Explosion-proof aluminum sheet and battery cap body

Abstract

The utility model relates to the technical field of power batteries, in particular to an explosion-proof aluminum sheet and a battery cap body, the explosion-proof aluminum sheet is welded with a steel cap, and the part, welded with the steel cap, of the edge of the explosion-proof aluminum sheet forms a thinned welding part, so that the thickness of the welding part is smaller than that of a main body of the explosion-proof aluminum sheet. The technical problem that in the prior art, poor arc welding is prone to occurring during welding of an anti-explosion aluminum sheet and a steel cap of a battery cap body is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and specifically relates to an explosion-proof aluminum sheet and a battery cap body. Background Art

[0002] The battery cap body is an important component in a lithium-ion battery, which is responsible for protecting the internal structure of the battery from the external environment, and at the same time avoiding safety problems such as battery short circuit or leakage. The battery cap body is usually made of thermoplastic elastomer material, which has good elasticity and heat resistance, can adapt to the internal pressure change of the battery, and maintain the sealing performance of the battery. It also integrates a protection circuit, which can monitor the working state of the battery in real time and protect the battery when necessary, such as automatically cutting off the circuit when the internal pressure is too high to prevent accidents such as battery explosion.

[0003] During the assembly process of the battery cap body, it is necessary to fold and envelope the explosion-proof aluminum sheet onto the steel cap, and then weld at the folding place. However, in the existing technology, the welding of the explosion-proof aluminum sheet and the steel cap is prone to welding explosion, and the welding place turns yellow and black. Summary of the Utility Model

[0004] In order to solve the technical problem that the welding of the explosion-proof aluminum sheet and the steel cap of the battery cap body in the existing technology is prone to arc welding defects, the present application proposes an explosion-proof aluminum sheet and a battery cap body, which solve the above technical problems.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0006] The utility model provides an explosion-proof aluminum sheet for welding with a steel cap. The part of the edge of the explosion-proof aluminum sheet welded to the steel cap is formed into a thinning welding part, so that the thickness of the welding part is less than the main body thickness of the explosion-proof aluminum sheet.

[0007] Further, one side of the welding part of the explosion-proof aluminum sheet is attached to the steel cap, and the other side of the welding part gradually narrows towards the center area of the welding.

[0008] Further, the edge of the explosion-proof aluminum sheet is thinned by stamping before the explosion-proof aluminum sheet is folded, so as to form a pre-filled groove on the surface of the edge of the explosion-proof aluminum sheet in contact with the steel cap. After the edge of the explosion-proof aluminum sheet is folded, it is attached to the steel cap and is extruded so that the edge of the explosion-proof aluminum sheet feeds and fills towards the pre-filled groove, and finally the side of the edge of the explosion-proof aluminum sheet facing away from the steel cap gradually narrows and thins towards the center area of the welding to form the welding part.

[0009] The utility model also provides a battery cap body, including the above-mentioned explosion-proof aluminum sheet.

[0010] Based on the above technical solutions, the technical effects that the utility model can achieve are:

[0011] For the explosion-proof aluminum sheet of the present utility model, through the analysis of the phenomenon that the welding part is prone to welding explosion and turns yellow or black in the prior art, it is found that it is because the thickness of the explosion-proof aluminum sheet is too thick, resulting in a large amount of energy required for welding. For example, the power of the laser welding machine needs to be adjusted to 100W to complete the welding. However, if the overall thickness of the explosion-proof aluminum sheet is reduced, the structural strength of the finished battery cap body will be affected. In view of this, the part of the explosion-proof aluminum sheet of the present utility model where the edge is welded to the steel cap is formed into a thinning welding part, and the thickness of the welding part is less than that of the main body of the explosion-proof aluminum sheet, so that the energy required for welding is reduced. For example, when using the explosion-proof aluminum sheet of the present utility model for welding, the power of the laser welding machine can be adjusted to 80W to complete the welding, thereby improving the poor arc welding situation, reducing the occurrence of welding explosion, and avoiding the yellowing and blackening of the welding part;

[0012] For the explosion-proof aluminum sheet of the present utility model, starting from actual production and taking into account the simplicity of the production process and cost, the edge of the explosion-proof aluminum sheet is thinned by stamping before being folded, and a pre-filled groove is formed on the side of the edge of the explosion-proof aluminum sheet that contacts the steel cap. After the edge of the explosion-proof aluminum sheet is folded and attached to the steel cap, at this time, the edge of the explosion-proof aluminum sheet is extruded, so that the edge of the explosion-proof aluminum sheet feeds and fills towards the pre-filled groove, and finally the side of the edge of the explosion-proof aluminum sheet facing away from the steel cap gradually narrows and thins towards the welding center area to form a welding part. The narrowing and thinning of the welding part of the explosion-proof aluminum sheet of the present utility model utilizes the original production line, original stamping process and original extrusion process of the explosion-proof aluminum sheet, without adding additional equipment and unfamiliar processes such as cutting process. Therefore, on the premise of taking into account the simplicity of the production process and cost, the technical problem of poor arc welding easily occurring in the welding of the explosion-proof aluminum sheet and the steel cap of the battery cap body in the prior art is solved. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the battery cap body of the present utility model;

[0014] Figure 2 It is a schematic diagram of the connection between the explosion-proof aluminum sheet and the steel cap of the present utility model;

[0015] Figure 3 It is a schematic diagram of the explosion-proof aluminum sheet of the present utility model before flanging.

[0016] In the present utility model: 1 - explosion-proof aluminum sheet, 11 - welding part, 12 - pre-filled groove; 2 - steel cap. Detailed Embodiments

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] As Figures 1-3 shown, the present invention provides an explosion-proof aluminum sheet, which is welded to a steel cap. The part of the edge of the explosion-proof aluminum sheet 1 welded to the steel cap 2 forms a thinned welding part 11, so that the thickness of the welding part 11 is less than the main body thickness of the explosion-proof aluminum sheet 1.

[0019] For the explosion-proof aluminum sheet 1 of the present invention, analyzing the phenomenon that the welding part is prone to welding explosion, yellowing and blackening in the prior art, it is found that it is because the thickness of the explosion-proof aluminum sheet 1 is too thick, resulting in a large amount of energy required for welding. For example, the power of a laser welding machine needs to be adjusted to 100W to complete the welding. However, if the overall thickness of the explosion-proof aluminum sheet 1 is reduced, it will affect the structural strength of the finished battery cap. In view of this, the part of the edge of the explosion-proof aluminum sheet 1 of the present invention welded to the steel cap 2 forms a thinned welding part 11, and the thickness of the welding part 11 is less than the main body of the explosion-proof aluminum sheet 1, so that the energy required for welding is reduced. For example, when using the explosion-proof aluminum sheet 1 of the present invention for welding, the power of the laser welding machine can be adjusted to 80W to complete the welding, thereby improving the poor arc welding situation, reducing the occurrence of welding explosion, and avoiding yellowing and blackening at the welding part.

[0020] In a preferred embodiment of the present invention, one side of the welding part 11 of the explosion-proof aluminum sheet 1 is attached to the steel cap 2, and the other side of the welding part 11 gradually narrows towards the center area of the welding.

[0021] In a preferred embodiment of the present invention, the edge of the explosion-proof aluminum sheet 1 is thinned by stamping before the explosion-proof aluminum sheet 1 is folded, so as to form a pre-filled groove 12 on the side of the edge of the explosion-proof aluminum sheet 1 contacting the steel cap 2. After the edge of the explosion-proof aluminum sheet 1 is folded, it is attached to the steel cap 2 and is squeezed so that the edge of the explosion-proof aluminum sheet 1 feeds and fills towards the pre-filled groove 12, and finally the side of the edge of the explosion-proof aluminum sheet 1 facing away from the steel cap 2 gradually narrows and thins towards the center area of the welding to form the welding part 11.

[0022] For the explosion-proof aluminum sheet 1 of the present utility model, starting from actual production and taking into account the simplicity of the production process and cost, the edge of the explosion-proof aluminum sheet 1 is thinned by stamping before being folded. A pre-filled groove 12 is formed on the surface of the edge of the explosion-proof aluminum sheet 1 that contacts the steel cap 2. After the edge of the explosion-proof aluminum sheet 1 is folded, it adheres to the steel cap 2. At this time, the edge of the explosion-proof aluminum sheet 1 is extruded, so that the edge of the explosion-proof aluminum sheet 1 feeds and fills towards the pre-filled groove 12. Finally, the side of the edge of the explosion-proof aluminum sheet 1 facing away from the steel cap 2 gradually narrows and thins towards the welding center area to form a welding part 11. The narrowing and thinning of the welding part 11 of the explosion-proof aluminum sheet 1 of the present utility model utilizes the original production line, original stamping process and original extrusion process of the explosion-proof aluminum sheet 1, without adding additional equipment and unfamiliar processes, such as cutting processes. Thus, on the premise of taking into account the simplicity of the production process and cost, the technical problem that arc welding defects are likely to occur in the welding of the explosion-proof aluminum sheet 1 and the steel cap 2 of the battery cap body in the prior art is solved.

[0023] The present utility model also provides a battery cap body, including the above-mentioned explosion-proof aluminum sheet 1.

[0024] It should be understood that the specific embodiments described above are only used to explain the present utility model and are not used to limit the present utility model. Obvious changes or variations derived from the spirit of the present utility model are still within the protection scope of the present utility model.

Claims

1. An explosion-proof aluminum sheet (1) welded to a steel cap (2), characterized in that: The portion where the edge of the explosion-proof aluminum sheet (1) is welded to the steel cap (2) forms a thinned welding portion (11), so that the thickness of the welding portion (11) is smaller than the thickness of the main body of the explosion-proof aluminum sheet (1); One side of the welding portion (11) of the explosion-proof aluminum sheet (1) is attached to the steel cap (2), and the other side of the welding portion (11) gradually narrows toward the central area of ​​the welding.

2. The explosion-proof aluminum sheet (1) according to claim 1, characterized in that: The edge of the explosion-proof aluminum sheet (1) is punched and thinned before the explosion-proof aluminum sheet (1) is folded, so as to form a pre-filling groove (12) on the side where the edge of the explosion-proof aluminum sheet (1) contacts the steel cap (2). After being folded, the edge of the explosion-proof aluminum sheet (1) is attached to the steel cap (2) and is squeezed so that the edge of the explosion-proof aluminum sheet (1) moves toward the pre-filling groove (12) to fill the material, and finally the side of the edge of the explosion-proof aluminum sheet (1) facing away from the steel cap (2) gradually narrows and becomes thinner towards the central area of ​​welding to form the welding portion (11).

3. A battery cap, characterized in that: It comprises the explosion-proof aluminum sheet (1) as described in any one of claims 1 to 2.

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