| 摘要 |
The invention provides a method of precisely estimating the effective full-discharge capacity of a secondary battery. That effective full-discharge capacity degrades as the secondary battery is repeatedly charged and discharged. The method includes sequentially fully charging a reference secondary battery and fully discharging the reference secondary battery until the reference secondary battery is dead, n times, and simultaneously measuring (i) a constant-voltage period in which the voltage of the reference secondary battery is essentially constant each time the reference secondary battery is fully charged and (ii) full discharge capacity of the reference secondary battery each time the reference secondary battery is fully charged, and storing the constant-voltage periods and corresponding full-discharge capacities measured; and measuring the constant-voltage period each time a secondary battery, essentially identical to the reference secondary battery, is charged, searching the constant-voltage periods stored for the reference secondary battery for the full-discharge capacity corresponding to the constant-voltage period measured for the secondary battery, and setting, for the secondary battery, as an effective full-discharge capacity, the full-discharge capacity of the reference secondary battery stored and corresponding to the constant-voltage period of the secondary battery that has been measured.
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