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

摘要： 电动汽车内电池组热管理十分重要，能够及时将热量散发出去保持电池包温度的稳定， 就能在很大程度上解决电动汽车自燃爆炸的问题。论文设计一种电池风冷散热结构，通过对 串行及并行风道进行一系列的优化设计，得出一种散热性更好的散热结构。通过 ANSYS Fluent 软件进行建模及仿真分析，通过附加散热孔、改进进风口位置及倾角进行结构优化，结果表 明进风口倾角为 8°时散热性及结构最优，其生热情况为在 1 C 充电倍率下电池组最大温差为 3.9 ℃，最高温度为 33.7 ℃，最低温度为 29.8 ℃。

关键词: 电动汽车；风冷；锂离子电池；散热结构；流体动力学