Systems and methods to determine the condition of a battery
First Claim
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1. A method for assessing a condition of a battery, the method comprising:
- measuring, by a data acquisition board, a terminal voltage of the battery over time while discharging the battery at a predetermined current;
calculating, by a processor, a first slope of a natural logarithm of a rate of change of a first voltage of the battery over time based on the terminal voltage of the battery;
comparing, by the processor, the calculated first slope to a threshold slope that is based on measurement of at least one of a plurality of similar batteries with known condition; and
displaying, by the processor, a result of said comparing on a display, wherein said result corresponds to a damage level of the battery,wherein the threshold slope is determined by;
damaging at least one of the plurality of similar batteries,for each of the at least one of the plurality of similar batteries, recharging the respective battery to an initial state of charge,for each of the at least one of the plurality of similar batteries, measuring a terminal voltage of the respective battery over time while discharging the respective battery at the predetermined current,for each of the at least one of the plurality of similar batteries, calculating second slope of a natural logarithm of a rate of change of a second voltage of the respective battery over time based on the terminal voltage of the respective battery, andderiving the threshold slope from each of the calculated second slopes.
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Abstract
Systems and methods for determining the damage level of a battery are provided. An exemplary method includes measuring a terminal voltage of the battery over time while discharging the battery at a predetermined current; calculating a slope of a natural logarithm of a rate of change of a first voltage of the battery over time based on the terminal voltage of the battery; and comparing the calculated slope to a threshold slope that is based on measurements of a plurality of similar batteries with known conditions. The first voltage of the battery may correspond to a voltage across an RC component of an equivalent circuit model for the battery.
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14 Claims
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1. A method for assessing a condition of a battery, the method comprising:
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measuring, by a data acquisition board, a terminal voltage of the battery over time while discharging the battery at a predetermined current; calculating, by a processor, a first slope of a natural logarithm of a rate of change of a first voltage of the battery over time based on the terminal voltage of the battery; comparing, by the processor, the calculated first slope to a threshold slope that is based on measurement of at least one of a plurality of similar batteries with known condition; and displaying, by the processor, a result of said comparing on a display, wherein said result corresponds to a damage level of the battery, wherein the threshold slope is determined by; damaging at least one of the plurality of similar batteries, for each of the at least one of the plurality of similar batteries, recharging the respective battery to an initial state of charge, for each of the at least one of the plurality of similar batteries, measuring a terminal voltage of the respective battery over time while discharging the respective battery at the predetermined current, for each of the at least one of the plurality of similar batteries, calculating second slope of a natural logarithm of a rate of change of a second voltage of the respective battery over time based on the terminal voltage of the respective battery, and deriving the threshold slope from each of the calculated second slopes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for assessing a condition of a battery, the apparatus comprising:
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a display; a data acquisition board that measures a terminal voltage of the battery over time while the battery is discharged at a predetermined current; and a processor that; calculates a first slope of a natural logarithm of a rate of change of a first voltage of the battery over time based on the terminal voltage of the battery, compares the calculated first slope to a threshold slope that is based on measurements of at least one of a plurality of similar batteries with known conditions; and displays a result of said comparison on the display, wherein said result corresponds to a damage level of the battery, wherein the threshold slope is determined by; damaging at least one of the plurality of similar batteries, for each of the at least one of the plurality of similar batteries, recharging the respective battery to an initial state of charge, for each of the at least one of the plurality of similar batteries, measuring a terminal voltage of the respective battery over time while discharging the respective battery at the predetermined current, for each of the at least one of the plurality of similar batteries, calculating a second slope of a natural logarithm of a rate of change of a second voltage of the respective battery over time based on the terminal voltage of the respective battery, and deriving the threshold slope from the calculated second slopes. - View Dependent Claims (11, 12, 13, 14)
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Specification