CHARGING SYSTEM AND BATTERY PACK

摘要

A charging voltage or an overcharge determination value for determining an overcharge state is set taking into consideration the states of secondary battery cells (21a-21d) of a battery pack (20) during charging. Charging of the secondary battery cells is then carried out using charging voltages set taking into consideration the states of the secondary battery cells. It is then determined whether or not the secondary battery cells are in an overcharged state using overcharge determination value is set taking into consideration the states of the secondary battery cells.