Method and device for monitoring deterioration of battery
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Abstract
A battery characteristic detecting method according to the invention includes a first step in which constant current discharge from a battery is performed at a predetermined current value, and a voltage during constant current discharge is measured; a second step in which overpotential for mass transfer control in the battery or resistance for the mass transfer control in the battery is calculated based on the voltage measured in the first step; and a third step in which a determination that a characteristic change has occurred in the battery is made, when the overpotential for the mass transfer control in the battery or the resistance for the mass transfer control in the battery calculated in the second step is larger than a predetermined threshold value.
44 Citations
27 Claims
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1-8. -8. (canceled)
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9. A battery characteristic detecting method, comprising:
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(i) performing constant current discharge from a battery at a predetermined current value, and measuring a voltage in the battery during the constant current discharge;
(ii) calculating overpotential for mass transfer control in the battery or resistance for the mass transfer control in the battery based on the measured voltage; and
(iii) determining that a characteristic change has occurred in the battery, when the calculated overpotential for the mass transfer control in the battery or resistance for the mass transfer control in the battery is larger than a predetermined threshold value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26)
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27. A battery characteristic detecting device, comprising:
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a measuring portion which discharges a battery at a predetermined constant current value and which measures a voltage during the constant current discharge;
a calculating portion which calculates overpotential for mass transfer control in the battery or resistance for the mass transfer control in the battery based on the measured voltage; and
a determining portion which determines that a characteristic change has occurred in the battery when the calculated overpotential for the mass transfer control or resistance for the mass transfer control is larger than a predetermined threshold value.
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Specification