JPH0513090A - Solid electrolyte fuel cell - Google Patents

Abstract

PURPOSE:To provide a solid electrolyte fuel cell having the capability of easily forming a serial connection body, and restraining a voltage drop. CONSTITUTION:A solid electrolyte fuel cell in the title is constituted of a cylindrical fuel electrode 1, a solid electrolyte film 2 formed on the surface of the electrode 1, and an air electrode 3 formed on the surface of the film 2. In addition, a negative electrode current collector 6 is fitted to the surface of the fuel electrode 1. Also, a fuel introduction tube 7 comprising conductive metal or conductive ceramic is inserted in the cell, and connected to the negative electrode current collector 6. The conductive metal or ceramic acts to restrain a voltage drop. When a grouped cell is constituted of the solid electrolyte fuel cell, it becomes easy to constitute the serial connection body thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolyte fuel cell, and more particularly to a structure of a solid electrolyte fuel cell capable of easily increasing the voltage.

[0002]

2. Description of the Related Art Solid electrolyte fuel cells include phosphoric acid fuel cells, flat-plate fuel cells having a structure similar to molten carbonate fuel cells, monolithic fuel cells proposed by Argonne National Laboratory in the United States, and Japanese electronic technology comprehensive. The cylindrical multi-element type being developed by the laboratory and the cylindrical single-element type proposed by Westinghouse, Inc. in the United States are known, but at the present time, Westin is easy to gas seal at high temperature and easy to construct a stack. Guhouse's cylindrical single element type is receiving attention.

In such a solid electrolyte fuel cell, as shown in FIG.
As shown in FIG.
It is known that the interconnector portion 21 is provided and is connected to the outer electrode 32 of another battery to increase the voltage.

On the other hand, a current collector for the inner electrode is provided in the cylindrical tubular opening, and a current collector for the outer electrode is provided at the other end to connect the same poles to each other to form an assembled battery. It is also known that the device is connected to the device to increase the voltage.

[0005]

The provision of the interconnector portion 21 as shown in FIG. 4 not only complicates the structure of the battery but also causes the leakage of fuel and air. It was

Further, when the current collector of the inner electrode is provided in the cylindrical tubular opening, the current collecting path from the inner electrode 11 becomes long and the voltage drops. .

[0007]

In order to solve the above problems, the present invention provides a cylindrical tubular fuel electrode, a solid electrolyte membrane provided on the surface of the fuel electrode, and a solid electrolyte membrane provided on the surface of the solid electrolyte membrane. And an air electrode on the surface of the air electrode,
An air introducing pipe having a positive electrode current collector attached thereto is provided, and a negative electrode current collector is provided on the surface of the fuel electrode, and a fuel introducing pipe made of a conductive metal or a conductive ceramics is inserted thereinto. The fuel introducing pipe is connected to the negative electrode current collector.

[0008]

As described above, according to the present invention, since the fuel introducing pipe made of conductive metal or conductive ceramics is inserted inside the fuel electrode, the voltage drop in the current collecting path of the fuel electrode can be reduced. it can.

Further, when the fuel introducing pipe is made of conductive ceramics, the internal reforming reaction can be promoted by its catalytic action and the conversion efficiency can be enhanced.

[0010]

EXAMPLE FIG. 1 is a sectional view of a solid electrolyte fuel cell of the present invention.

FIG. 2 is a block diagram of an assembled battery constituted by the solid electrolyte fuel cell.

FIG. 3 is a perspective view of a series connection body of the assembled battery.

As shown in FIG. 1, the present invention is characterized in that a cylindrical tubular fuel electrode 1, a solid electrolyte membrane 2 provided on the surface of the fuel electrode 1, and a surface of the solid electrolyte membrane 2 are provided. An air electrode 3, and a positive electrode current collector 4 on the surface of the air electrode 3.
Is provided, and a negative electrode current collector 6 is provided on the surface of the fuel electrode 1, and a fuel introduction pipe 7 is inserted therein, and the fuel introduction pipe 7 is connected to the negative electrode current collector. 6 is connected.

By filling the inside of the fuel electrode 1 with the web 15 made of a conductive metal such as nickel or stainless, it is possible to suppress a decrease in voltage and improve the characteristics.

If the fuel introducing pipe 7 is made of a conductive metal such as nickel or stainless, it is possible to suppress the voltage drop, and if it is made of a conductive ceramic such as nickel-zirconia cermet or cobalt-zirconia cermet. The internal reforming reaction can be promoted by its catalytic action.

The positive electrode current collectors 4 are connected to each other and the negative electrode current collectors 6 are connected to each other, and the positive electrode current collector 4 side is an air chamber 8 and the negative electrode current collector 6 side is a fuel chamber 9. It is housed in the case 10 to form an assembled battery.

The air chamber 8 and the fuel chamber 9 are insulated from each other by an insulating insulator 20, the air chamber 8 is provided with an air inlet 81 and an air outlet 82, and the fuel chamber 9 is provided with a fuel inlet 91. And a fuel outlet 92 are provided.

The assembled battery thus obtained is heated from an operating temperature of 700 ° C. to 1000 ° C., air is supplied to the air chamber 8 and fuel is supplied to the fuel chamber 9, and the air chamber 8 and the fuel chamber 9 are separated from each other. When connected to an external circuit, an electromotive force is generated by the internal reforming reaction with the air chamber 8 as a positive electrode and the fuel chamber 9 as a negative electrode, thereby acting as a battery.

The series connection body of the assembled battery as described above is shown in FIG.
As described above, the fuel chamber and the air chamber of each assembled cell are brought into contact with each other to be laminated, and the air inlets 81, the air outlets 82, the fuel inlets 91, and the fuel outlets 92 are externally connected to each other. can do.

[0020]

As described above, according to the present invention, it is possible to easily obtain a high voltage and to obtain a solid electrolyte fuel cell capable of suppressing a decrease in voltage.

[Brief description of drawings]

FIG. 1 is a sectional view of a solid oxide fuel cell of the present invention.

FIG. 2 is a configuration diagram of an assembled battery configured by the solid electrolyte fuel cell of FIG.

FIG. 3 is a perspective view of a series connection body of the assembled battery of FIG.

FIG. 4 is a cross-sectional view of a series-connected body of a conventional solid oxide fuel cell.

[Explanation of symbols]

1 fuel pole 2 Solid electrolyte membrane 3 air electrode 4 Positive electrode current collector 5 Air introduction pipe 6 Negative electrode current collector 7 Fuel introduction pipe 8 air chambers 9 Fuel chamber 10 battery case 15 Web 20 Insulator for insulation

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[Procedure amendment]

[Submission date] August 19, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (4)

[Claims] 1. A cylindrical tubular fuel electrode, a solid electrolyte membrane provided on the surface of the fuel electrode, and an air electrode provided on the surface of the solid electrolyte membrane, the surface of the air electrode comprising:
An air introducing pipe having a positive electrode current collector attached thereto is provided, and a negative electrode current collector is provided on the surface of the fuel electrode, and a fuel introducing pipe made of a conductive metal or a conductive ceramics is inserted thereinto. A solid electrolyte fuel cell in which a fuel introduction pipe is connected to the negative electrode current collector. 2. The solid electrolyte fuel cell according to claim 1, wherein the inside of the fuel electrode is filled with a web made of a conductive metal. 3. The solid electrolyte fuel cell according to claim 1 or 2, wherein the conductive metal is nickel or stainless steel. 4. The solid electrolyte fuel cell according to claim 1, wherein the conductive ceramics is nickel-zirconia cermet or cobalt-zirconia cermet.