In the automotive industry, as carbon dioxide emission regulations become stricter, the demand for lightweight wiring harnesses is also increasing, and the demand for weight reduction is also increasing. In addition, due to the soaring price of copper, replacing traditional copper wires with aluminum wires can be expected to effectively reduce weight. However, aluminum wire has disadvantages such as low conductivity, low tensile strength, poor processability, strong surface insulation oxide film, and galvanic corrosion. This is a disadvantage that we cannot ignore. The technology of aluminum wire is becoming increasingly mature, and the application of aluminum wire is increasing.

Aluminum wire is mainly used for overhead power lines and automotive battery cables, with a large cross-sectional area of conductors to support high currents. However, the cross-sectional area of the conductor in the wiring harness usually does not exceed 2.5 square millimeters. For this reason, many companies have developed aluminum wire bundles with small wire diameters in this type of automotive application, which has a great potential to replace copper conductors.