BATTERY STATE MEASURING METHOD AND APPARATUS, AND ELECTRONIC APPARATUS
First Claim
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1. A battery state measuring method comprising:
- detecting a battery voltage of a rechargeable battery;
computing a battery voltage at a time when charging or discharge of the rechargeable battery stops, corresponding to a charging rate of the rechargeable battery of a unit time before, based on a first battery characteristic that determines a relationship between the charging rate and the battery voltage at the time when the charging or discharge of the rechargeable battery stops;
computing a voltage difference between the battery voltage detected by the detecting and the battery voltage computed by the battery voltage computing;
computing a variation per unit time of the charging rate of the rechargeable battery, corresponding to the voltage difference computed by the voltage difference computing, based on a second battery characteristic that determines a relationship of a voltage difference between the battery voltage at the time when the charging or discharge of the rechargeable battery stops and the battery voltage detected by the detecting, and a variation per unit time of the charging rate of the rechargeable battery; and
computing a charging rate of the rechargeable battery of the unit time after, using the charging rate of the rechargeable battery of the unit time before and the variation computed by the variation computing.
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Abstract
A battery state measuring method computes a battery voltage at a time when charging or discharge of a battery stops, corresponding to a charging rate of a unit time before, based on a first battery characteristic. The method further computes a variation per unit time of the charging rate, corresponding to a voltage difference between the detected and computed battery voltages, based on a second battery characteristic, and computes a charging rate of the unit time after, using the charging rate of the unit time before and the computed variation.
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Citations
19 Claims
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1. A battery state measuring method comprising:
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detecting a battery voltage of a rechargeable battery; computing a battery voltage at a time when charging or discharge of the rechargeable battery stops, corresponding to a charging rate of the rechargeable battery of a unit time before, based on a first battery characteristic that determines a relationship between the charging rate and the battery voltage at the time when the charging or discharge of the rechargeable battery stops; computing a voltage difference between the battery voltage detected by the detecting and the battery voltage computed by the battery voltage computing; computing a variation per unit time of the charging rate of the rechargeable battery, corresponding to the voltage difference computed by the voltage difference computing, based on a second battery characteristic that determines a relationship of a voltage difference between the battery voltage at the time when the charging or discharge of the rechargeable battery stops and the battery voltage detected by the detecting, and a variation per unit time of the charging rate of the rechargeable battery; and computing a charging rate of the rechargeable battery of the unit time after, using the charging rate of the rechargeable battery of the unit time before and the variation computed by the variation computing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A battery state measuring apparatus comprising:
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a voltage detector configured to detect a battery voltage of a rechargeable battery; a voltage computing unit configured to compute a battery voltage at a time when charging or discharge of the rechargeable battery stops, corresponding to a charging rate of the rechargeable battery of a unit time before, based on a first battery characteristic that determines a relationship between the charging rate and the battery voltage at the time when the charging or discharge of the rechargeable battery stops; a voltage difference computing unit configured to compute a voltage difference between the battery voltage detected by the voltage detector and the battery voltage computed by the voltage computing unit; a variation computing unit configured to compute a variation per unit time of the charging rate of the rechargeable battery, corresponding to the voltage difference computed by the voltage difference computing unit, based on a second battery characteristic that determines a relationship of a voltage difference between the battery voltage at the time when the charging or discharge of the rechargeable battery stops and the battery voltage detected by the voltage detector, and a variation per unit time of the charging rate of the rechargeable battery; and a charging rate computing unit configured to compute a charging rate of the rechargeable battery of the unit time after, using the charging rate of the rechargeable battery of the unit time before and the variation computed by the variation computing unit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification