Brazing pole, top cover assembly and secondary battery

Abstract

The utility model discloses a brazing pole, a top cover assembly and a secondary battery. The brazing pole comprises a copper piece, a filling space used for being filled with a brazing material is formed between the aluminum part and the copper part, and the copper part and the aluminum part are connected through brazing; wherein the area of the copper piece is larger than that of the aluminum piece. According to the brazing pole, the top cover assembly and the secondary battery provided by the embodiment of the invention, the filling space for filling the brazing material is formed between the copper piece and the aluminum piece, so that when the copper piece and the aluminum piece are connected and fixed through brazing, the process is simpler, and the cost is reduced; and the optimized connection structure can improve the connection tightness and long-term reliability between the copper piece and the aluminum piece.

Description

Technical Field

[0001] This application belongs to the technical field of secondary batteries, and particularly relates to a brazed pole, a top cover assembly, and a secondary battery. Background Art

[0002] In the rapidly developing field of secondary battery technology, the optimization and improvement of battery components are of crucial significance for enhancing the overall performance of the battery, reducing costs, and enhancing safety. Among them, the pole, as a key component of the battery connection system, its design and manufacturing process directly affect the energy transfer efficiency and long-term reliability of the battery.

[0003] In the related art, the pole is designed by combining an aluminum column and a copper plate, aiming to utilize the light weight property of aluminum and the excellent electrical conductivity of copper. To achieve an effective connection between the two, the copper plate is ingeniously designed with a pitted structure, while the aluminum column is correspondingly configured with a convex bulge, and the two are tightly combined through a precise brazing process. Although this design realizes the connection of different metal materials to a certain extent, it still faces many challenges in practical applications.

[0004] First, from the perspective of the production process, the manufacturing process of this brazed pole is relatively complex, involving multiple precision machining steps, such as the precise forming of pits and convex bulges, the selection and coating of brazing materials, and the control of temperature and time during the high-temperature brazing process. This not only increases the production cost but also raises the requirements for production equipment and process control.

[0005] Secondly, in terms of the connection effect, although the brazing process is adopted, due to the inherent physical and chemical property differences between aluminum and copper, such as different thermal expansion coefficients, stress concentration or microcracks may occur at the connection interface between the aluminum column and the copper plate during high-temperature brazing and subsequent use, thus affecting the tightness and long-term stability of the connection. Summary of the Utility Model

[0006] In view of this, this application provides a brazed pole, a top cover assembly, and a secondary battery, aiming to simplify the pole production process, optimize the connection structure, and significantly improve the connection tightness and long-term reliability between the aluminum column and the copper plate to meet the urgent needs of modern secondary battery technology for high performance, low cost, and high safety.

[0007] To achieve the above application objectives, the technical solutions adopted in this application are as follows:

[0008] In the first aspect of the embodiments of this application, a brazed pole is provided, including:

[0009] A copper part;

[0010] An aluminum part, a filling space for filling a brazing material is formed between the aluminum part and a copper part, and the copper part and the aluminum part are connected by brazing;

[0011] Among them, the area of the copper part is larger than that of the aluminum part.

[0012] Optionally, the surface of the aluminum part facing the copper part is provided with a groove, and the filling space is formed through the groove.

[0013] Optionally, the surface of the aluminum part facing the copper part is provided with a first corrugated surface, and / or the surface of the copper part facing the aluminum part is provided with a second corrugated surface, and the filling space is formed through the first corrugated surface and / or the second corrugated surface.

[0014] Optionally, at least one annular structure or columnar structure is further protruded in the groove.

[0015] Optionally, multiple annular structures share the same center, or multiple columnar structures are distributed in a grid pattern.

[0016] Optionally, the groove is a cylindrical cavity.

[0017] Optionally, the surface of the copper part facing the aluminum part is further provided with a positioning groove, and the side wall of the groove is used to be embedded in the positioning groove.

[0018] In the second aspect of the embodiments of the present application, a top cover assembly is provided, including the brazing pole column provided in the first aspect above and a top cover sheet for installing the brazing pole column.

[0019] In the third aspect of the embodiments of the present application, a secondary battery is provided, including the brazing pole column provided in the first aspect above or including the top cover assembly provided in the second aspect above.

[0020] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0021] A brazing pole column, a top cover assembly and a secondary battery provided by the embodiments of the present application, by forming a filling space for filling a brazing material between the copper part and the aluminum part, when the copper part and the aluminum part are fixedly connected by brazing, not only the process is simpler, but also the optimized connection structure can improve the connection tightness and long-term reliability between the copper part and the aluminum part. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1Shows a schematic structural diagram of a brazed pole provided by an embodiment of the present application;

[0024] Figure 2 Shows a first exemplary exploded view of a brazed pole provided by an embodiment of the present application;

[0025] Figure 3 Shows a second exemplary exploded view of a brazed pole provided by an embodiment of the present application;

[0026] Figure 4 Shows a third exemplary exploded view of a brazed pole provided by an embodiment of the present application;

[0027] Figure 5 Shows a fourth exemplary exploded view of a brazed pole provided by an embodiment of the present application;

[0028] Figure 6 Shows a cross-sectional view of a brazed pole provided by an embodiment of the present application;

[0029] Figure 7 Shows another cross-sectional view of a brazed pole provided by an embodiment of the present application.

[0030] 10. Copper part; 11. Positioning groove; 20. Aluminum part; 21. Groove; 22. Ring structure; 23. Columnar structure; 30. Brazing material. Detailed implementation manners

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0034] In order to illustrate the technical solutions described in the present application, the following will be described through specific embodiments.

[0035] Please refer toFigure 1 , Figure 2 and Figure 6 As shown in Figure 1 , Figure 2 and Figure 6 , an embodiment of the present application provides a brazed pole piece, including: a copper part 10; an aluminum part 20, a filling space for filling a brazing material is formed between the aluminum part 20 and the copper part 10, and the copper part 10 and the aluminum part 20 are connected by brazing. Among them, the area of the copper part 10 is larger than the area of the aluminum part 20.

[0036] The embodiment of the present application does not specifically limit the overall shape of the copper part 10 and the aluminum part 20, and those skilled in the art can set it according to needs. As an example, the copper part 10 is plate-shaped and the aluminum part 20 is columnar.

[0037] As an example, the brazing process can be carried out by high-temperature heating or by high-frequency vibration.

[0038] For the above-mentioned brazed pole piece, the copper part 10 and the aluminum part 20 connected by brazing can form a composite pole piece, which not only has a simpler process, but also the optimized connection structure can improve the connection tightness and long-term reliability between the copper part 10 and the aluminum part 20.

[0039] In some embodiments, a groove 21 is provided on the surface of the aluminum part 20 facing the copper part 10, and the filling space is formed through the groove 21. For example, a filling space for filling the brazing material 30 is formed between the surface of the copper part 10 facing the aluminum part 20 and the groove 21.

[0040] For the above-mentioned brazed pole piece, by providing the groove 21 on the bottom surface of the aluminum part 20, a filling space for filling the brazing material 30 is formed between the surface of the copper part 10 facing the aluminum part 20 and the groove 21. In this way, when the copper part 10 and the aluminum part 20 are fixedly connected by brazing, not only the process is simpler, but also the optimized connection structure can improve the connection tightness and long-term reliability between the copper part 10 and the aluminum part 20.

[0041] In some embodiments of the present application, a first corrugated surface is provided on the surface of the aluminum part 20 facing the copper part 10, and / or a second corrugated surface is provided on the surface of the copper part 10 facing the aluminum part 20, and the filling space is formed through the first corrugated surface and / or the second corrugated surface. It should be understood that the corrugated surface can further increase the contact connection area between the copper part 10 and the aluminum part 20, thereby significantly improving the connection tightness and long-term reliability between the copper part 10 and the aluminum part 20.

[0042] In some embodiments of the present application, please refer to Figure 3 and Figure 4 As shown, at least one annular structure 22 or columnar structure 23 further protrudes in the groove 21. For example, as Figure 3 shown, multiple annular structures 22 are concentric. Another example is, as Figure 4As shown, a plurality of columnar structures 23 are distributed in a grid pattern.

[0043] It should be understood that the annular structure 22 or the columnar structure 23 can further increase the contact connection area between the copper part 10 and the aluminum part 20, thereby significantly improving the connection tightness and long-term reliability between the copper part 10 and the aluminum part 20.

[0044] As an alternative to any of the above embodiments, the groove 21 is a cylindrical cavity. As another alternative to any of the above embodiments, the groove 21 can also be a cubic cavity, a rectangular parallelepiped cavity, or a cavity of other shapes.

[0045] Please refer to Figure 5 and Figure 7 As shown, in some embodiments of the present application, a positioning groove 11 is further formed on the surface of the copper part 10 facing the aluminum part 20, and the side wall of the groove 21 is used to be embedded in the positioning groove 11. It should be understood that the positioning groove 11 can prevent the aluminum part 20 from moving radially, thereby improving the connection reliability between the copper part 10 and the aluminum part 20.

[0046] In some embodiments of the present application, a top cover assembly is further provided, including the brazed pole column provided in any of the above embodiments and a top cover sheet for mounting the brazed pole column.

[0047] In some embodiments of the present application, a secondary battery is further provided, including the brazed pole column provided in any of the above embodiments or including the top cover assembly provided in the above embodiments. Optionally, the secondary battery is a lithium-ion battery.

[0048] The above-mentioned top cover assembly and secondary battery also have the above-mentioned beneficial effects, that is: the copper part 10 and the aluminum part 20 connected by brazing can form a composite pole column, which not only simplifies the process, but also the optimized connection structure can improve the connection tightness and long-term reliability between the copper part 10 and the aluminum part 20.

[0049] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A brazed terminal post, characterized in that, Comprising: Copper part; Aluminum part, a filling space for filling brazing material is formed between the aluminum part and the copper part, and the copper part and the aluminum part are connected by brazing; Wherein, the area of the copper part is larger than the area of the aluminum part.

2. The brazed terminal pole according to claim 1, characterized in that, The surface of the aluminum part facing the copper part is provided with a groove, and the filling space is formed through the groove.

3. The brazed terminal according to claim 1, characterized in that, The surface of the aluminum part facing the copper part is provided with a first corrugated surface, and / or the surface of the copper part facing the aluminum part is provided with a second corrugated surface, and the filling space is formed through the first corrugated surface and / or the second corrugated surface.

4. A brazed terminal according to claim 2, characterized in that, At least one annular structure or columnar structure protrudes in the groove.

5. A brazed terminal according to claim 4, characterized in that, A plurality of the annular structures share the same center, or a plurality of the columnar structures are distributed in a grid pattern.

6. A brazed terminal according to claim 2, wherein, The groove is a cylindrical cavity.

7. The brazed terminal post according to claim 2, wherein, The surface of the copper part facing the aluminum part is further provided with a positioning groove, and the side wall of the groove is used for being embedded into the positioning groove.

8. A top cover assembly, characterized in that, Comprising the brazing pole column according to any one of claims 1 to 7 and a top cover piece for installing the brazing pole column.

9. A secondary battery, characterized in that, Comprising the brazing pole column according to any one of claims 1 to 7 or comprising the top cover assembly according to claim 8.

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