Battery terminal and battery

Abstract

The utility model discloses a battery terminal which comprises a terminal main body fixedly connected with one end of a battery cell, an annular groove is arranged in the middle of the terminal main body, an insulating washer is sleeved on the annular groove, the terminal main body is connected with a shell through the insulating washer, and the outer edge of the insulating washer is connected with the inner wall of the shell in a sealing and insulating manner. The terminal is directly connected with the battery cell, a current collecting plate assembly is removed, the terminal is directly connected with the battery cell tab, switching through a current collecting plate is replaced, the material cost is reduced, the assembly process is simplified, meanwhile, the internal space of the battery shell is released, and electrolyte infiltration and inventory improvement are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically a battery terminal and a battery. Background Technology

[0002] The mainstream technical approach for connecting existing cylindrical battery cell structures involves flattening the bare cell tabs, welding the flattened tabs to the current collector using laser welding, and then connecting the current collector to the battery cell and the steel shell or positive terminal using through welding or peripheral welding. While the use of the current collector solves the welding problem between the tabs and the outside of the battery cell, it also increases the cost of the battery cell structure. Moreover, the current collector obstructs the injection of electrolyte and occupies a certain volume inside the battery cell shell. The connection between the current collector and the positive terminal of the battery cell is achieved through welding pins and terminals, but the cross-sectional area of ​​the welding pins limits the current carrying capacity between the current collector and the terminals. Utility Model Content

[0003] The purpose of this invention is to provide a battery terminal and a battery to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A battery terminal includes a terminal body fixedly connected to one end of a battery cell. An annular groove is provided in the middle of the terminal body, and an insulating washer is sleeved on the annular groove. The terminal body is connected to a housing through the insulating washer, and the outer edge of the insulating washer is sealed and insulated from the inner wall of the housing.

[0006] By directly connecting the terminal body to the battery cell, the structure of the battery terminal part is simplified, and an insulating gasket is used to achieve a sealed and insulated connection between the terminal body and the casing.

[0007] As a further aspect of this utility model, the diameter of the insulating washer is not less than the inner diameter of the housing.

[0008] The sealing effect of the insulating gasket is increased by compression.

[0009] As a further embodiment of this invention, the insulating gasket is made of PE or PP material.

[0010] PE or PP materials can improve insulation and sealing performance.

[0011] As a further embodiment of this utility model: the housing, battery cell, terminal body, and insulating gasket are all circular structures.

[0012] The terminals in this application are mainly used in cylindrical lithium-ion batteries.

[0013] A battery, wherein the battery cell is inserted into a housing, at least one end of the battery cell is fixedly connected to a terminal body, and an electrode tab is provided at the end of the battery cell, and the terminal body is fixedly connected to the electrode tab.

[0014] By directly fixing the terminal body to the electrode tab, the current collector is eliminated, reducing material costs and simplifying the assembly process.

[0015] As a further embodiment of this utility model: the terminal body is welded to the battery cell, and a welding path is provided on the connection end of the terminal body near the electrode tab.

[0016] This application provides a welding path on the connection end of the terminal body, and the terminal body and the electrode are welded together by laser welding at the welding path position.

[0017] As a further embodiment of this utility model: the welding path is a groove provided on the connecting end, and the welding path is formed by stamping.

[0018] By pre-setting the welding path through stamping, and then welding the connection through the welding path, the accuracy of the welding connection is improved.

[0019] As a further embodiment of this utility model: multiple welding paths are provided, and the welding paths are rectangular, triangular or circular structures, and the multiple welding paths are distributed around the center circumference of the terminal body.

[0020] By setting multiple welding paths and placing the periphery of the welding paths around the center of the terminal body, the welding strength between the terminal body and the battery cell can be improved.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. The terminals of this application are directly connected to the battery cells, eliminating the current collector assembly. The terminals and battery cell tabs are directly connected, replacing the current collector adapter, which reduces material costs, simplifies the assembly process, and frees up internal space in the battery casing, which is beneficial for electrolyte wetting and retention.

[0023] 2. The terminals and tabs of this application are welded together, which reduces the assembly process of structural components, shortens the current path inside the cell, and eliminates the welding pins, thus optimizing the current bottleneck problem of the welding pins; the current bottleneck of the terminals and bare cells depends on the welding surface of the terminals and tabs. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the battery terminal location in this embodiment;

[0025] Figure 2 This is a schematic diagram showing the connection status between the terminals and the battery cell in this embodiment;

[0026] Figure 3 This is a schematic diagram of the bottom structure of the terminal in this embodiment;

[0027] Figure 4 This is a schematic diagram of the insulating washer structure in this embodiment;

[0028] In the diagram: 1-shell, 2-cell, 21-tab, 3-terminal body, 31-connection end, 32-ring groove, 33-welding path, 4-insulating gasket. Detailed Implementation

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1

[0031] Please see Figure 1-4 In this embodiment of the present invention, a battery terminal includes a terminal body 3 fixedly connected to one end of a battery cell 2. One end of the terminal body 3 is fixedly connected to the battery cell 2. An annular groove 32 is provided in the middle of the terminal body 3. An insulating washer 4 is sleeved on the annular groove 32. The outer edge of the insulating washer 4 is sealed and insulated from the inner wall of the housing 1. In this embodiment, the diameter of the insulating washer 4 is not less than the inner diameter of the housing 1. The insulating washer 4 is made of PE or PP material.

[0032] A battery terminal includes a housing 1, a battery cell 2 inserted into the housing 1, a tab 21 provided at one end of the battery cell 2, and a terminal body 3 fixedly connected to the tab 21. In this embodiment, the terminal body 3 is welded to the battery cell 2, and a welding path 33 is provided on the connection end 31 of the terminal body 3 near the tab 21. The welding path 33 is a groove provided on the connection end 31 and is formed by stamping.

[0033] In addition, multiple welding paths 33 are provided. The welding paths 33 are rectangular, triangular or circular structures. The multiple welding paths 33 are distributed around the center circumference of the terminal body 3. In this embodiment, the welding path 33 is a triangular structure and there are six welding paths.

[0034] The casing 1, the battery cell 2, the terminal body 3, and the insulating gasket 4 are all circular structures, that is, this embodiment is a cylindrical lithium battery.

[0035] Insulating washer 4 is snapped into the circular cutout at the top of cylindrical housing 1; terminal body 3 is connected to electrode tab of cell 2 via laser welding at welding path 33; such as Figure 1 The terminal body 3 is snapped into the groove around the insulating washer 4, and the terminal body 3 is then snapped into the insulating washer 4 by a sealing mechanism, thus connecting the terminal body 4, the insulating washer 4, and the battery cell housing. The insulating washer 4 isolates the housing 1 from the terminal 3, preventing a short circuit between the housing 1 and the terminal 3.

[0036] Example 2

[0037] In this embodiment, the casing 1, the cell 2, the terminal body 3, and the insulating gasket 4 are all rectangular structures, that is, this embodiment is a rectangular battery.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery terminal, characterized in that, It includes a terminal body (3) fixedly connected to one end of the battery cell (2), an annular groove (32) is provided in the middle of the terminal body (3), an insulating washer (4) is sleeved on the annular groove (32), the terminal body (3) is connected to the housing (1) through the insulating washer (4), and the outer edge of the insulating washer (4) is sealed and insulated from the inner wall of the housing (1).

2. A battery terminal according to claim 1, characterized in that, The diameter of the insulating washer (4) is not less than the inner diameter of the housing (1).

3. A battery terminal according to claim 1, characterized in that, The insulating gasket (4) is made of PE or PP material.

4. A battery terminal according to claim 1, characterized in that, The housing (1), battery cell (2), terminal body (3), and insulating gasket (4) are all circular structures.

5. A battery using the battery terminals described in any one of claims 1-4, characterized in that, The battery cell (2) is inserted into the housing (1). At least one end of the battery cell (2) is fixedly connected to a terminal body (3). The end of the battery cell (2) is provided with a tab (21). The terminal body (3) is fixedly connected to the tab (21).

6. A battery according to claim 5, characterized in that, The terminal body (3) is welded to the battery cell (2), and a welding path (33) is provided on the connection end (31) of the terminal body (3) near the tab (21).

7. A battery according to claim 6, characterized in that, The welding path (33) is a groove provided on the connecting end (31), and the welding path (33) is formed by stamping.

8. A battery according to claim 6, characterized in that, Multiple welding paths (33) are provided. The welding paths (33) are rectangular, triangular or circular structures, and the multiple welding paths (33) are distributed around the center circumference of the terminal body (3).

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