Estimation of State-Of-Health in Batteries
First Claim
1. A method for online estimation of a state-of-health in a chemical battery, the method comprising:
- determining if a terminal voltage of the chemical battery differs from a calculated terminal voltage;
in response to determining that the terminal voltage of the chemical battery differs from the calculated terminal voltage, calculating a range of voltages by taking the convolution of a terminal current of the chemical battery with a range of impulse responses from a look up table of impulse responses corresponding to different states-of-health;
comparing the terminal voltage of the chemical battery with the range of calculated voltages to determine a second impulse response that corresponds to the case where the terminal voltage matches the calculated voltage; and
using the look up table of impulse responses corresponding to different states-of-health to determine the state-of-health of the chemical battery from the second impulse response.
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Abstract
Methods and apparatuses for estimation of a state-of-health in a battery are disclosed. An example method comprises: determining if a terminal voltage of the chemical battery differs from a calculated terminal voltage; in response to determining that the terminal voltage of the chemical battery differs from the calculated terminal voltage, calculating a range of voltages by taking the convolution of a terminal current of the chemical battery with a range of impulse responses from a look up table of impulse responses corresponding to different states-of-health; comparing the terminal voltage of the chemical battery with the range of calculated voltages to determine a second impulse response that corresponds to the case where the terminal voltage matches the calculated voltage; and using the look up table of impulse responses corresponding to different states-of-health to determine the state-of-health of the chemical battery from the second impulse response. Other embodiments are described and claimed.
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Citations
26 Claims
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1. A method for online estimation of a state-of-health in a chemical battery, the method comprising:
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determining if a terminal voltage of the chemical battery differs from a calculated terminal voltage; in response to determining that the terminal voltage of the chemical battery differs from the calculated terminal voltage, calculating a range of voltages by taking the convolution of a terminal current of the chemical battery with a range of impulse responses from a look up table of impulse responses corresponding to different states-of-health; comparing the terminal voltage of the chemical battery with the range of calculated voltages to determine a second impulse response that corresponds to the case where the terminal voltage matches the calculated voltage; and using the look up table of impulse responses corresponding to different states-of-health to determine the state-of-health of the chemical battery from the second impulse response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for estimating a state-of-health in an online chemical battery, the apparatus comprising:
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one or more processors; and one or more memory units coupled to the processors, the apparatus being configured to; determine if a terminal voltage of the chemical battery differs from a calculated terminal voltage; in response to determining that the terminal voltage of the chemical battery differs from the calculated terminal voltage, calculate a range of voltages by taking the convolution of a terminal current of the chemical battery with a range of impulse responses from a look up table of impulse responses corresponding to different states-of-health; compare the terminal voltage of the chemical battery with the range of calculated voltages to determine a second impulse response that corresponds to the case where the terminal voltage matches the calculated voltage; and use the look up table of impulse responses corresponding to different states-of-health to determine the state-of-health of the chemical battery from the second impulse response. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus for online estimation of a state-of-health in a chemical battery, comprising:
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means for determining if a terminal voltage of the chemical battery differs from a calculated terminal voltage; in response to means for determining that the terminal voltage of the chemical battery differs from the calculated terminal voltage, means for calculating a range of voltages by taking the convolution of a terminal current of the chemical battery with a range of impulse responses from a look up table of impulse responses corresponding to different states-of-health; means for comparing the terminal voltage of the chemical battery with the range of calculated voltages to determine a second impulse response that corresponds to the case where the terminal voltage matches the calculated voltage; and means for using the look up table of impulse responses corresponding to different states-of-health to determine the state-of-health of the chemical battery from the second impulse response.
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21. An apparatus, comprising:
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a battery; a state-of-charge (SOC) Estimator coupled to the battery; a first look up table coupled to the SOC Estimator; a second look up table receiving a measured temperature of the battery; a first convolution device coupled to the first look up table and a pattern recognition device; a second convolution device coupled to the second look up table and the pattern recognition device; and the pattern recognition device coupled to the battery, the first convolution device, and the second convolution device, wherein the pattern recognition device receives a calculated voltage of the battery, a measured voltage of the battery, and a calculated range of voltages and outputs at least one of;
a state-of-health of the battery, a possible fault of the battery, and a life time of the battery. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification