CHARGING OF BATTERY UNIT AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a charger for battery unit which can conduct efficient charging up to a full charging condition with battery temperature restrained lower than a prescribed limit. SOLUTION: This charger is provided with a plurality of blower fans 4 for cooling a battery unit 1 constituted of a plurality of secondary batteries 2, and a control circuit 11 for adjusting the air volume of the blower fans 4. The control circuit 11 leads out fan air volume at which battery temperature will not exceed its prescribed limit by estimating the battery temperature at charging completion with the fan air volume used as a parameter, and outputs its results as the optimum output of the blower fan 4.