US 12,074,354 B2
Fuel cell unit cell
Satoshi Nakazawa, Gotemba (JP)
Assigned to Toyota Jidosba Kabushiki Kaisha, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 22, 2021, as Appl. No. 17/208,141.
Claims priority of application No. 2020-085431 (JP), filed on May 14, 2020.
Prior Publication US 2021/0359321 A1, Nov. 18, 2021
Int. Cl. H01M 8/1004 (2016.01); H01M 8/0273 (2016.01); H01M 8/04119 (2016.01)
CPC H01M 8/1004 (2013.01) [H01M 8/0273 (2013.01); H01M 8/04149 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A fuel cell unit cell comprising a membrane electrode assembly and a support frame bonded together by a hot-melt adhesive layer, wherein:
the membrane electrode assembly comprises an electrolyte membrane, a first electrode catalyst layer stacked on a first side of the electrolyte membrane, and a second electrode catalyst layer stacked on a second side of the electrolyte membrane,
the first electrode catalyst layer is stacked inside an outer peripheral side of the electrolyte membrane, and the hot-melt adhesive layer bonds together the outer peripheral sides of the electrolyte membrane and the support frame,
the support frame is disposed in a region separate from the membrane electrode assembly and at the outer periphery of the membrane electrode assembly, and the membrane electrode assembly does not face toward the support frame in a stacking direction of the membrane electrode assembly, and
the hot-melt adhesive layer comprises an ethylene-vinyl alcohol copolymer with an ethylene-derived unit content of 90 to 99 mol %, or a polyamide in which the main chain has 8 to 15 methylene groups for each amide group, or a mixture of the two.