Method of Evaluating Remaining Power of a Battery for Portable
First Claim
1. A method comprising:
- measuring a momentary voltage of a battery having one or more specific parameters;
measuring a momentary current of the battery;
providing a corrected voltage based on the measured momentary voltage and the momentary current and the one or more specific parameters; and
providing an amount of available energy E in the battery based on a function f1 of the corrected voltage and the one or more specific parameters.
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Accused Products
Abstract
A remaining energy E of a battery is estimated based on a measurement of a momentary voltage and a momentary current. E is defined as a function of its voltage U or power owing to a characteristic function (E/U) or (E/P). Instead of the function, a lookup table can be used. E/U function is defined by using a reference battery having the same or similar characteristics. A set of low and high current or power loads are applied to the reference battery to cause voltage drops which are measured and then used to determine function (E/U) and a parameter Alpha which is specific to the type of reference battery. During the operation of the battery, momentary voltage and current are measured and Alpha is used to correct the momentary voltage. Afterwards, function (E/U) enables to estimate E. The battery size is used to scale E for a better estimation.
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Citations
20 Claims
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1. A method comprising:
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measuring a momentary voltage of a battery having one or more specific parameters; measuring a momentary current of the battery; providing a corrected voltage based on the measured momentary voltage and the momentary current and the one or more specific parameters; and providing an amount of available energy E in the battery based on a function f1 of the corrected voltage and the one or more specific parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus comprising:
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an energy management circuitry of at least one battery having one or more specific parameters configured; to measure a momentary voltage and a momentary current of each of the at least one battery; to provide a corrected voltage U of each of the at least one battery based on the measured momentary voltage, the momentary current and the one or more specific parameters; and to provide an amount of available energy E in at least one of the at least one battery, each amount of available energy E being based on a function f1 of the corresponding corrected voltage U and the one or more specific parameters. - View Dependent Claims (14, 15, 16, 17)
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18. A method comprising:
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applying a set of low and constant power consumptions to a battery; measuring a first set of voltage drops of the battery respectively resulting from the set of low and constant power consumptions; applying a set of high power consumption to the battery; measuring a second set of voltage drops of the battery respectively resulting from the set of high power consumptions; and determining a parameter alpha specific to the battery by correlating the power consumption applied to the battery with the resulting voltage drops. - View Dependent Claims (19)
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20. A computer-readable medium encoded with instruction that, when executed by a computer, perform:
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measuring a momentary voltage of a battery having one or more specific parameters; measuring a momentary current of the battery; providing a corrected voltage based on the measured momentary voltage and the momentary current and the one or more specific parameters; and providing an amount of available energy E in the battery based on a function f1 of the corrected voltage and the one or more specific parameters.
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Specification