| 摘要 |
A seal structure for impregnating the circumferential edge of a GDL constituting an MEA with a rubber composing a seal lip line in which lowering in power generation capacity is suppressed by controlling the width of a rubber impregnation region for the circumferential edge of the GDL appropriately, thereby preventing the MEA reaction region from becoming narrow. In order to achieve the purpose, an MEA ( 2 ) arranged between a pair of separators ( 5 ), a rubber sheet ( 6 ) arranged on its planar extension on the outer circumferential side of the MEA ( 2 ), and a gasket-like lip line ( 7 ) formed on the opposite sides of the rubber sheet ( 6 ) integrally therewith to be close contact with the separators ( 5 ) are provided. At the circumferential edge of the MEA ( 2 ), a rubber impregnated portion ( 8 ) for integrating the rubber sheet ( 6 ) with the MEA ( 2 ) when the GDL ( 4 ) constituting the MEA ( 2 ) is impregnated with a part of the rubber composing the rubber sheet ( 6 ) is provided. On the immediately inner circumferential side of the rubber impregnated portion ( 8 ) in the plane of the MEA ( 2 ), a GDL constricted portion ( 9 ) for regulating the rubber impregnated portion is provided.
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