| 摘要 |
The invention relates to a fuel cell stack, whereby a regulation of the operational medium concentration may be effected by simple means. It is thus possible to automatically operate the fuel cell stack almost optimally, which means just above the minimum necessary operating medium concentration for operation, dependant upon the load. The invention is based upon the effect that an individual fuel cell under identical operating conditions produces a lesser cell voltage. The above is used as the adjustment parameter for the controlled addition of at least one operating medium, for example methanol or also air. According o the invention, the fuel cell stack can thus be operated with economical means at nearly optimal conditions. |
