JP2006236841A - Fuel cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure high power generation performance capable of surely preventing the stay of condensed water in a reaction gas communication hole by simple and economical constitution. <P>SOLUTION: A fuel cell stack 10 has an oxidant gas outlet communication hole 40b extending in the arrow A direction and a manifold 62a in which a hole part 68a communicating with the oxidant gas outlet communication hole 40b is installed is fit to a first end plate 20a. A plurality of projection parts 70 are formed in the superimposed region 72 and the inner circumferential part 74 corresponding to the joining portion of the oxidant gas outlet communication hole 40b and the hole part 68a. The projection parts 70 prevent the generation of water drops from water such as produced water exhausted to the oxidant gas outlet communication hole 40b by surface tension, and enhance drain performance to a pipe member 80a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes an electrolyte / electrode structure in which a pair of electrodes are provided on both sides of an electrolyte, and a laminate in which a separator is stacked in a horizontal direction, and the electrolyte / electrode structure is interposed between the separator and one separator. The reaction gas flow path for supplying the reaction gas is formed along the surface direction of the electrode, and the reaction gas communication hole communicating with the end of the reaction gas flow path penetrates the stacked body in the stacking direction. The internal manifold type fuel cell stack is formed.

  For example, a solid polymer fuel cell employs a solid polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell has an electrolyte membrane / electrode structure in which an anode side electrode and a cathode side electrode each made of an electrode catalyst (electrode catalyst layer) and porous carbon (diffusion layer) are provided on both sides of a solid polymer electrolyte membrane. A power generation cell sandwiched between separators (bipolar plates) is formed. Usually, in a fuel cell, a fuel cell stack in which a predetermined number of power generation cells are stacked is used.

  In this type of fuel cell, the anode side electrode is supplied with a fuel gas (reactive gas), for example, a gas mainly containing hydrogen (hereinafter also referred to as hydrogen-containing gas), while the cathode side electrode An oxidant gas (reactive gas), for example, a gas mainly containing oxygen or air (hereinafter also referred to as oxygen-containing gas) is supplied. In the fuel gas supplied to the anode side electrode, hydrogen is ionized on the electrode catalyst and moves to the cathode side electrode side through the electrolyte membrane. Electrons generated during that time are taken out to an external circuit and used as direct current electric energy.

  In the above fuel cell, an internal manifold is often configured to supply a fuel gas and an oxidant gas, which are reaction gases, to the anode side electrode and the cathode side electrode of each of the stacked power generation cells. The internal manifold includes a reaction gas inlet communication hole and a reaction gas outlet communication hole provided so as to penetrate in the stacking direction of the power generation cells, and a reaction gas flow path (oxidant gas) for supplying the reaction gas along the electrode surface. The reaction gas inlet communication hole and the reaction gas outlet communication hole communicate with the inlet side end and the outlet side end of the flow path and the fuel gas flow path, respectively.

  By the way, reaction product water generated during power generation is introduced into the oxidant gas outlet communication hole through which the oxidant gas flows in the stacking direction and the oxidant gas communication hole (reaction gas communication hole) which is the oxidant gas inlet communication hole. It is easy and there may be a case where stagnant water exists in the oxidant gas communication hole. On the other hand, there is a possibility that stagnant water due to condensation or the like may be generated in the fuel gas outlet communication hole through which the fuel gas flows in the stacking direction or the fuel gas communication hole (reaction gas communication hole) which is the fuel gas inlet communication hole. Accordingly, there is a problem that the oxidant gas communication hole and the fuel gas communication hole are easily reduced or blocked by the staying water, and the flow of the oxidant gas and the fuel gas is hindered to reduce the power generation performance.

  Therefore, for example, as shown in FIG. 9, the fuel cell stack disclosed in Patent Document 1 stacks a plurality of cells 1, and the stacked body of the plurality of cells 1 is connected to both ends by a pair of end plates 2. Is pinched. One end plate 2 is connected to a gas supply pipe 3 for supplying fuel gas or oxidant gas and a gas exhaust pipe 4 for discharging the fuel gas or oxidant gas.

  The gas supply pipe 3 and the gas exhaust pipe 4 are provided with a water reservoir portion 5 for temporarily storing condensed water and generated water, and a drain pipe 7 is connected to the lower portion of the water reservoir portion 5 through an electromagnetic valve 6. Has been.

  An internal manifold 9 is formed in a fuel cell stack 8 in which a plurality of cells 1 are sandwiched between a pair of end plates 2. The inner manifold 9 has an inclined bottom surface by gradually widening the hole diameter toward the gas supply pipe 3 and the gas exhaust pipe 4. Thereby, the condensed water and generated water of the internal manifold 9 smoothly flow to the respective water reservoirs 5 along the inclination of the lower surface of the internal manifold 9, and the water of the water reservoir 5 drains under the action of the electromagnetic valve 6. It is assumed that the gas is discharged through the pipe 7.

Japanese Patent Laying-Open No. 2003-177871 (FIG. 3)

  However, in Patent Document 1 described above, an electromagnetic valve 6 is connected below each water reservoir 5, and control of the electromagnetic valve 6 is required, which complicates the entire system. In addition, the dew condensation after the operation is stopped and the accumulated water formed by gravity from each cell 1 needs to be discharged by controlling the system even when the operation is stopped, which causes a loss of energy, that is, a reduction in fuel consumption. As a result, there is a problem that the cost of the entire system increases and the reliability decreases.

  Furthermore, the internal manifold 9 that expands toward each water reservoir 5 side is formed across a stack of a plurality of cells 1, and the formation of the internal manifold 9 becomes complicated, and each cell 1 has a different configuration. have. For this reason, there is a problem that the cost of the entire system is considerably increased and the handling of each cell 1 becomes complicated. In addition, since the internal manifold 9 is inclined, the overall height of the fuel cell stack becomes considerably large, and there is a problem that it is not particularly suitable for in-vehicle use.

  Furthermore, when the operation is stopped, there is a possibility that the remaining moisture in the internal manifold 9 is made into water droplets due to surface tension and the condensed water is retained. As a result, the flow passage area of the internal manifold 9 is reduced, and smooth exhaust of fuel gas or oxidant gas is not performed. In particular, in the environment below freezing point, freezing of stagnant water occurs, and low temperature start is performed satisfactorily. There is a problem that it is not.

  The present invention solves this type of problem, and with a simple and economical configuration, it is possible to reliably prevent the condensate from staying in the reaction gas communication hole and to ensure good power generation performance. An object of the present invention is to provide a fuel cell stack capable of satisfying the requirements.

  The present invention includes an electrolyte / electrode structure in which a pair of electrodes are provided on both sides of an electrolyte, and a laminate in which a separator is stacked in a horizontal direction, and the electrolyte / electrode structure is interposed between the separator and one separator. The reaction gas flow path for supplying the reaction gas is formed along the surface direction of the electrode, and the reaction gas communication hole communicating with the end of the reaction gas flow path penetrates the stacked body in the stacking direction. This is a fuel cell stack formed as described above.

  The fuel cell stack includes a manifold member disposed at at least one end of the laminate, and the manifold member communicates with the reaction gas communication hole and has a manifold communication having an opening shape different from that of the reaction gas communication hole. In addition to providing a hole, the manifold member is formed with a concave portion, a convex portion, or a concave-convex portion at a connection portion between the reaction gas communication hole and the manifold communication hole.

  Moreover, it is preferable that a concave shape part, a convex shape part, or an uneven | corrugated shaped part is provided in the side surface which goes to the reaction gas communication hole of a manifold member at least, and the internal peripheral surface of a manifold communication hole.

  According to the present invention, the manifold member is formed with a concave portion, a convex portion, or a concave-convex shape portion corresponding to a connection portion between the reaction gas communication hole and the manifold communication hole having different shapes. For this reason, the surface tension of water that is likely to occur at the connecting portion where the opening shape changes rapidly can be satisfactorily broken, and the smooth and reliable drainage treatment can be performed by preventing the formation of isolated water droplets. become.

  Moreover, the concave shape portion, the convex shape portion, or the concavo-convex shape portion has a function of reducing the drainage speed as compared with the flat portion. Therefore, water is continuously discharged from the reaction gas communication hole along the manifold communication hole, and the water is not isolated and does not generate surface tension, so that drainage can be easily improved.

  As a result, the reaction gas communication hole does not cause clogging or the like due to stagnant water, and it is possible to reliably obtain a stable power generation voltage with a simple configuration and to cause freezing of stagnant water. In particular, the low temperature startability is improved satisfactorily.

  FIG. 1 is a schematic perspective view of a fuel cell stack 10 according to a first embodiment of the present invention.

  The fuel cell stack 10 includes a stacked body 14 in which a plurality of fuel cells 12 are stacked. At both ends of the stacked body 14 in the stacking direction (arrow A direction), first and second terminal plates 16a and 16b, First and second insulating plates 18a and 18b and first and second end plates 20a and 20b are sequentially provided. Although not shown, the fuel cell stack 10 is clamped and held by, for example, a tightening bolt or a box-shaped casing.

  As shown in FIG. 2, the fuel cell 12 includes an electrolyte membrane / electrode structure (electrolyte / electrode structure) 22 stacked in a horizontal direction (arrow A direction), first and second metal separators 24, 26, Is provided. Instead of the first and second metal separators 24 and 26, for example, a carbon separator may be used.

  The electrolyte membrane / electrode structure 22 includes, for example, a solid polymer electrolyte membrane 28 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode side electrode 30 and a cathode side electrode 32 that sandwich the solid polymer electrolyte membrane 28. With. The anode side electrode 30 and the cathode side electrode 32 are uniformly coated on the surface of the gas diffusion layer with a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface. An electrode catalyst layer (not shown).

  One end edge of the fuel cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, which is the stacking direction, and an oxidant gas inlet communication hole (reactive gas) for supplying an oxidant gas, for example, an oxygen-containing gas. A communication hole) 40a, a cooling medium inlet communication hole 42a for supplying a cooling medium, and a fuel gas outlet communication hole (reactive gas communication hole) 44b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided in the direction of arrow C. They are arranged in the (vertical direction).

  The other end edge of the fuel cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, a fuel gas inlet communication hole (reaction gas communication hole) 44a for supplying fuel gas, and for discharging the cooling medium. The cooling medium outlet communication holes 42b and the oxidant gas outlet communication holes (reaction gas communication holes) 40b for discharging the oxidant gas are arranged in the direction of arrow C.

  An oxidant gas flow path (reactive gas flow path) 46 is provided on the surface 24 a of the first metal separator 24 facing the electrolyte membrane / electrode structure 22. The oxidant gas flow channel 46 includes a plurality of oxidant gas flow channel grooves 46a, and the oxidant gas flow channel groove 46a extends in the direction of arrow B. The oxidant gas channel groove 46a may constitute, for example, a serpentine channel groove that is folded back and forth by one reciprocal half in the arrow B direction.

  A fuel gas channel (reactive gas channel) 48 is provided on the surface 26 a of the second metal separator 26 facing the electrolyte membrane / electrode structure 22. Similar to the oxidant gas flow path 46, the fuel gas flow path 48 has a plurality of fuel gas flow path grooves 48 a extending in the arrow B direction.

  The first metal separator 24 and the second metal separator 26 integrally form a cooling medium flow path 50 on the surfaces 24b and 26b facing each other. The cooling medium flow path 50 is formed integrally with the back surface side of the oxidant gas flow path 46 and the back surface side of the fuel gas flow path 48, and has a plurality of cooling medium flow path grooves 50a extending in the arrow B direction. . The cooling medium flow path 50 communicates with the cooling medium inlet communication hole 42a and the cooling medium outlet communication hole 42b.

  On the surfaces 24a and 24b of the first metal separator 24, a first seal member 54 is integrally provided around the outer peripheral edge portion of the first metal separator 24 by injection molding or the like. The first seal member 54 covers the oxidant gas inlet communication hole 40a, the oxidant gas outlet communication hole 40b, and the oxidant gas flow path 46 on the surface 24a to prevent leakage of the oxidant gas. The first seal member 54 includes an oxidant gas inlet communication hole 40a, a cooling medium inlet communication hole 42a, a fuel gas outlet communication hole 44b, a fuel gas inlet communication hole 44a, a cooling medium outlet communication hole 42b, and an oxidant gas outlet communication hole 40b. This prevents the liquid junction of the first metal separator 24 from being covered. The same applies to the second seal member 56 described below.

  On the surfaces 26a and 26b of the second metal separator 26, a second seal member 56 is integrally provided around the outer peripheral edge of the second metal separator 26 by injection molding or the like. The second seal member 56 covers the fuel gas inlet communication hole 44a, the fuel gas outlet communication hole 44b, and the fuel gas flow path 48 on the surface 26a, and performs fuel gas leakage prevention. The second seal member 56 covers the cooling medium inlet communication hole 42a, the cooling medium outlet communication hole 42b, and the cooling medium flow path 50 on the surface 26b, and performs leakage prevention of the cooling medium.

  As shown in FIG. 1, manifold members 62a and 62b are attached to both end edges in the arrow B direction of the first end plate 20a. The manifold members 62a and 62b are made of a resin material and have a substantially rectangular shape that is long in the direction of arrow C. The manifold member 62a has holes (manifold communication holes) 64a, 66a and 68a arranged in the direction of arrow C.

  The holes 64a, 66a and 68a correspond to the fuel gas inlet communication hole 44a, the cooling medium outlet communication hole 42b and the oxidant gas outlet communication hole 40b of the fuel cell stack 10. The fuel gas inlet communication hole 44a, the cooling medium outlet communication hole 42b, and the oxidant gas outlet communication hole 40b are configured to have a substantially rectangular shape with an opening shape, while the holes 64a, 66a, and 68a have different opening shapes, For example, it is configured in a circular shape.

  As shown in FIGS. 3 and 4, the lower end of the hole 68a is disposed below the lower end of the oxidant gas outlet communication hole 40b, and the oxidant gas outlet communication hole is formed in the manifold member 62a. A plurality of projecting portions (convex shaped portions) 70 are formed corresponding to the connecting portion between 40b and the hole 68a. The projecting portion 70 is formed on the side surface of the manifold member 62a facing the first end plate 20a in the range of the overlapping region 72 that overlaps with the opening shape of the oxidant gas outlet communication hole 40b, and on the inner peripheral surface 74 that forms the hole 68a. Provided.

  It is desirable that the size of the protrusions 70 and the distance between them be set to a size that can destroy the surface tension of the water discharged from the oxidant gas outlet communication hole 40b to the hole 68a. Specifically, the protrusions 70 are provided with a diameter of 0.5 mm to 10 mm and spaced apart from each other by 1 mm to 5 mm.

  As shown in FIG. 1, pipe members 76a, 78a and 80a communicating with the holes 64a, 66a and 68a are attached to the manifold member 62a.

  Similar to the manifold member 62a described above, the manifold member 62b is partially overlapped with the oxidant gas inlet communication hole 40a, the cooling medium inlet communication hole 42a, and the fuel gas outlet communication hole 44b having a vertically long and substantially rectangular shape. The circular holes 64b, 66b and 68b are provided. A plurality of protrusions (not shown) are formed in the overlapping region between the inner peripheral surface of the hole 68b and the fuel gas outlet communication hole 44b. Tube members 76b, 78b and 80b communicating with the holes 64b, 66b and 68b are attached to the manifold member 62b.

  The operation of the fuel cell stack 10 configured as described above will be described below.

  As shown in FIG. 1, in the first end plate 20a constituting the fuel cell stack 10, an oxidant gas such as an oxygen-containing gas is supplied from the pipe member 76b to the oxidant gas inlet communication hole 40a, and the pipe member 76a. A fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 44a. Further, a cooling medium such as pure water or ethylene glycol is supplied from the pipe member 78b to the cooling medium inlet communication hole 42a.

  As shown in FIG. 2, the oxidant gas is introduced into the oxidant gas flow path 46 of the first metal separator 24 from the oxidant gas inlet communication hole 40a. In the oxidant gas flow path 46, the oxidant gas is dispersed in the plurality of oxidant gas flow path grooves 46a. Therefore, the oxidant gas moves along the cathode side electrode 32 of the electrolyte membrane / electrode structure 22 through each oxidant gas flow channel groove 46a.

  On the other hand, the fuel gas is introduced into the fuel gas channel 48 of the second metal separator 26 from the fuel gas inlet communication hole 44a. In the fuel gas channel 48, the fuel gas is dispersed in the plurality of fuel gas channel grooves 48a. Further, the fuel gas moves along the anode side electrode 30 of the electrolyte membrane / electrode structure 22 through each fuel gas flow channel 48a.

  Therefore, in the electrolyte membrane / electrode structure 22, the oxidant gas supplied to the cathode side electrode 32 and the fuel gas supplied to the anode side electrode 30 are consumed by an electrochemical reaction in the electrode catalyst layer, thereby generating power. Is done.

  Next, the oxidant gas consumed by being supplied to the cathode side electrode 32 is discharged to the oxidant gas outlet communication hole 40b (see FIG. 2). Similarly, the fuel gas supplied to and consumed by the anode side electrode 30 is discharged to the fuel gas outlet communication hole 44b.

  On the other hand, the cooling medium supplied to the cooling medium inlet communication hole 42a is introduced into the cooling medium flow path 50 formed between the first and second metal separators 24 and 26 (see FIG. 2). In the cooling medium flow path 50, the cooling medium moves in the horizontal direction (arrow B direction). Therefore, the cooling medium is cooled over the entire power generation surface of the electrolyte membrane / electrode structure 22 and then discharged to the cooling medium outlet communication hole 42b.

  In this case, as shown in FIGS. 1 and 3, the oxidant gas outlet communication hole 40b has a vertically long rectangular shape, while the hole portion 68a of the manifold member 62a communicating with the oxidant gas outlet communication hole 40b is compared. It has a small circular shape. For this reason, when water (product water or the like) discharged to the oxidant gas outlet communication hole 40b is discharged to the hole 68a along the flow of the used oxidant gas, as shown in FIG. The oxidant gas outlet communication hole 40b tends to accumulate in the retention region 82 on the lower side. This is because a meniscus is easily generated in the staying region 82, and water droplets are formed by the surface tension of the water, making it difficult for the water to flow.

  Therefore, in the first embodiment, as shown in FIGS. 3 and 4, a plurality of protrusions 70 are formed in the overlapping region 72 that overlaps with the opening shape of the oxidant gas outlet communication hole 40 b on the side surface of the manifold member 62 a. In addition, a plurality of protrusions 70 are formed on the inner peripheral surface 74 of the hole 68a. For this reason, the water discharged to the oxidant gas outlet communication hole 40b can break the surface tension through the plurality of protrusions 70 provided on the polymerization region 72 and the inner peripheral surface 74, and an isolated water droplet Can be prevented from forming.

  As a result, water droplets are not generated at the connection portion where the opening shape changes suddenly from the substantially rectangular oxidant gas outlet communication hole 40b to the substantially circular hole 68a, and the stay region 82 is caused. It is possible to obtain an effect that it is possible to carry out a smooth and reliable discharge process by reliably preventing the discharge.

  In addition, a plurality of projections 70 are provided corresponding to the connecting portion between the oxidant gas outlet communication hole 40b and the hole 68a, and the projection 70 has a function of lowering the drainage rate compared to the flat portion. Have. Therefore, moisture is continuously discharged from the oxidant gas outlet communication hole 40b along the hole 68a, and the moisture is not isolated and does not generate surface tension, so that drainage can be easily improved. .

  Therefore, the oxidant gas outlet communication hole 40b is not clogged with stagnant water or the like, and it is possible to reliably obtain a stable generated voltage with a simple configuration. Moreover, since the freezing of the accumulated water is prevented, there is an advantage that the low temperature startability is particularly improved.

  Similarly, a plurality of projections (not shown) are provided at the connection portion between the fuel gas outlet communication hole 44b and the hole portion 68b of the manifold member 62b, so that the same effect as that of the oxidant gas outlet communication hole 40b is provided. Is obtained.

  FIG. 5 is a partially enlarged perspective explanatory view of a manifold member 90 constituting a fuel cell stack according to the second embodiment of the present invention. The same components as those of the fuel cell stack 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  A plurality of concave portions 92 are formed in the manifold member 90 in the overlapping region 72 with the oxidant gas outlet communication hole 40b and the inner peripheral surface 74 of the hole 68a. Similar to the protrusions 70 used in the first embodiment, the size and spacing of the concave portions 92 are set so that the surface tension of the water that is likely to be generated at the connecting portion can be destroyed. .

  Therefore, in the second embodiment, it is possible to prevent the formation of isolated water droplets at the connecting portion between the oxidant gas outlet communication hole 40b and the hole 68a, and to perform efficient drainage treatment and to stabilize the water. An effect similar to that of the first embodiment can be obtained, for example, the generated power voltage can be obtained.

  FIG. 6 is an explanatory plan view of a connecting portion constituting a fuel cell stack according to the third embodiment of the present invention.

  A plurality of convex-shaped portions 100 are formed at the connection portion, and the convex-shaped portions 100 are set in a rectangular shape in plan view. For example, the convex portions 100 are arranged in pairs so that the longitudinal directions intersect each other.

  A groove 102 is provided between the convex portions 100, and the surface tension of water can be destroyed by moving the water along the groove 102. Furthermore, by setting the groove width of the groove portion 102, it is possible to prevent the water flow from becoming excessively fast and causing water droplets to remain due to water separation.

  Thereby, in 3rd Embodiment, while destroying the surface tension of water reliably, maintaining favorable drainage and ensuring stable electric power generation performance, etc., with 1st and 2nd Embodiment Similar effects can be obtained.

  FIG. 7 is an explanatory plan view of a connecting portion constituting a fuel cell stack according to the fourth embodiment of the present invention.

  As in the third embodiment, the fourth embodiment includes a plurality of convex portions 104 that are rectangular in plan view, and the convex portions 104 have their longitudinal directions directed in the same direction. In addition, a groove portion 106 is continuously provided between the convex-shaped portions 104. Therefore, the fourth embodiment can obtain the same effects as those of the third embodiment. In the third and fourth embodiments, the convex portions 100 and 104 can be formed by, for example, cutting.

  FIG. 8 is an enlarged cross-sectional view of a main part of a manifold member 110 constituting a fuel cell stack according to the fifth embodiment of the present invention.

  The manifold member 110 is formed with a concavo-convex shape portion 112 corresponding to the connection site. The uneven portion 112 can be formed by, for example, embossed transfer, rough polishing, roughing, or blasting.

  For this reason, in the fifth embodiment, the surface tension of the water can be broken by the concavo-convex shape portion 112, a good drainage treatment can be performed, and a stable power generation voltage can be reliably obtained. The same effects as those of the first to fourth embodiments can be obtained.

1 is a schematic perspective view of a fuel cell stack according to a first embodiment of the present invention. It is a disassembled perspective view of the fuel cell which comprises the said fuel cell stack. It is a principal part expansion perspective explanatory view of a manifold member which constitutes the fuel cell stack. It is principal part sectional explanatory drawing of the said manifold member. FIG. 6 is a partially enlarged perspective explanatory view of a manifold member constituting a fuel cell stack according to a second embodiment of the present invention. It is a plane explanatory view of the connecting part which constitutes the fuel cell stack concerning a 3rd embodiment of the present invention. It is a plane explanatory view of the connection part which constitutes the fuel cell stack concerning a 4th embodiment of the present invention. It is a principal part expanded sectional view of the manifold member which comprises the fuel cell stack which concerns on the 5th Embodiment of this invention. 1 is a schematic configuration explanatory diagram of a fuel cell stack disclosed in Patent Document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Fuel cell 20a, 20b ... End plate 22 ... Electrolyte membrane and electrode structure 24, 26 ... Metal separator 28 ... Solid polymer electrolyte membrane 30 ... Anode side electrode 32 ... Cathode side electrode 40a ... Oxidizing agent Gas inlet communication hole 40b ... Oxidant gas outlet communication hole 42a ... Cooling medium inlet communication hole 42b ... Cooling medium outlet communication hole 44a ... Fuel gas inlet communication hole 44b ... Fuel gas outlet communication hole 46 ... Oxidant gas flow path 48 ... Fuel Gas passage 50 ... Cooling medium passages 62a, 62b, 90, 110 ... Manifold members 64a, 64b, 66a, 66b, 68a, 68b ... Hole portion 70 ... Protrusion portion 72 ... Polymerization region 74 ... Inner peripheral surfaces 76a, 76b, 78a, 78b, 80a, 80b ... pipe member 92 ... concave shaped part 100, 104 ... convex shaped part 102, 106 ... groove part 112 ... unevenness Jo unit

Claims (2)

An electrolyte / electrode structure provided with a pair of electrodes on both sides of an electrolyte, and a laminate in which a separator is stacked in a horizontal direction, and the electrode / electrode structure is disposed between the electrolyte / electrode structure and one separator. A reaction gas flow path for supplying a reaction gas along the surface direction is formed, and a reaction gas communication hole communicating with an end of the reaction gas flow path is formed through the stacked body in the stacking direction. A fuel cell stack,
A manifold member disposed on at least one end of the laminate,
The manifold member is provided with a manifold communication hole communicating with the reaction gas communication hole and having an opening shape different from the reaction gas communication hole,
The fuel cell stack, wherein the manifold member has a concave portion, a convex portion, or a concave and convex portion formed at a connection portion between the reaction gas communication hole and the manifold communication hole.   2. The fuel cell stack according to claim 1, wherein the concave portion, the convex portion, or the concave and convex portion is provided on at least a side surface of the manifold member facing the reactive gas communication hole and an inner peripheral surface of the manifold communication hole. A fuel cell stack.

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