Experimental research on battery thermal management system based on vapor chamber technology

Abstract

Temperature is a key factor affecting the performance of lithium-ion batteries. In this study, a vapor chamber is used as the heat transfer component for battery thermal management. The heat transfer performance and uniformity of vapor chamber under different power of batteries are studied experimentally. The total thermal resistance, diffusion thermal resistance and effective thermal conductivity of vapor chamber are calculated theoretically. The results show that the diffusion thermal resistance is 0.044°C W−1 and the effective thermal conductivity is 650 W K−1 under heat generation rate of 25 W. The effective thermal conductivity increases significantly with the thermal power of the battery. Under the condition of multiple heat sources, the maximum temperature difference on the surface of the vapor chamber is less than 4°C, which indicates that the vapor chamber has good temperature uniformity, and has a good application prospect for the battery thermal management system.