Impact of the Level of Homogenization in 3D Thermal Simulation on the Internal Temperature Distribution of Li‐Ion Battery Cells. Issue 6 (15th January 2021)

• Record Type: Journal Article
• Authors: Queisser, Oliver; Cloos, Lisa; Boehm, Friederike; Oehler, Dieter; Wetzel, Thomas
• Other Names: Wetzel Thomas guestEditor.; Bessler Wolfgang G. guestEditor.; Kamlah Marc guestEditor.; Nirschl Hermann guestEditor.
• Is Part Of: Energy technology. Volume 9:Issue 6(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-01-15
• Subjects: cooling strategies -- homogenization -- internal temperature distribution -- layered three-dimensional thermal models -- Li-ion battery cells; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202000915
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : 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. Abstract : The impact of geometry homogenization of lithium‐ion cells on the internal temperature distribution has not been studied in depth. This work presents a 3D thermal model containing seven different levels of homogenization and three conductive cooling strategies. The results indicate that the inner temperature distribution is the consequence of a strong interaction between stack homogenization, tab resolution, and cooling strategy.