Electrically insulating gasket for SOC unit

Patent metadata

Field	Value
Publication number	US-10205179-B2
Application number	US-201515122479-A
Country	US
Kind code	B2
Filing date	Mar 30, 2015
Priority date	Apr 4, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A sandwiched gasket is used for an SOC stack system to provide flexible, yet electrically insulation properties to the sealing between mounting interfaces of the system.

First claim

The invention claimed is:

1. Solid oxide cell stack system comprising:
a plurality of stacked cell units and mounting interfaces, the mounting interfaces comprising at least one gasket, wherein said gasket comprises a sandwich structure comprising a first layer, a second layer, and a third layer, the first and third layers being formed of a flexible gasket material which is more flexible than the second layer and which compensates for vibrations, surface defects of the mounting interfaces and thermally originated movements, the second layer comprising an electrically insulating layer having a flexural strength between 140 and 250 N/mm 2 positioned in between the first and the third layer, wherein holes are made in the second layer, to provide fixation of the first, second and third layers relative to each other.

2. Solid oxide cell stack system according to claim 1 , wherein the first layer, the second layer, and the third layer are made of mica.

3. Solid oxide cell stack system according to claim 1 , wherein the tensile strength of the second layer is between 60 and 180 N/mm 2 .

4. Solid oxide cell stack system according to claim 1 , wherein the compressive strength at 200° C. of the second layer is between 180 and 300 N/mm 2 .

5. Solid oxide cell stack system according to claim 1 , wherein the flexural strength of the second layer is between 140 and 200 N/mm 2 .

6. Solid oxide cell stack system according to claim 1 , wherein the thickness of each of the first, second and third layer is between 0.2 mm and 15 mm.

7. Solid oxide cell stack system according to claim 1 , wherein indentations or bulges are made in at least one of the first layer, the second layer, and the third layer, to provide fixation of the layers relative to each other.

8. Solid oxide cell stack system according to claim 1 , wherein indentations, holes or bulges are made on at least one of the mounting interfaces which are in contact with the gasket to provide fixation of the gasket relative to the contacting mounting interfaces.

9. Solid oxide cell stack system according to claim 1 , wherein an adhesive is applied between the three layers.

10. Solid oxide cell stack system according to claim 1 , wherein said gasket is mounted between the cell stack and a process gas manifold.

11. Process for assembling a solid oxide cell stack system comprising a plurality of stacked cell units and a plurality of mounting interfaces and comprising at least one sandwich structured gasket comprising a first layer, a second layer, and a third layer to be located between two mounting interfaces, the process comprising the steps of:
manufacturing the first layer and the third layer of the gasket of a flexible gasket material which is more flexible than the second layer of the gasket, and which compensates for vibrations, surface defects of the mounting interfaces and thermally originated movements to physically match said mounting interfaces,
manufacturing the second layer from an electrically insulating material to physically match said two mounting interfaces and the first and the second layers, said second layer having a flexural strength between 140 and 250 N/mm 2 and being less flexible than either said first or third layers, wherein holes are made in the second layer, to provide fixation of the first, second and third layers relative to each other,
assembling the first, second and third layers with the second gasket layer sandwiched between the first and the third layer,
positioning the assembled gasket on one of the two mounting interfaces,
mounting the other of the two mounting interfaces, and
applying compression to the gasket between the two mounting interfaces.

12. Process according to claim 11 , wherein adhesive is applied to at least two surfaces of the first layer, the second layer, and the third layer before assembling of the first layer, the second layer, and the third layer.

13. Process according to claim 11 , wherein indentations are made in at least one of the first layer, the second layer, and the third layer, to provide fixation of the layers relative to each other.

14. Process according to claim 11 , wherein indentations, holes or bulges are made on at least one of the mounting interfaces which are in contact with the gasket to provide fixation of the gasket relative to the contacting mounting interfaces.

15. Process according to claim 11 , wherein the first layer, the second layer, and the third layer are made of mica.

Assignees

• Haldor Topsoe As

Inventors

• Kiilstofte Hansen Lars
• Klitholm Cliver Søren
• Heiredal-Clausen Thomas
• Erikstrup Niels
• Refslund Nielsen Martin

Classifications

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/10 Primary

  Fuel cells with solid electrolytes · CPC title

• H01M8/0271

  Sealing or supporting means around electrodes, matrices or membranes · CPC title

• H01M8/04089

  of gaseous reactants · CPC title

• H01M8/2425

  High-temperature cells with solid electrolytes · CPC title