Patent ID: 8518601

Claim:
A gas separator for a fuel cell, which is assembled by lamination of the gas separator, an electrolyte layer, and electrode layers arranged across the electrolyte layer, the gas separator comprising: a first plate that forms one face of the gas separator; a second plate that forms the other face of the gas separator; a third plate that is located between the first plate and the second plate and has a cooling medium flow path forming hole, which is pierced in a thickness direction of the third plate to define a cooling medium flow path for flow of a cooling medium between the first plate and the second plate, wherein the cooling medium flow path-forming hole overlaps a part of the electrolyte layer and the electrode layers in lamination; and a flow rate regulator that is provided in the cooling medium flow path defined by the cooling medium flow path-forming hole, the flow rate regulator regulates a flow rate of the cooling medium flowing in the cooling medium flow path to have a higher flow rate of the cooling medium in a higher temperature area in a temperature distribution in a plane of the gas separator during power generation of the fuel cell, wherein the temperature distribution is determined according to at least either of an operating condition of the fuel cell and an environment surrounding the fuel cell, wherein: the flow rate regulator has multiple protrusions, which are formed on at least one of the first plate and the second plate to be protruded into the cooling medium flow path and to be arranged and distributed in a two-dimensional manner in the entire cooling medium flow path, the multiple protrusions being provided to be away from one another such that the higher temperature area of the temperature distribution has a higher formation density, and the flow rate regulator is configured to decrease a substantial sectional flow area of the cooling medium flow path in the higher temperature area of the temperature distribution.