Fuel cell and fuel cell stack
In a solid polymer electrolyte membrane type fuel cell of the invention, where a pair of electrodes are provided on opposite sides of a solid polymer electrolyte membrane, and the outside thereof is clamped by a pair of separators, and nonconductive picture frame-shaped members 61 are arranged at the outer edge portions of the separators, for allowing increase and decrease of a space between separators, while sealing a gap between the separators.
1. A fuel cell comprising:
a pair of separators sandwiching a pair of electrodes provided on both sides of a solid polymer electrolyte membrane; and
insulating picture frame-shaped members attached to an outer edge of each of the separators for allowing increase and decrease of a space between the separators during movement of the separators while the space between adjacent separators is sealed by said picture frame-shaped members,
wherein each of said picture frame-shaped members includes an elastic material and is disposed on both sides of each of said separators.
2. A fuel cell according to claim 1 , wherein a first of the picture frame-shaped members being attached to one of the separators is constituted so as to be able to slide relative to a second of the picture frame-shaped members being attached to the other separator and seal said space between the separators.
3. A fuel cell according to claim 1 , wherein said separators are made of a metal, and at least one of said picture frame-shaped members is formed of a hard material and an elastic material.
4. A fuel cell according to claim 1 , wherein at least one of said picture frame-shaped members has a separator positioning device.
5. A fuel cell stack formed by stacking a plurality of unit fuel cells according to claim 1 , wherein a peripheral end surface of each of said separators is covered by each of said picture frame-shaped members.
6. A fuel cell according to claim 1 , further comprising peripheral sealing members each of which surrounds a corrugated portion of each of said separators.
7. A fuel cell according to claim 6 , further comprising an insulating outer edge member for covering a surface of one of the separators outside of one of said peripheral sealing members wherein said insulating outer edge member is integrally formed with said peripheral sealing member.
8. A fuel cell according to claim 6 wherein a first of the peripheral sealing members of a respective separator is formed in a flat shape, and a second of the peripheral sealing members of an adjacent separator which faces to said flat peripheral sealing member is formed so as to protrude.