A top cover assembly, a battery, a battery module, a battery pack, and a power utilization device

Abstract

This utility model provides a top cover assembly, a battery, a battery module, a battery pack, and an electrical device. It includes a top cover and a connecting piece, with a connecting hole on the top cover. The connecting piece includes a terminal post, a first connecting part, and a second connecting part. The terminal post passes through the connecting hole and connects between the first and second connecting parts. Using this battery module and electrical device, the same connecting piece can function as both a terminal post connecting a tab and connecting another individual battery cell, thus reducing the number of parts in the top cover assembly and facilitating assembly. The terminal post passes through the connecting hole so that the first and second connecting parts are located on opposite sides of the connecting hole, enabling quick connection between the connecting piece and the top cover. The second connecting part extends along the surface of the top cover and connects to the tab, increasing the connection area between the second connecting part and the tab while reducing the space occupied inside the battery, thereby increasing battery capacity.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly, a battery, a battery module, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, the top cover assembly includes connecting pieces and terminals, which connect two adjacent batteries. Due to the large number of components in the top cover assembly, there are problems with complicated assembly during actual production, and it occupies a lot of internal space of the battery, which is not conducive to practicality. Utility Model Content

[0003] The embodiments of this utility model provide a top cover assembly, a battery, a battery module, a battery pack, and an electrical device, which can improve the technical problems of cumbersome assembly and occupying a lot of internal battery space.

[0004] In a first aspect, embodiments of the present invention provide a top cover assembly, comprising:

[0005] Top cover, wherein the top cover is provided with a connecting hole; and,

[0006] The connecting piece includes a terminal post, a first connecting part, and a second connecting part. The terminal post passes through the connecting hole and is connected between the first connecting part and the second connecting part, such that the first connecting part and the second connecting part are located on both sides of the connecting hole. The first connecting part is used to connect another single battery cell, and the second connecting part extends along the surface of the top cover and is used to connect a tab.

[0007] In one embodiment, the first connecting portion extends along the length direction of the top cover; and / or, the second connecting portion extends along the length direction of the top cover.

[0008] In one embodiment, the ratio of the length of the first connecting portion to the length of the top cover is greater than or equal to 0.1 and less than or equal to 0.2.

[0009] In one embodiment, the side of the top cover facing away from the battery cell is spaced apart from the first connection portion to provide insulation between the first connection portion and the top cover; and / or,

[0010] The top cover is spaced apart from the second connection portion on the side closest to the battery cell to provide insulation between the second connection portion and the top cover.

[0011] In one embodiment, when the side of the top cover facing away from the battery cell is spaced apart from the first connecting portion, the minimum distance between the first connecting portion and the top cover is greater than or equal to 0.4 mm and less than or equal to 0.8 mm; and / or,

[0012] When the top cover is spaced apart from the second connecting part on the side closest to the battery cell, the minimum distance between the second connecting part and the top cover is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0013] In one embodiment, the top cover assembly further includes a first insulating member, with at least a portion of the connecting piece passing through the first insulating member for insulation between the side of the top cover away from the battery cell and the connecting piece.

[0014] In one embodiment, at least a portion of the pole post passes through the first insulating member, the first insulating member including a first insulating portion and a first sealing portion, the first insulating portion being disposed between the first connecting portion and the top cover, and the first sealing portion being disposed between the inner circumferential surface of the connecting hole and the pole post.

[0015] In one embodiment, the first insulating portion and the first sealing portion are integrally formed; and / or, the first insulating member is an adhesive member for bonding and fixing the top cover to the connecting piece.

[0016] In one embodiment, the top cover assembly further includes a second insulating member, through which at least a portion of the connecting piece passes for insulation between the top cover and the connecting piece on the side of the top cover closest to the battery cell.

[0017] In one embodiment, at least a portion of the pole post passes through the second insulating member, the second insulating member including a second insulating portion and a second sealing portion, the second insulating portion being disposed between the second connecting portion and the top cover, and the second sealing portion being disposed between the inner circumferential surface of the connecting hole and the pole post.

[0018] In one embodiment, the second insulating portion and the second sealing portion are integrally formed; and / or,

[0019] The second insulating component is an adhesive component used to bond and fix the top cover to the connecting piece.

[0020] In one embodiment, the top cover assembly further includes a sealing ring disposed between the first insulating member and the second insulating member, and the sealing ring is disposed between the inner peripheral surface of the connecting hole and the pole portion.

[0021] Secondly, embodiments of the present invention provide a battery, including a housing and the aforementioned top cover assembly. The housing has a mounting cavity and an opening communicating with the mounting cavity, and the top cover assembly is connected to the opening to close the opening.

[0022] Thirdly, embodiments of this utility model provide a battery module, including the battery described above.

[0023] Fourthly, embodiments of this utility model provide a battery pack including the aforementioned battery module.

[0024] Fifthly, embodiments of the present invention provide an electrical device, including the aforementioned battery, battery module, or battery pack.

[0025] The beneficial effects of the embodiments of this utility model are as follows:

[0026] Because the connecting piece includes a terminal post, a first connecting part, and a second connecting part, it can function as both a terminal post connecting to a tab and a connecting part to another single battery cell, thereby reducing the number of parts in the top cover assembly and facilitating assembly. Furthermore, the terminal post passes through the connecting hole, so that the first connecting part and the second connecting part are located on opposite sides of the connecting hole, enabling quick connection between the connecting piece and the top cover. In addition, the second connecting part extends along the surface of the top cover and is used to connect to the tab, which increases the connection area between the second connecting part and the tab, while also reducing the space occupied inside the battery, thereby increasing the battery capacity. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the top cover assembly provided in an embodiment of the present invention;

[0029] Figure 2 This is an exploded view of the top cover assembly provided in an embodiment of this utility model;

[0030] Figure 3 yes Figure 1 The diagram shows the structure of the connecting piece in the top cover assembly.

[0031] Figure 4 This is a partial cross-sectional view of the top cover assembly provided in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the battery module provided in an embodiment of the present invention.

[0033] Marked in the image:

[0034] 1. Top cover assembly;

[0035] 100. Top cover; 101. Connecting hole;

[0036] 200. Connecting piece; 201. Pole post; 202. First connecting part; 203. Second connecting part;

[0037] 300. First insulating element; 301. First insulating part; 302. First sealing part;

[0038] 400. Second insulating component; 401. Second insulating part; 402. Second sealing part;

[0039] 500, sealing ring;

[0040] 2. Battery;

[0041] 600. Shell. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] Reference Figures 1 to 3 As shown, this utility model embodiment provides a top cover assembly 1, including a top cover 100 and a connecting piece 200. The top cover 100 is provided with a connecting hole 101. The connecting piece 200 includes a terminal post 201, a first connecting part 202 and a second connecting part 203. The terminal post 201 passes through the connecting hole 101 and is connected between the first connecting part 202 and the second connecting part 203, such that the first connecting part 202 and the second connecting part 203 are respectively located on both sides of the connecting hole 101. The first connecting part 202 is used to connect another single battery cell, and the second connecting part 203 extends along the surface of the top cover 100 and is used to connect a tab.

[0044] Since the connecting piece 200 includes a terminal post 201, a first connecting part 202, and a second connecting part 203, it can serve as both a terminal post for connecting tabs and a connecting part for connecting another single battery cell, thereby reducing the number of parts in the top cover assembly 1 and facilitating assembly. Furthermore, the terminal post 201 passes through the connecting hole 101, so that the first connecting part 202 and the second connecting part 203 are located on both sides of the connecting hole 101, thereby enabling quick connection between the connecting piece 200 and the top cover 100. In addition, the second connecting part 203 extends along the surface of the top cover 100 and is used to connect tabs, which increases the connection area between the second connecting part 203 and the tabs and reduces the space occupied inside the battery, thereby increasing the battery capacity.

[0045] It should also be noted that in this embodiment, the connecting piece 200 passes through the top cover 100 by bending, thereby achieving a quick connection with the top cover 100.

[0046] It is understood that in this embodiment, there are two connecting pieces 200, and the two connecting pieces 200 are spaced apart along the length of the top cover 100 to connect the positive and negative tabs of the battery cell. Correspondingly, there are also two connecting holes 101 to connect to the two connecting pieces 200 one by one.

[0047] In some embodiments, refer to Figure 1 and Figure 2 As shown, the first connecting part 202 extends along the length direction of the top cover 100.

[0048] The first connecting portion 202 extends along the length of the top cover 100. On the one hand, it can increase the connection area between the first connecting portion 202 and the single battery cell, thereby ensuring the connection between the first connecting portion 202 and the other single battery cell. On the other hand, it can increase the external space of the battery, thereby increasing the battery capacity.

[0049] In some embodiments, refer to Figure 1 and Figure 2 As shown, the second connecting part 203 extends along the length direction of the top cover 100.

[0050] The second connecting part 203 extends along the length of the top cover 100. On the one hand, it can increase the connection area between the second connecting part 203 and the electrode tab, thereby ensuring the connection between the second connecting part 203 and the electrode tab. On the other hand, it can increase the internal space of the battery, thereby increasing the battery capacity.

[0051] In some embodiments, refer to Figure 1 and Figure 2As shown, the first connecting part 202 extends along the length direction of the top cover 100, and the second connecting part 203 extends along the length direction of the top cover 100.

[0052] Since the first connecting part 202 and the second connecting part 203 both extend in the same direction, when the connecting piece 200 passes through the top cover 100 piece in the form of bending, the first connecting piece 200 and the second connecting piece 200 can be quickly connected to the top cover 100 piece, achieving the effect of rapid assembly.

[0053] In some embodiments, refer to Figure 1 As shown, the ratio of the length of the first connecting part 202 to the length of the top cover 100 is greater than or equal to 0.1 and less than or equal to 0.2.

[0054] In this embodiment, the lengths of the first connector and the top cover 100 are limited to the above-mentioned range. This ensures that the length of the first connecting piece 200 is sufficient, thereby increasing the connection area between the first connecting piece 200 and the single battery cell to ensure the connection between the first connecting piece 200 and the single battery cell. At the same time, it avoids the first connecting part 202 from being too long, thereby avoiding the waste of external space of the battery, ensuring battery capacity, and reducing the overall weight of the top cover assembly 1.

[0055] In some embodiments, the side of the top cover 100 facing away from the battery cell is spaced apart from the first connection portion 202 for insulation between the first connection portion 202 and the top cover 100.

[0056] By spacing the first connecting part 202 from the top cover 100, insulation between the first connecting part 202 and the top cover 100 can be achieved, thereby preventing another single battery cell from being directly connected to the top cover 100 and preventing short circuits in the battery.

[0057] In some embodiments, the top cover 100 is spaced apart from the second connection portion 203 on the side near the battery cell to provide insulation between the second connection portion 203 and the top cover 100.

[0058] By spacing the second connecting part 203 from the top cover 100, insulation between the second connecting part 203 and the top cover 100 can be achieved, thereby preventing another single battery cell from being directly connected to the top cover 100 and preventing short circuits in the battery.

[0059] In some embodiments, when the top cover 100 is spaced apart from the first connection portion 202 on the side opposite to the battery cell, the minimum distance between the first connection portion 202 and the top cover 100 is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0060] In this embodiment, the distance between the first connecting part 202 and the top cover 100 is 0.6 mm.

[0061] However, this design is not limited to this. In other embodiments, the distance between the first connecting part 202 and the top cover 100 is 0.4mm, 0.5mm, 0.7mm, or 0.8mm.

[0062] By limiting the distance between the first connecting part 202 and the top cover 100 to the above range, it is possible to ensure that the distance between the first connecting part 202 and the top cover 100 is sufficient to avoid short circuits, and also to prevent the distance between the first connecting part 202 and the top cover 100 from being too large, thereby avoiding occupying too much external space of the battery.

[0063] In some embodiments, when the top cover 100 is spaced apart from the second connection portion 203 on the side near the battery cell, the minimum distance between the second connection portion 203 and the top cover 100 is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0064] In this embodiment, the distance between the second connecting part 203 and the top cover 100 is 0.6 mm.

[0065] However, this design is not limited to this. In other embodiments, the distance between the second connecting part 203 and the top cover 100 is 0.4mm, 0.5mm, 0.7mm, or 0.8mm.

[0066] By limiting the distance between the second connecting part 203 and the top cover 100 within the aforementioned range, it is possible to ensure that the distance between the second connecting part 203 and the top cover 100 is sufficient to avoid short circuits, while also preventing the distance between the second connecting part 203 and the top cover 100 from being too large, thereby avoiding occupying too much external space of the battery.

[0067] In some embodiments, refer to Figure 1 , Figure 2 and Figure 4 As shown, the top cover assembly 1 also includes a first insulating member 300, and at least a portion of the connecting piece 200 passes through the first insulating member 300 for insulation between the side of the top cover 100 away from the battery cell and the connecting piece 200.

[0068] Therefore, the occurrence of short circuits between the connecting piece 200 and the top cover 100 can be reduced, ensuring the safety of battery use.

[0069] In some embodiments, refer to Figure 4 As shown, at least a portion of the pole post 201 passes through the first insulating member 300. The first insulating member 300 includes a first insulating portion 301 and a first sealing portion 302. The first insulating portion 301 is disposed between the first connecting portion 202 and the top cover 100, and the first sealing portion 302 is disposed between the inner circumferential surface of the connecting hole 101 and the pole post 201.

[0070] Accordingly, the first insulating part 301 can ensure the insulation between the first connecting part 202 and the top cover 100, and the first sealing part 302 can ensure the insulation between the connecting hole 101 and the pole part 201. The first insulating part 301 and the first sealing part 302 complement each other and jointly achieve the insulation between the side of the top cover 100 away from the battery cell and the connecting piece 200 to prevent short circuit.

[0071] In some embodiments, the first insulating portion 301 and the first sealing portion 302 are integrally formed.

[0072] Thus, the integral molding of the first insulating part 301 and the first sealing part 302 reduces complex process steps such as welding, bonding, or assembly, thereby lowering manufacturing difficulty and cost. At the same time, it reduces quality problems caused by process defects (such as weak bonding or poor welding).

[0073] In addition, the one-piece molded first insulating component 300 can be produced directly, reducing subsequent assembly processes, improving production efficiency, and shortening the production cycle.

[0074] In one example, the material of the first insulating member 300 may be, but is not limited to, plastic. In one example, the materials of the first insulating portion 301 and the first sealing portion 302 may be the same or different.

[0075] In some embodiments, the first insulating member 300 is an adhesive member used to bond and fix the top cover 100 to the connecting piece 200.

[0076] Accordingly, the first insulating component 300 not only serves as an insulator, but also achieves the effect of bonding and fixing the top cover 100 and the connecting piece 200, thereby ensuring the insulating connection and fixing effect between the top cover 100 and the connecting piece 200.

[0077] In some embodiments, refer to Figure 1 , Figure 2 and Figure 4 As shown, the top cover assembly 1 also includes a second insulating member 400, with at least a portion of the connecting piece 200 passing through the second insulating member 400 for insulation between the top cover 100 and the connecting piece 200 on the side of the top cover 100 near the battery cell.

[0078] Therefore, the occurrence of short circuits between the connecting piece 200 and the top cover 100 can be reduced, ensuring the safety of battery use.

[0079] In some embodiments, refer to Figure 4 As shown, at least a portion of the pole post 201 passes through the second insulating member 400. The second insulating member 400 includes a second insulating portion 401 and a second sealing portion 402. The second insulating portion 401 is disposed between the second connecting portion 203 and the top cover 100, and the second sealing portion 402 is disposed between the inner circumferential surface of the connecting hole 101 and the pole post 201.

[0080] Accordingly, the second insulating part 401 can ensure the insulation between the second connecting part 203 and the top cover 100, and the second sealing part 402 can ensure the insulation between the connecting hole 101 and the pole part 201. The second insulating part 401 and the second sealing part 402 complement each other to jointly achieve the insulation between the side of the top cover 100 near the battery cell and the connecting piece 200, preventing short circuit.

[0081] In some embodiments, the second insulating portion 401 and the second sealing portion 402 are integrally formed.

[0082] Thus, the integral molding of the second insulating part 401 and the second sealing part 402 reduces complex process steps such as welding, bonding, or assembly, thereby lowering manufacturing difficulty and cost. At the same time, it reduces quality problems caused by process defects (such as weak bonding or poor welding).

[0083] In addition, the one-piece molded second insulating component 400 can be produced directly, reducing subsequent assembly processes, improving production efficiency, and shortening the production cycle.

[0084] In one example, the material of the second insulating member 400 may be, but is not limited to, plastic. In one example, the materials of the second insulating portion 401 and the second sealing portion 402 may be the same or different.

[0085] In some embodiments, the second insulating member 400 is an adhesive member used to bond and fix the top cover 100 to the connecting piece 200.

[0086] Accordingly, the second insulating component 400 not only serves as an insulator, but also achieves the effect of bonding and fixing the top cover 100 and the connecting piece 200, thereby ensuring the insulating connection and fixing effect between the top cover 100 and the connecting piece 200.

[0087] In some embodiments, the top cover assembly 1 further includes a sealing ring 500, which is disposed between the first insulating member 300 and the second insulating member 400, and is disposed between the inner peripheral surface of the connecting hole 101 and the pole post 201.

[0088] In this way, impurities are reduced from entering the inner surface of the top cover 100 through the connection hole 101 from the outer surface of the top cover 100.

[0089] In one embodiment, a first sealing ring 500 is disposed between a first insulating member 300 and a second insulating member 400 in the height direction of the top cover 100. This helps to improve the sealing performance of the connection hole 101.

[0090] Secondly, referring to Figure 5As shown, this utility model embodiment also provides a battery 2, which includes a housing 600 and a top cover assembly 1 as described above. The housing 600 is provided with a mounting cavity and an opening communicating with the mounting cavity. The top cover assembly 1 is connected to the opening to close the opening.

[0091] The battery 2 has all the beneficial effects of the aforementioned top cover assembly 1:

[0092] Since the connecting piece 200 includes a terminal post 201, a first connecting part 202, and a second connecting part 203, it can serve as both a terminal post for connecting tabs and a connecting part for connecting another single battery cell, thereby reducing the number of parts in the top cover assembly 1 and facilitating assembly. Furthermore, the terminal post 201 passes through the connecting hole 101, so that the first connecting part 202 and the second connecting part 203 are located on both sides of the connecting hole 101, thereby enabling quick connection between the connecting piece 200 and the top cover 100. In addition, the second connecting part 203 extends along the surface of the top cover 100 and is used to connect tabs, which increases the connection area between the second connecting part 203 and the tabs and reduces the space occupied inside the battery, thereby increasing the battery capacity.

[0093] Thirdly, this utility model embodiment also provides a battery module, which includes the battery described above.

[0094] This battery module has all the beneficial effects of battery 2 mentioned above:

[0095] Since the connecting piece 200 includes a terminal post 201, a first connecting part 202, and a second connecting part 203, it can serve as both a terminal post for connecting tabs and a connecting part for connecting another single battery cell, thereby reducing the number of parts in the top cover assembly 1 and facilitating assembly. Furthermore, the terminal post 201 passes through the connecting hole 101, so that the first connecting part 202 and the second connecting part 203 are located on both sides of the connecting hole 101, thereby enabling quick connection between the connecting piece 200 and the top cover 100. In addition, the second connecting part 203 extends along the surface of the top cover 100 and is used to connect tabs, which increases the connection area between the second connecting part 203 and the tabs and reduces the space occupied inside the battery, thereby increasing the battery capacity.

[0096] Fourthly, this utility model embodiment also provides a battery pack, which includes the battery module described above.

[0097] This battery pack possesses all the beneficial effects of the aforementioned battery module:

[0098] Since the connecting piece 200 includes a terminal post 201, a first connecting part 202, and a second connecting part 203, it can serve as both a terminal post for connecting tabs and a connecting part for connecting another single battery cell, thereby reducing the number of parts in the top cover assembly 1 and facilitating assembly. Furthermore, the terminal post 201 passes through the connecting hole 101, so that the first connecting part 202 and the second connecting part 203 are located on both sides of the connecting hole 101, thereby enabling quick connection between the connecting piece 200 and the top cover 100. In addition, the second connecting part 203 extends along the surface of the top cover 100 and is used to connect tabs, which increases the connection area between the second connecting part 203 and the tabs and reduces the space occupied inside the battery, thereby increasing the battery capacity.

[0099] Fifthly, this utility model embodiment also provides an electrical device, which includes the battery 2 described above, the battery module described above, or the battery pack described above.

[0100] The electrical equipment has all the beneficial effects of the aforementioned battery 2, battery module, or battery pack:

[0101] Since the connecting piece 200 includes a terminal post 201, a first connecting part 202, and a second connecting part 203, it can serve as both a terminal post for connecting tabs and a connecting part for connecting another single battery cell, thereby reducing the number of parts in the top cover assembly 1 and facilitating assembly. Furthermore, the terminal post 201 passes through the connecting hole 101, so that the first connecting part 202 and the second connecting part 203 are located on both sides of the connecting hole 101, thereby enabling quick connection between the connecting piece 200 and the top cover 100. In addition, the second connecting part 203 extends along the surface of the top cover 100 and is used to connect tabs, which increases the connection area between the second connecting part 203 and the tabs and reduces the space occupied inside the battery, thereby increasing the battery capacity.

[0102] Electrical equipment can include, but is not limited to, vehicles, smart wearable devices, mobile terminals, home appliances, and medical devices; this application does not limit the scope of these categories. Vehicles include, but are not limited to, cars, buses, trains, ships, and aircraft. Smart wearable devices include, but are not limited to, smartwatches, smart bracelets, and neck massagers. Mobile terminals include, but are not limited to, smartphones, laptops, tablets, and POS (point-of-sales) machines. Home appliances include, but are not limited to, televisions, washing machines, air conditioners, rice cookers, smart robot vacuums, and smart lights. Medical devices include, but are not limited to, infrared electronic thermometers, pulse oximeters, and body composition analyzers.

[0103] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover assembly, characterized in that, include: A top cover (100), wherein the top cover (100) is provided with a connecting hole (101); and, A connecting piece (200) includes a terminal post (201), a first connecting part (202), and a second connecting part (203). The terminal post (201) passes through the connecting hole (101) and is connected between the first connecting part (202) and the second connecting part (203), such that the first connecting part (202) and the second connecting part (203) are located on both sides of the connecting hole (101). The first connecting part (202) is used to connect another single battery cell, and the second connecting part (203) extends along the surface of the top cover (100) and is used to connect a tab.

2. The top cover assembly according to claim 1, characterized in that, The first connecting portion (202) extends along the length direction of the top cover (100); and / or, The second connecting portion (203) extends along the length direction of the top cover (100).

3. The top cover assembly according to claim 1, characterized in that, The ratio of the length of the first connecting part (202) to the length of the top cover (100) is greater than or equal to 0.1 and less than or equal to 0.

2.

4. The top cover assembly according to claim 1, characterized in that, The top cover (100) is spaced apart from the first connecting portion (202) on the side opposite to the battery cell, for insulation between the first connecting portion (202) and the top cover (100); and / or, The top cover (100) is spaced apart from the second connection portion (203) on the side near the battery cell to provide insulation between the second connection portion (203) and the top cover (100).

5. The top cover assembly according to claim 4, characterized in that, When the top cover (100) is spaced apart from the first connecting part (202) on the side opposite to the battery cell, the minimum distance between the first connecting part (202) and the top cover (100) is greater than or equal to 0.4 mm and less than or equal to 0.8 mm; and / or, When the top cover (100) is spaced apart from the second connecting part (203) on the side near the battery cell, the minimum distance between the second connecting part (203) and the top cover (100) is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

6. The top cover assembly according to any one of claims 1-5, characterized in that, The top cover assembly (1) further includes a first insulating member (300), at least a portion of the connecting piece (200) passing through the first insulating member (300) for insulation between the side of the top cover (100) away from the battery cell and the connecting piece (200).

7. The top cover assembly according to claim 6, characterized in that, At least a portion of the pole post (201) passes through the first insulating member (300). The first insulating member (300) includes a first insulating part (301) and a first sealing part (302). The first insulating part (301) is disposed between the first connecting part (202) and the top cover (100). The first sealing part (302) is disposed between the inner circumferential surface of the connecting hole (101) and the pole post (201).

8. The top cover assembly according to claim 7, characterized in that, The first insulating part (301) and the first sealing part (302) are integrally formed; and / or, The first insulating member (300) is an adhesive member used to bond and fix the top cover (100) to the connecting piece (200).

9. The top cover assembly according to claim 6, characterized in that, The top cover assembly (1) further includes a second insulating member (400), through which at least a portion of the connecting piece (200) passes for insulation between the top cover (100) and the connecting piece (200) on the side of the battery cell.

10. The top cover assembly according to claim 9, characterized in that, At least a portion of the pole post (201) passes through the second insulating member (400), the second insulating member (400) includes a second insulating part (401) and a second sealing part (402), the second insulating part (401) is disposed between the second connecting part (203) and the top cover (100), and the second sealing part (402) is disposed between the inner circumferential surface of the connecting hole (101) and the pole post (201).

11. The top cover assembly according to claim 10, characterized in that, The second insulating part (401) and the second sealing part (402) are integrally formed; and / or, The second insulating member (400) is an adhesive member used to bond and fix the top cover (100) to the connecting piece (200).

12. The top cover assembly according to claim 9, characterized in that, The top cover assembly (1) further includes a sealing ring (500), which is disposed between the first insulating member (300) and the second insulating member (400), and the sealing ring (500) is disposed between the inner circumferential surface of the connecting hole (101) and the pole post (201).

13. A battery, characterized in that, The device includes a housing (600) and a top cover assembly (1) as claimed in any one of claims 1-12, wherein the housing (600) has a mounting cavity and an opening communicating with the mounting cavity, and the top cover assembly (1) is connected to the opening to close the opening.

14. A battery module, characterized in that, Includes the battery (2) as described in claim 13.

15. A battery pack, characterized in that, Includes the battery module as described in claim 14.

16. An electrical appliance, characterized in that, Includes the battery (2) as described in claim 13, the battery module as described in claim 14, or the battery pack as described in claim 15.

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