Abstract: In order to study the problem of heat accumulation and uneven heat distribution during operation of lithium-ion batteries, on the basis of parallel flow air cooling, ANSYS AIM software is used to simulate the temperature of the battery pack with different wedge-shaped air inlet inclination angles and adding spoiler. The effects of the inclination angle of the air inlet, the inclination angle and position of the spoiler on the heat dissipation performance of the battery pack and the temperature distribution were studied. The relatively high temperature of the battery decreases with the increase of the inclination angle of the air inlet, the temperature difference of each part of the battery also decreases, the temperature distribution range is significantly shortened, and turns to low temperature. After adding spoiler, the relatively high temperature of the battery is significantly reduced, and the temperature difference is between 2.0~3.4 ℃. After the spoiler is set at a certain position, most of the battery temperature points are concentrated between 27.1~28.0 ℃, followed by 26.1~27.0 ℃, and finally 28.1~29.0 ℃. Under the above conditions, the uniformity of battery temperature distribution is significantly improved.

Key words: lithium-ion power battery, parallel flow air cooling, spoiler, temperature