Pinpointing the thermal behaviors of lithium-ion battery cells is a premier work for the thermal design of vehicular traction battery pack. An experimental and numerical approach is developed in this paper to study the thermal behaviors of a prismatic hard-cased cell. A computational model of considering heat loss to analyze the cell heat generation rate was first established, correspondingly a measurement method was presented to reveal the cell heat-generating performance depending on the cell′s temperature evolution of each thermogenic part. A thermal model of considering the cell′s detailed physical specifications was established to numerically analyze the cell′s thermal profile. The results show that there exists an excellent effectiveness in present characterization technique to the cell thermal behaviors. The cell heat generation rate quadratically increases with ascending discharge rate and lower temperature. Effects of lugs and housing on the cell thermal distribution are exceedingly. The cell′s lower part temperature is higher when the cell discharges at the low-rate, however, this phenomenon will be opposite at the high-rate discharge. The present approach has higher cost-advantage to pinpoint the thermal behaviors of the prismatic hard-cased cells when comparing with several recent studies which using the costly calorimeters.

精确定位锂离子电池组的热行为是汽车牵引电池组热设计的首要工作。本文开发了一种实验和数值方法来研究棱柱形硬壳电池的热行为。首先建立了一种考虑热量损失来分析电池发热率的计算模型，并相应地提出了一种测量方法，以根据电池各生热部分的温度变化揭示电池发热性能。建立了考虑电池详细物理规格的热模型，以数值分析电池的热特性。结果表明，在目前的表征技术中，对电池的热行为具有优异的有效性。电池的发热率随着放电率的升高和温度的降低而成倍增加。接线片和外壳对电池热分布的影响非常大。当电池以低速率放电时，电池的下部温度较高，但是，在高速率放电时这种现象将相反。与使用昂贵的量热仪的几项最新研究相比，本方法具有更高的成本优势，可以精确地确定棱柱形硬壳电池的热性能。