Patent ID: 8557466
Filing Date: 2013-10-15
Classification: H01M,Y02E

Abstract:
1. An internal humidifying fuel cell comprising a polymer electrolyte membrane, a membrane electrode assembly having a pair of catalyst electrodes sandwiching the polymer electrolyte membrane therebetween, and a separator having a gas flow channel for supplying a fuel gas or oxidizing gas to the membrane electrode assembly, wherein the gas flow channel is a forward and return channel having an S-shaped or spiral pattern, an upstream flow channel of the gas flow channel is adjacent to a downstream flow channel of the gas flow channel, and the gas flowing through the forward flow channel, including the upstream flow channel, is in an opposite direction to the gas flowing through the return flow channel, including the downstream flow channel, a wall of the gas flow channel is impermeable to the fuel gas or oxidizing gas, and a spacing between the upstream flow channel and the downstream flow channel of the gas flow channel is from 2.2 mm to 3.3 mm and is from 2 to 3 times the width of the gas flow channel.