High-temperature fuel cell system and method for the production of contacting elements for such a fuel cell system
View Patent ↗Disclosed is a high-temperature fuel cell system including individual SOFC fuel cells which are in contact with each other to be electrically connected in parallel or in series. Contacting elements are provided, in at least one embodiment, that are suitable for the fuel cell system with a certain flexibility in addition to electrical conductivity for continuous operation. The contacting elements are provided, in at least one embodiment, between two fuel cells with an outer, metallically conductive jacket and a ceramic core. For example, ceramic felts can be enveloped by a nickel net by adequately shaping the same.
1. A high-temperature fuel-cell system, comprising:
a plurality of individual fuel cells; and
at least one flexible contact-making element to electrically connect the fuel cells with one another at least one of in parallel and in series, the at least one flexible contact-making element including a ceramic core and a sleeve of a metallic conductive material around the ceramic core,
wherein the metallic conductive material is in the form of at least one of a mesh and a knitted fabric.
2. The high-temperature fuel-cell system as claimed in claim 1 , wherein the at least one flexible contact-making element conducts electrons, is thermally stable and is gas-permeable.
3. The high-temperature fuel-cell system as claimed in claim 1 , wherein the ceramic core is a felt.
4. The high-temperature fuel-cell system as claimed in claim 1 , wherein the ceramic core is a mesh.
5. The high-temperature fuel-cell system as claimed in claim 1 , wherein the ceramic core is a knitted fabric.
6. The high-temperature fuel-cell system as claimed in claim 1 , wherein the ceramic core is a cord.
7. The high-temperature fuel-cell system as claimed in claim 3 , wherein the felt is composed of ceramic fibers and at least one additive.
8. The high-temperature fuel-cell system as claimed in claim 1 wherein the metallic conductive sleeve is in the form of the mesh, and the mesh is composed of at least one of nickel and a nickel alloy.
9. The high-temperature fuel-cell system as claimed in claim 1 , wherein the metallic conductive sleeve is in the form of the knitted fabric, and the knitted fabric is composed of at least one of nickel and a nickel alloy.
10. The high-temperature fuel-cell system as claimed in claim 8 , wherein the nickel alloy is a two-component alloy that includes a primary and a secondary metallic component, or a multiple-component alloy that includes the primary metallic component and a plurality of secondary metallic components.
11. The high-temperature fuel-cell system as claimed in claim 10 , wherein the secondary metallic component or the plurality of secondary metallic components is at least one element from the group consisting of copper, chromium, cobalt, and titanium.
12. The high-temperature fuel-cell system as claimed in claim 10 , wherein the secondary metallic component of the two-component alloy is ≦30% by weight of the nickel alloy, or
the plurality of secondary metallic components of the multiple-component alloy are, collectively, ≦30% by weight of the nickel alloy.
13. The high-temperature fuel-cell system as claimed in claim 1 , wherein the knitted fabric has a porosity of >80%, with a wire thickness of between 50 μm and 150 μm.
14. The high-temperature fuel-cell system as claimed in claim 4 , wherein the mesh of the ceramic core is composed of ceramic fibers and at least one additive.
15. The high-temperature fuel-cell system as claimed in claim 5 , wherein the knitted fabric of the ceramic core is composed of ceramic fibers and at least one additive.
16. The high-temperature fuel-cell system as claimed in claim 6 , wherein the cord of the ceramic core is composed of ceramic fibers and at least one additive.
17. The high-temperature fuel-cell system as claimed in claim 2 , wherein the metallic conductive sleeve is in the form of the mesh, and the mesh is composed of at least one of nickel and a nickel alloy.
18. The high-temperature fuel-cell system as claimed in claim 2 , wherein the metallic conductive sleeve is in the form of the knitted fabric, and the knitted fabric is composed of at least one of nickel and a nickel alloy.
19. The high-temperature fuel-cell system as claimed in claim 9 , wherein the nickel alloy is a two-component alloy that includes a primary and a secondary metallic component, or a multiple-component alloy that includes the primary metallic component and a plurality of secondary metallic components.
20. The high-temperature fuel-cell system as claimed in claim 1 , wherein the sleeve of the metallic conductive material is coaxially around the ceramic core.