Method of and apparatus for implementing capacity adjustment in battery pack

摘要

The lowest voltage value among the open circuit voltages at cells constituting a battery pack is set as a capacity adjustment target value. Each cell is discharged over the length of time corresponding to the deviation of its open circuit voltage from the capacity adjustment target value. The voltage at a cell manifesting a voltage reduction that is larger than those at a majority of remaining cells but is still within the normal range is set closer to the level of the voltages at the majority of remaining cells over time. If, on the other hand, an open circuit voltage is lowered to an extent exceeding a first threshold value, from the range set by the cell error decision-making reference value ascertained by averaging the cell voltages excluding the highest voltage value and the lowest voltage value, then the decision is made that an abnormal voltage reduction has occurred.