SECONDARY BATTERY STATE-OF-CHARGE ESTIMATING DEVICE AND SECONDARY BATTERY STATE-OF-CHARGE ESTIMATING METHOD
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Feb 3, 2016
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Feb 13, 2015
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Abstract
A state-of-charge (SOC) estimating device includes detector, a current-integration SOC calculator, a state estimation SOC calculator, a convergence determiner, and SOC selector. The detector detects a charge/discharge current and a voltage between terminals of a secondary battery. The current-integration SOC calculator calculates a state-of-charge value of the secondary battery by a current integration method. The state estimation SOC calculator calculates a state-of-charge value of the secondary battery by a state estimation method. The convergence determiner determines the convergence of the state estimation by the state estimation SOC calculator. The SOC selector selects a state-of-charge of the secondary battery from the calculated state-of-charge values according to the determination result of the convergence determiner. The convergence determiner determines non-convergence when the secondary battery is charging and at the same time the change of a given charging parameter has been determined smaller than a given threshold.
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