Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1998-09-11
1999-12-14
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
320DIG12, 324430, H02J 700, G01N 27416
Patent
active
060022388
ABSTRACT:
A periodic time-varying current with smallest period 1/f.sub.1 excites a cell/battery and provides a timing reference. Linear circuitry produces two signals, one proportional to the excitation current, the other proportional to the responding time-varying voltage. These signals are processed with identical frequency-limiting filters to attenuate higher-order harmonics and noise. Using the timing reference for synchronization, a microprocessor/microcontroller commands analog to digital converters to sample the frequency-limited current and voltage signals at equally-spaced times over a period and accepts the digitized samples as inputs. The digital samples are averaged over multiple periods and employed to calculate averaged Fourier coefficients of in-phase and quadrature components of frequency-limited current and voltage at frequency f.sub.1. By numerically combining these Fourier coefficients, the microprocessor/microcontroller determines real and imaginary parts of the cell/battery's complex impedance at frequency f.sub.1.
REFERENCES:
patent: 3676770 (1972-07-01), Sharaf et al.
patent: 3753094 (1973-08-01), Furuishi et al.
patent: 4678998 (1987-07-01), Muramatsu
patent: 4697134 (1987-09-01), Burkum et al.
patent: 4743855 (1988-05-01), Randin et al.
patent: 5047722 (1991-09-01), Wurst et al.
patent: 5140269 (1992-08-01), Champlin
patent: 5585728 (1996-12-01), Champlin
patent: 5650937 (1997-07-01), Bounaga
patent: 5773978 (1998-06-01), Becker
"Electrochemical Impedance Spectroscopy in Battery Development and Testing", Batteries International, Apr. 1997, pp. 59 and 62-63.
"Battery Impedance", by E. Willihnganz et al., Electrical Engineering, Sep. 1959, pp. 922-925.
"Determining The End of Battery Life", by S. DeBardelaben, IEEE, 1986, pp. 365-368.
"A Look at the Impedance of a Cell", by S. Debardelaben, IEEE, 1988, pp. 394-397.
"The Impedance of Electrical Storage Cells", by N.A. Hampson et al., Journal of Applied Electrochemistry, 1980, pp. 3-11.
"A Package for Impedance/Admittance Data Analysis", by B. Boukamp, Solid State Ionics, 1986, pp. 136-140.
"Precision of Impedance Spectroscopy Estimates of Bulk, Reaction Rate, and Diffusion Parameters", by J. Macdonald et al., J. Electroanal, Chem., 1991, pp. 1-11.
Toatley , Jr. Gregory J.
Wong Peter S.
LandOfFree
Method and apparatus for measuring complex impedance of cells an does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for measuring complex impedance of cells an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring complex impedance of cells an will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-866672