Iwasaki Electric Co., Ltd.

Jps Co., Ltd

Tokyo Rectifier Co., Ltd.

Eiji Saiki

Tomomi Maruyama

Akitoshi Kato

Yoshihiro Honda

A charging device supplies charge current to a battery group having plural secondary batteries connected in series to perform charging. In the charging device, a discharge route circuit for discharging charge current to be supplied to the secondary battery when the battery voltage of the secondary battery exceeds a predetermined voltage while charging is provided to every secondary battery. Also provided is a cut-off circuit for cutting off the discharge route circuit from each secondary battery after charging is completed. Discharge at a discharge route circuit is suppressed and energy efficiency is increased.

Charging device

A charging apparatus for charging a cell group, in which a plurality of secondary cells are connected in series, by supplying a charging current Ic to the secondary cells is provided with an overcharge protection circuit including discharge route circuitsprovided to each of the secondary cells and adapted to cause the secondary cells to discharge during charging by connecting the secondary cells to the discharge route circuits based on cell voltages Vb of the secondary cells or to stop discharging by cutting off the secondary cells from the discharge route circuits; and a charger controller for continuing charging while reducing the charging current Ic until the discharge of the secondary cell having started discharging to the discharge route circuit is stopped when the discharge of any one of the secondary cells to the discharge route circuit is started by the overcharge protection circuit.

Charging apparatus having gas generation detector and charging method for the same

The present invention aims to suppress waste of charging power during charging and improve charging efficiency. A charging apparatusfor charging a cell group, in which a plurality of secondary cellsare connected in series, by supplying a charging current Ic to the secondary cellsis provided with an overcharge protection circuitincluding discharge route circuitsprovided to each of the secondary cellsand adapted to cause the secondary cellsto discharge during charging by connecting the secondary cellsto the discharge route circuitsbased on cell voltages Vb of the secondary cellsor to stop discharging by cutting off the secondary cellsfrom the discharge route circuits; and a charger controllerfor continuing charging while reducing the charging current Ic until the discharge of the secondary cellhaving started discharging to the discharge route circuitis stopped when the discharge of any one of the secondary cellsto the discharge route circuitis started by the overcharge protection circuit

Charging apparatus having overcharge protection and charging method for the same

The present invention aims to reliably prevent overcharge by carrying out charging in just proportion during charging periods. A charging apparatusfor charging a secondary cellby supplying a charging current Ic thereto is provided with a discharge amount detectorfor detecting an amount of power discharged from the secondary cell in a non-charging state, a charge amount detectorfor detecting an amount of power charged into the secondary cell in a charging state, and a charger controllerfor stopping charging when the amount of charged power (charge amount Wc) becomes equal to the amount of discharged power (discharge amount Wc) during a charging period.

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Konosu, Japan

Eiji Saiki