Fuel cell and method for production thereof

Patent metadata

Field	Value
Publication number	US-9680163-B2
Application number	US-66896308-A
Country	US
Kind code	B2
Filing date	May 6, 2008
Priority date	Jul 26, 2007
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A fuel cell ( 1 ) has a plate ( 2 ) produced by powder metallurgy which comprises in one piece a porous substrate area ( 4 ) to which the electrochemically active cell layers ( 6 ) are applied, and a gastight edge area ( 5 ) which is provided with gas passages ( 17, 18 ).

First claim

The invention claimed is:

1. A solid oxide fuel cell having a one-pieced plate ( 2 ) the entirety of which is produced by powder metallurgy, wherein the plate has a central area ( 4 ) and an edge area ( 5 ) made of the same material, wherein there is a continuous and seamless transition between the edge area ( 5 ) and the central area ( 4 ), wherein the central area is a porous substrate to which an electrochemically active cell layer ( 6 ) is applied, and wherein gas passages ( 17 , 18 ) are provided in the edge area ( 5 ), and wherein the edge area ( 5 ) is compressed to be gastight, and wherein a gastight connection is made between the plate ( 2 ) and an interconnector ( 3 ) along the edge area ( 5 ) of the plate and along a circumference of the interconnector, and wherein the composition of one-pieced plate consists of:
15 to 35 wt % Cr;
0.01 to 2 wt % of one or more elements selected from the group consisting of Ti, Zr, Hf, Mn, Y, Sc, and rare earth metals;
0 to 10 wt % of one or more elements selected from the group consisting of Mo and Al;
0 to 5 wt % of one or more elements selected from the group consisting of Ni, W, Nb, and Ta;
0.1 to 1 wt % O; and
balance Fe and impurities, whereby at least one metal of the group Y, Sc, rare earth metals and at least one metal of the group Cr, Ti, Al, Mn can form a mixed oxide.

2. The fuel cell according to claim 1 , characterized in that an electrolyte layer ( 8 ) of the electrochemically active cell layer ( 6 ) borders gastightly on the gastight edge area ( 5 ) of the plate ( 2 ).

3. The fuel cell according to claim 1 characterized in that the electrochemically active cell layer ( 6 ) includes an electrolyte layer ( 8 ), wherein at least a portion of the total circumference of the electrolyte layer extends over the compressed edge area ( 5 ) of the plate ( 2 ).

4. A fuel cell stack comprising a multiplicity of fuel cells ( 1 ) according to claim 1 .

5. A fuel cell comprising a plate ( 2 ) and an interconnector ( 3 );
wherein the plate ( 2 ) is a one-pieced plate produced entirely by powder metallurgy and has a central area ( 4 ) and an edge area ( 5 ) made of the same material, wherein the central area is a porous substrate to which an electrochemically active cell layer ( 6 ) is applied, and wherein gas passages ( 17 , 18 ) are provided in the edge area ( 5 ), and wherein the edge area ( 5 ) is compressed to be gastight; and
wherein a gastight connection is made between the plate ( 2 ) and the interconnector ( 3 ) along the edge area ( 5 ) of the plate and along a circumference of the interconnector; and
wherein there is a continuous, seamless transition between the edge area ( 5 ) and the central area ( 4 ), and wherein the composition of one-pieced plate consists of:
15 to 35 wt % Cr;
0.01 to 2 wt % of one or more elements selected from the group consisting of Ti, Zr, Hf, Mn, Y, Sc, and rare earth metals;
0 to 10 wt % of one or more elements selected from the group consisting of Mo and Al;
0 to 5 wt % of one or more elements selected from the group consisting of Ni, W, Nb, and Ta;
0.1 to 1 wt % O; and
balance Fe and impurities, whereby at least one metal of the group Y, Sc, rare earth metals and at least one metal of the group Cr, Ti, Al, Mn can form a mixed oxide.

6. A fuel cell having a one-pieced plate ( 2 ), wherein the plate has a central area ( 4 ) and an edge area ( 5 ), wherein the central area is a porous substrate to which an electrochemically active cell layer ( 6 ) is applied, and wherein gas passages ( 17 , 18 ) are provided in the edge area ( 5 ), wherein the edge area ( 5 ) is compressed to be gastight, wherein there is a continuous, seamless transition between the edge area ( 5 ) and the central area ( 4 ), and wherein the one-pieced plate ( 2 ) is formed by a powder metallurgy process comprising:
producing a planar, porous body by powder metallurgy;
compressing to the point of airtightness the body edge area of the planar, porous body to form the edge area ( 5 ) of the one-pieced plate ( 2 ), the remainder of the planar, porous body becoming the central area ( 4 ) of the one-pieced plate ( 2 ); and
providing gas passages through the edge area ( 5 ), and wherein the composition of one-pieced plate consists of:
15 to 35 wt % Cr;
0.01 to 2 wt % of one or more elements selected from the group consisting of Ti, Zr, Hf, Mn, Y, Sc, and rare earth metals;
0 to 10 wt % of one or more elements selected from the group consisting of Mo and Al;
0 to 5 wt % of one or more elements selected from the group consisting of Ni, W, Nb, and Ta;
0.1 to 1 wt % O; and
balance Fe and impurities, whereby at least one metal of the group Y, Sc, rare earth metals and at least one metal of the group Cr, Ti, Al, Mn can form a mixed oxide.

7. The fuel cell according to claim 6 , wherein the planar, porous body is formed from a powder having a particle size of less than 150 μm.

8. The fuel cell according to claim 6 , wherein the planar, porous body has a porosity of 20% to 60%.

9. The fuel cell according to claim 6 , wherein the compression of the body edge area is effected by uniaxial pressing or rolling.

Assignees

• Brandner Marco
• Franco Thomas
• Kunschert Georg
• Zach Reinhold
• Zobl Gebhard
• Plansee Se

Inventors

• Brandner Marco
• Franco Thomas
• Kunschert Georg
• Zach Reinhold
• Zobl Gebhard

Classifications

• Y02P70/56

  Cross-Sectional Technologies · mapped topic

• H01M8/0202 Primary

  Collectors; Separators, e.g. bipolar separators; Interconnectors · CPC title

• H01M8/0232

  Metals or alloys · CPC title

• H01M8/0247 Primary

  characterised by the form (characterised by a channel configuration H01M8/0258) · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title