JP2013152942A - Fuel cell stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell stack that increases the degree of steam separation in a reactant gas supply manifold and reduces the possibility of condensed water entering a reactant gas passage.SOLUTION: A fuel cell stack includes: a laminate 20 where a plurality of single cells are laminated; a reactant gas supply manifold that passes through the laminate 20 while meandering vertically and that supplies reactant gas to each of the single cells from an upper bent region of a meandering portion; and a drainage passage that passes through the laminate 20 and mingles with a lower portion of the reactant gas supply manifold.

Description

  The present invention relates to a fuel cell stack.

  In recent years, fuel cells that have high energy conversion efficiency and do not generate harmful substances due to power generation reactions have attracted attention. As one of such fuel cells, a polymer electrolyte fuel cell that operates at a low temperature of 100 ° C. or lower is known (see Patent Document 1).

  A polymer electrolyte fuel cell has a basic structure in which a polymer electrolyte membrane, which is an electrolyte membrane, is disposed between a fuel electrode and an air electrode. The fuel electrode contains hydrogen and the air electrode contains oxygen. It is a device that supplies the agent gas and generates power by the following electrochemical reaction.

Fuel electrode: H ₂ → 2H ⁺ + 2e ⁻ (1)
Air electrode: 1 / 2O ₂ + 2H ⁺ + 2e ⁻ → H ₂ O (2)
At the fuel electrode, hydrogen contained in the supplied fuel is decomposed into hydrogen ions and electrons as shown in the above formula (1). Among these, hydrogen ions move inside the solid polymer electrolyte membrane toward the air electrode, and electrons move to the air electrode through an external circuit. On the other hand, in the air electrode, oxygen contained in the oxidant gas supplied to the air electrode reacts with hydrogen ions and electrons that have moved from the fuel electrode, and water is generated as shown in the above formula (2). In this way, in the external circuit, electrons move from the fuel electrode toward the air electrode, so that electric power is taken out.

  A separator is provided outside the fuel electrode and the air electrode. The separator on the fuel electrode side is provided with a fuel gas flow path, and fuel gas is supplied to the fuel electrode. Similarly, an oxidant gas flow path is provided in the separator on the air electrode side, and oxidant gas is supplied to the air electrode. In this specification, the fuel gas and the oxidant gas are collectively referred to as “reaction gas”. In addition, a flow path of cooling water for cooling the electrodes is provided between these separators.

JP-A-3-102774

  In the polymer electrolyte fuel cell having the above-described configuration, the reaction gas is usually humidified and introduced by a humidifier, but a large amount of condensed water is generated when cooled in the reaction gas supply manifold. If the condensed water derived from the reaction gas enters the reaction gas channel and the reaction gas channel is blocked by the condensed water, the supply of the uniform reaction gas to the electrode surface is hindered and the output of the fuel cell decreases. There was a thing.

  The present invention has been made in view of such a situation, and an object of the present invention is to increase the degree of gas-water separation in the reaction gas supply manifold, and the condensed water generated in the reaction gas supply manifold is supplied to the reaction gas flow. It is to provide a technique for reducing the possibility of entering the road.

  One embodiment of the present invention is a fuel cell stack. The fuel cell stack includes a stacked body in which a plurality of unit cells each provided with an electrolyte membrane between a pair of electrodes are stacked, and a first reactive gas supply that passes through the stacked body and supplies a reactive gas to each unit cell. A manifold and a second reaction gas supply manifold; and a communication hole connecting the first reaction gas supply manifold and the second reaction gas supply manifold. The second reaction gas supply manifold includes a first reaction gas. Arranged vertically above the supply manifold, the reaction gas is supplied from the outside to the first reaction gas supply manifold, flows into the second reaction gas supply manifold through the communication hole, and is supplied to the second reaction gas supply. The first reaction gas supply manifold is distributed from the manifold to each single cell, and serves as a drainage channel for discharging condensed water.

  According to this aspect, the reaction gas is supplied from the outside to the first reaction gas supply manifold, and is introduced into the second reaction gas supply manifold arranged vertically above the communication hole. Distributed to the batteries. Condensed water mixed with the reaction gas stays in the first reaction gas supply manifold and is discharged outside the fuel cell stack through the first reaction gas supply manifold. Therefore, the degree of gas-water separation in the reaction gas supply manifold is increased, and the possibility that condensed water generated in the reaction gas supply manifold enters the reaction gas flow path is reduced.

  In the above aspect, the unit cell may be sandwiched between a pair of separators, and the communication hole may be provided between adjacent separators in the laminate.

  In the above aspect, a seal material that seals the first reaction gas supply manifold and the second reaction gas supply manifold is provided between the separators, and the seal materials include the first reaction gas supply manifold and the second reaction gas supply manifold. And a communicating hole may be formed in a non-extending region of the partitioning piece.

  Another aspect of the present invention is also a fuel cell stack. This fuel cell stack has a laminate in which a plurality of unit cells each provided with an electrolyte membrane between a pair of electrodes are laminated, and passes through the laminate while meandering in the vertical direction, and reacts to each unit cell from an upper bent region. A reaction gas supply manifold that supplies gas; and a drainage passage that penetrates the stack and intersects with a lower portion of the reaction gas supply manifold.

  According to this aspect, the reaction gas is supplied to the reaction gas supply manifold meandering in the vertical direction, introduced into the reaction gas flow path from the upper bent region, and distributed to each unit cell. The condensed water mixed with the reaction gas flows down against the wall surface of the reaction gas supply manifold that is bent, and is discharged to the outside of the reaction gas supply manifold through a drainage channel provided at the lower part of the reaction gas supply manifold. Therefore, the degree of gas-water separation in the reaction gas supply manifold is increased, and the possibility that condensed water generated in the reaction gas supply manifold enters the reaction gas flow path is reduced.

  In the above aspect, the unit cell is sandwiched between a pair of separators, and the separator is formed with a reaction gas through hole that forms part of the reaction gas supply manifold and a drain through hole that forms part of the drainage channel. The reactive gas through holes may be formed at different positions in the vertical direction between adjacent separators in the laminate.

  In the above aspect, a convex portion may be provided around the opening portion of the reactive gas through hole upstream of the reactive gas flow.

  A combination of the above-described elements as appropriate can also be included in the scope of the invention for which patent protection is sought by this patent application.

  According to the present invention, it is possible to increase the degree of gas-water separation in the reaction gas supply manifold, and to reduce the possibility that condensed water generated in the reaction gas supply manifold enters the reaction gas flow path. .

1 is a schematic perspective view showing a configuration of a fuel cell stack according to Embodiment 1. FIG. It is a schematic side view when the fuel cell stack of FIG. 1 is seen from the A1 direction. It is a schematic side view when the fuel cell stack of FIG. 1 is seen from the A2 direction. It is a schematic side view when the fuel cell stack of FIG. 1 is seen from the A3 direction. It is a schematic plan view of the separator for cathodes used for a fuel cell stack. It is a schematic plan view of the separator for anodes used for a fuel cell stack. It is a schematic plan view of the back surface of the separator for anodes used for a fuel cell stack. It is a schematic sectional drawing which shows the structure of the oxidizing agent supply manifold in the inside of a fuel cell stack. It is a schematic plan view of the cathode separator showing a state in which a sealing material having partitioning pieces is provided on the oxidant supply manifold and the fuel supply manifold. It is an expanded partial sectional view which shows a part (A part of FIG. 8) of an oxidizing agent supply manifold. 6 is a schematic plan view of a cathode separator used in a fuel cell stack according to Embodiment 2. FIG. It is a schematic plan view of the separator for anodes used for a fuel cell stack. It is a schematic plan view of the back surface of the separator for anodes used for a fuel cell stack. It is a schematic sectional drawing which shows the structure of the oxidizing agent supply manifold in the inside of a fuel cell stack. FIG. 15 is an enlarged partial cross-sectional view showing a part of the oxidant supply manifold (B portion in FIG. 14).

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(Embodiment 1)
FIG. 1 is a schematic perspective view illustrating a configuration of a fuel cell stack 10 according to the first embodiment. FIG. 2 is a schematic side view of the fuel cell stack 10 of FIG. 1 as viewed from the A1 direction. FIG. 3 is a schematic side view of the fuel cell stack 10 of FIG. 1 when viewed from the A2 direction. 4 is a schematic side view of the fuel cell stack 10 of FIG. 1 as viewed from the A3 direction.

  The fuel cell stack 10 includes a stacked body 20 in which a plurality of cells (single cells) each provided with an electrolyte membrane between a cathode and an anode (a pair of electrodes) are stacked, and a pair of current collectors 30a and 30b (hereinafter referred to as "cells"). And a pair of end plates 32a and 32b (hereinafter, appropriately referred to as end plates 32). In the present embodiment, the end plates 32a and 32b are formed of an insulator, for example, an insulating resin.

  The laminate 20 is formed by laminating a plurality of cells each provided with a solid polymer electrolyte membrane between an anode and a cathode. The current collectors 30 are in contact with the cells located at both ends of the stacked body 20 in order to guide the current generated by the cells to the outside. The current collector 30 is provided with a connection terminal 31 for connection to the outside. The end plate 32 is fastened by a fastening mechanism (not shown) such as a bolt or a nut so that a fastening force for fastening the laminated body 20 is applied to both ends of the laminated body 20 via the current collector 30.

  The fuel cell stack 10 includes an oxidant supply manifold 100 (reaction gas supply manifold), an oxidant discharge manifold 110, a fuel supply manifold 120 (reaction gas supply manifold), a fuel discharge manifold 130, a cooling water supply manifold 140, and a cooling water discharge. A manifold 150 is provided.

  The air as the oxidant supplied to the oxidant supply manifold 100 is distributed to the cathode of each cell. The oxidant supply manifold 100 penetrates the fuel cell stack 10 and has an inlet and an outlet on the end plates 32a and 32b of the fuel cell stack 10, respectively. The outlet side of the oxidant supply manifold 100 is connected to a condensed water discharge pipe. The air that has passed through each cell without being reacted is collected in the oxidant discharge manifold 110 and discharged from the fuel cell stack 10. The oxidant discharge manifold 110 passes through the laminate 20 and the end plate 32b, and has an outlet at the end plate 32b. Details of the configuration of the oxidant supply manifold 100 will be described later.

  On the other hand, the fuel gas (reformed gas) supplied to the fuel supply manifold 120 is distributed to the anode of each cell. The fuel supply manifold 120 penetrates the fuel cell stack 10 and has an inlet and an outlet on the end plates 32a and 32b of the fuel cell stack 10, respectively. The outlet side of the fuel supply manifold 120 is connected to a condensed water discharge pipe. The fuel gas that has passed through each cell without being reacted is collected in the fuel discharge manifold 130 and discharged from the fuel cell stack 10. The fuel discharge manifold 130 passes through the stacked body 20 and the end plate 32b, and has an outlet at the end plate 32b. The details of the configuration of the fuel supply manifold 120 are the same as the configuration of the oxidant supply manifold 100 described later.

  The cooling water supplied to the cooling water supply manifold 140 is distributed to the cooling water flow path for cooling each cell. The cooling water that has passed through the cooling water flow path is collected in the cooling water discharge manifold 150 and discharged from the fuel cell stack 10. The cooling water supply manifold 140 penetrates the fuel cell stack 10 and has an inlet and an outlet on the end plates 32b and 32a of the fuel cell stack 10, respectively. The outlet side of the cooling water supply manifold 140 is used as a gas vent for extracting the gas that has entered the cooling water supply manifold 140.

(Manifold configuration)
5 is a schematic plan view of a cathode separator used in the fuel cell stack 10 according to the first embodiment, FIG. 6 is a schematic plan view of an anode separator, and FIG. 7 is a schematic plan view of a back surface of the anode separator. is there. 8 is a schematic cross-sectional view taken along the line AA in FIG. 3, showing the configuration of the oxidant supply manifold 100 inside the fuel cell stack 10, and FIG. It is an expanded partial sectional view which shows (A part of FIG. 8).

  The cathode separator 400 shown in FIG. 5 is in contact with the cathode of each cell, and the anode separator 420 shown in FIG. 6 is in contact with the anode of each cell. That is, each cell is sandwiched between a pair of separators. Further, as shown in each drawing, in the fuel cell stack 10, the oxidant supply manifold 100 includes a first oxidant supply manifold 102 (first reaction gas supply manifold) and a second oxidant supply manifold 104. (Second reactive gas supply manifold). The second oxidant supply manifold 104 is disposed above the first oxidant supply manifold 102 in the vertical direction. Similarly to the oxidant supply manifold 100, the fuel supply manifold 120 is divided into a first fuel supply manifold 122 (first reaction gas supply manifold) and a second fuel supply manifold 124 (second reaction gas supply manifold). It is divided. The second fuel supply manifold 124 is disposed above the first fuel supply manifold 122 in the vertical direction.

  The cathode separator 400 is provided with a gas flow path 402 through which air flows, as shown in FIG. Further, the cathode separator 400 is provided with a gas introduction path 404 that connects the second oxidant supply manifold 104 and the gas flow path 402. Further, the cathode separator 400 is provided with a gas discharge path 406 that connects the gas flow path 402 and the oxidant discharge manifold 110.

  As shown in FIG. 6, the anode separator 420 is provided with a gas flow path 422 through which fuel gas flows. Further, the anode separator 420 is provided with a gas introduction passage 424 that connects the second fuel supply manifold 124 and the gas passage 422. Further, the anode separator 420 is provided with a gas discharge path 426 that connects the gas flow path 422 and the fuel discharge manifold 130.

  As shown in FIG. 7, a cooling water flow path 410 is provided on the back side of the anode separator 420. A cooling water introduction passage 412 that connects the cooling water supply manifold 140 and the cooling water passage 410 is provided on the back side of the anode separator 420. Further, a cooling water discharge 414 that connects the cooling water flow path 410 and the cooling water discharge manifold 150 is provided on the back side of the anode separator 420.

  The fuel cell stack 10 configured as described above generates power using, for example, hydrogen gas as the fuel and using air as the oxidant. Specifically, in each cell (unit cell) constituting the fuel cell stack 10, an electrode reaction represented by the formula (1) occurs at the anode in contact with one surface of the solid polymer electrolyte membrane. On the other hand, at the cathode in contact with one surface of the solid polymer film, an electrode reaction represented by the formula (2) occurs. Each cell is cooled by cooling water flowing through the cooling water plate and adjusted to an appropriate temperature of about 70 to 80 ° C.

  Next, the flow of air in the oxidant supply manifold 100 and the discharge of condensed water will be described taking air as an example.

  As shown in FIG. 8, a sealing material 108 is provided between the cathode separator 400 and the anode separator 420, and the inside of the oxidant supply manifold 100 is kept airtight by sealing between the separators. Each separator is disposed with the sealant 108 interposed therebetween, so that a communication hole 106 that connects the first oxidant supply manifold 102 and the second oxidant supply manifold 104 is formed between adjacent separators. Yes. Here, the sealing material 108 may include a partition piece 108 a extending between the first oxidant supply manifold 102 and the second oxidant supply manifold 104. FIG. 9 is a schematic plan view of the cathode separator 400 showing a state in which the sealant 108 having the partition 108 a is provided on the oxidant supply manifold 100 and the fuel supply manifold 120. As shown in FIG. 9, two partition pieces 108 a extend between the first oxidant supply manifold 102 and the second oxidant supply manifold 104 so as to face each other. And the communicating hole 106 is formed in the non-extension area | region of the partition piece 108a. Therefore, the communication area of the communication hole 106 can be adjusted by the length of the partition piece 108a.

  Air is supplied to the first oxidant supply manifold 102 from the outside. The air supplied to the first oxidant supply manifold 102 is supplied from the first oxidant supply manifold 102 through the communication hole 106 and vertically above the second oxidant as shown by arrows in FIG. It flows into the supply manifold 104. Then, air reaches the gas flow path 402 from the second oxidant supply manifold 104 through the gas introduction path 404 and is distributed to each cell. At this time, most of the condensed water mixed in the air hits the inner wall of the first oxidant supply manifold 102 and flows down into the first oxidant supply manifold 102. For this reason, the inflow of condensed water to the second oxidant supply manifold 104 is suppressed. As a result, it is possible to prevent the condensed water from entering the gas flow path 402 provided in the cathode separator 400 together with air.

  The condensed water that has flowed down to the first oxidant supply manifold 102 passes through the first oxidant supply manifold 102 and flows into the condensed water discharge pipe from the outlet of the oxidant supply manifold 100. In other words, the first oxidant supply manifold is a drainage channel for discharging condensed water. In the present embodiment, the flow of air and the discharge of condensed water have been described using the oxidant supply manifold 100 as an example, but the same applies to the fuel supply manifold 120.

  As described above, in the fuel cell stack 10 of this embodiment, the reaction gas supply manifold is divided into the first and second reaction gas supply manifolds. Then, the reaction gas is supplied from the outside to the first reaction gas supply manifold, and is introduced into the second reaction gas supply manifold arranged in the vertical direction through the communication hole, so that the second reaction gas supply manifold is provided. To each cell. Condensed water mixed with the reaction gas flows down into the first reaction gas supply manifold and is discharged outside the reaction gas supply manifold through the first reaction gas supply manifold. Therefore, the degree of gas-water separation in the reaction gas supply manifold is increased, and the possibility that condensed water generated in the reaction gas supply manifold enters the reaction gas flow path is reduced.

  Further, the reaction gas supplied to the first reaction gas supply manifold flows into the second reaction gas supply manifold through the communication hole 106 having a relatively small diameter. Therefore, it is possible to suppress excess reaction gas from being distributed to the cells on the upstream side of the reaction gas flow and shortage of reaction gases distributed to the cells on the downstream side of the reaction gas flow. As a result, the reaction gas distributed to each cell can be made uniform.

(Embodiment 2)
11 is a schematic plan view of a cathode separator used in the fuel cell stack 10 according to the second embodiment, FIG. 12 is a schematic plan view of an anode separator, and FIG. 13 is a schematic plan view of a back surface of the anode separator. is there. 14 is a schematic cross-sectional view taken along the line AA in FIG. 3, showing the configuration of the oxidant supply manifold 100 inside the fuel cell stack 10, and FIG. It is an expanded partial sectional view which shows (B section of FIG. 14).

  In the present embodiment, the reaction gas supply manifold is meandered in the vertical direction, the laminated body is penetrated, the reaction gas is introduced from the upper bent region of the meandering portion into the gas flow path, and the laminated body is penetrated to react gas. The difference from Embodiment 1 is that a drainage channel intersecting with the lower part of the supply manifold is provided. Since the other configuration of the fuel cell stack and the configuration for supplying the cooling water provided on the back side of the anode separator are the same as those in the first embodiment, the same drawings are used and the description thereof is omitted.

  As shown in FIG. 11, a partition member 101 is provided in the oxidant supply manifold 100 of the cathode separator 400. An oxidizing agent through hole 103 a (reactive gas through hole) is formed in the upper region of the partition member 101, and a drainage through hole 105 is formed in the lower portion of the partition member 101. The fuel supply manifold 120 is provided with a partition member 121. A fuel through-hole 123b (reactive gas through-hole) is formed in the lower region of the partition member 121, and a drainage through-hole 125 is formed below the partition member 121 and below the fuel through-hole 123b. ing. Convex portions 107 and 127 are provided around the openings on the upstream side of the air or fuel gas flow of the oxidant through hole 103a and the fuel through hole 123b, respectively. The partition members 101 and 121 and the convex portions 107 and 127 may be formed integrally with the cathode separator 400.

  As shown in FIGS. 12 and 13, a partition member 101 is provided in the oxidant supply manifold 100 of the anode separator 420. An oxidant through hole 103b (reactive gas through hole) is formed in the lower region of the partition member 101, and a drainage through hole 105 is formed below the partition member 101 and below the oxidant through hole 103b. Is formed. The fuel supply manifold 120 is provided with a partition member 121. A fuel through-hole 123 a (reactive gas through-hole) is formed in the upper region of the partition member 121, and a drainage through-hole 125 is formed in the lower portion of the partition member 121. Convex portions 107 and 127 are provided around the openings on the upstream side of the air or fuel gas flow of the oxidant through hole 103b and the fuel through hole 123a, respectively. The partition members 101 and 121 and the convex portions 107 and 127 may be integrally formed with the anode separator 420.

  Here, the oxidant supply manifold 100 will be described as an example. The air supplied to the oxidant supply manifold 100 moves through the oxidant supply manifold 100 while passing through the oxidant through holes 103a and 103b. That is, the oxidant through holes 103 a and 103 b constitute a part of the oxidant supply manifold 100. As shown in FIG. 14, the oxidant through holes 103a and 103b are formed at different positions in the vertical direction between adjacent separators. That is, the oxidant through-hole 103a is arranged so as to be shifted vertically upward with respect to the oxidant through-hole 103b. Therefore, the oxidant supply manifold 100 penetrates the stacked body 20 while meandering in the vertical direction.

  As shown by the arrow in FIG. 15, the air supplied from the outside to the oxidant supply manifold 100 passes through the oxidant through-hole 103 b and changes its direction by the partition member 101 of the cathode separator 400 and rises. Then, the gas passes through the gas introduction path 404 to the gas flow path 402 and is distributed to each cell. In addition, the air that has not been introduced into the gas introduction path 404 passes through the oxidant through-hole 103a, changes its direction by the partition member 101 of the anode separator 420 on the downstream side, and descends. At this time, the condensed water mixed in the air hits the partition member 101 and flows down into the oxidant supply manifold 100. A drainage channel intersects the lower portion of the oxidant supply manifold 100, and the drainage through hole 105 forms a part of the drainage channel. The condensed water that has flowed down into the oxidant supply manifold 100 passes through the drainage channel and is discharged from the oxidant supply manifold 100 to the outside.

  As described above, the air moves in the meandering oxidant supply manifold 100, and after the condensed water mixed in the air hits the wall surface of the reaction gas supply manifold to be bent and is removed from the air, the meandering portion of the oxidant supply manifold 100. Is supplied to each cell from the upper bent region. As a result, it is possible to prevent the condensed water from entering the gas flow path 402 provided in the cathode separator 400 together with air. In the present embodiment, the flow of air and the discharge of condensed water have been described using the oxidant supply manifold 100 as an example, but the same applies to the fuel supply manifold 120. Further, in this embodiment, the partition members are provided for all the separators. However, for example, the partition members may be provided for a predetermined number of separators on the reaction gas inlet side.

  As described above, in the fuel cell stack 10 of the present embodiment, the reaction gas supply manifold is caused to penetrate the stacked body while meandering in the vertical direction, and the reaction gas is introduced into the gas flow path from the upper bent region. Condensed water mixed with the reaction gas flows down upon hitting the partition member, passes through the laminate 20, and is discharged to the outside of the reaction gas supply manifold through a drainage passage intersecting with the lower portion of the reaction gas supply manifold. Therefore, the degree of gas-water separation in the reaction gas supply manifold is increased, and the possibility that condensed water generated in the reaction gas supply manifold enters the reaction gas flow path is reduced.

  In addition, a convex portion is provided around the opening portion of the reactive gas through hole on the upstream side of the reactive gas flow. Therefore, the condensed water that has flowed down along the partition member 101 from the upper side of the reactive gas through-hole flows down further while bypassing the opening along the convex portion. As a result, the condensate is prevented from moving to the separator on the downstream side through the reaction gas through-holes, so that the degree of gas-water separation in the reaction gas supply manifold is further increased and generated in the reaction gas supply manifold. The possibility that condensed water enters the reaction gas flow path is reduced.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. Embodiments to which such modifications are added Can also be included in the scope of the present invention.

  For example, in the above-described embodiment, a solid polymer membrane is used as the electrolyte membrane. However, the electrolyte membrane is not limited to this, and an inorganic / organic composite polymer electrolyte membrane may be used.

  DESCRIPTION OF SYMBOLS 1 Fuel cell stack, 20 Stack, 100 Oxidant supply manifold, 101 Partition member, 102 First oxidant supply manifold, 103a, 103b Oxidant through-hole, 104 Second oxidant supply manifold, 105, 125 Drain Through hole, 106 Communication hole, 108 Sealing material, 108a Partition piece, 120 Fuel supply manifold, 121 Partition member, 122 First fuel supply manifold, 123a, 123b Fuel through hole, 124 Second fuel supply manifold, 107 127, convex portion, 400 separator for cathode, 402, 422 gas flow path, 404, 424 gas introduction path, 420 anode separator.

Claims (3)

A laminated body in which a plurality of unit cells each provided with an electrolyte membrane between a pair of electrodes are laminated;
A reaction gas supply manifold that passes through the laminate while meandering in the vertical direction, and supplies a reaction gas to each single cell from the upper bent region of the meandering portion;
A drainage channel penetrating the laminate and intersecting with the lower part of the reaction gas supply manifold;
A fuel cell stack comprising: The unit cell is sandwiched between a pair of separators,
The separator is formed with a reaction gas through-hole constituting a part of the reaction gas supply manifold and a drainage through-hole constituting a part of the drainage channel,
2. The fuel cell stack according to claim 1, wherein the reactive gas through-holes are formed at different positions in the vertical direction between adjacent separators in the stack.   3. The fuel cell stack according to claim 2, wherein a convex portion is provided around an opening portion of the reactive gas through hole upstream of the reactive gas flow.

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