Heat Dissipation Performance Analysis of a Hybrid Battery Thermal Management System

In order to analyze the heat dissipation performance of a hybrid battery thermal management system combining active and passive cooling, firstly, a numerical simulation model of the system was established, which was coupled by the heat generation model of the single battery and the heat transfer model of composite phase change material(CPCM). Then, the thermal generation model of the battery was verified by experiments. Secondly, the central composite design method was used to establish the experimental design table based on the system parameters, and the battery temperature field under all experimental conditions in the design table was calculated by ANSYS Fluent. Then, the Kriging response surface type was selected to fit the relationship between the output variables and the input variables. Finally, the sensitivity analysis of the heat dissipation parameters of the system was conducted. The results show that the thickness of CPCM has no obvious effect on the temperature control and temperature uniformity of the battery, but the convective heat transfer coefficient has a great influence on the heat dissipation performance. In addition, the thermal conductivity of CPCM increases with the increase of the CPCM density and the graphite mass fraction, while the CPCM latent heat increases with the increase of the CPCM density and the decrease of the graphite mass fraction.