Nowadays Battery Electric Vehicles are a fundamental field of research in science and technology, because of their contribution to sustainable development and decarbonization. Moreover, they enable flexible strategies concerning Electric Drive Unit and auxiliaries system control. Beside such clear opportunities, there is the challenge of complying with the available on-board energy sources, which need to be handled in a smart way. In this direction, building a model describing how the Thermal Management System behaves can help OEMs to seek for an improvement of the driving range, not only according to the homologating cycles, but for real life vehicle usage. Therefore the goal of this activity was to provide a tool allowing for the verification of such a system performance, whose reliability is crucial to be assessed also out of testing facilities, in order to keep the components safe and durable, and to achieve desirable system efficiency.