Abstract: A mathematical model of heat generation and heat dissipation of battery packs was set up for the battery packs of battery powered alternating current (AC) load haul dump to solve the problem of severe heat generation due to its large capacity and a long working time. The heat dissipation effect of battery packs was investigated under the condition of normal cycle and 1 C charge and discharge. And it was also studied that the influence of air outlet position, air outlet size and partition width on the heat dissipation of battery packs. The results show that the maximum temperature of battery packs reaches 63 ℃ when battery packs are under the condition of 1 C continuous charging and discharging. The best heat dissipation is achieved when an air outlet is located on left and right sides of the third floor leading, but that of the other two floors of battery packs has not been improved significantly. The overall heat dissipation of the battery packs is the best and the maximum temperature is reduced by 7.7% when the gap width of the separator is 10 mm and the length of the air outlet is 800 mm.

Key words: engineering vehicle, battery powered alternating current (AC) load haul dump, battery packs, heat dissipation structure, air cooling