Simulation of Parallel Layered Air Cooling Thermal Management System for Li-ion Batteries

Battery thermal management structure design is an important measure to ensure high reliability and long life of battery. This paper combines the advantages of parallel ventilation and layered air channels and proposes a new parallel layered air cooled structure to improve the heat dissipation effect of the battery pack. The structure uses thermal conductive partitions to divide the air channel into upper and lower parts, and adopts a design where two independent fan channels work simultaneously. The upper and lower channels adopt reverse Z Type ventilation. Firstly, the anisotropic heat transfer model of Li-ion battery is established based on the heat generation theory. Then, combined with the heat transfer model, the influence of different flow directions on the heat dissipation performance is studied by using FLUENT simulation software. Finally, the thermal management structure proposed in this paper is improved and optimized. The results show that the maximum temperature and the maximum temperature difference of the battery pack decrease after using the parallel layered air cooling structure, and the temperature field distribution of the battery pack is obviously improved; after increasing the number of outlets, the maximum temperature of the battery pack decreases by 9.55%, the maximum temperature difference decreases by 16.56%, and the heat dissipation performance is further improved.