In this paper a complete vehicle thermal system of BEV battery electric vehicle is presented using 1D method. A battery electric vehicle (BEV), pure electric vehicle, only-electric vehicle, fully electric vehicle or all-electric vehicle is a type of electric vehicle (EV) that exclusively uses chemical energy stored in rechargeable battery packs, with no secondary source of propulsion
All relevant components from battery, inverter, electric motor, gear box, vehicle, driver, refrigerant loop, cabin cooling, chiller, battery heater, DC-DC with auxiliary loads sensors and control system is considered in the simulation.
The vehicle is built for HVAC refrigerant loop, battery coolant loop and electric power train loop (EPT) with driving cycle control and vehicle model. The thermal components are stacked from Grill, radiator, condenser, cooling fan and engine back resistances. The airflow to the radiator is computed for different vehicle speed. The condenser capacity is calculated from cabin temperature requirements and the chiller requirements to meet the battery cooling. The radiator capacity is calculated from the EPT heat rejections based on various drive cycle. The fan wattage is selected for AC requirements and vehicle drive conditions. The fan logics are derived for optimal fan power consumption.
The model is run for different drive cycles and charging cycles and various thermal performance measured. The main objective is to optimize the thermal components for optimal power consumption to reduce the energy consumption and increase the range. Also to reduce the vehicle road test and bring it to the vehicle simulation to the desktop. The paper presents an electric powertrain simulation platform developed under Siemens Amesim.