| 摘要 |
PROBLEM TO BE SOLVED: To allow for enhancement in drainage of produced water while miniaturizing in the lamination direction.SOLUTION: A power generation unit 12 constituting a fuel cell stack 10 is provided with a first metal separator 14, a first electrolyte membrane/electrode structure 16a, a second metal separator 18, a second electrolyte membrane/electrode structure 16b, and a third metal separator 20. On the surface 18a of the second metal separator 18, an overlap part 34ei overlapping a first resin frame member 58 in the lamination direction is provided at the inlet side passage end of a first fuel gas passage 34. The passage depth d1 of the overlap part 34ei is shallower than the passage depth d2 of a wavy passage groove 34a in the passage central part. |
