William Patrick Morrison

US Patent:

7395163, Jul 1, 2008

Filed:

Jul 5, 2007

Appl. No.:

11/825629

Inventors:

John L. Morrison - Butte MT, US
William H. Morrison - Manchester CT, US

Assignee:

Montana Tech of the University of Montana - Butte MT

International Classification:

G01R 23/00
G06F 11/00

US Classification:

702 75, 702 79, 702117, 324603

Abstract:

Real time battery impedance spectrum is acquired using one time record, Compensated Synchronous Detection (CSD). This parallel method enables battery diagnostics. The excitation current to a test battery is a sum of equal amplitude sin waves of a few frequencies spread over range of interest. The time profile of this signal has duration that is a few periods of the lowest frequency. The voltage response of the battery, average deleted, is the impedance of the battery in the time domain. Since the excitation frequencies are known, synchronous detection processes the time record and each component, both magnitude and phase, is obtained. For compensation, the components, except the one of interest, are reassembled in the time domain. The resulting signal is subtracted from the original signal and the component of interest is synchronously detected. This process is repeated for each component.

US Patent:

8150643, Apr 3, 2012

Filed:

Jun 30, 2008

Appl. No.:

12/217013

Inventors:

John L. Morrison - Butte MT, US
William H. Morrison - Manchester CT, US
Jon P. Christophersen - Idaho Falls ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID
Montana Tech of the University of Montana - Butte MT
Qualtech Systems, Inc. - East Hartford CT

International Classification:

G01R 23/00
G06F 11/00

US Classification:

702 75, 702 79, 702117, 324603

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. The time profile of this signal has a duration that is a few periods of the lowest frequency. The voltage response of the battery, average deleted, is the impedance of the battery in the time domain. Since the excitation frequencies are known and octave and harmonically related, a simple algorithm, FST, processes the time record by rectifying relative to the sine and cosine of each frequency. Another algorithm yields real and imaginary components for each frequency.

US Patent:

20100332165, Dec 30, 2010

Filed:

Jun 11, 2010

Appl. No.:

12/813750

Inventors:

John L. Morrison - Butte MT, US
William H. Morrison - Manchester CT, US
Jon P. Christophersen - Idaho Falls ID, US
Chester G. Motloch - Idaho Falls ID, US

International Classification:

G01R 23/16
G01R 31/36
G06F 19/00

US Classification:

702 63, 702 77

Abstract:

Electrochemical Impedance Spectrum (EIS) data are used directly to predict the pulse performance of an energy storage device. The impedance spectrum of the EIS is obtained in-situ using pre-existing techniques. A simulation waveform is configured such that the period of the pulse is greater than or equal to the lowest frequency of the impedance measurement. If the pulse is assumed to be periodic for analysis purposes, the complex Fourier series coefficients can be obtained. The number of harmonic constituents are selected so as to appropriately resolve the response, but the maximum frequency should be less than or equal to the highest frequency of the impedance measurement. In some cases, the measured frequencies of the impedance spectrum do not match the corresponding harmonic components of the simulated pulse wave. This is resolved by estimating the impedance measurements at the desired frequencies using linear interpolation, cubic spline fits, or other comparable methods. Using a current pulse as an example, the Fourier coefficients of the pulse are multiplied by the impedance spectrum at the corresponding frequency to obtain the Fourier coefficients of the voltage response to the desired pulse. The Fourier coefficients of the response are then summed reassemble to obtain the overall time domain estimate of the voltage using the Fourier series analysis. Thus, the response of an energy storage device to an anticipated or desired pulse can be estimated using low-level, charge neutral impedance measurements combined with Fourier series analysis.

US Patent:

20110270559, Nov 3, 2011

Filed:

May 3, 2011

Appl. No.:

13/100170

Inventors:

Jon P. Christophersen - Idaho Falls ID, US
John L. Morrison - Butte MT, US
William H. Morrison - Manchester CT, US
Chester G. Motloch - Idaho Falls ID, US

Assignee:

BATTELLE ENERGY ALLIANCE, LLC - Idaho Falls ID

International Classification:

G06F 19/00
G01R 27/28
G01R 35/00

US Classification:

702 65, 324601, 324649

Abstract:

An impedance analysis system for characterizing an energy storage device (ESD) includes a signal vector assembler to generate a signal vector from a composition of one or more waveforms and a signal generator for generating a stimulus signal responsive to the signal vector. A signal measurement device measures a response signal indicative of a response of the ESD substantially simultaneously with when the stimulus signal is applied to the energy storage device. A load variation monitor monitors load variations on the energy storage device due to operational circuitry coupled thereto. An analyzer is operably coupled to the response signal and analyzes the response signal relative to the signal vector to determine an impedance of the energy storage device.

US Patent:

20120032688, Feb 9, 2012

Filed:

May 3, 2011

Appl. No.:

13/100184

Inventors:

Jon P. Christophersen - Idaho Falls ID, US
John L. Morrison - Butte MT, US
William H. Morrison - Manchester CT, US
Chester G. Motloch - Idaho Falls ID, US
David M. Rose - Mountlake Terrace WA, US

Assignee:

BATTELLE ENERGY ALLIANCE, LLC - Idaho Falls ID

International Classification:

G01R 27/28

US Classification:

324612

Abstract:

Estimating impedance of energy storage devices includes generating input signals at various frequencies with a frequency step factor therebetween. An excitation time record (ETR) is generated to include a summation of the input signals and a deviation matrix of coefficients is generated relative to the excitation time record to determine crosstalk between the input signals. An energy storage device is stimulated with the ETR and simultaneously a response time record (RTR) is captured that is indicative of a response of the energy storage device to the ETR. The deviation matrix is applied to the RTR to determine an in-phase component and a quadrature component of an impedance of the energy storage device at each of the different frequencies with the crosstalk between the input signals substantially removed. This approach enables rapid impedance spectra measurements that can be completed within one period of the lowest frequency or less.