| 摘要 |
A battery capacity meter and a method for precisely calculating a battery capacity are obtained by measuring a terminal voltage of the battery and sequentially calculating the measured terminal voltages. In a battery capacity meter of the present invention, a calculation process is carried out. After a power source is connected to the battery capacity meter, an initial value S0 under non-consistent charge state Si is calculated from an initial value V0 of a terminal voltage Vi. Next, Vi and Si are related to a current Ii, and an equation for relating a variation amount DELTA Si of Si to Si is formed. Under this relationship, DELTA Si is obtained from Vi and Si in a time interval DELTA t. A value of Si is updated. Either a remaining capacity or a fuel-gauge normalized remaining capacity are obtained from the updated value of Si. A process operation is returned to a step where DELTA Si is calculated, and this process is repeated.
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