This system uses vortex tube cooling and heating technology to control the thermal management of electric vehicle power battery. Through the recovery of the braking energy of the electric vehicle, highpressure air form Inner and outer eddy currents in the vortex tube，and the required hot and cold air flow was obtained, then effectively preheating or cooling the battery pack. At the same time, through the optimized design of the power battery structure, the temperature inside each unit battery was kept consistent, and the power battery was ensured to work at the optimum temperature. This system can effectively improve the safety, lifespan and cruising range of electric vehicles．