Method and apparatus for controlling residual battery capacity of secondary battery
First Claim
1. A method for controlling a residual battery capacity of a secondary battery, comprising:
- detecting a current flowing through the secondary battery to perform an operation on a residual battery capacity by multiplying the detected current by a predetermined charge efficiency;
detecting an output voltage from the secondary battery to calculate an average voltage value of output voltages detected for a predetermined period of time;
calculating an average value of residual battery capacities obtained by the operation for the predetermined period of time;
referring to a reference voltage value of the secondary battery corresponding to the calculated average value of residual battery capacities;
comparing the reference voltage value and the average voltage value; and
setting the predetermined charge efficiency variably, based on a result of the comparison.
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Abstract
A method for controlling a residual battery capacity of a secondary battery, by which the precision of the energy management of the system can be improved substantially, is provided. A current flowing through the battery is detected and the detected current is multiplied by a predetermined charge efficiency so that an operation on a residual battery capacity is performed at least by current integration (S201), an output voltage from the battery is detected and an average of the output voltages detected for a predetermined time period is calculated (S202), an average of the residual battery capacities obtained by the operation for a predetermined time period is calculated (S203), a reference voltage corresponding to the calculated average of residual battery capacities is referred to (S204), the reference voltage and the average voltage is compared (S205), and the predetermined charge efficiency is set variably based on a result of the comparison (S206).
76 Citations
21 Claims
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1. A method for controlling a residual battery capacity of a secondary battery, comprising:
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detecting a current flowing through the secondary battery to perform an operation on a residual battery capacity by multiplying the detected current by a predetermined charge efficiency;
detecting an output voltage from the secondary battery to calculate an average voltage value of output voltages detected for a predetermined period of time;
calculating an average value of residual battery capacities obtained by the operation for the predetermined period of time;
referring to a reference voltage value of the secondary battery corresponding to the calculated average value of residual battery capacities;
comparing the reference voltage value and the average voltage value; and
setting the predetermined charge efficiency variably, based on a result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A residual battery capacity control apparatus for a secondary battery, comprising:
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a current detection unit that detects a current flowing through the secondary battery;
a residual battery capacity operation unit that performs an operation on a residual battery capacity by multiplying a current signal from the current detection unit by a predetermined charge efficiency;
a voltage detection unit that detects an output voltage from the secondary battery;
an average voltage calculation unit that calculates an average voltage value of voltage signals output from the voltage detection unit for a predetermined period of time;
an average residual battery capacity calculation unit that calculates an average value of residual battery capacities obtained by the operation by the residual battery capacity operation unit for a predetermined period of time;
a reference voltage storage unit that stores a reference voltage value of the secondary battery, corresponding to the average value of residual battery capacities obtained from the average residual battery capacity calculation unit;
a comparison unit that compares the average voltage value obtained from the average voltage calculation unit and the reference voltage value obtained from the reference voltage storage unit; and
a charge efficiency setting unit that sets the predetermined charge efficiency variably with respect to the residual battery capacity operation unit, based on a result of the comparison by the comparison unit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21)
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15. A residual battery capacity control apparatus for a secondary battery, comprising:
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a battery pack composed of a combination of a plurality of electric cells, each of which is a secondary battery, and used in a middle charged state, a current detection unit that detects a current flowing through the battery pack;
a residual battery capacity operation unit that performs an operation on a residual battery capacity by multiplying a current signal from the current detection unit by a predetermined charge efficiency;
a voltage detection unit that detects an output voltage from the battery pack;
an average voltage calculation unit that calculates an average voltage value of voltage signals output from the voltage detection unit for a predetermined period of time;
an average residual battery capacity calculation unit that calculates an average value of residual battery capacities obtained by the operation by the residual battery capacity operation unit for a predetermined period of time;
a reference voltage storage unit that stores a reference voltage value of each secondary battery, corresponding to the average value of residual battery capacities obtained from the average residual battery capacity calculation unit;
a comparison unit that compares the average voltage value obtained from the average voltage calculation unit and the reference voltage value obtained from the reference voltage storage unit; and
a charge efficiency setting unit that sets the predetermined charge efficiency variably with respect to the residual battery capacity operation unit, based on a result of the comparison by the comparison unit.
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Specification