| 摘要 |
PURPOSE:To reliably prevent gas leakage so as to increase the life of a fuel cell by improving the elasticity and the contact between the end section of the rib electrode and the gas-separating plate by interposing between them a layer of kneaded sealing material containing a thermoresistant electrolyte-resistant fluorine resin powder. CONSTITUTION:A layer of a kneaded sealing material 6 composed of 40-60wt% a thermoresistant electrolyte-resistant fluorine resin powder, 60-40wt% fluorine oil and 1.5-4wt% a silicon carbide powder is interposed between the end section of a rib electrode 2 and a gas-separating plate 3. It is formed according to the following procedure during assembly of a fuel cell. After a fluorine resin film 4 is stuck to the end section of each rib electrode 2 having a matrix, the kneaded sealing material 6 is extruded upon the film 4 and then is rolled using a small roller. After that, a gas-separating plate 3 is placed over the material 6 and then a downward pressure is applied to the plate 3 to bring the rib electrode 2 and the plate 3 into close contact with each other. Due to the sealing material layer, the elasticity and the contact between the rib electrode 2 and the gas-separating plate 3 are improved and therefore no gas leaks from between the electrode 2 and the plate 3 even after repeated cycles of heating and cooling. Consequently, it is possible to produce a fuel cell with a remarkably long life. |
