Battery control apparatus and battery control method

A battery control apparatus comprising:

• a voltage detection unit that measures a voltage of each of cells;
• a charging rate calculation unit that calculates a charging rate of each of the cells based on the measured voltage and a charging-rate to voltage table which is stored in a storage unit;
• a current integration unit that calculates an integrated current value by integrating current values of a battery pack configured with a plurality of the cells;
• a cell capacity estimation unit that calculates a battery capacity value of each of the cells based on the integrated current value, and the charging rate of each of the cells;
• a dischargeable capacity value calculation unit that calculates a dischargeable capacity value of each of the cells from the battery capacity value and charging rate thereof;
• and
• a control unit that controls charging or discharging of the battery pack based on the dischargeable capacity value of each of the cells
• a remaining capacity comparison unit that compares the dischargeable capacity value and a predetermined target remaining capacity value,
• wherein the control unit, as a result of the comparison between the dischargeable capacity value and the target remaining capacity value, discharges a cell having the dischargeable capacity value larger than the target remaining capacity value until the dischargeable capacity value reaches the target remaining capacity value.