Copper-aluminum composite pole, top cover assembly and secondary battery

Abstract

The utility model discloses a copper-aluminum composite pole, a top cover assembly and a secondary battery, the copper-aluminum composite pole comprises an aluminum pole, the bottom of the aluminum pole is provided with a groove, and the side surface of the aluminum pole is provided with a plurality of anti-rotation bosses distributed at intervals; the top of the copper plate is provided with a convex hull corresponding to the groove, and the copper plate extends outwards around the convex hull to form a flange structure. The copper-aluminum composite pole is manufactured by brazing, so that the waste recovery difficulty can be reduced, the resource utilization efficiency can be improved, the independent aluminum pole and the independent copper plate can be independently manufactured, and the thickness of the flange structure of the copper plate can be better controlled, so that the use of raw materials is reduced, and the manufacturing cost is reduced. Meanwhile, the anti-rotation boss can be arranged on the side face of the aluminum column, the copper-aluminum composite pole column connected to other battery assemblies is prevented from rotating, the structural stability is improved, the anti-rotation boss is not arranged on a copper plate, and the influence of the anti-rotation boss on the battery performance can be reduced.

Description

Technical Field

[0001] This application belongs to the field of secondary battery technology, and particularly relates to a copper-aluminum composite electrode, a top cover assembly, and a secondary battery. Background Technology

[0002] In the field of secondary battery technology, the manufacturing of negative terminals has traditionally relied on stamping processes. Copper-aluminum composite plates are used as raw materials, and after stamping, they are formed into copper-aluminum composite terminals. Typically, finished copper-aluminum composite terminals are fitted with flange structures, which, through specific design features, enhance the connection stability and reliability of the terminals.

[0003] Specifically, in the battery cover, battery cover preparation method and power battery disclosed in Chinese invention patent application CN118412595A, paragraph

[0050] of the specification describes in detail a structural feature of the terminal post: "In one embodiment, the lower outer diameter of the terminal post is larger than the upper outer diameter of the terminal post to form a stepped end face between the two." This design makes the lower part of the terminal post form a protruding flange structure, which not only enhances the stability of the structure, but also facilitates reliable connection with other battery components.

[0004] However, while the aforementioned copper-aluminum composite pole design demonstrates certain advantages in production applications, the problems encountered during its manufacturing process cannot be ignored. Because the pole is directly fabricated from the copper-aluminum composite plate using a stamping method, the thickness of its flange structure is difficult to reduce, resulting in high manufacturing costs. Furthermore, the manufacturing process often generates a large amount of waste. Adding to the complexity, this waste contains a mixture of copper and aluminum components, posing a significant challenge to subsequent waste sorting and recycling. This not only increases recycling costs but may also reduce resource utilization efficiency due to the mixed materials.

[0005] In summary, while the copper-aluminum composite electrode in the existing technology meets the functional requirements of battery modules, there is still room for improvement in terms of cost control and waste recycling. Utility Model Content

[0006] One of the purposes of this application is to provide a copper-aluminum composite electrode post, a top cover assembly, and a secondary battery. The copper-aluminum composite electrode post is made of an independent aluminum post and an independent copper plate brazed together, and the thickness of the flange structure of the copper plate can be effectively controlled, thereby reducing manufacturing costs and facilitating waste recycling.

[0007] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows:

[0008] This application provides a copper-aluminum composite electrode post, comprising:

[0009] The aluminum column has a groove at the bottom and multiple anti-rotation protrusions spaced apart on the side.

[0010] The copper plate has a convex bulge on its top corresponding to the groove. The copper plate extends outward around the convex bulge to form a flange structure. The top surface of the copper plate and the bottom surface of the aluminum column are fixedly connected by brazing.

[0011] Optionally, the outer diameter of the flange structure is larger than the overall outer diameter of the multiple anti-rotation bosses.

[0012] Optionally, the bottom surface of the copper plate is flat.

[0013] This application embodiment also provides a top cover assembly, including the aforementioned copper-aluminum composite pole and top cover sheet, wherein the copper-aluminum composite pole is used to be mounted on the top cover sheet.

[0014] This application also provides a secondary battery, including the copper-aluminum composite electrode as described above or the top cover assembly as described above.

[0015] Compared with the prior art, the beneficial effects of the embodiments of this application are:

[0016] This application provides a copper-aluminum composite electrode post, which uses an independent aluminum column and an independent copper plate, and is manufactured by brazing. This not only reduces the difficulty of waste recycling and improves resource utilization efficiency, but also allows for the separate manufacturing of the aluminum column and copper plate. The thickness of the flange structure of the copper plate can be better controlled, thereby effectively controlling the flange structure thickness, reducing raw material usage, and lowering manufacturing costs. Simultaneously, an anti-rotation protrusion can be placed on the side of the aluminum column to prevent the copper-aluminum composite electrode post from rotating after being connected to other battery components, improving structural stability. Furthermore, since the anti-rotation protrusion is not located on the copper plate, its impact on battery performance can be reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This illustration shows a structural schematic diagram of a copper-aluminum composite pole provided in an embodiment of this application;

[0019] Figure 2 It shows Figure 1 The diagram shows an exploded view of a copper-aluminum composite electrode.

[0020] Figure 3 It shows Figure 1 The diagram shows another exploded view of a copper-aluminum composite pole.

[0021] Illustration:

[0022] 10. Aluminum column; 11. Groove; 12. Anti-rotation boss; 20. Copper plate; 21. Protrusion; 22. Flange structure; 30. Brazing filler metal. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0026] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0027] Please see Figures 1 to 3 As shown in the figure, this application provides a copper-aluminum composite pole, including an aluminum pole 10 and a copper plate 20, which are fixedly connected by brazing with brazing filler metal 30.

[0028] Specifically, the aluminum column 10 has a groove 11 at its bottom and multiple anti-rotation bosses 12 spaced apart on its side. The copper plate 20 has a protrusion 21 corresponding to the groove 11 at its top, and a flange structure 22 extends outward around the protrusion 21. The top surface of the copper plate 20 and the bottom surface of the aluminum column 10 are fixedly connected by brazing. Specifically, the groove 11 and the protrusion 21, as well as the anti-rotation bosses 12 and the flange structure 22, are all fixedly connected by brazing using brazing filler metal 30.

[0029] Optionally, the outer diameter of the flange structure 22 is larger than the overall outer diameter of the plurality of anti-rotation bosses 12.

[0030] Optionally, the bottom surface of the copper plate 20 is flat.

[0031] This application provides a copper-aluminum composite electrode post, which uses an independent aluminum column 10 and an independent copper plate 20, and is manufactured by brazing. This not only reduces the difficulty of waste recycling and improves resource utilization efficiency, but also allows for the separate manufacturing of the aluminum column 10 and the copper plate 20. The thickness of the flange structure 22 of the copper plate 20 can be better controlled, thereby effectively controlling the thickness of the flange structure 22, reducing the use of raw materials, and lowering manufacturing costs. Simultaneously, an anti-rotation protrusion 12 can be placed on the side of the aluminum column 10 to prevent the copper-aluminum composite electrode post from rotating after being connected to other battery components, improving structural stability. Furthermore, since the anti-rotation protrusion 12 is not located on the copper plate 20, its impact on battery performance can be reduced.

[0032] In another embodiment of this application, a top cover assembly is also provided, including the aforementioned copper-aluminum composite electrode post and a top cover sheet, wherein the copper-aluminum composite electrode post is used to be mounted on the top cover sheet. As an example, when the copper-aluminum composite electrode post is mounted on the top cover sheet using plastic, the anti-rotation boss 12 can form a snap-fit ​​connection with the plastic to prevent the electrode post from rotating.

[0033] In another embodiment of this application, a secondary battery is also provided, including the aforementioned copper-aluminum composite electrode post or the aforementioned top cover assembly. As an example, the secondary battery further includes an aluminum casing, with the top cover assembly and the aluminum casing sealed together. As an example, the secondary battery is a lithium-ion battery.

[0034] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A copper-aluminum composite electrode, characterized in that, include: An aluminum column, the bottom of which has a groove, and the side of which has multiple spaced anti-rotation protrusions; A copper plate, the top of which has a protrusion corresponding to the groove, the copper plate extending outward around the protrusion to form a flange structure, and the top surface of the copper plate and the bottom surface of the aluminum column are fixedly connected by brazing.

2. The copper-aluminum composite electrode according to claim 1, characterized in that, The outer diameter of the flange structure is larger than the outer diameter of the plurality of anti-rotation bosses as a whole.

3. The copper-aluminum composite electrode according to claim 1, characterized in that, The bottom surface of the copper plate is flat.

4. A top cover assembly, characterized in that, The invention includes the copper-aluminum composite electrode and top cover plate as described in any one of claims 1 to 3, wherein the copper-aluminum composite electrode is used to be mounted on the top cover plate.

5. A secondary battery, characterized in that, It includes the copper-aluminum composite pole as described in any one of claims 1 to 3 or the top cover assembly as described in claim 4.

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