Method and apparatus for charging a battery and for determining

Details Method and apparatus for charging a battery and for determining Method and apparatus for charging a battery and for determining

1996-07-31

1998-06-02

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 21, 320 14, 320 39, 320 19, H02J 700, H01M 1044

Patent

active

057605688

ABSTRACT:
The invention is related to a charging device (1) in which the charging current (I.sub.ch) used for charging a battery (2) is chopped according to a certain duty cycle (.eta.). A certain charging voltage reference value (V.sub.ch), which equals the real open circuit voltage of the battery charged, is known to the charging device (1). To achieve a correct duty cycle (.eta.), the terminal voltage of the battery is measured during the charging current pulse (I.sub.on) and between the pulses. The open circuit voltage of the battery is calculated on the basis of the measurement results using the formula

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patent: 5296797 (1994-03-01), Bartlett
patent: 5321347 (1994-06-01), Chien
patent: 5381096 (1995-01-01), Hirzel
patent: 5408170 (1995-04-01), Umetsu et al.
patent: 5446364 (1995-08-01), Naskali
patent: 5523667 (1996-06-01), Feldstein

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