Pole, top cover assembly and secondary battery

Abstract

The application discloses a pole, a top cover assembly and a secondary battery, which comprises a pole body, the middle part of the bottom surface of the pole body is provided with a lower convex package, and the outer side of the lower convex package is provided with a positioning groove for positioning when assembled with a top cover sheet; wherein the pole body is used for being installed on the top cover sheet through a sealing ring, the size profile of the positioning groove is smaller than the size profile of the corresponding mounting hole of the pole body, and the bottom surface of the lower convex package is higher than the bottom surface of the top cover sheet. The pole, the top cover assembly and the secondary battery provided by the application have the following advantages: the outer side of the lower convex package of the pole is provided with a positioning groove for positioning when assembled, so that when assembled, the mold can realize higher-precision positioning of the pole by using the positioning groove, thereby solving the problem of poor assembly precision of the 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 an electrode post, a top cover assembly, and a secondary battery. Background Technology

[0002] In the field of battery technology, the top cover assembly of a battery, as a key structure for achieving conductivity and sealing between the cell and external circuitry, typically consists of terminals, sealing rings, a top cover sheet, and an injection-molded upper plastic layer. In existing assembly processes, the upper plastic layer uses injection molding to fix the terminals, sealing rings, and top cover sheet into a unified assembly. However, practice has shown that existing technology has the following technical defects: because the sealing ring is made of rubber or elastomer, its inherent elastic deformation characteristics, combined with manufacturing tolerances (which are relatively large), cause displacement deviations in the terminals during the press-fitting process. This assembly deviation directly leads to a decrease in the reliability of the terminal connection during battery module assembly, becoming a technical problem restricting the yield rate of rechargeable battery production. Utility Model Content

[0003] The purpose of this application is to provide an electrode post, a top cover assembly, and a secondary battery to solve the aforementioned technical problems.

[0004] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows:

[0005] This application provides an embodiment of an electrode post, comprising:

[0006] The pole body has a lower convex bulge in the middle of its bottom surface, and a positioning groove is provided on the outer side of the lower convex bulge for positioning when assembled with the top cover plate.

[0007] The electrode body is used to be installed on the top cover plate through a sealing ring. The size and contour of the positioning groove are smaller than the size and contour of the mounting hole corresponding to the electrode body, and the bottom surface of the lower convex bulge is higher than the bottom surface of the top cover plate.

[0008] In some embodiments, the positioning groove is disposed immediately adjacent to the lower convex bulge.

[0009] In some embodiments, there is a gap between the positioning groove and the lower protrusion.

[0010] In some embodiments, the positioning groove is an annular groove.

[0011] In some embodiments, when the electrode body is a positive electrode body, the electrode body is integrally formed.

[0012] In some embodiments, when the electrode body is a negative electrode body, the electrode body includes an aluminum column and a copper plate. The bottom of the aluminum column has a mounting groove, the top of the copper plate has an upper protrusion for mounting in the mounting groove, and the bottom of the copper plate has a lower protrusion and a positioning groove. Optionally, the aluminum column and the copper plate are connected by brazing.

[0013] In some embodiments, the thickness of the upper convex hull is greater than the thickness of the lower convex hull.

[0014] This application embodiment also provides a top cover assembly, including: a top cover sheet, a sealing ring, an upper plastic layer, and an electrode post as described above; the electrode post body is used to be mounted on the top cover sheet by the sealing ring, the size profile of the positioning groove is smaller than the size profile of the mounting hole corresponding to the electrode post body, and the bottom surface of the lower convex bulge is higher than the bottom surface of the top cover sheet.

[0015] This application also provides a secondary battery, including the terminals as described above or the top cover assembly as described above.

[0016] Compared with the prior art, the beneficial effects of the embodiments of this application are:

[0017] This application provides an embodiment of an electrode post, a top cover assembly, and a secondary battery. The lower bulge of the electrode post has a positioning groove on its outer side for positioning during assembly. The size and contour of the positioning groove are smaller than the size and contour of the mounting hole corresponding to the electrode post body, and the bottom surface of the lower bulge is higher than the bottom surface of the top cover sheet. This allows the mold to use the positioning groove to achieve higher precision positioning of the electrode post during assembly, thereby solving the problem of poor assembly accuracy of the electrode post and top cover assembly in the prior art. Attached Figure Description

[0018] 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.

[0019] Figure 1 A cross-sectional view of the top cover assembly provided in an embodiment of this application is shown.

[0020] Figure 2 It shows Figure 1 Exploded view.

[0021] Figure 3 It shows Figure 1 Another exploded view.

[0022] Illustration:

[0023] 10. Pole post body; 11. Aluminum post; 12. Copper plate; 13. Lower convex bulge; 14. Positioning groove; 20. Sealing ring; 30. Top cover plate; 31. Mounting hole; 32. Bottom surface of top cover plate; 40. Upper plastic. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0028] Please see Figures 1 to 3 As shown, this application embodiment provides an electrode post, including: an electrode post body 10, the bottom surface of the electrode post body 10 has a lower protrusion 13 in the middle, and the outer side of the lower protrusion 13 is provided with a positioning groove 14 for positioning when assembled with the top cover plate 30.

[0029] The pole body 10 is used to be installed on the top cover plate 30 through the sealing ring 20. The size and contour of the positioning groove 14 are smaller than the size and contour of the mounting hole 31 corresponding to the pole body 10, and the bottom surface of the lower protrusion 13 is higher than the bottom surface 32 of the top cover plate.

[0030] During assembly, the sealing ring 20 is placed into the top cover plate 30, then the electrode body 10 is placed on top, and finally the plastic 40 is injected to form an integral structure. During the injection molding process, the mold positions the electrode through the positioning groove 14 to improve positioning accuracy and reduce assembly deviation. For example, the mold is provided with raised ribs that match the positioning groove 14.

[0031] It should be noted that the size and outline of the positioning groove 14 are smaller than the size and outline of the mounting hole 31 corresponding to the pole body 10. This can be understood as the projection of the positioning groove 14 on the top cover plate 30 falling into the range of the mounting hole 31, so that the rib of the mold has space to mate with the positioning groove 14 to achieve positioning.

[0032] It should be noted that, since the lower convex 13 of this application is relatively thin, the lower convex 13 itself is difficult to have a positioning function, that is, it cannot cooperate with the injection mold to assist in fixing the pole.

[0033] In some embodiments, the positioning groove 14 is disposed immediately adjacent to the lower protrusion 13, such as... Figures 1 to 3 As shown.

[0034] In some embodiments, there is a gap between the positioning groove 14 and the lower protrusion 13, but it is still necessary to ensure that the size profile of the positioning groove 14 is smaller than the size profile of the mounting hole 31 corresponding to the pole body 10.

[0035] This application does not specifically limit the number or shape of the positioning grooves 14. For example, the grooves can be square grooves, round grooves, annular grooves, or arc-shaped grooves. For example, multiple square grooves, or multiple round grooves, or multiple arc-shaped grooves are spaced apart. For example, multiple annular grooves are arranged concentrically.

[0036] In some embodiments, the positioning groove 14 is an annular groove, such as... Figure 3 As shown.

[0037] In some embodiments, when the electrode body 10 is a positive electrode, the electrode body 10 is integrally formed.

[0038] In some embodiments, when the electrode body 10 is a negative electrode, the electrode body 10 includes an aluminum column 11 and a copper plate 12. The bottom of the aluminum column 11 is provided with a mounting groove, the top of the copper plate 12 is provided with an upper protrusion for mounting in the mounting groove, and the bottom of the copper plate 12 is formed with a lower protrusion 13 and a positioning groove 14.

[0039] In some embodiments, the thickness of the upper convex hull is greater than the thickness of the lower convex hull 13.

[0040] In some embodiments, the top cover assembly includes: a top cover sheet 30, a sealing ring 20, an upper plastic 40, and an electrode post of any of the above embodiments; the electrode post body 10 is used to be mounted on the top cover sheet 30 by the sealing ring 20, the size profile of the positioning groove 14 is smaller than the size profile of the mounting hole 31 corresponding to the electrode post body 10, and the bottom surface of the lower protrusion 13 is higher than the bottom surface 32 of the top cover sheet.

[0041] In some embodiments, the secondary battery includes the terminal post or the top cover assembly of any of the above embodiments, and also has the above-mentioned beneficial effects.

[0042] 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. An electrode post, characterized in that, include: The electrode body has a lower convex bulge in the middle of its bottom surface, and a positioning groove is provided on the outer side of the lower convex bulge for positioning when assembled with the top cover plate. The pole body is used to be installed on the top cover plate by a sealing ring. The size and contour of the positioning groove are smaller than the size and contour of the mounting hole corresponding to the pole body, and the bottom surface of the lower convex bulge is higher than the bottom surface of the top cover plate.

2. The pole post according to claim 1, characterized in that, The positioning groove is located adjacent to the lower convex bulge.

3. The pole post according to claim 1, characterized in that, There is a gap between the positioning groove and the lower convex bulge.

4. The pole post according to claim 1, characterized in that, The positioning groove is an annular groove.

5. The pole post according to claim 1, characterized in that, When the electrode body is a positive electrode, the electrode body is integrally formed.

6. The pole post according to claim 1, characterized in that, When the electrode body is a negative electrode body, the electrode body includes an aluminum column and a copper plate. The bottom of the aluminum column is provided with an installation groove, the top of the copper plate is provided with an upper protrusion for mounting in the installation groove, and the bottom of the copper plate is formed with the lower protrusion and the positioning groove.

7. The pole post according to claim 6, characterized in that, The thickness of the upper convex hull is greater than the thickness of the lower convex hull.

8. A top cover assembly, characterized in that, include: The device comprises a top cover, a sealing ring, an upper plastic layer, and an electrode post as described in any one of claims 1 to 7; the electrode post body is used to be mounted on the top cover via the sealing ring, the dimensional profile of the positioning groove is smaller than the dimensional profile of the mounting hole corresponding to the electrode post body, and the bottom surface of the lower bulge is higher than the bottom surface of the top cover.

9. A secondary battery, characterized in that, Includes the pole as described in any one of claims 1 to 7 or the top cover assembly as described in claim 8.

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