Secondary battery state determination method, secondary battery state determination device, secondary battery system, and charge / discharge control device having state determination device

摘要

The deterioration state of the secondary battery with respect to a practical current value is accurately determined. A state determination apparatus for a secondary battery having a positive electrode and a negative electrode, wherein a capacity reduction parameter group A is determined based on charge / discharge characteristics per a reference amount of the positive electrode and the negative electrode and a current value A, Secondary battery state determination device, secondary battery state determination method, secondary battery state determination device for determining resistance increase parameter group B based on charge / discharge characteristics, capacity decrease parameter group A, and current value B greater than current value A A charge / discharge control device having a system and a state determination device.