US 11,658,313 B2
Separator assembly for fuel cell and fuel cell stack including same
Seong Il Heo, Gyeonggi-Do (KR); Yoo Chang Yang, Gyeonggi-do (KR); and Byeong-Heon Jeong, Gyeonggi-do (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Motors Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Motors Corporation, Seoul (KR)
Filed on Apr. 3, 2019, as Appl. No. 16/373,980.
Claims priority of application No. 10-2018-0156386 (KR), filed on Dec. 6, 2018.
Prior Publication US 2020/0185730 A1, Jun. 11, 2020
Int. Cl. H01M 8/0247 (2016.01); H01M 8/0276 (2016.01)
CPC H01M 8/0247 (2013.01) [H01M 8/0276 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A fuel cell stack formed by stacking multiple unit cells, the fuel cell stack comprising:
the multiple unit cells each comprised of a membrane electrode assembly having a sub-gasket provided on each side thereof, a pair of gas diffusion layers, an anode separator, and a cathode separator,
wherein the anode separator and the cathode separator constituting adjacent cells are arranged to face each other and joined together to be integrated with each other,
the anode separator has a protruding bead seal providing a seal, and
the cathode separator has an arched bulge protruding in the same direction as the bead seal at a location corresponding to a location where the bead seal is formed, wherein an upper surface of a central side of the arched bulge is located above both end surfaces of the cathode separator;
wherein a gasket is provided on a concave surface of the bulge of the cathode separator at the location where the bulge is formed, the concave surface being opposite to a convex surface of the bulge;
a sealing agent is applied to a convex surface of the bead seal of the anode separator at the location where the bead seal is formed, wherein the bulge formed at the cathode separator protrudes in a direction opposite to the sub-gasket abutting the bulge and is sealed by the gasket in tight contact with the sub-gasket;
in a region where air flows, the cathode separator and the anode separator are spaced apart from each other at a location outside the bulge around an upstream side of an air flow path with respect to a direction in which air flows, while the cathode separator and the anode separator are joined together by a junction at a location outside the bulge around a downstream side of the air flow path with respect to the direction in which air flows; and
the cathode separator is holed at the location outside the bulge around the downstream side of the air flow path with respect to the direction in which air flows, thus forming a through hole passing through first and second surfaces of the cathode separator and allowing air that flows between the cathode separator and the anode separator to flow between the cathode separator and the sub-gasket; and
wherein the through hole is configured to pass through a portion of the cathode separator directly facing the sub-gasket.