Conductive connection structure for a lithium battery

Abstract

This utility model relates to a conductive connection structure for a capacitive lithium battery, including a positive electrode pin, a positive electrode tab, a negative electrode pin, and a negative electrode tab. Compared with the prior art, the conductive connection structure of this utility model's capacitive lithium battery uses a riveting method to achieve electrical connection. The lower end of the positive electrode pin is riveted to the positive electrode tab, and the lower end of the negative electrode pin is riveted to the negative electrode tab. Both the positive and negative electrode tabs are sheet-like, and both have multiple riveting points. The positive electrode tab is riveted to the positive electrode sheet of the lithium battery cell through the riveting points, and the negative electrode tab is riveted to the negative electrode sheet of the lithium battery cell through the riveting points. The riveting method is stable and will not cause problems such as welding different partitions that affect conductivity. Therefore, the capacitive lithium battery can achieve a high-speed discharge rate of over 50C, and the riveting process is fast and meets the needs of automated production.

Description

Technical Field

[0001] This utility model relates to the field of lithium batteries, specifically to a conductive connection structure for a capacitive lithium battery. Background Technology

[0002] In current lithium-ion battery production, welding is required for various connections, including between tabs and electrode sheets, cover plates and tabs, tabs and lead terminals, and lead terminals and wires. Conventional thermomelting welding methods, such as resistance spot welding, ultrasonic spot welding, and laser welding, work by melting the workpieces through energy input, followed by cooling and crystallization to form a seamless weld joint. Due to varying heating temperatures, thermomelting welding can be categorized into weld zones, fusion zones, and heat-affected zones, each affecting conductivity differently. Laser welding converts absorbed laser energy into heat, causing the metal surface to heat up and melt. Ultrasonic welding generates heat through vibration and friction, melting the contact surface. Resistance welding uses electrical resistance to generate heat, melting the workpieces to form a molten nucleus, which then cools and crystallizes to form a weld joint. In other words, during resistance welding, the contact resistance and internal resistance of the workpieces are essential for generating heat. In lithium-ion battery products, the resistance of the weld joint is a major cause of battery self-discharge. In summary, the existing conductive connection structure of lithium-ion capacitors, which uses welding, has the disadvantage of creating different partitions that affect conductivity, thus hindering the achievement of high-rate discharge. Utility Model Content

[0003] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is how to optimize the conductive connection structure of a capacitive lithium battery. The specific technical solution is as follows:

[0004] A conductive connection structure for a capacitive lithium battery includes a positive electrode pin, a positive electrode tab, a negative electrode pin, and a negative electrode tab. The lower end of the positive electrode pin is riveted to the positive electrode tab, and the lower end of the negative electrode pin is riveted to the negative electrode tab. Both the positive and negative electrode tabs are sheet-shaped and have multiple riveting points. The positive electrode tab is riveted to the positive electrode sheet of the lithium battery cell through the riveting points, and the negative electrode tab is riveted to the negative electrode sheet of the lithium battery cell through the riveting points. The positive and negative electrode pins extend from the top of the lithium battery cell in the same direction.

[0005] In a preferred embodiment of this utility model, the riveting points are distributed at equal intervals along the length of the sheet.

[0006] As a preferred embodiment of this utility model, the cross-sectional shape of the riveting point is plum blossom-shaped.

[0007] As a preferred embodiment of this utility model, the cross-sectional shape of the riveting point is a pentagonal star.

[0008] Beneficial effects: Compared with the prior art, the conductive connection structure of the capacitive lithium battery of this utility model adopts a riveting method to achieve electrical connection. The lower end of the positive electrode guide pin is riveted to the positive electrode tab, and the lower end of the negative electrode guide pin is riveted to the negative electrode tab. Both the positive and negative electrode tabs are sheet-shaped and have multiple riveting points. The positive electrode tab is riveted to the positive electrode sheet of the lithium battery cell through the riveting points, and the negative electrode tab is riveted to the negative electrode sheet of the lithium battery cell through the riveting points. The riveting method is stable and will not cause problems such as welding different partitions that affect conductivity. Therefore, the capacitive lithium battery can achieve a high-speed discharge rate of over 50C, and the riveting process is fast and meets the needs of automated production. Attached Figure Description

[0009] Figure 1 This is a structural diagram of the present invention;

[0010] Figure 2 This is a riveting embodiment of the positive electrode guide pin and positive electrode tab of this utility model;

[0011] Figure 3 This is an embodiment of the negative electrode guide needle and negative electrode tab of this utility model. Detailed Implementation

[0012] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0013] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0015] like Figure 1As shown, a conductive connection structure for a capacitive lithium battery includes a positive electrode pin 1, a positive electrode tab 2, a negative electrode pin 3, and a negative electrode tab 4. The lower end of the positive electrode pin 1 is riveted to the positive electrode tab 2, and the lower end of the negative electrode pin 3 is riveted to the negative electrode tab 4. Both the positive electrode tab 2 and the negative electrode tab 4 are sheet-shaped, and both the positive electrode tab 2 and the negative electrode tab 4 are provided with multiple riveting points 5. The riveting points 5 are evenly distributed along the length of the sheet, and having multiple riveting points 5 is beneficial for more stable riveting. The positive electrode tab 2 is riveted to the positive electrode sheet 6 of the lithium battery cell 8 through the riveting points 5, and the negative electrode tab 4 is riveted to the negative electrode sheet 7 of the lithium battery cell through the riveting points 5. The positive electrode pin 1 and the negative electrode pin 3 extend from the top of the lithium battery cell 8 in the same direction. The lithium battery cell 8 is formed by winding the positive electrode sheet 6, the negative electrode sheet 7, and the separator 9. The separator 9 separates the positive electrode sheet 6 and the negative electrode sheet 7.

[0016] like Figure 2 As shown, the positive electrode tab 2 is riveted to the positive electrode sheet 6 of the lithium battery cell 8 through the riveting point 5. The cross-sectional shape of the riveting point is plum blossom-shaped. The negative electrode tab 4 has the same structure.

[0017] like Figure 3 As shown, the negative electrode tab 4 is riveted to the negative electrode sheet 7 of the lithium battery cell through the riveting point 5. The cross-sectional shape of the riveting point is a pentagonal star. The positive electrode tab 2 has the same structure.

[0018] In summary, the conductive connection structure of the capacitive lithium battery of this utility model achieves electrical connection by using a riveting method to connect the positive and negative guide pins to the positive and negative tabs, and the positive and negative tabs to the positive and negative electrode plates. The riveting method is stable and will not cause problems such as welding different sections that affect conductivity. Moreover, the riveting is highly automated and efficient.

[0019] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the protection scope of the present utility model.

Claims

1. A conductive connection structure for a capacitive lithium battery, characterized in that: It includes a positive electrode pin, a positive electrode tab, a negative electrode pin, and a negative electrode tab. The lower end of the positive electrode pin is riveted to the positive electrode tab, and the lower end of the negative electrode pin is riveted to the negative electrode tab. Both the positive and negative electrode tabs are sheet-shaped and have multiple riveting points. The positive electrode tab is riveted to the positive electrode sheet of the lithium battery cell through the riveting points, and the negative electrode tab is riveted to the negative electrode sheet of the lithium battery cell through the riveting points. The positive and negative electrode pins extend from the top of the lithium battery cell in the same direction.

2. The conductive connection structure of a capacitor-type lithium battery according to claim 1, characterized in that: The rivet points are evenly distributed along the length of the sheet.

3. The conductive connection structure of a capacitive lithium battery according to claim 1 or 2, characterized in that: The cross-sectional shape of the rivet point is plum blossom-shaped.

4. The conductive connection structure of a capacitive lithium battery according to claim 1 or 2, characterized in that: The cross-sectional shape of the rivet point is a pentagonal star.

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