Storage battery evaluating apparatus and method

1. A storage battery evaluating apparatus, comprising:

a determiner configured to determine a charging/discharging tendency of a storage battery based on measurement data including voltage data of the storage battery;

a corrector configured to correct the voltage data based on a correction parameter, the correction parameter corresponding to at least one of the charging/discharging tendency and a degraded state of the storage battery;

a QV curve generator configured to generate a QV curve of the storage battery based on the voltage data which has been corrected;

an evaluator configured to evaluate the degraded state based on the QV curve; and

a feedbacker configured to feed back, to the corrector, the correction parameter corresponding to the degraded state.

2. The apparatus according to claim 1 , wherein the corrector calculates, based on the correction parameter, a voltage component caused by an internal resistance of the storage battery, and removes the voltage component from the voltage data.

3. The apparatus according to claim 1 , wherein the corrector calculates, based on a relaxation parameter of the storage battery, the relaxation parameter corresponding to the charging/discharging tendency and the degraded state, a voltage component caused by a non-ohmic resistance of the storage battery.

4. The apparatus according to claim 1 , wherein the corrector calculates, based on an ohmic resistance of the storage battery, the ohmic resistance corresponding to the degraded state, a voltage component caused by the ohmic resistance.

5. The apparatus according to claim 1 , wherein the determiner determines the charging/discharging tendency based on a variation of a charged amount of the storage battery during a predetermined period.

6. The apparatus according to claim 1 , further comprising:

a degradation characteristic database configured to store the correction parameter obtained by a degradation test.

7. The apparatus according to claim 1 , further comprising:

a dQdV curve generator configured to generate a dQdV curve of the storage battery from the QV curve.

8. The apparatus according to claim 1 , wherein the evaluator calculates, from at least one of the QV curve and a dQdV curve, a characteristic quantity correlated with the degraded state of the storage battery, and evaluates the degraded state based on the characteristic quantity.

9. The apparatus according to claim 1 , further comprising:

an estimator configured to estimate a remaining life of the storage battery based on the degraded state.

10. A storage battery evaluating method performed by a computer system including a processor and a hardware storage, comprising:

determining by the processor a charging/discharging tendency of a storage battery based on measurement data including voltage data in the hardware storage;

correcting by the processor the voltage data based on a correction parameter corresponding to at least one of the charging/discharging tendency and a degraded state of the storage battery;

generating by the processor a QV curve of the storage battery based on the voltage data which has been corrected; and

evaluating by the processor the degraded state based on the QV curve;

wherein the correcting the voltage data includes correcting the voltage data based on the correction parameter corresponding to the degraded state.