Method of estimating residual capacity of battery
First Claim
1. A method of estimating the residual capacity of a battery, comprising the steps of:
- measuring a present discharging current and an output voltage of the battery when the battery is being discharged;
establishing a reference point approximating an intersection of a plurality of current/voltage characteristics linear curves representing the relationship between discharging current and output voltage during discharge of the battery;
determining a present current/voltage characteristic linear curve of the battery passing through said reference point and an operating point of the battery which corresponds to said measured present discharging current and the output voltage values; and
estimating a present residual capacity of the battery based on a location of said measured present discharging current and output voltage values on said present current/voltage characteristic linear curve.
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Abstract
In estimating the residual capacity of a battery according to the maximum output estimating process, a reference point is established in advance at the intersection of a plurality of current/voltage characteristic linear curves corresponding to various residual capacities of the battery or in an area in the vicinity of the intersections of the curves. A current/voltage characteristic linear curve is determined so as to pass through the reference point and a measured operating point of the battery which corresponds to the present discharging current and output voltage values measured when the battery is discharged. Then, a maximum transfer power value of the battery is determined from the current/voltage characteristic linear curve thus determined, and the present residual capacity of the battery is estimated from the maximum transfer power value.
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Citations
19 Claims
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1. A method of estimating the residual capacity of a battery, comprising the steps of:
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measuring a present discharging current and an output voltage of the battery when the battery is being discharged; establishing a reference point approximating an intersection of a plurality of current/voltage characteristics linear curves representing the relationship between discharging current and output voltage during discharge of the battery; determining a present current/voltage characteristic linear curve of the battery passing through said reference point and an operating point of the battery which corresponds to said measured present discharging current and the output voltage values; and estimating a present residual capacity of the battery based on a location of said measured present discharging current and output voltage values on said present current/voltage characteristic linear curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of estimating the residual capacity of a battery by the maximum transfer power estimating process using a current/voltage characteristic linear curve, comprising the steps of:
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measuring a present discharging current and an output voltage of the battery when the battery is being discharged; establishing a reference point approximating an intersection of a plurality of current/voltage characteristic linear curves corresponding to respective residual capacities of the battery; and developing a present current/voltage characteristic linear curve passing through said reference point and a measured operating point of the battery which corresponds to the measured present discharging current and output voltage of the battery for use in the maximum transfer power estimating process. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification