FULL CHARGE CAPACITY CORRECTION CIRCUIT, CHARGING SYSTEM, BATTERY PACK AND FULL CHARGE CAPACITY CORRECTION METHOD

摘要

A full charge capacity correction circuit including: an integrating unit that calculates an integrated current value of a rechargeable battery; a capacity storing unit that stores a full charge capacity value of the rechargeable battery; a first estimating unit that estimates a storage ratio of the rechargeable battery, which is a ratio of a quantity of stored electricity to an actual full charge capacity, as a first storage ratio when an estimable condition which is a condition that enables to estimate the storage ratio is satisfied; a second estimating unit that estimates a storage ratio when the estimable condition is satisfied after the first storage ratio is estimated, as a second storage ratio; a full charge capacity correction unit that estimates a new full charge capacity value of the rechargeable battery based on a difference integrated value that is an integrated value integrated by the integrating unit for a period after the first storage ratio is estimated and until the second storage ratio is estimated by the second estimating unit and on a ratio of a difference between the first storage ratio and the second storage ratio to 1, and stores the estimated new full charge capacity value in the capacity storing unit; an open circuit ratio estimating unit that uses a condition in which the rechargeable battery is in an open circuit state, as the estimable condition, and estimates the storage ratio based on a terminal voltage of the rechargeable battery when the estimable condition is satisfied; and a correction control unit that uses the open circuit ratio estimating unit as the first estimating unit or the second estimating unit.