하이브리드/전기 자동차 배터리 냉각 시스템의 냉각수 유동 특성이 냉각 성능에 미치는 영향에 대한 해석적 연구

초록

Average temperature and temperature uniformity in a battery cell are the important criteria of the thermalmanagement of the battery pack for hybrid electric vehicles and electric vehicles (HEVs and EVs) because high powerwith large size cell is used for the battery pack. Thus, liquid cooling system is generally applied for the HEV/EV batterypack. The liquid cooling system is made of multiple cooling plates with coolant flow paths. The cooling plates areinserted between the battery cells to reject the heat from batteries to coolant. In this study, the cooling plate withU-shaped coolant flow paths is considered to evaluate the effects of coolant flow condition on the cooling performanceof the system. The counter flow and parallel flow set up is compared and the effect of flow rate is evaluated using CFDtool (FLUENT). The number of counter-flows and flow rate are changed and the effect on the cooling performanceincluding average temperature, differential temperature, and standard deviation of temperature are investigated. Theresults show that the parallel flow has better cooling performance compared with counter flow and it is also found thatthe coolant flow rate should be chosen with the consideration of trade-off between the cooling performance andpressure drop.

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