| 摘要 |
A redox fuel cell stack (1) comprises a plurality of essentially similar half-cell frames (2,3) of moulded polymer. Interleaved between them are semi-permeable membranes (4) and bipolar plate electrodes. The frames (2, 3) are rectangular, with margins (11) around central voids (12). At the voids, they have rebates (14) in abutting faces (15) for locating the plate electrodes. At their corners, they have apertures (17) for forming ducts throughout the stack for flow of electrolyte to and from the cell cavities provided by the voids (12). The frames (2) have electrolyte flow passages (18) open in their faces 15 abutting the frames 3 and leading towards each other. The passages stop short of each other and are surrounded by grooves containing sealing O-rings (20). Diagonally opposite ones of the passages (18) end at openings (22) passing through the frames (2). The other passages have no openings in the frames (2), but the frames (3) have openings through them in register with the ends of the passages. On the other side of the frames (2) and (3), the openings (21,22) open into short passages (23) directed towards the central voids and debouching into electrolyte distribution rebates (24). Thus electrolyte can flow from one duct aperture (17) in one corner, via the passage (18) from the aperture, either through the frame (2) via the opening (21) or the frame (3) via the opening (22), through short passage (23) and the respective distribution rebate and into the central void to whichever side of the plate electrode it was directed by the opening (21, 22). From the opposite end of the central void, the electrolyte is lead back into the diagonally opposite duct aperture. |
