In QC/T29106 "Technical Conditions for Automotive Wire Bundles", it is stipulated that the terminals and wires should be firmly crimped and should not be damaged or disconnected under the specified tension. The low tensile strength of aluminum wires affects the terminal crimping and pull-out force. The most effective solution to suppress the decrease in conductivity of aluminum wires while also improving their strength is to develop new aluminum alloy wires. Sumitomo Electric Co., Ltd. has developed aluminum alloy wires with A1 Fe Mg as the main element, which have a tensile strength of over 11OMPa, a fracture elongation of over 15%, and a conductivity of over 58% IACS.

This new aluminum alloy wire not only achieves lightweight wiring harness and ensures conductivity, but also gives the wire excellent strength, processability, and impact resistance. Henan Tianhai Electric Appliance Co., Ltd. has developed an automotive aluminum alloy battery wire containing Al, Fe, Cu, and Mg elements. Copper can increase the resistance stability of the alloy; Iron element enhances the creep resistance of alloys, avoiding relaxation problems caused by creep; Magnesium element can increase the contact point and have higher tensile strength under the same interface pressure.