Estimating Battery Cell Parameters
First Claim
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1. A computer-implemented method comprising:
- drawing a first amount of current from a battery cell of a computing device;
measuring, while the first amount of current is drawn, a first instance of the battery cell'"'"'s voltage;
drawing a second amount of current from the battery cell;
measuring, while the second amount of current is drawn, a second instance of the battery cell'"'"'s voltage; and
estimating an internal resistance of the battery cell based on the first and second amounts of current drawn from the battery cell and the first and second instances of the battery cell'"'"'s voltage.
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Abstract
This document describes techniques and apparatuses for estimating battery cell parameters. In some embodiments, these techniques and apparatuses enable the isolation of a battery cell from other battery cells. Voltage levels of the isolated battery cell are measured while varying amounts of current are drawn from the cell. Parameters of the isolated battery cell can then be estimated based on the measured voltage levels and various amounts of current that are drawn from the cell.
24 Citations
20 Claims
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1. A computer-implemented method comprising:
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drawing a first amount of current from a battery cell of a computing device; measuring, while the first amount of current is drawn, a first instance of the battery cell'"'"'s voltage; drawing a second amount of current from the battery cell; measuring, while the second amount of current is drawn, a second instance of the battery cell'"'"'s voltage; and estimating an internal resistance of the battery cell based on the first and second amounts of current drawn from the battery cell and the first and second instances of the battery cell'"'"'s voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-implemented method comprising:
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drawing a known amount of current from a battery cell of a computing device effective to discharge the battery cell; ceasing to draw the known amount of current from the battery cell effective to interrupt discharging of the battery cell; measuring, at a first point in time immediately after ceasing to draw the known amount of current, a first instance of the battery cell'"'"'s voltage; measuring, at a second point in time that follows the first point in time, a second instance of the cell'"'"'s voltage; and estimating a capacitance or concentration resistance of the battery cell based on at least the known amount of current and the first and second instances of the battery cell'"'"'s voltage. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system comprising:
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multiple battery cells from which the system draws current to operate; switching circuitry configured to enable current to be drawn from or applied to each of the multiple battery cells; sensing circuitry configured to measure respective voltage levels of the multiple battery cells of the system; and a battery parameter estimator configured to perform operations comprising; isolating, via the switching circuitry, a battery cell from the multiple battery cells of the system; drawing, via the switching circuitry, a first amount of current from the isolated battery cell; measuring, via the sensing circuitry and while the first amount of current is drawn, a first voltage level of the isolated battery cell; drawing, via the switching circuitry, a second amount of current from the isolated battery cell; measuring, via the sensing circuitry and while the second amount of current is drawn, a second voltage level of the isolated battery cell; and estimating an internal resistance of the isolated battery cell based on the first and second amounts of current drawn from the isolated battery cell and the first and second voltage levels of the isolated battery cell. - View Dependent Claims (17, 18, 19, 20)
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Specification