Patent ID: 7605564

Claim:
A battery residual capacity information feeding device comprising: residual capacity holding means for holding a battery residual capacity of a battery pack; temperature measuring means for measuring a temperature in the battery pack; residual capacity correcting means for generating a correction quantity of the battery residual capacity on the basis of the temperature and the battery residual capacity, to feed the battery residual capacity corrected with the correction quantity; a unit correction quantity table for holding the correction quantity of the battery residual capacity per unit time in accordance with the temperature and the battery residual capacity, as a unit correction quantity; and time measuring means for measuring the unit time, wherein, the residual capacity correcting means acquires the unit correction quantity by referring to the unit correction quantity table on the basis of the temperature and the battery residual capacity, thereby to use the acquired unit correction quantity as the correction quantity of the battery residual capacity, the residual capacity correcting means performs the correction of the battery residual capacity each time the unit time is measured by the time measuring means, and the residual capacity correcting means shifts to an idle state under a predetermined condition and releases the idle state each time the unit time is measured by the time measuring means to perform the correction of the battery residual capacity.