| 摘要 |
The invention concerns a PEM fuel cell stack consisting of one or more fuel cells (1) arranged on top of one another, each of which contains a membrane electrode assembly (2) between two electrically conductive bipolar plates (3,4), the surfaces o f which are equipped with flow channels (10) open on one side for the supply of reactive gases, whereby the membrane electrode assemblies each comprise a polymer electrolyt e membrane (5), both sides of which are in contact with a reaction layer (6,7) , whereby the surface area of the reaction layers is smaller than that of the polymer electrolyte membrane and a compressible, coarse-pore gas distribution layer (8,9) made from carbon fibre fabric is inserted between each reaction layer and the adjacent bipolar plates congruent to the reaction layers along with seals (11,12) in the area outside the surface covered by the gas distribution layers, whereby the gas distribution layers in the no-load condition display a thickness D1 and the seals a thickness D2. The P EM fuel cell stack is characterised in that the gas distribution layers in the PEM fuel cell stack are compressed to 25 to 60% of their original thickness. |
