Apparatus, methods and computer program products for estimation of battery reserve life using adaptively modified state of health indicator-based reserve life models
First Claim
1. A method of estimating reserve life for a battery, the method comprising:
- adaptively modifying a model of battery reserve life that is a function of a SOH indicator responsive to intermittent capacity tests of the battery;
monitoring the SOH indicator for the battery to generate SOH indicator values; and
generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life,wherein the adaptively modified model of battery reserve life comprises a first adaptively modified model of battery reserve life;
wherein monitoring the SOH indicator to generate SOH indicator values comprises monitoring a first SOH indicator during a first time interval to generate first SOH indicator values for the first time interval;
wherein generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life comprises generating estimates of reserve life for the first time interval from the generated first SOH indicator values for the first time interval; and
wherein the method further comprises;
monitoring a second SOH indicator to generate second SOH indicator values for a second time interval; and
generating estimates of reserve life from the generated second SOH indicator values according to a second model of battery reserve life.
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Abstract
A model of battery reserve life that a function of a SOH indicator is adaptively modified responsive to intermittent capacity tests of a battery, e.g., based on reserve life estimates generated responsive to the capacity tests. The SOH indicator for the battery is monitored to generate SOH indicator values, and estimates of reserve life are generated from the generated SOH indicator values according to the adaptively modified model of reserve life. For example, a capacity test may be performed responsive to detection of a change in reserve life as estimated by the model of reserve life, and the model of reserve life may be modified responsive to the capacity test. The battery reserve life model may, for example, express reserve life as a function of a float voltage, a float current, a temperature, a charge/discharge cycling, an impedance, a conductance, a resistance, and/or a coup de fouet parameter. The invention may be embodied as methods, apparatus and computer program products.
117 Citations
21 Claims
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1. A method of estimating reserve life for a battery, the method comprising:
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adaptively modifying a model of battery reserve life that is a function of a SOH indicator responsive to intermittent capacity tests of the battery; monitoring the SOH indicator for the battery to generate SOH indicator values; and generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life, wherein the adaptively modified model of battery reserve life comprises a first adaptively modified model of battery reserve life; wherein monitoring the SOH indicator to generate SOH indicator values comprises monitoring a first SOH indicator during a first time interval to generate first SOH indicator values for the first time interval; wherein generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life comprises generating estimates of reserve life for the first time interval from the generated first SOH indicator values for the first time interval; and wherein the method further comprises; monitoring a second SOH indicator to generate second SOH indicator values for a second time interval; and generating estimates of reserve life from the generated second SOH indicator values according to a second model of battery reserve life. - View Dependent Claims (2)
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3. A method of estimating reserve life of a battery, the method comprising:
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generating respective first state of health (SOH) indicator values for respective elapsed times for the battery; generating respective first estimates of reserve life from the first SOH indicator values according to a battery reserve life model; performing a capacity test of the battery to generate a second estimate of reserve life responsive to one of the first estimates of reserve life indicating a change in reserve life exceeding a predetermined threshold; modifying the battery reserve life model based on the second estimate of reserve life; generating a second SOH indicator value; and generating a third estimate of reserve life from the second SOH indicator value according to the modified battery reserve life model. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for estimating battery reserve life, the apparatus comprising:
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means for adaptively modifying a model of battery reserve life that a function of a SOH indicator responsive to intermittent capacity tests of the battery; means for monitoring the SOH indicator for the battery to generate SOH indicator values; and means for generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life, wherein the adaptively modified model of battery reserve life comprises a first adaptively modified model of battery reserve life; wherein the means for monitoring the SOH indicator to generate SOH indicator values comprises means for monitoring a first SOH indicator during a first time interval to generate first SOH indicator values for the first time interval; wherein the means for generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life comprises means for generating estimates of reserve life for the first time interval from the generated first SOH indicator values for the first time interval; and wherein the means for monitoring the SOH indicator to generate SOH indicator values further comprises means for monitoring a second SOH indicator to generate second SOH indicator values for a second time interval; and wherein the means for generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life further comprises means for generating estimates of reserve life from the generated second SOH indicator values according to a second model of battery reserve life. - View Dependent Claims (18)
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19. A method of estimating reserve life for a battery, the method comprising:
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adaptively modifying a model of battery reserve life that is a function of a SOH indicator responsive to intermittent capacity tests of the battery; monitoring the SOH indicator for the battery to generate SOH indicator values; and generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life, wherein the model of battery reserve life comprises a thermal accumulation model of battery reserve life; wherein adaptively modifying a model of battery reserve life that is a function of a SOH indicator responsive to intermittent capacity tests of the battery comprises; performing a capacity test of the battery to generate a capacity estimate; generating an estimate of battery reserve life from a capacity trend model of reserve life; and modifying the thermal accumulation model of battery reserve life based on the estimate of battery reserve life generated from the capacity trend model of battery reserve life; and wherein generating estimates of reserve life from the generated SOH indicator values according to the adaptively modified model of battery reserve life comprises generating an estimate of reserve life according to the modified thermal accumulation model of battery reserve life.
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20. A method of estimating reserve life for a battery, the method comprising:
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generating a first estimate of reserve life using a first model of battery reserve life that is a function of a SOH indicator; conducting a discharge test of the battery to generate a battery capacity estimate; generating a second estimate of reserve life from the generated battery capacity estimate using a second model of battery reserve life; modifying the first model of reserve life based on the second estimate of reserve life responsive to the second estimate indicating a reserve life that is less than a reserve life indicated by the first estimate; and generating a third estimate of reserve life using the modified first model of battery reserve life. - View Dependent Claims (21)
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Specification