Patent ID: 9291679
Filing Date: 2016-03-22
CPC Classification: G01R,H01M,H02J,Y02E

Claim Text:
1. A battery state estimation device comprising: a measured value acquisition unit for acquiring a measured current value which is a measured value of a current flowing to a battery part and a measured voltage value which is a measured value of a terminal voltage of the battery part; a first open-circuit voltage estimation unit for estimating an open-circuit voltage value of the battery part on the basis of the measured voltage value and the measured current value, or estimating the open-circuit voltage value of the battery part on the basis of a remaining capacity of the battery part estimated from an integrated value of the measured current value, in a first period during which charge or discharge of the battery part is performed; and a second open-circuit voltage estimation unit for estimating the open-circuit voltage value of the battery part on the basis of the measured voltage value and an estimated open-circuit voltage value by the first open-circuit voltage estimation unit, in a second period during which the charge and discharge of the battery part are stopped, after the first period.