Study on heat dissipation system of phase change heat storage liquid-cooled lithium- ion battery pack

The Lithium battery thermal management system has always been one of the important factors restricting the development of electric vehicles. With the continuous improvement of the performance of electric vehicles, the traditional heat dissipation methods can not meet the needs of today. Therefore, it is necessary to propose new and effective heat dissipation methods to promote the development of the electric vehicle industry. Based on phase change materials and liquid cooling, the thermal management of lithium batteries is simulated and analyzed in this paper. Paraffin is selected as the phase change material, the geometric model is established, and the heat transfer simulation is carried out by using COMSOL software. The effects of condensate flow rate and copper tube arrangement on the heat dissipation of the battery pack are studied, and the influence degree and mode of each factor affecting the heat dissipation of the battery are obtained according to the simulation results. The results show that the spiral arrangement of copper tubes is better than the U-shaped arrangement; When the number of turns of the copper tube is 4, the lithium-ion battery pack has better heat dissipation efficiency; The flow rate of 1.5m/s is more conducive to the heat exchange between coolant and paraffin material.