VeloCité - Development of an energy storage system for an e-bike

Within the framework of the development of an energy storage system for a lightweight electric bicycle the electric behavior of LiFePO4 cells was investigated. We propose a systematic and efficient procedure for identification and parameterization of a cell model based on measurements in the time domain. An equivalent circuit model approach was adopted using parameters dependent on temperature and state of charge. The model was parameterized for a wide range of operational conditions concerning temperature, state of charge and cell current. Finally, the accuracy of the proposed model is shown by the comparison of simulation results with real measurements of the given cell using a highly dynamic driving cycle.