CONTROL DEVICE FOR STORAGE BATTERY

摘要

PROBLEM TO BE SOLVED: To solve the problem that when a charge/discharge amount is small, it is not possible to accurately calculate the full charge capacity of a battery.SOLUTION: The control device of a storage battery includes: performing charge/discharge such that the charge state of a battery is equal to or more than a predetermined value; calculating a first charge state prior to discharge; calculating the discharge amount of the battery by performing discharge; calculating a second charge state posterior to discharge; and calculating a full charge capacity from the discharge amount on the basis of the fluctuation amounts of the first charge state and the second charge state. A range in which a difference between a first correspondence relation between an open voltage and the charge state posterior to the discharge of the battery and a second correspondence relation between the open voltage and the charge state posterior to the discharge of the battery is small is set as a predetermined range, and charge/discharge is performed such that the charge state of the battery is kept within the predetermined range to calculate the full charge capacity.