Unveiling the Thermal Conductivity of Copper Foil: The thermal conductivity of pure rolled copper foil is approximately 398 W/(m·K), which is twice that of ordinary aluminum alloy. Like a fast lane on a highway, the free electrons inside the copper foil can quickly transfer heat. However, in practical applications, a 0.1mm thick copper foil will have approximately 15% lower longitudinal heat transfer efficiency compared to a 5mm thick copper plate.
Three Major Variables Affecting Thermal Conductivity
Purity: Copper foil with 99.9% copper content has 8% higher thermal conductivity than 99% copper foil.
Processing Technology: Rolled copper foil has more stable thermal conductivity and 20% better temperature resistance than electrolytic copper foil.
Surface Treatment: Nickel plating reduces thermal conductivity by 30%, while anti-oxidation coatings only affect it by 5%.
Ingenious Applications in Heat Dissipation
From mobile phone motherboards to power batteries, ultra-thin copper foil is rewriting the rules of heat dissipation:
Foldable screen phones: 0.05mm copper foil acts as a "heat deliveryman," transferring chip heat within 10 seconds.
Electric vehicles: Copper foil-graphene composite heat dissipation layers keep battery pack temperature differences within 3°C.
Aerospace equipment: Multi-layer copper foil vacuum encapsulation enables directional heat conduction in zero-gravity environments.
