| 摘要 |
PURPOSE: A method is provided to secure a reliability for applying of an SOC reference value regardless of capacity change owing to continuous use of a battery by measuring a drop voltage variation of a time constant and extracting a point where a drop voltage is converged to 0V. CONSTITUTION: A battery voltage state is detected(S101). Judged is whether a battery enters an idle time when a drop voltage is generated according to a capacitor characteristic after completion of charge and discharge operations(S102). If the battery enters the idle time, a drop-generated point of a charge/discharge voltage according to a capacitor characteristic is detected(S103). After measuring a variation of a drop voltage according to a time constant(S104), a point where a voltage variation is approximate to 0V is extracted(S105). An intermediate point of a distance between extracted discharge/charge voltages is extracted by a no-load voltage(S106), and the extracted value is used as an SOC reference value(S107).
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