Patent ID: 9698432
Date: 2017-07-04
CPC Classifications: H01M,Y02E

Claim:
1. A manufacture comprising a fuel cell, said fuel cell comprising: first, second and third membrane-electrode assemblies, each membrane electrode assembly comprising an anode and a cathode; and a first bipolar metal plate interposed between and in contact with said first and second membrane-electrode assemblies and a second bipolar metal plate interposed between and in contact with said second and third membrane-electrode assemblies, wherein each of said first and second bipolar metal plates comprises two metal sheets fixedly attached to each other by welds; wherein the two metal sheets of each of the first and second bipolar metal plates comprise successive guiding channels for guiding gas, each guiding channel demarcated by a bottom, the guiding channels of each metal sheet extending in a common longitudinal direction and distributed in a transversal direction, wherein the two metal sheets of each of the first and second bipolar metal plates are in contact along the bottoms of their respective guiding channels and joined by said welds, wherein said welds comprise welds of said first bipolar metal plate and welds of said second bipolar metal plate, wherein at least a part of said welds of said first bipolar metal plate are not superimposed on said welds of said second bipolar metal plate and are offset longitudinally and transversally relative to said welds of said second bipolar metal plate; wherein the first bipolar metal plate and the second bipolar metal plate conduct electric current and are in an active area of the fuel cell at which protons are produced, thus making available electrons for forming electric current, and wherein the welds of said first bipolar metal plate and the welds of said second bipolar metal plate are in the active area of the fuel cell.