PURPOSE: To charge a battery efficiently and each battery cell almost uniformly.
CONSTITUTION: When charging a battery 3 from a capacitor 6, an arithmetic unit selects battery cells to be connected to the capacitor 6 based on the capacitor voltage detected by a capacitor voltage sensor 7 and the terminal voltage of respective, battery cells 31, 32,..., 3n detected by battery voltage sensors 41, 42,..., 4n. That is, the arithmetic unit selects in such a manner that the sum of the terminal voltages of battery cells selected becomes lower than the capacitor voltage and that priority in selection is given to battery cells with lower capacitor voltages. The arithmetic unit controls each relay of battery cell selecting means 5 so as to connect the selected battery cells to the capacitor 6.
KAWAMOTO MUTSUMI
YAMAGUCHI KOZO
SUMIYA KOJI
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