The lithium-ion battery pack is manufactured that many cells are connected in parallel or series to suit the purpose of use. Thus, the characteristics of the cells determine the output performance and stability of the pack. In particular, the cells that make up a battery pack are sensitive to the operating temperature. It is important to evaluate the temperature distribution in the environment in which the battery pack is operating and to review the proper cooling method when designing a battery pack. If do not maintain the suitable environment to operate battery, because of it is difficult to expect performance, or thermal runaway to fire or explosion. In this study, a battery pack thermal analysis model based on the battery cell test result was developed for two shapes between square and rectangular. The results of the thermal analysis were compared and verified by the experimental results. The internal temperature distribution was examined for both shapes of battery pack with the forced convection condition, which is used in the thermal model. The air layer inside the battery pack, generated by the cylindrical battery structure, neglects the natural convection effect based on the Rayleigh number, so that the model can be simplified to reflect only heat transfer by conduction. Through this study, it was confirmed that modeling of thermal analysis can be simplified by reflecting only heat transfer by the conduction of the inner air layer of the battery pack. Moreover, it was confirmed that the internal temperature distribution varies according to the shape of the battery pack, and that proper heat dissipation design requires consideration of the shape of the pack.

锂离子电池组被制造成许多电池并联或串联连接以适合使用目的。因此，电池的特性决定了电池组的输出性能和稳定性。尤其是，组成电池组的电池对工作温度很敏感。在设计电池组时，评估电池组工作环境中的温度分布并检查正确的冷却方法非常重要。如果不维持合适的环境来操作电池，则由于难以期待其性能，或因热失控而着火或爆炸。在这项研究中，基于电池单元测试结果的电池组热分析模型针对正方形和矩形之间的两种形状而开发。对热分析的结果进行了比较，并通过实验结果进行了验证。在热对流模型中，在强制对流条件下检查了两种形状的电池组的内部温度分布。由圆柱形电池结构产生的电池组内部的空气层忽略了基于瑞利数的自然对流效应，因此可以简化模型以仅反映通过传导的热传递。通过这项研究，可以确认仅通过反映电池组内部空气层的热传导就能简化热分析的建模。此外，已经确认内部温度分布根据电池组的形状而变化，