A manufacturing process of copper-aluminum composite pole

Abstract

The invention belongs to the technical field of power battery manufacturing technology, and in particular relates to a manufacturing technology of a copper-aluminum composite pole of a power battery, which includes the following steps: step 1), heating: putting an aluminum block into a heating furnace for heating and melting it into molten aluminum Step 2), liquid injection: inject the aluminum liquid in step 1) into the mold cavity containing the copper block at the bottom and keep it warm; Step 3), cooling: gradually reduce the temperature from high to carry out cooling treatment to form a copper-aluminum composite block; Step 4) Forming: After the mold is released, the size is cut to obtain the copper-aluminum composite pole. Compared with the copper-aluminum composite pole produced by the traditional friction welding process, the copper-aluminum composite pole produced by the manufacturing process of the present invention has higher pull-out strength, lower contact resistance, and the copper-aluminum composite pole is consistent Higher, the manufacturing risk is more controllable, and there will be no abnormalities such as false welding; in addition, the manufacturing process method of the present invention is simple, easy to operate, and the manufacturing cost is low, which is suitable for large-scale production of enterprises.

Description

technical field [0001] The invention belongs to the technical field of power battery manufacturing technology, and in particular relates to a manufacturing technology of a copper-aluminum composite pole of a power battery. Background technique [0002] In the field of power battery technology, the pole is a necessary part of the power battery to connect the inside and outside of the battery. One end of the pole is connected to the external circuit of the power battery, and the other end is connected to the internal cell of the power battery, so that the battery can realize the function of charging and discharging. . Since the external circuit of the battery uses aluminum material to reduce cost and weight, the connection between the single cells in the external circuit generally uses aluminum sheets, but the negative electrode current collector inside the battery cell is made of copper foil material, so the negative electrode column is required to be made of copper material ...

AI Technical Summary

Problems solved by technology

[0003] However, in actual production, it is found that the production process of copper-aluminum composite poles produced by friction welding welding process has the following shortcomings: First, the linear expansion coefficients of copper and aluminum are different, which is easy to cause thermal stress, and this thermal stress is often not easy to eliminate , resulting in large welding distortion

Second, during the welding process, due to the increase of welding stress and brittleness, cracks are prone to occur at the welding interface, especially in the heat-affected zone, which is more prone to cracks and even breaks, which greatly reduces the safety of the composite pole

Second, after welding, the copper-aluminum composite interface resistance is relatively large, and the drawing strength is relatively low, which greatly reduces the reliability of the composite pole connection

Fourth, the friction welding process requires high requirements, and it is also necessary to ensure the cylindricity of the formed pole, which also leads to relatively high manufacturing costs for the composite pole.