JP2002100380A - Fuel cell and fuel cell stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to attain a miniaturization while carrying out distribution and supply of a desired fluid uniformly in the distribution way prepared in a face of a separator in a fuel cell. SOLUTION: While arranging the 1st separator 46 that is terminated in near a supplying hole part 50a for fuel gas, and 1st fuel-gas distributing slots 56a to 56d along with a surface 46a, a 1st seal component 42 is arranged in the above surface 46a of the 1st separator 46. A 1st flow connecting part 66a for enabling the distribution of the fuel gas between the supplying hole part 50a for fuel gas and the 1st fuel-gas distributing slots 56a to 56d, is prepared in the 1st seal component 42. Then, the flow velocity of the fuel gas is made decrease by passing the flow connecting part 66a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell and a fuel cell having a unitary power generation cell having a joined body formed by sandwiching an electrolyte between an anode electrode and a cathode side electrode, and the joined body sandwiched between separators. Related to a battery stack.

[0002]

2. Description of the Related Art For example, a phosphoric acid fuel cell (PAFC)
Is a joint (electrolyte / electrode) composed of an anode side electrode and a cathode side electrode mainly composed of carbon arranged on both sides of an electrolyte layer in which concentrated phosphoric acid is impregnated in porous silicon carbide (matrix). A unit power generation cell configured by sandwiching the bonded body) with a separator (bipolar plate) is provided. Usually, a predetermined number of the unit power generation cells are stacked and used as a fuel cell stack.

On the other hand, polymer electrolyte fuel cells (PEFC)
Employs an electrolyte membrane composed of a polymer ion exchange membrane (cation exchange membrane). Similarly, by stacking a predetermined number of unit power generation cells each having a joined body composed of the electrolyte membrane and separators, the fuel Used as a battery stack.

In this type of fuel cell, a fuel gas supplied to an anode side electrode, for example, a gas mainly containing hydrogen (hereinafter also referred to as a hydrogen-containing gas) is formed by ionizing hydrogen on a catalyst electrode, and To the cathode side via the. 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.

In a fuel cell stack, usually,
In order to supply a fuel gas and an oxidizing gas to each unit power generation cell, and a cooling medium as needed, an internal manifold incorporated inside the fuel cell stack and an externally mounted fuel cell stack are provided. An external manifold is employed. As a fuel cell stack having such an internal manifold, for example, US Pat.
A technique disclosed in Japanese Patent Application Publication No. 108,849 is known.

More specifically, as shown in FIG. 6, a plurality of flow grooves 2 are provided in a meandering manner on one surface 1a of a separator 1, which is a flow plate, and the flow grooves 2
Has an inlet end 3 and an outlet end 4. The inlet end 3 and the outlet end 4 communicate with a fluid supply hole 5 and a fluid discharge hole 6 penetrating in the thickness direction of the separator 1.

The above-mentioned separator 1 is incorporated in a unit power generation cell 7 as shown in FIG. 7, for example. The unit power generation cell 7 includes an electrolyte electrode assembly 8,
The separator 1 is disposed in a state where the sealing members 9 are interposed on both surfaces of the electrolyte electrode assembly 8. At this time, the fluid supply holes 5 and the fluid discharge holes 6 of the separator 1 constitute a fluid supply internal manifold 5a and a fluid discharge internal manifold 6a extending in the stacking direction of the unit power generation cells 7.

Therefore, the fluid supply internal manifold 5a
When a reaction gas, for example, a fuel gas is introduced into the flow channel 2 of the separator 1 from the introduction end 3 communicating with the fluid supply hole 5 constituting the fluid supply internal manifold 5a, A branch flow occurs. The branch flow of the fuel gas moves while meandering along the flow channel 2, and the hydrogen gas in the fuel gas is supplied to one electrode (anode-side electrode) constituting the electrolyte electrode assembly 8. .

Unused fuel gas is discharged from the outlet end 4 constituting the flow channel 2 to the fluid discharge hole 6 and discharged from the unit power generation cell 7 along the fluid discharge internal manifold 6a. become. Similarly, an oxidizing gas is supplied to the other electrode (cathode-side electrode) of the electrolyte / electrode assembly 8, whereby power is generated in the unit power generation cell 7.

[0010]

However, in the above-described prior art, a branch flow is generated directly from the main flow of the fuel gas flowing through the fluid supply internal manifold 5a into the flow channel 2 of the separator 1. Each time the main flow is divided into the flow channel 2 of each separator 1, a change is easily caused in the flow of the main flow. For this reason, in the flow channel 2 of the separator 1 that constitutes the unit power generation cells 7 stacked on the downstream side, the branching of the fuel gas may be unstable.

In particular, when the main flow rate of the fuel gas introduced into the fluid supply internal manifold 5a is high, the above phenomenon becomes remarkable. Therefore, the fuel gas cannot be uniformly distributed to the unit power generation cells 7 stacked in the fuel cell stack, and it becomes difficult to uniformly distribute and supply the fuel gas to each of the flow grooves 2. A problem that power generation performance becomes unstable has been pointed out.

Further, in the plurality of flow grooves 2 formed in the plane of the separator 1, the inflow speed in the flow grooves 2 provided on the end side in the arrangement direction decreases, while the flow rate in the center in the arrangement direction decreases. The inflow speed in the flow channel 2 provided on the side is easily increased. As a result, the fuel gas cannot be distributed and supplied to the plurality of flow grooves 2 uniformly, and there is a problem that the output of the fuel cell stack decreases.

The present invention solves this kind of problem, and uniformly supplies a desired fluid to a flow passage provided along the plane of the separator and effectively reduces the thickness of the separator. It is an object to provide a fuel cell that can be made thinner.

Further, the present invention provides a fuel cell stack capable of smoothly and uniformly supplying a desired fluid to a flow passage in each unit power generation cell to be stacked to improve output and effectively reducing the size. The purpose is to provide.

[0015]

In a fuel cell according to a first aspect of the present invention, a fluid hole through which a fluid containing at least one of a fuel gas, an oxidizing gas and a cooling medium flows through a separator. And a flow passage that supplies the fluid along the plane of the separator and terminates near the fluid hole. A flow path member is provided on the surface of the separator to allow fluid to flow between the fluid hole and the flow passage.

For this reason, when the fluid introduced into the fluid hole of the separator passes through the flow path member and is introduced into the flow passage provided in the plane of the separator, the flow direction is changed to the thickness of the separator. It will be changed along the direction. This is because the flow passage of the separator does not directly communicate with the fluid hole, and a step in the thickness direction occurs between the end of the communication passage and the fluid hole. Thus, when the fluid is introduced into the flow passage from the fluid hole, the flow velocity is reduced and uniformized, and there is no difference in the inflow speed depending on the position of the flow passage, and the fluid flows into each flow passage. Can be uniformly distributed and supplied.

Further, in the fuel cell according to claim 2 of the present invention, the flow path member is a seal member interposed between the separator and the joined body, and the seal member has a fluid hole and a flow passage. A communication part is provided for communication. Therefore, it is not necessary to consider strength and rigidity when providing the stepped portion in the plane of the separator, and it is possible to easily set the separator to a desired thickness, for example, a thin wall.

Further, in the fuel cell stack according to the third aspect of the present invention, the fluid flows through the separator in the thickness direction, and the fluid hole constituting the internal manifold extending in the stacking direction. And a flow passage that supplies the fluid along the plane of the separator and terminates near the fluid hole. A flow path member is provided on the surface of the separator to allow fluid to flow between the fluid hole and the flow passage.

Therefore, the fluid introduced into the fluid hole is supplied to the flow passage in a state where the flow direction is variously changed before reaching the flow passage, the flow velocity is reduced, and the fluid is made uniform. Become. At that time, a change in flow does not occur in the main flow of the fluid flowing through the internal manifold, the fluid can be uniformly distributed to the unit power generation cells stacked, and the output of the fuel cell stack decreases. Can be reliably prevented.

Further, in the fuel cell stack according to claim 4 of the present invention, the flow path member is a seal member interposed between the separator and the joined body, and the seal member has a fluid hole and a communication passage. And a communication portion that communicates with. Accordingly, the size of the separator in the thickness direction does not increase, and the entire fuel cell stack can be effectively reduced in size.

[0021]

FIG. 1 is a schematic perspective view of a fuel cell stack 10 according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a main part of the fuel cell stack 10.

The fuel cell stack 10 includes unit power generation cells (fuel cells) 14, and a predetermined number of the unit power generation cells 14 are stacked in the direction of arrow A. Current collecting electrodes 16a and 16b which are electrically connected integrally are arranged, and a predetermined number of temperature adjusting cells 18 are interposed between the current collecting electrodes 16a and 16b. For example, a load (not shown) such as a motor is connected to the current collecting electrodes 16a and 16b.

The end plates 20a, 20b are provided outside the current collecting electrodes 16a, 16b via insulating sheets (not shown).
b, and the end plates 20a, 20b are tightened by tie rods (not shown), so that the unit power generation cell 14, the current collecting electrodes 16a, 16b, and the temperature adjusting cell 18 are integrally tightened and held in the direction of arrow A. Is done.

The fuel cell stack 10 constitutes an internal manifold, and has both ends in the lateral direction (in the direction of arrow B).
The fuel gas supply manifold 24a, the oxidizing gas supply manifold 26a, the cooling medium supply manifold 28a, and the cooling medium discharge manifold 2 extend in the stacking direction.
8b, an oxidant gas discharge manifold 26b, and a fuel gas discharge manifold 24b.

The unit power generation cell 14 is a phosphoric acid fuel cell (PAFC) whose operating (operating) temperature is set at around 120 ° C. to 200 ° C., or a solid fuel cell whose operating (operating) temperature is set at around 80 ° C. It is a polymer fuel cell (PEFC), and as shown in FIG. 2, in the case of a phosphoric acid fuel cell,
Phosphoric acid is held in a porous material made of an inorganic material such as SiC or a basic polymer, particularly a polybenzimidazole matrix, or in the case of a polymer electrolyte fuel cell, polytetrafluoroethylene sulfonic acid is used. A cathode 36 and an anode 34 are provided on both sides of an electrolyte (electrolyte layer) 30 impregnated with water. For example, a gas diffusion layer made of porous carbon paper, which is a porous layer, is provided.

The joint 36 is integrally formed with a frame-shaped film 38. The frame-shaped film 38 has an opening 40 smaller than the size of the electrolyte 30. The electrolyte 30 and the cathode-side electrode 32 are arranged on one surface of the frame-shaped film 38, and the frame-shaped film 38 is The anode electrode 34 is arranged on the other surface of the film 38, and these are integrally fixed (see FIG. 3).

Various materials are applied to the frame-shaped film 38. When phosphoric acid is used as the electrolyte 30, a heat-resistant resin film such as a polyimide film is used. When a material obtained by impregnating tetrafluoroethylene sulfonic acid with water is used, a thermoplastic elastomer sheet or the like is used.

The frame-shaped film 3 is connected to the anode 34.
8, the electrolyte 30 and the cathode-side electrode 32 are laminated in this order, and the joined body 36 is integrally formed by hot pressing or cold pressing. The unit power generation cell 14 is configured by disposing the first and second separators 46 and 48 on both sides of the joined body 36 via the first and second seal members 42 and 44.

The frame-shaped film 38 and the first and second separators 46 and 48 are set in a rectangular shape which is long in the horizontal direction (the direction of arrow B). A fuel gas supply hole 50a and an oxidant gas supply hole 52a that constitute the gas supply manifold 24a and the oxidant gas supply manifold 26a are formed.

At the substantially center of both ends of the frame-shaped film 38 and the first and second separators 46 and 48 in the horizontal direction, a cooling medium supply hole 54a which forms a cooling medium supply manifold 28a and a cooling medium discharge manifold 28b. And a cooling medium discharge hole 54b is provided,
An oxidizing gas discharge hole 52b and a fuel gas discharge hole 50b that constitute the oxidizing gas discharge manifold 26b and the fuel gas discharge manifold 24b are provided below the both ends in the width direction.

The anode 34 of the first separator 46
A plurality of, for example, four first fuel gas flow grooves (flow passages) 56a to 56d that terminate in the vicinity of the fuel gas supply hole 50a are provided on the surface 46a facing the fuel gas supply hole 50a. The first fuel gas flow grooves 56a to 56d extend in the horizontal direction (arrow B direction) in the surface 46a and then bend downward (mean arrow C) to meander. The two fuel gas flow grooves (flow paths) 58a and 58b merge. The second fuel gas flow grooves 58a and 58b are
It terminates near the fuel gas discharge hole 50b.

As shown in FIG. 4, on the surface 48a of the second separator 48 facing the cathode electrode 32, a plurality of, for example, four, ends near the oxidant gas supply hole 52a. 1 Oxidizing gas flow grooves (flow paths) 60a to 6
0d is formed. The first oxidant gas flow grooves 60a-
60d is a horizontal direction (arrow B direction) within the surface 48a.
Is formed along this surface 48a while meandering,
On the lower side, two second oxidizing gas flow grooves (flow paths) 6
2a and 62b, and the second oxidizing gas flow groove 62
a, 62b terminate near the oxidant gas discharge hole 52b.

The first and second separators 46 and 48 are
It is made of a conductive material, for example, a dense carbon material or metal. First and second seal members 42, 44
Is formed of a heat-resistant resin having an appropriate rigidity such as polytetrafluoroethylene.

As shown in FIG. 2, the first sealing member 42
The fuel gas supply hole 50a and the first fuel gas flow groove are provided in seal portions 64a and 64b for orbiting the fuel gas supply hole 50a and the fuel gas discharge hole 50b of the first separator 46. A communication portion 66a that communicates 56a to 56d and a communication portion 66b that communicates the fuel gas discharge hole 50b and the second fuel gas circulation grooves 58a and 58b are provided.

Similarly, the second seal member 44 is provided with an oxidizing gas supply hole 52 provided in the second separator 48.
a and the oxidizing gas supply hole 5b are provided in seal portions 68a and 68b for sealing the oxidizing gas discharge hole portion 52b.
A communication portion 70a that communicates the second oxidant gas flow grooves 60a to 60d with a communication portion 70a that communicates the oxidant gas discharge hole portion 52b and the second oxidant gas flow grooves 62a and 62b. Provided.

The communicating portions 66a, 66b, 70a and 70
b is formed by cutting the first and second seal members 42 and 44 to a predetermined depth in the thickness direction, and includes first fuel gas flow grooves 56a to 56d and a second fuel gas flow groove 58.
a, 58b, the first oxidizing gas flow grooves 60a to 60d, and the second oxidizing gas flowing grooves 62a, 62b are each set to a chamber type that integrally communicates with each other.

The fuel cell stack 1 configured as described above
The operation of 0 will be described below.

In the fuel cell stack 10, a fuel gas such as a hydrogen-containing gas is supplied from a fuel gas supply manifold 24a, and an oxidizing gas supply manifold 26 is supplied.
Air or an oxidizing gas which is an oxygen-containing gas is supplied from a, and a cooling medium such as pure water, ethylene glycol or oil is supplied from a cooling medium supply manifold 28a.

As shown in FIG. 3, the fuel gas introduced into the fuel gas supply manifold 24a is supplied to each unit power generation cell 1
The first sealing member 4 is supplied to the fuel gas supply hole 50a of the first separator 46 constituting the first sealing member 4 and partially diverted.
The second fuel gas is introduced into the first fuel gas flow grooves 56a to 56d provided on the surface 46a of the first separator 46 through the communication portion 66a formed in the second separator 2. First fuel gas flow groove 56
a-56d are supplied to the first separator 4
6 in the direction of gravity while meandering along the direction of arrow B.

At this time, while the hydrogen gas in the fuel gas is supplied to the anode 34 constituting the joined body 36,
Unused fuel gas is supplied to the second fuel gas flow grooves 58a, 58
After being supplied to the fuel gas discharge manifold b, the fuel gas is discharged from the fuel gas discharge hole 50b through the communication portion 66b provided in the first seal member.

Similarly, the oxidizing gas supply manifold 26
a part of the oxidizing gas supplied to each unit power generation cell 1
The communication portion 7 formed in the second seal member 44 from the oxidant gas supply hole portion 52a of the second separator 48 constituting the second seal member 44
Oa is introduced into the first oxidizing gas flow grooves 60a to 60d provided on the surface 48a side of the second separator 48. As shown in FIG. 4, the oxidizing gas is supplied to the second separator 4 via the first oxidizing gas flow grooves 60a to 60d.
8 and moves in the direction of gravity while meandering in the direction of arrow B along the surface 48a.

At this time, the oxygen gas in the oxidizing gas is supplied to the cathode 32 constituting the joined body 36, while the unused oxidizing gas is supplied to the second oxidizing gas flow groove 62.
a, 62b, are discharged to the oxidizing gas discharge hole 52b through the communicating portion 70b of the second seal member 44, and are led out to the oxidizing gas discharge manifold 26b.

Similarly, the cooling medium introduced into the cooling medium supply manifold 28a is sent to the temperature adjusting cell 18, and is supplied in the surface direction through a communicating portion provided on a sealing member (not shown). Then, after cooling the unit power generation cell 14, the cooling medium is discharged to the cooling medium discharge manifold 28b through the communication section.

In this case, in the first embodiment, as shown in FIGS. 2 and 3, in the first separator 46, the fuel gas supply hole 50a and the first fuel gas flow grooves 56a to 56a.
56d does not directly communicate with the first seal member 42 disposed on the surface 46a of the first separator 46.
A communication portion 66a for communicating the fuel gas supply hole 50a with the first fuel gas flow grooves 56a to 56d.
Is provided. Therefore, as shown in FIG. 3, a part of the fuel gas introduced into the fuel gas supply manifold 24 a is transferred from the communication portion 66 a of the first seal member 42 constituting each unit power generation cell 14 to the first fuel gas flow grooves 56 a to 56 a. When being sent to 56d, the fuel gas is introduced into the first fuel gas flow grooves 56a to 56d so as to bypass along the thickness direction of the first separator 46.

Therefore, the fuel gas supply manifold 24
The fuel gas diverted from the main stream of the fuel gas flowing through a
First, the communication portion 66a formed in the first seal member 42,
That is, once introduced into the gas chamber, the flow velocity of the fuel gas is reduced, and the flow velocity is made uniform.

Next, the flow direction of the fuel gas is changed twice from the communicating portion 66a by 90 ° so that the flow velocity of the fuel gas is further reduced, and then the fuel gas flows into the first fuel gas flow grooves 56a to 56d. Supplied. Accordingly, there is no speed difference between the positions of the first fuel gas flow grooves 56a to 56d, that is, the inflow speed of the fuel gas between the end position in the arrangement direction and the center position in the arrangement direction. The fuel gas can be uniformly distributed and supplied to the gas flow grooves 56a to 56d. Therefore, the fuel gas can be uniformly and smoothly supplied over the entire surface of the anode 34, and the power generation performance of the unit power generation cell 14 can be effectively improved.

Further, when the fuel gas is divided from the fuel gas supply manifold 24a and supplied to the first fuel gas flow grooves 56a to 56d of the first separator 46, the fuel gas changes to the flow (main flow) of the fuel gas supply manifold 24a. Has no effect. This is because the flow velocity of the divided fuel gas is reduced by being introduced into the communication portion 66a of the first seal member 42. For this reason, the plurality of unit power generation cells 1
4, a desired amount of fuel gas can be uniformly distributed and supplied from the fuel gas flowing through the fuel gas supply manifold 24a. A desired output can be reliably obtained as the entire stack 10.

Further, the surface 46 of the first separator 46
a having a first seal member 42 disposed at
The first seal member 42 includes the first separator 46.
Fuel gas supply hole 50a and first fuel gas flow groove 56
A communication portion 66a for communicating with a to 56d is provided. Further, the first seal member 42 is provided with a communication part 66b for communicating the fuel gas discharge hole 50b of the first separator 46 with the second fuel gas circulation grooves 58a, 58b.

Thus, it is not necessary to form a stepped chamber or the like in the first separator 46, and the thickness of the first separator 46 is considerably increased in order to secure the strength and rigidity of the stepped portion. No need to set. Therefore, it is possible to use the first separator 46 which is considerably thinner, the size of the unit power generation cell 14 in the direction of arrow A is effectively shortened, and the size of the entire fuel cell stack 10 is easily reduced. There is.

When the oxidizing gas is supplied to the first oxidizing gas flow grooves 60a to 60d provided in the second separator 48, the oxidizing gas can be supplied uniformly and smoothly. As a result, the power generation performance of the unit power generation cell 14 can be effectively improved.

Further, similarly, the cooling medium can be uniformly supplied to the temperature adjusting cell 18 as well, and the cooling efficiency of the unit power generation cell 14 is effectively improved, and the power generation performance of the entire fuel cell stack 10 is maintained at a high level. It becomes possible to do.

FIG. 5 shows a first (or second) seal member 8 constituting a unit power generation cell according to a second embodiment of the present invention.
FIG. 5 is a perspective explanatory view of a zero and a first separator. Note that the same components as those of the unit power generation cell 14 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the first seal member 80, the fuel gas supply hole 50 a and the first fuel gas flow grooves 56 a to 56 d of the first separator 46 are provided in the seal portion 82 a for sealing around the fuel gas supply hole 50 a. The first fuel gas flow grooves 56 are formed by groove-shaped communication portions 84a to 84d that communicate with the first fuel gas flow grooves 56.
a to 56d. In the first seal member 80, a groove-shaped communicating portion that communicates the fuel gas discharge hole 50b and the second fuel gas flow grooves 58a, 58b is formed on a seal portion 82b that seals around the fuel gas discharge hole 50b. 86a and 86b are provided in the second fuel gas flow grooves 58.
a, 58b.

In the second embodiment configured as described above, the fuel gas supplied to the fuel gas supply hole 50 a of the first separator 46 is connected to the communicating portions 84 a to 84 a provided in the first seal member 80. After passing through 84d, the fuel gas is supplied to the first fuel gas flow grooves 56a to 56d. For this reason, the fuel gas supply holes 50a extend from the first fuel gas flow grooves 56a to 56a.
While the fuel gas is supplied to 6d, the flow direction of the fuel gas is changed, and the flow velocity is reduced.

As a result, in the second embodiment, the fuel gas can be uniformly distributed and supplied to the first fuel gas flow grooves 56a to 56d, and the power generation performance of the unit power generation cell 14 can be effectively improved. For example, the same effects as those of the first embodiment can be obtained. Although the case of distributing and supplying the fuel gas has been described in the second embodiment, the same configuration is adopted for the oxidizing gas and the cooling medium.

[0056]

In the fuel cell according to the present invention, the fluid is supplied from the fluid hole of the separator to the flow passage provided in the plane of the separator via the flow path member. The direction is variously changed, the flow velocity is reduced, and the fluid can be uniformly distributed and supplied to the flow passage. Thereby, the power generation efficiency of the unit power generation cell is effectively improved, and the thickness of the separator can be set to be thin, so that the fuel cell can be easily made thin.

Further, in the fuel cell stack according to the present invention, the fluid is supplied from the fluid hole constituting the internal manifold to the flow passage provided in the plane of each separator via the flow passage member. The flow velocity of the fluid is effectively reduced, so that the fluid can be uniformly distributed and supplied to the flow passage.

Therefore, the power generation performance of the unit power generation cells can be improved, and the fluid can be uniformly distributed to each unit power generation cell without changing the flow of the fluid in the internal manifold. . This makes it possible to reliably maintain the power generation performance of each unit power generation cell and effectively improve the output of the entire fuel cell stack. In addition, the size of the entire fuel cell stack can be easily reduced without increasing the thickness of the separator.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of a main part of the fuel cell stack.

FIG. 3 is an explanatory sectional view of a unit power generation cell constituting the fuel cell stack.

FIG. 4 is a front view of a second separator constituting the unit power generation cell.

FIG. 5 is a perspective explanatory view of a first (or second) seal member and a first separator constituting a unit power generation cell according to a second embodiment of the present invention.

FIG. 6 is a front view of a separator according to the related art.

FIG. 7 is an explanatory sectional view of a unit power generation cell incorporating the separator according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 14 ... Unit power generation cell 16a, 16b ... Current collection electrode 18 ... Temperature adjustment cell 20a, 20b ... End plate 24a ... Fuel gas supply manifold 24b ... Fuel gas discharge manifold 26a ... Oxidant gas supply manifold 26b ... Oxidant gas discharge manifold 28a ... Cooling medium supply manifold 28b ... Cooling medium discharge manifold 30 ... Electrolyte 32 ... Cathode side electrode 34 ... Anode side electrode 36 ... Joint bodies 42,44,8
0: seal members 46, 48 ... separator 50a ... fuel gas supply hole 50b ... fuel gas discharge hole 52a ... oxidant gas supply hole 52b ... oxidant gas discharge hole 54a ... cooling medium supply hole Portion 54b Coolant discharge holes 56a-56d, 58a, 58b Fuel gas flow grooves 60a-60d, 62a, 62b Oxidant gas flow grooves 64a, 64b, 68a, 68b, 82a, 82b Seal portions 66a, 66b, 70a, 70b, 84a to 84d, 8
6a, 86b ... communication part

Claims (4)

[Claims] 1. A fuel cell comprising a unit formed by sandwiching an electrolyte between an anode-side electrode and a cathode-side electrode, and comprising a unitary power generation cell sandwiching the joint between separators, wherein the separator comprises: A fluid hole through which a fluid containing at least one of a fuel gas, an oxidizing gas or a cooling medium flows through in the thickness direction, and the fluid is supplied along the plane of the separator, A flow path terminating in the vicinity of the fluid hole, and a flow path member for allowing the fluid to flow between the fluid hole and the flow path on the surface of the separator. A fuel cell, wherein: 2. The fuel cell according to claim 1, wherein the flow path member is a seal member interposed between the separator and the joined body, and the seal member has a hole for the fluid. A fuel cell, characterized in that a communication portion that connects the fluid hole and the flow passage is provided in a seal portion that seals around. 3. A fuel cell stack comprising a joined body comprising an electrolyte sandwiched between an anode side electrode and a cathode side electrode, and a plurality of unit power generation cells sandwiching the joined body between separators. In the separator, a fluid including at least one of a fuel gas, an oxidizing gas, and a cooling medium flows through the separator in a thickness direction, and forms an internal manifold extending in a stacking direction. A fluid hole, and a fluid passage that supplies the fluid along the surface of the separator and terminates near the fluid hole. The fluid hole includes a fluid hole. A fuel cell stack provided with a flow path member for allowing the fluid to flow between the fuel cell stack and the flow passage. 4. The fuel cell stack according to claim 3, wherein the flow path member is a seal member interposed between the separator and the assembly, and the seal member is the fluid hole. A fuel cell stack, characterized in that a communication portion that connects the fluid hole and the flow passage is provided in a seal portion that seals around the fuel cell.