JP6130577B1 - Fuel cell stack - Google Patents

Abstract

It is an object of the present invention to provide a fuel cell stack capable of suppressing damage to a power generating element portion formed at a tip portion. A fuel cell stack includes a fuel manifold, a pair of fuel cells, and a plurality of partition members. Each partition member 302 is disposed between the pair of fuel cells 301 at intervals in the width direction of the fuel cells 301. Each partition member 302 is joined to the tip of each fuel cell 301. Each power generation element unit 10 is disposed closer to the base end portion of each fuel cell 301 than the partition member 302. [Selection] Figure 2

Description

  The present invention relates to a fuel cell stack.

  The fuel cell stack includes a fuel manifold and a plurality of fuel cells (Patent Document 1). Each fuel cell extends upward from the fuel manifold. Each fuel cell has a gas flow path extending in the longitudinal direction. At the time of power generation of each fuel battery cell, fuel gas flows in the gas flow path. At the tip of each fuel cell, the fuel gas discharged from the gas flow path to the outside reacts with the air flowing outside and burns.

Japanese Patent No. 5162724

  As described above, since the fuel gas reacts with air and burns at the tip of each fuel cell, the vicinity of the tip of each fuel cell becomes high. For this reason, the problem that the electric power generation element part formed in the front-end | tip part vicinity of each fuel cell is damaged will arise. Then, this invention makes it a subject to provide the fuel cell stack which can suppress the failure | damage of the electric power generation element part formed in the front-end | tip part.

  A fuel cell stack according to an aspect of the present invention includes a fuel manifold, a pair of fuel cells, and a plurality of partition members. Each fuel cell has a power generation element section. Each fuel cell extends from the fuel manifold. Each partition member is arranged with a space between the pair of fuel cells in the width direction of the fuel cells. Each partition member is joined to the tip of each fuel cell. Each power generation element portion is arranged closer to the base end portion of each fuel cell than the partition member.

  According to this configuration, the plurality of partition members are disposed at the distal end portion of each fuel cell, and each power generation element portion is disposed closer to the base end portion of the fuel cell than each partition member. For this reason, even if it is a case where the fuel gas discharged | emitted outside from the front-end | tip part of each fuel cell burns, it can suppress that a crack arises in a power generation element part with the combustion heat. Moreover, since this partition member is arrange | positioned between a pair of fuel cell, a fuel cell stack can be manufactured easily.

  In addition, since each partition member is arranged at an interval in the width direction, air is stably discharged from between the pair of fuel cells to the outside on the front end side of each fuel cell through this gap. can do. As a result, the fuel gas discharged from the front end portion of each fuel battery cell can be stably burned.

  Preferably, each partition member has conductivity. According to this structure, a pair of fuel cell can be electrically connected via each partition member.

  Preferably, the fuel cell stack further includes a gas supply member. A gas supply member supplies the gas containing oxygen between the power generation element part arrange | positioned most proximally among each power generation element part, and a fuel manifold.

  Preferably, the ratio (W2 / W1) of the total value (W2) of the length in the width direction of each partition member to the length (W1) in the width direction of the fuel cell is 0.2 to 0.8. .

  According to the fuel cell stack of the present invention, it is possible to suppress damage to the power generation element portion formed at the tip portion.

The perspective view of a fuel cell stack. Sectional drawing of a fuel cell stack. The perspective view of a fuel manifold. The perspective view of a fuel cell. Sectional drawing of a fuel cell. Sectional drawing of a fuel cell. The front view of a fuel cell stack. The figure which shows the junction part of a fuel cell and a fuel manifold. The figure which shows the gas supply method to a fuel cell stack. The figure which shows the manufacturing method of a fuel cell stack. The figure which shows the manufacturing method of a fuel cell stack. The front view of a fuel cell stack. Sectional drawing of the fuel cell stack concerning the comparative example 1. FIG. Sectional drawing of the fuel cell stack which concerns on the comparative example 2. FIG.

  Hereinafter, embodiments of a fuel cell stack according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the fuel cell stack 100 includes a fuel manifold 200, a plurality of fuel cells 301, and a plurality of partition members 302.

  As shown in FIG. 3, the fuel manifold 200 is configured to distribute the fuel gas to the fuel cells 301. The fuel manifold 200 is hollow and has an internal space. Fuel gas is supplied to the internal space of the fuel manifold 200 through the introduction pipe 201. The fuel manifold 200 has a plurality of through holes 202 arranged along the first direction (z-axis direction). In the present embodiment, the longitudinal direction of the fuel manifold 200 extends along the first direction. Each through hole 202 is formed in the top plate 203 of the fuel manifold 200. Each through hole 202 communicates the internal space of the fuel manifold 200 with the outside.

  As shown in FIG. 2, each fuel cell 301 extends from the fuel manifold 200. Specifically, each fuel cell 301 extends upward (x-axis direction) from the top plate 203 of the fuel manifold 200. That is, the longitudinal direction of each fuel cell 301 extends upward. The length of each fuel cell 301 protruding from the fuel manifold 200 in the longitudinal direction (x-axis direction) can be about 100 to 300 mm. Further, the fuel battery cells 301 are arranged at intervals in the first direction. The interval between the fuel cells 301 in the first direction can be about 1 to 5 mm.

  As shown in FIG. 4, the fuel battery cell 301 includes a plurality of power generation element units 10 and a support substrate 20. Each power generating element unit 10 is supported on both surfaces of the support substrate 20. Each power generation element unit 10 may be supported only on one side of the support substrate 20. The power generation element units 10 are arranged at intervals in the longitudinal direction (x-axis direction) of the fuel battery cell 301. That is, the fuel cell 301 according to the present embodiment is a so-called horizontal stripe fuel cell. The power generating element units 10 are electrically connected to each other by an electrical connection unit 30 (see FIG. 5).

  The support substrate 20 has a plurality of gas passages 21 extending in the longitudinal direction of the support substrate 20 inside. Each gas flow path 21 extends from one end surface of the support substrate 20 to the other end surface. That is, each gas flow path 21 extends from the end surface on the proximal end side of each fuel cell 301 to the end surface on the distal end side. Each gas channel 21 extends substantially parallel to each other. As shown in FIG. 5, the support substrate 20 has a plurality of first recesses 22. Each first recess 22 is formed on both surfaces of the support substrate 20. The first recesses 22 are arranged at intervals in the longitudinal direction of the support substrate 20. Each first recess 22 is not formed at both ends of the support substrate 20 in the width direction (y-axis direction).

The support substrate 20 is made of a porous material that does not have electronic conductivity. The support substrate 20 can be made of, for example, CSZ (calcia stabilized zirconia). Alternatively, the support substrate 20 may be composed of NiO (nickel oxide) and YSZ (8YSZ) (yttria-stabilized zirconia), or composed of NiO (nickel oxide) and Y ₂ O ₃ (yttria). Alternatively, MgO (magnesium oxide) and MgAl ₂ O ₄ (magnesia alumina spinel) may be used. The porosity of the support substrate 20 is, for example, about 20 to 60%.

  Each power generation element unit 10 includes a fuel electrode 4, an electrolyte 5, and an air electrode 6. Each power generation element unit 10 further includes a reaction preventing film 7. The fuel electrode 4 is a fired body made of a porous material having electron conductivity. The fuel electrode 4 includes a fuel electrode current collector 41 and a fuel electrode active part 42.

  The fuel electrode current collector 41 is disposed in the first recess 22. Specifically, the fuel electrode current collector 41 is filled in the first recess 22 and has the same outer shape as the first recess 22. Each fuel electrode current collector 41 has a second recess 41a and a third recess 41b. The anode active part 42 is disposed in the second recess 41a. Specifically, the fuel electrode active part 42 is filled in the second recess 41a.

The fuel electrode current collector 41 can be composed of, for example, NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia). Alternatively, the fuel electrode current collector 41 may be composed of NiO (nickel oxide) and Y ₂ O ₃ (yttria), or composed of NiO (nickel oxide) and CSZ (calcia stabilized zirconia). Also good. The thickness of the fuel electrode current collector 41 and the depth of the first recess 22 are about 50 to 500 μm.

  The fuel electrode active part 42 may be composed of, for example, NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia). Alternatively, the fuel electrode active part 42 may be composed of NiO (nickel oxide) and GDC (gadolinium-doped ceria). The thickness of the fuel electrode active part 42 is 5 to 30 μm.

  The electrolyte 5 is disposed so as to cover the fuel electrode 4. Specifically, the electrolyte 5 extends in the longitudinal direction from one interconnector 31 to another interconnector 31. That is, the electrolyte 5 and the interconnector 31 are alternately arranged in the longitudinal direction of the fuel battery cell 301.

  The electrolyte 5 is a fired body made of a dense material having ionic conductivity and no electronic conductivity. The electrolyte 5 can be made of, for example, YSZ (8YSZ) (yttria stabilized zirconia). Or the electrolyte 5 may be comprised from LSGM (lanthanum gallate). The thickness of the electrolyte 5 is, for example, about 3 to 50 μm.

The reaction preventing film 7 is a fired body made of a dense material and has substantially the same shape as the fuel electrode active portion 42 in a plan view. The reaction preventing film 7 is disposed at a position corresponding to the fuel electrode active part 42 through the electrolyte 5. The reaction preventing film 7 suppresses occurrence of a phenomenon in which YSZ in the electrolyte 5 and Sr in the air electrode 6 react to form a reaction layer having a large electric resistance at the interface between the electrolyte 5 and the air electrode 6. Is provided. The reaction preventing film 7 can be made of, for example, GDC = (Ce, Gd) O ₂ (gadolinium-doped ceria). The thickness of the reaction preventing film 7 is, for example, about 3 to 50 μm.

The air electrode 6 is disposed on the reaction preventing film 7. The air electrode 6 is a fired body made of a porous material having electron conductivity. The air electrode 6 can be made of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode 6 has LSF = (La, Sr) FeO ₃ (lanthanum strontium ferrite), LNF = La (Ni, Fe) O ₃ (lanthanum nickel ferrite), or LSC = (La, Sr) CoO ₃ ( Lanthanum strontium cobaltite) or the like. The air electrode 6 may be composed of two layers of a first layer (inner layer) made of LSCF and a second layer (outer layer) made of LSC. The thickness of the air electrode 6 is, for example, 10 to 100 μm.

The electrical connection unit 30 is configured to electrically connect adjacent power generation element units 10. The electrical connection unit 30 includes an interconnector 31 and an air electrode current collector film 32. The interconnector 31 is disposed in the third recess 41b. Specifically, the interconnector 31 is embedded (filled) in the third recess 41b. The interconnector 31 is a fired body made of a dense material having electronic conductivity. The interconnector 31 can be made of, for example, LaCrO ₃ (lanthanum chromite). Alternatively, the interconnector 31 may be made of (Sr, La) TiO ₃ (strontium titanate). The thickness of the interconnector 31 is, for example, 10 to 100 μm.

  The air electrode current collector film 32 is disposed so as to extend between the interconnector 31 and the air electrode 6 of the adjacent power generation element units 10. For example, the air electrode current collector is configured to electrically connect the air electrode 6 of the power generation element unit 10 disposed on the left side of FIG. 5 and the interconnector 31 of the power generation element unit 10 disposed on the right side of FIG. A membrane 32 is disposed. The air electrode current collector film 32 is a fired body made of a porous material having electron conductivity.

The air electrode current collector film 32 can be made of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode current collector film 32 may be made of LSC = (La, Sr) CoO ₃ (lanthanum strontium cobaltite). Or the air electrode current collection film | membrane 32 may be comprised from Ag (silver) and Ag-Pd (silver palladium alloy). The thickness of the air electrode current collector film 32 is, for example, about 50 to 500 μm.

  As shown in FIG. 2, each fuel cell 301 is joined to the fuel manifold 200 by the first joining material 101. Specifically, the first bonding material 101 joins the fuel manifold 200 and each fuel cell 301 in a state where each fuel cell 301 is supported by the top plate 203 of the fuel manifold 200.

  As shown in FIG. 8, each fuel cell 301 is inserted into the through hole 202 of the fuel manifold 200. The fuel battery cell 301 is fixed to the fuel manifold 200 by the first bonding material 101 in a state of being inserted into the through hole 202.

The first bonding material 101 is filled in the through hole 202 in the state where the fuel battery cell 301 is inserted. That is, the first bonding material 101 is filled in the gap between the outer peripheral surface of the fuel cell 301 and the wall surface that defines the through hole 202. The first bonding material 101 is a metal material or a glass material. The first bonding material 101 is, for example, crystallized glass. As the crystallized glass, for example, a SiO ₂ —B ₂ O ₃ system, a SiO ₂ —CaO system, or a SiO ₂ —MgO system may be employed. In the crystallized glass, the ratio (crystallinity) of “the volume occupied by the crystalline phase” to the total volume is 60% or more, and the ratio of “the volume occupied by the amorphous phase and impurities” to the total volume is 40%. % Glass. Note that amorphous glass, brazing material, ceramics, or the like may be employed as the material of the first bonding material 101. Specifically, the first bonding material 101 is at least one selected from the group consisting of SiO ₂ —MgO—B ₂ O ₅ —Al ₂ O ₃ and SiO ₂ —MgO—Al ₂ O ₃ —ZnO. .

  As shown in FIG. 2, each partition member 302 is disposed between a pair of fuel cells 301. Each partition member 302 is joined to the adjacent fuel cell 301 via the second joining material 102. Specifically, each partition member 302 is joined to the tip 304 of each fuel cell 301. Each partition member 302 partitions the space S1 between the pair of fuel cells 301 from the outside. Each power generation element unit 10 is disposed closer to the base end portion of the fuel cell 301 than each partition member 302. That is, each power generation element unit 10 is disposed in a space S <b> 1 defined by a pair of fuel cells 301 and each partition member 302.

  Each partition member 302 has conductivity. For this reason, in each partition member 302, the fuel cell 301 electrically connects the adjacent fuel cells 301. Specifically, each partition member 302 connects adjacent fuel cells 301 at the tip 304 of the fuel cells 301. The partition member 302 is disposed closer to the distal end portion than the power generating element portion 10A located closest to the distal end portion among the plurality of power generating element portions 10. Specifically, as shown in FIG. 6, the partition member 302 is disposed on the air electrode current collector film 32 extending from the power generating element portion 10 </ b> A located on the most distal end side. The “base end” of the fuel cell 301 is the end of the fuel cell 301 on the fuel manifold 200 side, and the “tip” of the fuel cell 301 is the end far from the fuel manifold 200. Part.

  As shown in FIG. 7, the partition members 302 arranged between the pair of fuel cells 301 are arranged at intervals in the width direction (y-axis direction) of the fuel cells 301. The intervals between the partition members 302 may be equal intervals or may vary. Of the partition members 302, at least a pair of partition members 302 may be disposed at intervals in the width direction, and among the partition members 302, the partition members 302 are disposed without being spaced from each other. There may be something.

  The ratio of the total value W2 (= w1 + w2 +... + Wn) of the lengths (w1, w2,..., Wn) of the n partition members 302 to the length W1 of the fuel cell 301 in the width direction. (W2 / W1) is preferably 0.2 to 0.8. Although not particularly limited, the length W1 of the fuel cell 301 in the width direction is preferably about 20 to 200 mm, and the length wn in the width direction of each partition member 302 is 1.0. It is preferable to be about ˜20 mm. Moreover, it is preferable that the number n of each partition member 302 arrange | positioned between a pair of fuel battery cell 301 shall be about 2-20 pieces, for example.

  The partition member 302 has a block shape. For example, the partition member 302 has a rectangular parallelepiped shape or a cylindrical shape. In this embodiment, the size of each partition member 302 is the same, but the size of each partition member 302 may be different. For example, the areas of the partition members 302 viewed along the first direction (z-axis direction) may be different from each other. The thermal conductivity of the partition member 302 is preferably 80 W / (m · K) or less. The thermal conductivity is a measurement result at 750 ° C.

The partition member 302 is made of a fired body of oxide ceramics, for example. Examples of such oxide ceramics include perovskite oxide and spinel oxide. Examples of the perovskite oxide include (La, Sr) MnO ₃ , (La, Sr) (Co, Fe) O _{3, and the} like. Examples of the spinel oxide include (Mn, Co) ₃ O ₄ , (Mn, Fe) ₃ O _{4, and the} like. This partition member 302 does not have flexibility, for example.

The partition member 302 is joined to each fuel cell 301 by the second joining material 102. That is, the second bonding material 102 joins each partition member 302 and each fuel cell 301. The second bonding material 102 is at least one selected from the group consisting of (Mn, Co) ₃ O ₄ , (La, Sr) MnO _3, (La, Sr) (Co, Fe) O _{3, and the} like. .

The fuel cell stack 100 configured as described above generates power as follows. A fuel gas (hydrogen gas or the like) is caused to flow through the fuel manifold 200 into the fuel gas channel 21 of each fuel cell 301 and the both surfaces of the support substrate 20 are exposed to a gas (air or the like) containing oxygen, thereby allowing the electrolyte to flow. An electromotive force is generated due to the difference in oxygen partial pressure generated between the two side surfaces of 5. When this fuel cell stack 100 is connected to an external load, a chemical reaction represented by the following formula (1) occurs in the air electrode 6, a chemical reaction represented by the following formula (2) occurs in the fuel electrode 4, and a current flows.
(1/2) · O ₂ + 2e ⁻ → O ₂ ⁻ (1)
H ₂ + O ₂ ⁻ → H ₂ O + 2e ⁻ (2)

  The gas containing oxygen is supplied to the second space S2, for example, as shown in FIG. Note that the second space S <b> 2 is a space between the power generation element portion 10 </ b> B disposed on the most proximal side among the power generation element portions 10 and the top plate 203 of the fuel manifold 200. Further, the fuel gas supplied from the fuel manifold 200 into each gas flow path 21 is discharged to the outside from the end surface of the fuel cell 301 on the front end side. That is, the discharge port of each gas flow path 21 is formed on the end face of the fuel cell unit 301 on the front end side. The fuel gas discharged to the outside reacts with the gas containing oxygen and burns.

  The fuel cell stack 100 further includes a gas supply member 400. The gas supply member 400 is configured to supply gas such as air to the second space S <b> 2 between the fuel cells 301. Note that the guide plate 401 may be installed on the opposite side of the gas supply member 400 so that the gas supplied from the gas supply member 400 efficiently flows upward. The guide plate 401 has a flat plate shape and extends in the longitudinal direction of the fuel cell 301 and also extends in the thickness direction of the fuel cell 301.

  Next, a method for manufacturing the fuel cell stack configured as described above will be described.

  First, a fuel manifold 200 and a plurality of fuel cells 301 are prepared. And as shown in FIG. 10, each fuel cell 301 is connected by the partition member 302 and the 2nd joining material 102, and the cell assembly 300 is produced. At this stage, the second bonding material 102 is not fired, and the fuel cells 301 are temporarily fixed to each other.

  Next, as shown in FIG. 11, the base end portion 303 of each fuel cell 301 of the cell assembly 300 is inserted into each through hole 202 of the fuel manifold 200. In addition, you may use the jig | tool for each fuel battery cell 301 holding a predetermined space | interval along a 1st direction.

  Next, as shown in FIG. 2, the first bonding material 101 is filled into the through hole 202 in the state where the fuel battery cell 301 is inserted. The first bonding material 101 is preferably filled to the extent that it protrudes upward from the surface of the top plate 203.

  Next, heat treatment is applied to the second bonding material 102 and the first bonding material 101. By this heat treatment, the second bonding material 102 and the first bonding material 101 are solidified, and the fuel cell stack 100 is completed. Specifically, the second bonding material 102 is fired by being subjected to heat treatment. As a result, each fuel cell 301 and the partition member 302 are fixed. Further, the first bonding material 101 is subjected to heat treatment, so that the temperature of the amorphous material reaches the crystallization temperature. Then, a crystal phase is generated inside the material at the crystallization temperature, and crystallization proceeds. As a result, the amorphous material is solidified and ceramicized to become crystallized glass. As a result, the first bonding material 101 made of crystallized glass functions, and the base end portion of each fuel cell 301 is fixed to the fuel manifold 200. Thereafter, a predetermined jig is removed from the fuel cell stack 100.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.

  For example, in the above embodiment, the partition members 302 are aligned along the width direction (y-axis direction), but may vary.

  In addition, it is only necessary that the partition members 302 that join at least the pair of fuel cells 301 are arranged at intervals in the width direction. For example, the partition member 302 that joins some of the fuel cells 301 may not be spaced in the width direction.

  Further, as shown in FIG. 12, each current collecting member 302 may not be arranged in parallel to the width direction of the fuel cell 100. In this case, the length wn of each current collecting member 302 in the width direction of the fuel cell 301 is measured by a dimension parallel to the width direction of the fuel cell 100.

  The present invention will be described more specifically with reference to the following examples and comparative examples. In addition, this invention is not limited to the following Example.

(Example)
Fuel cell stacks according to Examples 1 to 20 were produced as follows.

First, a pair of fuel cells 301 configured as described above were produced. Each fuel cell 301 has five power generation element portions 10 arranged at intervals in the longitudinal direction. A plurality of partition members 302 are arranged between the fuel cells 301, and each partition member 302 and a pair of fuel cells 301 are interposed via (Mn, Co) ₃ O ₄ and (La, Sr) MnO _3. And joined. Each partition member 302 was arranged at an interval in the width direction of the fuel cell 301. The intervals between the partition members 302 were set to be approximately equal.

Each partition member 302 has a rectangular parallelepiped shape. Each partition member 302 was formed of (La, Sr) MnO ₃ . The total length W2 of the width direction length W1 of each fuel cell 301 and the width direction length of each partition member 302 in each example is as shown in Table 1. The length W1 in the width direction of the fuel cell 301 was measured at the position where each partition member 302 was formed in the longitudinal direction. Further, the length wn in the width direction of each partition member 302 was measured in a cross-sectional shape by cutting each partition member 302 at an arbitrary position in the thickness direction (z-axis direction). When the partition members 302 are not arranged along the width direction of the fuel cell 301, the length W1 of the fuel cell 301 may be measured at an arbitrary position where at least one partition member 302 is formed. .

  In each embodiment, the configuration is the same except the length W1 of the fuel cell 301 in the width direction and the total value W2 of the lengths of the partition members 302 in the width direction.

(Comparative example)
As Comparative Examples 1, 3, 5, and 7, a fuel cell stack 100 having no partition member as shown in FIG. 13 was produced. Further, as Comparative Examples 2, 4, 6, and 8, a fuel cell stack 100 in which a pair of fuel cells 301 were connected by one partition member 302 as shown in FIG. Other configurations in the comparative example are the same as those in each example.

(Evaluation method)
For each of Examples 1-20 and Comparative Examples 1-8 produced as described above, power generation evaluation was performed at 750 ° C. for 1000 hours. A 30 ° C. humidified hydrogen gas was supplied to the fuel battery cell 301 via the fuel manifold 200. Moreover, air was supplied from the side surface side of the fuel cell 301 along the width direction. And the hydrogen gas discharged | emitted from each gas flow path 21 outside was made to react with air, and was combusted.

  In each of Examples 1 to 20 and Comparative Examples 1 to 8 where power was generated in this manner, the presence or absence of cracks was visually confirmed. In addition, the cross-sectional observation of the power generation element unit 10A is performed with a scanning electron microscope for the examples and comparative examples in which no cracks are generated, and it is confirmed whether there is a microstructural change of the power generation element unit 10A before and after power generation evaluation. did. In Table 1, the case where there was no crack and no change in microstructure was evaluated as “◎”, and the case where there was no damage but there was a change in microstructure was evaluated as “◯”. Evaluated as “x”. In this example, none of the evaluations were “x”.

  Further, in each of Examples 1 to 20 and Comparative Examples 1 to 8, the quality of the combustion state of hydrogen gas that was not used for power generation at the tip of the fuel cell 301 was evaluated. The evaluation results are shown in Table 1. In Table 1, a case where no misfire phenomenon occurred was evaluated as “◯”, and a case where a misfire phenomenon occurred was evaluated as “x”. In this example, none of the evaluations were “x”.

  In each of Examples 1 to 20 and Comparative Examples 1 to 8, the ignition state at the tip of the fuel cell 301 was evaluated. Specifically, methane gas is supplied into each gas flow path 21 of each fuel cell 301, air is supplied from the side surface between the pair of fuel cells 301, and ignition occurs at the tip of each fuel cell 301. Confirmed whether or not. The results are shown in Table 1. In Table 1, those that ignited were evaluated as “◯”, those that ignited instantaneously were evaluated as “サ ン プ ル”, and samples that did not ignite were evaluated as “×”.

  As shown in Table 1, in Comparative Examples 1, 3, 5, and 7, cracks occurred in the power generation element portion 10A in the vicinity of the partition member 302, whereas each of Examples 1 to 20 and Comparative Examples 2, 4 6 and 8, it was confirmed that no crack was generated in the power generation element portion 10A. Moreover, in Examples 2-5, 7-10, 12-15, and 17-20, there was no microstructure change in 10 A of electric power generation element parts. This is presumably because the ratio “W2 / W1” is 0.2 or more, so that the heat insulation is further improved.

  In each Example 1-20, it turned out that the misfire phenomenon of the hydrogen gas combustion in a front-end | tip part does not generate | occur | produce compared with the comparative examples 2, 4, 6, and 8. This is considered to be because the partition members 302 are spaced apart from each other in the width direction in each of the first to sixteenth embodiments.

  Moreover, in Examples 1-4, 6-9, 11-14, 16-19, it turned out that it ignites instantly compared with Example 5, 10, 15, 20. This is presumably because the ratio “W2 / W1” is 0.8 or less, so that air easily flows to the front end side of each fuel cell.

DESCRIPTION OF SYMBOLS 10: Electric power generation element part 100: Fuel cell stack 200: Fuel manifold 301: Fuel cell 302: Partition member 303: Base end part 304: Tip part 400: Gas supply member

Claims (4)

A fuel manifold;
A pair of fuel cells having a power generation element and extending from the fuel manifold;
A plurality of partition members disposed between the pair of fuel cells in the width direction of the fuel cells and spaced from each other, and joined to the tip of each fuel cell;
With
Each of the power generation element portions is disposed closer to the base end portion of the fuel cell than the partition member ,
Each of the partition members is continuous between the pair of fuel cells.
Fuel cell stack. Each partition member has conductivity,
The fuel cell stack according to claim 1. A gas supply member for supplying a gas containing oxygen between the fuel manifold and the power generation element portion disposed on the most proximal side among the power generation element portions;
The fuel cell stack according to claim 1 or 2. The ratio (W2 / W1) of the total value (W2) of the lengths in the width direction of the partition members to the length (W1) in the width direction of the fuel cells is 0.2 to 0.8. ,
The fuel cell stack according to claim 1.

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