JP4314183B2 - Fuel cell and fuel cell separator - Google Patents

Description

  In the present invention, an electrolyte / electrode structure provided with a pair of electrodes on both sides of an electrolyte and a separator are stacked in a horizontal direction, and the pair of electrodes is interposed between the electrolyte / electrode structure and the separator. The reaction gas flow passages for supplying the reaction gas are formed along the surface direction of the reaction gas, and the reaction gas discharge communication holes that penetrate in the stacking direction and communicate with the outlet side of the reaction gas flow channel in the substantially horizontal direction are formed. The present invention relates to a fuel cell and a fuel cell separator formed at one end in the horizontal direction of the separator.

  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. The power generation cell is sandwiched between separators (bipolar plates). 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 supply communication hole and a reaction gas discharge communication hole that are provided so as to penetrate in the stacking direction of the power generation cells, and an inlet and an outlet of a reaction gas channel that supplies the reaction gas along the electrode surface. The reaction gas supply communication hole and the reaction gas discharge communication hole communicate with each other.

  By the way, reaction product water generated during power generation is easily introduced into the oxidant gas discharge communication hole (reaction gas discharge communication hole) through which the oxidant gas flows, and stagnant water exists in the oxidant gas discharge communication hole. There is a case. On the other hand, in the fuel gas discharge communication hole (reaction gas discharge communication hole) through which the fuel gas flows, there is a risk that stagnant water may be generated due to reverse diffusion or dew condensation of generated water. Accordingly, there is a problem that the oxidizing gas discharge communication hole and the fuel gas discharge communication hole are easily reduced or blocked by the accumulated water, and the flow of the oxidizing gas and the fuel gas is hindered to reduce the power generation performance.

  Therefore, for example, a gas manifold integrated separator and a fuel cell disclosed in Patent Document 1 are known. In Patent Document 1, as shown in FIG. 6, a fuel gas introduction manifold hole 2 is provided on one end side in the horizontal direction (arrow Y direction) above the vertical direction (arrow X direction) of the separator 1. Yes. On the lower side in the vertical direction of the separator 1, a fuel gas discharge manifold hole 3 is provided at the other end in the horizontal direction.

  A fuel gas channel groove 4 is provided in the surface of the separator 1. The fuel gas flow channel groove 4 and the fuel gas introduction manifold hole 2 are connected via a fuel gas introduction port 5, while the fuel gas flow channel groove 4 and the fuel gas discharge manifold hole 3 are connected to the fuel gas discharge port. 6 are connected. A cooling water introduction manifold hole 7a and oxidant gas introduction manifold holes 8a and 8a are provided in the upper part of the separator 1, while a cooling water discharge manifold hole 7b and an oxidant gas discharge manifold hole 8b are provided in the lower part of the separator 1. , 8b are provided.

  In this case, the fuel gas introduction port 5 and the fuel gas discharge port 6 are each provided with a plurality of fuel gas flow grooves 5a and 6a extending in the vertical direction. The widths of the fuel gas flow grooves 5a and 6a are set larger than the groove width of the fuel gas flow path groove 4, and the cross sectional area of the fuel gas flow grooves 5a and 6a is the same as that of the fuel gas flow path groove 4. The cross-sectional area is larger.

  As a result, the fluid resistance of the fuel gas flow grooves 5a, 6a can be reduced, the fluid resistance of the fuel gas flow path of the separator 1 can be reduced, and condensed water can be easily discharged. It is said that it can prevent water clogging.

JP 2000-164227 A (FIG. 1)

  Usually, when the fuel cell stack is to be mounted on a vehicle such as an automobile, it is most practical to install the fuel cell stack under the floor of the automobile. Therefore, in order to ensure a sufficient living space in the vehicle compartment, it is necessary to set the height dimension of the entire fuel cell stack low.

  Therefore, in the separator 1, the fuel gas introduction manifold hole 2, the coolant introduction manifold hole 7a, and the oxidant gas introduction manifold holes 8a, 8a are set in order to set the dimension in the arrow X direction that is the dimension in the height direction low. The oxidant gas discharge manifold holes 8b and 8b, the coolant discharge manifold hole 7b, and the fuel gas discharge manifold hole 3 may be provided at both ends of the separator 1 in the direction of arrow A.

  At that time, as shown in FIG. 7, the vicinity of the outlet of the fuel gas passage groove 4 extends in the horizontal direction toward the fuel gas outlet 6, and the fuel gas flow that constitutes the fuel gas outlet 6. The groove 6 a extends in the horizontal direction between the fuel gas passage groove portion 4 and the fuel gas discharge manifold hole 3.

  However, since the fuel gas flow groove 6a is disposed in the horizontal direction, the condensed water (including the back-diffused generated water) generated in the fuel gas flow path groove portion 4 may stay in the fuel gas flow groove 6. There is. Accordingly, there is a problem that the fuel gas flow groove 6a is easily reduced or blocked by the staying water, the flow of the fuel gas is hindered, and the power generation performance is deteriorated.

  The present invention solves this type of problem, and smoothly and reliably discharges water from the power generation region of the electrolyte / electrode structure to the reaction gas discharge communication hole, and ensures good power generation performance with a simple configuration. It is an object of the present invention to provide a fuel cell and a fuel cell separator that can be used.

In the present invention, an electrolyte / electrode structure provided with a pair of electrodes on both sides of an electrolyte and a separator are stacked in a horizontal direction, and the pair of electrodes is interposed between the electrolyte / electrode structure and the separator. together with the reaction gas flow path for supplying a reaction gas, respectively, are formed along the surface direction of the horizontal end portion of the separator, the reaction gas discharge passage that communicates with the exit side of the reaction gas channel It is a fuel cell formed so as to penetrate in the stacking direction.

The present invention also provides an electrolyte / electrode structure in which a pair of electrodes is provided on both sides of an electrolyte and is alternately stacked in a horizontal direction, and a reactive gas flow for supplying a reactive gas along the surface direction of the pair of electrodes. with road is formed, in the horizontal direction end portion, the reaction gas discharge passage that communicates with the exit side of the reaction gas channel is the fuel cell separator formed through in the stacking direction.

The outlet side of at least one of the reaction gas channels (at least one of the oxidant gas channel and the fuel gas channel) extends in the horizontal direction, and is located on the outlet side of the reaction gas channel. the reactant gas discharge passage is provided located horizontally extended on, together with the separator is provided with a reaction gas outlet passage between the outlet side and the reactant gas discharge passage of the reaction gas flow path, the reaction gas The outlet passage is inclined downward in the gravitational direction toward the reaction gas discharge communication hole when the separators are stacked in the horizontal direction.

  Furthermore, it is preferable that at least a part of the end portion on the reaction gas channel side of the reaction gas outlet passage is disposed below the lowermost part of the reaction gas channel in the gravity direction. For this reason, the condensed water can be smoothly and reliably discharged from the end portion of the reaction gas channel, that is, from the power generation region to the reaction gas outlet passage.

  Furthermore, below the reaction gas outlet passage in the gravitational direction, a passage connecting the outlet side of the reaction gas passage and the reaction gas discharge communication hole and disposed below the lowermost portion of the reaction gas passage in the gravity direction. Is preferably provided. As a result, the condensed water can be smoothly and reliably discharged from the power generation region to the reaction gas outlet passage through the passage.

  According to the present invention, the reaction gas outlet passage connecting the outlet side of the reaction gas flow path and the reaction gas discharge communication hole is inclined downward in the gravity direction toward the reaction gas discharge communication hole side. Therefore, the condensed water existing in the power generation region is surely discharged to the reaction gas discharge communication hole using the gas flow introduced into the reaction gas flow path and the gravity. Thereby, drainage from the power generation region to the reaction gas discharge communication hole is efficiently performed, and it is possible to ensure good power generation performance with a simple configuration.

  FIG. 1 is a schematic perspective explanatory view of a fuel cell stack 10 incorporating a fuel cell according to a first embodiment of the present invention. The fuel cell stack 10 is used for in-vehicle use and is housed under the floor of a vehicle such as an automobile, for example, although not shown.

  The fuel cell stack 10 includes a stacked body 14 in which a plurality of single cells (fuel cells) 12 are stacked in the horizontal direction (arrow A direction). A terminal plate 16a, an insulating plate 18a, and an end plate 20a are sequentially disposed at one end in the stacking direction (arrow A direction) of the stacked body 14 toward the outside. At the other end in the stacking direction of the stacked body 14, a terminal plate 16b, an insulating plate 18b, and an end plate 20b are sequentially disposed outward.

  The fuel cell stack 10 is, for example, integrally held by a box-like casing (not shown) including end plates 20a, 20b configured in a square shape as end plates, or a plurality of tie rods extending in the direction of arrow A (Not shown) are integrally clamped and held.

  As shown in FIG. 2, each single cell 12 includes an electrolyte membrane / electrode structure (electrolyte / electrode structure) 22, and first and second metal separators 24, 26 that sandwich the electrolyte membrane / electrode structure 22. With. The first and second metal separators 24 and 26 have a concavo-convex shape by pressing a metal thin plate into a wave shape, a dimple shape, or the like. 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 thin film of perfluorosulfonic acid 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 film with a gas diffusion film (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). The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 28.

  One edge of the single 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 supply communication hole 40a for supplying an oxidant gas, for example, an oxygen-containing gas, A cooling medium supply communication hole 42a for supplying a medium, and a fuel gas discharge communication hole (reactive gas discharge communication hole) 44b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided in the arrow C direction (vertical direction). Arranged and provided.

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

  As shown in FIGS. 2 and 3, an oxidizing gas channel (reactive gas channel) 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 has a plurality of oxidant gas flow channel grooves 46a, and the oxidant gas flow channel groove 46a extends in the direction of arrow C while meandering in the direction of arrow B. Comprises a serpentine flow path that bends in the direction of arrow B by one reciprocal half.

  Between the inlet side of the oxidant gas channel 46 and the oxidant gas supply communication hole 40a and between the outlet side of the oxidant gas channel 46 and the oxidant gas discharge communication hole 40b, the inlet channel part 48a and the outlet channel. A portion 48b is provided. The inlet channel portion 48a includes a plurality of embosses (or dimples) 50a constituting a buffer portion, and a plurality of oxidant gas inlet passages 52a extending in the horizontal direction and communicating with the oxidant gas supply communication hole 40a. .

  The outlet flow path portion 48b includes a plurality of embosses (or dimples) 50b constituting a buffer portion, and a plurality of oxidant gas outlet passages (reactive gas outlet passages) 52b communicating with the oxidant gas discharge communication hole 40b. The oxidant gas outlet passages 52b are arranged in parallel with each other so as to incline downward in the gravitational direction (arrow C1 direction) toward the oxidant gas discharge communication hole 40b side (arrow B1 direction).

  In the oxidant gas outlet passage 52b, at least a part of the end portion on the oxidant gas flow path 46 side is disposed below the lowermost part of the oxidant gas flow path 46 in the gravity direction. Specifically, the oxidant gas outlet passage 52b disposed at the lowermost position is formed with respect to the height of the convex portion 54 constituting the oxidant gas flow channel groove 46a disposed at the lowermost position. The end position of the convex portion 56 on the convex portion 54 side is set downward by a distance H. The oxidant gas flow channel groove 46 a disposed at the lowest position corresponds to the lower end position of the power generation region of the electrolyte membrane / electrode structure 22.

  Bridge plates 57a and 57b are disposed along the seal line in the oxidant gas inlet passage 52a and the oxidant gas outlet passage 52b.

  As shown in FIG. 4, a fuel gas flow path (reactive gas flow path) 58 is provided on a 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 58 has a plurality of fuel gas flow path grooves 58a that constitute a serpentine flow path that is bent by one reciprocal half in the direction of arrow B. Between the inlet side of the fuel gas passage 58 and the fuel gas supply communication hole 44a and between the outlet side of the fuel gas passage 58 and the fuel gas discharge communication hole 44b, an inlet passage portion 60a and an outlet passage portion 60b are provided. It is done.

  The inlet flow path portion 60a includes a plurality of embosses (or dimples) 62a constituting a buffer portion and a plurality of fuel gas inlet passages 64a extending in the horizontal direction and communicating with the fuel gas supply communication hole 44a.

  The outlet flow path portion 60b includes a plurality of embosses (or dimples) 62b constituting a buffer portion and a plurality of fuel gas outlet passages (reactive gas outlet passages) 64b communicating with the fuel gas discharge communication holes 44b. The respective fuel gas outlet passages 64b are arranged in parallel with each other so as to incline downward in the gravity direction (arrow C1 direction) toward the fuel gas discharge communication hole 44b side (arrow B2 direction).

  In the fuel gas outlet passage 64 b, at least a part of the end portion on the fuel gas passage 58 side is disposed below the lowermost portion of the fuel gas passage 58 in the gravity direction. Specifically, with respect to the height of the convex portion 66 constituting the fuel gas passage groove 58a disposed at the lowermost position, the convex portion constituting the fuel gas outlet passage 64b disposed at the lowermost position. The end position of 68 on the convex portion 66 side is set downward by a distance H.

  Bridge plates 70a and 70b are disposed along the seal line in the fuel gas inlet passage 64a and the fuel gas outlet passage 64b.

  The first metal separator 24 and the second metal separator 26 integrally form a cooling medium flow path 72 on the surfaces 24b, 26b facing each other (see FIG. 2). The cooling medium flow path 72 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 58, and extends in the arrow B direction and the arrow C direction. Has a groove (not shown). The cooling medium flow path 72 communicates with the cooling medium supply communication hole 42a and the cooling medium discharge communication hole 42b.

  As shown in FIGS. 2 and 3, the first seal member 74 is integrally formed on the surfaces 24a and 24b of the first metal separator 24 around the outer peripheral edge of the first metal separator 24 by injection molding or the like. Is provided. As shown in FIGS. 2 and 4, the second seal member 76 is integrated with the surfaces 26 a and 26 b of the second metal separator 26 around the outer peripheral edge of the second metal separator 26 by injection molding or the like. Is provided.

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

  As shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas supply communication hole 40a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas supply communication hole 44a. Further, a coolant such as pure water or ethylene glycol is supplied to the coolant supply passage 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 supply communication hole 40a. In the oxidant gas flow path 46, as shown in FIG. 3, the oxidant gas is once introduced into the inlet flow path portion 48a and then 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 while meandering through the respective oxidant gas flow channel grooves 46a (see FIG. 2).

  On the other hand, the fuel gas is introduced into the fuel gas channel 58 of the second metal separator 26 from the fuel gas supply communication hole 44a. In the fuel gas channel 58, as shown in FIG. 4, after the fuel gas is once introduced into the inlet channel 60a, it is dispersed into the plurality of fuel gas channel grooves 58a. Further, the fuel gas meanders through each fuel gas flow channel 58a and moves along the anode electrode 30 of the electrolyte membrane / electrode structure 22 (see FIG. 2).

  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 supplied to and consumed by the cathode side electrode 32 is discharged from the outlet channel portion 48b to the oxidant gas discharge communication hole 40b (see FIGS. 2 and 3). Similarly, the fuel gas consumed by being supplied to the anode side electrode 30 is discharged from the outlet flow path portion 60b to the fuel gas discharge communication hole 44b (see FIGS. 2 and 4).

  On the other hand, the cooling medium supplied to the cooling medium supply communication hole 42a is introduced into the cooling medium flow path 72 formed between the first and second metal separators 24 and 26 (see FIG. 2). In the cooling medium flow path 72, the cooling medium moves in the horizontal direction (arrow B direction) and the vertical direction (arrow C 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 discharge communication hole 42b.

  In this case, in the first embodiment, as shown in FIG. 3, the first metal separator 24 is provided with an outlet channel portion 48 b, and the outlet channel portion 48 b is disposed on the outlet side of the oxidant gas channel 46. And an oxidant gas discharge passage 40b, an oxidant gas outlet passage 52b is provided. The oxidant gas outlet passage 52b is inclined downward in the gravity direction toward the oxidant gas discharge communication hole 40b.

  For this reason, the generated water existing in the power generation region of the oxidant gas flow path 46 uses the gas flow and gravity of the oxidant gas supplied to the oxidant gas flow path 46 to make the oxidant gas discharge communication hole. It is reliably discharged to 40b. Thereby, drainage from the power generation region to the oxidant gas discharge communication hole 40b is efficiently performed, and it is possible to obtain an effect that it is possible to ensure good power generation performance with a simple configuration.

  Further, the oxidant gas outlet passage 52b is arranged such that at least a part of the end portion on the oxidant gas flow path 46 side is separated by a distance H below the lowermost part of the oxidant gas flow path 46 in the gravity direction. ing. Accordingly, there is no stagnant water between the outlet side of the oxidant gas flow channel 46 and the oxidant gas outlet passage 52b, and the oxidant from the end of the oxidant gas flow channel 46, that is, from the power generation region. It is possible to smoothly and reliably discharge the generated water to the gas outlet communication hole 40b.

  On the other hand, as shown in FIG. 4, the second metal separator 26 includes an outlet channel portion 60b. The outlet channel portion 60b is connected to the outlet side of the fuel gas channel 58 and the fuel gas discharge communication hole 44b. A fuel gas outlet passage 64b is provided between the two. The fuel gas outlet passage 64b is inclined downward in the gravitational direction toward the fuel gas discharge communication hole 44b.

  Therefore, the condensed water generated in the fuel gas channel 58 is reliably discharged to the fuel gas discharge communication hole 44b by using the gas flow of the fuel gas introduced into the fuel gas channel 58 and gravity. The same effects as those of the outlet channel portion 48b are obtained.

  In the first embodiment, the oxidant gas supply communication hole 40a, the cooling medium supply communication hole 42a, and the fuel gas discharge communication hole 44b are formed at one edge of the single cell 12 in the horizontal direction. A fuel gas supply communication hole 44a, a cooling medium discharge communication hole 42b, and an oxidant gas discharge communication hole 40b are formed at the edge. Therefore, the unit cell 12 does not have communication holes at the upper and lower ends, and can effectively shorten the dimension in the height direction (arrow C direction).

  As a result, the fuel cell stack 10 is shortened as much as possible in the height direction. For example, even when the fuel cell stack 10 is mounted under the floor of a fuel cell vehicle (not shown), a sufficient living space in the vehicle compartment is secured. It becomes possible to do.

  In the first embodiment, the oxidant gas flow path 46 and the fuel gas flow path 58 constitute a serpentine flow path, but the present invention is not limited to this. For example, the oxidant gas flow path 46 and the fuel gas flow path 58 extend in the arrow B direction. Or a U-shaped channel groove that folds once in the direction of the arrow B.

  FIG. 5 is an explanatory front view of a first metal separator 80 constituting a single cell of 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.

  The first metal separator 80 is connected to the outlet side of the oxidant gas flow path 46 and the oxidant gas discharge communication hole 40b below the oxidant gas outlet passage 52b in the gravity direction, and is connected to the oxidant gas flow path 46. A passage 82 disposed below the lowermost portion in the direction of gravity is provided. The passage 82 once extends downward from the lower end position of the outlet flow passage portion 48b, and then extends in the horizontal direction to communicate with the lower end edge portion of the oxidant gas discharge communication hole 40b.

  In the second embodiment, since the passage 82 is provided below the lowermost portion of the oxidant gas flow path 46 in the gravity direction, the outlet side of the oxidant gas flow path 46 and the oxidant gas outlet path 52b are provided. There is no stagnant water in between. Thereby, the same effect as 1st Embodiment is acquired, such as being able to discharge | release produced water reliably from the electric power generation area | region to the oxidizing agent gas discharge | release communication hole 40b.

1 is a schematic perspective view of a fuel cell stack according to a first embodiment of the present invention. It is a principal part disassembled perspective view of the single cell which comprises the said fuel cell stack. It is front explanatory drawing of the 1st metal separator which comprises the said single cell. It is front explanatory drawing of the 2nd metal separator which comprises the said single cell. It is front explanatory drawing of the 1st metal separator which comprises the single cell of the fuel cell stack concerning the 2nd Embodiment of this invention. It is front explanatory drawing of the separator of patent document 1. FIG. It is a partial explanatory view when a communicating hole is formed in the left-right direction of the separator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Single cell 22 ... Electrolyte membrane / electrode structure 24, 26, 80 ... Metal separator 28 ... Solid polymer electrolyte membrane 30 ... Anode side electrode 32 ... Cathode side electrode 40a ... Oxidant gas supply communication hole 40b ... Oxidant gas discharge communication hole 42a ... Cooling medium supply communication hole 42b ... Cooling medium discharge communication hole 44a ... Fuel gas supply communication hole 44b ... Fuel gas discharge communication hole 46 ... Oxidant gas channel 46a ... Oxidant gas channel Groove 48a, 60a ... Inlet channel portion 48b, 60b ... Outlet channel portion 52a ... Oxidant gas inlet channel 52b ... Oxidant gas outlet channel 58 ... Fuel gas channel 58a ... Fuel gas channel groove 64a ... Fuel gas inlet channel 64b ... Fuel gas outlet passage 72 ... Coolant flow path

Claims (8)

An electrolyte / electrode structure in which a pair of electrodes are provided on both sides of the electrolyte and a separator are stacked in a horizontal direction, and between the electrolyte / electrode structure and the separator, in the surface direction of the pair of electrodes. together with the reaction gas flow path for supplying a reaction gas, respectively, are formed along, in the horizontal direction end portion of the separator, through the reaction gas discharge communication hole stacking direction communicating with the exit side of the reaction gas channel A fuel cell formed by:
The outlet side of at least one of the reaction gas channels extends in the horizontal direction, and the reaction gas discharge communication hole is provided on the horizontal extension on the outlet side of the reaction gas channel,
The separator is provided with a reaction gas outlet passage between the reaction gas discharge passage and the outlet side of the reactive gas flow channel,
The fuel cell according to claim 1, wherein the reaction gas outlet passage is inclined downward in the direction of gravity toward the reaction gas discharge communication hole side. 2. The fuel cell according to claim 1, wherein the plurality of reaction gas outlet passages are arranged in parallel to each other. 3. The fuel cell according to claim 1, wherein at least a part of an end portion on the reaction gas flow channel side of the reaction gas outlet passage is disposed below the lowermost portion of the reaction gas flow channel in the gravity direction. A fuel cell. 4. The fuel cell according to claim 1, wherein an outlet side of the reaction gas passage and the reaction gas discharge communication hole are connected to a lower portion in the gravity direction of the reaction gas outlet passage, and A fuel cell, characterized in that a passage disposed below the lowermost part of the reaction gas flow path in the direction of gravity is provided. An electrolyte / electrode structure provided with a pair of electrodes on both sides of the electrolyte is alternately stacked in the horizontal direction, and a reaction gas flow path for supplying a reaction gas along the surface direction of the pair of electrodes is formed. , the horizontal end portion, a fuel cell separator reaction gas discharge communication hole is formed through in the stacking direction communicating with the exit side of the reaction gas channel,
The outlet side of at least one of the reaction gas channels extends in the horizontal direction, and the reaction gas discharge communication hole is provided on the horizontal extension on the outlet side of the reaction gas channel,
The separator is provided with a reaction gas outlet passage between the reaction gas discharge passage and the outlet side of the reactive gas flow channel,
The separator for a fuel cell, wherein the reactant gas outlet passage is inclined downward in the direction of gravity toward the reactant gas discharge communication hole side when the separator is stacked in a horizontal direction. 6. The separator for a fuel cell according to claim 5, wherein the plurality of reaction gas outlet passages are arranged in parallel to each other. 7. The separator according to claim 5 , wherein at least a part of the end portion on the reaction gas flow channel side of the reaction gas outlet passage is disposed below the lowest part of the reaction gas flow channel in the gravity direction. A fuel cell separator. The separator according to any one of claims 5 to 7 , wherein an outlet side of the reaction gas channel and the reaction gas discharge communication hole are connected to the reaction gas outlet passage below the reaction gas outlet passage in the gravity direction, and the reaction is performed. A fuel cell separator, characterized in that a passage disposed below the lowermost part of the gas flow path in the direction of gravity is provided.

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