MANAGEMENT OF BATTERY CHARGING THROUGH COULOMB COUNTING
First Claim
1. A battery charge management method comprising 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;
measuring the battery current;
comparing the updated estimated battery state of charge with a predetermined state of charge value of less than 100%, each predetermined state of charge value being associated with an expected battery current for that predetermined state of charge value; and
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.
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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.
34 Citations
15 Claims
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1. A battery charge management method comprising the steps of:
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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; measuring the battery current;
comparing the updated estimated battery state of charge with a predetermined state of charge value of less than 100%, each predetermined state of charge value being associated with an expected battery current for that predetermined state of charge value; andmodifying 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A battery 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 predetermined state of charge value of less than 100% and an expected battery current for that predetermined state of charge; and an analyser for comparing the updated estimated battery state of charge with the predetermined 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 predetermined state of charge value and the measured battery current is greater than the expected battery current associated with the predetermined state of charge.
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Specification