At present, the thermal management of power battery systems can be mainly divided into four categories: natural cooling, air cooling, liquid cooling, and direct cooling.
Among them, natural cooling is a passive thermal management method, while air cooling, liquid cooling, and direct cooling are active methods. The main difference between the three lies in the difference in heat exchange media.
Traditional battery cooling system: To change the temperature difference between the battery core and the cooling system, liquid cooling system refrigeration is the most useful method.
How is ceramic heat dissipation applied to battery heat dissipation?
Replace low thermal conductivity insulating plastic materials with high thermal conductivity ceramic materials.
Aluminum nitride ceramic sheets
Studies have shown that rapid heat dissipation and temperature balance can be achieved by utilizing the high thermal conductivity and high insulation of ceramics. Aluminum nitride ceramic plates are currently used more frequently.
Advantages of aluminum nitride ceramic sheets
Aluminum nitride ceramic substrates have the characteristics of high thermal conductivity, low expansion coefficient, high strength, high-temperature resistance, chemical corrosion resistance, high resistivity, and low dielectric loss. It is an ideal large-scale integrated circuit heat dissipation substrate and packaging material.
1. High thermal conductivity
Aluminum nitride ceramics have very high thermal conductivity, with a theoretical value of up to 320W/m·K, which is much higher than traditional alumina ceramics. This makes aluminum nitride ceramics an ideal heat dissipation material for electronic equipment, LED lighting, laser equipment, and other fields, effectively improving the efficiency and life of the equipment.
2. Excellent electrical insulation
Aluminum nitride ceramic substrates have good electrical insulation, low dielectric constant, low dielectric loss, and remain stable at high frequencies. These characteristics make it the preferred material for high-frequency, high-power electronic devices, such as high-frequency circuit substrates, power module packaging, etc.
3. Good thermal expansion matching
The thermal expansion coefficient of aluminum nitride ceramic substrates is about 4.5×10^-6/K, which is very close to semiconductor materials such as silicon (Si) and gallium arsenide (GaAs). This makes aluminum nitride ceramics an ideal substrate material for semiconductor devices, helping to reduce thermal stress and improve the reliability and stability of devices.
Based on the advantages of good thermal conductivity, heat resistance, good insulation, and low thermal expansion coefficient of ceramic substrates, in addition to battery systems, ceramic substrates are also widely used in power electronic device packaging. At present, ceramic substrates are mainly used in IGBT, LD device packaging, LED packaging, chip packaging modules, etc.
Edgetech specializes in the manufacture and sale of advanced ceramic parts. We provide customized production and high-precision processing for a variety of high-performance ceramic materials, including alumina ceramics, zirconium oxide ceramics, silicon nitride, silicon carbide, boron nitride, aluminum nitride, etc. Our ceramic parts can be found in many industries, such as machinery, chemistry, medicine, semiconductors, vehicles, electronics, metallurgy, etc.