PURPOSE: To permit the charging of a battery with a big current by a method wherein a capacitor, capable of accumulating an electric energy more than a secondary battery capable of charging and discharging, is connected in parallel while the charging current from the capacitor is controlled based on the specification of the secondary battery.
CONSTITUTION: A big capacity capacitor 2, capable of accumulating more amount of energy than a secondary battery 1, is connected in parallel to the secondary battery 1 through a reverse current precluding diode 4 and a current limiting circuit 5, connected in parallel to the diode 4, while the terminals of the capacitor 2 are utilized as external terminals. The current limiting circuit 5 limits a current higher than a charging current determined in the specification of the secondary battery 1. Both terminals of the capacitor 2 are connected to an external power source to charge the capacitor with a big current while the Zener diode of a monitor circuit 3 is put ON when the voltage of the Zener diode 31 has arrived at the Zener voltage thereof whereby a voltage is generated in the diode 32 and charging is stopped. Subsequently, the secondary battery 1 is charged with a current, limited by the current limiting circuit 5 based on the specification of the secondary battery and conducted through the capacitor 2. According to this method, the overcharging of the secondary battery may be prevented even if the big current charging of a short time is effected and the long life of the battery may be kept.
AZEYANAGI JUNZO
NISHITANI TADAKUNI
KURABAYASHI KEN
TSUCHIYA YOSHINOBU
| JPS60173062A | 1985-09-06 | |||
| JPS6020733A | 1985-02-02 |