Method and apparatus for detecting the state of charge of a batt

Details Method and apparatus for detecting the state of charge of a batt Method and apparatus for detecting the state of charge of a batt

1991-11-18

1993-02-09

Skudy, R.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 20, H01M 1044

Patent

active

051855666

ABSTRACT:
A method and apparatus for detecting the state of charge of a battery during charging or discharging thereof. Voltage levels across the battery are measured during battery charging or discharging, and compared with preset values representative of a normal battery characteristic charge or discharge curve. The normal charge or discharge curve is modified responsive particular battery characteristics indicated by measured battery voltage levels, and, preferably, also responsive to measured battery temperature levels to form a modified normal battery charge or discharge curve. The modified normal battery charge or discharge curve is divided into curve portions defined by voltage levels and rates of changes of the voltage levels. Each curve portion defines a particular state of charge of the battery. Measured voltage levels and rates of changes thereof may then be associated with a modified normal battery charge or discharge curve portion and a particular state of charge or discharge curve portion and a particular state of charge defined thereby.

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"Available Battery Time Sensor" by F. A. Ferraiolo and A. E. Gass, IBM Technical Disclosure Bulletin, vol. 16 No. 5, Oct. 1973.

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