Abstract: With regard to heat dissipation of Ni-MH batteries,a creative design adopting the tube-in-tube liquid cooling for the BTMS has been presented,based on the analysis of the thermal management system of the battery pack for HEVS home and abroad.The design efficient and economical,and all the designs of the parts and the system have been completed.A battery model has been built and compartmentalized with the mesh in GAMBIT.The result of the flow simulation in FLUENT shows that this cooling system ca...