Modelling, Simulation and Validation of thermal propagation for 3D discretized battery cells in Modelica

Abstract

This publication presents models for dynamic, 3-dimensionalsimulation of the thermal runa-way, thermal propagation andthe electro-thermal behaviour of battery cells. An optionaland replaceable electrical equivalent circuit diagramdescribes the electrical behaviour of the battery cell.Coupled with the 3-dimensional, thermal equivalent circuitdia-gram, consisting of a resistance-capacitance network,the thermo-electric behaviour is repre-sented. A specialfeature of the battery cell model is the optional,replaceable and physical model of the thermal runaway basedon Arrhe-nius equations and the associated mass loss. Thismeans that either the thermo-electric or the thermalrunaway behaviour or both can be simulated in combinationif required. The ani-sotropic thermal conductivity of thebattery cell and the modelling of relevant heat conductionpaths, such as the path across the housing of the batterycell, is made possible by 3D dis-cretization of the batterycell.