METHOD FOR REFRESH CHARGING OF ASSEMBLED BATTERY COMPRISING LEAD BATTERY, AND CHARGING DEVICE

摘要

Provided are a refresh charging method and a refresh charging apparatus for an assembled battery constituted from lead-acid storage batteries, by which a necessary charging rate may be performed while shortening a charging period. In a constant voltage charging mode, n intermediate threshold values S 1 to S n which decrease stepwisely are set between a predetermined threshold value S 0 and a lower-limit current value, and n additional timer periods T 1 to T n are set where n is an integer equal to or larger than one. Counting of the n additional timer periods T 1 to T n is respectively started when the charging current reaches the n intermediate threshold values S 1 to S n . A maximum timer period T m and the n additional timer periods T 1 to T n are set to satisfy a relationship of T m > T 1 > ... >T n . Charging is stopped when the counting of one of the maximum timer period T m and the n additional timer periods T 1 to T n is completed before the lower-limit current value is detected.