JP5485633B2 - Fuel cell - Google Patents

Description

  The present invention relates to a fuel cell, particularly a solid oxide fuel cell, capable of stably outputting electric power even in a high temperature state.

  Conventionally, a solid oxide fuel cell is configured by stacking a plurality of fuel cells, and a large power output can be obtained by increasing the number of stacked fuel cells. ing.

  Here, the fuel cells are stacked by sandwiching the entire plurality of fuel cells with an end plate. Electric power is taken out by using the end plate as a positive electrode and a negative electrode of the fuel cell. As a technique for extracting electric power from the end plate, there is a technique using an output member composed of a conductive member having oxidation resistance and a core material excellent in electric conduction (see, for example, Patent Document 1).

JP 2008-52943 A

  However, since the solid oxide fuel cell has a high temperature during power generation, the output lead-out lead wire also has a very high temperature. When the conducting wire becomes high temperature, depending on the material, the conducting wire oxidizes and becomes highly resistive, resulting in a large output loss.

  Further, it is good to reduce the resistance by directly connecting a lead wire for taking out electric power to the end plate. However, in the screw-shaped output member described in Patent Document 1 considering the conductivity and heat resistance, If the screw diameter is increased for resistance, the thickness of the end plate is required to some extent, making it difficult to reduce the size and weight. In addition, the power output unit is preferably thin in consideration of the heat insulation of the stack module, but if it is thin, there is a problem that resistance increases and it is difficult to achieve both.

  The present invention has been made in view of such problems, and ensures solid contact between the fuel cell stack and the output member, improves the degree of freedom of the power output structure, and can be reduced in size and weight. An object is to provide a battery.

  A fuel cell (1) according to the invention made to solve such a problem is accommodated in a heat insulating container (80), and has a fuel electrode and an oxidant electrode arranged on both sides of a plate-like electrolyte layer, and is a fuel gas. The fuel cell (6) which generates electric power by reaction of oxidant gas is provided.

In addition, the fuel cell stack (7), which is arranged in the thickness direction of the electrolyte layer and sandwiches one fuel cell (6) or a plurality of the fuel cells (6), is sandwiched from both ends, and the generated power A plurality of fixing members (19) that penetrate through the fuel cell stack (7) and the end plates (8, 9) in the stacking direction and fix them, and end plates (8, 9) . And an output member (120, 122) for outputting the electric power extracted by 9) to the outside of the heat insulating container (80).

Further, the output member (120, 122) is disposed between the fixing member (19) and end plates (8,9), that have surface contact with the end plate (8,9).
In such a fuel cell (1), the electric power generated by the reaction between the fuel gas and the oxidant gas is output from the end plates (8, 9) in the fuel cell (6).

Is disposed between the fixing member (19) and end plates (8,9), from the end plate (8,9) in surface contact to have that output member (120, 122) to the outside of the heat insulating container (80) By configuring to output power, the size and shape of the output members (120, 122) themselves can be optimized in reducing the output loss of the output power.

  In particular, when the output member (120, 122) is in surface contact with the end plate (8, 9), the contact resistance between the end plate (8, 9) and the fixing member (19) or the output member (120, 122) itself. By making the shape to reduce the resistance of the fuel cell, the stability of the contact between the fuel battery cell (6) and the output member (120, 122) is secured, the degree of freedom of the structure for power output is improved, and the fuel The battery (1) can be reduced in size.

  Here, the output member (120, 122) may be in direct surface contact with the end plate (8, 9), or may be electrically energized via the conductive intermediate material (85). Good. That is, the conductive intermediate material (85) made of silver or an alloy containing silver may be sandwiched between the output member (120, 122) and the end plate (8, 9).

  Moreover, when the contact area of the part which the output member (120,122) and the end plate (8,9) are contacting is larger than the cross-sectional area with respect to the direction through which the electric current of an output member (120,122) flows. Since the electrical resistance to the output of the fuel cell (6) can be lowered, the output loss can be reduced. Moreover, attachment of an output member (120,122) becomes easy by having such a large contact area.

  Here, the fuel cell (6) (single cell) is one in which an oxidant electrode is formed on one surface of the electrolyte layer and a fuel electrode is formed on the other surface, and is the (minimum) power generation unit of the fuel cell. is there. Note that a gas introduction (discharge) mechanism that introduces (discharges) each reaction gas, a current collector that collects the generated electric power, and the like can be provided when actually generating power.

  Further, in the present invention, the fuel battery cell (6) is a device that is composed of one single cell or an assembly of a plurality of single cells (fuel cell stack (7)) and can output electric power to the outside. Thus, the end plates (8, 9) are arranged on both sides of the single cell or the fuel cell stack (7).

  The fuel cell stack (7) is an aggregate formed by stacking a plurality of single cells using conductive interconnectors. In general, the fuel cell stack (7) may further include auxiliary layers such as a combustion layer, a reforming layer, or a support layer in addition to the single cell. It is also conceivable to provide a “combustion layer, modified layer, etc.” in a single cell.

Here, the reforming layer is a layer having a catalytic function of reforming the source gas and generating hydrogen,
The combustion layer is a layer for detoxifying the fuel gas and the oxidant gas used for power generation in the fuel cell stack, and the support layer is a layer for maintaining the strength of each of the stacked layers. The support layer can be formed integrally with other layers.

The present invention is more effective when applied to a fuel cell that operates at a high temperature, such as a solid oxide fuel cell or a molten carbonate fuel cell.
Further, in this column, in order to facilitate understanding of the invention, the reference numerals used in the “Mode for Carrying Out the Invention” column are attached as necessary, which means that the scope of claims is limited by this reference numeral. Not what you want.

  When the output member (120, 122) is formed integrally with the end plate (8, 9), in the present invention, the output member (120, 122) is fixed to the end plate (8 by the fixing member (19). , 9) and are electrically connected to the output terminal members (130, 132) that are in surface contact with the end plates (8, 9) and the output terminal members (130, 132), and the output terminal members (130, 132). 132) and an output conductive member (134, 136) that outputs electric power to the outside of the heat insulating container (80).

If it does in this way, while the manufacturing process of a fuel cell (1) can be simplified, a fuel cell (1) can be reduced in size and weight, and cost can be reduced.
Further, the output terminal member (130, 132) has a shape suitable for taking out electric power by making surface contact with the end plate (8, 9) such as a flat plate, and the output conductive member (134, 136). Can be made into a shape suitable for outputting electric power, such as a round bar shape, and cost can be reduced by using a material that is easy to process such as a round bar shape material.

  Furthermore, the resistance value of the output conductive member (134, 136) can be reduced by, for example, increasing the diameter of the round bar of the output conductive member (134, 136). Furthermore, since the output terminal member (130, 132) and the output conductive member (134, 136) can be manufactured separately, the cost can be reduced.

  The output conductive members (134, 136) include a core portion formed of a material mainly composed of Cu, a clad portion mainly composed of a material having higher heat resistance than the core portion, and covering the core portion; You may form from.

  In this case, since the core portion using Cu having a low resistance value is covered with a material having high heat resistance, an output conductive member (134, 136) having low resistance and high heat resistance can be obtained. it can.

  Furthermore, when the clad portion of the output conductive member (134, 136) is formed of a material mainly composed of Ni, the surface of the output conductive member (134, 136) is a material mainly composed of Ni having high heat resistance. Therefore, the output conductive member (134, 136) having high heat resistance can be obtained.

  -By the way, when a fuel cell (6) is stored in a heat insulation container (80), the temperature is lower in the lower part than in the upper part in the heat insulation container (80) due to heat convection. Therefore, in the present invention, the output member (120, 122) may be configured to be electrically connected to the outside from below the heat insulating container (80).

  If it does in this way, since the temperature is lower in the lower part than the upper part inside the heat insulation container (80), when the electric power generated in the fuel cell (6) is output from the heat insulation container (80) to the outside, the output Heat flowing out from the members (120, 122) to the outside can be suppressed, and thermal efficiency is improved.

  Since the output member (120, 122) is preferably made of a material having a low resistivity, a Cu alloy or the like having improved heat resistance is used as a low resistivity metal even at the operating temperature (600 ° C. or higher) of the fuel cell (1). It can also be used.

  In the present invention, by covering the output member (120, 122) with the core part and the clad part whose main component is a material having higher heat resistance than the core part, for example, the core part has relatively high heat resistance. By using a material that is inferior but having a low resistance value and covering the core with a material having high heat resistance, an output member (120, 122) having low resistance and high heat resistance can be obtained.

Here, the “main component” means a component having the highest content among the components of the material.
In particular, in the present invention, when the core portion of the output member (120, 122) is formed of a material mainly composed of Cu, the resistance value of the output member (120, 122) can be reduced at a low cost. it can.

  -Moreover, in this invention, when the clad part of an output member (120,122) is formed with the material which has Ni as a main component, the surface of an output member (120,122) has Ni as a main component with high heat resistance. Therefore, it is possible to obtain an output member (120, 122) having high heat resistance.

1 is a perspective view showing an appearance of a solid oxide fuel cell 1 in a first embodiment. It is AA sectional drawing shown in FIG. It is an enlarged view of the connection part of the output terminal members 130 and 132 and the output conductive members 134 and 136 of the solid oxide fuel cell 2 in the second embodiment. It is a general | schematic external view of the solid oxide fuel cell 3 in 3rd Embodiment. It is a general | schematic external view of the solid oxide fuel cell 4 in 4th Embodiment.

Embodiments to which the present invention is applied will be described below with reference to the drawings. The embodiment of the present invention is not limited to the following embodiment, and can take various forms as long as they belong to the technical scope of the present invention.
[First Embodiment]
(Schematic configuration of the solid oxide fuel cell 1)
FIG. 1 is a perspective view showing an appearance of a solid oxide fuel cell 1 to which the present invention is applied.

  As shown in FIG. 1, a solid oxide fuel cell 1 is a device that generates power by receiving supply of a fuel gas (for example, hydrogen) and an oxidant gas (for example, air (specifically, oxygen in the air)). A solid oxide fuel cell stack (hereinafter simply referred to as a fuel cell stack) in which a plurality of (for example, 15) plate-like solid oxide fuel cell cells (hereinafter simply referred to as fuel cell cells) 6 as power generation units are stacked. 7) is provided. The solid oxide fuel cell 1 is usually housed in a heat insulating container 80.

  On both sides of the fuel cell stack 7 in the stacking direction, stack side output terminal portions (holding plates: end plates) 8 and 9 that press the plurality of fuel cells 6 and are used as output terminals of the fuel cell stack 7 are arranged. The fuel cell stack 7 is fastened and fixed by first to eighth fixing members 11 to 25 passing through the fuel cell stack 7 in the stacking direction via the end plates 8 and 9 and integrated. ing.

  Further, as shown in FIG. 1, the first to eighth fixing members 11 to 25 are arranged so as to penetrate through holes 53 to 67 formed in the frame portion 51 of the fuel cell stack 7, so that the fuel cell stack 7. Are pressed in the laminating direction to be fixed integrally, and are respectively composed of bolts 11a to 25a (through the through holes 53 to 67) and nuts 11b to 25b screwed to the bolts.

  Among these, the bolt 21a of the sixth fixing member 21 is used as a flow path for supplying fuel gas, and its tip (upper in FIG. 1) is connected to the fuel supply pipe 21c. The fuel supply pipe 21 c is connected to an auxiliary device such as a reformer (not shown), a vaporizer (not shown), a preheater (not shown), etc. in the heat insulating container 80. It is piped through the bottom or side. Note that the shape of the pipe, the route design, and the like can be changed as appropriate. Moreover, you may arrange | position an auxiliary device below in the heat insulation container 80 inside. Furthermore, the auxiliary device can be formed to be stackable (eg, as an auxiliary layer) and integrated with the stack.

The fuel gas can be supplied from the lower side in FIG. 1 of the heat insulating container 80 by the fuel supply pipe 21c thus piped.
Further, the bolt 13a of the second fixing member 13 is used as a flow path for discharging the fuel gas, and its tip (upper in FIG. 1) is connected to the fuel exhaust pipe 13c. The fuel exhaust pipe 13 c is connected to an auxiliary device such as a combustor (not shown) inside the heat insulating container 80, and is piped through the bottom surface or side surface of the heat insulating container 80.

Thus, the exhaust gas after reaction can be exhausted from the lower side of the heat insulating container 80 in FIG. 1 by the piped fuel exhaust pipe 13c.
Further, the bolt 25a of the eighth fixing member 25 is used as a flow path for supplying air, and an air supply pipe 25c from the tip (upper side in FIG. 1) is connected to a preheater (not shown) inside the heat insulating container 80. 1), and piped so as to pass through the bottom surface or the side surface of the heat insulating container 80, so that air can be supplied from below the heat insulating container 80 in FIG.

    Further, the bolt 17a of the fourth fixing member 17 is used as a flow path for discharging air, and an air exhaust pipe 17c is connected to the combustor (FIG. (Not shown) or the like, and is piped to penetrate the bottom surface or the side surface of the heat insulating container 80 so that the exhaust gas after the reaction can be discharged from the lower part of the heat insulating container 80 in FIG.

The first, third, fifth, and seventh fixing members 11, 15, 19, and 23 are used to fix the fuel cell stack 7.
(Configuration of power output portion of solid oxide fuel cell 1)
2 shows a part of the cross section of the fuel cell stack 7 (part of the AA cross section of FIG. 1), for example, the bolt 19a of the fifth fixing member 19 is formed of a heat-resistant metal, The fuel cell stack 7 is inserted into the through hole 61, and the nut 19b is tightened and fixed.

Further, both end plates 8.9 are made of, for example, a stainless steel plate having excellent heat resistance and conductivity.
And between the nut 19b and the end plate 8, the output member 120 for taking out electric power out of the fuel cell stack 7 is fastened by the bolt 19a and the nut 19b and fixed so as to be in surface contact with the end plate 8. Has been. Similarly, the output member 122 is fastened between the bolt 19a and the end plate 9 by the bolt 19a and the nut 19b so as to be in surface contact with the end plate 9.

  Further, a plate-like insulator 69 made of, for example, mica ceramic is provided between the bolt 19a, the nut 19b, and the end plates 8 and 9 so that the fifth fixing member 19 and the output members 120 and 122 are not short-circuited. , 71 are arranged.

  In addition, cylindrical insulating spacers 73 and 75 made of, for example, mica ceramic are fitted into the upper and lower ends of the through hole 61, and the bolt 19a is inserted into the through holes of the insulating spacers 73 and 75. . That is, the insulating spacers 73 and 75 are disposed in the through hole 61 so that the bolt 19 a does not contact the inner peripheral surface of the through hole 61.

  Note that the configuration in which the fifth fixing member 19 is assembled with the fuel cell stack 7 while maintaining the insulating properties using the insulating spacers 73 and 75 is the same for the other fixing members, and thus the description thereof is omitted.

  The output members 120 and 122 are made of a Cu alloy having improved heat resistance, or a clad portion that uses a metal having high conductivity as a core portion and covers the core portion with a metal having high heat resistance. As the specific example of the former, alumina dispersion strengthened copper is used, and as the specific example of the latter, Cu or an alloy material containing Cu as a main component is used for the core portion, and Ni is used as the main component for the clad portion covering the core portion. Some use materials.

(Characteristics of solid oxide fuel cell 1)
In the solid oxide fuel cell 1 as described above, the electric power generated by the fuel cell stack 7 is output from the end plates 8 and 9. Electric power is output from the output members 120 and 122 fixed so as to be in surface contact with 8 and 9.

Therefore, in reducing the output loss of the output power, the size and shape of the output members 120 and 122 themselves can be optimized.
That is, since the end plates 8 and 9 and the output members 120 and 122 are in surface contact with each other, the contact resistance between the end plates 8 and 9 and the output members 120 and 122 and the resistance of the output members 120 and 122 themselves are reduced. By doing so, the stability of the contact between the fuel cell stack 7 and the output members 120 and 122 is ensured, the degree of freedom of the structure for power output is improved, and the solid oxide fuel cell 1 is reduced in size. Can do.

  The output members 120 and 122 use a Cu alloy with improved heat resistance, or cover the core portion with a core portion and a clad portion mainly composed of a material having higher heat resistance, for example, Ni. In addition, by using a material having a relatively low heat resistance but a low resistance value and covering the core portion with a material having a high heat resistance, the output members 120 and 122 having a low resistance and a high heat resistance can be obtained.

Here, the “main component” means a component having the highest content among the components of the material.
In particular, since the core part is formed of a material mainly composed of Cu, the resistance values of the output members 120 and 122 can be reduced at low cost.

  Further, the clad portion is formed of a material mainly composed of Ni or the like. That is, since the surfaces of the output members 120 and 122 are coated with a material mainly composed of Ni having high heat resistance, the output members 120 and 122 having high heat resistance can be obtained.

  Further, when the fuel cell stack 7 is accommodated in the heat insulating container 80, the temperature is lower in the lower part than in the upper part in the heat insulating container 80. Therefore, as in the case of the solid oxide fuel cell 1, if the output of the electric power generated by the fuel cell stack 7, the supply of fuel gas or air, and the exhaust are performed below the heat insulating container 80, the heat insulating container The outflow of the heat inside 80 to the outside can be suppressed.

[Second Embodiment]
Next, as a second embodiment, a solid oxide fuel cell 2 in which output members 120 and 122 are composed of output terminal members 130 and 132 and output conductive members 134 and 136 will be described with reference to FIG. FIG. 3 is an enlarged view of a connection portion between the output terminal members 130 and 132 and the output conductive members 134 and 136. In the second embodiment, since only the configuration of the output members 120 and 122 is different from that of the first embodiment, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted.

  In the solid oxide fuel cell 2, as shown in an enlarged view in FIG. 3, the output member 120 includes an output terminal member 130 that comes into contact with the end plate 8 and an output for outputting electric power from the output terminal member 130 to the outside. The conductive member 134 is connected.

  Then, both the output terminal member 130 and the output conductive member 134, or the output conductive member 134 are composed of a core portion made of the above-mentioned heat-resistant Cu alloy or a material mainly containing Cu, and a core portion. The main component is a material mainly composed of Ni having high heat resistance, and the clad portion covers the core portion.

  The output terminal member 130 is formed in a thick plate shape, and a blind hole 81 is provided from the outside of the side wall to the inside. Inside the blind hole 81, a thin conductive intermediate material 85 made of silver (or a silver alloy containing silver as a main component) and having high conductivity is disposed. Specifically, a conductive intermediate material 85 made of an AgPd alloy is disposed between the side wall portion of the blind hole 81 and the output conductive member 134 so as to be in close contact with both surfaces.

The output conductive member 134 is formed in a round bar shape, and is inserted into the blind hole 81 of the output terminal member 130 and fixed to the output terminal member 130.
Further, instead of inserting the output terminal member 130 into the blind hole 81, the blind hole 81 of the output terminal member 130 and the output conductive member 134 may be threaded. In this case, by screwing until the leading end portion 87 of the output conductive member 134 comes into contact with the bottom portion 89 of the blind hole 81, the contact area is increased as compared with a normal bar, and the connection strength is increased.

Further, a bolt 19 a is inserted into a through hole 82 provided in the plate-like output terminal member 130, and is fastened by a nut 19 b to be fixed to the end plate 8 in contact.
The output member 122 at the lower end has the same configuration as the output member 120 at the upper end.

  In the solid oxide fuel cell 2 in which the output members 120 and 122 have such a structure, the shape of the output terminal members 130 and 132 is in contact with the end plates 8 and 9 such as a cylindrical shape to extract electric power. By using a suitable shape, the output conductive members 134 and 136 can have a shape suitable for external output of power, such as a round bar shape, and by using a material that is easy to process such as a round bar shape material. Cost reduction can be achieved.

  Moreover, the resistance value of the output conductive members 134 and 136 can be reduced by increasing the diameter of the round bars of the output conductive members 134 and 136. Furthermore, since the output terminal members 130 and 132 and the output conductive members 134 and 136 can be manufactured separately, the cost can be reduced.

  Further, the output conductive members 134 and 136 are made of the heat-resistant Cu alloy, or a core portion formed of a material mainly composed of Cu and a material mainly composed of Ni having higher heat resistance. By covering with a clad portion as a main component, Cu having a low resistance value and covering the core portion with a material having high heat resistance, the conductive members for output 134 and 136 having low resistance and high heat resistance can be obtained. can do.

[Third Embodiment]
In the third embodiment, a solid oxide fuel cell 3 configured to output electric power downward will be described with reference to FIG. FIG. 4 is a schematic external view of the solid oxide fuel cell 3. In the third embodiment, since only the configuration of the output terminal members 130 and 132 is different from that of the second embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  In the solid oxide fuel cell 3, as shown in FIGS. 4 (a) and 4 (b), the output terminal member 130 is formed in a strip-like shape, and the left end in the longitudinal direction in FIG. 4 (a). A through hole 83 is provided on the side. Bolts 15 a are inserted into the through holes 83 and fastened to the end plate 8 with nuts 15 b, and the other end side is fixed so as to protrude from the side surface side of the solid oxide fuel cell 3.

  Further, a blind hole 81 is provided on the bottom of the output terminal member 130 on the right end side in the longitudinal direction in FIG. 4A in parallel with the bolt 19a (up and down direction in FIG. 4B). The output conductive member 134 is formed in a round bar shape, and one end thereof is inserted into the blind hole 81 of the output terminal member 130 and fixed to the output terminal member 130.

  Similarly, the output terminal member 132 is fixed to the end plate 9 with bolts 19 a and nuts 19 b, and one end of the output conductive member 136 formed in a round bar shape is inserted into the output terminal member 132 and fixed to the output terminal member 132. Has been.

  Then, the output conductive members 134 and 136 extend downward in FIG. 4B and pass through the bottom surface of the heat insulating container 80, whereby the power generated by the fuel cell stack 7 is output from the heat insulating container 80 to the outside. It has become so.

  Here, similarly to the second embodiment, the output terminal members 130 and 132 and the output conductive members 134 and 136 include a core portion formed of a material mainly composed of Cu, and Ni having higher heat resistance than the core portion. And a clad part covering the core part.

  In such a solid oxide fuel cell 3, the same effect as in the second embodiment can be obtained, and furthermore, the generated power can be output to the lower side of the solid oxide fuel cell 3. It can be made into a compact shape according to the shape.

Moreover, even if the generated electric power is output to the upper side of the solid oxide fuel cell 3, it can be similarly compact according to the shape of the installation place.
[Fourth Embodiment]
In the fourth embodiment, a solid oxide fuel cell 4 in which output terminal members 130 and 132 are integrated with an end plate will be described with reference to FIG. FIG. 5 is a schematic external view of the solid oxide fuel cell 4. In the fourth embodiment, since only the configuration of the output terminal members 130 and 132 is different from that of the third embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  In the solid oxide fuel cell 4, as shown in FIGS. 5 (a) and 5 (b), instead of the output terminal members 130 and 132 of the solid oxide fuel cell 3 in the third embodiment, end plates are used. The integrated end plates 70 and 90 integrated with 8 and 9 are formed so as to protrude to the right side surface of the solid oxide fuel cell 4 in FIGS. 5A and 5B. .

  5B, a blind hole 81 is parallel to the bolt 19a on the bottom of the integrated end plates 70, 90 protruding from the right side in FIG. 5B. Direction).

The output conductive member 134 is formed in a round bar shape, and one end thereof is inserted into the blind hole 81 of the integrated end plate 70 and fixed.
Similarly, one end of the output conductive member 136 formed in a round bar shape is inserted into the blind hole 81 of the integrated end plate 90 and fixed.

  Further, the output conductive members 134 and 136 are extended downward in FIG. 5B and penetrate through the bottom surface of the heat insulating container 80, whereby the electric power generated by the fuel cell stack 7 is output from the heat insulating container 80 to the outside. It has become so.

In such a solid oxide fuel cell 4, the same effect as the solid oxide fuel cell 3 of the third embodiment can be obtained.
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, A various aspect can be taken.

(1) In the second embodiment, the output terminal members 130 and 132 are formed in a cylindrical shape, but may be formed in a thick strip shape.
(2) In the second to fourth embodiments, the output conductive members 134 and 136 are round bar shapes, but may not be round bar shapes. In the case of a shape other than the round bar shape, the end portion and the inner surface of the blind hole 81 may be threaded and screwed into the blind holes 81 of the output terminal members 130 and 132 to be fixed.

  (3) The fuel cell stack 7 is an assembly formed by stacking a plurality of single cells using conductive interconnectors. Each of the solid oxide fuel cells 1, 2, 3, 4, and 5 is a power generation device that is composed of a single cell or an assembly (stack) of a plurality of single cells and can output electric power to the outside. .

  In the above embodiment, the fuel cell stack 7 in which a plurality of fuel cells 6 (so-called single cells) are stacked is used. However, in addition to the fuel cells 6, auxiliary layers such as a reforming layer, a combustion layer, or a support layer are provided. You may laminate.

  1, 2, 3, 4 ... solid oxide fuel cell, 6 ... solid oxide fuel cell (fuel cell), 7 ... solid oxide fuel cell stack (fuel cell stack), 8 ... first end Plate (end plate), 9 ... 2nd end plate (end plate), 11, 13, 15, 17, 19, 21, 23, 25 ... Fixing member, 11a, 13a, 15a, 17a, 19a, 21a, 23a, 25a ... bolt, 11b, 13b, 15b, 17b, 19b, 21b, 23b, 25b ... nut, 13c ... fuel exhaust pipe, 17c ... air exhaust pipe, 21c ... fuel supply pipe, 25c ... air supply pipe, 70, 90 ... Integrated end plate, 80 ... Thermal insulation container, 85 ... Conductive intermediate material, 120, 122 ... Output member, 130, 132 ... Output terminal member, 134, 136 ... Output Conductive members.

Claims (7)

In a fuel cell including a fuel cell that is housed in a heat insulating container and has a fuel electrode and an oxidant electrode disposed on both sides of a plate-like electrolyte layer, and generates electric power by a reaction between the fuel gas and the oxidant gas.
An end plate that is arranged in the thickness direction of the electrolyte layer, sandwiches the fuel cell stack in which one fuel cell or a plurality of the fuel cells are stacked from both ends, and takes out the generated electric power;
A plurality of fixing members that pass through the fuel cell stack and the end plate in the stacking direction and fasten and fix;
An output member that further outputs the electric power extracted by the end plate to the outside of the heat insulating container;
With
The output member is
A fuel cell, wherein the fuel cell is disposed between the fixing member and the end plate and is in surface contact with the end plate. In a fuel cell including a fuel cell that is housed in a heat insulating container and has a fuel electrode and an oxidant electrode disposed on both sides of a plate-like electrolyte layer, and generates electric power by a reaction between the fuel gas and the oxidant gas.
An end plate that is arranged in the thickness direction of the electrolyte layer, sandwiches the fuel cell stack in which one fuel cell or a plurality of the fuel cells are stacked from both ends, and takes out the generated electric power;
An output member that further outputs the electric power extracted by the end plate to the outside of the heat insulating container;
With
The output member is
The core,
A fuel cell comprising a material having a heat resistance higher than that of the core portion as a main component, a clad portion covering the core portion, and being integrally formed with the end plate. The output member is
It is fixed to the end plate by a fixing member,
An output terminal member in surface contact with the end plate;
The fuel according to claim 1, further comprising: an output conductive member that is electrically connected to the output terminal member and outputs electric power from the output terminal member to the outside of the heat insulating container. battery. The output member is
The fuel cell according to any one of claims 1 to 3, wherein the fuel cell is configured to be electrically connected to the outside from below the heat insulating container. The output member is
The core,
A material having a heat resistance higher than that of the core part as a main component, and a clad part covering the core part,
5. The fuel cell according to claim 1, wherein the fuel cell is provided. The output member is
The fuel cell according to claim 2 or 5, wherein the core portion is formed of a material containing Cu as a main component. The output member is
The fuel cell according to claim 5 or 6, wherein the clad portion is formed of a material mainly composed of Ni.