| 摘要 |
PROBLEM TO BE SOLVED: To make more reliable battery residual capacity displayed on a load apparatus, etc. SOLUTION: In keeping with the discharge of a secondary battery, an integration part 421 performs subtraction on the amount of discharged electric charge detected by a current detection resistance from the start of the discharge while a residual charge operation part 423 subtracts an integrated value thereof from residual charge at the point of discharge starting to find actual residual charge. Further, by finding the percentage of the actual residual charge to an actual residual charge stored in an actual capacity operation part 422, residual charge in % is found which is displayed on a load apparatus, etc. In this event, when the operation part 422 enhances determination accuracy on the residual charge by learning, as actual capacity, the amount of discharged electric charge found through integration by the integration part 421 in keeping with discharge from a fully charged state to an end stage of discharge, a prohibition part 45 prohibits the learning where the battery is left as it is for 96 hours or more from the fully charged state, the battery is charged in the middle of discharge, or the temperature of the battery is low. Accordingly, learning is prohibited in such a case where the learning increases error in the actual capacity, making it possible to enhance the determination accuracy on the actual capacity. COPYRIGHT: (C)2008,JPO&INPIT
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