为了提升电池包集成度以及有效能量密度,设计了无模组电池包和对称蛇形流道液冷板结构,同时探究了该电池包的冷却性能.研究结果表明电池包具有很好的冷却性能,能够满足2.0C放电工况的冷却需求.在中国轻型汽车测试循环(China Light Vehicle Test Cycle,CLTC)工况下小流量运行电池包温差为0.25 ℃左右.此外,基于该电池包开展了冷却液入口边界以及导热材料对电池包冷却性能影响的分析,研究发现不同放电倍率下的电池包有着不同的最佳入口水温与冷却液质量流量,该电池包导热结构胶最佳热导率为0.9 W/(m·K).
Design and Thermal Performance Analysis of Module-less Power Battery Pack
In order to enhance the integration and effective energy density of battery packs,a module-less battery pack and a symmetric serpentine channel liquid cooling plate structure were designed,and the cooling performance of the battery pack was investigated.The results showed that the battery pack had good cooling performance and could meet the cooling requirements under 2.0 C discharge conditions.Under the CLTC condition,the temperature difference of the battery pack during low flow operation was about 0.25 ℃.Furthermore,the influence of coolant inlet boundary and thermal conductive material on the cooling performance of the battery pack was analyzed based on the battery pack,and it was found that the battery pack at different discharge rates had different optimal inlet water temperature and cool-ant mass flow rate.The optimal thermal conductivity of the thermal conductive adhesive for the battery pack was found to be 0.9 W/(m·K).
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