Heat dissipation technology mainly refers to the way, method and technology of external thermal design, which involves heat dissipation or cooling methods, materials and other aspects related to heat transfer. At present, almost all Almost all radiators dissipate heat mainly by means of heat conduction and heat convection. According to the different methods of heat conduction and convection, radiator products can be divided into two types: active and passive. The active meaning is that there are energy sources unrelated to the heating element involved in forced heat dissipation, such as fans, water pumps in liquid cooling, and compressors in phase change refrigeration. The common characteristic of these heat dissipation methods is high efficiency, but they also require the assistance of other energy sources. On the contrary, passive cooling relies solely on the self divergence of the heating element or heat sink for cooling. At present, the widely used heat dissipation technologies mainly include natural heat dissipation or cooling methods, forced heat dissipation or cooling methods, liquid cooling technology, active refrigeration and heat dissipation methods, etc.