JP2009117138A - Fuel cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress increase in fluid resistance at the time of flowing of a coolant while realizing uniformity of temperature distribution on a surface of an MEA in a fuel cell stack. <P>SOLUTION: The fuel battery cell 20 constituting a fuel cell stack includes a first separator 30, an MEA, and a second separator 50. The first separator 30 includes a partition plate 36, a first metal plate 32 and a second metal plate 34 which are arranged on both sides of the partition plate 36 and have concave and convex portions. A fuel gas is flowed between the first metal plate 32 and the MEA 22 using the concave and convex portions of the first metal plate 32, and a coolant for cooling is flowed between the first metal plate 32 and the partition plate 36. Further, an oxidant gas is flowed between the second metal plate 34 and the MEA 22 using the concave and convex portions of the second metal plate 34 and the coolant for cooling is flowed between the second metal plate 34 and the partition plate 36. The coolant for cooling flowed interposing the partition plate 36 is mutually in opposite direction in flowing direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell stack, and more particularly to a fuel cell stack in which a plurality of unit cells including a membrane electrode assembly and a pair of separators sandwiching the membrane electrode assembly are stacked.

  Since there is little impact on the environment, fuel cells are installed in vehicles. A fuel cell, for example, supplies a fuel gas such as hydrogen to the anode side of unit cells constituting a fuel cell stack, supplies an oxidizing gas containing oxygen, such as air, to the cathode side, and requires electric power required for reaction through an electrolyte membrane. Take out. The fuel cell generates heat due to this reaction, and a coolant such as cooling water flows through the fuel cell stack for cooling.

  The unit cell constituting the fuel cell stack includes a membrane electrode assembly (MEA) having an electrolyte membrane, an anode side electrode and a cathode side electrode arranged on both sides thereof, and a pair of separators sandwiching the MEA. Although it is configured, the cooling refrigerant flows along with the fuel gas and the oxidizing gas by providing a flow path in the separator.

  For example, Patent Document 1 discloses a solid polymer electrolyte fuel cell that includes each passage plate in which fluid passages to which fluids such as fuel, air, and refrigerant are supplied are formed in the solid polymer electrolyte fuel cell. It is disclosed that the flow directions of adjacent fluid passages formed in each passage plate are reversed. Here, each fluid passage has a meandering form. Further, as a second embodiment, it is stated that a plurality of grooves that form a fluid flow path that communicates between an introduction port through which a supply fluid is introduced and a discharge port through which excess supply fluid is discharged are provided. It has been.

  Patent Document 2 discloses that in a fuel cell stack in which a unit cell having a joined body sandwiched between a first separator and a second separator is stacked, the second separator has a convex portion and a concave portion. A first metal thin plate having the same structure as a second metal thin plate is in contact with each other via a leaf spring, and is formed between the recess of the first metal plate and the leaf spring, and the recess of the second metal plate and the leaf spring. It is disclosed that a cooling medium such as cooling water is circulated between the two. Here, the cooling medium circulated between the concave portion of the first metal plate and the leaf spring is folded between one end portion of the leaf spring and introduced between the leaf spring and the concave portion of the second metal plate. In addition, it is described that the recessed part is provided extending linearly.

Japanese Patent Laid-Open No. 2001-43872 JP 2002-367665 A

  According to the configuration described in Patent Document 1, the directions of fluids flowing through adjacent meandering fluid flow paths in the plane of the separator are opposite to each other. Further, according to Patent Document 1, the second separator is composed of an uneven first metal plate and an uneven second metal plate arranged with a leaf spring interposed therebetween, and cooling that flows through the recess of the first metal plate. The medium is folded at one end of the leaf spring and flows through the recess of the second metal plate. In this way, by flowing the cooling medium in the flow paths in the separator in opposite directions, the cooling of the fuel cells can be made uniform, and the in-plane temperature distribution in the MEA can be made uniform.

  However, in the configuration of Patent Document 1, the flow path meanders and the fluid resistance increases. Further, in the configuration of Patent Document 2, since the cooling medium is folded and flowed, the fluid resistance is also increased. For this reason, there may be a limitation on the miniaturization of the circulation pump for flowing the refrigerant.

  The objective of this invention is providing the fuel cell stack which can suppress the increase in fluid resistance when a refrigerant | coolant is flowed, aiming at equalization of in-plane temperature distribution of MEA.

  A fuel cell stack according to the present invention includes a unit cell including an electrolyte membrane, a membrane electrode assembly having an anode side electrode and a cathode side electrode disposed on both sides thereof, and a pair of separators sandwiching the membrane electrode assembly. In a fuel cell stack including a stacked body in which a plurality of layers are stacked, at least one separator is formed by alternately repeating a plurality of times while a concave portion and a convex portion are continuous, and a top portion of each convex portion is formed on the anode side electrode. Anode-side metal plate that forms a fuel gas flow path between the concave portion between the adjacent convex portions and the anode-side electrode, and the concave portions and the convex portions are alternately and repeatedly formed a plurality of times. A cathode-side metal plate that forms an oxidizing gas flow path between a concave portion between adjacent convex portions and the cathode-side electrode, with each convex portion abutting on the cathode-side electrode, and an anode side The metal plate is provided between the metal plate and the cathode side metal plate, abuts against the bottom of each recess of the anode side metal plate on one side, and contacts the bottom of each recess on the cathode side metal plate on the other side. A partition plate in contact with each other, wherein a space between adjacent contact portions of the anode side metal plate is formed as a plurality of first refrigerant flow paths in which the refrigerant flows in the first direction, and adjacent contact portions of the cathode side metal plate A plurality of second refrigerant flow paths that form a plurality of second refrigerant flow paths in which the refrigerant flows in a second direction opposite to the first direction. A plurality of second refrigerant flow paths are provided independently of the refrigerant first supply port and the refrigerant first discharge port, formed in a linear shape from the supply port to one refrigerant first discharge port and connected in parallel to each other. A refrigerant first supply port and a refrigerant first discharge port are provided independently from one refrigerant second supply port. One is formed in a linear shape to the refrigerant second discharge ports which are characterized by being connected in parallel with each other.

  In the fuel cell stack according to the present invention, the position of the contact portion of the anode-side metal plate on one side of the partition plate is the same as the position of the contact portion of the cathode-side metal plate on the other side of the partition plate. Preferably, the first refrigerant channel and the second refrigerant channel are arranged at the same position across the partition plate, and the first refrigerant channel and the second refrigerant channel are arranged so that the refrigerant flows in the opposite direction to the same position across the partition plate.

  In the fuel cell stack according to the present invention, the position of the contact portion of the anode-side metal plate on one side of the partition plate is the same as the position of the contact portion of the cathode-side metal plate on the other side of the partition plate. The first refrigerant flow path and the second refrigerant flow path are arranged at a half pitch of the concave / convex pitch with the partition plate sandwiched between the first refrigerant flow path and the second refrigerant flow path. It is preferable that the refrigerant is arranged so as to flow in the opposite directions with a shift.

  With the above-described configuration, the fuel cell stack includes an anode-side metal plate and a cathode-side metal plate, and a partition plate provided between the anode-side metal plate and the separator-type metal plate. Including. Here, the fuel gas flows toward the anode side electrode using the unevenness of the anode side metal plate, the refrigerant flows toward the partition plate, and the oxidizing gas flows toward the cathode side electrode using the unevenness of the cathode side metal plate. However, the refrigerant flows toward the partition plate. Here, the refrigerant flowing through the anode side metal plate and the refrigerant flowing through the cathode side metal plate linearly flow from the independent supply port to the discharge port, and the flowing directions are opposite to each other.

  In this way, through the partition plate, a flow path that flows linearly on the anode side and the cathode side is provided, and these flow from the independent supply port to the discharge port, so that the refrigerant flows in the opposite directions to each other, While making the in-plane temperature distribution of the MEA uniform, an increase in fluid resistance when the refrigerant is flowed can be suppressed.

  Embodiments according to the present invention will be described in detail below. FIG. 1 is a diagram showing the configuration of the fuel cell stack 10. The fuel cell stack 10 is a kind of assembled battery configured such that a plurality of fuel cell cells 20, which are also called unit cells, are combined so that high-voltage generated power of about 200 V to about 300 V can be taken out. Here, each fuel battery cell 20 supplies hydrogen as a fuel gas to the anode side, supplies air as an oxidizing gas to the cathode side, and supplies necessary power by an electrochemical reaction through an electrolyte membrane that is a solid polymer membrane. Has the function of taking out.

  Since the electrochemical reaction is exothermic and has an appropriate temperature for the reaction, cooling water flows through the fuel cell stack 10 as a cooling refrigerant. A plurality of fuel cells 20 are stacked, and bundling terminal members 12 and 14 are provided at both ends thereof. Terminals 13 and 15 for taking out the generated electric power are attached to both ends of the stack. Further, the terminal member 12 is provided with a manifold portion for supplying and discharging fuel gas, oxidizing gas, and cooling water. In FIG. 1, eight opening portions 16 are shown in the terminal member 12 shown on the front side, and these are a fuel gas supply port and discharge port, an oxidizing gas supply port and discharge port, which will be described later. It corresponds to each supply port and discharge port of the cooling water of the system.

  FIG. 2 is an exploded view showing the basic configuration of the fuel battery cell 20. In the following, description will be made using the reference numerals in FIG. The fuel cell 20 includes an electrolyte membrane, a membrane electrode assembly (MEA) 22 having an anode side electrode and a cathode side electrode disposed on both sides thereof, and a pair of separators 30 and 50 sandwiching the MEA 22. The Here, when each of the pair of separators is distinguished and referred to as the first separator 30 and the second separator 50, the fuel cell stack 10 includes, for example, the first separator 30, the MEA 22, and the second separator. 50, MEA 22, first separator 30, MEA 22, second separator 50,... FIG. 2 shows a portion in which the first separator 30, the MEA 22, and the second separator 50 are stacked.

  The MEA 22 shown in FIG. 2 is a laminate of a solid polymer electrolyte membrane and a catalyst layer and a diffusion electrode layer provided on both sides of the solid polymer electrolyte membrane, respectively. For example, the catalyst layer and the diffusion electrode layer on one side serve as an anode side electrode, and the catalyst layer and the diffusion electrode layer on the other side serve as a cathode side electrode with the solid polymer electrolyte membrane interposed therebetween. Actually, the MEA 22 is configured as a member for arranging and supporting the laminate. For example, as shown in FIG. 2, it is configured as a plate material that supports and arranges the laminated body, and there are four holes each through which fuel gas, oxidizing gas, and cooling water pass at both ends of the arrangement of the laminated body. Be placed.

  The separators 30 and 50 are conductive plates that are in electrical contact with the anode side electrode or the cathode side electrode of the MEA 22 and have a function of taking out the electric power generated by the electrochemical reaction of the fuel cell. Since the separators 30 and 50 are disposed on both sides of the MEA 22 for each fuel cell 20, a voltage corresponding to the electromotive force of one fuel cell 20, for example, about 1 V is provided between the two separators 30 and 50. Therefore, a voltage of about 1.5V is applied.

  Another function of the separators 30 and 50 is to mechanically hold the MEA 22 from both ends. Therefore, the separators 30 and 50 are made of a metal plate material having an appropriate thickness for an appropriate mechanical strength. Further, the separators 30 and 50 have a function of supplying fuel gas to the anode electrode side, supplying oxidizing gas to the cathode side electrode, and flowing a cooling medium to the MEA 22.

  In FIG. 2, the separators 30 and 50 have four openings at both ends corresponding to the four openings at both ends of the MEA 22. 2, the lower side of the figure is shown as the opening 16 side of the terminal member 12 described in FIG. Therefore, among these openings, four shown on the near side in FIG. 2 are the fuel gas supply port, the second cooling refrigerant discharge port, the first cooling refrigerant supply port, respectively, from the left side. It is an oxidizing gas outlet. Further, four shown on the back side in FIG. 2 are an oxidizing gas supply port, a first cooling refrigerant discharge port, a second cooling refrigerant supply port, and a fuel gas discharge port, respectively, from the left side.

  Here, in the first cooling refrigerant supply port and the second cooling refrigerant supply port, the cooling refrigerant is supplied independently, and the first cooling refrigerant discharge port, The cooling refrigerant is discharged independently from the cooling refrigerant discharge port. Here, each independently means that, for example, the cooling refrigerant discharged from the first cooling refrigerant discharge port is folded back on the upper surface and the lower surface of the first separator 30 or the second separator 50, and again the second This means that the cooling refrigerant supply port is not supplied as it is. Referring to FIG. 1, the opening 16 corresponds to the opening corresponding to the first cooling refrigerant supply port, the opening corresponding to the second cooling refrigerant supply port, and the first cooling refrigerant discharge port. The opening and the opening corresponding to the second cooling coolant discharge port are provided separately.

  A plurality of linear fluid flow paths arranged in parallel are provided in the separators 30 and 50 between the supply port and the discharge port arranged on the near side or the back side, respectively. Since the configurations of the separators 30 and 50 are the same, the configuration of the first separator 30 is representatively shown in FIG. 3A shows the first separator 30 extracted in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line BB in FIG. Here, the BB line is a line parallel to the X direction perpendicular to the linear direction of the straight fluid flow path in the first separator 30 as the Y direction.

  The first separator 30 is composed of three metal plates. Two of them are a first metal plate 32 and a second metal plate 34 formed by alternately repeating a concave portion and a convex portion a plurality of times, and the other one is a first metal plate 32 and a first metal plate 32. 2 between the two metal plates 34, one side of which contacts the bottom of each recess of the first metal plate 32, and the other side contacts the bottom of each recess of the second metal plate 34. This is a partition plate 36. Here, since the concave portion and the convex portion are alternately repeated a plurality of times, any of them may be called a concave portion or a convex portion, but here, the portion that contacts the partition plate 36 is called the bottom portion of the concave portion.

  In the first separator 30 configured as described above, the bottom of the concave portion of the first metal plate 32 is repeatedly brought into contact with the surface on one side of the partition plate 36 at an uneven pitch in the X direction. A plurality of linear spaces parallel to the Y direction are formed at an uneven pitch by the adjacent contact portions and the partition plate 36. Since the first cooling refrigerant flows in this space, in FIG. 3B, cooling water, which is an example of the cooling refrigerant, is added to the space formed by the adjacent contact portion and the partition plate 36. The symbol (W) shown is attached. Similarly, in the first separator 30, the bottom of the concave portion of the second metal plate 34 repeatedly comes into contact with the other surface of the partition plate 36 in the X direction at an uneven pitch. A plurality of linear spaces parallel to the Y direction are formed at an uneven pitch by the adjacent contact portions and the partition plate 36. In this space, the second cooling refrigerant flows in the opposite direction to the first cooling medium. Therefore, in FIG. 3B, in order to distinguish that the flowing direction is different from the previous (W) in the space formed by the adjacent contact portion and the partition plate 36, a bar (− ) Symbols are shown.

  As described in FIG. 2, the fuel battery cell 20 is arranged as the MEA 22, the first separator 30, and the MEA 22, so that the top of the convex portion of the first metal plate 32 is on the other side of the MEA 22. The top of the convex portion of the second metal plate 34 is in contact with the surface on one side of the other MEA 22. The adjacent contact portions of the first metal plate 32 and the MEA 22 form a plurality of linear spaces parallel to the Y direction at an uneven pitch. Similarly, a plurality of linear spaces parallel to the Y direction are formed at uneven pitches by the adjacent contact portions of the second metal plate 34 and the MEA 22. As described above, the linear space formed between the unevenness of the first metal plate 32 and the MEA 22 and the linear space formed between the unevenness of the second metal plate 34 and the MEA 22 include fuel gas or Since oxidizing gas is flowed, in FIG. 3B, symbols (G) indicating gases are given to these spaces.

  FIG. 4 is a cross-sectional view taken along the line BB described in FIG. 3 for a part of the structure in which the fuel cells 20 are repeatedly stacked. In the following, elements similar to those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted. In the following, description will be made using the reference numerals in FIGS. In FIG. 4, the stacking direction of the fuel cells 20 is shown as the Z direction. The Z direction is a direction perpendicular to both the X direction and the Y direction described in FIG. FIG. 4 shows a state in which the MEA 22, the second separator 50, the MEA 22, the first separator 30, and the MEA 22 are stacked in this order from the bottom to the top in the Z direction.

  Now, regarding the MEA 22 of the portion shown as the fuel cell 20 in the center in FIG. 4, the upper surface in the paper is the anode side electrode and the lower surface is the cathode side electrode.

In the case of this arrangement, the top of the convex portion of the second metal plate 34 of the second separator 50 contacts the cathode side electrode of the MEA 22. That is, the second metal plate 34 of the second separator 50 acts as a cathode side electrode plate. An oxidizing gas flows in the space between the adjacent convex portions. In FIG. 4, these spaces are marked with (O ₂ ) indicating oxidizing gas. On the other hand, as described with reference to FIG. 3, the bottom of the concave portion of the second metal plate 34 is repeatedly brought into contact with the other surface of the partition plate 36 at the pitch of the concave and convex portions in the X direction. Then, a plurality of linear spaces parallel to the Y direction are formed at the uneven pitch by the adjacent contact portions and the partition plate 36, and the second cooling refrigerant flows in this space. In FIG. 4, a bar (−) symbol is added to W indicating the cooling refrigerant in this space. As described with reference to FIG. 3, the bar (−) is attached to the cooling refrigerant that flows between the partition plate 36 and the first metal plate 32 in the direction in which the cooling refrigerant flows. This is because the direction is opposite to the direction of the flow of

In this arrangement, the top of the convex portion of the first metal plate 32 of the first separator 30 abuts on the anode side electrode of the MEA 22. That is, the first metal plate 32 of the first separator 30 acts as the anode side electrode plate. And fuel gas is poured into the space between adjacent convex parts. In FIG. 4, symbols (H ₂ ) indicating fuel gas are attached to these spaces. On the other hand, as described with reference to FIG. 3, the bottom of the concave portion of the first metal plate 32 repeatedly comes into contact with the surface on one side of the partition plate 36 at the pitch of the concave and convex portions in the X direction. A plurality of linear spaces parallel to the Y direction are formed at the uneven pitch by the adjacent abutting portions and the partition plate 36, and the first cooling refrigerant flows in this space. In FIG. 4, this space is marked with a symbol W indicating cooling refrigerant. Here, as described with reference to FIG. 3, the flowing direction of the cooling refrigerant flowing here is opposite to the flowing direction of the cooling refrigerant flowing between the partition plate 36 and the second metal plate 34. .

  In this way, the flow paths that flow linearly on the anode side and the cathode side via the partition plate 36 are provided, respectively, and the cooling refrigerant flows so as to flow in the opposite directions from the independent supply port to the discharge port. Therefore, it is possible to suppress an increase in fluid resistance when the cooling refrigerant is flowed while achieving a uniform in-plane temperature distribution of the MEA 22.

  In the above description, the position of the contact portion of the anode side metal plate on the one side surface of the partition plate 36 is between the position of the contact portion of the cathode side metal plate on the other side surface of the partition plate 36 and the partition plate 36. The flow path through which the first cooling refrigerant flows and the flow path through which the second cooling refrigerant flow are arranged symmetrically at the same position with the partition plate 36 interposed therebetween, The cooling refrigerant and the second cooling refrigerant flow in opposite directions. Instead of this, the position of the contact portion of the anode side metal plate on the one side surface of the partition plate 36, the position of the contact portion of the cathode side metal plate on the other side surface of the partition plate, and the partition plate 36 It is possible to arrange them so as to be shifted by a half pitch of the concavo-convex pitch, which is a repeated pitch of the concave and convex portions. In the following, elements similar to those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  5 and 6 are diagrams showing examples of such a configuration. FIG. 5 is a diagram corresponding to FIG. Here, in the first separator 31, the position of the contact portion where the first metal plate 33 contacts the partition plate 36 is half the uneven pitch with respect to the position where the second metal plate 35 contacts the partition plate 36. It is shown that it is shifted by the pitch.

  FIG. 6 corresponds to FIG. Here, in the fuel cell 21 shown in the center portion, for each of the first separator 31 and the second separator 51, the position of the contact portion where the first metal plate 33 contacts the partition plate 36 is the second position. It is shown that the position where the metal plate 35 contacts the partition plate 36 is shifted by a half pitch of the uneven pitch. Accordingly, the flow path through which the first cooling refrigerant flows and the flow path through which the second cooling refrigerant flow are arranged at positions shifted by a half pitch of the uneven pitch across the partition plate 36, and the first The cooling refrigerant and the second cooling refrigerant flow in opposite directions.

  Even in such a configuration, a flow path that flows linearly on the anode side and the cathode side is provided via the partition plate 36, and these are cooled so as to flow in the opposite directions from the independent supply port to the discharge port. Since the refrigerant for cooling is flowed, an increase in fluid resistance when the cooling refrigerant is flowed can be suppressed while the in-plane temperature distribution of the MEA 22 is made uniform.

  Next, how the fluid flows from the fluid supply port in the separator to the linear fluid flow path will be described. Below, it demonstrates using the code | symbol of FIGS. 1-6. In FIG. 7, in the first separator 30 or the second separator 50, the second metal plate 34 and the partition plate 36 are not shown, and the first metal plate 32 and the partition plate 36 (not shown) are allowed to flow. It is a figure which shows the mode of the 1st refrigerant | coolant for cooling.

  Here, the first cooling refrigerant supply port 60 provided in the first metal plate 32 is shown. In addition, a plurality of recesses linearly extending in the Y direction are shown for the unevenness repeated in the X direction in the first metal plate 32. A plurality of flow diffusion protrusions 62 are provided between the first cooling coolant supply port 60 and the plurality of recesses. By the flow diffusion protrusion 62, the cooling refrigerant flowing out from the first cooling refrigerant supply port 60 having a relatively short opening length in the X direction is appropriately diffused in the X direction, and a relatively long range in the X direction. It can be made to flow into each of the concave portions arranged in a plurality.

  The flow diffusion protrusions 62 are arranged on the side of the surface of the first metal plate 32 on which the cooling refrigerant flows, but the same flow diffusion protrusions 64 are supplied with the cooling refrigerant on the first metal plate 32. It is also arranged on the surface behind the surface. The flow diffusion protrusion 64 has a function of appropriately diffusing the flow of the fuel gas in the X direction on the back side of the first metal plate 32.

  In this way, by properly providing the fluid diffusion protrusion between the fluid supply port and the linear fluid flow path, and between the linear fluid flow path and the fluid discharge port, the comparison is made. Fluid is smoothly introduced from a fluid supply port having an opening in a relatively narrow range into a linear fluid flow path disposed in a relatively wide range, and from the linear fluid flow path disposed in a relatively wide range. It becomes possible to lead the fluid to a fluid outlet having a relatively narrow range of openings.

  As the first metal plates 32 and 33, the second metal plates 34 and 35, and the partition plate 36 having such a structure, a metal thin plate formed by press working or the like can be used. Moreover, the 1st separators 30 and 31 and the 2nd separators 50 and 51 can be formed by mutually joining these with a suitable joining means.

In embodiment which concerns on this invention, it is a figure which shows the structure of a fuel cell stack. In embodiment which concerns on this invention, it is a figure which decomposes | disassembles and shows the basic composition of a fuel cell. In embodiment which concerns on this invention, it is a figure which shows the structure of a separator. In embodiment which concerns on this invention, it is sectional drawing about a part of structure where a fuel cell is repeatedly laminated | stacked. In embodiment which concerns on this invention, it is a figure which shows another structure of a separator. FIG. 7 is a cross-sectional view of a part of a structure in which fuel cells are repeatedly stacked when the configuration of FIG. 6 is used. In embodiment which concerns on this invention, it is a figure explaining a mode that a fluid is poured into the linear fluid flow path from the fluid supply port in a separator.

Explanation of symbols

  10 fuel cell stack, 12, 14 terminal member, 13, 15 terminal, 16 opening, 20, 21 fuel cell, 30, 31 first separator, 32, 33 first metal plate, 34, 35 second metal plate, 36 Partition plate, 50, 51 Separator, 60 Cooling refrigerant supply port, 62, 64 Flow diffusion protrusion.

Claims (3)

A laminate comprising a plurality of unit cells each including an electrolyte membrane, a membrane electrode assembly having an anode electrode and a cathode electrode disposed on both sides of the electrolyte membrane, and a pair of separators sandwiching the membrane electrode assembly is provided. In the fuel cell stack,
At least one separator is
Concave portions and convex portions are formed alternately and repeatedly repeated a plurality of times, and the top portions of the respective convex portions are in contact with the anode side electrodes, respectively, between the concave portions between the adjacent convex portions and the anode side electrodes. An anode side metal plate forming a fuel gas flow path;
Concave portions and convex portions are formed alternately and repeatedly repeated a plurality of times, and each convex portion abuts on the cathode side electrode, and an oxidizing gas is formed between the concave portion and the cathode side electrode between adjacent convex portions. A cathode-side metal plate that forms a flow path;
Provided between the anode-side metal plate and the cathode-side metal plate, one surface is in contact with the bottom of each recess in the anode-side metal plate, and the other surface is in contact with the bottom of each recess in the cathode-side metal plate. Each of the partition plates is in contact with each other, and a space between adjacent contact portions of the anode side metal plate is formed as a plurality of first coolant channels through which the coolant flows in the first direction, and the contact side adjacent to the cathode side metal plate is formed. A partition plate that forms a plurality of second refrigerant flow paths through which the refrigerant flows in a second direction opposite to the first direction in the space between the contact parts;
Including
The plurality of first refrigerant flow paths are formed in a linear shape from one refrigerant first supply port to one refrigerant first discharge port and are connected in parallel to each other,
The plurality of second refrigerant flow paths are independent of the refrigerant first supply port and the refrigerant first discharge port from one refrigerant second supply port provided independently of the refrigerant first supply port and the refrigerant first discharge port. A fuel cell stack, wherein the fuel cell stack is formed in a straight line shape and connected in parallel to one refrigerant second discharge port provided. The fuel cell stack according to claim 1, wherein
The position of the contact portion of the anode side metal plate on one side of the partition plate is the same as the position of the contact portion of the cathode side metal plate on the other side of the partition plate with the partition plate in between. The fuel cell stack, wherein the first refrigerant channel and the second refrigerant channel are arranged so that the refrigerant flows in the opposite directions to the same position with the partition plate interposed therebetween. The fuel cell stack according to claim 1, wherein
The position of the contact portion of the anode side metal plate on the one side surface of the partition plate is the position of the contact portion of the cathode side metal plate on the other side surface of the partition plate, and the position of the concave portion and the convex portion across the partition plate. The first refrigerant flow path and the second refrigerant flow path are shifted by a half pitch of the concavo-convex pitch with the partition plate interposed therebetween so that the refrigerant flows in opposite directions. A fuel cell stack, wherein

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