Secondary battery charge status estimation device and secondary battery charge status estimation method
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United States of America Patent
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Feb 20, 2018
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N/A
app pub date -
Jan 31, 2014
filing date -
Mar 28, 2013
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Abstract
Charge state estimation device includes: current/voltage acquiring unit for acquiring a charge/discharge current value and inter-terminal voltage value of secondary battery; combined current calculating unit for calculating a combined current value from the charge/discharge current value acquired at a time t; estimation time setting unit for setting, as an estimation time for charge state estimation, the time at which the combined current value exists within a predetermined threshold range; internal resistance estimating unit for estimating the internal resistance value of secondary battery on the basis of the inter-terminal voltage values and charge/discharge current values of secondary battery at the estimation time T and at sampling time before the estimation time; and charge state estimating unit for estimating the open circuit voltage value and charge state value of the secondary battery on the basis of the inter-terminal voltage value of secondary battery at the estimation time and the internal resistance value.
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