Why are tinned copper wires, aluminum wires, and aluminum busbars the future development trend for new energy vehicle wiring harness materials?

Public data shows that China's annual production and sales of new energy vehicles have surged from 75,000 units ten years ago to 9.5 million units today, accounting for over 60% of the global total, with a compound annual growth rate of 71%. Currently, China's new energy vehicle industry is entering an accelerated development phase, and achievements in areas such as new energy vehicles and power batteries are rapidly gaining widespread adoption. Consumers' preference for new energy vehicles stems not only from environmental awareness and the pursuit of low-carbon mobility but also from the desire for more efficient energy conversion. Compared to traditional internal combustion engine vehicles, new energy vehicles offer advantages in environmental protection and intelligence, but their greatest strength lies in energy conversion efficiency.

The energy conversion efficiency of internal combustion engines in conventional fuel vehicles typically ranges between 20% and 30%, with the remainder lost as waste heat. In contrast, new energy vehicles achieve energy conversion efficiencies of 80% to 90%, whether purely electric or plug-in hybrid, significantly outperforming fuel-powered vehicles. As more efficient power units gradually replace less efficient ones in new energy vehicles, overall energy efficiency will continue to improve. The rise of new energy vehicles represents not only a green transformation in transportation but also a clear direction toward future high-efficiency energy utilization.

According to research by scholars both domestically and internationally, the energy conversion efficiency of new energy vehicles is significantly influenced by factors such as battery performance, motor efficiency, vehicle weight, and energy losses during charging and discharging processes. These losses directly limit further improvements in energy conversion efficiency.

From current technological trends, optimizing the materials and connection methods of electrical wiring systems in new energy vehicles appears to be the most effective way to enhance energy conversion efficiency.

Traditionally, automotive wires have used copper as the conductor material. However, copper wires have certain drawbacks—such as being prone to oxidation, which leads to the formation of verdigris. This not only degrades the wire’s appearance but, more importantly, compromises its conductivity, significantly increasing circuit resistance and reducing current transmission efficiency, potentially affecting the performance and safety of new energy vehicles.

To address the issue of copper wire oxidation, tin-plated copper wire is commonly used. The tin coating effectively prevents copper from coming into contact with oxygen and moisture in the air, thereby slowing down the oxidation process. Additionally, tin-plated copper wire offers excellent electrical conductivity and mechanical properties, making it highly valuable for applications in new energy vehicles.