Battery capacity calculating method, battery capacity calculating apparatus and battery capacity calculating program
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Accused Products
Abstract
A battery calculating method, apparatus, and program are provided. The battery capacity calculating method and apparatus can very accurately calculate a residual capacity of a secondary battery especially in the last stage of discharging independently of environmental conditions such as a temperature or a deteriorated state. the battery capacity calculating apparatus is equipped with a voltage measuring circuit which measures the terminal voltage (Vmea) of a battery at the time of discharging, a current measuring circuit which measures the current value (I) of the battery at the time of discharging, and a control circuit which calculates a residual capacity and/or residual power. The operation unit in the control circuit calculates a discharged capacity (Qmea) and an apparent discharged capacity (Qocv) based on a terminal voltage (Vmea) and a current value (I) measured by the voltage measuring circuit and the current measuring circuit, respectively, estimates a discharge curve (Cpre) in the future including the last stage of discharging based on a capacity shift (ΔQ) being the difference between the discharged capacity (Qmea) and the apparent discharged capacity (Qocv) during discharging, and calculates the residual capacity and/or the residual power of the battery based on the estimated discharge curve (Cpre).
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Citations
62 Claims
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1-31. -31. (canceled)
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32. A battery capacity calculating method for calculating a residual capacity and/or residual power of a secondary battery, comprising:
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calculating an equilibrium voltage curve Cequ showing a relation between a discharged capacity and an equilibrium voltage in said secondary battery;
measuring a terminal voltage Vmea and a current value I of said secondary battery at a time of discharging;
calculating a discharged capacity Qmea of said secondary battery based on the terminal voltage Vmea and the current value I;
calculating an apparent equilibrium voltage Vocv by adding a voltage drop Δ
Vdc by a direct current resistance Rdc to the terminal voltage Vmea;
calculating an apparent discharged capacity Qocv corresponding to the apparent equilibrium voltage Vocv calculated based on the equilibrium voltage curve Qequ;
calculating a capacity shift Δ
Q being a difference between the discharged capacity Qmea and the apparent discharged capacity Qocv; and
estimating a discharge curve Cpre in a future based on the capacity shift Δ
Q calculated at said capacity shift calculating step. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A battery capacity calculating apparatus for calculating a residual capacity and/or residual power of a secondary battery, comprising:
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voltage measuring means for measuring a terminal voltage Vmea of said secondary battery at a time of discharging;
current measuring means for measuring a current value I of said secondary battery at the time of discharging; and
operation processing means for calculating the residual capacity and/or the residual power of said secondary battery, wherein said operation processing means calculates an equilibrium voltage curve Cequ showing a relation between a discharged capacity and an equilibrium voltage in said secondary battery, calculates a discharged capacity Qmea of said secondary battery based on the terminal voltage Vmea measured with said voltage measuring means and the current value I measured with said current measuring means, calculates an apparent equilibrium voltage Vocv by adding a voltage drop Δ
Vdc by a direct current resistance Rdc to the terminal voltage Vmea, calculates an apparent discharged capacity Qocv corresponding to the apparent equilibrium voltage VOcv based on the equilibrium voltage curve Qequ, calculates a capacity shift Δ
Q being a difference between the discharged capacity Qmea and the apparent discharged capacity Qocv, and estimates a discharge curve Cpre in a future based on the capacity shift Δ
Q. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. A battery capacity calculating program capable of being executed by a computer for calculating a residual capacity and/or residual power of a secondary battery, comprising:
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equilibrium voltage curve calculating processing for calculating an equilibrium voltage curve Cequ showing a relation between a discharged capacity and an equilibrium voltage of said secondary battery;
voltage current measuring processing for measuring a terminal voltage Vmea and a current value I of said secondary battery at a time of discharging;
discharged capacity calculating processing for calculating a discharged capacity Qmea of said secondary battery based on the terminal voltage Vmea and the current value I, both measured by said voltage current measuring processing;
apparent equilibrium voltage calculating processing for calculating an apparent equilibrium voltage Vocd by adding a voltage drop Δ
Vdc by a direct current resistance Rdc to the terminal voltage Vmea;
apparent discharged capacity calculating processing for calculating an apparent discharged capacity Qocv corresponding to the apparent equilibrium voltage Vocv calculated by said equilibrium voltage calculating processing based on said equilibrium voltage curve Cequ calculated by said equilibrium voltage curve calculating processing;
capacity shift calculating processing for calculating a capacity shift Δ
Q being a difference between the discharged capacity Qmea and the apparent discharged capacity Qocv; and
estimating processing for estimating a discharge curve Cpre in a future based on the capacity shift Δ
Q calculated by said capacity shift calculating processing.
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Specification