Cover plate, battery and electric equipment

Abstract

The utility model provides a cover plate, a battery and electric equipment. The cover plate comprises a cover plate body, an anti-explosion structure and a copper layer, the anti-explosion structure is arranged on the cover plate body, the copper layer is arranged on at least one side of the cover plate body and covers the anti-explosion structure, and the cover plate body and the copper layer are made of different materials. According to the cover plate, the cover plate body is provided with the copper layer, the copper layer can prevent the cover plate body from being corroded, and the anti-corrosion performance of the cover plate body is improved. The anti-explosion structure is covered with the copper layer, the anti-corrosion performance of the anti-explosion structure can be improved, the situation that the opening force is inconsistent due to the fact that the anti-explosion structure is corroded is avoided, and the consistency of the opening force of the anti-explosion structure is guaranteed. And meanwhile, the heat conductivity of the copper is higher, so that the heat dissipation of the battery is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery structure, in particular to a cover plate, a battery and an electric device. BACKGROUND

[0002] The cover plate plays an important role in the production of batteries. The cover plate is an external closed part of a battery (such as common AA, AAA, etc. batteries), which is usually used to protect the internal structure of the battery, maintain the safety of the battery, and provide positive and negative contact points of the battery. In order to ensure the structural strength of the cover plate and the battery, the cover plate is usually made of metal material and has a certain structural design to ensure that the battery can work effectively.

[0003] The cover plate in the related art is prone to corrosion. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a cover plate, a battery and an electric device, which can improve the technical problem that the cover plate is prone to corrosion.

[0005] In a first aspect, embodiments of the present application provide a cover plate, comprising:

[0006] a cover plate body;

[0007] an explosion-proof structure arranged on the cover plate body;

[0008] a copper layer arranged on at least one side of the cover plate body, the copper layer covering the explosion-proof structure, and the cover plate body and the copper layer being made of different materials.

[0009] In an embodiment, the upper surface of the cover plate body is provided with the copper layer; and / or, the lower surface of the cover plate body is provided with the copper layer.

[0010] In an embodiment, the copper layer is arranged on the cover plate body by electroplating or chemical plating.

[0011] In an embodiment, the ratio of the thickness of the copper layer to the thickness of the cover plate body is between 0.1% and 10%.

[0012] In an embodiment, the explosion-proof structure comprises an explosion-proof notch, and the bottom wall and the side wall of the explosion-proof notch are covered with the copper layer.

[0013] In an embodiment, the thickness of the copper layer at the bottom wall of the explosion-proof notch is between 0.1 μm and 6 μm; and / or,

[0014] The thickness of the copper layer at the bottom wall of the explosion-proof notch is less than the thickness of the copper layer at the side wall of the explosion-proof notch; and / or,

[0015] a thickness of the copper layer at the side wall of the explosion-proof notch is less than a thickness of the copper layer at a circumferential side of the opening of the explosion-proof notch; and / or,

[0016] a junction of the copper layer at the bottom wall of the explosion-proof notch and the copper layer at the side wall of the explosion-proof notch is provided with a chamfer; and / or,

[0017] a junction of the copper layer at the side wall of the explosion-proof notch and the copper layer at the circumferential side of the opening of the explosion-proof notch is provided with a chamfer.

[0018] In an embodiment, the copper layer has a durometer value greater than 36.

[0019] In a second aspect, embodiments of the present application provide a battery, comprising a shell, an electrode assembly and a cover plate as described above, the shell is formed with a mounting cavity, the electrode assembly is mounted in the mounting cavity, and the cover plate is connected with the shell.

[0020] In an embodiment, the battery further comprises an electrode connecting sheet, a first end of the electrode connecting sheet is connected with the electrode assembly, a second end of the electrode connecting sheet is connected with the cover plate, and a material of the second end of the electrode connecting sheet is the same as a material of the copper layer; and / or, the cover plate body is formed with a groove, and a groove opening of the groove faces away from the mounting cavity.

[0021] In a second aspect, embodiments of the present application provide a battery, comprising a shell, an electrode assembly and a cover plate as described above, the shell is formed with a mounting cavity, the electrode assembly is mounted in the mounting cavity, and the cover plate is connected with the shell.

[0022] The embodiments of the present application have the following beneficial effects:

[0023] In the embodiments of the present application, the copper layer is arranged at the cover plate body, which can prevent the cover plate body from being corroded and improve the corrosion resistance of the cover plate body. The copper layer covers the explosion-proof structure, which can improve the corrosion resistance of the explosion-proof structure and avoid the situation that the explosion-proof structure is corroded to cause inconsistent opening forces.

[0024] The copper layer is used as the corrosion protection layer, and the copper plating can be realized at room temperature, i.e., the copper layer can be arranged on the cover plate body without heating, which can avoid the situation that the explosion-proof structure is strengthened due to heating and ensure the consistency of the opening forces of the explosion-proof structure. Meanwhile, the copper has high thermal conductivity, which is conducive to heat dissipation of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] Figure 1 is one of structural schematic diagrams of the cover plate provided by an embodiment of the present application;

[0027] Figure 2 is another one of structural schematic diagrams of the cover plate provided by an embodiment of the present application;

[0028] Figure 3 is a sectional view of the cover plate provided by an embodiment of the present application;

[0029] Figure 4 is Figure 3 is an enlarged schematic diagram of the structure at A in FIG. 4;

[0030] Figure 5 is a structural schematic diagram of the battery provided by an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the positional words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0032] The cover plate, the battery and the electric device according to the present application will be described below in conjunction with Figures 1 to 5 the drawings.

[0033] According to the embodiments of the first aspect of the present application, as Figure 1 , Figure 2 , Figure 3 and Figure 4 , the cover plate comprises a cover plate body 10, an explosion-proof structure 20 and a copper layer 30, the explosion-proof structure 20 is arranged on the cover plate body 10, at least one side of the cover plate body 10 is provided with the copper layer 30, the copper layer 30 covers the explosion-proof structure 20, and the cover plate body 10 and the copper layer 30 are made of different materials.

[0034] According to the cover plate provided by the embodiments of the present application, the copper layer 30 can prevent the cover plate body 10 from being corroded, and improve the corrosion resistance of the cover plate body 10 by arranging the copper layer 30 on the cover plate body 10. The copper layer 30 covers the explosion-proof structure 20, which can improve the corrosion resistance of the explosion-proof structure 20 and avoid the situation that the explosion-proof structure 20 is corroded and the opening force is inconsistent.

[0035] And the copper layer 30 is used as an anti-corrosion protective layer, and copper plating can be realized at room temperature, that is, the copper layer 30 can be arranged on the cover plate body 10 without heating, which can avoid the strengthening of the explosion-proof structure 20 due to heating and ensure the consistency of the opening force of the explosion-proof structure 20. At the same time, since copper has high thermal conductivity, it is beneficial to heat dissipation of the battery.

[0036] It can be understood that in the related art, nickel plating is used to improve the anti-corrosion performance of the cover plate, but nickel plating cannot be realized at room temperature and needs to be combined with heating to realize nickel plating on the cover plate. In the process of heating nickel plating, the explosion-proof valve of the cover plate is strengthened and the opening force is inconsistent. The application improves the anti-corrosion performance of the cover plate by arranging a copper layer 30 on the cover plate body 10. Copper plating can be realized at room temperature, that is, the copper layer 30 can be arranged on the cover plate body 10 at room temperature, without the need for a heating step, thereby avoiding the inconsistent opening force of the explosion-proof structure 20 of the cover plate body 10 due to heating.

[0037] It can be understood that in the related art, nickel plating is used to improve the anti-corrosion performance of the cover plate, but the surface density of the nickel layer is insufficient and the porosity is large, which is prone to iron leakage. The application improves the anti-corrosion performance of the cover plate by arranging a copper layer 30 on the cover plate body 10. The copper layer 30 has a denser surface than the nickel layer and lower porosity, which can effectively reduce the possibility of iron leakage.

[0038] It can be understood that when the cover plate is installed on the battery, the connection piece of the battery needs to be connected with the cover plate. Considering factors such as stability and cost, the connection piece of the battery is mostly a copper connection piece. Therefore, when the cover plate is protected by nickel plating in the related art, the connection between the connection piece and the cover plate is a contact between copper material and nickel material, that is, the connection between the connection piece and the cover plate is prone to a potential difference, which in turn causes the cover plate to be corroded and affects the safety of the battery. The application uses the copper layer 30 to cover and protect the cover plate, so that the connection between the connection piece and the cover plate is a contact between copper material and copper material, so that no potential difference is generated between the connection piece and the cover plate body 10. This can effectively prevent the cover plate body 10 from being corroded due to the potential difference, improve the anti-corrosion performance of the cover plate body 10, and ensure the safety of the battery.

[0039] It can be understood that at least one side of the cover plate body 10 is provided with a copper layer 30, which means that one or more walls of the cover plate are provided with a copper layer 30, or all surfaces of the cover plate body 10 are provided with a copper layer 30.

[0040] In some examples, the cover plate body 10 and the explosion-proof structure 20 are integrally formed.

[0041] In some examples, the cover plate body 10 is made of cold-rolled steel, stainless steel or composite material (at least two materials are combined).

[0042] In some embodiments, the upper surface of the cover plate body 10 is provided with a copper layer 30.

[0043] It can be understood that by providing the copper layer 30 on the upper surface of the cover plate body 10, the copper layer 30 can protect the upper surface of the cover plate body 10 from corrosion, thereby improving the corrosion resistance of the cover plate body 10. Since the copper layer 30 can be provided on the cover plate body 10 at room temperature, the difficulty of protecting the cover plate from corrosion is reduced, and the copper layer 30 has excellent compactness and low porosity, which can effectively avoid the possibility of iron leakage. At the same time, the copper layer 30 has excellent ductility, so that the copper layer 30 is not easy to fall off during the production process of the battery, so that the copper layer 30 can stably protect the cover plate body 10.

[0044] In some embodiments, the lower surface of the cover plate body 10 is provided with a copper layer 30.

[0045] It can be understood that by providing the copper layer 30 on the lower surface of the cover plate body 10, the copper layer 30 can protect the lower surface of the cover plate body 10 from corrosion, thereby improving the corrosion resistance of the cover plate body 10. Since the copper layer 30 can be provided on the cover plate body 10 at room temperature, the difficulty of protecting the cover plate from corrosion is reduced, and the copper layer 30 has excellent compactness and low porosity, which can effectively avoid the possibility of iron leakage. At the same time, the copper layer 30 has excellent ductility, so that the copper layer 30 is not easy to fall off during the production process of the battery, so that the copper layer 30 can stably protect the cover plate body 10.

[0046] In some examples, the battery includes a shell 40, and the cover plate is connected to the shell 40. The side of the cover plate facing the inner bottom wall of the shell 40 is the lower surface of the cover plate, and the side of the cover plate away from the inner bottom wall of the shell 40 is the upper surface of the cover plate.

[0047] In some embodiments, the side wall surface of the cover plate body 10 is provided with a copper layer 30.

[0048] It can be understood that by arranging the copper layer 30 on the side wall surface of the cover plate body 10, the copper layer 30 can protect the side wall surface of the cover plate body 10, avoid the side wall surface of the cover plate body 10 from being corroded, and improve the corrosion resistance of the cover plate body 10. Since the copper layer 30 can be arranged on the cover plate body 10 at room temperature, the difficulty of protecting the cover plate from corrosion is reduced, and the copper layer 30 has excellent compactness and low porosity, which can effectively avoid the possibility of iron leakage. At the same time, the copper layer 30 has excellent ductility, so that the copper layer 30 is not easy to fall off during the production process of the battery, so that the copper layer 30 can stably protect the cover plate body 10.

[0049] In some examples, the copper layer 30 can be arranged on the upper surface and the lower surface of the cover plate body 10 at the same time, so as to protect the upper surface and the lower surface of the cover plate body 10 with the copper layer 30, which can effectively prevent the upper surface and the lower surface of the cover plate body 10 from being corroded.

[0050] In some examples, the copper layer 30 can be arranged on the upper surface of the cover plate body 10, the lower surface of the cover plate body 10, and the side wall surface of the cover plate body 10 at the same time, that is, the copper layer 30 is used to cover the cover plate body 10 comprehensively, so that the copper layer 30 can comprehensively protect the cover plate body 10, effectively avoiding corrosion of the cover plate body 10.

[0051] In some embodiments, the copper layer 30 is arranged on the cover plate body 10 by electroplating or chemical plating.

[0052] It can be understood that the copper layer 30 is arranged on the cover plate body 10 by electroplating, so that the copper layer 30 can protect the cover plate body 10, avoid the cover plate body 10 from being corroded by external corrosion and electrolyte corrosion. Since the copper layer 30 can be arranged on the cover plate body 10 at room temperature, the difficulty of arranging the copper layer 30 on the cover plate body 10 is reduced, and without heating, the anti-explosion structure 20 will not be strengthened to cause inconsistent opening force. And the copper layer 30 has excellent compactness and low porosity, which can effectively avoid the possibility of iron leakage. At the same time, the copper layer 30 has excellent ductility, so that the copper layer 30 is not easy to fall off during the production process of the battery, so that the copper layer 30 can stably protect the cover plate body 10.

[0053] It can be understood that the copper layer 30 is arranged on the cover plate body 10 by electroless plating, so that the copper layer 30 can play a protective role on the cover plate body 10, avoiding the cover plate body 10 from being corroded by external corrosion and electrolyte corrosion. Since the copper layer 30 can be arranged on the cover plate body 10 at room temperature, the difficulty of arranging the copper layer 30 on the cover plate body 10 is reduced, and without heating, the situation that the opening force of the reinforced explosion-proof structure 20 is inconsistent will not occur. Moreover, the copper layer 30 has excellent compactness and low porosity, which can effectively avoid the possibility of iron leakage. At the same time, the copper layer 30 has excellent ductility, so that the copper layer 30 is not easy to fall off during the production process of the battery, so that the copper layer 30 can play a stable protective role on the cover plate body 10.

[0054] In some embodiments, the ratio of the thickness of the copper layer 30 to the thickness of the cover plate body 10 is between 0.1% and 10%.

[0055] It can be understood that if the ratio of the thickness of the copper layer 30 to the thickness of the cover plate body 10 is less than 0.1%, the thickness of the copper layer 30 is too thin to effectively protect the cover plate body 10, and the cover plate body 10 may still be corroded. If the ratio of the thickness of the copper layer 30 to the thickness of the cover plate body 10 is greater than 10%, the thickness of the copper layer 30 is too thick, which will cause the overall thickness of the cover plate to be too large, which is not conducive to the miniaturization design of the cover plate. Therefore, the ratio of the thickness of the copper layer 30 to the thickness of the cover plate body 10 is set to be between 0.1% and 10% in the present application, so that the copper layer 30 can not only effectively protect the cover plate body 10 and avoid corrosion of the cover plate body 10, but also reduce the influence of the copper layer 30 on the overall thickness of the cover plate, avoid the thickness of the cover plate being too large, and be conducive to the miniaturization design of the cover plate.

[0056] In some embodiments, as Figure 1 , Figure 2 and Figure 3 , the explosion-proof structure 20 includes an explosion-proof notch 201, and the bottom wall and the side wall of the explosion-proof notch 201 are covered with the copper layer 30.

[0057] It can be understood that by arranging the copper layer 30 on the bottom wall and the side wall of the explosion-proof notch 201, the copper layer 30 is used to protect the explosion-proof notch 201, effectively preventing the explosion-proof notch 201 from being corroded. The stability of the explosion-proof structure 20 is improved.

[0058] In some examples, the number of explosion-proof notches 201 is at least two, and the at least two explosion-proof notches 201 are uniformly distributed on the cover plate body 10. For example, the at least two explosion-proof notches 201 are uniformly distributed along the circumference of the cover plate body 10.

[0059] In some examples, the explosion-proof notch 201 is a ring-shaped notch, and the ring-shaped notch is arranged around the center point of the cover plate body 10.

[0060] In some embodiments, the thickness of the copper layer 30 at the bottom wall of the explosion-proof notch 201 is between 0.1 μm and 6 μm.

[0061] It can be understood that if the thickness of the copper layer 30 at the bottom wall of the explosion-proof notch 201 is less than 0.1 μm, the copper layer 30 is difficult to effectively protect the explosion-proof notch 201, and the explosion-proof notch 201 can still be corroded. If the thickness of the copper layer 30 at the bottom wall of the explosion-proof notch 201 is greater than 6 μm, the thickness of the copper layer 30 is too large, the influence of the copper layer 30 on the opening force of the explosion-proof notch 201 is too large, and the opening force of the explosion-proof notch 201 is prone to be too large. Therefore, the thickness of the copper layer 30 at the bottom wall of the explosion-proof notch 201 is set to be between 0.1 μm and 6 μm, so that the copper layer 30 can not only effectively protect the explosion-proof notch 201 and avoid corrosion of the explosion-proof notch 201, but also reduce the influence of the copper layer 30 on the opening force of the explosion-proof notch 201, and avoid the opening force of the explosion-proof notch 201 being too large.

[0062] In some embodiments, the thickness of the copper layer 30 at the bottom wall of the explosion-proof notch 201 is less than the thickness of the copper layer 30 at the side wall of the explosion-proof notch 201, so as to facilitate copper plating at the explosion-proof notch 201 to obtain the copper layer 30, and improve the convenience of processing the cover plate.

[0063] In some embodiments, the thickness of the copper layer 30 at the side wall of the explosion-proof notch 201 is less than the thickness of the copper layer 30 at the circumferential side of the opening of the explosion-proof notch 201, so as to facilitate copper plating at the surface of the cover plate to obtain the copper layer 30, and improve the convenience of processing the cover plate.

[0064] In some embodiments, a chamfer is arranged at the connection between the copper layer 30 at the bottom wall of the explosion-proof notch 201 and the copper layer 30 at the side wall of the explosion-proof notch 201, so as to facilitate the stamping forming of the explosion-proof notch 201.

[0065] In some embodiments, a chamfer is arranged at the connection between the copper layer 30 at the side wall of the explosion-proof notch 201 and the copper layer 30 at the circumferential side of the opening of the explosion-proof notch 201, so as to facilitate the stamping forming of the explosion-proof notch 201.

[0066] In some embodiments, the dynes value of the copper layer 30 is greater than 36, which ensures the bonding force of the copper layer 30 and the cover plate body 10, so that the copper layer 30 can be stably connected with the cover plate body 10, and the copper layer 30 can effectively avoid falling off, so that the copper layer 30 can stably protect the cover plate body 10, and effectively prevent the cover plate body 10 from being corroded.

[0067] It can be understood that the dyne value is usually a parameter used to describe the adhesion or adhesion of a coating, plating or surface coating material, which is an important indicator of the adhesion between the plating and the substrate.

[0068] In some examples, the copper layer 30 is provided on the cover plate body 10 by electroplating or electroless plating.

[0069] According to the embodiments of the second aspect of the application, the battery comprises the cover plate described above.

[0070] According to the battery of the embodiments of the application, by providing the copper layer 30 at the cover plate body 10, the copper layer 30 can prevent the cover plate body 10 from being corroded, and improve the corrosion resistance of the cover plate body 10. The copper layer 30 covers the explosion-proof structure 20, which can improve the corrosion resistance of the explosion-proof structure 20 and avoid the situation that the explosion-proof structure 20 is corroded to cause inconsistent opening force.

[0071] And the copper layer 30 is used as a corrosion protection layer, and copper plating can be realized at room temperature, that is, the copper layer 30 can be provided on the cover plate body 10 without heating, which can avoid the situation that the explosion-proof structure 20 is strengthened due to heating, and ensure the consistency of the opening force of the explosion-proof structure 20. At the same time, since copper has high thermal conductivity, it is beneficial to heat dissipation of the battery.

[0072] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 , the battery further comprises a shell 40 and an electrode assembly 50, the shell 40 is formed with a mounting cavity 401, the electrode assembly 50 is mounted in the mounting cavity 401, and the cover plate is connected with the shell 40.

[0073] In some embodiments, the battery further comprises an electrode connecting piece, a first end of the electrode connecting piece is connected with the electrode assembly 50, a second end of the electrode connecting piece is connected with the cover plate, and the material of the second end of the electrode connecting piece is the same as that of the copper layer 30.

[0074] It can be understood that the material of the second end of the electrode connecting piece is set to be the same as that of the copper layer 30, so that no potential difference is generated at the connection between the electrode connecting piece and the cover plate, and the corrosion of the cover plate body 10 caused by the potential difference is avoided.

[0075] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 , the cover plate body 10 is formed with a groove 101, the groove opening of the groove 101 faces away from the mounting cavity 401, and the wall surface of the groove 101 is provided with the copper layer 30.

[0076] It can be understood that the groove 101 is arranged on the side of the cover plate body 10 away from the mounting cavity 401, so that the force can be applied to the cover plate through the groove 101, and the cover plate is convenient to rotate.

[0077] It can be understood that the copper layer 30 is arranged on the wall surface of the groove 101, so that the copper layer 30 can protect the wall surface of the groove 101 and avoid corrosion of the wall surface of the groove 101.

[0078] In some embodiments, the thickness of the copper layer 30 at the bottom wall of the groove 101 is less than the groove depth of the groove 101.

[0079] It can be understood that the copper layer 30 is arranged on the bottom wall of the groove 101, so that the copper layer 30 can protect the bottom wall of the groove 101 and avoid corrosion of the bottom wall of the groove 101. At the same time, since the thickness of the copper layer 30 at the bottom wall is less than the groove depth of the groove 101, the copper layer 30 will not fill the groove 101, that is, the copper layer 30 at the groove 101 will not protrude from the groove 101, and the force can still be applied to the cover plate body 10 through the groove 101.

[0080] According to the third aspect of the present application, the power equipment includes the above-mentioned battery.

[0081] According to the power equipment of the present application, the copper layer 30 is arranged on the cover plate body 10, which can prevent the cover plate body 10 from being corroded, improve the corrosion resistance of the cover plate body 10, and further improve the use safety of the battery and the power equipment. The copper layer 30 covers the explosion-proof structure 20, which can improve the corrosion resistance of the explosion-proof structure 20 and avoid the situation that the explosion-proof structure 20 is corroded and the opening force is inconsistent.

[0082] The copper layer 30 is used as a corrosion protection layer, and copper plating can be realized at room temperature, that is, the copper layer 30 can be arranged on the cover plate body 10 without heating, which can avoid the strengthening of the explosion-proof structure 20 due to heating and ensure the consistency of the opening force of the explosion-proof structure 20. At the same time, since copper has high thermal conductivity, it is beneficial to heat dissipation of the battery.

[0083] It should be noted that the power equipment can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the power equipment, and does not specially limit the power equipment.

[0084] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application have been described by applying specific examples in this paper, the above embodiment explanation is only for helping understanding the method of the application and its core idea; at the same time, for the person skilled in the art, according to the idea of the application, there will be changes in specific implementation mode and application range, and the above-mentioned, the content of the specification should not be understood as the limitation of the application.

Claims

1. A cover plate, characterized in that The cover plate body is provided with a copper layer on at least one side of the cover plate body, and the copper layer covers the explosion-proof structure, and the cover plate body and the copper layer are made of different materials. The upper surface of the cover plate body is provided with the copper layer; and / or, the lower surface of the cover plate body is provided with the copper layer. The copper layer is provided on the cover plate body by electroplating or chemical plating. The ratio of the thickness of the copper layer to the thickness of the cover plate body is between 0.1% and 10%.

2. The cover sheet of claim 1, wherein The explosion-proof structure includes an explosion-proof notch, and the bottom wall and the side wall of the explosion-proof notch are covered with the copper layer.

3. The cover sheet of claim 1, wherein, The thickness of the copper layer at the bottom wall of the explosion-proof notch is between 0.1 μm and 6 μm; and / or, 4. The cover sheet according to any one of claims 1 to 3, characterized in that The thickness of the copper layer at the bottom wall of the explosion-proof notch is less than the thickness of the copper layer at the side wall of the explosion-proof notch; 5. The cover sheet according to any one of claims 1 to 3, characterized in that And / or, 6. The cover sheet of claim 5, wherein, The thickness of the copper layer at the side wall of the explosion-proof notch is less than the thickness of the copper layer at the circumferential side of the opening of the explosion-proof notch; And / or, The connection between the copper layer at the bottom wall of the explosion-proof notch and the copper layer at the side wall of the explosion-proof notch is provided with a chamfer; and / or, The connection between the copper layer at the side wall of the explosion-proof notch and the copper layer at the circumferential side of the opening of the explosion-proof notch is provided with a chamfer. The durometer value of the copper layer is greater than 36. The battery further includes an electrode assembly installed in the mounting cavity of the shell, and a cover plate connected with the shell, wherein the cover plate is as claimed in any one of claims 1 to 7. The battery further includes an electrode connecting sheet, a first end of the electrode connecting sheet is connected with the electrode assembly, a second end of the electrode connecting sheet is connected with the cover plate, and the material of the second end of the electrode connecting sheet is the same as that of the copper layer; and / or, the cover plate body is formed with a groove, the groove opening is directed away from the mounting cavity, and the wall surface of the groove is provided with the copper layer.

7. The cover sheet according to any one of claims 1 to 3, characterized in that The battery includes the battery as claimed in any one of claims 8 to 9.

8. A battery, characterized by The battery includes the battery as claimed in any one of claims 8 to 9.

9. The battery of claim 8, wherein, ​ 10. An electric device, characterized by ​

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