Abstract
In this paper, a novel liquid cooling based thermal management system for the cylindrical lithium-ion battery module with variable contact surface is designed. Contact surface size is determined by aluminum block length. The cooling system relies on aluminum block which can effectively transfer heat from battery to cooling water. A battery module with six cells along flow channel is chosen to study the effects of aluminum block length and velocity on the thermal performance in the way of simulation. Three change types of contact surface are studied and their performance are compared with the system with constant contact surface at different inlet velocities. The results indicated that the system with variable contact surface is superior to the system with constant contact surface. It can significantly improve temperature uniformity. When inlet velocity is 0.05m/s, the maximum temperature can decrease to the same value and temperature difference decreases by 6%, 14% and 28%. Finally, an optimal design is presented with system weight, pump power consumption and cooling performance taken into consideration.
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