| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to suppress pressure loss in a piping pipe as much as possible and to circulate fluid smoothly and uniformly.SOLUTION: A fuel cell stack 10 includes: a plurality of fuel cells 12 that are stacked; a first end plate 18a disposed at one end in a stacking direction; and an oxidant gas-supplying coupling piping pipe 54a attached thereto while being communicated to an oxidant gas-supplying coupling hole 32a. The oxidant gas-supplying coupling piping pipe 54a includes a piping pipe intermediate portion 70 whose opening cross sectional area is set at a value larger than an opening cross sectional area of an oxidant gas outlet 68, and the piping pipe intermediate portion 70 includes a swollen part 72 that is swollen toward a direction opposite to an oxidant gas inlet 66 from an opening range in a plan view of the oxidant gas outlet 68. |
