Reversible automatic cell bypass circuit

Details Reversible automatic cell bypass circuit Reversible automatic cell bypass circuit

1991-12-09

1993-11-02

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

With control means responsive to battery condition sensing...

429 90, 337 15, H01M 1046

Patent

active

052582442

ABSTRACT:
A bypass circuit for a rechargeable battery cell has first and second normally open switches in parallel across the cell. The first switch, which can be a backward-biased rectifier, shunts the discharge current between the cell terminals if the battery cell fails but reopens if the battery cell recovers. The second switch shunts the charging current between the cell terminals if the battery cell fails but reopens if the cell recovers. The second switch can be a normally open FET transistor biased to close only when the cell voltage V.sub.C substantially exceeds a normal peak charging voltage V.sub.P. A rechargeable battery system in which the cells are series connected can incorporate a separate bypass circuit across each cell to enable the remaining good cells to continue charging and discharging even if a particular cell fails.

REFERENCES:
patent: 3213345 (1965-10-01), Loftus
patent: 4774558 (1988-09-01), Herrin
patent: 4882239 (1989-11-01), Grimmer et al.
patent: 4910103 (1990-03-01), Yoshikawa et al.
patent: 4935315 (1990-06-01), Herrin
patent: 4992340 (1991-02-01), Tidwell et al.
patent: 5017856 (1991-05-01), Johnson

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