A negative post, a top cover assembly and a secondary battery

Abstract

The application discloses a negative pole, a top cover assembly and a secondary battery, which comprises an aluminum pole and a copper plate. The bottom of the aluminum pole is provided with a mounting groove, the top of the copper plate is provided with an upper convex bump for being connected to the mounting groove, and the bottom of the copper plate is provided with a lower convex bump. The lower convex bump is also used for positioning when being assembled with a top cover sheet. The negative pole is used for being mounted on the top cover sheet through a sealing ring. The size of the lower convex bump is smaller than the size of a corresponding mounting hole of the negative pole, and the bottom surface of the lower convex bump is higher than the bottom surface of the top cover sheet. The negative pole, the top cover assembly and the secondary battery provided by the application are provided with a symmetrical structure of the upper convex bump and the lower convex bump, that is, the front and back surfaces are not distinguished, so that the process of identifying the front and back surfaces of the copper plate can be saved when the negative pole is assembled. The thickness of the lower convex bump is sufficient, and when the top cover sheet is assembled, the mold can realize higher-precision positioning of the negative pole by using the lower convex bump, so as to solve the problem of poor assembly precision of the negative pole and the top cover assembly in the prior art.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a negative electrode post, a top cover assembly, and a secondary battery. Background Technology

[0002] In the field of battery technology, existing negative electrode top cover assemblies typically consist of a negative electrode post, a sealing ring, a top cover sheet, and an injection-molded upper plastic layer. The negative electrode post employs a brazed composite structure of an aluminum post and a copper plate. In existing assembly processes, the upper plastic layer uses injection molding to fix the negative electrode post, sealing ring, and top cover sheet into a combined assembly. However, the following technical drawbacks still exist:

[0003] (1) The copper plate of the existing negative electrode post adopts an asymmetrical structure design. The top is provided with an upper bulge for brazing to the aluminum post, and the bottom is provided with a lower bulge for electrical connection. The thickness of the upper bulge is significantly greater than that of the lower bulge. This structure requires manual or visual inspection system to identify the front and back of the copper plate before brazing, which increases the assembly time of a single product and restricts the production efficiency of the negative electrode post.

[0004] (2) In the prior art, due to the thinness of the lower convex bulge, it cannot effectively cooperate with the positioning structure of the injection mold, resulting in a lack of radial constraint on the negative electrode post during injection molding. Simultaneously, the sealing ring, made of rubber or elastomer, has inherent elastic deformation characteristics that, combined with manufacturing tolerances, cause displacement deviations in the negative electrode post during press-fitting. This assembly deviation directly leads to a decrease in the reliability of the negative electrode post connection during battery module assembly, becoming a technical problem restricting the yield rate of secondary battery production. Utility Model Content

[0005] The purpose of this application is to provide a negative electrode post, a top cover assembly, and a secondary battery to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows:

[0007] This application provides a negative electrode post, including: an aluminum post and a copper plate. The bottom of the aluminum post is provided with a mounting groove, the top of the copper plate is provided with an upper protrusion for connecting to the mounting groove, and the bottom of the copper plate is provided with a lower protrusion. The upper and lower protrusions form a symmetrical structure. The lower protrusion is also used for positioning when assembled with the top cover plate.

[0008] The negative terminal is installed on the top cover plate via a sealing ring. The size of the lower protrusion is smaller than the size of the mounting hole corresponding to the negative terminal, and the bottom surface of the lower protrusion is higher than the bottom surface of the top cover plate.

[0009] In some embodiments, the aluminum pillar and the copper plate are brazed together.

[0010] This application embodiment also provides a top cover assembly, including: a top cover sheet, a sealing ring, an upper plastic layer, and a negative electrode post as described above; the negative electrode post is used to be mounted on the top cover sheet through the sealing ring, the size of the lower convex bulge is smaller than the size of the mounting hole corresponding to the negative electrode post, and the bottom surface of the lower convex bulge is higher than the bottom surface of the top cover sheet.

[0011] This application also provides a secondary battery, including the negative terminal post as described above, or including the top cover assembly as described above.

[0012] Compared with the prior art, the beneficial effects of the embodiments of this application are:

[0013] This application provides a negative terminal post, a top cover assembly, and a secondary battery. The upper and lower bulges of the copper plate on the terminal post are symmetrical, meaning there is no distinction between the front and back sides. This eliminates the need to identify the front and back sides of the copper plate during assembly of the negative terminal post, thus improving production efficiency. Furthermore, the thickness of the lower bulge is sufficient, allowing the mold to achieve higher precision positioning of the negative terminal post during assembly with the top cover sheet (e.g., the mold is equipped with a sleeve for fitting the positioning lower bulge). This solves the problem of poor assembly precision of the negative terminal post and top cover assembly in the prior art. Attached Figure Description

[0014] 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.

[0015] Figure 1 A cross-sectional view of the top cover assembly provided in an embodiment of this application is shown.

[0016] Figure 2 A cross-sectional view of the negative electrode post provided in an embodiment of this application is shown.

[0017] Figure 3 It shows Figure 2 The exploded view of the negative electrode column is shown.

[0018] Illustration:

[0019] 10. Negative terminal post; 11. Aluminum post; 12. Copper plate; 13. Lower convex bulge; 14. Upper convex bulge; 15. Mounting groove; 20. Sealing ring; 30. Top cover plate; 31. Mounting hole; 32. Bottom surface of top cover plate; 40. Top plastic. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0024] Please see Figures 1 to 3 As shown, this application embodiment provides a negative electrode post 10, including: an aluminum post 11 and a copper plate 12. The bottom of the aluminum post 11 is provided with a mounting groove 15, the top of the copper plate 12 is provided with an upper protrusion 14 for connecting to the mounting groove 15, and the bottom of the copper plate 12 is provided with a lower protrusion 13. The upper protrusion 14 and the lower protrusion 13 form a symmetrical structure. The lower protrusion 13 is also used for positioning when assembled with the top cover plate 30. The negative electrode post 10 is used to be mounted on the top cover plate 30 through a sealing ring 20. The size of the lower protrusion 13 is smaller than the size of the mounting hole 31 corresponding to the negative electrode post 10, and the bottom surface of the lower protrusion 13 is higher than the bottom surface 32 of the top cover plate.

[0025] During assembly, the sealing ring 20 is placed into the top cover plate 30, then the assembled negative electrode post 10 is placed on top, and finally, plastic 40 is injected to form an integral structure. During injection molding, the mold utilizes the lower protrusion 13 to achieve higher precision positioning of the negative electrode post 10, thereby improving positioning accuracy and reducing assembly deviations. For example, the mold is equipped with a sleeve that matches the lower protrusion 13. For example, when assembling the aluminum post 11 and the copper plate 12, since the upper protrusion 14 and the lower protrusion 13 are symmetrical structures, there is no need to distinguish between the front and back sides of the copper plate 12, thus improving assembly efficiency.

[0026] It should be noted that the size of the lower protrusion 13 is smaller than the size of the mounting hole 31 corresponding to the negative terminal post 10. This can be understood as the projection of the lower protrusion 13 on the top cover plate 30 falling into the range of the mounting hole 31, so that the sleeve of the mold has space to mate with the lower protrusion 13 to achieve positioning.

[0027] It should be noted that, since the lower convex 13 of this application is relatively thick, the lower convex 13 itself can have a positioning function, that is, it can cooperate with the injection mold to help fix the negative electrode post 10.

[0028] In some embodiments, the aluminum pillar 11 and the copper plate 12 are brazed together.

[0029] In some embodiments, a top cover assembly is also provided, including: a top cover sheet 30, a sealing ring 20, an upper plastic 40, and a negative terminal post 10 of any of the above embodiments; the negative terminal post 10 is used to be mounted on the top cover sheet 30 through the sealing ring 20, the size of the lower protrusion 13 is smaller than the size of the mounting hole 31 corresponding to the negative terminal post 10, and the bottom surface of the lower protrusion 13 is higher than the bottom surface 32 of the top cover sheet.

[0030] In some embodiments, a secondary battery is also provided, including the negative electrode post 10 of any of the above embodiments, or including the top cover assembly of the above embodiments, which also has the above-mentioned beneficial effects.

[0031] 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 negative electrode post, characterized in that, include: An aluminum column and a copper plate are provided. The bottom of the aluminum column is provided with a mounting groove, the top of the copper plate is provided with an upper protrusion for connecting to the mounting groove, and the bottom of the copper plate is provided with a lower protrusion. The upper protrusion and the lower protrusion form a symmetrical structure. The lower protrusion is also used for positioning when assembled with the top cover plate. The negative terminal is used to be installed on the top cover plate through a sealing ring. The size of the lower protrusion is smaller than the size of the mounting hole corresponding to the negative terminal, and the bottom surface of the lower protrusion is higher than the bottom surface of the top cover plate.

2. The negative electrode post according to claim 1, characterized in that, The aluminum column and the copper plate are brazed together.

3. A top cover assembly, characterized in that, include: The device includes a top cover, a sealing ring, an upper plastic layer, and a negative electrode post as described in claim 1 or 2; the negative electrode post is used to be mounted on the top cover via the sealing ring, the size of the lower convex bulge is smaller than the size of the mounting hole corresponding to the negative electrode post, and the bottom surface of the lower convex bulge is higher than the bottom surface of the top cover.

4. A secondary battery, characterized in that, It includes the negative terminal as described in claim 1 or 2, or the top cover assembly as described in claim 3.

Images