Patent ID: 8120319
Filing Date: 2012-02-21
Classification: H02J

Abstract:
1. A set battery control circuit comprising: a voltage detection portion that detects a terminal voltage across each secondary battery in a set battery formed by connecting a plurality of secondary batteries in series; a discharge portion that discharges the plurality of secondary batteries; a charge and discharge control portion that causes the voltage detection portion to detect the terminal voltages across the plurality of secondary batteries while the set battery feeds a current to a load, determines a lowest terminal voltage among the terminal voltages across the plurality of secondary batteries detected by the voltage detection portion, causes the set battery to stop feeding the current to the load when at least one of the terminal voltages across the plurality of secondary batteries has dropped to or below a cut-off voltage of discharge preset as a voltage at which discharge is to end, and an imbalance reduction processing portion that performs imbalance reduction processing, at set timing preset as timing at which or after the feeding of the current to the load from the set battery is stopped by the charge and discharge control portion and as timing before the set battery is charged in which a secondary battery having a terminal voltage higher than the lowest terminal voltage is discharged by means of the discharge portion so that a difference among the terminal voltages across the respective secondary batteries is lessened.