Methods of controlling the application and termination of charge

Details Methods of controlling the application and termination of charge Methods of controlling the application and termination of charge

1993-10-13

1997-02-04

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 24, 320 39, 320 48, H01N 1044

Patent

active

056002262

ABSTRACT:
As a substantially constant charge current is applied to a battery, the voltage is periodically measured and the slope of the voltage characteristic is calculated. The minimum slope of the bottom peak of the slope profile is dynamically identified and, as appropriate, updated and stored. With each identification and update of the minimum slope, a trigger threshold between the minimum slope and top peak is defined, and then stored, by adding a trigger value to the minimum slope. A termination threshold or value between the minimum slope and the trigger threshold may also be calculated and stored with each such identification and update of the minimum slope. When the calculated slope, increasing from the bottom peak, reaches the trigger threshold, the method is armed--as by setting a trigger threshold flag--so that when the calculated slope thereafter once again passes through the trigger threshold and then reaches the termination threshold, full-current charging of the battery is terminated. The termination threshold--which identifies the substantially fully-charged state of the battery--may, in some forms of the invention, be preset to equal the minimum slope value. Premature termination resulting from a high impedance spike or inflection point occurring in the voltage profile when charging current is initially applied to the battery may be avoided by gradually increasing the applied charging current at the beginning of the charging process.

REFERENCES:
patent: 3597673 (1971-08-01), Burkett et al.
patent: 3936718 (1976-02-01), Melling et al.
patent: 4134056 (1979-01-01), Fukui et al.
patent: 4227141 (1980-10-01), Cross
patent: 4354148 (1982-10-01), Tada et al.
patent: 4385269 (1983-05-01), Aspinwall et al.
patent: 4388582 (1983-06-01), Saar et al.
patent: 4392101 (1983-07-01), Saar et al.
patent: 4503378 (1985-03-01), Jones et al.
patent: 4639655 (1987-01-01), Westhaver et al.
patent: 4677363 (1987-06-01), Kopmann
patent: 4746852 (1988-05-01), Martin
patent: 4746854 (1988-05-01), Baker et al.
patent: 4755735 (1988-07-01), Inakagata
patent: 4767977 (1988-08-01), Fasen et al.
patent: 4806840 (1989-02-01), Alexander et al.
patent: 4829225 (1989-05-01), Podrashansky et al.
patent: 4855663 (1989-08-01), Matsui et al.
patent: 4959604 (1990-09-01), Cuesta
patent: 5140251 (1992-08-01), Wu
patent: 5140252 (1992-08-01), Kisa et al.
patent: 5180961 (1993-01-01), Tsujino
patent: 5350996 (1994-09-01), Tauchi

Affiliated with

Also associated with

Rating

Methods of controlling the application and termination of charge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods of controlling the application and termination of charge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of controlling the application and termination of charge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-682320