Fuel cell separator and fuel cell of solid polymer type

摘要

Fuel cell separators having on one side or both sides thereof channels for gas supply and discharge, which channels are formed from compositions composed mainly of thermosetting resin and graphite particles. The compositions are designed to have a flexural modulus of at most 20 GPa and a flexural strength of at least 50 MPa (both measured according to JIS K6911). Also disclosed is a solid polymer type fuel cell system in which part or all of its separators are fuel cell separators as defined above. Due to its high strength and low flexural modulus, the fuel cell separators of the invention do not break as a result of deformation at the time of fuel cell assembly. Moreover, the fuel cell separators of the invention absorb shocks and vibration imparted to the fuel cell system. Therefore, they is useful for automobile fuel cells which are normally subject to vibrations and shocks during operation.