The Design Of Heat Radiation Structure And Simulation Of Cooling System For EV’s Li-Ion Power Battery

Because of its performance benefits in various aspects, Li-ion battery is widely used in EVs. But how to dissipate the heat produced by the batteries during working is a question which can not be avoided. If the temperature of batteries is too high, it may influence batteries’ performance and life, even lead to safety problems. In this paper the thermal behavior and temperature distribution of battery and battery bag was analyzed. This paper also does a research on the thermal behavior of battery when there are fins on the battery’s shell and the performance of the battery bag with air cooling system. The main content of this paper are as follows:1. Introduce some common power battery, focus on the parameters of Li-ion battery such as:characteristic, principium, material and exothermic. Li-ion battery’s mathematical model of heat is established based on heat-transmit theory.2. The thermal behavior of single Li-ion battery is analyzed by using Ansys. Compared with the results of Battery manufacturers’test, the method’s veracity is validated.3. Based on the design method of fins, add fins on the shell of battery, then the thermal behavior of battery with fins is simulated in Ansys. Compared with battery without fins, the effect of fins is analyzed.4. Based on the size of the battery bag and the batteries’ arrangement in the bag, the temperature distribution of the bag during0.3C discharge rate is simulated in Ansys. Simulated the flow field of4kinds of air-cooling systems, then contrast the effect of these4systems. Based on the results, some proposals are put forward.The results in this paper have some application value in research of battery’s thermal behavior, heat radiation structure design, battery bags’ cooling system design and overall design.