BATTERY CONTROL DEVICE AND BATTERY CONTROL METHOD
First Claim
1. A battery control device for controlling a secondary battery, comprising:
- a current measuring part for measuring charge/discharge current value of the secondary battery;
a discharge capacity calculator for integrating the charge/discharge current value measured by said current measuring part so as to calculate calculated value of a discharge capacity in the secondary battery, and correcting the calculated value of the discharge capacity in the secondary battery charged/discharged to a depth of discharge at which the calculated value of the discharge capacity is corrected;
an estimated error calculator for calculating an estimated error of the calculated value of the discharge capacity calculated by said discharge capacity calculator;
a first comparator for setting the secondary battery where the estimated error calculated by said estimated error calculator exceeds a first threshold as a candidate for correction of the calculated value of the discharge capacity,a first threshold holding part for holding the first threshold;
a bidirectional converter for controlling charge/discharge of the secondary battery; and
a charge/discharge command part for causing said bidirectional converter to charge/discharge all or some of the secondary battery as the candidate for the correction of the calculated value of the discharge capacity to the depth of discharge at which the correction is made.
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Accused Products
Abstract
A power storage device has a NaS battery for storing electric power, a Hall current detector for measuring charge/discharge current value I of the NaS battery, a bidirectional converter for converting electric power between a direct current and an alternating current bidirectionally, and a controller for controlling the power storage device. The controller integrates the charge/discharge current value I of the NaS battery and calculates the calculated value of the discharge capacity in the NaS battery. The controller calculates estimated error Er(t2) of the calculated value of the discharge capacity, specifies NaS battery 1004 that requires the correction of the calculated value of the discharge capacity, charges/discharges the NaS battery to a depth of discharge at which the calculated value of the discharge capacity is corrected, and corrects the calculated value of the discharge capacity in the charged/discharged NaS battery.
39 Citations
18 Claims
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1. A battery control device for controlling a secondary battery, comprising:
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a current measuring part for measuring charge/discharge current value of the secondary battery; a discharge capacity calculator for integrating the charge/discharge current value measured by said current measuring part so as to calculate calculated value of a discharge capacity in the secondary battery, and correcting the calculated value of the discharge capacity in the secondary battery charged/discharged to a depth of discharge at which the calculated value of the discharge capacity is corrected; an estimated error calculator for calculating an estimated error of the calculated value of the discharge capacity calculated by said discharge capacity calculator; a first comparator for setting the secondary battery where the estimated error calculated by said estimated error calculator exceeds a first threshold as a candidate for correction of the calculated value of the discharge capacity, a first threshold holding part for holding the first threshold; a bidirectional converter for controlling charge/discharge of the secondary battery; and a charge/discharge command part for causing said bidirectional converter to charge/discharge all or some of the secondary battery as the candidate for the correction of the calculated value of the discharge capacity to the depth of discharge at which the correction is made. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for controlling a secondary battery, comprising steps of:
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a) measuring charge/discharge current value of the secondary battery; b) integrating the charge/discharge current value measured by said step a) and calculating calculated value of a discharge capacity in the secondary battery; c) calculating an estimated error of the calculated value of the discharge capacity calculated by said step b); d) setting the secondary battery where the estimated error calculated by said step c) exceeds a threshold as a candidate for correction of the calculated value of the discharge capacity; e) charging/discharging all or some of the secondary battery as the candidate for the correction of the discharge capacity to a depth of discharge at which the correction is made; and f) correcting the calculated values of the discharge capacity in the secondary battery charged/discharged to the depth of discharge at which the calculated value of the discharge capacity is corrected.
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Specification