SECONDARY CELL CHARGER AND CHARGING METHOD

摘要

A secondary cell charger and a secondary cell charging method for preventing undercharging or supercharging of a secondary cell and enabling reliable quick charging. After a predetermined charging applied voltage value Es above a full-charge balanced voltage value Eeq is applied to a secondary cell (1) for a predetermined time, the applied voltage is changed to the full-charge balanced voltage value Eeq. The value i of the current flowing at this time is measured and compared with a predetermined charging end reference current value J. If the current value i is greater than the predetermined charging end reference current value J, the predetermined charging applied voltage value Es is applied to the secondary cell (1) again, and the flow is repeated. Whereas, if the current value i is less than the predetermined charging end reference current value J, the charging of the secondary cell (1) is stopped.