US 9,812,724 B2
Preventing migration of liquid electrolyte out of a fuel cell
Sridhar V. Kanuri, Milford, CT (US); Richard D Breault, North Kingstown, RI (US); Kishore Kumar Tenneti, Vernon, CT (US); and Ned E. Cipollini, Enfield, CT (US)
Assigned to DOOSAN FUEL CELL AMERICA, INC., South Windsor, CT (US)
Appl. No. 13/142,099
Filed by Sridhar V. Kanuri, Milford, CT (US); Richard D Breault, North Kingstown, RI (US); Kishore Kumar Tenneti, Vernon, CT (US); and Ned E. Cipollini, Enfield, CT (US)
PCT Filed Jun. 18, 2009, PCT No. PCT/US2009/003658
§ 371(c)(1), (2), (4) Date Jun. 24, 2011,
PCT Pub. No. WO2010/123479, PCT Pub. Date Oct. 28, 2010.
Claims priority of provisional application 61/214,130, filed on Apr. 20, 2009.
Prior Publication US 2012/0028160 A1, Feb. 2, 2012
Int. Cl. H01M 8/04 (2016.01); H01M 8/086 (2016.01); H01M 8/0284 (2016.01); H01M 8/0286 (2016.01); H01M 8/0228 (2016.01)
CPC H01M 8/086 (2013.01) [H01M 8/0284 (2013.01); H01M 8/0286 (2013.01); H01M 8/0228 (2013.01); Y02P 70/56 (2015.11)] 34 Claims
OG exemplary drawing
 
1. A stack of fuel cells for generating electrical current from streams of hydrogen-containing reducing fluid and oxygen-containing oxidant reactant, comprising:
a plurality of cathode electrodes;
a plurality of anode electrodes;
a plurality of matrix plates holding a liquid acid electrolyte, each matrix plate being between one of the cathode electrodes and one of the anode electrodes;
a plurality of separator plate assemblies, each separator plate assembly having a separator plate secured in contact with and between one of the cathode electrodes and one of the anode electrodes, each separator plate defining a first flow field adjacent a first contact surface of the separator plate, the first flow field including at least one first flow channel extending inwardly from the first contact surface of the separator plate, the first flow channel being configured to direct a corresponding one of the streams adjacent a selected one of the electrodes, each separator plate having outside edges that are perpendicular to the first contact surface, the outside edges of the separator plates being aligned with outside edges of the cathode electrodes and outside edges of the anode electrodes, each separator plate comprising a land region extending along the first contact surface between the at least one first flow channel and an adjacent one of the edges of the separator plate, the land region extending parallel to the at least one flow channel; and
an acid migration barrier to inhibit acid migration, the barrier comprising a film that is distinct from the material of the separator plate, the barrier being secured to the land region of the separator plate and extending away from and outwardly beyond the adjacent one of the outside edges of the separator plate and the outside edge of an adjacent one of the electrodes in a direction away from the at least one first flow channel,
wherein each matrix plate is between the one of the cathode electrodes and the one of the anode electrodes without any acid migration barrier between the matrix plate and said electrodes.