| 摘要 |
PROBLEM TO BE SOLVED: To display a precise residual capacity according to the characteristic of each cell. SOLUTION: This residual capacity meter for pack battery 1 having a plurality of cells 11-1n connected in series to each other which displays the residual capacity Qz of the pack battery 1 has terminal voltage monitoring means 61-6n, 7 for monitoring the periodΔt of changing the terminal voltage VC of either one of the cells 11-1n from a prescribed voltage v1 to another prescribed voltage v2, and a current measuring means 5 for measuring the discharge current I of the pack battery 1. Further, it also has a quantity-of-electricity arithmetic means 3 for calculating the quantity of discharge electricityΔQ of the pack battery 1 for the periodΔt on the basis of the discharge current I, a capacity reducing ratio arithmetic means 3 for calculating the capacity reducing ratioηof the pack battery 1, and a residual capacity correcting means 3 for correcting the residual capacity Qz according to the capacity reducing ratioη.
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