Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1992-05-28
1994-10-04
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 48, 324430, 324431, G01N 2727, G01N 2704
Patent
active
053529685
ABSTRACT:
Method and apparatus for accurately determining the charge state of a battery is disclosed. The charge state is derived from the battery voltage, which is corrected for errors introduced by temperature and series resistance. Error from series resistance is minimized by either making an open circuit voltage measurement, or by making a plurality of voltage measurements under known load conditions, calculating the series resistance from these measurements, and calculating an equivalent open circuit voltage, compensating for the voltage drop caused by the series resistance of the battery. Errors introduced by temperature induced shifts in battery voltage are corrected by reading the battery temperature and correcting the battery voltage to a reference temperature. The battery voltage corrected for temperature and series resistance effects is used to compute charge state by table look up or algebraically.
REFERENCES:
patent: 3940679 (1976-02-01), Brandwein et al.
patent: 3959707 (1976-05-01), Stephens
patent: 4308492 (1981-12-01), Mori et al.
patent: 4308493 (1981-12-01), Kothe et al.
patent: 4377787 (1983-03-01), Kikuoka et al.
patent: 4382221 (1983-05-01), Reynolds
patent: 4423378 (1983-12-01), Marino et al.
patent: 4667143 (1987-05-01), Cooper et al.
patent: 4725784 (1988-02-01), Peled et al.
patent: 4843299 (1989-06-01), Hutchings
patent: 4912416 (1990-03-01), Champlin
patent: 5162741 (1992-11-01), Bates
patent: 5237257 (1993-08-01), Johnson et al.
Culbert Michael F.
Reni Daniele
Apple Computer Inc.
Dougherty Thomas M.
Martin Robert T.
Stephan Steven L.
LandOfFree
Battery charge state determination does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Battery charge state determination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Battery charge state determination will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-583874