SET BATTERY CONTROL METHOD AND SET BATTERY CONTROL CIRCUIT AS WELL AS CHARGING CIRCUIT AND BATTERY PACK HAVING THE SET BATTERY CONTROL CIRCUIT

摘要

A set battery control circuit includes: 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; and an imbalance reduction processing portion that performs imbalance reduction processing at set timing preset as timing at which terminal voltages across the plurality of secondary batteries become voltages at or below a cut-off voltage of discharge preset as a voltage at which discharge is to end in such a manner that a secondary battery having a terminal voltage higher than a lowest voltage, which is a lowest terminal voltage among the terminal voltages across the plurality of secondary batteries detected by the voltage detection portion, is discharged by means of the discharge portion so that a difference among the terminal voltages across the respective secondary batteries is lessened.