JP4311430B2 - FUEL CELL DEVICE AND ELECTRONIC DEVICE EQUIPPED WITH THE SAME - Google Patents

Description

  The present invention relates to a fuel cell device that extracts electric power by an electrochemical reaction between fuel gas and oxygen, and an electronic device including the same.

  Fuel cells take out electric power through the electrochemical reaction between hydrogen and oxygen, and research and development of fuel cells are widely conducted as the next-generation mainstream power supply system. Development of a high solid oxide fuel cell (hereinafter referred to as SOFC) is in progress.

The SOFC uses a power generation cell in which a fuel electrode is formed on one surface of a solid oxide electrolyte and an oxygen electrode is formed on the other surface.
Oxygen supplied to the oxygen electrode becomes ions (O ²⁻ ) and permeates the solid oxide electrolyte and reaches the fuel electrode. O ²⁻ oxidizes the fuel gas supplied to the fuel electrode and emits electrons. Here, the fuel gas is mainly hydrogen gas. For example, hydrogen gas obtained by reforming a fuel containing hydrogen atoms such as methanol in its composition or carbon monoxide as a by-product is used.

  Electrons return to the oxygen electrode from the cathode output electrode connected to the oxygen electrode via the external circuit from the anode output electrode connected to the fuel electrode, and ionize oxygen. Thus, the chemical energy of the fuel gas and oxygen is converted into electric energy.

Since the SOFC reaction is performed at a high temperature (about 500 to 1000 ° C.), the power generation cell is accommodated in a heat insulating container, and a fuel gas and oxygen supply channel, a pipe serving as an exhaust gas discharge channel, an anode output electrode, The cathode output electrode passes through the heat insulating container and is connected to the power generation cell (see, for example, Patent Document 1).
JP 2004-30972 A

  By the way, in SOFC, since the operating temperature of the power generation cell is high, the temperature difference between the piping exposed outside, the anode output electrode, the cathode output electrode, and the power generation cell is large, and the heat loss through these tends to increase. In addition, for example, as the temperature of the power generation cell is increased at startup, the piping and the output electrode are thermally expanded, so that the apparatus may be damaged due to thermal stress.

  An object of the present invention is to reduce heat loss of a fuel cell device and prevent damage to the device due to thermal stress.

In order to solve the above-described problems, the invention described in claim 1 includes a heat insulating container, a reformer that is housed in the heat insulating container and is supplied with raw fuel to generate fuel gas, and is housed in the heat insulating container. The power generation cell is set to a temperature higher than that of the reformer, the fuel gas is supplied, and electric power is taken out by an electrochemical reaction of the fuel gas, one end is connected to the power generation cell, and the other end is the heat insulating container. An output electrode that is led out from the wall surface, the output electrode has a stress relaxation structure having a plurality of bent portions, and from the wall surface from which the output electrode of the heat insulating container is drawn to the power generation cell. The distance is longer than the distance from the wall surface to the reformer.

  A second aspect of the present invention is the fuel cell device according to the first aspect, wherein the cross-sectional shape of the output electrode is any one of a square, a triangle, and a circle.

  Invention of Claim 3 is a fuel cell apparatus of Claim 1, Comprising: The said fuel cell apparatus has the housing | casing which accommodates the said electric power generation cell, and the said output electrode penetrates, The said output electrode And the casing is made of the same material.

Invention of Claim 4 is a fuel cell apparatus of Claim 1 , Comprising: The said stress relaxation structure is the space between the said wall surface from which the said output electrode of the said heat insulation container is pulled out, and the said reformer It is provided in the inside.

A fifth aspect of the present invention is the fuel cell device according to the first aspect , wherein the output electrode is bent at a right angle at a bent portion of the output electrode in the stress relaxation structure. .

The invention according to claim 6 is the fuel cell device according to claim 1 , wherein the output electrode is bent in an arc shape at a bent portion of the output electrode in the stress relaxation structure. To do.

A seventh aspect of the present invention is the fuel cell device according to the first aspect , wherein the output electrode is bent in a distorted manner at a bent portion of the output electrode in the stress relaxation structure. And

The invention according to claim 8 is the fuel cell device according to claim 1, wherein the fuel cell device includes a first connecting portion that connects the heat insulating container and the reformer, and the modified battery. A second connecting portion that connects the mass device and the power generation cell, and the distance from the wall surface of the heat insulating container to the one end of the output electrode connected to the power generation cell is the second distance from the wall surface. It is characterized by being longer than the distance to the connecting part.

The invention according to claim 9 is the fuel cell device according to claim 8 , wherein the fuel cell device has a housing that houses the power generation cell and through which the output electrode penetrates. The connecting portion, the reformer, the second connecting portion, the casing, and the output electrode are made of the same material.

A tenth aspect of the present invention is the fuel cell apparatus according to the eighth aspect , wherein the fuel cell apparatus includes a housing that houses the power generation cell and through which the output electrode passes, The connecting portion, the reformer, the second connecting portion, the casing, and the output electrode are made of a Ni-based alloy.

The invention according to claim 11 is the fuel cell device according to claim 8 , wherein the first connecting portion is provided with a vaporizer for vaporizing the raw fuel by heat propagating from the reformer. It is characterized by.

The invention described in claim 12 is the fuel cell device according to claim 1, wherein the fuel cell device further includes a combustor that burns unreacted fuel gas discharged from the power generation cell. Features.

A thirteenth aspect of the present invention is the fuel cell device according to the first aspect, wherein the reformer performs a reforming reaction by heat propagated from the power generation cell.

A fourteenth aspect of the present invention is the fuel cell device according to the first aspect, wherein a solid oxide electrolyte is used for the power generation cell.

The invention according to claim 15 is a heat insulating container, a reformer that is housed in the heat insulating container and is supplied with raw fuel to generate fuel gas, and is housed in the heat insulating container and is hotter than the reformer. And a power generation cell that is supplied with the fuel gas and extracts power by an electrochemical reaction of the fuel gas, and an output electrode that has one end connected to the power generation cell and the other end drawn out from the wall surface of the heat insulating container And the output electrode has a stress relaxation structure having a plurality of bent portions, and the distance from the wall surface from which the output electrode of the heat insulating container is drawn to the power generation cell is from the wall surface to the reforming And a load connected to the other end of the output electrode of the fuel cell device and driven by the electric power taken out from the power generation cell. It is.

The invention according to claim 16 is the electronic device according to claim 15 , wherein the fuel cell device includes a first connecting portion that connects the heat insulating container and the reformer, and the reforming. And a second connecting portion that connects between the generator and the power generation cell, and the distance from the wall surface of the heat insulating container to one end of the output electrode connected to the power generation cell is the second connection from the wall surface. It is characterized by being longer than the distance to the part.

The invention according to claim 17 is the electronic device according to claim 15 , wherein the fuel cell device includes a housing that houses the power generation cell and through which the output electrode passes, The casing is made of the same material.

The invention according to claim 18 is the electronic apparatus according to claim 15 , wherein a solid oxide electrolyte is used for the power generation cell in the fuel cell device.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the heat loss of a power generation cell, the failure | damage of the apparatus by a thermal stress can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is a block diagram showing a portable electronic device 100 equipped with a fuel cell device 1. The electronic device 100 is a portable electronic device such as a notebook personal computer, a PDA, an electronic notebook, a digital camera, a mobile phone, a wristwatch, a register, and a projector.

  The fuel cell device 1 includes a fuel container 2, a pump 3, a heat insulation package 10, and the like. The fuel container 2 of the fuel cell device 1 is provided, for example, so as to be detachable from the electronic device 100, and the pump 3 and the heat insulation package 10 are incorporated in the main body of the electronic device 100, for example.

The fuel container 2 stores a mixed liquid of liquid raw fuel (for example, methanol, ethanol, dimethyl ether) and water. The liquid raw fuel and water may be stored in separate containers.
The pump 3 sucks the liquid mixture in the fuel container 2 and sends it to the vaporizer 4 in the heat insulation package 10.

A box-shaped heat insulation package 10 contains a vaporizer 4, a reformer 6, a power generation cell 8, and a catalytic combustor 9. The atmospheric pressure in the heat insulation package 10 is kept at a vacuum pressure (for example, 10 Pa or less).
The vaporizer 4, the reformer 6, and the catalytic combustor 9 are provided with electric heaters and temperature sensors 4a, 6a, and 9a, respectively. Since the electric resistance values of the electric heater / temperature sensors 4a, 6a, 9a depend on the temperature, the electric heater / temperature sensors 4a, 6a, 9a measure the temperatures of the vaporizer 4, the reformer 6, and the catalytic combustor 9. It also functions as a temperature sensor.

  The liquid mixture sent from the pump 3 to the vaporizer 4 is heated to about 110 to 160 ° C. by the heat of the electric heater / temperature sensor 4a and the catalytic combustor 9, and evaporates. The gas mixture vaporized in the vaporizer 4 is sent to the reformer 6.

A flow path is formed inside the reformer 6, and a catalyst is supported on the wall surface of the flow path. The air-fuel mixture sent from the vaporizer 4 to the reformer 6 flows through the flow path of the reformer 6 and is heated to about 300 to 400 ° C. by the heat of the electric heater / temperature sensor 6a and the catalytic combustor 9, The reaction is caused by the catalyst. A mixed gas (reformed gas) such as hydrogen, carbon dioxide, and a small amount of carbon monoxide as a by-product is generated by a catalytic reaction between the raw fuel and water. When the raw fuel is methanol, the reformer 6 mainly performs a steam reforming reaction as shown in the following formula (1).
CH ₃ OH + H ₂ O → 3H ₂ + CO ₂ (1)

Carbon monoxide is by-produced in a trace amount by an equation such as the following equation (2) that occurs sequentially following the chemical reaction equation (1).
H ₂ + CO ₂ → H ₂ O + CO (2)
The generated reformed gas is sent to the power generation cell 8.

  FIG. 2 is a schematic diagram of the power generation cell 8, and FIG. 3 is a schematic diagram showing an example of the power generation cell stack. As shown in FIG. 2, the power generation cell 8 is joined to the fuel electrode 82, a solid oxide electrolyte 81, a fuel electrode 82 (anode) and an oxygen electrode 83 (cathode) formed on both surfaces of the solid oxide electrolyte 81. The anode collector electrode 84 having a flow path 86 formed on the bonding surface thereof and the cathode collector electrode 85 bonded to the oxygen electrode 83 and having a flow path 87 formed on the bonding surface thereof. The power generation cell 8 is accommodated in the housing 90.

The solid oxide electrolyte 81 includes zirconia-based (Zr _1-x Y _x ) O _{2-x / 2} (YSZ), lanthanum galade-based (La _1-x Sr _x ) (Ga _1-yz Mg _y Co _z ) O ₃ or the like, La _0.84 Sr _0.16 MnO ₃ , La (Ni, Bi) O ₃ , (La, Sr) MnO ₃ , In ₂ O ₃ + SnO ₂ , LaCoO _3, etc. Ni, Ni + YSZ or the like can be used for 83, and LaCr (Mg) O ₃ , (La, Sr) CrO ₃ , NiAl + Al ₂ O ₃ or the like can be used for the anode collector electrode 84 and the cathode collector electrode 85, respectively.

The power generation cell 8 is heated to about 500 to 1000 ° C. by the heat of the electric heater / temperature sensor 9a and the catalytic combustor 9, and the reaction described later takes place.
Air is sent to the oxygen electrode 83 through the channel 87 of the cathode collector electrode 85. In the oxygen electrode 83, oxygen ions are generated by oxygen and electrons supplied from the cathode output electrode 21b as shown in the following equation (3).
O ₂ + 4e ⁻ → 2O ²⁻ (3)
The solid oxide electrolyte 81 has oxygen ion permeability, and allows oxygen ions generated at the oxygen electrode 83 to pass through to reach the fuel electrode 82.

The reformed gas discharged from the reformer 6 is sent to the fuel electrode 82 through the flow path 86 of the anode collector electrode 84. In the oxygen electrode 83, a reaction represented by the following equations (4) and (5) occurs between the oxygen ions that have passed through the solid oxide electrolyte 81 and the reformed gas. Electrons emitted to the fuel electrode 82 are supplied to the oxygen electrode 83 from the cathode output electrode 21b through external circuits such as the anode output electrode 21a and the DC / DC converter 902.
H ₂ + O ²⁻ → H ₂ O + 2e ⁻ (4)
CO + O ²⁻ → CO ₂ + 2e ⁻ (5)

An anode output electrode 21 a and a cathode output electrode 21 b are connected to the anode collector electrode 84 and the cathode collector electrode 85, and are drawn out through the housing 90. Here, as will be described later, the housing 90 is formed of, for example, a Ni-based alloy, and the anode output electrode 21a and the cathode output electrode 21b are insulated and pulled out from the housing 90 by an insulating material such as glass or ceramic. As shown in FIG. 1, the anode output electrode 21a and the cathode output electrode 21b are connected to, for example, a DC / DC converter 902.
As shown in FIG. 3, a cell stack 80 in which a plurality of power generation cells 8 including an anode collector electrode 84, a fuel electrode 82, a solid oxide electrolyte 81, an oxygen electrode 83, and a cathode collector electrode 85 are connected in series may be used. . In this case, as shown in FIG. 3, the anode collector electrode 84 of the power generation cell 8 at one end connected in series is used as the anode output electrode 21a, and the cathode collector electrode 85 of the power generation cell 8 at the other end is used as the cathode. Connected to the output electrode 21b. In this case, the cell stack 80 is accommodated in the housing 90.

  The DC / DC converter 902 converts the electrical energy generated by the power generation cell 8 into an appropriate voltage, and then supplies it to the electronic device main body 901. Further, the DC / DC converter 902 charges the secondary battery 903 with the electrical energy generated by the power generation cell 8, and the electrical energy stored in the secondary battery 903 is stored in the electronic device main body when the power generation cell 8 is not operating. 901 is supplied.

  The reformed gas (off-gas) that has passed through the flow path of the anode collector electrode 84 also contains unreacted hydrogen. The off gas is supplied to the catalytic combustor 9.

Air that has passed through the flow path 87 of the cathode collector electrode 85 is supplied to the catalytic combustor 9 together with the off-gas. A flow path is formed inside the catalytic combustor 9, and a Pt-based catalyst is supported on the wall surface of the flow path.
The catalytic combustor 9 is provided with an electric heater / temperature sensor 9a made of an electric heating material. Since the electric resistance value of the electric heater / temperature sensor 9a depends on the temperature, the electric heater / temperature sensor 9a also functions as a temperature sensor for measuring the temperature of the catalytic combustor 9.

  A mixed gas (combustion gas) of off gas and air flows through the flow path of the catalytic combustor 9 and is heated by the electric heater / temperature sensor 9a. Of the combustion gas flowing through the flow path of the catalytic combustor 9, hydrogen is combusted by the catalyst, thereby generating combustion heat. The exhaust gas after combustion is discharged from the catalytic combustor 9 to the outside of the heat insulation package 10.

  The combustion heat generated in the catalytic combustor 9 is used to maintain the temperature of the power generation cell 8 at a high temperature (about 500 to 1000 ° C.). The heat of the power generation cell 8 is conducted to the reformer 6 and the vaporizer 4 and used for evaporation in the vaporizer 4 and a steam reforming reaction in the reformer 6.

Next, a specific configuration of the heat insulation package 10 will be described.
4 is a perspective view of the heat insulation package 10, FIG. 5 is a perspective view showing the internal structure of the heat insulation package 10, and FIG. 6 is a perspective view of the internal structure of the heat insulation package 10 of FIG. 7 is a cross-sectional view taken along arrow VII-VII in FIG. As shown in FIG. 4, the inlet of the vaporizer 4, the connecting portion 5, the anode output electrode 21 a, and the cathode output electrode 21 b protrude from one wall surface of the heat insulation package 10.

  As shown in FIGS. 5 to 7, the vaporizer 4, the connecting portion 5, the reformer 6, the connecting portion 7, and the fuel cell portion 20 are arranged in this order in the heat insulating package 10. The fuel cell unit 20 is formed by integrally forming a casing 90 that houses the power generation cell 8 and the catalytic combustor 9, and off gas is supplied from the fuel electrode 82 of the power generation cell 8 to the catalytic combustor 9.

  The casing 90 and the catalytic combustor 9 for housing the power generation cells 8 of the carburetor 4, the connecting part 5, the reformer 6, the connecting part 7, and the fuel cell part 20 are made of a metal having high temperature durability and appropriate thermal conductivity. For example, it can be formed using a Ni-based alloy such as Inconel 783. In particular, the anode output electrode 21a and the cathode output electrode 21b connected to the anode collector electrode 84 and the cathode collector electrode 85 of the fuel cell unit 20 and drawn from the housing 90 have a coefficient of thermal expansion as the temperature of the power generation cell 8 increases. In order to suppress damage due to stress due to the difference, it is preferable that at least the anode output electrode 21a and the cathode output electrode 21b and the housing 90 are formed of the same material. Furthermore, in order to reduce the stress generated between the vaporizer 4, the connecting part 5, the reformer 6, the connecting part 7, the casing 90 of the fuel cell part 20 and the catalytic combustor 9 as the temperature rises, these are the same. It is preferable to form with the material.

  A radiation preventing film 11 is formed on the inner wall surface of the heat insulating package 10, and a radiation preventing film 12 is formed on the outer wall surface of the vaporizer 4, the connecting part 5, the reformer 6, the connecting part 7, and the fuel cell part 20. . The radiation preventing films 11 and 12 prevent heat transfer due to radiation, and for example, Au, Ag or the like can be used. It is preferable to provide at least one of the radiation preventing films 11 and 12, and it is more preferable to provide both.

  The vaporizer 4 penetrates the heat insulating package 10 together with the connecting portion 5, and the vaporizer 4 and the reformer 6 are connected by the connecting portion 5. The reformer 6 and the fuel cell unit 20 are connected by a connecting unit 7.

  As shown in FIG. 5 and FIG. 6, the vaporizer 4, the connecting portion 5, the reformer 6, the connecting portion 7, and the fuel cell portion 20 are integrally formed, and the connecting portion 5, the reformer 6, and the connecting portion are formed. 7. The lower surface of the fuel cell unit 20 is formed flush.

8 is a bottom view of the connecting portion 5, the reformer 6, the connecting portion 7, and the fuel cell portion 20, and FIG. 9 is a cross-sectional view taken along arrow IX-IX in FIG. 8 and 9, the anode output electrode 21a and the cathode output electrode 21b are omitted.
As shown in FIGS. 8 and 9, at the lower outer edge portion of the reformer 6 and the fuel cell unit 20, the recesses 61a, 61b, 22a, and the like for disposing the anode output electrode 21a and the cathode output electrode 21b, 22b is formed.

  Further, the portion connected to the connecting portion 7 of the reformer 6 is retreated with respect to the surface facing the fuel cell portion 20. For this reason, the distance between the fuel cell unit 20 and the reformer 6 is shortened to reduce the size of the apparatus while reducing the heat conduction from the fuel cell unit 20 to the reformer 6 by lengthening the connecting unit 7. Can do.

  As shown in FIG. 8, a wiring pattern 13 is formed on the lower surface of the connecting portion 5, the reformer 6, the connecting portion 7, and the fuel cell portion 20 after being subjected to insulation treatment with ceramic or the like. The wiring pattern 13 is formed in a distorted manner at the lower part of the vaporizer 4, the lower part of the reformer 6, and the lower part of the fuel cell unit 20, and serves as the electric heater / temperature sensors 4a, 6a, 9a, respectively. One end of each of the electric heater / temperature sensors 4a, 6a, 9a is connected to a common terminal 13a, and the other end is connected to three independent terminals 13b, 13c, 13d. These four terminals 13 a, 13 b, 13 c, and 13 d are formed at end portions that are outside the heat insulating package 10 of the connecting portion 5.

10 is a cross-sectional view taken along the line XX of FIG. 8, and FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG.
The connecting portions 5 and 7 are provided with supply passages 51 and 71 for air supplied to the oxygen electrode 83 of the power generation cell 8 and discharge passages 52 a, 52 b, 72 a and 72 b for exhaust gas discharged from the catalyst combustor 9. It has been. The connecting portion 5 is provided with a supply path 53 for gaseous fuel sent from the vaporizer 4 to the reformer 6. The connecting portion 7 is sent from the reformer 6 to the fuel electrode 82 of the power generation cell 8. A reformed gas supply flow path 73 is provided.

  As shown in FIG. 9, four flow paths 71, 72 a, 72 b, and 73 are provided inside the connecting portion 7, but the catalyst against the offgas and air supplied to the catalytic combustor 9 is provided. In order to make the exhaust gas flow path diameter discharged from the combustor 9 sufficiently large, two of these are used as the exhaust gas flow paths 72 a and 72 b from the catalytic combustor 9, and the other two are used for the power generation cell 8. The reformed gas supply channel 73 to the fuel electrode 82 and the air supply channel 71 to the oxygen electrode 83 are used.

The anode output electrode 21a and the cathode output electrode 21b are connected to a position where the distance between the anode output electrode 21a of the heat insulation package 10 and the wall surface penetrating the cathode output electrode 21b is longer than the connecting portion 7 of the fuel cell unit 20, and preferably , Connected to the end opposite to the connecting portion 7 and pulled out. The anode output electrode 21 a is drawn from the anode collector electrode 84, and the cathode output electrode 21 b is drawn from the cathode collector electrode 85 of the power generation cell 8. The anode output electrode 21a and the cathode output electrode 21b are disposed along the recesses 61a, 61b, 22a, and 22b of the fuel cell unit 20 and the reformer 6, and as shown in FIGS. It is bent at four places in the space between the wall surface and the reformer 6, and protrudes to the outside from the same wall surface as the wall surface of the heat insulating package 10 from which the inlet of the vaporizer 4 and the connecting portion 5 protrude.
The bent portions 23a and 23b serve as a stress relaxation structure between the fuel cell unit 20 and the heat insulating package 10 by deformation of the anode output electrode 21a and the cathode output electrode 21b.

  FIG. 12 is a schematic diagram showing the temperature distribution in the heat insulating package 10 during steady operation. As shown in FIG. 12, for example, when the fuel cell unit 20 is kept at about 800 ° C., vaporization from the fuel cell unit 20 to the reformer 6 via the connecting portion 7 and from the reformer 6 via the connecting portion 5 is performed. Heat moves outside the container 4 and the heat insulation package 10. As a result, the reformer 6 is maintained at about 380 ° C., and the vaporizer 4 is maintained at about 150 ° C.

  Further, the heat of the fuel cell unit 20 also moves outside the heat insulating package 10 via the anode output electrode 21a and the cathode output electrode 21b. For this reason, after starting the fuel cell device 1, the output electrodes 21a and 21b expand due to the temperature rise.

  FIG. 13 is a simulation diagram showing deformation of the anode output electrode 21a and the cathode output electrode 21b due to temperature rise. The anode output electrode 21a and the cathode output electrode 21b expand as the temperature of the fuel cell unit 20 rises, and deform from the shape shown by the two-dot chain line in FIG. 13 to the shape shown by the solid line.

  At this time, since the temperatures of the portions 24a and 24b on the fuel cell unit 20 side are higher than those of the bent portions 23a and 23b of the anode output electrode 21a and the cathode output electrode 21b, they extend more greatly. Here, one end of the anode output electrode 21 a and the cathode output electrode 21 b is connected to the anode collector electrode 84 and the cathode collector electrode 85 of the fuel cell unit 20, and the other end is joined to the wall surface on the vaporizer 4 side of the heat insulation package 10. Thus, the anode output electrode 21a and the cathode output electrode 21b are subjected to stress due to this extension. However, since the anode output electrode 21a and the cathode output electrode 21b have the bent portions 23a and 23b, the bent portions 23a and 23b can absorb the deformation due to the extension, and the heat insulating package 10 and the fuel cell portion 20 can be absorbed. The stress acting between the two can be relaxed.

  Moreover, since the heat transfer path by the anode output electrode 21a and the cathode output electrode 21b is lengthened by providing the bent portions 23a and 23b, the fuel cell unit 20 releases the heat insulation package 10 through the anode output electrode 21a and the cathode output electrode 21b. Heat loss can be reduced.

<Modification>
14, FIG. 15 and FIG. 16 are perspective views showing modifications of the internal structure of the heat insulation package. In the above embodiment, the anode output electrode 21a and the cathode output electrode 21b having a quadrangular cross section are used. However, for example, the anode output electrode 25a and the cathode output electrode 25b having a triangular cross section as shown in FIG. 14 may be used. . Further, an anode output electrode 26a and a cathode output electrode 26b having a circular cross section as shown in FIG. 15 may be used. Further, in the above-described embodiment, the bent portions 23a and 23b have three anode output electrodes 21a and cathode output electrodes 21b bent at right angles as shown in FIGS. 5 and 6. As shown in FIG. 14 and FIG. 15, the bent portion in the bent portion may be circularly bent so as to be bent smoothly. In this case, it is possible to suppress the stress from concentrating on the bent portion and to disperse the stress over the entire bent portion, and it is possible to suppress damage due to the stress.

  Alternatively, as illustrated in FIG. 16, an anode output electrode 27 a and a cathode output electrode 27 b in which a stress relaxation structure is formed in a coil shape in a space between the inner wall surface of the heat insulating package 10 and the reformer 6 may be used. In this case, it is possible to more favorably absorb the stress at the bent portion, and to prevent breakage due to the stress.

  Further, in the case of using the thin vaporizer 104, the reformer 106, and the fuel cell unit 120 in order to make the heat insulation package 10 thin, as shown in FIG. The formed anode output electrode 28a and cathode output electrode 28b may be used.

It is a block diagram which shows the portable electronic device carrying a fuel cell apparatus. It is a schematic diagram of a power generation cell. It is a schematic diagram which shows an example of a power generation cell stack. It is a perspective view of a heat insulation package. It is a perspective view which shows the internal structure of a heat insulation package. It is the perspective view which looked at the internal structure of the heat insulation package of FIG. 5 from the lower side. It is a VII-VII arrow sectional view of Drawing 4. It is a bottom view of a connection part, a reformer, a connection part, and a fuel cell part. It is IX-IX arrow sectional drawing of FIG. It is XX arrow sectional drawing of FIG. It is XI-XI arrow sectional drawing of FIG. It is a schematic diagram which shows the temperature distribution in the heat insulation package at the time of steady operation. It is a simulation figure which shows the deformation | transformation of the output electrode by a temperature rise. It is a perspective view which shows the modification of the internal structure of a heat insulation package. It is a perspective view which shows the modification of the internal structure of a heat insulation package. It is a perspective view which shows the modification of the internal structure of a heat insulation package. It is a perspective view which shows the modification of the internal structure of a heat insulation package.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell apparatus 4,104 Vaporizer 5 Connection part (1st connection part)
6,106 Reformer 7 Connecting part (second connecting part)
8 Power generation cell 9 Catalytic combustor 10 Thermal insulation package (thermal insulation container)
20, 120 Fuel cell section 21a, 25a, 26a, 27a, 28a Anode output electrode (output electrode)
21b, 25b, 26b, 27b, 28b Cathode output electrode (output electrode)
23a, 23b, 24a, 24b, 29a, 29b Bent part (stress relaxation structure)
80 cell stack 100 electronic equipment

Claims (18)

An insulated container;
A reformer housed in the heat insulating container and supplied with raw fuel to generate fuel gas;
A power generation cell housed in the heat insulating container, set at a higher temperature than the reformer, supplied with the fuel gas, and taking out electric power by an electrochemical reaction of the fuel gas;
An output electrode having one end connected to the power generation cell and the other end drawn out from the wall surface of the heat insulating container;
The output electrode has a stress relaxation structure having a plurality of bent portions,
The fuel cell device, wherein a distance from the wall surface from which the output electrode of the heat insulating container is drawn to the power generation cell is longer than a distance from the wall surface to the reformer.   2. The fuel cell device according to claim 1, wherein a cross-sectional shape of the output electrode is any one of a square, a triangle, and a circle.   2. The fuel according to claim 1, wherein the fuel cell device has a casing that houses the power generation cell and through which the output electrode penetrates, and the output electrode and the casing are made of the same material. Battery device. 2. The fuel cell device according to claim 1 , wherein the stress relaxation structure is provided in a space between the wall surface from which the output electrode of the heat insulating container is drawn and the reformer. At the bent portion of the output electrode in the stress relieving structure, the fuel cell system according to claim 1, wherein the output electrode is characterized by being bent at a right angle. At the bent portion of the output electrode in the stress relieving structure, the fuel cell system according to claim 1, wherein the output electrode is characterized by being bent in an arc shape. At the bent portion of the output electrode in the stress relieving structure, the fuel cell system according to claim 1, wherein the output electrode is bent in a zigzag shape. The fuel cell device includes a first connection part that connects the heat insulating container and the reformer, and a second connection part that connects the reformer and the power generation cell,
2. The fuel cell according to claim 1, wherein a distance from the wall surface of the heat insulating container to one end of the output electrode connected to the power generation cell is longer than a distance from the wall surface to the second connecting portion. apparatus. The fuel cell device includes a housing that houses the power generation cell and through which the output electrode penetrates. The first connecting portion, the reformer, the second connecting portion, the housing, and the output electrode are The fuel cell device according to claim 8, which is made of the same material. The fuel cell device includes a housing that houses the power generation cell and through which the output electrode penetrates. The first connecting portion, the reformer, the second connecting portion, the housing, and the output electrode are The fuel cell device according to claim 8 , which is made of a Ni-based alloy. The fuel cell device according to claim 8 , wherein the first connecting portion is provided with a vaporizer that vaporizes the raw fuel by heat propagating from the reformer.   The fuel cell apparatus according to claim 1, further comprising a combustor that burns unreacted fuel gas discharged from the power generation cell.   The fuel cell apparatus according to claim 1, wherein the reformer performs a reforming reaction by heat propagated from the power generation cell.   2. The fuel cell device according to claim 1, wherein a solid oxide electrolyte is used in the power generation cell. A heat insulating container, a reformer housed in the heat insulating container and supplied with raw fuel to generate fuel gas, and housed in the heat insulating container, set at a higher temperature than the reformer, and supplied with the fuel gas is a power generation cell draw power by an electrochemical reaction of the fuel gas, one end connected to said power generation cells includes an output electrode to which the other end is pulled out to the outside from the wall surface of the heat insulating container, wherein the output electrode A fuel cell device having a stress relaxation structure having a plurality of bent portions, wherein a distance from the wall surface from which the output electrode of the heat insulating container is drawn to the power generation cell is longer than a distance from the wall surface to the reformer When,
An electronic device comprising: a load connected to the other end of the output electrode of the fuel cell device and driven by the electric power taken out from the power generation cell. The fuel cell device includes a first connection part that connects the heat insulating container and the reformer, and a second connection part that connects the reformer and the power generation cell,
The electronic device according to claim 15 , wherein a distance from the wall surface of the heat insulating container to one end of the output electrode connected to the power generation cell is longer than a distance from the wall surface to the second connecting portion. . 16. The electron according to claim 15 , wherein the fuel cell device has a housing that houses the power generation cell and through which the output electrode penetrates, and the output electrode and the housing are made of the same material. machine. The electronic device according to claim 15 , wherein a solid oxide electrolyte is used for the power generation cell in the fuel cell device.

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