| 摘要 |
PROBLEM TO BE SOLVED: To suppress overcharge when recharge of a fully charged battery is repeated, in a charger which performs constant-current charge in at least a part of a charging process like constant-current/constant-voltage charge. SOLUTION: Preliminary charge is performed at a current value I2 only for a predetermined period T1, immediately after starting charge, before performing the regular constant-current charge, wherein the value I2 is smaller than a current value I1 used in the constant-current charge. When a target voltage V1 is reached in the preliminary charge at which the constant-current charge and the constant-voltage charge are switched, the charger judges the battery to be fully charged, and suspends charging. With such constitution, if the fully charged battery is loaded, the target voltage V1 may be exceeded in the constant-current charge by the current value I1 of a larger current as before, whereas in the charger, a charging electric charge flowing into the battery at the small current value I2 is made to be reduced than before, by which the overcharge caused when the recharge of the fully charged battery is repeated is suppressed. COPYRIGHT: (C)2007,JPO&INPIT
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