CHARGING AND DISCHARGING CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a charging and discharging control system which will not make wrong decision in the degradation of a secondary battery. SOLUTION: The charging and discharging current I a secondary battery and the charging and discharging voltage V of the same are measured at regular intervals (S112), and the measured values are stored in a nonvolatile RAM. The internal resistance R of the battery is calculated (S122) by the regression analysis of the constant amount of the stored measurement data. The accumulated electric charge quantity or the accumulated electric discharge quantity of the battery is calculated from the integrated value of the charging and discharging current; and the degradation state of the battery is decided, based on the calculated values of the internal resistance R and the accumulated electrically charged and discharged quantity (S128). COPYRIGHT: (C)2004,JPO&NCIPI