Patent ID: 7842411

Claim:
A separator for a fuel cell stack, comprising: a plate having a first opening and a second opening on a surface thereof; a field formed on the surface of the plate, the field having a first end and a second end; a field inlet formed on the surface of the plate and connecting the first end of the field to the first opening; and a field outlet formed on the surface of the plate and connecting the second end of the field to the second opening, an area of a cross-section of the field inlet at an interface between the first opening and the field inlet being smaller than an area of a cross-section of the field outlet at a planar interface between the second opening and the field outlet, an area of a cross-section of the first end of the field at an interface between the first end of the field and the field inlet being greater than an area of a cross-section of the field inlet at the planar interface between the first end of the field and the field inlet.