Method, system and computer-readable media for measuring impedance of an energy storage device
First Claim
1. A method of measuring impedance of an energy storage device, comprising:
- generating an excitation time record comprising a summation of one or more sinusoidal signals with a frequency step factor of octave harmonics therebetween;
stimulating an energy storage device with the excitation time record;
during the stimulating, capturing a response time record at a sampling frequency, the response time record indicative of a response of the energy storage device to the excitation time record; and
rectifying the response time record relative to a sine and a cosine for at least one of the one or more sinusoidal signals to determine at least one of an in-phase component and a quadrature component of an impedance of the energy storage device.
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Abstract
Real-time battery impedance spectrum is acquired using a one-time record. Fast Summation Transformation (FST) is a parallel method of acquiring a real-time battery impedance spectrum using a one-time record that enables battery diagnostics. An excitation current to a battery is a sum of equal amplitude sine waves of frequencies that are octave harmonics spread over a range of interest. A sample frequency is also octave and harmonically related to all frequencies in the sum. A time profile of this sampled signal has a duration that is a few periods of the lowest frequency. A voltage response of the battery, average deleted, is an impedance of the battery in a time domain. Since the excitation frequencies are known and octave and harmonically related, a simple algorithm, FST, processes the time profile by rectifying relative to sine and cosine of each frequency. Another algorithm yields real and imaginary components for each frequency.
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Citations
25 Claims
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1. A method of measuring impedance of an energy storage device, comprising:
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generating an excitation time record comprising a summation of one or more sinusoidal signals with a frequency step factor of octave harmonics therebetween; stimulating an energy storage device with the excitation time record; during the stimulating, capturing a response time record at a sampling frequency, the response time record indicative of a response of the energy storage device to the excitation time record; and rectifying the response time record relative to a sine and a cosine for at least one of the one or more sinusoidal signals to determine at least one of an in-phase component and a quadrature component of an impedance of the energy storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computing system configured for executing instructions for determining impedance of an energy storage device, the instructions configured to cause the computing system to:
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generate an excitation time record comprising a summation of one or more sinusoidal signals with a frequency step factor of octave harmonics therebetween; stimulate an energy storage device with the excitation time record; during the stimulating, capture a response time record at a sampling frequency, the response time record indicative of a response of the energy storage device to the excitation time record; and rectify the response time record relative to a sine and a cosine for at least one of the one or more sinusoidal signals to determine at least one of an in-phase component and a quadrature component of an impedance of the energy storage device. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Non-transitory computer-readable media including instructions, which when executed by a computing system cause the computing system to:
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capture a response time record at a sampling frequency during stimulation of an energy storage device with an excitation time record, the excitation time record comprising a summation of one or more sinusoidal signals with a frequency step factor of octave harmonics therebetween, and the response time record indicative of a response of the energy storage device to the excitation time record; and rectify the response time record relative to a sine and a cosine for at least one of the one or more sinusoidal signals to determine at least one of an in-phase component and a quadrature component of an impedance of the energy storage device. - View Dependent Claims (24, 25)
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Specification