Battery charger and charging method of secondary batteries

Details Battery charger and charging method of secondary batteries Battery charger and charging method of secondary batteries

1999-01-11

2000-08-08

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With peak detection of current or voltage

320160, 320125, H02J 700

Patent

active

061006688

ABSTRACT:
A battery to be charged is preliminary charged with a first charge current. If a presumption can be made such that the battery has reached a fully charged condition before expiration of a first predetermined period of time during which the battery is charged with the first charge current, it is determined that either a fully charged battery or an inactive battery is subject to charging. Then, the battery is preliminary charged with a second charge current. If a fully charged presumption can be made before expiration of a second predetermined period of time during which the battery is charged with the second charge current, it is determined that the battery is already fully charged, whereas if such a presumption cannot be made during the second predetermined period of time, it is determined that the battery is the inactive battery. In the latter case and also in the case where the battery is determined to be an active battery resulting from the determination that a fully charged presumption cannot be made during charging with the first charge current for the first predetermined period of time, the battery is charged with a third charged current until it becomes fully charged.

REFERENCES:
patent: 5550453 (1996-08-01), Bohne et al.
patent: 5552693 (1996-09-01), Nishikawa
patent: 5554920 (1996-09-01), Kokuga
patent: 5621302 (1997-04-01), Shinohara
patent: 5627452 (1997-05-01), Okada

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