Negative cell detector for a multi-cell fuel cell stack

Details Negative cell detector for a multi-cell fuel cell stack Negative cell detector for a multi-cell fuel cell stack

1978-08-23

1980-04-15

Tokar, M.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

340636, 324133, G01N 2742

Patent

active

041985974

ABSTRACT:
A detector for sensing defective cells among a plurality of voltage producing cells which together form a source of DC electrical power. A series of light emitting diodes are coupled to the positive and negative junctions of each voltage producing cell so that they are biased to a nonconducting state so long as the cell has a positive output voltage. In the event that a cell becomes defective causing its voltage output to drop, the voltage produced by the remaining cells create a load current by which the defective cell goes negative and forward biases the corresponding light emitting diode. In turn, the light emitting diode changes to its conducting state whereupon it emits light and identifies the defective cell.

REFERENCES:
patent: 2621231 (1952-12-01), Medlar et al.
patent: 3500372 (1970-03-01), Thiele
patent: 3515983 (1970-06-01), Lante
patent: 3534354 (1970-10-01), Galginaitis
patent: 3586962 (1971-06-01), Rebstock
patent: 3796951 (1974-03-01), Joseph
patent: 3872457 (1975-03-01), Ray
patent: 3942104 (1976-03-01), Byrne

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