Battery lead wire and manufacturing method

Abstract

The invention relates to a battery lead-out line which is formed by overlapping the three materials of steel, nickel and copper in a strap-shape and then cold rolling. The manufacturing process for the battery lead-out line comprises the following steps: firstly, the three materials of the steel, the nickel and the copper are cold-rolled into strap-shapes according to the required thickness; secondly, surface treatment is respectively performed to all the strap-shaped materials; thirdly, the three strap-shaped materials are overlapped together in sequence, and then cold-rolled and pressed to reach the thickness required by the lead-out line; fourthly, annealing treatment is carried out; and fifthly, the lead-out line is cut into the required width. The invention fully utilizes the characteristics of all the materials, the differences between the materials of the battery lead-out line and the pure nickel strip material are not significant in the electrical conductivity, the thermal conductivity, the resistance and the welding performance among the lead-out line, the tab and the cover plate thereof, the materials of the battery lead-out line are superior to the copper strip or copper nickel composite material, and can replace the original pure nickel material, therefore, the production cost is reduced, and the problem of the scarcity of the nickel material is also solved. The manufacturing process is not required to change the original physical characteristics of the three materials, and the three materials are closely combined, thereby the service performance of the products is effectively ensured.

Description

【Technical field】 [0001] The invention relates to a material processing, in particular to a battery lead-out wire with a composite structure and a method for manufacturing the lead-out wire. 【Background technique】 [0002] In the field of battery processing, the negative electrode in the lithium-ion secondary battery generally needs to be connected with the battery case or the negative terminal with the corresponding lead wire. When the lead wire is connected with the electrode and the cover plate, in order to reduce the contact resistance, point Welding or riveting, etc. [0003] At present, the main material of lead-out wires on the market is pure nickel strips. However, in recent years, due to various influences, the supply of metal nickel has been in short supply, and nickel materials are scarce, which has caused the price of pure nickel on the market to rise sharply. And its nickel content of the pure nickel belt that lithium battery uses is higher (more than 99.5%), t...

AI Technical Summary

Problems solved by technology

[0003] At present, the main material of lead-out wires on the market is pure nickel strips. However, due to various influences in recent years, the supply of metal nickel has been in short supply, and nickel materials are scarce, which has caused the price of pure nickel on the market to rise sharply.

However, the nickel content of the pure nickel strip used in the lithium battery is relatively high (above 99.5%), and the price of the pure nickel strip has risen significantly due to the influence of the market, thereby increasing the cost of the lithium battery and reducing the economic benefits of the enterprise.

[0004] Some manufacturers hope to use copper instead as the negative lead wire, but because of its good heat dissipation and electrical conductivity, it is difficult to weld it firmly with the shell and the electrode

In addition, a copper-nickel composite material has also been developed for this direction, but because it is only composed of nickel and copper, its electrical conductivity will still be much higher than that of ordinary nickel strips, and there are also similar copper strips. Poor solderability and cost issues

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