Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1990-04-03
1991-04-30
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 35, 320 43, 320 48, 324427, 324431, G01N 2746, H02J 700
Patent
active
050121766
ABSTRACT:
The present invention is an apparatus and a method for determining the state of charge of a rechargeable battery. It comprises a means for charging the batter, current sensors, heat detectors for detecting the heat emanating from the battery during charging, with the heat being the complement of the charge acceptance percentage, and a processor for storing a mathematical charge acceptance model for providing the relationship between the charge acceptance percentage and the state of charge of the battery, and for calculating the state of charge of the battery from the heat detected by the heat detectors and the charge acceptance model. An accurate measure of battery charge state is produced while the battery is being charged. This provides information concerning the operability of the battery and also allows efficient charging to avoid energy waste. The present invention is adaptable to existing battery power systems without the need for significant additional components and is applicable to any system utilizing rechargeable batteries.
REFERENCES:
patent: 3617850 (1971-11-01), Domshy
patent: 3732481 (1973-05-01), Mas
patent: 4151454 (1979-04-01), Iida
patent: 4153867 (1979-05-01), Jungfer et al.
patent: 4423378 (1983-12-01), Marino et al.
Baxter International Inc.
Hickey R. J.
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