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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Accused Products
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.
37 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