| 摘要 |
The invention relates to a stack of solid oxide fuel cells, of which each cell exhibits a metal bearing structure, which exhibits passage orifices for a gas and is intended for a cathode--electrolyte-anode unit, and a bipolar plate, which is provided on the other side of the bearing structure, or the like. The bearing structure is made of a metal, which forms a protective oxide layer, which is electrically insulating, and operates as an electric resistance heating element for adjusting the fuel cell temperature, to which end an electric current may be guided through the bearing structure between its protective oxide layers. An electrically conductive material is introduced in at least some of the passage orifices of the bearing structure for the purpose of providing an electric connection between the bipolar plate or the like; and the associated cathode-electrolyte-anode unit is introduced in such a way that the gas can pass through these passage orifices. Preferably the metal of the bearing structure is an aluminum oxide former or a silicon oxide former. To generate the electric conductivity in the area of the passage orifices, a gas permeable and electrically conductive material, for example, in the form of a suitably treated metal, may be introduced into said orifices; or an electrically conductive coating may be applied on the protective oxide layer of the bearing structure at least in the area of some of the passage orifices. |
