The utility model relates to a thermal management technique field of electric automobile power battery group especially relates to a batteries of electric vehicle thermal management system based on phase change material soaking and heat storage technology. Install on the car to be connected with the ECU of car, constitute by soaking module, heat -retaining module, water supply module, cooling system L and heating system R, cooling system L governing valve, heating system R governing valve, cooling system L temperature sensor, heating system R temperature sensor and water supply module switching -over valve link to each other with automotive electronics the control unit ECU and constitute temperature control loop. Use the utility model discloses, improved temperature uniformity and the cooling and the rate of heating of battery monomer and group battery, had high temperature cooling function and low temperature heating function simultaneously, reduced energy consumption, reduced the capacity of group battery and the harm in life -span, the present invention has simple structure and low cost.