| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring a battery charging state which can accurately measure the charging state of the battery, by making bringing about large accumulated errors difficult, by continuously accumulating charging and discharging currents for a long period. SOLUTION: The method for measuring the battery charging state includes the steps of adding and subtracting present charging state of the battery of charging current and discharging current periodically measured by a current measuring means 15 by means of an accumulation type charging state measuring means 23a-1, and measuring the charging state of the battery. The method further includes the steps of estimating an open circuit voltage by an open circuit voltage estimating means 23a-3, based on a transition of a terminal voltage measured by a voltage-measuring means 23a-2 after the charging or discharging is substantially finished, and calculating to obtain the charging state of the battery by an arithmetic meas 23a-4, based on the estimated open circuit voltage. The method also includes the steps of updating the present charging state by a charging state updating means 23a-5 by using the charging state obtained by the means 23a-4, and setting the present charging state. COPYRIGHT: (C)2004,JPO |
