Patent ID: 8917060

Claim:
A secondary cell control system comprises: a plurality of cells; a charging circuit section configured to charge cells selected from among said plurality of cells; a discharging circuit section configured to discharge cells selected from among said plurality of cells; a cell voltage calculating circuit section configured to calculate control cell voltages based on cell voltages of said plurality of cells or to directly determine the cell voltages as said control cell voltages, with respect to each of said plurality of cells; and a control circuit section configured to select the cells to be charged and the cells to be discharged from among said plurality of cells in response to said control cell voltages, and wherein said control circuit section determines a target cell voltage, selects the cells to be discharged based on a comparison result between said control cell voltages and a first threshold value defined by using the target cell voltage, and selects the cells to be charged based on a comparison result between said control cell voltages and a second threshold value defined by using the target cell voltage, wherein the selection of the cells to be discharged by said control circuit section is carried out based on a comparison result of said control cell voltages and a third threshold value defined by using a minimum value of said control cell voltages in addition to the comparison result of the first threshold value and said control cell voltages, and wherein the selection of the cells to be charged by said control circuit section carried out based on a comparison result between said control cell voltages and a fourth threshold value defined by using a maximum value of said control cell voltages in addition to the comparison result between the second threshold value and said control cell voltages.