JP2004273264A - Fuel-cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase outputs by stacking cell units each of which comprises a plurality of generating parts arranged in a plane and to cool the generating parts well using a simple and compact constitution. <P>SOLUTION: A plurality of cell units 14 are stacked in the direction of arrow A and enclosed in a casing 12. The cell unit 14 includes an MEA unit 16 and electrically insulating first and second separators 17a, 17b sandwiching the MEA unit 16. The second separator 17b is provided with a guide groove 72 for passing a cooling medium along plane direction. The stacked cell units 14 are enclosed in the casing 12, whereby a cooling medium supply passage 74a and a cooling medium discharge passage 74b integrally communicated with the guide groove 72 of each cell unit 14 are formed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuel cell stack including a cell unit in which a plurality of power generation units sandwiching an electrolyte between an anode electrode and a cathode electrode are arranged in a plane.
[0002]
[Prior art]
Generally, a polymer electrolyte fuel cell employs an electrolyte membrane (electrolyte) composed of a polymer ion exchange membrane (cation exchange membrane). On both sides of the electrolyte membrane, an electrolyte membrane / electrode structure (power generation unit) provided with an anode electrode and a cathode electrode in which a noble metal-based electrode catalyst layer is bonded to a base material mainly composed of carbon is attached to a separator (bipolar). Plate). Usually, a predetermined number of the unit cells are used as a fuel cell stack by stacking them.
[0003]
In a fuel cell of this type, a fuel gas supplied to the anode side electrode, for example, a gas mainly containing hydrogen (hereinafter, also referred to as a hydrogen-containing gas) is obtained by ionizing hydrogen on an electrode catalyst and passing through an electrolyte. It moves to the cathode side electrode side. The electrons generated during that time are taken out to an external circuit and used as DC electric energy. Since an oxidant gas, for example, a gas mainly containing oxygen or air (hereinafter also referred to as an oxygen-containing gas) is supplied to the cathode side electrode, hydrogen ions, electrons, And oxygen react to produce water.
[0004]
By the way, another fuel cell adopts a planar fuel cell in which a plurality of unit cells are arranged in one or a plurality of rows in a plane, and the unit cells are electrically connected in series. For example, in a planar fuel cell shown in FIG. 10 (see Patent Document 1), air electrodes (cathode electrodes) 2a to 2d and fuel electrodes (anode electrodes) 3a to 3d are opposed to each other with electrolyte layers 1a to 1d interposed therebetween. A plurality of unit cells 4a to 4d are arranged in a plane such that the same poles are arranged on the same plane. The unit cells 4a to 4d are connected by conductive Z-shaped connecting plates 5a to 5c, and the unit cells 4a to 4d are electrically connected in series.
[0005]
Specifically, the Z-shaped connecting plate 5a connects the air electrode 2a of the unit cell 4a and the fuel electrode 3b of the unit cell 4b, and the Z-shaped connecting plate 5b connects the air electrode 2b of the unit cell 4b and the unit cell 4c. The Z-shaped connecting plate 5c connects the air electrode 2c of the unit cell 4c and the fuel electrode 3d of the unit cell 4d. The fuel electrode 3a of the unit cell 4a is connected to the cathode-side current terminal 6a, while the air electrode 2d of the unit cell 4d is connected to the anode-side current terminal 6b.
[0006]
[Patent Document 1]
JP-A-2002-56855 (FIG. 1)
[0007]
[Problems to be solved by the invention]
By the way, when a fuel cell is used as a vehicle fuel cell for an automobile or the like, a fuel cell usually requires 200 to 600 cells per unit from the relationship between operating voltage and current. For this reason, in Patent Document 1 described above, it is desired to configure a fuel cell that obtains a high voltage by connecting a plurality of planar fuel cells in series.
[0008]
At that time, in the fuel cell, the effect of heat generation becomes remarkable by increasing the output, and a cooling structure using liquid is required. However, Patent Document 1 relates to a flat-type fuel cell having a small output, and does not consider this type of cooling structure at all.
[0009]
The present invention is intended to solve this kind of problem. A plurality of power generation units are stacked in a cell unit in a planar shape to increase the output, and the power generation unit has a simple and compact configuration. An object of the present invention is to provide a fuel cell stack that can be cooled well.
[0010]
[Means for Solving the Problems]
In the fuel cell stack according to claim 1 of the present invention, a plurality of power generation units having an electrolyte sandwiched between an anode electrode and a cathode electrode are provided with a cell unit arranged in a plane, and a plurality of the cell units are stacked. And housed in a housing.
[0011]
Then, the cell unit is provided with a pair of electrically insulating separators sandwiching the plurality of power generating units, and at least one of the electrically insulating separators is arranged along a surface direction on a surface opposite to the surface facing the power generating unit. A plurality of guide grooves for flowing a cooling medium are provided. On the other hand, a cooling medium flow path is formed in the housing to communicate integrally with the guide groove of each cell unit.
[0012]
As described above, by using the electrically insulating separator, the separator can be manufactured easily and economically as compared with the metal separator. Further, the guide groove for the cooling medium can be made to have a good electrical insulation structure, and it is not necessary to maintain the insulating property of the cooling medium, and liquid junctions and ground faults can be reliably prevented. Accordingly, a cooling medium dedicated to the fuel cell and a liquid junction prevention device such as an ion exchanger are not required, so that the cooling structure is simplified and the cost is reduced, and periodic maintenance is not required.
[0013]
In particular, it is not necessary to use pure water which has a high insulating property but easily freezes below the freezing point as a cooling medium. Thus, for example, without using alcohol or the like for preventing freezing, it is possible to prevent the electrolyte membrane from deteriorating by oxidation or the like, and it is not necessary to provide an ion elution prevention structure for system components.
[0014]
Moreover, the guide grooves are provided along the surface direction of the electrically insulating separator, and the surface area of the electrically insulating separator is effectively increased, and the cooling efficiency is further improved. In addition, a guide groove can be formed between the electrically insulating separators in a state where the electrically insulating separators of adjacent cell units are in contact with each other. For this reason, when shocks such as vibrations act on the housing, the electrically insulating separators that come into contact with each other have a touch-preventing function, and it is possible to favorably avoid the influence of the shocks on the cell unit. .
[0015]
Furthermore, there is no need to incorporate an individual cooling structure for each cell unit or to surround each cell unit with an individual container, thereby reducing the number of parts and reducing the size and simplification of the entire fuel cell stack. . In addition, each cell unit can be replaced individually and easily, and handling operability is improved satisfactorily.
[0016]
Further, in the fuel cell stack according to claim 2 of the present invention, the cell unit includes a reaction gas supply communication hole and a reaction gas discharge communication hole communicating with each other in the stacking direction, and the reaction gas supply communication hole and the reaction gas communication hole in the housing. A seal member for shutting off the reaction gas discharge passage and the cooling medium flow path is provided. Therefore, the reaction gas and the cooling medium can be reliably sealed in the housing with a simple configuration.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic perspective view illustrating a fuel cell stack 10 according to an embodiment of the present invention.
[0018]
The fuel cell stack 10 includes a housing 12, in which a plurality of cell units 14 are stacked and accommodated in the direction of arrow A. As shown in FIGS. 2 and 3, the cell unit 14 includes a MEA (Membrane and Electrode Assembly) unit 16, and first and second separators 17 a and 17 b disposed on both sides of the MEA unit 16.
[0019]
A fuel gas inlet communication hole 18a for supplying a fuel gas, for example, a hydrogen-containing gas, and an oxidizing gas For example, an oxidizing gas inlet communication hole 20a for supplying an oxygen-containing gas is provided on one end side in the arrow C direction. One end of the cell unit 14 in the direction of the arrow B communicates in the direction of the arrow A to communicate with the fuel gas outlet communication hole 18b for discharging the fuel gas and the oxidant gas outlet communication for discharging the oxidant gas. Holes 20b are provided on the other end side in the arrow C direction.
[0020]
The MEA unit 16 includes, for example, a solid polymer electrolyte membrane 22 that is a thin film of a perfluorosulfonic acid polymer. Using the solid polymer electrolyte membrane 22 as a common electrolyte, a plurality of electrolyte membrane / electrode structures (power generation units) 24 (1) to 24 (n) are configured. As shown in FIG. 2, a predetermined number of the electrolyte membrane / electrode structures 24 (1) to 24 (n) are arranged in the direction of arrow B and the direction of arrow C in the plane of the solid polymer electrolyte membrane 22. Provided.
[0021]
As shown in FIG. 3, reinforcing films, for example, silicon films 26a and 26b are provided on both surfaces 22a and 22b of the solid polymer electrolyte membrane 22 in correspondence with portions where electrodes to be described later are not provided. In the solid polymer electrolyte membrane 22, a plurality of holes 27 are formed at predetermined positions (see FIG. 2).
[0022]
The electrolyte membrane / electrode structure 24 (1) includes a cathode-side electrode 28 provided on one surface 22a of the solid polymer electrolyte membrane 22, and an anode-side electrode provided on the other surface 22b of the solid polymer electrolyte membrane 22. 30. The cathode-side electrode 28 and the anode-side electrode 30 are formed by applying porous carbon particles having a platinum alloy supported on the surfaces thereof to the surfaces 22 a and 22 b of the solid polymer electrolyte membrane 22. The cathode-side electrode 28 is provided with a first conductive diffusion layer 32, and the anode-side electrode 30 is provided with a second conductive diffusion layer 34.
[0023]
The electrolyte membrane / electrode structures 24 (2) to 24 (n) have the same configuration as the above-described electrolyte membrane / electrode structure 24 (1), and the same components are denoted by the same reference numerals. Therefore, detailed description thereof is omitted.
[0024]
As shown in FIGS. 4 and 5, the first conductive diffusion layer 32 of the electrolyte membrane / electrode structure 24 (1) is formed from the outer periphery of the cathode electrode 28 to the adjacent electrolyte membrane / electrode structure 24 (2). A first end portion 32a protruding is provided. The second conductive diffusion layer 34 of the electrolyte membrane / electrode structure 24 (2) has a second end 34a projecting from the outer periphery of the anode 30 toward the adjacent electrolyte membrane / electrode structure 24 (1). Provide.
[0025]
The first and second end portions 32a and 34a have a polymerized portion that overlaps with the solid polymer electrolyte membrane 22 and the silicon films 26a and 26b interposed therebetween. It is electrically connected by a conductive member that penetrates the silicon films 26a and 26b, for example, a conductive rivet member 36. The rivet member 36 has a sealing material 38 applied to the outer peripheral surface thereof, and airtightly shuts off both surfaces of the solid polymer electrolyte membrane 22. The rivet member 36 is subjected to caulking to form flange portions 36a and 36b on the first and second end portions 32a and 34a.
[0026]
As shown in FIG. 3 and FIG. 5, the first conductive diffusion layer 32 of the electrolyte membrane / electrode structure 24 (2) projects toward the adjacent electrolyte membrane / electrode structure 24 (3). An end 32a is provided. The second conductive diffusion layer 34 of the electrolyte membrane / electrode structure 24 (3) has a second end 34a protruding toward the adjacent electrolyte membrane / electrode structure 24 (2). The overlapping portions of the first and second ends 32a and 34a are electrically connected via a rivet member 36. Hereinafter, the electrolyte membrane / electrode structures 24 (3) to 24 (n) are similarly electrically connected in series.
[0027]
The first and second separators 17a and 17b are made of a non-conductive heat conductive material reinforced plastic molded body. As shown in FIGS. 2 and 6, a supply manifold 40 is formed on a surface 39a of the first separator 17a facing the MEA unit 16 so as to extend in the direction of arrow B at one end in the direction of arrow C. A discharge manifold 42 is formed at the other end in the direction C in the direction of the arrow B. The supply manifold 40 has a concave shape and communicates with the fuel gas inlet communication hole 18a. The discharge manifold 42 also has a concave shape, and communicates with the fuel gas outlet communication hole 18b.
[0028]
A fuel gas flow path 44 for supplying fuel gas from the supply manifold 40 to the discharge manifold 42 is formed on the surface 39a. The fuel gas flow path 44 has a plurality of flow grooves extending in the direction of arrow C and communicating with the supply manifold 40 and the discharge manifold 42. A rectangular groove 46 for accommodating each anode 30 of the electrolyte membrane / electrode structure 24 (1) to 24 (n) is formed on the surface 39a, and a plurality of screws with seals are provided at predetermined positions. A hole 48 is formed.
[0029]
On the surface 39a, a seal 50 is provided by baking or the like to cover the fuel gas inlet communication hole 18a, the fuel gas outlet communication hole 18b, the supply manifold 40, the discharge manifold 42, and the fuel gas flow path 44. The first separator 17a is provided such that the-(minus) terminal 52 can be connected to the anode 30 of the electrolyte membrane / electrode structure 24 (1). The seal member 53a is fixed from the surface 39b opposite to the surface 39a to both sides. The seal member 53a is provided in the vicinity of the fuel gas inlet communication hole 18a, the oxidant gas inlet communication hole 20a, the oxidant gas outlet communication hole 20b, and the fuel gas outlet communication hole 18b. It has a function of shutting off from a cooling medium passage described later.
[0030]
As shown in FIG. 7, on a surface 55a of the second separator 17b facing the MEA unit 16, a supply manifold 54 communicating with the oxidizing gas inlet communication hole 20a and extending in the direction of arrow B, and an oxidizing gas outlet A discharge manifold 56 communicating with the communication hole 20b and extending in the direction of arrow B is formed. The supply manifold 54 and the discharge manifold 56 communicate with each other via an oxidizing gas flow path 58 having a plurality of flow grooves extending in the arrow C direction.
[0031]
On the surface 55a, a seal 59 is provided by baking or the like to cover the oxidizing gas inlet communication hole 20a, the oxidizing gas outlet communication hole 20b, the supply manifold 54, the discharge manifold 56, and the oxidizing gas flow path 58.
[0032]
On the surface 55a, rectangular grooves 60 are formed corresponding to the respective cathode-side electrodes 28 of the electrolyte membrane / electrode structures 24 (1) to 24 (n). In the surface 55a, a hole 62 with a seal is formed at a predetermined position. As shown in FIG. 2, the hole 62 with the seal penetrates the hole 27 of the MEA unit 16 to form the second separator 17b. A fastening screw 64 is screwed into the screw hole 48 with the seal, and the cell unit 14 is integrated. The second separator 17b is provided with a + (plus) terminal 66 that can be connected to the cathode 28 of the electrolyte membrane / electrode structure 24 (n).
[0033]
As shown in FIG. 2, ribs 70 are provided on a surface 55 b of the second separator 17 b opposite to the surface 55 a so as to extend in the direction of arrow C, and the second separator 17 b is provided between the ribs 70. A plurality of guide grooves 72 for flowing the cooling medium are formed along the surface direction.
[0034]
A seal member 53b is provided on the surface 55b near the fuel gas inlet communication hole 18a, the oxidizing gas inlet communication hole 20a, the oxidizing gas outlet communication hole 20b, and the fuel gas outlet communication hole 18b. This seal member 53b is provided from the surface 55b to the side surface of the second separator 17b. When the first and second separators 17a and 17b are overlapped, a sealing structure is formed around the cell unit 14 by the sealing members 53a and 53b.
[0035]
As shown in FIG. 1, the housing 12 is formed of an aluminum outer plate resin, and is integrally formed with a guide groove 72 of each cell unit 14 in a chamber 12 a in which a plurality of cell units 14 are stacked and accommodated. A cooling medium supply path (cooling medium flow path) 74a and a cooling medium discharge path (cooling medium flow path) 74b are provided.
[0036]
As shown in FIGS. 1 and 8, the cooling medium supply path 74 a is formed between the inner wall surface of the housing 12 and the end faces in the direction of arrow C <b> 1 of the stacked cell units 14, and the cooling medium discharge path 74b is formed between the inner wall surface of the housing 12 and the end surface of the cell unit 14 in the direction of arrow C2. On the lower surface of the housing 12, a cooling medium inlet 76a is formed at the edge of the arrow C1 direction in communication with the cooling medium supply path 74a, while on the upper surface of the housing 12, the cooling medium inlet 76a is formed at the edge of the arrow C2 direction. A cooling medium outlet 76b is formed to communicate with the cooling medium discharge passage 74b.
[0037]
As shown in FIG. 1, by stacking a plurality of cell units 14 in the direction of arrow A, a seal structure including seal members 53 a and 53 b provided in each cell unit 14 is stacked together, Is shut off by the chamber 12a and the reaction gas chamber 12b. A housing cover 78 is provided in the reaction gas chamber 12b.
[0038]
As shown in FIG. 9, communication port connecting spacers 80a and 80b are interposed between the cell units 14. The spacer 80a has a fuel gas inlet communication hole 18a and an oxidant gas inlet communication hole 20a, and the spacer 80b has an oxidant gas outlet communication hole 20b and a fuel gas outlet communication hole 18b. (See FIG. 2).
[0039]
The terminal 52 of each cell unit 14 is integrally fastened by a terminal fastening bolt 82a, while the terminal 66 is integrally fastened by a terminal fastening bolt 82b.
[0040]
The operation of manufacturing the fuel cell stack 10 configured as described above will be described below.
[0041]
First, as shown in FIG. 2, in a state where the MEA unit 16 is sandwiched between the first and second separators 17a and 17b, a fastening screw 64 is inserted into the hole 62 with a seal. Is screwed into the screw hole 48 with the seal. Thereby, the first separator 17a, the MEA unit 16 and the second separator 17b are integrally fastened and fixed, and the cell unit 14 is obtained.
[0042]
Therefore, the cell units 14 are stacked in the direction of arrow A, and spacers 80a and 80b are interposed. After a predetermined number of the cell units 14 are stacked, the terminal fastening bolts 82a and 82b penetrate the terminals 52 and 66, respectively, and the terminals 52 and the terminals 66 are integrally fastened. As shown in FIG. 1, the stacked body is disposed in the housing 12 so that the sealing members 53 a and 53 b of each cell unit 14 adhere to each other, and the chamber 12 a and the reaction gas chamber 12 b Are cut off from each other.
[0043]
In the chamber 12a, a stacked body of the cell units 14 is accommodated, so that a cooling medium supply path 74a communicating with a cooling medium inlet 76a and a cooling medium discharge path 74b communicating with a cooling medium outlet 76b are formed. The cooling medium supply path 74a and the cooling medium discharge path 74b are integrally connected to the guide grooves 72 of each cell unit 14.
[0044]
Next, the operation of the fuel cell stack 10 will be described.
[0045]
First, as shown in FIG. 1, an oxidizing gas such as an oxygen-containing gas is supplied to the oxidizing gas inlet communication hole 20a in the housing 12, and a hydrogen-containing gas or the like is supplied to the fuel gas inlet communication hole 18a. Fuel gas is supplied. In addition, a cooling medium, which is a cooling liquid, is supplied to the cooling medium inlet 76a.
[0046]
For this reason, the oxidizing gas is once introduced into the supply manifold 54 formed on the surface 55a of the second separator 17b and then supplied to the oxidizing gas flow path 58 as shown in FIG. The oxidizing gas moves in the direction of arrow C via the plurality of flow grooves, and is supplied to the respective cathode electrodes 28 of the electrolyte membrane / electrode structures 24 (1) to 24 (n). Unused oxidant gas is discharged from the discharge manifold 56 to the oxidant gas outlet communication hole 20b.
[0047]
On the other hand, as shown in FIG. 6, the fuel gas is introduced into a supply manifold 40 formed on the surface 39a of the first separator 17a, and is supplied to a fuel gas flow path 44 communicating with the supply manifold 40. In the fuel gas flow path 44, the fuel gas is supplied to each of the anode electrodes 30 of the electrolyte membrane / electrode structures 24 (1) to 24 (n) while moving in the direction of arrow C. Unused fuel gas is discharged from the fuel gas outlet communication hole 18b through the discharge manifold 42.
[0048]
Accordingly, in the electrolyte membrane / electrode structures 24 (1) to 24 (n), the oxidizing gas supplied to each cathode 28 and the fuel gas supplied to each anode 30 are electrochemically reacted. It is consumed and power is generated. Thus, the electrolyte membrane / electrode structures 24 (1) to 24 (n), which are all power generation units, are electrically connected in series between the terminals 52 and 66, and a desired voltage can be generated. .
[0049]
In this case, in this embodiment, each cell unit 14 includes the MEA unit 16 and the first and second separators 17a and 17b that sandwich the MEA unit 16, and the first and second separators 17a and 17b. Is constituted by an electrically insulating separator. For this reason, the first and second separators 17a and 17b can be manufactured more easily and economically as compared with those made of a metal separator.
[0050]
Further, a guide groove 72 for a cooling medium is provided in the second separator 17b, and this guide groove 72 can be made to have an excellent electrical insulation structure. For this reason, since it is not necessary to maintain the insulating property of the cooling medium, it is possible to reliably prevent a liquid junction, a ground fault, and the like. Therefore, a liquid-junction prevention device such as a fuel cell-dedicated cooling medium or an ion exchanger is not required, and the effect of simplifying the cooling structure and reducing costs can be obtained.
[0051]
In particular, it is not necessary to use pure water that easily freezes below the freezing point as a cooling medium. For example, without using alcohol or the like for preventing freezing, it is possible to prevent deterioration of the solid polymer electrolyte membrane 22 such as oxidation. In addition to this, an ion elution preventing structure is not required.
[0052]
Moreover, the guide groove 72 is provided along the surface direction of the second separator 17b, and there is an advantage that the surface area of the second separator 17b is effectively increased, and the cooling efficiency is further improved. In addition, a guide groove 72 for supplying a cooling medium is formed between the first and second separators 17a and 17b in a state where the first and second separators 17a and 17b of the adjacent cell unit 14 are in contact with each other. . Thus, for example, when an impact such as vibration is applied to the housing 12, the first and second separators 17a and 17b that come into contact with each other have a function of preventing touch, and the influence of the impact on the cell unit 14 is reduced. Good avoidance is possible.
[0053]
Furthermore, in the present embodiment, only a predetermined number of cell units 14 are stacked and accommodated in the housing 12, and the cooling medium supply between the end surface of the cell units 14 and the inner wall surface of the housing 12. A path 74a and a cooling medium discharge path 74b are formed. Therefore, there is no need to incorporate a separate cooling structure for each cell unit 14 or to surround each cell unit 14 with a separate container, and to reduce the number of parts to reduce the size and simplification of the entire fuel cell stack 10. Is achieved. In addition, each cell unit 14 can be individually and easily replaced, and there is an effect that handling workability is favorably improved.
[0054]
【The invention's effect】
In the fuel cell stack according to the present invention, by providing the electrically insulating separator with the guide groove for the cooling medium, the guide groove can be made to have a good electrical insulation structure, and liquid junctions, ground faults, and the like can be reliably prevented. Can be prevented. Accordingly, a cooling medium dedicated to the fuel cell and a liquid junction prevention device such as an ion exchanger are not required, so that the cooling structure is simplified and the cost is reduced, and periodic maintenance is not required.
[0055]
In particular, it is not necessary to use pure water which has a high insulating property but easily freezes below the freezing point as a cooling medium. Thus, for example, without using alcohol or the like for preventing freezing, it is possible to prevent the electrolyte membrane from deteriorating by oxidation or the like, and it is not necessary to provide an ion elution prevention structure for system components.
[0056]
Furthermore, the guide groove is provided along the surface direction of the electrically insulating separator, and the surface area of the electrically insulating separator is effectively increased, and the cooling efficiency is further improved. Moreover, there is no need to incorporate an individual cooling structure for each cell unit or to surround each cell unit with an individual container, and the number of parts can be reduced, and the entire fuel cell stack can be reduced in size and simplified. . Furthermore, each cell unit is easily and individually exchanged, and the handling workability is improved satisfactorily.
[Brief description of the drawings]
FIG. 1 is a schematic perspective explanatory view of a fuel cell stack according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a main part of the cell unit.
FIG. 3 is an explanatory sectional view of a main part of the cell unit.
FIG. 4 is an explanatory diagram showing a connection state of MEA units constituting the cell unit.
FIG. 5 is a front view of the MEA unit.
FIG. 6 is a front view of a first separator constituting the cell unit.
FIG. 7 is a front view of a second separator constituting the cell unit.
FIG. 8 is an explanatory diagram of a cooling medium supply path and a cooling medium discharge path in a housing constituting the fuel cell stack.
FIG. 9 is a partial perspective explanatory view of the stacked cell units.
FIG. 10 is an explanatory sectional view of a main part of a flat fuel cell according to Patent Document 1.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Housing 14 ... Cell unit 16 ... MEA unit 17a, 17b ... Separator 22 ... Solid polymer electrolyte membrane 24 (1) -24 (n) ... Electrolyte membrane and electrode structure 28 ... Cathode side electrode 30 Anode-side electrodes 53a, 53b Seal member 72 Guide groove 74a Coolant supply path 74b Coolant discharge path 76a Coolant inlet 76b Coolant outlet 80a, 80b Spacer

Claims (2)

A plurality of power generation units sandwiching the electrolyte between the anode side electrode and the cathode side electrode, a fuel cell stack including a cell unit arranged in a plane,
A housing for housing a plurality of the cell units in a stacked manner,
The cell unit is provided with a pair of electrically insulating separators sandwiching a plurality of the power generating units, and at least one of the electrically insulating separators is arranged along a surface direction on a surface opposite to a surface facing the power generating unit. And providing a plurality of guide grooves for flowing the cooling medium
A fuel cell stack, wherein a cooling medium flow path integrally communicating with the guide groove of each cell unit is formed in the housing. 2. The fuel cell stack according to claim 1, wherein the cell unit includes a reaction gas supply communication hole and a reaction gas discharge communication hole communicating with each other in the stacking direction.
A fuel cell stack, wherein a seal member for shutting off the reaction gas supply passage and the reaction gas discharge passage and the cooling medium passage is provided in the housing.

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