Patent ID: 7382110
Filing Date: 2008-06-03
Classification: G01R,H02J

Abstract:
1. A method of charging a secondary battery, comprising: performing a detection of a charging rate of the secondary battery using an integrating method in which a battery capacity is calculated by integrating a current value or a power value of the secondary battery for a certain period of time, and a detection of the charging rate of the secondary battery using a voltage method in which an open-circuit voltage value of the secondary battery is measured and the charging rate is calculated based on a correlation between the open-circuit voltage value and the charging rate; and performing a weighted addition of the charging rate detected by the integrating method and the charging rate detected by the voltage method in accordance with the charging rate of the secondary battery, whereby detecting a final charging rate using the weighted addition when the charging rate by the voltage method is at least 90 percent further comprising detecting a final charging rate using the integrating method when the charging rate by the voltage method is less than 90 percent.