Interconnector-electrochemical reaction single cell composite body, and electrochemical reaction cell stack

Patent metadata

Field	Value
Publication number	US-2018323446-A1
Application number	US-201615769016-A
Country	US
Kind code	A1
Filing date	Oct 13, 2016
Priority date	Oct 23, 2015
Publication date	Nov 8, 2018
Grant date	—

Abstract

An interconnector-electrochemical reaction unit cell composite body including an electrochemical reaction unit cell, and an interconnector which has a first through hole defining a fuel gas flow channel and which is disposed on the side toward an anode of the electrochemical reaction unit cell. The interconnector includes a coating forming a first surface of the interconnector opposite the anode. The coating includes a first coating and a second coating a having reduction resistance higher than that of the first coating. The first coating forms a first surface region which is a portion of the first surface of the interconnector and which is located away from the first through hole. The second coating forms a second surface region which is a portion of the first surface of the interconnector, which surrounds the first through hole, and which is located between the first coating and the first through hole.

First claim

1 . An interconnector-electrochemical reaction unit cell composite body comprising:
an electrochemical reaction unit cell including an electrolyte layer, and a cathode and an anode which face each other in a first direction with the electrolyte layer intervening therebetween; and an interconnector which has a first through hole defining a fuel gas flow channel and which is disposed on the anode side of the electrochemical reaction unit cell, the interconnector-electrochemical reaction unit cell composite body being characterized in that the interconnector includes a coating forming a first surface of the interconnector, the first surface being located on a side of the interconnector opposite the anode; and the coating includes a first coating and a second coating having reduction resistance higher than that of the first coating, the first coating forming a first surface region which is a portion of the first surface of the interconnector and is located away from the first through hole, the second coating forming a second surface region which is a portion of the first surface of the interconnector, surrounds the first through hole, and is located between the first coating and the first through hole.

2 . An interconnector-electrochemical reaction unit cell composite body according to claim 1 , wherein the interconnector has a second through hole defining an oxidizer gas flow channel, and the first surface region includes a surface region surrounding the second through hole.

3 . An interconnector-electrochemical reaction unit cell composite body according to claim 1 , wherein the second coating contains chromia.

4 . An interconnector-electrochemical reaction unit cell composite body according to claim 1 , wherein the electrolyte is formed of a solid oxide.

5 . An electrochemical reaction cell stack comprising:
a plurality of interconnector-electrochemical reaction unit cell composite bodies disposed in a first direction; and a sealing member which forms a fuel gas flow channel and which is disposed between the interconnector of one of two adjacent interconnector-electrochemical reaction unit cell composite bodies among the plurality of interconnector-electrochemical reaction unit cell composite bodies and the other interconnector-electrochemical reaction unit cell composite body, the electrochemical reaction cell stack being characterized in that: at least one of the interconnector-electrochemical reaction unit cell composite bodies is an interconnector-electrochemical reaction unit cell composite body as recited in claim 1 ; and the outer peripheral contour of the second coating is located inward of the outer peripheral contour of the sealing member as viewed in the first direction.

6 . An electrochemical reaction cell stack according to claim 5 , wherein the inner peripheral contour of the first coating is located outward of the inner peripheral contour of the sealing member as viewed in the first direction.

7 . An electrochemical reaction cell stack comprising:
a plurality of interconnector-electrochemical reaction unit cell composite bodies disposed in a first direction; and a sealing member which forms a fuel gas flow channel and which is disposed between the interconnector of one of two adjacent interconnector-electrochemical reaction unit cell composite bodies among the plurality of interconnector-electrochemical reaction unit cell composite bodies and the other interconnector-electrochemical reaction unit cell composite body, the electrochemical reaction cell stack being characterized in that: at least one of the interconnector-electrochemical reaction unit cell composite bodies is an interconnector-electrochemical reaction unit cell composite body as recited in claim 1 ; and the inner peripheral contour of the first coating is located outward of the inner peripheral contour of the sealing member as viewed in the first direction.

8 . An electrochemical reaction cell stack according to claim 1 , wherein the electrochemical reaction unit cell included in each of the interconnector-electrochemical reaction unit cell composite bodies is a fuel cell unit cell.

Assignees

• Ngk Spark Plug Co

Inventors

• Tanimura Ryoji
• Murase Masaaki

Classifications

• H01M8/2432

  Grouping of unit cells of planar configuration · CPC title

• H01M8/12

  operating at high temperature, e.g. with stabilised ZrO2 electrolyte · CPC title

• H01M8/021

  Alloys based on iron · CPC title

• H01M8/0271 Primary

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

• H01M8/2425

  High-temperature cells with solid electrolytes · CPC title