Cylindrical battery and negative electrode connecting piece thereof

Abstract

The utility model discloses a cylindrical battery and a negative electrode connecting piece thereof, the negative electrode connecting piece comprises an integrally formed connecting piece body, the connecting piece body is provided with a plurality of annular fan-shaped structures protruding towards a battery cell negative electrode, and the plurality of annular fan-shaped structures are distributed at intervals; through grooves are formed along the outer arc edge and the two radial edges of the annular fan-shaped structure to form an annular fan-shaped connecting part, and the annular fan-shaped connecting part is used for being welded on the bottom surface of the negative electrode of the battery cell. According to the cylindrical battery and the negative electrode connecting piece thereof provided by the embodiment of the invention, the annular fan-shaped connecting parts are arranged at intervals, so that a welding area is effectively dispersed; the through grooves are formed between the adjacent annular fan-shaped connecting parts to form physical partitions, stress transmission in the welding process is reduced, welding deformation is restrained, and therefore the welding quality and the yield are improved, and the connection reliability is enhanced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a cylindrical battery and a negative electrode connecting sheet thereof. BACKGROUND

[0002] A conventional cylindrical battery is generally composed of a shell, an inner built-in battery cell and a top cover, and the shell bottom is provided with a negative electrode connecting sheet. The negative electrode connecting sheet is fixed to the negative electrode of the battery cell by a welding process to realize electrical connection. However, the conventional negative electrode connecting sheet adopts a planar structure design matched with the bottom surface of the negative electrode of the battery cell, and has the following technical defects:

[0003] Under the action of the stress generated by welding, large deformation is prone to occur, and the deformation causes a virtual welding area to appear at the welding interface, affecting the welding reliability. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a cylindrical battery and a negative electrode connecting sheet thereof, and aims to solve the above technical problems.

[0005] To achieve the above application purposes, the technical solutions adopted by the application are as follows:

[0006] The application provides a negative electrode connecting sheet of a cylindrical battery, which comprises:

[0007] The connecting sheet body is integrally formed and has a plurality of annular sector structures protruding towards the negative electrode of the battery cell, and the plurality of annular sector structures are distributed at intervals.

[0008] A through groove is formed along the outer arc edge and the two radial edges of the annular sector structure to form an annular sector connecting part, and the annular sector connecting part is used for welding to the bottom surface of the negative electrode of the battery cell.

[0009] In some embodiments, the middle part of the connecting sheet body has a protruding part protruding away from the negative electrode of the battery cell, and an insulating part is further arranged between the bottom of the shell of the cylindrical battery and the connecting sheet body, and the middle part of the insulating part is provided with a through hole matched with the protruding part.

[0010] In some embodiments, a plurality of positioning holes are further arranged between the two adjacent annular sector structures on the connecting sheet body.

[0011] In some embodiments, the number of the annular sector structures is three.

[0012] The application further provides a cylindrical battery comprising the above negative electrode connecting sheet.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] The cylindrical battery and the negative electrode connecting piece thereof provided by the embodiment of the present application effectively disperse the welding area by arranging the annular fan-shaped connecting parts at intervals; the through grooves are arranged between the adjacent annular fan-shaped connecting parts to form a physical partition, thereby reducing the stress transmission in the welding process and inhibiting the welding deformation, so as to improve the welding quality and the yield, and enhance the connection reliability. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0016] Figure 1 A top view of the negative electrode connecting piece of the cylindrical battery provided by the embodiment of the present application is shown;

[0017] Figure 2 A bottom view of the negative electrode connecting piece of the cylindrical battery provided by the embodiment of the present application is shown;

[0018] Figure 3 A structure schematic view of the negative electrode connecting piece and the insulating piece of the cylindrical battery provided by the embodiment of the present application is shown;

[0019] Figure 4 A bottom sectional view of the cylindrical battery provided by the embodiment of the present application is shown.

[0020] ILLUSTRATIONS:

[0021] 10, connecting piece body; 11, annular fan-shaped structure; 12, through groove; 13, annular fan-shaped connecting part; 14, protruding part; 15, positioning hole; 20, insulating piece; 21, through hole; 30, battery cell; 40, shell. DETAILED DESCRIPTION

[0022] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects more clearly, the present application will be further described in detail in combination with the drawings and the 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.

[0023] 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.

[0024] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0025] In order to illustrate the technical solutions described in the present application, the following will be described by specific embodiments.

[0026] Please refer to Figures 1 to 3 As shown in the figure, the negative connection piece of the cylindrical battery provided by the embodiments of the present application comprises: a one-piece connection piece body 10, the connection piece body 10 has a plurality of annular sector structures 11 protruding towards the negative electrode of the battery cell, and the plurality of annular sector structures 11 are distributed at intervals.

[0027] A through slot 12 is provided along the outer arc edge and the two radial edges of the annular sector structure 11 to form an annular sector connection part 13, and the annular sector connection part 13 is used for welding to the bottom surface of the negative electrode of the battery cell.

[0028] The above-mentioned negative connection piece of the cylindrical battery, by arranging the annular sector connection parts 13 at intervals, effectively disperses the welding area; the through slot 12 is provided between the adjacent annular sector connection parts 13 to form a physical partition, reduces the stress transmission in the welding process, and suppresses the welding deformation, thereby improving the welding quality and the yield rate, and enhancing the connection reliability.

[0029] In some embodiments of the present application, the middle part of the connection piece body 10 has a protruding part 14 protruding away from the negative electrode of the battery cell, and an insulating part 20 is further provided between the bottom of the shell of the cylindrical battery and the connection piece body 10, and the middle of the insulating part 20 is provided with a through hole 21 matched with the protruding part 14.

[0030] In some embodiments of the present application, a plurality of positioning holes 15 are further provided between the two adjacent annular sector structures 11 on the connection piece body 10.

[0031] In some embodiments of the present application, the number of annular sector structures 11 is three.

[0032] In some embodiments of the present application, a cylindrical battery is further provided, comprising the above-mentioned negative connection piece.

[0033] For example, please refer to Figure 4 As shown in the figure, the cylindrical battery comprises a shell 40, the shell 40 is provided with a battery cell 30, the bottom surface of the negative electrode of the battery cell 30 is connected and fixed with the annular sector connection part 13 of the negative connection piece, and the protruding part 14 of the negative connection piece is arranged through the through hole 21.

[0034] The cylindrical battery effectively disperses the welding area by arranging the annular fan-shaped connecting parts 13 at intervals, and reduces stress transmission and welding deformation in the welding process by opening a through slot 12 between adjacent annular fan-shaped connecting parts 13 to form a physical partition, thereby improving welding quality and yield and enhancing connection reliability.

[0035] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A negative electrode tab of a cylindrical battery, characterized by comprising: The application relates to a negative electrode connecting sheet for a cylindrical battery. The connecting sheet body has a plurality of annular fan-shaped structures protruding towards a negative electrode of a battery cell, and the annular fan-shaped structures are distributed at intervals. Grooves are formed along the outer arc edges and two radial edges of the annular fan-shaped structures to form annular fan-shaped connecting parts which are used for welding to the bottom surface of the negative electrode of the battery cell.

2. The negative tab of a cylindrical battery according to claim 1, wherein The middle part of the connecting sheet body has a protruding part which protrudes away from the negative electrode of the battery cell, and an insulating part is arranged between the bottom of the shell of the cylindrical battery and the connecting sheet body, and the middle part of the insulating part is provided with a through hole which matches the protruding part.

3. The negative tab of a cylindrical battery according to claim 1, wherein A plurality of positioning holes are formed between two adjacent annular fan-shaped structures on the connecting sheet body.

4. The negative tab of a cylindrical battery according to claim 1, wherein The number of the annular fan-shaped structures is three.

5. A cylindrical battery, characterized by The application further relates to a negative electrode connecting sheet for a cylindrical battery, which comprises the negative electrode connecting sheet as claimed in any one of claims 1 to 4.

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