Abstract:

In order to solve problem about heat dissipation during the process of the Li-ion batterys in electric vehicle, we made simulation and optimized the thermal management of battery pack. Firstly, research was done on the heat generating mechanism and the heat transfer mechanism of Li-ion cell and a three-dimensional thermal model for battery was established. Secondly, the temperature distribution and temperature curve of the cell are simulated. Then the surface temperature during the working process was compared the thermal model was modified. Finally, the modified model was applied to a battery pack to simulate the temperature distribution, then forced cooling equipment on battery pack was added to reduce the temperature of the cells in the pack and the pack structure was optimized. According to the simulation results we found when the ambient temperature is 20℃and the cooling air inlet area is 6 times the area of a single cell profile area and the mass flow of cooling air is 1 kg·s1, the cooling effect is better and more economical.

Key words: the thermal model, single battery simulation, battery pack simulation