Internal temperature distribution in lithium-ion battery cell and module based on a 3D electrothermal model: An investigation of real geometry, entropy change and thermal process. (1st August 2023)

• Record Type: Journal Article
• Authors: Tardy, Erwan; Thivel, Pierre-Xavier; Druart, Florence; Kuntz, Pierre; Devaux, Didier; Bultel, Yann
• Is Part Of: Journal of energy storage. Volume 64(2023)
• Publication Date: 2023-08-01
• Subjects: Lithium-ion cell and module -- Electrothermal model -- Entropy change -- Internal cell geometry -- Temperature distribution; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2023.107090
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: The temperature of lithium-ion cell and module has a significant impact on performance and ageing. Therefore, it is crucial predicting the temperature distribution and evolution of lithium-ion batteries. However, most of the electrothermal models consider a simplified cell geometry. In this work, a 3D electrothermal model of prismatic cells is developed based on the internal geometry reconstructed from tomography. The numerical results for one single cell and a module of 12 cells in series (12S) are compared to experimental measurements for charge and discharge at different current-rates (C-rates). This study shows a cooling process due to entropy change at low C-rate while at higher C-rate the Joule effect is predominant. The real cell geometry highlights the non-uniform temperature distribution induced by the inert gas and anisotropic thermal conductivity of the jelly roll. Finally, higher internal temperatures are observed in the module because of its architecture. Graphical abstract: Unlabelled Image Highlights: A 3D electrothermal model of a prismatic graphite/NMC Li-ion battery is proposed. The real internal geometry of the cell is reconstructed from tomography. Entropy change can act as an active cooling process at low C-rate. Inert gas acts as a thermal resistance which insulates the inner part of the cell from the casing. Higher internal temperatures are observed in the module because of its architecture.