Method and apparatus for controlling the charging of a secondary

Details Method and apparatus for controlling the charging of a secondary Method and apparatus for controlling the charging of a secondary

1996-05-29

1997-12-30

Tso, Edward

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 35, 320 39, 320 46, H01M 1044, H01M 1046

Patent

active

057034656

ABSTRACT:
A secondary battery is charged with a large current after a time when a voltage across the secondary battery becomes equal to or greater than a decision value while the secondary battery is being charged, until a primary differential of the voltage reaches a decision value which is a threshold for the primary differential which is established depending on the temperature of the secondary battery. When the primary differential reaches the decision value at a time, the charging of the secondary battery with the large current is finished. By monitoring the quadratic differential, it is possible to distinguish an increase in the voltage in an initial charging period from an increase in the voltage in a terminal charging period. After an increase in the voltage in terminal charging period is detected, the end of the charging process is decided based on the decision value of the primary differential of the voltage. Because the time at which the secondary battery is fully charged can accurately be detected, the secondary battery can reliably be fully charged, and is prevented from being unduly excessively charged.

REFERENCES:
patent: 5140252 (1992-08-01), Kitzu et al.
patent: 5444353 (1995-08-01), Shinohara et al.

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