Thermal management performance optimization of lithium-ion batteries combined with phase change materials and liquid cooling
Phase change materials have been widely studied in battery thermal management due to their good temperature control capabilities,but in high temperature environments and high discharge rates,it is difficult to rely solely on phase change materials to meet the requirements of thermal management.Therefore,a battery thermal management method with a mixture of phase change materials and cooling plates was designed and numerically simulated and compared with pure phase change cooling.The effects of distance and coolant inlet velocity on the maximum temperature of the battery and liquid fraction of phase change materials were investigated,and the charge-discharge cycle process was also investigated.The results show that the addition of liquid cooling solves the problems of battery temperature deterioration and intermediate battery heat accumulation caused by complete liquefaction of phase change materials under high temperature and high discharge conditions.Compared with pure phase-change cooling,the hybrid cooling can reduce the cell spacing to 3 mm when the coolant velocity is 0.5 m/s and the thermal management performance can be improved less by continuing to increase the cooling liquid velocity.At the same time,the addition of the liquid cooling plate can reduce the influence of the first charge-discharge cycle on the subsequent cycle process and increase the lifetime of the batteries.
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