This publication presents models for dynamic, 3-dimensional simulation of the thermal runaway, thermal propagation and the electro-thermal behaviour of battery cells. An optional and replaceable electrical equivalent circuit diagram describes the electrical behaviour of the battery cell. Coupled with the 3-dimensional, thermal equivalent circuit diagram, consisting of a resistance-capacitance network, the thermo-electric behaviour is represented. A special feature of the battery cell model is the optional, replaceable and physical model of the thermal runaway based on Arrhenius equations and the associated mass loss. This means that either the thermo-electric or the thermal runaway behaviour or both can be simulated in combination if required. The anisotropic thermal conductivity of the battery cell and the modelling of relevant heat conduction paths, such as the path across the housing of the battery cell, is made possible by 3D dis-cretization of the battery cell.