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Based on the Thermal Runaway (TR) experiments conducted in our laboratory a simple method of describing a battery's thermal behaviour was developed. In the approach -which we call simple tracing methodthe temperature rate measurement from Accelerating Rate Calorimetry (ARC) during a TR experiment is approximated to determine the thermal behaviour of the model. This method was implemented in Modelica using Dymola. Alongside the implementation of the TR model a complete Modelica package with useful models for TR propagation simulation was developed. The package called "BatterySafety" serves as a foundation for further model development to investigate TR propagation and physical counter measures in greater detail. The focus of all the models in the package was efficiency, intelligibility and user-friendliness. With this approach we are able to simulate TR propagation of a complete battery pack.