Impact of the Level of Homogenization in 3D Thermal Simulation on the Internal Temperature Distribution of Li-Ion Battery Cells,Energy Technology

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Impact of the Level of Homogenization in 3D Thermal Simulation on the Internal Temperature Distribution of Li-Ion Battery Cells
Energy Technology ( IF 3.6 ) Pub Date : 2021-01-15 , DOI: 10.1002/ente.202000915
Oliver Queisser ₁ , Lisa Cloos ₁ , Friederike Boehm ₁ , Dieter Oehler ₁ , Thomas Wetzel ₁

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Temperature is an important factor for an optimal battery performance. To gain knowledge about the internal temperature distribution in a battery, many thermal simulation studies are performed. Among other factors, they differ in the level of homogenization (LoH) of the geometry, which directly influences the computing time. However, the effects of different LoH, in particular of the cell layers, on the modeling and prediction quality of the temperature field are scarcely investigated. This work discusses the effect of different LoH of the cell stack on a numerical 3D thermal battery model for different thermal management strategies. A new approach of reducing the number of cell layers of the pouch cell geometry while keeping their volumetric proportions constant is proposed. It is clearly shown that the LoH has a large impact on the thermal transport paths, especially through the current collectors and tabs, and therefore on the predicted internal temperature distribution. In addition, the effect of the LoH differs for different thermal management strategies, because they affect the heat transport paths as well.

中文翻译：

3D 热模拟中的均质化水平对锂离子电池单元内部温度分布的影响

温度是获得最佳电池性能的重要因素。为了获得有关电池内部温度分布的知识，进行了许多热模拟研究。除其他因素外，它们在几何的均质化 (LoH) 水平上有所不同，这直接影响计算时间。然而，几乎没有研究不同 LoH，特别是细胞层对温度场建模和预测质量的影响。这项工作讨论了电池组的不同 LoH 对不同热管理策略的数值 3D 热电池模型的影响。提出了一种减少软包电池几何形状的电池层数量同时保持其体积比例恒定的新方法。清楚地表明，LoH 对热传输路径有很大影响，尤其是通过集电器和极耳，因此对预测的内部温度分布有很大影响。此外，LoH 的影响因不同的热管理策略而异，因为它们也会影响热传输路径。

更新日期：2021-01-15

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