Fuel-cell separator and cell stack

A separator for a fuel cell, wherein a corrosion-resistant layer is formed on at least one face of a metal plate and a fluid supply and diffusion layer is formed by a porous layer on said corrosion-resistant layer.

A separator for coolant in a fuel cell, wherein a corrosion-resistant layer is formed on at least one face of a metal plate, a dense frame is formed on the periphery of said corrosion-resistant layer, equalization layers are formed within said dense frame in the vicinity of respective ones of a coolant supply port and discharge port over the entire width of said dense frame, and coolant flow paths are formed between said equalization layers by ribs or layers of a porous material.

A cell stack for a fuel cell which includes separators of at least two types for a cathode gas and an anode gas;

• wherein each separator is such that a fluid supply and diffusion layer for a corresponding gas is formed by a porous layer on at least one face of a metal plate;
• an equalization layer extending in a direction that intersects a direction from a fluid supply side to a fluid discharge side is formed on said fluid supply and diffusion layer, as a part thereof, on at least the fluid supply side;
• and the at least two separators are stacked so as to face each other with at least an electrolyte membrane and catalyst layers on both sides of said membrane being sandwiched between said fluid supply and diffusion layers.

A cell stack for a fuel cell which includes separators of at least two types for a cathode gas and an anode gas;

• wherein each separator is such that a corrosion-resistant layer is formed on at least one face of a metal plate, a fluid supply and diffusion layer for a corresponding gas is formed by a porous layer on said corrosion-resistant layer, and the at least two separators are stacked so as to face each other with at least an electrolyte membrane and catalyst layers on both sides of said membrane being sandwiched between the fluid supply and diffusion layers.