关键词: 电动汽车；风冷；锂离子电池；散热结构；流体动力学

Abstract: Thermal management of the battery pack in electric vehicles is very important, and the heat can be dissipated in time to maintain the stability of the battery pack temperature, which can solve the problem of spontaneous combustion explosion of electric vehicles to a large extent. In this paper, a battery air-cooled heat dissipation structure is designed, and a heat dissipation structure with better heat dissipation is obtained by performing a series of optimized designs for serial and parallel air channels. Through the modeling and simulation analysis of ANSYS Fluent software, the structure optimization is carried out by attaching the heat dissipation hole, improving the position of the air inlet and the inclination angle, and the results show that the heat dissipation and structure are optimal when the inclination angle of the air inlet is 8°, and the heat generation is that the maximum temperature difference of the battery pack is 3.9 ℃, the maximum temperature is 33.7 ℃, and the minimum temperature is 29.8 ℃ under the 1 C charging rate.

Key words: Electric vehicles; Air cooling; Lithium ion battery; Heat dissipation structure; Computational fluid dynamics