Separator and fuel cell

Abstract

A separator has a recess-projection shape formed by press working. The separator has one surface as a gas circulation surface and an opposite surface as a cooling surface, the gas circulation surface having a reactive gas flow path including a plurality of reactive gas flow path grooves resulting from the recess-projection shape, the cooling surface having a cooling water flow path including a plurality of cooling water flow path grooves resulting from the recess-projection shape. The cooling water flow path includes an intersection flow path portion including cooling water flow path grooves adjacent to each other with a reactive gas flow path groove of the reactive gas flow path therebetween, and a communication flow path groove formed at the cooling surface side of the reactive gas flow path groove between the adjacent cooling water flow path grooves, the communication flow path groove being shallower than the cooling water flow path grooves; and a cooling water turn portion where a direction of the cooling water flow path grooves changes. A reactive gas turn portion is formed at the gas circulation surface in a position on the rear side of the cooling water turn portion, and the reactive gas turn portion is formed of a groove portion having a constant depth.