The working life and reliability of power battery is very important to the electric vehicle. Based on the way of liquid cooling

a set of simple of heat management unit for power battery is designed and developed

and the feasibility of the scheme is confirmed by software simulation

laboratory test and vehicle loading test. The study shows that the air-conditioning wind and environmental wind of the bus can be cooled to the cryogenic heat exchanger in summer and the two quarter of spring and autumn

which can match the requirements of the power battery to the refrigeration capacity in different environments. Under the two conditions of laboratory and vehicle loading

the refrigerating capacity of the unit under the design condition is more than 2.5 kW

and the error between the actual power and the set power is less than 2% when the unit is heated by PTC. When the unit is loaded

the length of the intake tube is less than 2 m and the number of the 90°bend of the wind pipe is less than 2

the heat exchange still satisfies the design requirements. The guide plate of the inlet air is also optimized

the air inlet can be evenly distributed on the surface of the low temperature heat exchanger when the angle of the guide plate is 73°.