Electric storage device, electronic device, power system, and electric vehicle

摘要

An electric storage device includes an electric storage unit that includes one or a plurality of electric storage elements, a measurement unit that measures voltage, a current, and a temperature of the electric storage element, and a calculation unit that calculates internal resistance of the electric storage element based on the voltage, the current, and the temperature measured by the measurement unit. When a determination unit detects discontinuity of temporal variation of the calculated internal resistance, it is determined that the electric storage element has been exchanged. Since the electric storage element such as a lithium ion secondary battery has such a characteristic that the internal resistance increases as the number of use is increased, the exchange of batteries can be detected from the change in the internal resistance.

主权项

1. An electric storage device comprising:
an electric storage unit that includes at least one electric storage element; a measurement unit configured to measure a temporal voltage, a temporal current, and a temporal temperature of the electric storage element; a calculation unit configured to calculate an internal resistance of the electric storage element based on the temporal voltage, the temporal current, and the temporal temperature measured by the measurement unit; and a determination unit configured to determine whether the electric storage element has been exchanged based on a discontinuity of temporal variation of the internal resistance.