Metal separator, fuel cell, and method of producing metal separator

A fuel cell comprising a metal separator stacked on each of both surfaces of a membrane electrode assembly, the membrane electrode assembly including an electrolyte membrane and electrodes provided on both surfaces of the electrolyte membrane,

• wherein the metal separator comprises:
• a metal plate including a fluid passage configured to allow fluid to flow in a stacking direction, the metal plate forming a fluid flow field configured to allow the fluid to flow along a separator surface;
• and
• a plurality of rubber extension parts adhered to the metal plate, and extending from the fluid passage toward the fluid flow field,
• wherein, between the plurality of rubber extension parts, a metal surface of the metal plate is exposed, and a channel configured to connect the fluid passage and the fluid flow field is formed, and
• the plurality of rubber extension parts are adhered to the metal plate through a plurality of dot primers between the metal plate and the rubber extension parts.

A method of producing a metal separator stacked on each of both surfaces of a membrane electrode assembly to form a fuel cell, the membrane electrode assembly including an electrolyte membrane and electrodes provided on both surfaces of the electrolyte membrane,

• the method comprising:
• a metal plate processing step of producing a metal plate including a fluid passage configured to allow fluid to flow in a stacking direction, the metal plate forming a fluid flow field configured to allow the fluid to flow along a separator surface;
• and
• a rubber adding step of providing, on the metal plate, a plurality of rubber extension parts extending from the fluid passage toward the fluid flow field,
• wherein, between the plurality of rubber extension parts, a metal surface of the metal plate is exposed, and a channel configured to connect the fluid passage and the fluid flow field is formed, and
• in the rubber adding step, the plurality of rubber extension parts are adhered to the metal plate through a plurality of dot primers.