Fuel cell separator and fuel cell including same

A fuel cell separator formed to have a plate shape, comprising a reactant gas flow region which is formed on at least one main surface of the fuel cell separator, includes a plurality of groove-like straight portions and one or more turn portions, and is formed to have a bent shape and through which a reactant gas flows, wherein:

• first rib portions are formed among the plurality of straight portions;
• the plurality of straight portion are formed such that the plurality of first rib portions are formed;
• the turn portion is formed so as to connect an upstream straight portion that is the straight portion located upstream of the turn portion and a downstream straight portion that is the straight portion located downstream of the turn portion and is formed such that the reactant gas flows from the upstream straight portion therethrough to the downstream straight portion;
• at least one of the one or more turn portions includes a gas mixing portion, a gas meeting portion through which the reactant gas from the upstream straight portion flows to the gas mixing portion, and a gas separating portion through which the reactant gas from the gas mixing portion flows to the downstream straight portion;
• the gas mixing portion includes a depressed portion and a plurality of protruding portions configured to protrude from a bottom surface of the depressed portion;
• second rib portions are formed in the gas meeting portion and the gas separating portion, base ends of the second rib portions being connected to the first rib portions, the second rib portions being configured to extend from the first rib portions;
• when the first rib portion formed between the upstream straight portion and the downstream straight portion adjacent to each other is defined as a center rib portion, and a virtual line passing through a width-direction center of the center rib portion and extending in a direction in which the center rib portion extends is defined as a center line,
• the second rib portions are formed such that regarding two adjacent second rib portions, the length of the second rib portion located closer to the center rib portion is shorter than the length of the second rib portion located farther from the center rib portion in a direction in which the second rib portions extend, and
• an outermost second rib portion is formed so as to be bent inward toward the center line when viewed from a thickness direction of the fuel cell separator, the outermost second rib portion being the second rib portion formed in at least one of the gas meeting portion and the gas separating portion and being the second rib portion located farthest from the center rib portion;
• and
• at least one of the second rib portions other than the outermost second rib portion is formed so as not to be bent.