Method and circuit for quick charging of secondary cell

Details Method and circuit for quick charging of secondary cell Method and circuit for quick charging of secondary cell

1992-10-21

1993-11-09

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 2, 429 7, 429 90, H02J 704, H01M 1400, H01M 1048

Patent

active

052606384

ABSTRACT:
A quick charging method of secondary cell in which a secondary cell is prevented from being damaged on account of overcharging. A strain gage is bonded to the side face of a cell to be charged. A low resistor for quick charging and a high resistor for normal charging connected in parallel are inserted between a charger and the cell. The low resistor for quick charging is connected with the contact of a normally open contact relay. A voltage for measurement is generated according to the resistance of the strain gage and this voltage for measurement is compared with a reference voltage. The relay is ON/OFF controlled by the result of the comparison. Since the resistance of the strain gage is low in the beginning stage of charging, a high voltage for measurement is generated and, thereby, the relay is energized and the contact is closed so that quick charging is performed. When the cell is fully charged, the resistance of the strain gage increases and, thereby, the relay is turned OFF and the quick charging mode is switched to the normal charging mode.

REFERENCES:
patent: 3584285 (1971-06-01), Goodkin
patent: 3656340 (1972-04-01), Ball
patent: 3781751 (1973-12-01), Sulger, Sr.
patent: 4689544 (1987-08-01), Stadnick et al.

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