly, a battery and electric equipment, which comprises a cover plate, a safety adapter and an elastic component, a pole is arranged on the cover plate; the safety adapter is arranged on one side of the cover plate and comprises a tab connecting part, a pole connecting part and a fusing part, the tab connecting part is used for being connected with a battery cell tab, the pole connecting part is used for being connected with a pole, the fusing part is connected with the tab connecting part and the pole connecting part, and the fusing part is used for fusing when being triggered; separating the tab connecting part from the pole connecting part to form a fracture; the elastic component is used for driving one end, close to the fusing part, of the tab connecting part or one end, close to the fusing part, of the pole connecting part to move towards the direction far away from the cover plate, so that the size of the fracture is increased. According to the utility model, the elastic component is arranged to enlarge the size of the fracture formed after the fusing part is fused, so that the circuit is prevented from being connected again, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly, a battery and an electrical device. Background Art

[0002] As batteries are increasingly used in people's daily lives, battery safety has become one of the most important concerns. In order to ensure the safety of batteries during use, different safety structures are preset when designing batteries to deal with problems that may arise during battery use.

[0003] Taking one of the safety structures as an example, a fuse structure is provided inside the battery. When a large current flows due to a short circuit or other fault in the battery, the fuse structure can be immediately melted to cut off the circuit connection to avoid a safety accident.

[0004] However, in the prior art, after the fuse structure is blown, the high voltage of the battery cell in the battery will still be loaded on the two ends of the fuse structure. When the two ends of the fuse structure are too close to each other, or when melted metal materials accumulate, the air between the two ends of the disconnected fuse structure may be broken by the high voltage and cause a fire, posing a safety hazard. Utility Model Content

[0005] To this end, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the two ends of the fuse structure are easily punctured by high voltage and cause fire when the distance between them is too close, which poses a safety hazard. A top cover assembly, a battery and an electrical device are provided, which enlarge the size of the fracture formed after the fuse part is blown by setting an elastic component, prevent the circuit from being connected again, and improve the safety performance of the battery.

[0006] In the first aspect, the utility model provides a top cover assembly, including a cover plate, on which a pole is provided; a safety adapter, which is arranged on one side of the cover plate, and the safety adapter includes a pole ear connection part, a pole column connection part and a fuse part, the pole ear connection part is used to be connected to the pole ear of the battery cell, the pole column connection part is used to be connected to the pole column, the fuse part is respectively connected to the pole ear connection part and the pole column connection part, and the fuse part is used to fuse when triggered, so that the pole ear connection part is separated from the pole column connection part and a fracture is formed; an elastic component, which is used to drive one end of the pole ear connection part close to the fuse part or one end of the pole column connection part close to the fuse part to move in a direction away from the cover plate, so that the size of the fracture becomes larger.

[0007] In one embodiment of the present invention, a pressing component is further included, and the pressing component is arranged on a side of the safety adapter away from the elastic component.

[0008] In one embodiment of the utility model, the clamping component and the elastic component are respectively arranged on both sides of the fuse part where the safety adapter is located, and the clamping component and the elastic component are both arranged close to the fuse part; or the clamping component and the elastic component are respectively arranged on both sides of the fuse part where the safety adapter is located, and the clamping component and the elastic component are both arranged away from the fuse part.

[0009] In one embodiment of the utility model, the clamping component and the elastic component are both arranged on the same side of the safety adapter located at the fuse part, and one of the clamping component and the elastic component is arranged close to the fuse part, and the other is arranged away from the fuse part.

[0010] In one embodiment of the utility model, it also includes an insulating component, which is arranged on one side of the cover plate and located between the cover plate and the safety adapter; a folding component, which is connected to the edge of the insulating component and can be folded, and the folded folding component is at least partially located on a side of the safety adapter close to the battery cell; wherein the elastic component is arranged between the insulating component and the safety adapter, or the elastic component is arranged between the folding component and the safety adapter.

[0011] In an embodiment of the present utility model, the pressing component is arranged between the folding component and the safety adapter, and the elastic component is arranged between the insulating component and the safety adapter.

[0012] In an embodiment of the present utility model, the pressing component and the elastic component are both arranged on a side of the fuse portion close to the pole connecting portion, and the elastic component is arranged close to the fuse portion.

[0013] In an embodiment of the present invention, a hollow portion corresponding to the fuse portion is provided on the folding component, and a projection of the hollow portion covers a projection of the fuse portion.

[0014] In a second aspect, the utility model further provides a battery, comprising a top cover assembly as described in any one of the above items.

[0015] In a third aspect, the utility model further provides an electrical device, comprising any one of the batteries described above.

[0016] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0017] The top cover assembly of the utility model provides elastic force for the pole ear connection part or the pole column connection part by setting an elastic component, and expands the size of the fracture after the fuse part is triggered and melted to form a fracture, thereby reducing the possibility of contact between the pole ear connection part and the pole column connection part, preventing the circuit from being connected again, high voltage breakdown causing fire, etc., avoiding safety accidents, and improving the safety performance of the battery. In addition, the elastic elastic component can be compressed. When the fuse part is not triggered and melted, the compressed elastic component will not occupy more space, thereby improving the space utilization rate inside the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0019] Figure 1 This is one of the partial cross-sectional structural schematic diagrams of the top cover assembly in the preferred embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional structural schematic diagram of the insurance adapter in the preferred embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure when the fuse part is blown in the preferred embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the dimensional relationship of the insurance adapter in the preferred embodiment of the utility model;

[0023] Figure 5 This is the second partial cross-sectional structural schematic diagram of the top cover assembly in the preferred embodiment of the utility model;

[0024] Figure 6 This is the third partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0025] Figure 7 This is a fourth partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0026] Figure 8 This is a fifth partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0027] Fig. 9 This is a sixth schematic diagram of a partial cross-sectional structure of a top cover assembly in a preferred embodiment of the utility model;

[0028] Fig.10 This is the seventh partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0029] Fig.11This is the eighth partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0030] Fig.12 This is a ninth partial cross-sectional structural diagram of a top cover assembly in a preferred embodiment of the utility model;

[0031] Fig.13 This is the tenth partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0032] Fig.14 This is the eleventh partial cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model;

[0033] Fig.15 This is a twelfth partial cross-sectional structural diagram of a top cover assembly in a preferred embodiment of the utility model;

[0034] Fig.16 This is a schematic cross-sectional view of the top cover assembly in a preferred embodiment of the utility model;

[0035] Fig.17 It is a schematic diagram of the explosion structure of the battery in the preferred embodiment of the utility model.

[0036] Explanation of the reference numerals in the specification: 10, cover plate; 11, pole; 20, insurance adapter; 21, pole ear connection part; 22, pole connection part; 23, fuse part; 24, fracture; 30, elastic component; 40, pressing component; 51, insulating component; 52, folding component; 53, hollow part. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0038] Reference Figure 1 and Figure 2 As shown, the utility model discloses a top cover assembly, including a cover plate 10 , a safety adapter 20 and an elastic component 30 .

[0039] The cover plate 10 belongs to the prior art, and those skilled in the art can set the material, size, etc. of the cover plate 10 according to actual needs, which will not be described in detail. A pole 11 is provided on the cover plate 10, and the pole 11 is used to connect to an external conductor.

[0040] The safety adapter 20 is arranged on one side of the cover plate 10, and the safety adapter 20 is used to connect the pole 11 and the battery, and cut off the circuit connection when a fault such as a short circuit occurs, resulting in a large current. Specifically, the safety adapter 20 includes a pole lug connection portion 21, a pole post connection portion 22 and a fuse portion 23. Among them, the pole lug connection portion 21 is used to connect to the pole lug of the battery cell. The pole post connection portion 22 is used to connect to the pole 11; preferably, the pole post connection portion 22 is welded to the pole 11. The fuse portion 23 is respectively connected to the pole lug connection portion 21 and the pole post connection portion 22, and the fuse portion 23 is used to fuse when triggered, so that the pole lug connection portion 21 is separated from the pole post connection portion 22, and a break 24 is formed to cut off the current path. Figure 2 and Figure 3 In FIG. 2 , the fracture 24 is indicated by a dotted line.

[0041] A person skilled in the art can set the specific structure of the fuse part 23 according to actual needs. For example, a through hole penetrating the fuse part 23 can be set in the middle area of ​​the fuse part 23, or a notch can be set at the edge of the fuse part 23, so that the fuse part 23 can be triggered to fuse when the current increases, the heat generated by the resistance increases, and the temperature exceeds the preset temperature, thereby forming a break 24 and cutting off the current path.

[0042] Reference Figure 3 and Figure 4 As shown, the elastic component 30 is elastic and is used to drive the end of the pole lug connection part 21 close to the fuse part 23 or the end of the pole connection part 22 close to the fuse part 23 to move away from the cover plate 10, so that the size of the fracture 24 becomes larger. Figure 4 In the figure, the dot-dash line indicates the tab connection portion 21 when the fuse portion 23 is not triggered and fused.

[0043] When the fuse 23 is not triggered and melted, the fuse 23 is connected to the tab connection 21 and the pole connection 22 respectively, so that the insurance adapter 20 can provide a force for the elastic component 30 to offset the elastic force of the elastic component 30. After the fuse 23 is triggered and melted, a fracture 24 is formed, the tab connection 21 is separated from the pole connection 22, and the force provided by the insurance adapter 20 to the elastic component 30 is reduced. After the force balance is broken, the elastic component 30 can provide a force for the corresponding tab connection 21 or pole connection 22, so that the end of the tab connection 21 close to the fuse 23 or the end of the pole connection 22 close to the fuse 23 moves in a direction away from the cover plate 10, so that the size of the fracture 24 becomes larger.

[0044] Those skilled in the art can set the material, shape, size, and specific installation position of the elastic component 30 according to actual needs.

[0045] Reference Figure 5 and Figure 6As shown, in some embodiments, along the arrangement direction of the cover plate 10 and the insurance adapter 20, the elastic component 30 is arranged on the side of the insurance adapter 20 away from the cover plate 10, and at the same time, along the arrangement direction of the pole lug connection part 21, the pole connection part 22 and the fuse part 23, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole lug connection part 21. In some embodiments, along the arrangement direction of the cover plate 10 and the insurance adapter 20, the elastic component 30 is arranged on the side of the insurance adapter 20 away from the cover plate 10, and at the same time, along the arrangement direction of the pole lug connection part 21, the pole connection part 22 and the fuse part 23, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole connection part 22. In some embodiments, along the arrangement direction of the cover plate 10 and the safety adapter 20, the elastic component 30 is arranged on the side of the safety adapter 20 close to the cover plate 10. At the same time, along the arrangement direction of the pole ear connection part 21, the pole connection part 22 and the fuse part 23, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole connection part 22.

[0046] Preferably, refer to Figure 1 As shown, along the arrangement direction of the cover plate 10 and the insurance adapter 20, the elastic component 30 is arranged on the side of the insurance adapter 20 close to the cover plate 10, and at the same time, along the arrangement direction of the pole lug connection part 21, the pole connection part 22 and the fuse part 23, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole lug connection part 21. When a fault such as a short circuit occurs, resulting in a large current, the fuse part 23 of the insurance adapter 20 melts and breaks due to the increase in resistance heat generation and temperature rise, forming a fracture 24, and the force provided by the pole lug connection part 21 to the elastic component 30 is reduced. After the force balance is broken, the elastic component 30 can provide a force for the corresponding pole lug connection part 21, so that the end of the pole lug connection part 21 close to the fuse part 23 moves in the direction away from the cover plate 10, so that the size of the fracture 24 becomes larger. First, under the premise of cutting off the circuit connection, the elastic component 30 can expand the size of the fracture 24, reduce the possibility of contact between the pole ear connection part 21 and the pole column connection part 22, prevent the circuit from being connected again, high voltage breakdown causing fire, etc., avoid causing safety accidents, and improve the safety performance of the battery. Secondly, because the elastic component 30 is arranged on the side of the fuse part 23 close to the pole ear connection part 21, the relatively smaller connection force at the pole ear connection part 21 is fully utilized, and the elastic force requirement for the elastic component 30 is relatively small. Finally, the elastic component 30 is arranged on the side of the insurance adapter 20 close to the cover plate 10, which can make the insurance adapter 20 have a larger moving space.

[0047] The top cover assembly of the utility model provides elastic force for the pole ear connection part 21 or the pole column connection part 22 by setting an elastic component 30, and expands the size of the fracture 24 after the fuse part 23 is triggered and melted to form the fracture 24, thereby reducing the possibility of contact between the pole ear connection part 21 and the pole column connection part 22, preventing the circuit from being connected again, high voltage breakdown causing fire, etc., avoiding safety accidents, and improving the safety performance of the battery. In addition, the elastic component 30 with elasticity can be compressed. When the fuse part 23 is not triggered and melted, the compressed elastic component 30 will not occupy more space, thereby improving the space utilization rate inside the battery.

[0048] Reference Figure 7 As shown, the top cover assembly described in the utility model, in some embodiments, further includes a clamping component 40. Along the arrangement direction of the cover plate 10 and the safety adapter 20, the clamping component 40 is arranged on the side of the safety adapter 20 away from the elastic component 30. The clamping component 40 is used to abut and clamp the corresponding part of the safety adapter 20. By providing the clamping component 40, on the one hand, a certain force can be provided to the safety adapter 20 to ensure that the safety adapter 20 can compress the elastic component 30 when its fuse part 23 is not triggered and blown; on the other hand, when the fuse part 23 is triggered and blown, the clamping component 40 can also provide a certain force to the corresponding part of the safety adapter 20, drive its relative movement, and further expand the size of the fracture 24, thereby improving the safety performance of the battery.

[0049] Further, in some embodiments, along the arrangement direction of the tab connection part 21, the pole connection part 22 and the fuse part 23, the pressing component 40 and the elastic component 30 are respectively arranged on both sides of the fuse part 23 of the insurance adapter 20, and the pressing component 40 and the elastic component 30 are both arranged close to the fuse part 23. By setting this structure, when the fuse part 23 is triggered and fused, under the action of the elastic component 30 and the pressing component 40, the tab connection part 21 and the pole connection part 22 can move in different directions, further expanding the size of the fracture 24, thereby improving the safety performance of the battery.

[0050] Specifically, refer to Figure 7 As shown, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole lug connection part 21, and the pressing component 40 is arranged on the side of the fuse part 23 close to the pole connection part 22. Figure 8 As shown, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole connection part 22, and the pressing component 40 is arranged on the side of the fuse part 23 close to the pole lug connection part 21. In some embodiments, along the arrangement direction of the pole lug connection part 21, the pole connection part 22 and the fuse part 23, the pressing component 40 and the elastic component 30 are respectively arranged on both sides of the insurance adapter 20 located at the fuse part 23, and the pressing component 40 and the elastic component 30 are both arranged away from the fuse part 23. Fig. 9 As shown, the elastic component 30 is arranged on the side of the fuse part 23 close to the pole lug connecting part 21 , and the pressing component 40 is arranged on the side of the fuse part 23 close to the pole connecting part 22 .

[0051] Further, in some embodiments, along the arrangement direction of the tab connection part 21, the pole connection part 22 and the fuse part 23, the pressing component 40 and the elastic component 30 are both arranged on the same side of the fuse part 23 of the insurance adapter 20, and one of the pressing component 40 and the elastic component 30 is arranged close to the fuse part 23, and the other is arranged away from the fuse part 23. By setting this structure, when the fuse part 23 is triggered and fused, under the action of the elastic component 30 and the pressing component 40, the two ends of the tab connection part 21 or the two ends of the pole connection part 22 can move in different directions, further expanding the size of the fracture 24, thereby improving the safety performance of the battery.

[0052] Specifically, refer to Fig.10 As shown, the pressing component 40 and the elastic component 30 are both arranged on one side of the tab connection portion 21, wherein the elastic component 30 is arranged between the tab connection portion 21 and the cover plate 10, and the elastic component 30 is arranged close to the fuse portion 23; this structure can effectively reduce the demand for the elastic force of the elastic component 30. Fig.11 As shown, the pressing component 40 and the elastic component 30 are both arranged on one side of the tab connection portion 21, wherein the pressing component 40 is arranged between the tab connection portion 21 and the cover plate 10, and the pressing component 40 is arranged close to the fuse portion 23. Fig.12 As shown, the pressing component 40 and the elastic component 30 are both arranged on one side of the pole connecting portion 22, wherein the elastic component 30 is arranged between the pole lug connecting portion 21 and the cover plate 10, and the elastic component 30 is arranged close to the fuse portion 23. Fig.13 As shown, the pressing component 40 and the elastic component 30 are both arranged on one side of the pole connecting portion 22 , wherein the pressing component 40 is arranged between the pole lug connecting portion 21 and the cover plate 10 , and the pressing component 40 is arranged close to the fuse 23 .

[0053] Reference Fig.14As shown, the top cover assembly described in the utility model, in some embodiments, further includes an insulating component 51 and a folding component 52. The insulating component 51 is arranged on one side of the cover plate 10, and the insulating component 51 is located between the cover plate 10 and the safety adapter 20. The folding component 52 is connected to the edge of the insulating component 51, and the folding component 52 can be folded, and the folded folding component 52 is at least partially located on the side of the safety adapter 20 close to the battery cell. Preferably, the insulating component 51 and the folding component 52 are both made of plastic material, which can play an insulating effect. Among them, the elastic component 30 is arranged between the insulating component 51 and the safety adapter 20, or the elastic component 30 is arranged between the folding component 52 and the safety adapter 20. When the fuse 23 is not triggered and blown, the elastic component 30 is compressed under the force of the folding component 52 and the safety adapter 20, or the insulating component 51 and the safety adapter 20; when the fuse 23 is triggered and blown, the force of the safety adapter 20 on the elastic component 30 becomes smaller, and the elastic component 30 recovers and expands the size of the fracture 24. Preferably, a groove corresponding to the elastic component 30 is provided on the insulating component 51 or the folding component 52, and the elastic component 30 is arranged in the groove. Preferably, the elastic component 30 and the folding component 52, or the elastic component 30 and the insulating component 51 are overmolded. Those skilled in the art can set the way in which the folding component 52 is connected to the insulating component 51 according to actual needs, for example, the two are an integrated structure, or the two are detachably connected, such as being connected by a snap-on structure.

[0054] Further, see Fig.14 As shown, in some embodiments, when the insulating component 51, the folding component 52 and the pressing component 40 are provided at the same time, the pressing component 40 is provided between the folding component 52 and the safety adapter 20, and the elastic component 30 is provided between the insulating component 51 and the safety adapter 20. When the fuse 23 is not triggered and fused, the elastic component 30 is clamped by the insulating component 51 and the safety adapter 20, and the pressing component 40 and the folding component 52 provide a force for the safety adapter 20. Preferably, the pressing component 40 and the folding component 52 are integrally injection molded. Those skilled in the art can set the specific size, position, etc. of the elastic component 30 and the pressing component 40 according to actual needs, which will not be repeated.

[0055] Preferably, refer to Fig.15As shown, along the arrangement direction of the pole lug connection part 21, the pole connection part 22 and the fuse part 23, the pressing component 40 and the elastic component 30 are both arranged on the side of the fuse part 23 close to the pole connection part 22, and the elastic component 30 is arranged close to the fuse part 23. Compared with the pole lug connection part 21, the relative positions of the pole connection part 22 and the pole 11 are relatively fixed. When the elastic component 30 and the pressing component 40 are arranged on the side of the fuse part 23 close to the pole connection part 22, frequent adjustment is not required. Of course, the positions of the elastic component 30 and the pressing component 40 are not limited. In other embodiments, the positions of the two can also be adjusted accordingly according to actual needs.

[0056] Preferably, refer to Fig.14 and Fig.15 As shown, a hollow portion 53 corresponding to the fuse 23 is provided on the folding component 52, and the projection of the hollow portion 53 covers the projection of the fuse 23. Preferably, the projection of the hollow portion 53 on the cover plate 10 covers the projection of the fuse 23 on the cover plate 10. By setting this structure, when the fuse 23 is triggered and fused, the corresponding part of the insurance adapter 20 is convenient to pop out of the folding component 52 from the hollow portion 53 under the action of the elastic component 30, so as to avoid being blocked by the folding component 52, and ensure that the size of the fracture 24 can be fully expanded, thereby reducing the possibility of contact between the pole ear connection part 21 and the pole connection part 22, preventing the circuit from being connected again, high voltage breakdown causing fire, etc., avoiding safety accidents, and improving the safety performance of the battery.

[0057] Reference Fig.16 and Fig.17 As shown, the utility model discloses a battery, including the top cover assembly described in any one of the above embodiments. Since the battery of the utility model includes the top cover assembly described in the above embodiments, the battery also has all the beneficial effects, which will not be described in detail.

[0058] The utility model discloses an electric device, including the battery described in any one of the above embodiments. Since the electric device described in the utility model includes the battery described in the above embodiments, the electric device also has all the beneficial effects, which will not be described in detail. Since the main design point of the utility model is the top cover assembly, other structures of the electric device, such as the electrical connection part and the mechanical structure part of the electric device, will not be described in detail.

[0059] Electrical equipment may be automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Automobiles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present invention do not impose any special restrictions on the above-mentioned electrical equipment.

[0060] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A top cover assembly, characterized in that: include: A cover plate (10), wherein a pole (11) is provided on the cover plate (10); A safety adapter (20), the safety adapter (20) being arranged on one side of the cover plate (10), the safety adapter (20) comprising a pole ear connection portion (21), a pole column connection portion (22) and a fuse portion (23), the pole ear connection portion (21) being used to be connected to a pole ear of a battery cell, the pole column connection portion (22) being used to be connected to the pole column (11), the fuse portion (23) being connected to the pole ear connection portion (21) and the pole column connection portion (22) respectively, the fuse portion (23) being used to fuse when triggered, so that the pole ear connection portion (21) is separated from the pole column connection portion (22), and a fracture (24) is formed; An elastic component (30) is used to drive one end of the pole lug connection portion (21) close to the fuse portion (23) or one end of the pole connection portion (22) close to the fuse portion (23) to move in a direction away from the cover plate (10), so that the size of the fracture (24) becomes larger.

2. The top cover assembly according to claim 1, characterized in that: It also comprises a pressing component (40), wherein the pressing component (40) is arranged on a side of the safety adapter (20) away from the elastic component (30).

3. The top cover assembly according to claim 2, characterized in that: The pressing component (40) and the elastic component (30) are respectively arranged on both sides of the fuse part (23) of the safety adapter (20), and the pressing component (40) and the elastic component (30) are both arranged close to the fuse part (23); or The pressing component (40) and the elastic component (30) are respectively arranged on both sides of the fuse part (23) of the safety adapter (20), and the pressing component (40) and the elastic component (30) are both arranged away from the fuse part (23).

4. The top cover assembly according to claim 2, characterized in that: The pressing component (40) and the elastic component (30) are both arranged on the same side of the fuse part (23) of the safety adapter (20), and one of the pressing component (40) and the elastic component (30) is arranged close to the fuse part (23), and the other is arranged away from the fuse part (23).

5. The top cover assembly according to any one of claims 1 to 4, characterized in that: Also includes: An insulating component (51), wherein the insulating component (51) is arranged on one side of the cover plate (10), and the insulating component (51) is located between the cover plate (10) and the safety adapter (20); A folding component (52), the folding component (52) being connected to an edge of the insulating component (51), the folding component (52) being capable of being folded, and the folded folding component (52) being at least partially located on a side of the safety adapter (20) close to the battery core; Wherein, the elastic component (30) is arranged between the insulating component (51) and the safety adapter (20), or the elastic component (30) is arranged between the folding component (52) and the safety adapter (20).

6. The top cover assembly according to claim 5, characterized in that: The pressing component (40) is arranged between the folding component (52) and the safety adapter (20), and the elastic component (30) is arranged between the insulating component (51) and the safety adapter (20).

7. The top cover assembly according to claim 6, characterized in that: The pressing component (40) and the elastic component (30) are both arranged on a side of the fuse part (23) close to the pole connecting part (22), and the elastic component (30) is arranged close to the fuse part (23).

8. The top cover assembly according to claim 5, characterized in that: The folding component (52) is provided with a hollow portion (53) corresponding to the fuse portion (23), and the projection of the hollow portion (53) covers the projection of the fuse portion (23).

9. A battery, characterized in that: Comprising a top cover assembly as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.

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