Research on performance of lithium battery module based on immersion cooling thermal management system
The temperature gradient caused by the inconsistency of the cells changes the internal electrical property of the module.Taking the actual energy storage container as an example,experimental platform and Matlab/Simulink theoretical analysis model for immersion cooling thermal management of battery module with two in series and three branches in parallel were built to study the effect of immersion cooling on cells electro-thermal performance.The results show that the maximum temperature of the module can be kept below 40℃by immersion cooling at the discharge rate of 3C.When the battery is inconsistent,the temperature equalization effect of the module presents a trend of natural air cooling<static immersion cooling<forced flow immersion cooling.In the test group,the temperature equalization of the module under 1 L/min forced flow immersion is the best which is maintained above 91.39%.The greater the inconsistency of the initial state of charge(SOC)and DC internal resistance of the battery,the worse the temperature and voltage equalization of the module.SOC inconsistency has greater damage to the equalization of module compared with DC internal resistance.
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