Method and system for battery state of charge estimation
First Claim
1. A method of estimating a battery state of charge, comprising the steps of:
- measuring a battery voltage when a charger is on;
measuring a battery voltage when the charger is subsequently turned off;
calculating a difference between the battery voltage when the charger is on and when the charger is subsequently turned off; and
dividing the difference by an impedance value stored in a memory to estimate a current that the battery is being charged at.
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Accused Products
Abstract
A method (20 or 30) and system (40) for estimating a battery state of charge can include a memory (48) for storing at least one among an impedance value, a plurality of values for V drop 0-1, or a plurality of values for V drop 0-1 normalized for charge or discharge values providing a stored plurality of values. The system can include a processor (44) and can measure at least one among V drop C-0 providing a measured V drop C-0 value and V drop 0-1 for the providing a measured V drop 0-1 value. The processor can be programmed to perform the functions of dividing the V drop C-0 value by the impedance value to estimate a charging current at the battery or comparing the measured V drop 0-1 value with a value among the stored plurality of values to estimate the battery state of charge.
11 Citations
19 Claims
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1. A method of estimating a battery state of charge, comprising the steps of:
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measuring a battery voltage when a charger is on;
measuring a battery voltage when the charger is subsequently turned off;
calculating a difference between the battery voltage when the charger is on and when the charger is subsequently turned off; and
dividing the difference by an impedance value stored in a memory to estimate a current that the battery is being charged at. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of estimating a battery state of charge in an electronic device, comprising the steps of:
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storing at least one among a plurality of values for V drop 0-1 for a given battery and a plurality of values for V drop 0-1 for the given battery normalized for charge or discharge values providing a stored plurality of values;
measuring V drop 0-1 for the given battery providing a measured V drop 0-1 value; and
comparing the measured V drop 0-1 value with at least one value among the stored plurality of values to estimate the battery state of charge. - View Dependent Claims (9, 10, 11)
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12. A system for estimating a battery state of charge, comprising:
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a memory for storing at least one among an impedance value, a plurality of values for V drop 0-1 and a plurality of values for V drop 0-1 for a given battery normalized for charge or discharge values providing a stored plurality of values a measuring device measuring at least one among V drop C-0 for the given battery providing a measured V drop C-0 value and V drop 0-1 for the given battery providing a measured V drop 0-1 value; and
a processor programmed to perform at least one among the functions of;
dividing the V drop C-0 value by the impedance value to estimate a current that the battery is being charged at; and
comparing the measured V drop 0-1 value with at least value among stored plurality of values to estimate the battery state of charge. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification