Investigation of li-ion battery state of health detection in electric vehicles - a comparison of simulation results and field measurement

Battery state of health estimation is a very important issue related to electric vehicle operation. A knowledge of the progression of the battery state of health in an electric vehicle operation is highly desirable as a reduced battery state of health limits the practical and economic operation of the vehicle. The aim of this approach is the parametrization of a holistic battery aging model. The model can be used to derive the progression of the state of health for a desired operation. It is validated with a measurement of the state of health of one battery pack during a field test. A test set up including a chassis dynamometer for the measurement of the battery capacity is used. The results show that the lifetime of the electric vehicle battery can be prolonged significantly.