JP5249177B2 - Fuel cell system - Google Patents

Description

  The present invention provides a unit cell for sandwiching an electrolyte / electrode structure provided with a pair of electrodes on both sides of an electrolyte with a separator, and stacks a plurality of the unit cells in a horizontal direction, and in the stacking direction of each unit cell. The present invention relates to a fuel cell system including a fuel cell stack formed by penetrating through and forming six communication holes on the left and right.

  For example, a polymer electrolyte fuel cell employs an electrolyte membrane (electrolyte) made of a polymer ion exchange membrane. On both sides of the electrolyte membrane, there are provided an electrolyte membrane / electrode structure in which an anode-side electrode and a cathode-side electrode each having a noble metal-based electrode catalyst layer bonded to a base mainly composed of carbon are provided. A fuel cell is configured by sandwiching the structure with a separator.

  In this type of fuel cell, 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 ionized by hydrogen on the electrode catalyst, via an electrolyte. It moves to the cathode side electrode side. Electrons generated during that time are taken out to an external circuit and used as direct current electric energy. The cathode side electrode is supplied with an oxidant gas, for example, a gas mainly containing oxygen or air (hereinafter also referred to as an oxygen-containing gas). And oxygen reacts to produce water.

  Normally, this fuel cell is used as a fuel cell stack in which a predetermined number (for example, several tens to several hundreds) is stacked in order to obtain a desired power generation. At that time, there is a problem that the length of the fuel cells in the stacking direction becomes considerably long, and the fuel gas cannot be uniformly supplied to each fuel cell. Therefore, a fuel cell system is used in which a plurality of fuel cell stacks are prepared and the fuel cell stacks are arranged in parallel with each other.

  For example, “integrated external manifold assembly for electrochemical fuel cell stack array” disclosed in Patent Document 1 is known. In this patent document 1, as shown in FIG. 9, the electrochemical fuel cell stack array 1 includes four fuel cell stacks 2a to 2d, and each fuel cell stack 2a to 2d includes a plurality of unit cells 3. They are stacked in the direction of the arrow X.

  An external manifold assembly 4 is connected to the electrochemical fuel cell stack array 1. The external manifold assembly 4 includes supply-side manifold main pipes 5a, 5b, and 5c and discharge-side manifold main pipes 6a, 6b, and 6c.

  The manifold main pipes 5a to 5c flow fuel gas, an oxidant gas, and a cooling medium. For example, a plurality of manifold branch pipes 7 are connected to the manifold main pipe 5a, and each fuel cell stack 2a to 2c. A reactive gas stream is supplied to 2d.

  On the other hand, the manifold main pipes 6a to 6c are similarly configured to flow a fuel gas, an oxidant gas, and a cooling medium. For example, a plurality of manifold branch pipes 8 are connected to the manifold main pipe 6a. A reaction gas flow is discharged from each of the fuel cell stacks 2a to 2d via the branch pipe 8.

International Publication No. 96/20509 Pamphlet (Figure 1)

  However, in Patent Document 1 described above, since the external manifold assembly 4 is provided at both ends of the electrochemical fuel cell stack array 1 in the direction of the arrow X, the entire electrochemical fuel cell stack array 1 is considerably large. In addition, the piping system becomes complicated and large. Accordingly, it has been pointed out that the piping connection work becomes complicated and the space efficiency is lowered, and in particular, it cannot be effectively applied to a vehicle.

  Further, each manifold branch pipe 7 branched from the manifold main pipe 5a and each manifold branch pipe 8 branched from the manifold main pipe 6a correspond to supply ports and discharge ports of the fuel cell stacks 2a to 2d, respectively. The length is different. Thereby, there exists a problem that a reactive gas cannot be uniformly supplied to each fuel cell stack 2a-2c.

  The present invention solves this type of problem, and can effectively simplify and downsize the piping structure of the fuel cell stack, reduce the number of parts, and simplify the assembly work. The purpose is to provide.

In the fuel cell system according to the present invention , an electrolyte / electrode structure provided with a pair of electrodes on both sides of the electrolyte is provided with a unit cell sandwiched by separators, and a plurality of the unit cells are stacked in a horizontal direction, and each unit Six communication holes including a fuel gas inlet communication hole, an oxidant gas inlet communication hole, a cooling medium inlet communication hole, a fuel gas outlet communication hole, an oxidant gas outlet communication hole, and a cooling medium outlet communication hole penetrating in the cell stacking direction However, it is provided with a fuel cell stack formed by distributing three each on the left and right.

  The fuel cell stack includes a single first manifold connected to three communication holes formed at one end, and a single first manifold connected to three communication holes formed at the other end. Two manifolds are provided, and the first and second manifolds are connected by a plurality of pipes.

  The plurality of pipes are preferably arranged in contact with the end plate. Furthermore, it is preferable that the plurality of pipes are arranged so that adjacent pipes are in contact with each other.

According to the present invention , since the single manifold connected to each of the three communication holes is provided, the number of parts is reduced at a time, and it is economical, and the entire assembling work is easily simplified.

  Furthermore, since the plurality of pipes are arranged in contact with the end plate, it is possible to keep the end plate warm via the exhaust reaction gas and the exhaust cooling medium that become high temperature. Therefore, the warm-up process in the fuel cell stack is quickly performed with a simple configuration.

  In addition, since the plurality of pipes are arranged so that adjacent pipes are in contact with each other, the supply reaction gas and the supply cooling medium can be heated via the discharge reaction gas and the discharge cooling medium. Thereby, the temperature in the fuel cell stack can be easily made uniform.

1 is a schematic overall perspective view of a fuel cell system according to an embodiment of the present invention. It is a partial cross section side view of the fuel cell stack which comprises the said fuel cell system. It is a disassembled perspective explanatory drawing of the unit cell which comprises the said fuel cell stack. It is a perspective view of the fuel cell stack. It is flow explanatory drawing of the reaction gas and cooling medium of the said fuel cell system. FIG. 3 is a flow explanatory diagram in an assembly manifold constituting the fuel cell system. It is a cross-sectional explanatory drawing of the connection block which comprises the said assembly manifold. It is front explanatory drawing of the said collection manifold. It is explanatory drawing of the assembly which concerns on patent document 1. FIG.

  FIG. 1 is a schematic overall perspective view of a fuel cell system 10 according to an embodiment of the present invention.

  The fuel cell system 10 includes a first fuel cell stack 12 and a second fuel cell stack 14 that have the same configuration and are arranged in parallel with each other along the horizontal direction (arrow A direction) with the polarity reversed. An assembly manifold 16 is integrally attached to one end in the horizontal direction of the first and second fuel cell stacks 12 and 14.

  As shown in FIG. 2, the first fuel cell stack 12 includes a stacked body 20 in which a plurality of unit cells 18 are stacked in the horizontal direction (arrow A direction). A terminal plate 22a, an insulating plate 24, and a first end plate 26a are sequentially arranged at one end in the stacking direction (arrow A direction) of the stacked body 20 toward the outside. At the other end in the stacking direction of the stacked body 20, a terminal plate 22b, an insulating spacer member 28, and a second end plate 26b are sequentially disposed outward. The first fuel cell stack 12 is integrally held by a casing 29 including first and second end plates 26a and 26b each having a quadrangular (rectangular) shape as end plates.

  As shown in FIGS. 2 and 3, each unit cell 18 includes an electrolyte membrane / electrode structure (electrolyte / electrode structure) 30, and a thin plate-shaped first and second sandwiching the electrolyte membrane / electrode structure 30. Second metal separators 32 and 34 are provided.

  An oxidant gas supply for supplying an oxidant gas, for example, an oxygen-containing gas, to one end edge of the unit cell 18 in the long side direction (the arrow B direction in FIG. 3) communicates with each other in the arrow A direction. A communication hole 36a, a cooling medium supply communication hole 38a for supplying a cooling medium, and a fuel gas discharge communication hole 40b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided.

  The other end edge of the unit cell 18 in the long side direction communicates with each other in the direction of arrow A, and a fuel gas supply communication hole 40a for supplying fuel gas, and a cooling medium discharge communication hole for discharging the cooling medium. 38b and an oxidizing gas discharge communication hole 36b for discharging the oxidizing gas are provided.

  The electrolyte membrane / electrode structure 30 includes, for example, a solid polymer electrolyte membrane 42 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode side electrode 44 and a cathode side electrode 46 that sandwich the solid polymer electrolyte membrane 42. With.

  The anode side electrode 44 and the cathode side electrode 46 are composed of a gas diffusion layer made of carbon paper or the like, and an electrode catalyst layer in which porous carbon particles carrying a platinum alloy on the surface are uniformly applied to the surface of the gas diffusion layer. And have. The electrode catalyst layers are bonded to both surfaces of the solid polymer electrolyte membrane 42 so as to face each other with the solid polymer electrolyte membrane 42 interposed therebetween.

  A fuel gas flow path 48 that connects the fuel gas supply communication hole 40 a and the fuel gas discharge communication hole 40 b is formed on the surface 32 a of the first metal separator 32 facing the electrolyte membrane / electrode structure 30. The fuel gas channel 48 is constituted by, for example, a plurality of grooves extending in the arrow B direction. On the surface 32b of the first metal separator 32, a cooling medium flow path 50 that connects the cooling medium supply communication hole 38a and the cooling medium discharge communication hole 38b is formed. The cooling medium flow path 50 is configured by a plurality of grooves extending in the arrow B direction.

  The surface 34a of the second metal separator 34 facing the electrolyte membrane / electrode structure 30 is provided with, for example, an oxidant gas flow path 52 composed of a plurality of grooves extending in the direction of arrow B, and this oxidant gas. The flow path 52 communicates with the oxidant gas supply communication hole 36a and the oxidant gas discharge communication hole 36b. A cooling medium flow path 50 is integrally formed on the surface 34 b of the second metal separator 34 so as to overlap the surface 32 b of the first metal separator 32.

  A first seal member 54 is integrally formed on the surfaces 32 a and 32 b of the first metal separator 32 around the outer peripheral end of the first metal separator 32. The first seal member 54 surrounds the fuel gas supply communication hole 40a, the fuel gas discharge communication hole 40b, and the fuel gas flow path 48 on the surface 32a so as to communicate with each other, and on the surface 32b, the cooling medium supply communication hole 38a, The medium discharge communication hole 38b and the cooling medium flow path 50 are surrounded and communicated with each other.

  A second seal member 56 is integrally formed on the surfaces 34 a and 34 b of the second metal separator 34 around the outer peripheral end of the second metal separator 34. The second seal member 56 surrounds and communicates the oxidant gas supply communication hole 36a, the oxidant gas discharge communication hole 36b, and the oxidant gas flow path 52 on the surface 34a, while the cooling medium supply communication hole on the surface 34b. 38a, the cooling medium discharge communication hole 38b, and the cooling medium flow path 50 are surrounded and communicated.

  As shown in FIG. 2, a seal 57 is interposed between the first and second seal members 54 and 56 to prevent the outer periphery of the solid polymer electrolyte membrane 42 from directly contacting the casing 29. The outer peripheral end portions of the first and second seal members 54 and 56 may have a slight gap with the inner surface of the casing 29 or may be in contact with the inner surface. This is to restrict the first and second metal separators 32 and 34 from bending beyond a predetermined amount.

  As shown in FIGS. 1 and 2, plate-like terminal portions 58a and 58b projecting in the surface direction are formed at the end portions of the terminal plates 22a and 22b.

  As shown in FIGS. 1, 2, and 4, the casing 29 includes first and second end plates 26 a and 26 b that are end plates, and a plurality of side plates 60 a to 60 d that are disposed on the side portions of the stacked body 20. , Angle members (for example, L angles) 62a to 62d that connect the adjacent end portions of the side plates 60a to 60d with screws, the first and second end plates 26a and 26b, and the side plates 60a to 60d. Are provided with connecting pins 64a and 64b having different lengths.

  As shown in FIG. 4, at one end in the arrow B direction of the first end plate 26a, an oxidant gas inlet 66a communicating with the oxidant gas supply communication hole 36a, a cooling medium inlet 68a communicating with the cooling medium supply communication hole 38a, In addition, a fuel gas outlet 70b communicating with the fuel gas discharge communication hole 40b is formed.

  At the other end of the first end plate 26a in the direction of arrow B, a fuel gas inlet 70a that communicates with the fuel gas supply communication hole 40a, a cooling medium outlet 68b that communicates with the cooling medium discharge communication hole 38b, and an oxidant gas discharge communication hole 36b. An oxidant gas outlet 66b communicating with the oxidant gas is formed.

  As shown in FIG. 2, the spacer member 28 has a rectangular shape set to a predetermined size so as to be positioned on the inner periphery of the casing 29. The spacer member 28 is adjusted in thickness in order to absorb a length variation in the stacking direction of the stacked body 20 and to apply a desired tightening load to the stacked body 20. The spacer member 28 may not be used as long as the variation in the length of the stacked body 20 in the stacking direction can be absorbed by the elasticity of the first and second metal separators 32 and 34 themselves.

  The second fuel cell stack 14 is configured substantially the same as the first fuel cell stack 12 configured as described above, and the same components are denoted by the same reference numerals, and detailed description thereof will be given. Omitted.

  The stacked body 20 constituting the first and second fuel cell stacks 12 and 14 has exactly the same configuration. For example, the second fuel cell stack 14 is configured in order to reverse the respective polarities. The stacked body 20 is inverted 180 ° around the vertical axis with respect to the stacked body 20 constituting the first fuel cell stack 12.

  In the second fuel cell stack 14, as shown in FIG. 5, an oxidant gas inlet 72a, a cooling medium inlet 74a, and a fuel gas outlet 76b are formed in the second end plate 26b on one end side in the arrow B direction, and the fuel gas An inlet 76a, a cooling medium outlet 74b, and an oxidant gas outlet 72b are formed on the other end side in the arrow B direction.

  The oxidant gas inlets 66a and 72a, the coolant inlets 68a and 74a, and the fuel gas outlets 70b and 76b are symmetrical to each other at positions close to each other with respect to the intermediate position P of the first and second fuel cell stacks 12 and 14. On the other hand, the fuel gas inlets 70a and 76a, the cooling medium outlets 68b and 74b, and the oxidant gas outlets 66b and 72b are provided at positions that are separated from each other and symmetrical.

  As shown in FIG. 1, the collective manifold 16 is integrally attached to the first and second end plates 26 a and 26 b on the one end side adjacent to each other of the first and second fuel cell stacks 12 and 14. As shown in FIGS. 1 and 6, the collective manifold 16 is provided with a connection block 80 at the central portion of the collective manifold 16, and six pipes 82 a to 82 f and 84a-84f are connected.

  The pipes 82 a to 82 f extend to the first fuel cell stack 12 side and are connected to the first manifold 86. The first manifold 86 is connected to an oxidant gas inlet 66a, a coolant inlet 68a, and a fuel gas outlet 70b, which are three communication holes formed at one end of the first fuel cell stack 12. Configure the manifold.

  A single second manifold 88 is connected to the fuel gas inlet 70a, the coolant outlet 68b, and the oxidant gas outlet 66b, which are three communication holes formed at the other end of the first fuel cell stack 12. . One end of four pipes 90a to 90d communicating with the pipes 82a to 82e, respectively, is connected to the first manifold 86.

  The other ends of the pipes 90 a, 90 b and 90 d are connected to the second manifold 88, while the other end of the pipe 90 c extends to the side of the first fuel cell stack 12 through the outer periphery of the second manifold 88. doing. The pipes 90 a to 90 d are arranged in contact with each other's outer peripheral surfaces and are in contact with the surface of the first end plate 26 a of the first fuel cell stack 12.

  The pipes 84 a to 84 f extend to the second fuel cell stack 14 side and are connected to the third manifold 92. The third manifold 92 is a single connected to the oxidant gas inlet 72a, the coolant inlet 74a, and the fuel gas outlet 76b, which are three communication holes formed at one end of the second fuel cell stack 14. Configure the manifold.

  A single fourth manifold 94 is connected to the fuel gas inlet 76a, the coolant outlet 74b, and the oxidant gas outlet 72b, which are three communication holes formed at the other end of the second fuel cell stack 14. .

  One end of four pipes 96 a to 96 d communicating with the pipes 84 a to 84 e is connected to the third manifold 92, and the other end of the pipes 96 a, 96 c and 96 d is connected to the fourth manifold 94. The other end of the pipe 96 b extends to the side of the second fuel cell stack 14 in a state where a part is connected to the second manifold 88.

  A fuel gas supply port 98 a and a fuel gas discharge port 98 b are provided on the surface 80 a which is one surface of the connection block 80. The fuel gas supply port 98a communicates with the pipes 82b and 84b, while the fuel gas discharge port 98b communicates with the pipes 82f and 84f.

  As shown in FIG. 7, on the upper side of the back surface 80b, which is the other surface of the connecting block 80, an oxidant gas supply port 100a communicating with the pipes 82a and 84a and an oxidant gas exhaust communicating with the pipes 82e and 84e. The outlet 100b is formed close to the outlet 100b. A humidifier 102 communicating with the oxidant gas supply port 100a and the oxidant gas discharge port 100b is attached to the back surface 80b.

  As shown in FIGS. 6 and 8, the first manifold 86 communicates the oxidant gas inlet 66a with the piping 82a, the cooling medium inlet 68a with the piping 82d and 90c, and the fuel gas outlet 70b with the piping 82f. To do. The second manifold 88 communicates the fuel gas inlet 70a with the pipe 90a, communicates the coolant outlet 68b with the pipe 90d, and communicates the oxidant gas outlet 66b with the pipe 90b.

  Similarly, the third manifold 92 communicates the oxidant gas inlet 72a with the pipe 84a, communicates the cooling medium inlet 74a with the pipe 84d (and the pipe 96c with the end closed if necessary), and the fuel gas outlet. 76b communicates with the pipe 84f. The fourth manifold 94 communicates the fuel gas inlet 76a with the pipe 96a, communicates the coolant outlet 74b with the pipe 96b, and communicates the oxidant gas outlet 72b with the pipe 96d.

  In the collective manifold 16, the pipes 82a and 84a constitute an oxidant gas supply pipe, the pipes 82b, 84b, 90a and 96a constitute a fuel gas supply pipe, and the pipes 82c, 84c, 90b and 96b serve as a cooling medium discharge pipe. The pipes 82d, 84d and 90c constitute a cooling medium supply pipe, the pipes 82e, 84e, 90d and 96d constitute an oxidant gas discharge pipe, and the pipes 82f and 84f constitute a fuel gas discharge pipe.

  The pipes 82a to 82f, 84a to 84f, 90a to 90d, and 96a to 96d are formed of, for example, a metal material, a heat conductive resin material, an insulating resin material, or the like excellent in thermal conductivity. An insulating coat may be applied to the inner surface of the flow path of the metal material.

  As shown in FIG. 1, the terminal portion 58 a close to the collective manifold 16 of the first fuel cell stack 12 and the terminal portion 58 b close to the collective manifold 16 of the second fuel cell stack 14 are connected via a cable 104. Electrically connected. The terminal portion 58a is, for example, a negative electrode, while the terminal portion 58b is, for example, a positive electrode. When the terminal portion 58b is electrically connected by the cable 104, the first and second fuel cell stacks 12, 14 are electrically connected. Connected in series. The terminal portion 58b of the first fuel cell stack 12 and the terminal portion 58a of the second fuel cell stack 14 are connected to an external load 106 such as a motor, for example.

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

  First, as shown in FIGS. 1, 6, and 7, in the fuel cell system 10, an oxidizing agent such as an oxygen-containing gas is supplied from the humidifier 102 attached to the collective manifold 16 to the oxidizing gas supply port 100 a of the connection block 80. A gas is supplied and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas supply port 98a of the connection block 80. Furthermore, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the pipe 90c.

  The oxidant gas supplied to the oxidant gas supply port 100a of the connection block 80 is sent to the first and third manifolds 86 and 92 through the pipes 82a and 84a. Therefore, the oxidant gas is supplied to the oxidant gas inlets 66a and 72a of the first and second end plates 26a and 26b constituting the first and second fuel cell stacks 12 and 14 (FIGS. 5 and 6). reference).

  The fuel gas supplied to the fuel gas supply port 98a of the connecting block 80 is supplied from the pipes 82b and 84b to the fuel gas inlets 70a and 76a of the first and second fuel cell stacks 12 and 14 through the pipes 90a and 96a. The

  A part of the cooling medium supplied to the pipe 90c is sent from the second manifold 88 to the cooling medium inlet 68a of the first fuel cell stack 12, and the remaining part is supplied from the third manifold 92 via the pipes 82d and 84d. 2 is supplied to the coolant inlet 74 a of the fuel cell stack 14.

  Next, in the first fuel cell stack 12, as shown in FIG. 3, the oxidant gas is introduced into the oxidant gas flow path 52 of the second metal separator 34 from the oxidant gas supply communication hole 36a, and the electrolyte membrane / It moves along the cathode side electrode 46 of the electrode structure 30. On the other hand, the fuel gas is introduced into the fuel gas passage 48 of the first metal separator 32 through the fuel gas supply communication hole 40 a and moves along the anode side electrode 44 of the electrolyte membrane / electrode structure 30.

  Therefore, in each electrolyte membrane / electrode structure 30, the oxidant gas supplied to the cathode side electrode 46 and the fuel gas supplied to the anode side electrode 44 are consumed by an electrochemical reaction in the electrode catalyst layer, Power generation is performed.

  Next, the oxidant gas consumed by being supplied to the cathode side electrode 46 flows along the oxidant gas discharge communication hole 36b, and is then discharged to the oxidant gas outlet 66b of the first end plate 26a (FIG. 5). reference). Similarly, the fuel gas consumed by being supplied to the anode side electrode 44 is discharged to the fuel gas discharge communication hole 40b, flows, and discharged to the fuel gas outlet 70b of the first end plate 26a.

  The cooling medium flows in the direction of arrow B after being introduced into the cooling medium flow path 50 between the first and second metal separators 32 and 34 from the cooling medium supply communication hole 38a. The cooling medium cools the electrolyte membrane / electrode structure 30, moves through the cooling medium discharge communication hole 38 b, and is discharged to the cooling medium outlet 68 b of the first end plate 26 a.

  In the second fuel cell stack 14, as in the first fuel cell stack 12, the used oxidant gas is discharged to the oxidant gas outlet 72b of the second end plate 26b (see FIG. 5). Further, the used fuel gas is discharged to the fuel gas outlet 76b of the second end plate 26b, and the used cooling medium is discharged to the cooling medium outlet 74b of the second end plate 26b.

  As shown in FIGS. 6 and 8, the oxidant gas discharged to the oxidant gas outlets 66b and 72b is sent from the second and fourth manifolds 88 and 94 to the pipes 82e and 84e through the pipes 90d and 96d. . Further, the oxidant gas rises in the connecting block 80 and is sent from the oxidant gas discharge port 100b to the humidifier 102 (see FIG. 7).

  In the humidifier 102, moisture and heat are exchanged from the used oxidant gas to the oxidant gas before use. For this reason, the oxidant gas before use is supplied to the first and second fuel cell stacks 12 and 14 after being adjusted to a desired temperature in a desired humidified state.

  On the other hand, the fuel gas discharged to the fuel gas outlets 70b and 76b is discharged from the first and third manifolds 86 and 92 through the pipes 82f and 84f as shown in FIGS. It is discharged to the outlet 98b.

  Further, the cooling medium discharged to the cooling medium outlet 68b reaches the first manifold 86 from the second manifold 88 through the pipe 90b, and is discharged to the outside through the pipes 82c, 84c and 96b. Further, the cooling medium discharged from the cooling medium outlet 74b joins the pipe 96b and is discharged to the outside.

  In this case, in this embodiment, the first and second fuel cell stacks 12 and 14 are arranged in parallel, and the first and second end plates 26a and 26b of the first and second fuel cell stacks 12 and 14 are adjacent to each other. The assembly manifold 16 is integrally mounted. A connecting block 80 is provided in the central portion of the collective manifold 16, and the connecting block 80 includes a fuel gas supply port 98a, a fuel gas discharge port 98b, an oxidant gas supply port 100a, and an oxidant gas discharge port 100b. It has.

  Accordingly, the fuel gas and the oxidant gas can be evenly distributed from the connection block 80 to the first and second fuel cell stacks 12 and 14, and the first and second fuel cell stacks 12 and 14 The effect that the desired power generation function can be reliably maintained is obtained.

  In addition, the assembly manifold 16 is mounted on one end side of the first and second fuel cell stacks 12 and 14 adjacent to each other. For this reason, the fuel cell system 10 as a whole can be easily downsized, and the piping structure and piping installation work can be simplified.

  A fuel gas supply port 98a and a fuel gas discharge port 98b are provided on the surface 80a of the connection block 80, while an oxidant gas supply port 100a and an oxidant gas discharge port 100b are provided on the back surface 80b of the connection block 80. Is provided (see FIG. 7). Therefore, a sufficient space for the pipe joint can be secured on the front and back surfaces (the front surface 80a and the back surface 80b) of the connection block 80, and the space efficiency can be improved. Moreover, the humidifier 102 is disposed between the first and second fuel cell stacks 12 and 14, and there is an advantage that the piping distance between the humidifier 102 and the connection block 80 is effectively shortened.

  Furthermore, in the present embodiment, in the first fuel cell stack 12, as shown in FIG. 6, a single first manifold 86 connected to the oxidant gas inlet 66a, the coolant inlet 68a, and the fuel gas outlet 70b, A single second manifold 88 connected to the fuel gas inlet 70a, the coolant outlet 68b and the oxidant gas outlet 66b is provided. Similarly, the second fuel cell stack 14 is provided with single third and fourth manifolds 92 and 94 connected to three communication holes, respectively. As a result, the number of parts can be reduced all at once, which is economical, and the assembly work of the entire assembly manifold 16 is advantageously simplified.

  Furthermore, in the first fuel cell stack 12, a plurality of pipes 90a to 90d are disposed in contact with the surface of the first end plate 26a. For this reason, the exhaust cooling medium and the exhaust oxidant gas that are heated by the power generation of the first fuel cell stack 12 flow through the pipes 90b and 90d, respectively, so that heat is transferred from the pipes 90b and 90d to the first end plate 26a. Done.

  Therefore, in particular, it becomes possible to quickly warm up the end cells of the first fuel cell stack 12 (unit cells 18 arranged at the ends in the stacking direction) at the time of low-temperature startup, and with the simple configuration, the first cell There is an advantage that an efficient warm-up process of one fuel cell stack 12 is easily performed.

  The pipes 90a to 90d are arranged such that adjacent pipes are in contact with each other. Thereby, the supply fuel gas and the supply cooling medium flowing through the pipes 90a and 90c can be heated via the high-temperature exhaust cooling medium and the exhaust oxidant gas flowing through the pipes 90b and 90d.

  For this reason, it becomes possible to easily equalize the temperature in the first fuel cell stack 12 and maintain an efficient power generation function. On the other hand, in the second fuel cell stack 14, the same effect as the first fuel cell stack 12 can be obtained.

  In the present embodiment, for example, the angle members 62a to 62d are used as the connecting member, but the present invention is not limited to this. For example, the connecting members may be configured by forming flange portions that are bent on the side plates 60a to 60d themselves, and screwing the flange portions to connect the side plates 60a to 60d. Moreover, you may comprise a connection member by welding and integrating the side plates 60a-60d.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell system 12, 14 ... Fuel cell stack 16 ... Collective manifold 18 ... Unit cell 20 ... Laminate body 26a, 26b ... End plate 29 ... Casing 30 ... Electrolyte membrane and electrode structure 32, 34 ... Separator 36a ... Oxidant Gas supply communication hole 36b ... Oxidant gas discharge communication hole 38a ... Cooling medium supply communication hole 38b ... Cooling medium discharge communication hole 40a ... Fuel gas supply communication hole 40b ... Fuel gas discharge communication hole 42 ... Solid polymer electrolyte membrane 44 ... Anode Side electrode 46 ... Cathode side electrode 48 ... Fuel gas flow path 50 ... Cooling medium flow path 52 ... Oxidant gas flow path 58a, 58b ... Terminal portions 60a-60d ... Side plates 66a, 72a ... Oxidant gas inlets 66b, 72b ... Oxidation Agent gas outlet 68a, 74a ... Cooling medium inlet 68b, 74b ... Cooling medium outlet 70a, 76a ... Fuel gas inlet 70b, 76b ... Fuel gas outlet 80 ... Connection blocks 82a-82f, 84a-84f, 90a-90d, 96a-96d ... Piping 86, 88, 92, 94 ... Manifold 98a ... Fuel gas supply port 98b ... Fuel gas discharge port 100a ... Oxidant gas supply port 100b ... Oxidant gas outlet 102 ... Humidifier

Claims (3)

A unit cell that sandwiches an electrolyte / electrode structure having a pair of electrodes on both sides of an electrolyte by a separator is provided, and a plurality of the unit cells are stacked in a horizontal direction, and fuel is penetrated in the stacking direction of each unit cell. Six communication holes, gas inlet communication holes, oxidant gas inlet communication holes, cooling medium inlet communication holes, fuel gas outlet communication holes, oxidant gas outlet communication holes, and cooling medium outlet communication holes, are divided into three on the left and right sides. Comprising a formed fuel cell stack,
The fuel cell stack includes a single first manifold connected to three communication holes formed at one end,
A single second manifold connected to the three communication holes formed at the other end;
Three pipes connected to the second manifold in communication with the communication holes formed in the other end;
Is provided,
Fuel cell system, characterized in that the three pipes are to be pre-SL through the first manifold connecting the said first manifold second manifold. In claim 1 Symbol placement of the fuel cell system, the three pipes, the fuel cell system, characterized in that in contact with the end plate constituting the end of the fuel cell stack is arranged. According to claim 1 or 2 fuel cell system, wherein the three pipes, the fuel cell system characterized in that the adjacent pipes each other are arranged in contact.

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