Characteristics and advantages of metal battery box
Oct 17, 2025
The characteristics of metal battery boxes are as follows:
⚙️ Structural strength and corrosion resistance
Metal battery boxes (such as aluminum alloy, stainless steel) have high strength and impact resistance, and can withstand external pressure or collisions.
The chromium oxide passivation film on the surface of stainless steel can isolate moisture and oxygen, effectively prevent rust and electrochemical corrosion, and is suitable for environments with high humidity or temperature differences.
🌡️ heat dissipation performance
Metals (such as aluminum alloys) have excellent thermal conductivity and can quickly disperse the working heat of batteries, reducing the risk of overheating.
It is necessary to cooperate with heat dissipation design (such as opening holes and adding heat sinks) to improve efficiency.
⚖️ Weight and Cost
The weight of the metal casing (such as cast aluminum) is relatively large, accounting for about 10% -20% of the total mass of the battery pack.
Lightweight is often achieved through frame structures or combined with composite materials such as SMC+high-strength aluminum.
🚗 Typical application cases
Volkswagen: Adopting an aluminum alloy frame type box, balancing strength and lightweight.
BYD: Some models use steel casings and composite material covers to optimize costs.
Most entry-level electric vehicles in China use steel casings, while high-end models are gradually transitioning to aluminum alloys.
