Lithium cell recharging

Details Lithium cell recharging Lithium cell recharging

1997-03-05

1999-04-27

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Process of cell operation

429 61, 320162, H01M 1044

Patent

active

058979735

ABSTRACT:
Excessive charging of the weaker cells in a battery of lithium cells, during potentiostatic charging, is prevented by providing each cell (S) with a bypass circuit (12) including a MOSFET (T). An integrated circuit (Y) monitors the cell voltage, and if the design voltage of the cell (S) is exceeded the circuit (Y) provides a signal to the gate of the MOSFET (T) so that part of the charging current (I) bypasses that cell (S), while most of the charging current flows through the cell (S). The bypass current flows only while each of the other cells in the battery are coming up to the design voltage, so that little power is dissipated in the bypass circuit (12). If the cells are balanced, so they accept charge equally, then the bypass circuit never carries current; if the cells are not balanced, they will be brought near to balance over a few charge/discharge cycles.

REFERENCES:
patent: 4238721 (1980-12-01), DeLuca et al.
patent: 4869975 (1989-09-01), Eppley et al.
patent: 4935315 (1990-06-01), Herrin
patent: 5119009 (1992-06-01), McCaleb et al.
patent: 5283512 (1994-02-01), Stadnick et al.
patent: 5307000 (1994-04-01), Podrazhansky et al.
patent: 5387857 (1995-02-01), Honda et al.
patent: 5637413 (1997-06-01), Fernandez et al.

Affiliated with

Also associated with

Rating

Lithium cell recharging does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lithium cell recharging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lithium cell recharging will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-685386