The increasing adoption of electric vehicles and stringent global sustainability targets highlighted the challenge of improving energy efficiency, particularly through an optimisation of the thermal management system. Considering this, the aim of this thesis is to develop in Matlab/Simulink a model of the Thermal Management System (TMS) that can serve as a foundation for the future implementation of a Model Predictive Control (MPC) strategy, designed to maximise energy efficiency while keeping the battery and cabin within the desired thermal limits. To achieve this, two complementary modelling approaches are developed: a Physics-based model and a data-driven model. The Physics-based model is based on fundamental thermodynamic laws and is implemented using simplified equations.