Patent ID: 7758991

Claim:
A fuel cell formed by stacking an electrolyte electrode assembly and a metal separator in a stacking direction, said electrolyte electrode assembly including a pair of electrodes and an electrolyte interposed between said electrodes, a fluid flow field for supplying a fluid comprising at least one of a fuel gas, an oxygen-containing gas, and a coolant along a surface of said metal separator, and a fluid passage for supplying the fluid in the stacking direction, being formed in said fuel cell, said fuel cell comprising: a rubber wall member provided on said metal separator, said rubber wall member disposed between said fluid flow field and said fluid passage to divide said fluid flow field and said fluid passage; said rubber wall member having: a channel disposed between said fluid flow field and said fluid passage to allow flow of said fluid between said fluid flow field and said fluid passage; one or more grooves formed by a cutout in the stacking direction, said one or more grooves disposed adjacent to said channel and extending along said channel; and one or more partitions disposed within each of said one or more grooves, said one or more partitions closing at least part of each of said one or more grooves to prevent flow of said fluid between said fluid flow field and said fluid passage.