| US 7,615,306 B2 | ||
| Membrane electrode assembly for a fuel cell | ||
| Stefan Haufe, Goettingen (Germany); Annette Reiche, Goettingen (Germany); Suzana Kiel, Goettingen (Germany); Ulrich Maehr, Berlin (Germany); and Dieter Melzner, Goettingen (Germany) | ||
| Assigned to Elcomax Membranes GmbH, Munich (Germany) | ||
| Filed on Nov. 29, 2006, as Appl. No. 11/605,464. | ||
| Application 11/605464 is a continuation of application No. PCT/EP2005/006025, filed on Jun. 04, 2005. | ||
| Claims priority of application No. 10 2004 028 141 (DE), filed on Jun. 10, 2004. | ||
| Prior Publication US 2007/0072045 A1, Mar. 29, 2007 | ||
| Int. Cl. H01M 2/08 (2006.01); H01M 8/10 (2006.01) | ||
| U.S. Cl. 429—35 [429/33] | 15 Claims |
| 9. A fuel cell stack, comprising a plurality of membrane electrode units which are each disposed between separator plates,
wherein each membrane electrode unit comprises a planar polymer membrane which, in a tangentially inner area, is coated with
respective electrode structures on either side and which has a tangentially outer area projecting beyond the electrode structure
coating,
wherein a marginal zone of each polymer membrane is embedded into and forms a bond with a sealing member formed of an elastomer
material, and the sealing member extends tangentially inwardly into a transition area that lies tangentially between the outer
area and the inner area, where the sealing member overlaps the electrode structures on outer faces of the electrode structures,
on both of the sides of the polymer membrane, and
wherein the inner areas of the plurality of polymer membranes and the respective transition areas are doped with a doping
agent, such that the concentration of the doping agent decreases tangentially outwardly in the transition areas.
|