Copper-aluminum composite material and preparation method thereof

Abstract

The invention provides a copper-aluminum composite material and a preparation method thereof. The copper-aluminum composite material comprises a Cu metal plate and an Al metal plate which are compounded into a whole through cold rolling. Before cold rolling compounding, Cu nano sol particles are evenly sprayed to the surfaces of the metal plates, rich active sites are formed through in-situ etching, a three-dimensional rough structure is constructed on the Cu and / or Al metal surface, and the copper-aluminum composite material is formed. The method comprises the steps that the Cu nano sol particles are synthesized through a sol-gel method; the Cu nano sol particles are evenly sprayed to the surfaces of the Cu and / or Al metal plates, rich active sites are formed through in-situ etching, thethree-dimensional rough structure is constructed on the Cu and / or Al metal surface, and the Cu and / or Al metal plates with the surfaces subjected to in-situ activation etching are obtained; and then the Cu and Al metal plates with the surfaces subjected to in-situ activation etching are subjected to cold rolling compounding solid state connection, and the copper-aluminum composite material is obtained. The copper-aluminum composite material and the preparation method thereof are simple in process, high in production efficiency and low in manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a Cu nano sol particle etching-assisted solid-state connection copper-aluminum composite material and a preparation method thereof. Background technique [0002] The battery pack system of a new energy vehicle is the main core component of the vehicle, and its performance is directly related to the comprehensive performance of the vehicle's electrical connection data / signal transmission; copper-aluminum (Cu / Al) composite materials have The advantages of high electrical and thermal conductivity of aluminum, light weight and low price of aluminum have made great progress in the field of power vehicles as battery electrode connectors. In terms of manufacturing process, domestic power vehicle battery electrode connectors mainly use conventional connection technologies such as friction welding, brazing, and casting molding to prepare copper-aluminum (Cu / Al) composite connectors ...

AI Technical Summary

Problems solved by technology

However, the above connection technologies have certain defects in the preparation process, connection performance and manufacturing cost of copper-aluminum (Cu / Al) composite connectors. For example, copper-aluminum composite connectors produced by friction welding (FW) technology are mainly limited by The special processing conditions of friction welding and the cylindricity of copper-aluminum composite columns that cannot be precisely controlled lead to difficulties in subsequent assembly and processing, increased manufacturing costs, and cannot meet the development needs of future industrialization.

Copper-aluminum composite connectors prepared by brazing technology are prone to defects such as virtual welding and overflow soldering due to the introduction of the third component solder, resulting in increased internal resistance and poor stability of the connector, resulting in local areas of the connector Excessive temperature rise can cause safety accidents; and in the composite process of copper-aluminum composite connectors prepared by casting forming (Casting Forming), a higher casting temperature (>650°C) is conducive to the formation of a good interface between the two phases of copper and aluminum Bonding strength, but it is easy to form copper-aluminum intermediate compounds Cu / Al, Cu at the interface during the subsequent heat treatment process regulation 4 Al 3 and Au 3 Al 2 Such hard and brittle phases severely weaken the bonding strength of copper-aluminum composite connectors; in addition, the pouring temperature higher than the melting point of aluminum, an oxygen-free environment, and special surface treatment methods lead to large energy consumption for the preparation of connectors. The process conditions are harsh, and on the other hand, it is easy to have defects such as straightness deviation and high interface internal resistance between the copper pole and the connecting plate

[0003] Therefore, traditional copper-aluminum (Cu / Al) composite materials have performance defects such as weak interfacial bonding strength, high interfacial internal resistance, and poor mechanical properties. At present, the market needs to propose a composite material that can overcome the above defects

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