Method and apparatus for charging a secondary battery

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

1995-02-23

1996-12-31

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 23, 320 39, H01M 1044, H01M 1046

Patent

active

055897550

ABSTRACT:
A secondary battery is charged with a constant voltage, while a charging current generated by the application of the constant voltage is monitored. After the charging current becomes smaller than a predetermined current value, an open circuit voltage of the secondary battery is sampled at a predetermined interval while substantially stopping charging. Charging is completed, when either a voltage difference between a terminal voltage of the secondary battery and the sampled open circuit voltage becomes smaller than a predetermined voltage difference value, the sampled open circuit voltage becomes bigger than a predetermined voltage value, or, a remaining charging time of a timer which is calculated based on the sampled open circuit voltage has elapsed. The method shortens the charging time and enables the correct detection of the fully charged state.

REFERENCES:
patent: 5028860 (1991-07-01), Amano
patent: 5172044 (1992-12-01), Sasaki
patent: 5179335 (1993-01-01), Nor
patent: 5408170 (1995-04-01), Umetsu et al.
patent: 5442274 (1995-08-01), Tamai

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