Cover plate assembly, battery and electric device

Abstract

The invention provides a cover plate assembly, a battery and a power utilization device, the cover plate assembly comprises a cover plate body, an electrode terminal, a connecting piece, a first insulating piece and a supporting piece, and the cover plate body is provided with a mounting hole in the thickness direction of the cover plate body; the electrode terminal is arranged in the mounting hole; the connecting piece is sleeved on the electrode terminal around the mounting hole and is connected with the electrode terminal; the first insulating piece is arranged between the connecting piece and the cover plate body; a gap is formed between the edge, close to the mounting hole, of the first insulating part and the outer wall of the electrode terminal in the radial direction of the electrode terminal; the supporting piece is arranged in the gap and located between the connecting piece and the cover plate body. The melting point of the support member is greater than that of the first insulator. Therefore, the supporting piece and the first insulating piece are arranged among the cover plate assembly, the connecting piece and the cover plate body, when an external fire breaks out, the first insulating piece is melted, and the supporting effect of the supporting piece can prevent the situation that the electrode terminal sinks to cause sinking of the electrode terminal and lap joint short circuit occurs between the electrode terminal and the cover plate body.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a cover plate assembly, a battery and an electrical device. Background Art

[0002] With the increasing development of electronic products, the application of batteries is becoming more and more extensive. However, when the battery core catches fire due to thermal runaway, the fire will spread to the adjacent battery cores. The upper plastic part in the pole region of the battery core cover plate will melt at high temperature, thus losing the support for the pole. At the same time, under the resilience of the sealing ring inside the cover plate, the pole will sink. The sunken pole will make lap joint short circuit with the light aluminum sheet of the cover plate, resulting in failure, and further causing short circuit of all battery cores, with more serious consequences.

[0003] Therefore, how to solve the problem of lap joint short circuit between the pole and the light aluminum sheet caused by the melting of the upper plastic part is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, the present application provides a cover plate assembly, a battery and an electrical device, which can solve the technical problem of lap joint short circuit between the pole and the light aluminum sheet caused by the melting of the upper plastic part.

[0005] In order to achieve the above object, the present application provides the following technical solutions:

[0006] A cover plate assembly, comprising:

[0007] A cover plate body, provided with a mounting hole along its thickness direction;

[0008] An electrode terminal, arranged in the mounting hole;

[0009] A connecting piece, sleeved around the mounting hole on the electrode terminal and connected to the electrode terminal;

[0010] A first insulating part, arranged between the connecting piece and the cover plate body; along the radial direction of the electrode terminal, there is a gap between the edge of the first insulating part close to the mounting hole and the outer wall of the electrode terminal;

[0011] A support piece, arranged in the gap and located between the connecting piece and the cover plate body; the melting point of the support piece is greater than the melting point of the first insulating part.

[0012] Optionally, in the above cover plate assembly, along the thickness direction of the cover plate body, the thickness of the support piece is consistent with the thickness of the first insulating part;

[0013] And / or, along the thickness direction of the cover plate body, the thickness of the support piece is d, satisfying 0.5 mm ≤ d ≤ 2 mm.

[0014] Optionally, in the above-mentioned cover plate assembly, the electrode terminal includes a first connection part and a second connection part. The first connection part is arranged on one side of the cover plate body and covers the mounting hole, and the second connection part passes through the mounting hole and extends towards the other side of the cover plate body;

[0015] The connecting piece is sleeved on the second connection part and is located on the other side of the cover plate body relative to the first connection part.

[0016] Optionally, in the above-mentioned cover plate assembly, it further includes:

[0017] A seal, including a connected first seal part and a second seal part. The first seal part is pressed between the cover plate body and the first connection part of the electrode terminal, the second seal part is arranged between the cover plate body and the second connection part of the electrode terminal, and the second seal part abuts against the support piece or abuts against the connecting piece.

[0018] Optionally, in the above-mentioned cover plate assembly, along the axial direction of the seal, the supporting force of the support piece is not less than the compression resilience of the seal.

[0019] Optionally, in the above-mentioned cover plate assembly, the supporting force of the support piece is σ×S2, where σ is the compressive strength of the support piece, and S2 is the contact area between the cover plate body and the support piece on a plane perpendicular to the axial direction of the seal;

[0020] The compression resilience of the seal is S1×(130×e 2 -60×e + 9), where S1 is the contact area between the cover plate body and the first seal part on a plane perpendicular to the axial direction of the seal, and e is the compression rate of the first seal part along the thickness direction, satisfying: S1×(130×e 2 -60×e + 9) ≤ σ×S2.

[0021] Optionally, in the above-mentioned cover plate assembly, along the axial direction of the seal, the compression rate of the first seal part along its thickness direction is e, satisfying 25% ≤ e ≤ 50%.

[0022] Optionally, in the above-mentioned cover plate assembly, a groove is provided on the surface of the cover plate body around the mounting hole, and the support piece and at least part of the first insulating piece are arranged in the groove.

[0023] A battery includes at least one battery cell, and each battery cell includes the above-mentioned cover plate assembly.

[0024] An electrical device includes a plurality of the above-mentioned batteries.

[0025] The cover plate assembly provided by the present application is provided with a support member between the connecting member and the cover plate body, which can improve the safety of the cover plate. When a fire breaks out externally, once the first insulating member disposed between the connecting member and the cover plate body melts, since the melting point of the support member is greater than that of the first insulating member, the supporting effect of the support member can prevent the electrode terminal from sinking, avoiding the occurrence of the situation where the electrode terminal is in lap short circuit with the cover plate body, avoiding the failure of the battery cell, and further avoiding the occurrence of the situation where all battery cells are short-circuited. Moreover, the setting of the support member can also extend the failure time, that is, delay thermal runaway, and can increase the escape time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0027] Figure 1 is an exploded view of the cover plate assembly provided by the embodiment of the present application;

[0028] Figure 2 is a structural schematic diagram of the cover plate assembly provided by the embodiment of the present application;

[0029] Figure 3 is a top view of the cover plate assembly provided by the embodiment of the present application;

[0030] Figure 4 is Figure 3 the A-A sectional view in

[0031] Figure 5 is Figure 4 the partial enlarged view in

[0032] Figure 6 is a partial structural schematic of the cover plate body provided by the embodiment of the present application Figure 1 ;

[0033] Figure 7 is a partial structural schematic of the cover plate body provided by the embodiment of the present application Figure 2 。

[0034] Wherein:

[0035] 1. Cover plate body; 11. Mounting hole; 12. Groove;

[0036] 2. Electrode terminal; 21. First connection part; 22. Second connection part; 3. Connecting member;

[0037] 4. First insulating member; 5. Support member; 6. Sealing member; 61. First sealing portion; 62. Second sealing portion; 7. Second insulating member. Detailed implementation manners

[0038] This application provides a cover plate assembly.

[0039] Next, the technical solutions in the embodiments of this application will be described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0040] As Figures 1-7 shown, the embodiments of this application provide a cover plate assembly, which can solve the problem of the upper plastic part melting and causing the pole column and the light aluminum sheet to have a lap short circuit.

[0041] First, as Figure 1 shown, the cover plate assembly includes a cover plate body 1, an electrode terminal 2, a connecting member 3, a first insulating member 4, and a support member 5. Among them, the cover plate body 1 is provided with a mounting hole 11 along its thickness direction; the electrode terminal 2 is arranged in the mounting hole 11; the connecting member 3 is sleeved around the mounting hole 11 on the electrode terminal 2 and is connected to the electrode terminal 2; the first insulating member 4 is arranged between the connecting member 3 and the cover plate body 1; along the radial direction of the electrode terminal 2, there is a gap between the edge of the first insulating member 4 close to the mounting hole 11 and the outer wall of the electrode terminal 2; the support member 5 is arranged in the gap and is located between the connecting member 3 and the cover plate body 1; the melting point of the support member 5 is greater than the melting point of the first insulating member 4. Ensure that when the first insulating member 4 melts and fails, the support member 5 can still play a supporting role without being damaged. The connecting member 3 is used to fix the electrode terminal 2 to components such as the cover plate body 1, the sealing member 6, the first insulating member 4, and the second insulating member 7, and can also be used for electrical connection with external components.

[0042] The melting point of the support member 5 can be greater than 500 °C, and the insulation requirement is that the insulation resistance is greater than 200 MΩ under 1500 VDC. The material of the support member 5 can be ceramic phases such as ZrO2 and Al2O3, or glass phases such as SiO2, but is not limited thereto. The specific material and physical properties of the support member 5 can be specifically designed by those skilled in the art according to actual needs.

[0043] It can be seen that the cover plate assembly provided by the embodiment of the present application is provided with a support member 5 between the connecting member 3 and the cover plate body 1, which can improve the safety of the cover plate. When a fire breaks out externally, the first insulating member 4 provided between the connecting member 3 and the cover plate body 1 melts. Since the melting point of the support member 5 is higher than that of the first insulating member 4, the support member 5 can still play a supporting role. The supporting role of the support member 5 can further prevent the electrode terminal 2 from sinking, avoiding the occurrence of the situation where the electrode terminal 2 is in lap short circuit with the cover plate body 1, avoiding the failure of the battery cell, and further avoiding the occurrence of the situation where all battery cells are short-circuited. Moreover, the setting of the support member 5 can also extend the failure time, that is, delay thermal runaway, and can increase the escape time.

[0044] In specific implementation, along the thickness direction of the cover plate body 1, the thickness of the support member 5 is consistent with the thickness of the first insulating member 4. It should be noted that the thickness of the first insulating member 4 here is the compressed thickness b of the first insulating member 4. It can be understood that along the thickness direction of the cover plate body 1, the thickness of the first insulating member 4 pressed between the cover plate body 1 and the connecting member 3 is the same as the thickness of the support member 5.

[0045] In some embodiments, along the thickness direction of the cover plate body 1, the thickness of the support member 5 is d, satisfying 0.5 mm ≤ d ≤ 2 mm. It should be noted that d can be any one of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.5 mm, 2.0 mm.

[0046] The test results of the specific value of d, the supporting performance of the support member 5, and the sealing performance of the first insulating member 4 are shown in Table 1 below:

[0047] Table 1

[0048]

[0049] It can be seen from Table 1 that controlling the size of d can not only avoid the situation that the distance between the connecting member 3 and the cover plate body 1 is too close due to too small a size, and it is easy to occur high-voltage breakdown through the relatively small gap between the connecting member 3 and the cover plate body 1, but also avoid the situation that the support member 5 and the first insulating member 4 occupy the height space of the battery due to too large a size, and at the same time, the first insulating member 4 with the same thickness is prone to injection molding shrinkage.

[0050] In specific implementation, such as Figure 5As shown, the electrode terminal 2 includes a first connection portion 21 and a second connection portion 22. The first connection portion 21 is provided on one side of the cover body 1 and covers the mounting hole 11. The second connection portion 22 passes through the mounting hole 11 and extends towards the other side of the cover body 1. The connecting member 3 is sleeved on the second connection portion 22 and is located on the other side of the cover body 1 relative to the first connection portion 21. The first connection portion 21 is located on one side of the cover body 1, and the connecting member 3 is located on the other side of the cover body 1. The connecting member 3 cooperates with the first connection portion 21 to fix the first insulating member 4, the support member 5, the sealing member 6, and the second insulating member 7.

[0051] In specific implementation, the cover assembly further includes a sealing member 6. The sealing member 6 includes a connected first sealing portion 61 and a second sealing portion 62. The first sealing portion 61 is pressed between the cover body 1 and the first connection portion 21 of the electrode terminal 2 for insulating the electrode terminal 2 and the cover body 1. The second sealing portion 62 is provided between the cover body 1 and the second connection portion 22 of the electrode terminal 2, and the second sealing portion 62 abuts against the support member 5 or abuts against the connecting member 3 for improving the insulating and sealing performance of the cover assembly.

[0052] In specific implementation, along the axial direction of the sealing member 6, the supporting force of the support member 5 is not less than the compression resilience of the sealing member 6. Only when the supporting strength of the support member 5 is greater than the resilience stress of the sealing member 6 can it be ensured that the first insulating member 4 does not deform. And when the first insulating member 4 melts, the supporting force of the support member 5 can offset the compression resilience of the sealing member 6, avoiding the electrode terminal from sinking under the action of the compression resilience and causing a short - circuit situation (that is, the electrode terminal will not sink).

[0053] In specific implementation, as Figure 7 shown, the supporting force of the support member 5 is σ×S2, where σ is the compressive strength of the support member 5. For example, when the support member 5 is Al2O3, σ is generally 800 Mpa; S2 is the contact area between the cover body 1 and the support member 5 on a plane perpendicular to the axial direction of the sealing member 6, and the unit is mm 2 . It should be noted that Figure 7 only shows the cover body 1 and the contact area where the support member 5 contacts the cover body 1, and does not show the support member 5.

[0054] As Figure 6 shown, the resilience stress of the sealing member 6 at a certain compression ratio is 130×e 2 -60×e + 9, and the unit is N / mm 2 . The compression resilience of the sealing member 6 is the resilience stress multiplied by S1, which is S1×(130×e 2 -60×e + 9), where S1 is the contact area between the cover body 1 and the first sealing portion 61 on a plane perpendicular to the axial direction of the sealing member 6, and the unit is mm 2, where e is the compression ratio of the first sealing portion 61 in the thickness direction, the thickness of the first sealing portion 61 before compression is a, the thickness after compression is b, and the compression ratio e is satisfy: S1×(130×e 2 -60×e + 9) ≤ σ×S2. S1×(130×e 2 -60×e + 9), the unit is N; σ×S2, the unit is N. Among them, through actual measurement, the stress-strain values of the seal 6 at different compression ratios (such as 20%, 25%, 30%, 35%, 40%, etc.) are collected, and then the stress curve equation of the seal 6 between the compression ratios of 25% to 50% is deduced by fitting as 130×e 2 -60×e + 9. It should be noted that Figure 6 only shows the cover body 1 and the contact area where the first sealing portion 61 contacts the cover body 1, and does not show the first seal 61.

[0055] The test results of the specific values of e, the specific value of S1, and the specific value of S2 and the supporting performance of the support member 5 are shown in Table 2 below:

[0056] Table 2

[0057]

[0058] It can be seen from Table 2 that controlling the size of S2 can avoid the situation that once the first insulating member 4 melts and the electrode terminal 2 sinks, resulting in a short circuit due to its being too small.

[0059] During specific implementation, as Figures 5-6 shown, on the plane perpendicular to the axis of the seal 6, the dimension of the contact surface between the cover body 1 and the first sealing portion 61 in the radial direction of the seal 6 is c, satisfying 0.5mm ≤ c ≤ 1.5mm. It should be noted that c can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.5mm.

[0060] The test results of the specific value of c and the sealing performance of the seal 6 are shown in Table 3 below:

[0061] Table 3

[0062]

[0063] It can be seen from Table 3 that controlling the size of c can not only avoid the situation that the seal 6 itself has assembly tolerances due to too small a size, and is prone to poor sealing performance when slightly offset, but also avoid the situation that the seal 6 occupies the width space due to too large a size.

[0064] During specific implementation, as Figure 5As shown, along the axial direction of the seal 6, the compression ratio of the first sealing portion 61 in its thickness direction is e, satisfying 25% ≤ e ≤ 50%. The thickness of the first sealing portion 61 before compression is a, and the thickness after compression is b. The compression ratio is Satisfy It should be noted that the compression ratio of the first sealing portion 61 can be any one of 25%, 26%, 27%, 28%, 29%, 30%, 35%, 40%, 45%, 50%.

[0065] The test results of the compression ratio and its sealing performance of the first sealing portion 61 are shown in Table 4 below:

[0066] Table 4

[0067]

[0068] It can be seen from Table 4 that controlling the size of the compression ratio can not only avoid the situation where the compression ratio of the seal 6 is insufficient due to too small a compression ratio, resulting in a risk of air leakage in the cover plate, but also avoid the situation where the aging resistance of the seal 6 is poor due to too large a compression ratio, and the seal 6 is prone to permanent collapse that cannot be rebound, affecting the airtightness in the later stage.

[0069] During specific implementation, such as Figure 5 As shown, a groove 12 is provided on the surface of the cover plate body 1 around the mounting hole 11, and the support member 5 and at least part of the first insulating member 4 are arranged in the groove 12. The groove 12 is recessed in the side surface of the cover plate body 1 facing the connecting member 3, and the groove 12 surrounds the second connecting portion 22 of the electrode terminal 2. The groove 12 provides a specific installation space for the support member 5 and at least part of the first insulating member 4, which helps to accurately position the support member 5 and the first insulating member 4.

[0070] During specific implementation, the cover plate assembly further includes a second insulating member 7, and the second insulating member 7 is arranged on the surface of the cover plate body 1 facing away from the first insulating member 4 for insulating the electrode terminal 2 and the cover plate body 1.

[0071] During specific implementation, the support member 5 can be an annular member; or, the support member 5 is a plurality of annular members arranged at intervals in the radial direction of the mounting hole 11; or, the support member 5 is provided with a plurality of structural members at intervals in the circumferential direction of the mounting hole 11.

[0072] The embodiment of the present application also provides a battery, including at least one battery cell, and each battery cell includes the above cover plate assembly.

[0073] It can be seen that in the battery provided by the embodiment of the present application, a support member 5 is provided between the connection member 3 and the cover body 1 of the cover plate assembly, which can improve the safety of the cover plate. When a fire breaks out externally, the first insulating member 4 provided between the connection member 3 and the cover body 1 melts. Since the melting point of the support member 5 is higher than that of the first insulating member 4, the support member 5 can still play a supporting role. The supporting role of the support member 5 can prevent the electrode terminal 2 from sinking, avoiding the occurrence of the situation where the electrode terminal 2 is in lap short circuit with the cover body 1, avoiding the failure of the battery cell, and further avoiding the occurrence of the situation where all battery cells are short-circuited. Moreover, the setting of the support member 5 can also extend the failure time, that is, delay thermal runaway, and can increase the escape time.

[0074] The embodiment of the present application also provides an electrical device, including a plurality of the above-mentioned batteries.

[0075] Since the electrical device adopts the battery in the above-mentioned embodiment, the beneficial effects of the electrical device can refer to the above-mentioned embodiment.

[0076] The electrical device of the present invention is not particularly limited, and it may include but is not limited to: notebook computers, pen input type computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, liquid crystal televisions, portable cleaners, portable CD players, mini discs, transceivers, electronic notebooks, calculators, memory cards, portable tape recorders, radios, backup power supplies, motors, automobiles, motorcycles, motorized bicycles, bicycles, lighting appliances, toys, game consoles, clocks, power tools, flashlights, cameras, large household storage batteries, and lithium-ion capacitors, etc.

[0077] The basic principle of the present application has been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purpose of illustration and easy understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details to implement.

[0078] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the phrase "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0079] It should also be noted that in the devices, equipment, and methods of this application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of this application.

[0080] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0081] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth", and "sixth" used in the description of the embodiments of this application are only used to more clearly elaborate the technical solutions and cannot be used to limit the protection scope of this application.

[0082] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A cover plate assembly, characterized in that, Comprising: A cover body (1) having a mounting hole (11) provided along its thickness direction; An electrode terminal (2) disposed in the mounting hole (11); A connecting member (3) sleeved around the mounting hole (11) and connected to the electrode terminal (2); A first insulating member (4) disposed between the connecting member (3) and the cover body (1); along the radial direction of the electrode terminal (2), there is a gap between the edge of the first insulating member (4) close to the mounting hole (11) and the outer wall of the electrode terminal (2); A support member (5) disposed in the gap and located between the connecting member (3) and the cover body (1); the melting point of the support member (5) is greater than the melting point of the first insulating member (4).

2. The cover plate assembly according to claim 1, wherein Along the thickness direction of the cover body (1), the thickness of the support member (5) is consistent with the thickness of the first insulating member (4); And / or, along the thickness direction of the cover body (1), the thickness of the support member (5) is d, satisfying 0.5 mm ≤ d ≤ 2 mm.

3. The cover plate assembly according to claim 1, wherein The electrode terminal (2) includes a first connecting portion (21) and a second connecting portion (22), the first connecting portion (21) is disposed on one side of the cover body (1) and covers the mounting hole (11), and the second connecting portion (22) passes through the mounting hole (11) and extends towards the other side of the cover body (1); The connecting member (3) is sleeved on the second connecting portion (22) and is located on the other side of the cover body (1) relative to the first connecting portion (21).

4. The cover plate assembly according to any one of claims 1-3, characterized in that, Further comprising: A sealing member (6) including a connected first sealing portion (61) and a second sealing portion (62), wherein the first sealing portion (61) is pressed between the cover body (1) and the first connecting portion (21) of the electrode terminal (2), the second sealing portion (62) is disposed between the cover body (1) and the second connecting portion (22) of the electrode terminal (2), and the second sealing portion (62) abuts against the support member (5) or abuts against the connecting member (3).

5. The cover plate assembly according to claim 4, wherein Along the axial direction of the sealing member (6), the supporting force of the support member (5) is not less than the compression resilience of the sealing member (6).

6. The cover plate assembly according to claim 4, wherein, The supporting force of the support member (5) is σ × S2, where σ is the compressive strength of the support member (5) and S2 is the contact area between the cover body (1) and the support member (5); The compression resilience of the seal (6) is S1×(130×e 2 -60×e + 9), where S1 is the contact area between the cover plate body (1) and the first sealing portion (61) on a plane perpendicular to the axial direction of the seal (6), and e is the compression rate of the first sealing portion (61) in the thickness direction, satisfying: S1×(130×e 2 -60×e + 9) ≤ σ×S2.

7. The cover plate assembly according to claim 4, wherein Along the axial direction of the sealing member (6), the compression rate of the first sealing portion (61) along its thickness direction is e, satisfying 25% ≤ e ≤ 50%.

8. The cover plate assembly according to claim 1, wherein A groove (12) is provided on the surface of the cover body (1) around the mounting hole (11), and the support member (5) and at least part of the first insulating member (4) are disposed in the groove (12).

9. A battery, characterized in that, Comprising at least one battery cell, and each battery cell includes the cover assembly according to any one of claims 1-8.

10. An electrical device, characterized in that, Comprising a plurality of the batteries according to claim 9.

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