Battery Sizing Calculation and Consideration for The Electric Apron Bus System

In this study, battery sizing calculation and consideration for an electric apron bus (EAB) is presented. An accurate estimation of the EAB’s battery can achieve the target mileage of the vehicle, and rightsizing the battery capacity can reduce the capital cost of an electric bus. The simulation developed includes powertrain and longitudinal vehicle dynamics. The auxiliary components are modeled with constant power. Several battery capacity configurations based on the availability of battery cells in the market are desired: 182.8 kWh, 193.5 kWh, 215 kWh, 221.5 kWh, and 258 kWh. Then the simulation was validated using several standardized drive cycles, such as arterial, CBD, and US-OCTA drive cycles, from NREL datasets and also at constant speed. The battery capacity was evaluated in simulation by the target mileage of 100km. The battery capacity is also evaluated by the battery weight and price to determine the optimal battery capacity. From the result, 215 kWh of battery capacity is the selected battery size compared to the basic requirement in this EAB design.