Model-Based Design (MBD) is a process that enables fast and cost-effective development of dynamic and complex systems, including control systems, signal processing, communications systems on the one hand and mechanical systems on the other hand. In Model-Based Design, a system model is at the center of the development process, from development requirements through design, implementation, and testing. At each stage of design, the model is a reflection of the state of knowledge about the designed system. The model is an executable specification that you continually refine throughout the development process. This is especially important for complex systems whose operation is difficult to predict. through simulations performed on the model, we can therefore determine whether the development of the system is going well. Simulation shows whether the model works correctly. The General Model-based Design method has been applied to the design of an electric car. In addition, this method has been used to optimize the vehicle towards minimizing energy consumption and, consequently, increasing the range of the vehicle, which is a critical functional parameter for currently developed electric vehicles. The application of optimization methods in a combination with the Model-Based Design creating additional possibilities of verification of other calculation methods (eg FEM) used in the design of the vehicle.