THE MEASURMENT METHOD OF BATTERY SOC

摘要

PURPOSE: A measurement method of a SOC(State Of Charge) state of a battery is provided to accurately measure a SOC value by preventing continuous error accumulation of a calculated SOC value according to the increase of a charge and discharge cycle. CONSTITUTION: An estimation OCV(Open Circuit Voltage) voltage related to a charge and discharge current is calculated according to time. A correlation table of estimation OCV and SOC values is mapped corresponding to discharge time. A charge and discharge current total accumulation amount in a battery are added or subtracted and SOC is produced. The correlation table of the SOC values is periodically corrected if a full charging condition is satisfied or a calculated SOC value arrives a predetermined correction point.