Preparation method of copper-aluminum composite plate strip with composite side edges

Abstract

The invention relates to a preparation method of a side edge compounded copper-aluminum composite plate strip, and belongs to the technical field of new energy batteries, the preparation method comprises the following steps: forming a corrugated groove in the side edge of a copper plate strip, not forming a notch in an aluminum plate strip, cleaning and polishing the surfaces of the copper plate strip and the aluminum plate strip, performing laser heating on one side of the aluminum plate strip to a molten crystal state, and then performing heat treatment on the aluminum plate strip; laterally extruding with a copper plate strip with a corrugated groove to carry out metallurgical embedding; and after the temperature is regulated and controlled, multi-pass rolling is carried out, and then high-temperature heat treatment is carried out to obtain the copper-aluminum composite plate strip. The preparation method is simple in technological process, easy to implement and suitable for both thin and thick plate strips, the prepared copper-aluminum plate strip is good in interface bonding quality and excellent in performance, and the preparation method has remarkable application value.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a preparation method of a copper-aluminum composite plate and strip with side composites. Background technique [0002] The copper-aluminum composite material prepared by using copper-aluminum sheets or strips through special composite connections can be used to make tabs for electrode terminals of new energy electric vehicle battery packs, and has broad application prospects. [0003] There are many preparation methods for the copper-aluminum composite material, such as welding method and riveting method, but the welding method needs to weld copper and aluminum into copper-aluminum connection components one by one, which requires a lot of labor and equipment, low efficiency and high cost. In addition, it is easy to produce poor welding, poor product stability and consistency, and welding is prone to welding stress, high brittleness, and insufficient toughness in the...

AI Technical Summary

Problems solved by technology

[0005] The mortise and tenon side joint method is more suitable for thick plates, but for the continuous production of thin plates and strips, especially strips below 1mm, the lateral tenon and mortise grooves are not easy to process, and it is time-consuming and labor-intensive. The deformation is large and it is difficult to realize the lateral mortise of copper and aluminum, which in turn affects the rolling fusion of the subsequent extrusion process; at the same time, in the continuous production process, the cleaning treatment of this mortise and tenon forming surface is very easy to produce dead angles and introduce inclusions, thus affecting Connection quality; In addition, this mortise and tenon joint method is to apply an extrusion force on the front of the plate after the mortise and tenon joint. Even if a certain lateral extrusion force is applied before rolling, it is difficult to avoid the copper-aluminum strip Lateral separation tendency due to widening during longitudinal rolling, which has a negative impact on the tensile strength and electrical resistivity of the finished product

[0006] Using the method of intersecting and superimposing the side parts of multi-layer copper-aluminum strips and then rolling, the deformation of the non-superimposed part of copper and aluminum and the superimposed part in the subsequent rolling process is quite different, which will cause serious residual stress and serious Affects the performance after compounding. Even if the annealing heat treatment is carried out later, it is difficult to ensure that the tensile strength of the copper-aluminum bonding layer must be higher than that of the aluminum layer, especially not suitable for the production of thicker plates.

Secondly, the superposition of multi-layer strips requires the fusion of copper-copper, aluminum-aluminum, and copper-aluminum multilayer interfaces. It needs to undergo multiple large-area surface treatments such as acid and alkali. The process is cumbersome, which is not only environmentally friendly. It is very high, and the resistivity of the product will also increase due to the combination of void defects or excessive impurities.

Images