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为延长动力电池循环寿命,提升电动汽车整车热安全特性,本文采用实验与数值模拟相结合的方法,分析了基于相变材料热管理的LiFePO_4动力电池散热性能。结果表明,电池模块的最高温度以及局部温差受相变材料导热系数与相变材料用量影响较大;相变材料导热系数足够大时,相变材料相变温度与环境温度差值越小,电池模块局部温差越小,但最高温度变化不大;环境温度过高时,相变材料能有效阻滞环境热量进入电池模块。
In order to prolong the cycle life of power battery and improve the thermal safety characteristics of EV, the thermal performance of LiFePO_4 power battery based on thermal management of phase change material is analyzed in this paper by combining the experiment and numerical simulation. The results show that the maximum temperature and the local temperature difference of the battery module are greatly influenced by the thermal conductivity and the amount of phase change material of the phase change material. When the thermal conductivity of the phase change material is large enough, the difference between the phase change temperature and the ambient temperature of the phase change material is smaller. Module temperature difference is smaller, but the maximum temperature changes little; ambient temperature is too high, the phase change material can effectively block the ambient heat into the battery module.