JP5801735B2 - Fuel cell and fuel cell stack - Google Patents

Description

  The present invention provides a fuel battery cell in which two electrode surfaces are provided on both upper and lower surfaces of an electrolyte, and a reaction gas is supplied to each electrode surface to generate electric power, and a fuel cell stack formed by stacking a plurality of the fuel battery cells. About.

Current fuel cells are roughly classified according to the material of the electrolyte, solid polymer type (PEFC) using a polymer electrolyte membrane as electrolyte, phosphoric acid type (PAFC) using phosphoric acid as an electrolyte, and Li-Na / K. There are four types, a molten carbonate type (MCFC) using an electrolyte based on carbonate and a solid oxide type (SOFC) using an electrolyte based on ZrO ₂ for example. Each type has a different operating temperature (the temperature at which ions can move through the electrolyte). At present, PEFC is at room temperature to about 90 ° C, PAFC is about 150 ° C to 200 ° C, and MCFC is about 650 ° C to 700 ° C. , SOFC is about 700 ° C to 1000 ° C.

As shown in FIGS. 9 and 10, a general fuel battery cell is located between a pair of interconnectors 100 a and 100 b and the interconnectors 100 a and 100 b, and electrode surfaces 102 a and 102 b on both upper and lower surfaces of the electrolyte 101. Are formed in the plate-like cell body 103, the reaction gas chambers 104a and 104b formed between the interconnectors 100a and 100b and the electrode surfaces 102a and 102b, and the reaction gas chambers 104a and 104b. Provided in each of the reaction gas chambers 104a and 104b for exhausting the reaction gas after power generation, and gas supply units 105a and 105b for supplying respective reaction gases (for example, hydrogen as a fuel gas and air as an oxidant gas, for example). And exhaust portions 106a and 106b.
At least one of the reaction gas chambers 104a protrudes from the interconnector 100a and has a seal wall 108 placed on the cell body 103 via the gas seal member 107 at an edge opposite to the exhaust part 106a. I have.
Further, the gas supply unit 105a corresponding to the reaction gas chamber 104a reacts from the gas outlet 109 provided in the vicinity of the seal wall 108 toward the cell body 103 and in a direction intersecting with the cell body 103 substantially orthogonally. Gas is allowed to flow out (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-260384

  In the conventional fuel cell described above, the reaction gas is ejected in a substantially vertical direction from the gas outlet 109 of the gas supply unit 105a toward the cell body 103, and as indicated by an arrow (solid line) in FIG. It spreads in all directions. Therefore, since the reactive gas flows in a direction along the seal surface of the gas seal member 107 and directly acts on the seal surface, the gas seal member 107 may deteriorate quickly and the sealing performance may be reduced in a short period of time. there were. When the sealing performance of the gas seal member 107 is lowered, the reaction gas such as fuel gas leaks out, so that the utilization rate of the reaction gas is reduced, and there is a possibility that the reaction gas is mixed and burned in contact. This is not preferable because the temperature rises partially and the cell body 103 may break.

  The present invention has been made in view of the above, and an object thereof is to provide a fuel cell and a fuel cell stack in which the sealing performance of the gas seal member is improved and the gas seal member is hardly deteriorated.

[Application Example 1]
In order to achieve the above object, the present invention
A pair of interconnectors;
Located between the interconnectors, a flat cell body in which electrode surfaces are formed on both upper and lower surfaces of the electrolyte,
A reaction gas chamber formed between each interconnector and each electrode surface;
A gas supply section for supplying each reaction gas to each reaction gas chamber;
An exhaust part provided in each reaction gas chamber for discharging the reaction gas after power generation,
Wherein at least one of the reaction gas chamber, under the cell body, the when the upper interconnector side, the gas seal is provided with the moth Sushiru member on the cell body of the opposite edge and the exhaust portion A seal wall placed on the seal surface of the member ;
Further, the gas supply section corresponding to the reaction gas chamber allows the reaction gas to flow out from the gas outlet formed near the seal wall toward the cell body and in a direction intersecting the cell body. A fuel cell,
A seal that protrudes from the seal wall side toward the exhaust part side between the cell main body and the gas outlet and that the uppermost part is located above the seal surface of the gas seal member protection means is provided, thus providing a fuel cell the reaction gas so as to vary the flow of that to the exhaust portion direction is received by said seal protection means for flowing out of the gas outlet.

[Application Example 2]
A pair of interconnectors;
Located between the interconnectors, a flat cell body in which electrode surfaces are formed on both upper and lower surfaces of the electrolyte,
A reaction gas chamber formed between each interconnector and each electrode surface;
A gas supply section for supplying each reaction gas to each reaction gas chamber;
An exhaust part provided in each reaction gas chamber for discharging the reaction gas after power generation,
Wherein at least one of the reaction gas chamber, under the cell body, the when the upper interconnector side, the gas seal is provided with the moth Sushiru member on the cell body of the opposite edge and the exhaust portion A seal wall placed on the seal surface of the member ;
Further, the gas supply section corresponding to the reaction gas chamber allows the reaction gas to flow out from the gas outlet formed near the seal wall toward the cell body and in a direction intersecting the cell body. A fuel cell,
A seal that protrudes from the seal wall side toward the exhaust part side between the cell main body and the gas outlet and that the uppermost part is located above the seal surface of the gas seal member protection means is provided, thus fuel the reaction gas flowing out from the gas outlet was set to vary the flow of its receiving by said seal protection means in a direction along the wall surface of the exhaust portion direction and the sealing wall A battery cell is provided.

[Application Example 3]
Moreover, the said seal protection means provides the fuel battery cell of the application example 1 or 2 which has a site | part along the wall surface by the side of the reactive gas chamber in the said seal wall.

[Application Example 4]
In addition, in the application example 1 or 2, the seal protection unit includes an inclined portion that receives the reaction gas flowing in a direction intersecting the cell body and changes the flow direction to the exhaust portion direction. The fuel cell described is provided.

[Application Example 5]
Moreover, the said seal protection means provides the fuel battery cell as described in any one of the application examples 1-4 which are integral with the said gas seal member.

[Application Example 6]
Further, the gas seal member is formed of an elastic member and is interposed between the seal wall and the cell body in a collapsed state,
Moreover, the said seal protection means provides the fuel battery cell of the application example 5 which is formed in the part which protruded a part of said elastic member to the said reaction gas chamber side.

[Application Example 7]
Moreover, the fuel cell as described in any one of the application examples 1-4 with which the said seal wall and the said seal protection means are separate bodies is provided.

[Application Example 8]
Moreover, the fuel cell stack formed by laminating and fixing a plurality of the fuel cells described in any one of the application examples 1 to 7 is provided.

  In the fuel cell of the present invention, the reaction gas flowing out from the gas outlet in the direction intersecting the cell main body is received by the seal protection means, and the flow is directed to the exhaust portion or along the wall surface of the seal wall or Application Example 2. Therefore, the flow of the reaction gas that directly acts on the seal surface of the gas seal member is suppressed. Accordingly, the sealing performance of the gas seal member is improved, and the progress of deterioration of the gas seal member is delayed, so that the durability is also improved.

  Specifically, as in Application Example 3, the seal protection means is provided with a portion along the wall surface of the seal wall on the reaction gas chamber side, so that the reaction gas received by the seal protection means is directed along the wall surface of the seal wall. Can be changed. Therefore, even if the reaction gas reaches the seal surface of the gas seal member through the gap between the portion along the wall surface of the seal protection means and the wall surface, there is no momentum like a direct hit state, so the influence is slight. is there.

  Further, as in Application Example 4, the sealing surface of the gas seal member is provided by providing an inclined portion that receives the reaction gas flowing in the direction intersecting the cell body and changing the flow direction to the exhaust portion direction. The flow of the reaction gas that directly acts on the gas is effectively suppressed.

  Further, as in Application Example 5, by integrating the seal protection means with the gas seal member, it is possible to cope with existing fuel cells by simply replacing the gas seal member.

  Further, as in Application Example 6, the gas seal member is formed of an elastic member, and the gas seal member is interposed between the seal wall and the cell body in a crushed state, so that the reaction gas chamber side of the elastic member When the seal protection means is formed at the protruding portion, the seal protection means can be formed very easily.

  Further, when the seal wall and the seal protection means are separated as in Application Example 7, the seal protection means can be added to the existing fuel cell without significant modification.

It is a perspective view of the fuel battery cell which shows a principal part in a section. It is a center longitudinal cross-sectional view of a fuel cell. It is a principal part expanded sectional view which expands and shows the right half of FIG. It is the center longitudinal cross-sectional view of the fuel cell stack which abbreviate | omitted the intermediate part of the lamination direction. FIG. 4 is an enlarged cross-sectional view showing a main part of a fuel cell according to a second embodiment. FIG. 6 is an enlarged cross-sectional view showing a main part of a fuel battery cell according to Embodiment 3. The fuel cell of Embodiment 3 is shown, (a) is a principal part expanded sectional view which shows the state before an assembly, (b) is a principal part expanded sectional view which shows the state after an assembly. It is a principal part expanded sectional view containing the enlarged view (z) which shows the fuel cell of Embodiment 3. FIG. It is a perspective view of the conventional fuel cell which shows the principal part in cross section. It is a principal part expanded sectional view of the conventional fuel cell.

[Embodiment 1]
Embodiment 1 of the present invention will be described below with reference to FIGS.
The fuel cell 1 of Embodiment 1 is of the solid oxide type (SOFC) among the four types described above. As shown in FIG. 1, the fuel cell 1 has a disk shape in which an intermediate passage 2 penetrating in the axial direction is provided at the center of a circle, and includes a pair of upper and lower interconnectors 3a and 3b and the interconnector 3a. , 3b, and the cell body 6 in which the electrode surfaces 5a and 5b are formed on the upper and lower surfaces of the electrolyte 4, and the reaction formed between the interconnectors 3a and 3b and the electrode surfaces 5a and 5b. Gas chambers 7a and 7b, gas supply portions 8a and 8b for supplying the reaction gases to the reaction gas chambers 7a and 7b, and reaction gas chambers 7a and 7b for discharging the reaction gas after power generation are provided. And exhaust portions 9a and 9b.

  In the first embodiment, for example, air as an oxidant gas is supplied to the upper reaction gas chamber 7a in FIG. 1, and for example, hydrogen as a fuel gas is supplied to the lower reaction gas chamber 7b. Therefore, the upper reaction gas chamber 7a is the “air chamber”, the lower reaction gas chamber 7b is the “fuel chamber”, the upper electrode surface 5a is the “air electrode”, the lower electrode surface 5b is the “fuel electrode”, and the upper The gas supply unit 8a on the reaction gas chamber 7a side is also referred to as an “air supply unit”, and the gas supply unit 8b on the lower reaction gas chamber 7b side is also referred to as a “fuel supply unit”.

[Interconnector]
The interconnectors 3a and 3b have a donut plate shape having a circular hole for forming the middle passage 2, and are made of conductive ferritic stainless steel or the like.

[Cell body]
The cell body 6 includes a ZrO ₂ ceramic electrolyte 4 formed in a donut plate shape having a circular hole for forming the middle passage 2, an air electrode 5 a formed on a surface on the air chamber 7 a side, a fuel And a fuel electrode 5b formed on the surface on the chamber 7b side.

[Cell body-electrolyte]
The electrolyte 4 is made of LaGaO ₃ ceramic, BaCeO ₃ ceramic, SrCeO ₃ ceramic, SrZrO ₃ ceramic, CaZrO ₃ ceramic, etc. in addition to ZrO ₂ ceramic.

[Cell body-air electrode]
As the material of the air electrode 5a, for example, various metals, metal oxides, metal double oxides, and the like can be used. Examples of the metal include metals such as Pt, Au, Ag, Pb, Ir, Ru, and Rh, or alloys containing two or more metals. Further, examples of the metal oxide include oxides such as La, Sr, Ce, Co, Mn and Fe (La ₂ O ₃ , SrO, Ce ₂ O ₃ , Co ₂ O ₃ , MnO ₂ and FeO). It is done. As the double oxide, a double oxide containing at least La, Pr, Sm, Sr, Ba, Co, Fe, Mn, etc. (La _1-X Sr _X CoO ₃ -based double oxide, La _1-X Sr _X FeO ₃ -based double oxide, La _1-X Sr _X Co _1-y FeO ₃ -based double oxide, La _1-X Sr _X MnO ₃ -based double oxide, Pr _1-X Ba _X CoO ₃ -based double oxide And Sm _1-X Sr _X CoO ₃ -based double oxide).

[Cell body-Fuel electrode]
The material of the fuel electrode 5b is a ceramic such as a ZrO ₂ ceramic such as zirconia or a CeO ₂ ceramic stabilized by at least one of metals such as Ni and Fe and rare earth elements such as Sc and Y. A mixture with at least one of them is mentioned. The material of the fuel electrode 5b may be a metal such as Pt, Au, Ag, Pb, Ir, Ru, Rh, Ni and Fe. These metals may be only one kind, or two or more kinds of alloys. Also good. Furthermore, a mixture (including cermet) of these metals and / or alloys and at least one of each of the above ceramics may be mentioned. Moreover, the mixture etc. of metal oxides, such as Ni and Fe, and at least 1 type of each of the said ceramic are mentioned.

[Air chamber]
The air chamber 7a includes a gas seal in which the middle passage 2 side of the upper interconnector 3a is interposed between a cylindrical seal wall 10 and the seal wall 10 and the cell body 6 (specifically, the electrolyte 4). It is closed with the member 11, and the opposite outer peripheral side is an air exhaust portion 9a opened to the outside (actually, an air exhaust path not shown). In addition, although the sealing wall 10 of embodiment showed what was shape | molded separately from the interconnector 3a and joined by welding etc., you may shape | mold integrally with the interconnector 3a.

[Air chamber-Air supply section]
A partition wall 12 is provided between the air chamber 7a and the upper interconnector 3a. The upper layer of the partition wall 12 is an air supply unit 8a. This air supply unit 8a has a plurality of supply ports 14, 14... Opened in the outer cylindrical wall 13 surrounding the outer peripheral side, air is introduced into the inside from there, and a vertical hole opened on the seal wall 10 side of the partition wall 12. The air flows out from the gas outlet 15 to the cell body 6.

  In addition, reference numeral 16a is a columnar current collecting member provided in a large number in the air chamber 7a, and the air electrode 5a and the partition wall 12 and the interconnector 3a are electrically connected by the current collecting member 16a.

[Fuel chamber]
The fuel chamber 7b includes a fuel supply portion 8b communicating with the middle passage 2 and an exhaust portion 9b having the opposite outer peripheral side opened to the outside (actually, although not shown, a fuel exhaust path). Accordingly, when the fuel gas is caused to flow through the middle passage 2, the fuel chamber 7b enters from the fuel supply portion 8b as shown by the broken line in FIG. 1, and then exits to the outside through the exhaust portion 9b.

  The reference numeral 16b is a columnar current collecting member provided in a large number in the fuel chamber 7b, and the fuel electrode 5b and the interconnector 3b are electrically connected by the current collecting member 16b.

[Seal protection means]
Inside the air chamber 7a, air flowing out from the gas outlet 15 in a direction intersecting the cell body 6 is received between the cell main body 6 and the gas outlet 15 and the air flow is transferred to the exhaust section. Seal protection means 17 is provided to change the direction 9a or the direction along the wall surface of the seal wall 10 or the direction of the exhaust part 9a and the direction along the wall surface of the seal wall 10.

As shown in FIGS. 1 to 3, the seal protection means 17 is provided from the bottom inner peripheral surface of the seal wall 10 toward the exhaust part 9 a, and from the gas outlet 15 to the cell body 6. And an inclined portion 17a which is inclined downward toward the gas outlet 15 and reaches just below the gas outlet 15. Therefore, the air flowing out from the gas outlet 15 toward the cell main body 6, that is, the air flowing out in the direction intersecting the cell main body 6, is generated by the seal protection means 17 as indicated by the arrows shown by solid lines in FIGS. When hitting the inclined portion 17a, the direction is changed to the direction of the exhaust portion 9a.
The seal protection means 17 integrated with the seal wall 10 can be formed by laser processing or etching processing.

  When air is introduced into the fuel cell 1 having the above configuration from the supply port 14 of the air supply unit 8a, the air passes through the gas outlet 15 of the air supply unit 8a as shown by an arrow (solid line) in FIG. And enters the air chamber 7a. The air that has entered the air chamber 7a hits the inclined portion 17a of the seal protection means 17 facing below the gas outlet 15 and changes its direction in the direction of the exhaust portion 9a along the inclination of the inclined portion 17a. To the outside from the exhaust part 9a.

  On the other hand, when the fuel gas is caused to flow into the middle passage 2 of the fuel cell 1, the fuel gas enters the fuel chamber 7b from the fuel supply portion 8b as indicated by an arrow (broken line) in FIG. 3, and then passes through the exhaust portion 9b. And go outside.

  When the temperature of the fuel cell 1 is raised to 700 ° C. to 1000 ° C. with the air and the fuel gas supplied to the air chamber 7a and the fuel chamber 7b as described above, the air and the fuel gas are supplied to the air electrode 5a and the electrolyte 4. Therefore, direct electric energy is generated with the air electrode 5a as the positive electrode and the fuel electrode 5b as the negative electrode. In addition, since the principle which an electrical energy generate | occur | produces in the fuel cell 1 is known, description is abbreviate | omitted.

  By stacking a plurality of the fuel cells 1 configured as described above and fixing them in series as shown in FIG. 4, a fuel cell stack 18 capable of generating power with a predetermined output can be obtained. When a plurality of fuel cells 1 are stacked, the interconnector 3b above the fuel cell 1 positioned below can use the interconnector 3a below the fuel cell 1 positioned above.

[Embodiment 2]
As shown in FIG. 5, the fuel cell 1 according to the second embodiment forms the seal protection means 17 separately from the seal wall 10 and welds the seal wall 10 or the air electrode 5 a of the cell body 6 to, for example, welding. Or it joins with brazing. The material of the seal protection means 17 in this form is a metal that can be joined to the seal wall 10 or the air electrode 5a by a joining means such as welding or brazing, or a ceramic having such a metal on the joining surface.
Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

[Embodiment 3]
As shown in FIG. 6, the fuel battery cell 1 of Embodiment 3 is obtained by integrating the seal protection means 17 and the gas seal member 11. The gas seal member 11 is formed of an elastic member such as mica, vermiculite, alumina felt, and the portion of the gas seal member 11 that is crushed between the seal wall 10 and the electrolyte 4 of the cell body 6 in FIG. 6 is the gas seal member 11. The portion that protrudes toward the air chamber 7 a is the seal protection means 17.
The integrated product of the gas seal member 11 and the seal protection means 17 has a uniform thickness before being crushed. When the gas seal member 11 is crushed by being sandwiched between the seal wall 10 and the electrolyte 4 of the cell body 6, seal protection is achieved. A portion 17 p corresponding to the root of the means 17 is drawn by the movement of the seal wall 10 and deformed, and the portion 17 p is along the wall surface of the seal wall 10. On the other hand, the tip side of the seal protection means 17 that protrudes to the air chamber 7a side maintains the original thickness. Accordingly, the upper surface of the seal protection means 17 does not have the inclined portion 17a as in the first and second embodiments.

In the fuel battery cell 1 having such a configuration, the air exiting from the gas outlet 15 hits the upper surface of the seal protection means 17 as indicated by an arrow (solid line) in FIG. 6 and a part of the air flows in the direction of the seal wall 10. The air hitting the seal wall 10 changes its direction in the vertical direction along the wall surface and is dispersed and loses almost the momentum. Therefore, such air is located between the root portion 17p of the seal protection means 17 and the seal wall 10. The possibility of reaching between the gas seal member 11 and the seal wall 10 through is low.
It should be noted that the seal protection means 17 of the third embodiment may be provided with an inclined portion 17a as shown in FIG. 3 before mounting, and the inclined portion 17a may exhibit the same action as that of the first embodiment.

Further, as shown in FIG. 7 (a), the seal protection means 17 integrated with the gas seal member 11 swells an elastic member 19 such as a synthetic resin, for example, on the upper surface of the electrolyte 4 of the cell body 6 so as to have a semi-cylindrical cross section. Further, as shown in FIG. 7B, the portion corresponding to the gas seal member 11 of the elastic member 19 may be crushed and formed. In this case, an arcuate inclined portion 17 a is formed on the upper surface of the seal protection means 17.
If the chamfered portion 6c is formed at the peripheral corner portion of the cell body 6 (specifically, the electrolyte 4) as shown in FIG. 8, the gas seal member 11 is deformed during crushing to cover the chamfered portion 6c. The width is increased and the sealing performance is improved.

  Since the configuration of the third embodiment other than the above is the same as that of the first embodiment, the description thereof is omitted.

As mentioned above, although this invention was demonstrated about Embodiment 1-3, of course, this invention is not limited to the said Embodiment 1-3. For example, the first to third embodiments have been described with respect to the solid oxide type (SOFC) fuel cell 1, but the above-described solid polymer type (PEFC), phosphoric acid type (PAFC), and molten carbonate type (MCFC). It is also applicable to.
In the first to third embodiments, the seal protection means 17 is provided in the air chamber 7a. However, the configurations of the air chamber 7a and the fuel chamber 7b are switched to provide the seal protection means 17 in the fuel chamber 7b. Also good.
In addition, the inclined portion 17a of the embodiment has a shape that curves in a straight line or a convex shape, but may have a shape that goes down stepwise from the gas outlet 15 toward the cell body 6 or a shape that curves in a concave shape. Good.
Further, in the embodiment, the gas outlet 15 is formed in a vertical hole shape toward the cell main body 6, but the gas outlet 15 may be provided with an inclination toward the exhaust part 9a. In such a case, since the reaction gas is directed toward the exhaust part 9a with the inclination of the gas outlet 15, the effect of the seal protection means 17 can be further ensured.

DESCRIPTION OF SYMBOLS 1 ... Fuel cell 3a, 3b ... Interconnector 4 ... Electrolyte 5a ... Electrode surface (air electrode)
5b Electrode surface (fuel electrode)
6 ... Cell body 7a ... Reaction gas chamber (air chamber)
7b Reaction gas chamber (fuel chamber)
8a: Gas supply part (air supply part)
8b Gas supply part (fuel supply part)
DESCRIPTION OF SYMBOLS 9a, 9b ... Exhaust part 10 ... Seal wall 11 ... Gas seal member 15 ... Gas outlet 17 ... Seal protection means 17a ... Inclination part 17p ... Site along the seal wall 10 of the seal protection means 17 18 ... Fuel cell stack 19 ... Elasticity Element

Claims (8)

A pair of interconnectors;
Located between the interconnectors, a flat cell body in which electrode surfaces are formed on both upper and lower surfaces of the electrolyte,
A reaction gas chamber formed between each interconnector and each electrode surface;
A gas supply section for supplying each reaction gas to each reaction gas chamber;
An exhaust part provided in each reaction gas chamber for discharging the reaction gas after power generation,
Wherein at least one of the reaction gas chamber, under the cell body, the when the upper interconnector side, the gas seal is provided with the moth Sushiru member on the cell body of the opposite edge and the exhaust portion A seal wall placed on the seal surface of the member ;
Further, the gas supply section corresponding to the reaction gas chamber allows the reaction gas to flow out from the gas outlet formed near the seal wall toward the cell body and in a direction intersecting the cell body. A fuel cell,
A seal that protrudes from the seal wall side toward the exhaust part side between the cell main body and the gas outlet and that the uppermost part is located above the seal surface of the gas seal member protection means is provided, thus a fuel cell the reaction gas flowing out characterized the kite so as to vary the flow of that to the exhaust portion direction is received by the seal protection means from the gas outlet. A pair of interconnectors;
Located between the interconnectors, a flat cell body in which electrode surfaces are formed on both upper and lower surfaces of the electrolyte,
A reaction gas chamber formed between each interconnector and each electrode surface;
A gas supply section for supplying each reaction gas to each reaction gas chamber;
An exhaust part provided in each reaction gas chamber for discharging the reaction gas after power generation,
Wherein at least one of the reaction gas chamber, under the cell body, the when the upper interconnector side, the gas seal is provided with the moth Sushiru member on the cell body of the opposite edge and the exhaust portion A seal wall placed on the seal surface of the member ;
Further, the gas supply section corresponding to the reaction gas chamber allows the reaction gas to flow out from the gas outlet formed near the seal wall toward the cell body and in a direction intersecting the cell body. A fuel cell,
A seal that protrudes from the seal wall side toward the exhaust part side between the cell main body and the gas outlet and that the uppermost part is located above the seal surface of the gas seal member protection means is provided, thus the kite to the reaction gas flowing out from the gas outlet so as to vary the flow of its receiving by said seal protection means in a direction along the wall surface of the exhaust portion direction and the sealing wall A fuel cell.   3. The fuel cell according to claim 1, wherein the seal protection means has a portion along a wall surface of the seal wall on a reaction gas chamber side.   2. The seal protecting means includes an inclined portion that receives the reaction gas flowing in a direction intersecting the cell main body and changes the flow direction to the exhaust portion direction. Or the fuel battery cell of 2.   The fuel cell according to any one of claims 1 to 4, wherein the seal protection means is integral with the gas seal member. The gas seal member is formed of an elastic member and is interposed between the seal wall and the cell body in a collapsed state,
The fuel cell according to claim 5, wherein the seal protection means is formed by a portion where a part of the elastic member protrudes to the reaction gas chamber side.   The fuel cell according to any one of claims 1 to 4, wherein the seal wall and the seal protection means are separate bodies.   A fuel cell stack comprising a plurality of fuel cell cells according to any one of claims 1 to 7 stacked and fixed.

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