Method and apparatus for computing remaining battery capacity utilizing battery discharge capacity
First Claim
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1. A method of computing a remaining battery capacity, said method comprising:
- obtaining one of a full-charge capacity and a charge capacity;
measuring an internal battery resistance;
computing a battery discharge capacity by adding an integrated value of power consumed by the internal battery resistance to a computed discharge capacity value calculated from an integrated product of discharge current and voltage; and
computing the remaining battery capacity by subtracting the battery discharge capacity from the one of the full-charge capacity and the charge capacity.
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Abstract
Remaining battery capacity is computed by computing battery discharge capacity from an integrated value of a product of discharge current and voltage to find remaining battery capacity via energy (integrated power). Battery discharge capacity is computed by adding the integrated value of power consumed by internal resistance to a discharge capacity value calculated from the integrated product of discharge current and voltage, and the remaining battery capacity is computed from this battery discharge capacity.
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13 Claims
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1. A method of computing a remaining battery capacity, said method comprising:
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obtaining one of a full-charge capacity and a charge capacity;
measuring an internal battery resistance;
computing a battery discharge capacity by adding an integrated value of power consumed by the internal battery resistance to a computed discharge capacity value calculated from an integrated product of discharge current and voltage; and
computing the remaining battery capacity by subtracting the battery discharge capacity from the one of the full-charge capacity and the charge capacity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery pack comprising:
a computation circuit operable to obtain one of a full-charge capacity and a charge capacity, measure an internal battery resistance, compute a battery discharge capacity by adding an integrated value of power consumed by the internal battery resistance to a computed discharge capacity value calculated from an integrated product of discharge current and voltage, and compute a remaining battery capacity by subtracting the battery discharge capacity from the one of the full-charge capacity and the charge capacity. - View Dependent Claims (9, 10, 11, 12, 13)
Specification