JP2007027014A - Fuel cell stack, separator and unit cell mounting plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separator capable of reducing the size and weight thereof, of balancing rigidity maintenance with stress relaxation, and of providing a fuel cell stack easy to assemble; to provide a unit cell mounting plate; and to provide a fuel cell stack using them. <P>SOLUTION: In this separator 1, a metal thin plate 10 is square, and hollow frames 20 and 20' each forming a square frame-like shape and having the same structure are arranged in edge parts on its front surface and back surface, respectively. A recessed part between the hollow frame 20 and the front surface of the metal plate 10 and a recessed part between the hollow frame 20' and the back surface of the metal thin plate 10' are used for a fuel gas chamber 30 and an air chamber 40, respectively. The hollow frame 20 is composed of: a gas passage part 24 formed with the metal thin plate and equivalent to a side part of the square frame; and a joint part 22 formed with a metal block and equivalent to a corner part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a separator for a fuel cell stack and a single cell mounting plate, and more specifically, a separator capable of realizing a fuel cell stack that can be reduced in size and weight and easy to assemble, a single cell mounting plate, and the like. The present invention relates to a fuel cell stack.

Conventionally, a fuel cell stack includes cells, a cell mounting substrate, a separator, a gas manifold, and the like, and is formed by laminating these components in multiple stages.
In addition, in order to reduce the size and weight of the stack itself, the individual parts are being made thinner and lighter, and further, it is desired to reduce the number of parts in order to simplify the assembly.

In such a background, the fuel electrodes and air electrodes of a single cell are laminated facing each other, a fuel gas channel and an air channel are formed between these electrodes, and the fuel electrodes and the air electrodes are connected to each other. There has been proposed a flat-type solid electrolyte fuel cell in which a separator is unnecessary and the number of parts is reduced by electrical connection to each other (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-045355

However, in recent years, further reduction in size and weight of the fuel cell stack has been desired. In such a conventional fuel cell stack, if the individual components are pursued too much in size and weight, the fuel cell stack In particular, due to the structure that is repeatedly exposed to the thermal history, there is a problem that it is not always sufficient to ensure strength and rigidity.
Moreover, even if the number of components is simply reduced, joining of components may be complicated, and stack assembly is not always simplified.

  The present invention has been made in view of the above-described problems of the prior art. The object of the present invention is to realize a fuel that can be reduced in size and weight, can maintain rigidity and relieve stress, and can be easily assembled. It is an object of the present invention to provide a separator capable of realizing a battery stack, a single cell mounting plate, and a fuel cell stack using these.

  As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by adopting a hollow frame that can handle the joint and the gas flow path unit integrally, The present invention has been completed.

That is, the separator for a fuel cell stack of the present invention includes an airtight flat plate and an airtight hollow frame disposed at the edge of the front and back surfaces of the flat plate, and the flat plates are on the front side and the back side. It is a fuel cell stack separator having a structure that partitions a provided fuel gas chamber and an oxidizing gas chamber.
In this separator, the hollow frame includes a joint portion used for joining with another separator or a single cell mounting plate during stacking, and a fuel gas and an oxidizing gas chamber for the fuel gas and the oxidizing gas, respectively. A gas flow path section for supplying and discharging
The joint portion of the hollow frame has a connection hole that is connected to a gas pipe that extends in the stacking direction and circulates the fuel gas or the oxidizing gas.

  Also, a preferred embodiment of the separator for a fuel cell stack according to the present invention is such that the gas flow path portion has a rigidity lower than that of the joint portion, and is pressed in the opposite direction to the stacking direction during stacking to be crushed and deformed. The length is substantially the same as that of the joint portion.

Furthermore, a single cell mounting plate for a fuel cell stack according to the present invention comprises a flat solid electrolyte and an airtight hollow frame disposed on the edge of the front and back surfaces of the solid electrolyte, the solid electrolyte being A single cell mounting substrate for a fuel cell stack having a structure for partitioning a fuel electrode chamber and an air electrode chamber provided on the front surface side and the back surface side, and disposing a fuel electrode and an air electrode on the front surface and the back surface of the solid electrolyte, respectively. It is.
In the single cell mounting plate, the hollow frame supplies and discharges the fuel gas and the oxidizing gas to the fuel electrode chamber and the air electrode chamber, respectively, to the joint portion used for joining with the separator during stacking. Having a gas flow path,
The joint portion of the hollow frame has a connection hole that is connected to a gas pipe that extends in the stacking direction and circulates the fuel gas or the oxidizing gas.

Furthermore, another unit cell mounting plate for a fuel cell stack according to the present invention comprises a unit cell comprising a solid electrolyte sandwiched between a fuel electrode and an air electrode, and a unit cell for a fuel cell stack comprising a mounting frame for mounting the unit cell. It is a mounting board.
In this single cell mounting plate, the air electrode or fuel electrode of the single cell has a size that can be disposed in the opening of the mounting frame,
The single cell is mounted on the mounting frame so that the air electrode or the fuel electrode is disposed in the opening of the mounting frame, and the solid electrolyte closes the opening.
A part of the mounting frame has a connection hole to which a gas pipe that extends in the stacking direction and circulates the fuel gas or the oxidizing gas is connected.

  Further, the fuel cell stack of the present invention is formed by alternately laminating the separator for a fuel cell stack as described above and a single cell mounting plate for a fuel cell stack, or another single cell mounting plate for another fuel cell stack. Features.

  According to the present invention, a hollow frame capable of integrally handling the joint and the gas flow path is adopted, so that the size and weight can be reduced, both rigidity maintenance and stress relaxation can be achieved, and assembly is easy. It is possible to provide a separator capable of realizing a simple fuel cell stack, a single cell mounting plate, and a fuel cell stack using these.

  Hereinafter, the fuel cell stack separator of the present invention will be described in detail. In the present specification and claims, for convenience of explanation, one surface of a substrate or the like is described as “front surface” and the other surface as “back surface”, but these are functionally equivalent surfaces. In principle, a configuration in which both are replaced is also included in the scope of the present invention.

As described above, the fuel cell stack separator of the present invention includes an airtight flat plate and an airtight hollow frame disposed on both the front and back edges of the flat plate.
The flat plate partitions the fuel gas chamber and the oxidizing gas chamber provided on the front surface side and the back surface side so that the fuel gas in the fuel gas chamber and the oxidizing gas in the oxidizing gas chamber do not mix. ing.

And the above-mentioned hollow frame has a joint part and a gas channel part, and when this joint part forms a fuel cell stack by stacking, it joins with other separators or a single cell mounting board. Used.
In addition, a connecting hole to which a gas pipe is connected is provided at the joint, and the gas pipe extends in the stacking direction, typically in the vertical direction, and is a fuel gas such as hydrocarbon or alcohol or It functions to circulate oxidizing gases such as oxygen and air.
On the other hand, the gas flow path portion functions to supply and discharge the fuel gas from the gas pipe connected to the above-described joining portion to the fuel gas chamber and the oxidizing gas to the oxidizing gas chamber.

In the present invention, typically, the joint portion of the hollow frame and the gas flow path portion are integrally formed, and airtightness is ensured between them.
Therefore, when stacking, if the single cell mounting plate or other separator is joined by the joint, the gas flow path is disposed at the same time. The stacking efficiency can be improved because there is no need to create the file by using the above method.

Further, in the present invention, the rigidity of the gas flow path portion is set lower than the rigidity of the joint portion, and when stacking, it is crushed by pressing in the reverse direction of the stacking direction, typically vertically downward. Is preferably substantially the same as the joint.
This makes it possible to reduce the weight by using a thin-walled gas flow path while satisfying the rigidity required for the fuel cell stack with a joint having a large wall thickness or almost a block (block shape) and high rigidity. Can be planned. For example, the joint portion can withstand the pressing force during stacking and does not deform, and the gas flow path portion can be prevented from being crushed and deformed more than necessary.

The flat plate and the hollow frame described above are not particularly limited as long as they have airtightness and a certain degree of rigidity, but can be formed from a thin metal plate.
As a representative hand, the thickness of the flat plate can be 0.5 to 1 mm, and metal plating such as nickel plating can be performed. On the other hand, the wall thickness of the gas flow path portion can be set to 0.1 to 0.5 mm.

The planar shape of the flat plate described above is not particularly limited, and may be a circular shape, an elliptical shape, a triangular shape, or other polygonal shapes. However, from the space efficiency of the stack, that is, the volume of the space actually occupied by the stack. A square or rectangular shape can be preferably used.
When a flat plate having a polygonal shape, particularly a regular polygon such as a square, is used, it is preferable to arrange the joints at the corners in order to maintain good stack rigidity. The shape of the hollow frame is also particularly limited. Although it is not performed, it is preferable that the shape is the same as or approximate to the shape of the flat plate.

Next, the single cell mounting plate for a fuel cell stack according to the present invention will be described.
As described above, the single cell mounting plate for a fuel cell stack according to the present invention includes a flat solid electrolyte substrate and an airtight hollow frame disposed on the front and back edges of the solid electrolyte. However, it has the structure approximated to the separator for fuel cell stacks of the present invention described above.

That is, the single cell mounting plate of the present invention has a configuration in which the airtight flat plate in the separator of the present invention is replaced with a single cell having a configuration in which the solid electrolyte substrate is sandwiched between the fuel electrode and the air electrode, Description of the shape of the single cell (plate) and the hollow frame will be omitted.
In this single cell mounting plate, since the fuel electrode and the air electrode have air permeability (porosity), while the solid electrolyte substrate has air tightness, the fuel electrode chamber and the air electrode chamber provided on the front surface side and the back surface side Is partitioned in a state in which airtightness is maintained.

  In the single cell mounting plate of the present invention, the solid electrolyte material is not particularly limited, and yttria stabilized zirconium (YSZ), scandia stabilized zirconium (ScSZ), and gadolinium-added ceria can be used. The fuel electrode material is nickel-yttria stabilized zirconium (YSZ) cermet material, nickel-samarium-added ceria cermet material, and the air electrode material is lanthanum / strontium / manganese oxide, lanthanum / calcium / manganese oxide. And lanthanum / cobalt oxide can be used.

Next, another single cell mounting plate of the present invention will be described.
As described above, another single cell mounting plate of the present invention includes a single cell in which a solid electrolyte is sandwiched between a fuel electrode and an air electrode, and a mounting frame on which the single cell is mounted.
The single cell is the same as above, but the air electrode or the fuel electrode has a size that can be disposed in the opening of the mounting frame, and the air electrode or the fuel electrode is disposed in the opening of the mounting frame. Yes.
That is, when the cross section is observed, one of the air electrode and the fuel electrode has a configuration that enters the opening of the mounting frame.

However, in this single cell mounting plate, the single cell is mounted on the mounting frame so that the solid electrolyte closes the opening in order to perform an airtight section between the fuel electrode chamber and the air electrode chamber. Yes.
Further, a part of the mounting frame is provided with a connection hole that is connected to a gas pipe that extends in the stacking direction and circulates the fuel gas or the oxidizing gas.
When other stack elements such as separators and single cell mounting plates are polygons, particularly regular polygons, these single cells (plates) and mounting frames also form corresponding regular polygons, and gas is provided at the corners. It is desirable that a pipe connection hole is provided.

In the other single cell mounting plate of the present invention, the mounting frame can mount the plate-shaped single cell, and the fuel electrode or the air electrode is exposed on one side, and the air electrode or the fuel electrode on the other side ( It is sufficient to expose a substrate having a polarity opposite to that of the one side.
Therefore, unlike the single cell mounting plate of the present invention described above, this mounting frame does not have to be hollow.

Next, the fuel cell stack of the present invention will be described.
The fuel cell stack of the present invention comprises the above-described separator for the fuel cell stack of the present invention and the single cell mounting plate for the fuel cell stack of the present invention or the other single cell mounting plate for the fuel cell stack of the present invention alternately. It is characterized by being laminated.
That is, this fuel cell stack typically has a structure in which the separator of the present invention and the single cell mounting plate of the present invention (single cell mounting plate A) are alternately laminated, or the separator of the present invention and the other of the present invention. The single cell mounting plate (single cell mounting plate B) is alternately stacked. However, if the alternate stacking of the separator and the single cell mounting plate can be secured, the single cell mounting plate A and the single cell mounting plate B are provided. You may use together.

  In the fuel cell stack of the present invention, since the separator and the single cell mounting plate have the functions as described above, the size and weight are reduced, and both rigidity maintenance and stress relaxation are achieved. It is excellent in durability even if it undergoes a thermal history that passes through the above, and further, assembly (stacking) can be easily performed.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

Example 1
[Separator]
FIG. 1 is a perspective view, a plan view, and a bottom view showing an embodiment of a separator for a fuel cell stack according to the present invention. FIG. 1 (X) is a perspective view of the separator, (Y) is a plan view, and (Z) is a plan view. It is a bottom view.
In these figures, in this separator 1, a thin metal plate 10, which is an example of an airtight flat plate, has a square shape and is nickel-plated, and the edges on the front and back surfaces are identical in a square frame shape. A hollow frame 20 and 20 'of the construction is arranged respectively.

  In this separator 1, a recess defined by the hollow frame 20 and the surface of the thin metal plate 10 is provided in the fuel gas chamber 30 (see FIG. 1 (Y)), and the back surface of the hollow frame 20 ′ and the thin metal plate 10 ′. Are provided in an air chamber 40 which is an example of an oxidizing gas chamber (see FIG. 1 (Z)).

In this embodiment, the hollow frame 20 includes a gas flow path portion 24 formed of a thin metal plate and corresponding to a side portion of a square frame, and a joint portion 22 formed of a metal block and corresponding to a corner portion. The same applies to the hollow frame 20 ′.
The gas flow path section 24 is used to supply / discharge fuel gas to / from the fuel gas chamber 30 and supply / discharge air to / from the air chamber 40. The joint section 22 is a single cell mounting plate, for example, a single cell shown in FIG. When stacking with the mounting plate 2, it is used for joining and fixing of both.

As described above, since the gas flow path portion 24 is formed of a thin metal plate, the separator 1 is lightweight, and since the joint portion 22 is formed of a metal block, an appropriate rigidity is also maintained. .
Therefore, the fuel cell stack formed by using this separator has a sufficient rigidity while being lightweight as a whole, and has a stress relaxation property due to a difference in rigidity between the gas flow path portion 24 and the joint portion 22. Also have.

  As shown in FIGS. 2 and 3, the separator 1 is formed so that the height of the gas flow path portion 24 is higher than the height of the joint portion 22 before stacking (before stacking). The part 24 is pressed vertically downward during stacking to be crushed and deformed, and has almost the same height as the joint part 22.

Next, the flow of fuel gas and air in the separator will be described.
First, as shown by the arrow F, the fuel gas is supplied from a gas pipe (not shown) connected to the connection hole 26f of the joint portion 22 and flows into the gas flow path portion 24, and further the gas flow The gas flows into the fuel gas chamber 30 from the gas hole 24 h formed in the passage portion 24.
Thereafter, the fuel gas is discharged from the fuel gas chamber 30 through the gas holes drilled in the opposing gas flow path portions, and is connected to the opposing gas flow path portions and the connecting holes 27f (not shown). .) Is supplied to a single cell mounting plate and other separators (not shown) (see FIGS. 1X, 1Y, and 1Z).

On the other hand, as with the fuel gas, air also flows from the gas pipe (not shown) connected to the connecting hole 26a into the gas flow passage 24 'and further into the air chamber 40, as indicated by the arrow A. After that, the gas is discharged from the opposing gas flow path portion and supplied to a single cell mounting plate or other separator (not shown) via a gas pipe (not shown) connected to the connecting hole 27a (see FIG. 1). .)
As described above, in the separator of this embodiment, the fuel gas flow F and the air flow A circulate on the front surface side and the back surface side of the thin metal plate 10, respectively, but their flow directions are orthogonal to each other. In other words, they are three-dimensionally orthogonal.

(Example 2)
[Single cell mounting plate]
FIG. 4 is a perspective view, a plan view, and a bottom view showing an embodiment of the single cell mounting plate (single cell mounting plate A) of the present invention. Hereinafter, members that are substantially the same as those described above are given the same reference numerals, and descriptions thereof are omitted.
This single cell mounting plate 2 is a separator of Example 1 except that it includes a plate-shaped single cell having a structure in which a solid electrolyte substrate 12 is sandwiched between a fuel electrode layer 32 and an air electrode layer 42 instead of the metal thin plate 10. 1 has substantially the same structure.

The section in which the fuel electrode chamber 34 and the air electrode chamber 44 are kept airtight is realized by the solid electrolyte substrate 12 having airtightness.
The flow of the fuel gas F and air A is the same as that of the separator 1.
Since this single cell mounting plate 2 also has a gas flow path portion 24 that is light and has relatively low rigidity, and a joint portion 22 that has relatively high rigidity, the fuel cell stack formed using this separator is light in weight as a whole. However, it has sufficient rigidity and also has stress relaxation properties due to the difference in rigidity between the gas flow path portion 24 and the joint portion 22.

(Example 3)
[Single cell mounting plate]
FIG. 5 is a plan view and a bottom view showing another embodiment of the single cell mounting plate (single cell mounting plate A) of the present invention.
As shown in the figure, in this single cell mounting plate, a cover layer 36 provided with an exposed hole 36r in the fuel electrode layer 32 and a cover layer 46 provided with an exposed hole 46r in the air electrode layer 42 are installed. The fuel electrode layer 32 and the air electrode layer 42 are partially exposed by the exposure holes 36r and 46r, respectively.
By providing such an exposure hole, the effect of robust installation can be obtained when the cell is installed.

Example 4
[Fuel cell stack]
FIG. 6 is a cross-sectional view schematically showing one embodiment of the fuel cell stack of the present invention.
The fuel cell stack of the present example is obtained by alternately laminating the separators 1 of the first example and the single cell mounting plates 2 of the second example.
Stacking (stacking) can be performed by simple operations by stacking the separators 1 and the single cell mounting plates 2 alternately, and then pressing them vertically downward with the pressing tool 100 having a structure like a multiple tube. .

  In the fuel cell stack of this embodiment obtained by such a simple operation, the separator 1 and the single cell mounting plate 2 each have excellent lightness, rigidity, and stress relaxation properties. It has excellent resistance to heat history and repeated vibration due to repeated high and low temperatures, excellent durability, and stable over a long period of time. Power generation is possible.

(Example 5)
[Other single cell mounting plates]
FIG. 7 is a perspective view and a cross-sectional view showing one embodiment of another single cell mounting plate (single cell mounting plate B) for the fuel cell stack of the present invention.
In this figure, the single cell mounting plate 3 uses a solid square frame 200 having gas pipe connection holes at corners, and an air electrode layer 42 is accommodated in the opening of the frame 200. The solid electrolyte 12 has a structure that closes the opening.
In this example, the fuel electrode substrate 32 is formed to be relatively thick, thereby ensuring the rigidity of the single cell.

(Example 6)
[Fuel cell stack using other single cell mounting plate]
FIG. 8 is a perspective view showing another embodiment of the fuel cell stack of the present invention, and FIG. 9 is a cross-sectional view of this fuel cell stack.
In these figures, this fuel cell stack is configured by alternately laminating separators 1 of Example 1 and single cell mounting plates 3 of Example 5, and gas extending vertically in the corners. A tube 50 is provided.

Similarly to the fuel cell stack of the fourth embodiment, stacking can be performed simply by stacking the separators 1 and the single cell mounting plates 3 alternately and pressing them vertically downward.
In addition, this fuel cell stack can also exhibit excellent lightness, rigidity, and stress relaxation, and has excellent resistance to thermal history and repeated vibration due to repeated high and low temperatures, making it durable. It is excellent and enables stable power generation over a long period of time.

Although the present invention has been described in more detail than some preferred embodiments, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the gist of the present invention.
For example, if the frame 200 of the single cell mounting plate 3 is made hollow, the lightness can be further improved.
Further, as the fuel cell stack, a stacked structure of the separator 1, the single cell mounting plate 2, the separator 1 and the single cell mounting plate 3 is also prepared.

It is a perspective view, a plane, and a bottom view showing one example of a separator for fuel cell stacks of the present invention. It is sectional drawing by the AA line and BB line before lamination | stacking of the separator for fuel cell stacks shown in FIG. FIG. 2 is a partial perspective view of the fuel cell stack separator shown in FIG. 1 before lamination. It is a perspective view, a plane, and a bottom view showing one example of a single cell mounting board of the present invention. It is the top view and bottom view which show the other Example of the single cell mounting plate of this invention. It is sectional drawing which shows simply one Example of the fuel cell stack of this invention. It is the perspective view and sectional drawing which show one Example of the other single cell mounting plate for fuel cell stacks of this invention. It is a perspective view which shows one Example of the other fuel cell stack of this invention. It is sectional drawing of the fuel cell stack shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Separator 2,3 Single cell mounting plate 10 Metal thin plate 12 Solid electrolyte 20 Hollow frame 22 Joint part 24 Gas flow path part 24h Gas hole 30 Fuel gas chamber 32 Fuel electrode layer 34 Fuel electrode chamber 36 Cover layer 36r Exposed hole 40 Air chamber 42 Air electrode layer 44 Air electrode chamber 46 Cover layer 46r Exposed hole 50 Gas pipe 100 Pressing tool 200 Frame A Air flow F Fuel gas flow

Claims (13)

An airtight flat plate and an airtight hollow frame disposed on the front and back edges of the flat plate, and a fuel gas chamber and an oxidizing gas chamber provided on the front side and the back side of the flat plate. A separator for a fuel cell stack having a partitioning structure,
The hollow frame supplies and discharges a fuel gas and an oxidizing gas to the fuel gas chamber and the oxidizing gas chamber, respectively, to a joint portion used for joining with another separator or a single cell mounting plate during stacking. A gas flow path section
The joining part of the said hollow frame has a connection hole to which the gas pipe which extends in a stacking direction and distribute | circulates fuel gas or oxidizing gas is connected, The separator for fuel cell stacks characterized by the above-mentioned.   The gas flow path portion is lower in rigidity than the joint portion, and is pressed in a direction opposite to the stacking direction during stacking to be crushed and deformed, and the height thereof is substantially the same as the joint portion. The fuel cell stack separator according to claim 1.   The flat plate forms a rectangular plate or a square plate, the hollow frame has a rectangular or square frame shape, the gas flow path portion of the hollow frame is arranged on a side portion of the rectangular or square, and the joint portion is The separator for a fuel cell stack according to claim 1 or 2, wherein the separator for a fuel cell stack is arranged at a corner portion.   Gas for supplying and discharging fuel gas and oxidizing gas to and from the fuel gas chamber and oxidizing gas chamber, respectively, between a pair of gas flow paths corresponding to opposite sides in the rectangular or square hollow frame The fuel cell stack separator according to claim 3, wherein holes are provided.   5. The fuel cell stack separator according to claim 4, wherein gas flow directions in the fuel gas chamber and the oxidizing gas chamber defined by the gas holes are substantially orthogonal in three dimensions. A fuel cell and an air electrode chamber each having a flat solid electrolyte and an airtight hollow frame disposed on the front and back edges of the solid electrolyte, the solid electrolyte being provided on the front side and the back side And a single cell mounting substrate for a fuel cell stack, in which a fuel electrode and an air electrode are respectively disposed on the front and back surfaces of the solid electrolyte,
The hollow frame has a joint portion used for joining to the separator during stacking, and a gas flow path portion that supplies and discharges fuel gas and oxidizing gas to the fuel electrode chamber and the air electrode chamber, respectively. ,
The single-cell mounting plate for a fuel cell stack, wherein the joint portion of the hollow frame has a connection hole to which a gas pipe that extends in the stacking direction and circulates a fuel gas or an oxidizing gas is connected.   The gas flow path portion is lower in rigidity than the joint portion, and is pressed in a direction opposite to the stacking direction during stacking to be crushed and deformed, and the height thereof is substantially the same as the joint portion. The single cell mounting plate for a fuel cell stack according to claim 6.   The solid electrolyte forms a rectangular plate or a square plate, the hollow frame has a rectangular or square frame shape, the gas flow path portion of the hollow frame is arranged on a side portion of the rectangular or square, and the joint portion is The single cell mounting plate for a fuel cell stack according to claim 6 or 7, wherein the single cell mounting plate is arranged at a corner portion thereof.   In the rectangular or square frame-shaped hollow frame, gas holes for supplying and discharging fuel gas and oxidizing gas to and from the fuel electrode chamber and the air electrode chamber, respectively, between a pair of gas flow paths corresponding to opposing sides The single cell mounting plate for a fuel cell stack according to claim 8, wherein:   The single cell mounting for a fuel cell stack according to claim 9, wherein the gas flow directions in the fuel electrode chamber and the air electrode chamber defined by the gas holes are substantially orthogonal in three dimensions. Board. A single cell mounting plate for a fuel cell stack comprising a single cell in which a solid electrolyte is sandwiched between a fuel electrode and an air electrode, and a mounting frame for mounting the single cell,
The air electrode or fuel electrode of the single cell has a size that can be disposed in the opening of the mounting frame,
The single cell is mounted on the mounting frame so that the air electrode or the fuel electrode is disposed in the opening of the mounting frame, and the solid electrolyte closes the opening.
A single cell mounting plate for a fuel cell stack, characterized in that a part of the mounting frame has a connection hole to which a gas pipe extending in the stacking direction and flowing a fuel gas or an oxidizing gas is connected.   12. The single cell mounting plate for a fuel cell stack according to claim 11, wherein the mounting frame has a rectangular or square frame shape, and the connection holes are arranged at corners of the rectangle or square.   The fuel cell stack separator according to any one of claims 1 to 5, and the single cell mounting plate for a fuel cell stack according to any one of claims 6 to 10, or claim 11 or claim. Item 13. A fuel cell stack, wherein the fuel cell stack unit cell mounting plates according to Item 12 are alternately stacked.

Images