Production method of conductor material for connection between great current cell

Abstract

The invention provides a preparation method of a conductor material used for connection between high-current batteries, which is characterized in that: a copper piece is taken as base material, metallic nickel is plated on the copper piece and then heat treatment is carried out to the nickel-plated copper piece in vacuum environment. Compared with the existing conductor materials, the conductor material prepared and provided by the invention has the advantages as follows: 1. lower resistivity, thus being favorable for the exertion of the performance of the batteries; as the base material of the conductor material is copper, the resistivity of which is much lower than that of nickel and ferrous, and the resistivity of a conductor can be effectively reduced by adopting the material; and 2. compared with the method which directly uses the copper as the conductor material, the material has better welding performance, as the copper is taken as the base material and the surface of the copper piece is plated with a layer of nickel, thus effectively improving the welding performance between a copper conductor and the external shells of the batteries.

Description

technical field [0001] The invention relates to the field of electrical conductors, in particular to a method for making a conductor material used for connecting high-current batteries. Background technique [0002] With the increasing popularity of portable high-performance electric tools and smart toys, and due to the increasing requirements on weight and continuous working time of portable tools, lithium-ion batteries with high energy density and high operating voltage have stronger competitiveness. Due to the limitation of the low conductivity of the non-aqueous electrolyte, its high-rate charge and discharge performance is not good. Most of them can only continuously work and discharge at a current of less than 3C, and discharge at a current of less than 10C instantaneously, which cannot meet the needs of applications such as power tools. 7C to 7C 10C continuous working discharge, 20C instantaneous high current discharge requirements. It was not until the industrializa...

AI Technical Summary

Problems solved by technology

At present, when the batteries are connected in series and parallel, the positive and negative electrode materials welded outside the battery are mainly nickel and iron, but the resistivity of nickel and iron is relatively high, so they are not good conductors. Although copper is an excellent conductor, its price is relatively high, and Since the battery casing is generally made of aluminum or iron, but the welding performance between aluminum and copper is not strong, so the application of copper conductors is limited