Patent ID: 10845417

Abstract:
A battery management device includes an SOCv calculation unit that calculates a state of charge using voltage across both ends of a battery, an SOCi calculation unit calculates a state of charge by integrating currents flowing in the battery, and an SOCw calculation unit performs weighted addition of the battery's state of charges calculated by the SOCv and the SOCi calculation unit. An SOCi biased time calculation unit calculates an SOCi biased time based on one or a plurality of elapsed time from the end of a previous system operation or the end of charging or discharging during the previous system operation to the start of the current system, temperature, degree of degradation, and polarization voltage of the battery. The SOCw increases a weight of the state of charge of the battery calculated by the SOCi calculation while the elapsed time from the activation is within the SOCi biased time.