Method and device for estimating battery's dischargeable capacity
First Claim
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1. A method for estimating residual discharge capacity of a battery for allowing a maximum current to be supplied continuously to a load, said method comprising the steps of:
- estimating a terminal voltage drop of the battery when a maximum current at high rate discharge is continuously supplied to the load; and
estimating the residual discharge capacity by subtracting undischargeable charge calculated based on the estimated terminal voltage drop of the battery from dischargeable charge in the battery in any state of charge.
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Abstract
A unit for estimating voltage drop 23a-1 estimates voltage drop of a battery terminal when maximum current is continuously supplied at high rate discharge. A unit for estimating residual discharge capacity 23a-2 estimates residual discharge capacity of the battery for allowing the maximum current to be continuously supplied to a load by subtracting the undischargeable electric charge calculated from the voltage drop estimated by the unit for estimating voltage drop 23a-1 from the dischargeable charge in any state of charge.
18 Citations
15 Claims
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1. A method for estimating residual discharge capacity of a battery for allowing a maximum current to be supplied continuously to a load, said method comprising the steps of:
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estimating a terminal voltage drop of the battery when a maximum current at high rate discharge is continuously supplied to the load; and
estimating the residual discharge capacity by subtracting undischargeable charge calculated based on the estimated terminal voltage drop of the battery from dischargeable charge in the battery in any state of charge. - View Dependent Claims (4, 5, 7)
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2. A method for estimating residual discharge capacity of a battery for allowing a maximum current to be supplied continuously to a load, said method comprising the steps of:
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estimating a maximum terminal voltage drop of the battery when a maximum current at high rate discharge is continuously supplied to the load;
calculating a rate of the estimated maximum terminal voltage drop of the battery to a maximum allowable voltage drop of the battery corresponding to the maximum current, estimating the residual discharge capacity by subtracting undischargeable charge calculated based on the rate from dischargeable charge in the battery in any state of charge. - View Dependent Claims (3, 12, 13, 14)
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6. A method for estimating residual discharge capacity of a battery for allowing a maximum current to be supplied continuously to a load, said method comprising the steps of:
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estimating a maximum terminal voltage drop of the battery when a maximum current at high rate discharge is continuously supplied to the load; and
estimating the residual discharge capacity by subtracting undischargeable charge calculated based on the estimated maximum terminal voltage drop of the battery from dischargeable charge in the battery in any state of charge. - View Dependent Claims (15)
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8. An apparatus for estimating residual discharge capacity of a battery for allowing a maximum current to be supplied continuously to a load, said apparatus comprising:
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a device for estimating a terminal voltage drop of the battery when a maximum current at high rate discharge is continuously supplied to the load; and
a device for estimating the residual discharge capacity by subtracting undischargeable charge calculated based on the estimated terminal voltage drop of the battery from dischargeable charge in the battery in any state of charge. - View Dependent Claims (9, 10, 11)
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Specification