Integrated fuel cell stack shunt current prevention arrangement

Details Integrated fuel cell stack shunt current prevention arrangement Integrated fuel cell stack shunt current prevention arrangement

1991-03-18

1992-01-07

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

429 36, H01M 824

Patent

active

050791044

ABSTRACT:
A fuel cell stack includes a plurality of fuel cells juxtaposed with one another in the stack and each including a pair of plate-shaped anode and cathode electrodes that face one another, and a quantity of liquid electrolyte present at least between the electrodes. A separator plate is interposed between each two successive electrodes of adjacent ones of the fuel cells and is unified therewith into an integral separator plate. Each integral separator plate is provided with a circumferentially complete barrier that prevents flow of shunt currents onto and on an outer peripheral surface of the separator plate. This barrier consists of electrolyte-nonwettable barrier members that are accommodated, prior to the formation of the integral separator plate, in corresponding edge recesses situated at the interfaces between the electrodes and the separator plate proper. Each barrier member extends over the entire length of the associated marginal portion and is flush with the outer periphery of the integral separator plate. This barrier also prevents cell-to-cell migration of any electrolyte that may be present at the outer periphery of the integral separator plate while the latter is incorporated in the fuel cell stack.

REFERENCES:
patent: 4371433 (1983-02-01), Balko et al.
patent: 4588660 (1986-05-01), Shimizu et al.
patent: 4590134 (1986-05-01), Warszawski et al.

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