Study on the Immersion Oil Cooling Method of Power Module

The water cooling method for traditional power modules will increase the volume of the cooling system additionally. And the thermal resistance of the internal ceramic conductive substrate becomes a bottleneck to further improve the cooling capability of the module. In this paper, the heat dissipation method using immersion oil cooling (IOC) is proposed, which directly flows the insulating oil through the cavity of the power module, and directly dissipates heat from the power dies and the ceramic conductive substrate, thereby reducing the additional heat conduction path. To further optimize the heat dissipation capacity of IOC, this paper mainly studies the open hole specifications of the oil inlet and outlet, internal integrated heat sink, and advanced packaging. The results show that IOC can well assume the function of insulation and heat exchange with the outside.