Voltage Difference Index Modeling of Charge-Discharge Energy Efficiency Degradation of Lithium-ion Batteries

A large amount of variable renewable energies has been introduced, simultaneously, the energy storage, for example, lithium-ion batteries became necessary because of the fluctuation and surplus of them. For efficient use of them, we studied the method of charge-discharge energy estimation. It was constructed as a method applicable to any current and state of charge sections. According to the analytical studies of estimation error characteristics, it was suggested that this method was suitable to the stable lithium-ion batteries aimed to absorb the photovoltaic energy surplus. © 2022 The Institute of Electrical Engineers of Japan.