초록 ▼

A liquid-cooled, bipolar plate separating adjacent cells of a PEM fuel cell comprising corrosion-resistant metal sheets brazed together so as to provide a passage between the sheets through which a dielectric coolant flows. The brazement comprises a metal which is substantially insoluble in the cool

A liquid-cooled, bipolar plate separating adjacent cells of a PEM fuel cell comprising corrosion-resistant metal sheets brazed together so as to provide a passage between the sheets through which a dielectric coolant flows. The brazement comprises a metal which is substantially insoluble in the coolant.

대표청구항 ▼

[ I claim:] [1.] A liquid-cooled, bipolar plate for separating adjacent first and second cells of a PEM fuel cell and for conducting electric current between said cells, said plate comprising: (1) a first corrosion-resistant metal sheet having an anode-confronting face comprising a plurality of firs

[ I claim:] [1.] A liquid-cooled, bipolar plate for separating adjacent first and second cells of a PEM fuel cell and for conducting electric current between said cells, said plate comprising: (1) a first corrosion-resistant metal sheet having an anode-confronting face comprising a plurality of first lands defining a plurality of first grooves for distributing hydrogen to said first cell, and a first heat exchange face; (2) a second corrosion-resistant metal sheet having a cathode-confronting face comprising a plurality of second lands defining a plurality of second grooves for distributing oxygen to said second cell, and a second heat exchange face; and (3) said first and second heat exchange faces (a) confronting each other so as to define therebetween a coolant flow passage adapted to receive a substantially dielectric liquid coolant, and (b) being electrically coupled to each other at a plurality of oxide-free sites via a brazement having a melting temperature less than the melting temperature of said sheets, said brazement being selected from metals which are so insoluble in said coolant as not to contaminate said coolant with metal ions which diminish the dielectric character of said coolant.