Management of battery charging through coulomb counting
First Claim
1. A battery state of charge management method comprising the steps of:
- estimating a battery state of charge;
determining charge delivered to or from a battery based on Coulomb counting and updating said estimated battery state of charge based on the amount of delivered charge;
measuring the battery current and comparing the updated estimated battery state of charge with a selected recalibration point state of charge having a value of less than 100%, the selected recalibration point state of charge having a value being associated with an expected battery current for that selected recalibration point state of charge value; and
modifying the updated estimated battery state of charge when the updated estimated state of charge is greater than the selected recalibration point state of charge value and the measured battery current is greater than the expected battery current associated with the selected recalibration point state of charge.
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Abstract
A battery charge management method and device operable to perform that method. The battery charge management method comprises the steps of determining charge delivered to or from a battery based on Coulomb counting and updating an estimated battery state of charge based on the amount of delivered charge and measuring the battery current. Then comparing the updated estimated battery state of charge with a predetermined state of charge value of less than 100%, such that each predetermined state of charge value being associated with an expected battery current for that predetermined state of charge value. The method also includes modifying the updated estimated battery state of charge when the updated estimated state of charge is greater than the predetermined state of charge value and the measured battery current is greater than the expected battery current associated with the predetermined state of charge.
22 Citations
15 Claims
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1. A battery state of charge management method comprising the steps of:
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estimating a battery state of charge; determining charge delivered to or from a battery based on Coulomb counting and updating said estimated battery state of charge based on the amount of delivered charge; measuring the battery current and comparing the updated estimated battery state of charge with a selected recalibration point state of charge having a value of less than 100%, the selected recalibration point state of charge having a value being associated with an expected battery current for that selected recalibration point state of charge value; and modifying the updated estimated battery state of charge when the updated estimated state of charge is greater than the selected recalibration point state of charge value and the measured battery current is greater than the expected battery current associated with the selected recalibration point state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A battery state of charge management device comprising:
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means for measuring the battery current; a Coulomb counter for determining charge delivered to or from a battery based on Coulomb counting and for updating an estimated battery state of charge based on the amount of delivered charge; memory means in which is stored a selected recalibration point state of charge value of less than 100% and an expected battery current for that selected recalibration point state of charge; and an analyzer for comparing the updated estimated battery state of charge with the selected recalibration point state of charge value and for modifying the updated estimated battery state of charge when the updated estimated state of charge is greater than the selected recalibration point state of charge value and the measured battery current is greater than the expected battery current associated with the selected recalibration point state of charge.
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Specification