WO2009084230A1 - 燃料電池 - Google Patents
燃料電池 Download PDFInfo
- Publication number
- WO2009084230A1 WO2009084230A1 PCT/JP2008/004019 JP2008004019W WO2009084230A1 WO 2009084230 A1 WO2009084230 A1 WO 2009084230A1 JP 2008004019 W JP2008004019 W JP 2008004019W WO 2009084230 A1 WO2009084230 A1 WO 2009084230A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fuel cell
- joint
- reaction gas
- cell stack
- hole
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
- H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention relates to a fuel cell, and more particularly to a fuel cell provided with a mechanism for preventing flatting.
- a fuel cell generates electricity and heat at the same time by electrochemically reacting a fuel gas containing hydrogen and an oxidant gas such as air containing oxygen. It can be divided into various types depending on the material. One of them is a polymer electrolyte fuel cell using a polymer electrolyte membrane.
- FIG. 11 is an enlarged view of an end portion of a conventional polymer electrolyte fuel cell 51.
- the polymer electrolyte fuel cell 51 includes a cell stack 53 formed by laminating a plurality of unit cells 52 each including a polymer electrolyte membrane, and current collecting plates 54 disposed at both ends of the cell stack 53. And an end plate 55 disposed on the outer side, and these are fixed by being tightened from both sides by bolts.
- a reaction gas supply port 56 for supplying reaction gas (fuel gas and oxidant gas) necessary for power generation is provided on the end face of the fuel cell 51, and this reaction gas is provided.
- An external pipe P for sending reaction gas to the supply port 56 is connected.
- the polymer electrolyte membrane of the polymer electrolyte fuel cell 51 must always be kept moist in order to maintain ion conductivity, and a fuel gas and an oxidant gas that are in contact with the polymer electrolyte membrane.
- a fuel gas and an oxidant gas that are in contact with the polymer electrolyte membrane.
- at least one of these referred to as “reactive gas”
- the reaction gas is humidified to a state close to saturation, if the temperature of the piping in the path is lower than the temperature of the reaction gas, dew condensation occurs in the piping, which inhibits the supply of the reaction gas. As a result, a performance degradation phenomenon called flatting occurs in which the generated voltage decreases.
- FIGS. 12A and 12B are enlarged views of the end surface portion of the fuel cell 61 having the above-described configuration, where FIG. 12A is a cross-sectional view and FIG. 12B is a perspective view.
- the fuel cell 61 includes a joint 63 that connects the cell stack 62 and the external pipe P.
- the current collector plate 64 and the end plate 65 have through-holes 66 and 67 each having a diameter larger than that of the joint 63, and the joint 63 and the end plate 65 are not in contact with each other. According to such a configuration, since the contact between the joint 63 and the end plate 65 is eliminated, it is possible to prevent the occurrence of condensation in the reaction gas path (in the joint 63) due to the contact with the end plate 65.
- the joint 63 of the fuel cell 61 shown in FIG. 12 is difficult to wind a heat insulating material from the viewpoint of work efficiency, the joint 63 comes into contact with outside air entering the gap with the end plate 65 in a wide range. Therefore, in cold regions such as winter, highlands, and high latitudes, the joint 63 is cooled by the outside air, and dew condensation occurs inside the joint 63 (reactive gas path).
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuel cell provided with a reaction gas supply path that hardly causes condensation even near the end plate.
- a fuel cell according to the present invention includes a cell stack having a reaction gas channel inside and a reaction gas supply port for supplying a reaction gas to the reaction gas channel on one end surface.
- a plate having a joint connecting the reaction gas supply port and an external pipe for supplying the reaction gas, and a through hole that is disposed on the one end face of the cell stack and through which the joint passes without contacting the inner wall surface
- a closing structure that substantially closes a space formed between the joint and the inner wall surface of the through hole.
- the end member refers to a member located near the end of the fuel cell, and includes an end plate (including an insulating plate) and a combination of an end plate (including an insulating plate) and a current collector plate.
- a substantially closed space is formed between a joint and a through-hole, the heat transfer from a joint to external air can be suppressed, and the temperature fall of a joint can be prevented. Therefore, according to such a configuration, it is possible to provide a fuel cell including a reaction gas supply path that hardly causes condensation even in the vicinity of the end plate.
- the substantially closed space means a space having a sealing property that prevents convection with the outside air, and does not necessarily mean a space having perfect airtightness.
- the peripheral portion of the through hole of the end member may protrude outward. According to such a configuration, the substantial closed space described above can be formed largely up to the vicinity of the external pipe, and therefore the portion of the joint that contacts the outside air can be further reduced.
- the fuel cell may further include a closing member formed in an annular shape so as to surround the joint inside the through hole, and the closing member may constitute the closing structure.
- the through hole may have a small diameter portion having a smaller inner diameter than the periphery thereof, and the small diameter portion may constitute the closing structure. According to this configuration, the number of parts can be reduced.
- the joint may have a large diameter portion having a larger outer diameter than the periphery thereof, and the large diameter portion may constitute the closing structure. Even in such a configuration, the number of parts can be reduced.
- the base end portion of the joint may have a flat plate shape, and the base end portion may be sandwiched between the cell stack and the end member. According to such a configuration, since heat from the cell stack is easily transmitted to the joint, it is possible to help increase the temperature of the joint or suppress the temperature decrease.
- a gas seal member may be provided between the end member and the joint on the outer side of the substantially closed space.
- FIG. 1 is a schematic diagram of a fuel cell according to Embodiment 1.
- FIG. 1 is an exploded perspective view of a unit cell according to Embodiment 1.
- FIG. 1 is an exploded perspective view of a fuel cell according to Embodiment 1.
- FIG. 3 is an enlarged view around the joint according to the first embodiment.
- FIG. 6 is an enlarged view around a joint according to Embodiment 2.
- FIG. 6 is an enlarged view around a joint according to Embodiment 3.
- FIG. 10 is an enlarged view of a periphery of a joint according to a fourth embodiment.
- FIG. 10 is an enlarged view of the vicinity of a joint according to Embodiment 5.
- FIG. 10 is an enlarged view around a joint according to a sixth embodiment. It is the schematic of the fuel cell which concerns on other embodiment. It is the figure which showed the conventional fuel cell. It is the figure which showed the conventional fuel cell.
- Embodiment 1 of the present invention will be described below with reference to FIGS.
- FIG. 1 is a perspective view of a fuel cell 1 according to Embodiment 1.
- the fuel cell 1 according to Embodiment 1 includes a cell stack 2, a current collector plate 3, an end plate 4, joints 5 to 8, and a closing member 9.
- the cell stack 2 is formed by stacking a plurality of single cells 10. Usually, the cell stack 2 is formed by stacking the unit cells 10 in about 2 to 200 stages according to the required output.
- FIG. 2 is an exploded perspective view of the unit cell 10 according to the first embodiment. Each unit cell includes an MEA (electrode electrolyte membrane assembly) 11, a gas seal 12, and a separator 13.
- MEA electrode electrolyte membrane assembly
- the MEA 11 is obtained by providing a catalyst layer 15 on both sides of a polymer electrolyte membrane 14 and a gas diffusion layer 16 on the outside thereof.
- the polymer electrolyte membrane 14 is made of a cation exchange resin that selectively transports hydrogen ions.
- the catalyst layer 15 is mainly composed of carbon powder supporting a metal having a catalytic function such as platinum.
- the gas diffusion layer 16 has both the gas permeability of the reaction gas (fuel gas and oxidant gas) and the conductivity of electrons.
- the catalyst layer 15 and the gas diffusion layer 16 are collectively referred to as electrodes.
- the gas seal 12 has an annular shape, and is disposed on both outer surfaces of the MEA 11 so as to surround the electrodes (15, 16).
- the gas seal 12 plays a role of preventing the fuel gas and the oxidant gas from leaking out or mixing different gases.
- the separator 13 is disposed outside the gas seal 12 and the electrodes (15, 16), and channels are formed on both sides thereof.
- the flow path 13 a formed on the inner surface is a reaction gas flow path 13 a for supplying a reaction gas (fuel gas or oxidant gas) to the catalyst layer 15.
- the flow path formed on the outer surface is for flowing cooling water between the cells 10.
- the separator 13 has electroconductivity and can mutually connect adjacent MEAs 11 in series.
- Embodiment 1 although it has the structure which removes the heat
- Each flow path formed in the separator 13 has an upstream end connected to the supply manifold hole and a downstream end connected to the discharge manifold hole.
- Manifold holes are provided in the peripheral edge of the MEA 11, and the manifold holes correspond to the manifold holes of the separator 13. Therefore, when each separator 13 and each MEA 11 are assembled in the cell stack 2, the manifold holes of each separator 13 and each MEA 11 are connected to each other to form a manifold (flow path) for each fluid.
- the cell stack 2 according to the first embodiment has two reaction gas supply manifolds, two reaction gas discharge manifolds, one cooling water supply manifold, and one cooling water discharge manifold formed as described above. It is formed to extend in the stacking direction.
- One end of the two reaction gas supply manifolds constitutes two reaction gas supply ports
- two reaction gas discharge manifolds constitute two reaction gas discharge ports
- one end of the cooling water supply manifold serves as a cooling water supply port.
- one end of the cooling water discharge manifold forms a cooling water discharge port.
- FIG. 3 is an exploded perspective view of the fuel cell 1 according to the first embodiment.
- reaction gas fuel gas and oxidant gas
- cooling water is supplied to each flow path. Mouth and outlet to discharge are necessary. Therefore, as shown in FIG. 3, the reaction gas supply port through which the reaction gas is supplied to one end surface of the end surfaces of the cell stack 2 (the outer surface of the separator 13 in the outermost unit cell) as described above. 17, two reaction gas discharge ports 18 through which reaction gas is discharged, one cooling water supply port 19 through which cooling water is supplied, and one cooling water discharge port 20 through which cooling water is discharged. Is formed.
- the reaction gas and cooling water entering from the supply ports 17 and 19 pass through the inside or the boundary of each unit cell 10 and are discharged from the discharge ports 18 and 20.
- the current collector plates 3 are arranged on both outer sides of the cell stack 2 and serve as a connection for improving the electrical contact between the single electrode and the external circuit. As shown in FIG. 3, one of the two current collector plates 3 has a rectangular shape at a position corresponding to each of the supply ports 17 and 19 and the discharge ports 18 and 20 provided in the cell stack 2. Through-holes 21 are formed, and the joints 5 to 8 are inserted through the through-holes 21.
- the end plate 4 is disposed further outside the current collector plate 3 and has a role of holding and fixing the cell stack 2 and the current collector plate 3 from both sides.
- Bolts 22 (screw portions are omitted in FIGS. 1 and 3) are used as fastening means for sandwiching the cell stack 2 and the current collector plate 3.
- the length of the bolt 22 used here is approximately equal to the length of the fuel cell 1 in the unit cell stacking direction.
- the bolt 22 is inserted into the bolt through hole of one end plate 4, passes through the current collector plate 3 and the cell stack 2, passes through the bolt through hole of the other end plate 4, and is positioned outside the nut. (Not shown) and the whole fuel cell 1 is fixed.
- the end plate 4 that must firmly hold the entire fuel cell 1 from both sides is required to have high rigidity, and requires a certain thickness.
- one of the two end plates 4 has a position corresponding to each of the supply ports 17 and 19 and the discharge ports 18 and 20 provided in the cell stack 2.
- a circular through hole 23 is formed, and the joints 5 to 8 are inserted through the through hole 23.
- the end plate 4 is made of, for example, a resin and has an insulating property.
- the end plate 4 is composed of a single member here, but an insulative plate (insulating plate) disposed inside and a strength retaining plate (so-called end plate) disposed outside. Or may have a two-layer structure in which these are integrated.
- the joints 5 to 8 have a role of connecting the supply ports 17 and 19 and the discharge ports 18 and 20 provided in the cell stack 2 to the external pipe P (see FIG. 4). As shown in FIG. 3, the joints 5 to 8 are attached to the supply ports 17 and 19 and the discharge ports 18 and 20, respectively. Of these, dew condensation is a problem in the joint 5 attached to the reaction gas supply port 17. Moreover, as shown in FIG. 3, the joint 5 is mainly comprised from the cell stack connection part 5a, the external piping connection part 5b, and the cylindrical part 5c.
- the cell stack connection portion 5 a is formed at the base end portion of the joint 5 and is connected to the reaction gas supply port 17 formed in the cell stack 2.
- the external pipe connection portion 5b is formed at the tip portion of the joint 5 and can be connected to the external pipe P (see FIG. 4).
- the cylindrical portion 5c is formed at a central portion between the cell stack connecting portion 5a and the external pipe connecting portion 5b, and serves as a reaction gas flow path.
- the joints 5 has been described here, the structures of the joints 6 to 8 are the same as the structure of the joint 5. Further, it is desirable that the materials of the joints 5 to 8 have a low thermal conductivity such as resin. By using a material having a low thermal conductivity, dew condensation caused by an external thermal influence can be suppressed. In the first embodiment, all of the six joints 5 to 8 have the same configuration. However, deformation such as increasing the inner diameter corresponding to the nature and flow rate of the fluid passing through the joints 5 to 8 is different. You may give it.
- the closing member 9 has a flat plate shape and an annular shape. Further, as shown in FIG. 1, the closing member 9 is located in the through hole 23 of the end plate 4 and is attached so as to surround each of the joints 5 to 8 (the joints 5 to 8 are disposed in the inner holes thereof). It is fitted in each of the joints 5 to 8 so as to be inserted).
- the closing member 9 is preferably made of a material having low thermal conductivity such as resin or wood.
- the closing member 9 is attached to all the joints 5 to 8, but the closing member 9 may be attached only to the joint 5 connected to the reaction gas supply port 17.
- the above is the outline of the fuel cell 1 according to Embodiment 1.
- FIG. 4 is an enlarged view of the periphery of the joint 5 connected to the reaction gas supply port 17 among the joints 5 to 8 according to Embodiment 1, wherein (a) is a cross-sectional view and (b) is a cross-sectional view. It is a perspective view.
- the configuration around the joint 5 connected to the reaction gas supply port 17 will be described, but the configuration around the other joints 6 to 8 is the same.
- the cell stack connection portion 5a located at the base end portion of the joint 5 is formed with a male screw, and the end surface of the cell stack 2 (the unit cell 10 located at the extreme end).
- a female thread is formed on the outer surface of the separator.
- the joint 5 is fixed to the end face of the cell stack 2 so as to protrude outward by screwing the male screw of the cell stack connection portion 5 a into the female screw of the cell stack 2.
- the external pipe connection portion 5b located at the tip of the joint 5 is located further outward than the end face of the end plate 4 and can be connected to the external pipe P.
- the external pipe connecting portion 5b has a configuration that can be connected to the external pipe P with one touch.
- other connection mechanisms may be employed.
- the majority part in the longitudinal direction is located inside the through hole 23.
- the outer diameter of the cylindrical portion 5 c is smaller than one side of the through hole 21 of the current collector plate 3 and the inner diameter of the through hole 23 of the end plate 4.
- the inner wall surfaces of the through holes 21 and 23 surround the joint 5 with a gap. Therefore, a gap 24 is formed between the joint 5 and the inner wall surfaces of the through holes 21 and 23 as shown in FIG.
- the closing member 9 is arranged so that the upper surface thereof and the outer surface of the end plate 4 are substantially flush with each other. As a result, the closing member 9 closes the opening of the gap 24 formed between the joint 5 and the through holes 21 and 23, and constitutes a closing structure. With this closed structure, a substantially closed space is generated between the joint 5 and the through holes 21 and 23. In FIG. 4, there is almost no gap between the closing member 9 and the end plate 4, but if a convection between the air in the closed space and the outside air can be prevented, a certain amount of gap is not allowed. Permissible.
- the above is the configuration of the fuel cell according to Embodiment 1.
- the air in the closed space is warmed by the heat transmitted from the cell stack 2, and from the outside.
- the air can be shut off. Therefore, even if it is used in a cold region, the temperature drop of the joint 5 due to the outside air can be prevented, and the dew condensation occurring inside the joint 5 can be suppressed.
- the closing member 9 is disposed between the joint 5 and the end plate 4 without a gap, the joint 5 is supported by the closing member 9, so that the rigidity around the joint 5 is improved.
- the joints 5 to 8 may be connected to the current collector plate 3.
- the current collector plate 3 does not have the above-described through hole 21 and comes into contact with the joints 5 to 8.
- the wall surface of the through hole 23 of the end plate 4 has a gap and surrounds the joints 5 to 8.
- the end plate including the insulating plate
- the “end member” including the end plate (including the insulating plate) and the current collector plate is used.
- the end member has a through hole 23 (21) through which the joint 5 is inserted with a gap.
- FIG. 5 is an enlarged view of the periphery of the joint 5 connected to the reaction gas supply port 17 of the fuel cell according to Embodiment 2, wherein (a) is a cross-sectional view and (b) is a perspective view.
- FIG. 5 is a diagram corresponding to FIG. 4 referred to in the description of the first embodiment.
- the fuel cell 1A according to the second embodiment has substantially the same configuration as the fuel cell 1 according to the first embodiment.
- the end face of the end plate 4 is used in the fuel cell according to the second embodiment.
- the configuration differs from the fuel cell 1 according to Embodiment 1 in that the peripheral portion 25 of the through hole 23 projects outward (toward the distal end of the joint 5).
- the substantial closed space generated between the joint 5 and the through hole 23 of the end plate 4 can be further increased. Therefore, this closed space accommodates the joint 5 over a wider range in the longitudinal direction, and the range in which condensation can occur can be reduced.
- the peripheral portion 25 of the through hole 23 of the end plate 4 protrudes outward to the extent that the connection between the joint 5 and the external pipe P is not hindered.
- it is effective for the joint 5 having a high height.
- FIG. 6 is an enlarged view of the periphery of the joint 5 connected to the reaction gas supply port 17 of the fuel cell 1B according to Embodiment 2, wherein (a) is a cross-sectional view and (b) is a perspective view.
- the configuration around the joint 5 connected to the reaction gas supply port 17 will be described, but the configuration around the other joints 6 to 8 is the same.
- the fuel cell 1B according to the third embodiment is substantially the same as the configuration of the fuel cell 1A according to the second embodiment, but the fuel cell 1A according to the second embodiment includes a closing member 9.
- the fuel cell 1B according to Embodiment 3 does not include the closing member 9, and instead, the through-hole 23 of the end plate 4 has a small-diameter portion 26 having an inner diameter smaller than the periphery thereof.
- the configuration is different from the fuel cell 1A according to the second embodiment.
- the fuel cell 1B according to the third embodiment differs from the configuration of the fuel cell 1A according to the second embodiment in that the opening portion of the through hole 23 of the end plate 4 protrudes radially inward.
- the small diameter portion 26 can serve as a closing structure, so that the closing member 9 is not necessary. That is, the number of parts and work processes of the fuel cell 1B can be reduced.
- FIG. 7 is an enlarged view of the periphery of the joint 5 connected to the reaction gas supply port 17 of the fuel cell 1C according to Embodiment 4, where (a) is a cross-sectional view and (b) is a perspective view.
- the configuration around the joint 5 connected to the reaction gas supply port 17 will be described, but the configuration around the other joints 6 to 8 is the same.
- the fuel cell 1C according to the fourth embodiment is substantially the same as the configuration of the fuel cell 1A according to the second embodiment, but the fuel cell 1A according to the second embodiment includes a closing member 9.
- the fuel cell 1C according to the fourth embodiment does not include the closing member 9, and instead of this, the joint 5 has a large-diameter portion 27 having an outer diameter larger than its periphery.
- the configuration is different from that of the fuel cell 1A according to the second embodiment.
- the fuel cell 1C according to the fourth embodiment has a fuel cell according to the second embodiment in that a portion of the joint 5 located at the opening portion of the through hole 23 of the end plate 4 protrudes radially outward.
- the large diameter portion 27 can serve as a closing structure, so that the closing member 9 is not necessary. That is, as in the case of the fuel cell 1B according to the third embodiment, the number of parts and the work process of the fuel cell 1C can be reduced.
- FIG. 8 is an enlarged view of the periphery of the joint 5 connected to the reaction gas supply port 17 of the fuel cell 1D according to Embodiment 5, wherein (a) is a cross-sectional view and (b) is a perspective view.
- the configuration around the joint 5 connected to the reaction gas supply port 17 will be described, but the configuration around the other joints 6 to 8 is the same.
- the fuel cell 1D according to the fifth embodiment has substantially the same configuration as the fuel cell 1C according to the fourth embodiment, but the fuel cell 1C according to the fourth embodiment has a cell stack connection portion.
- (Base end portion) 5a has a male screw shape, and this male screw is screwed into the cell stack 2, whereas in the fuel cell 1C according to the fifth embodiment, the cell stack connection portion 5a is formed on the end surface of the cell stack 2.
- the configuration is different from the fuel cell 1C according to the fourth embodiment in that it has a flat plate shape extending along the cell stack and the cell stack connection portion 5a is sandwiched between the cell stack 2 and the end plate 4. .
- the through hole 21 of the current collector plate 3 is formed to have a size capable of accommodating the cell stack connection portion 5 a of the joint 5, and the extended portion 28 is formed at the base end portion of the through hole 23 of the end plate 4. Is formed. And the part which protruded from the through-hole 21 of the current collection board 3 of the cell stack connection part 5a of the coupling 5 is accommodated in this expansion part 28.
- the cell stack connection portion 5 a is accommodated in the extension portion 28 such that its main surface is pressed against the wall surface 29 of the end plate 4 constituting the stepped surface of the extension portion 28.
- a seal member (not shown) is appropriately disposed between the cell stack connecting portion 5a of the joint 5 and the cell stack 2, the current collecting plate 3, and the end plate 4 that are in contact with the surface.
- the fuel cell 1D since the area of the joint 5 that contacts the cell stack 2 is increased, heat from the cell stack 2 is easily transmitted, and the occurrence of condensation is more effectively suppressed. be able to.
- the cell stack connection portion 5 a of the joint 5 is directly sandwiched between the end plate 4 and the cell stack 2, but may be sandwiched via the current collector plate 3. That is, the cell stack connection portion 5 a may be directly sandwiched between the end plate 4 and the current collector plate 3, or may be directly sandwiched between the current collector plate 3 and the cell stack 2.
- the cell stack connection portion 5a is held between the cell stack 2 and the end member in any of the above cases. It will be.
- FIG. 9 is an enlarged view around the joint 5 connected to the reaction gas supply port 17 of the fuel cell 1E according to Embodiment 6, wherein (a) is a cross-sectional view and (b) is a partially broken perspective view. It is.
- the configuration around the joint 5 connected to the reaction gas supply port 17 will be described, but the configuration around the other joints 6 to 8 is the same.
- the fuel cell 1E according to the sixth embodiment is substantially the same as the configuration of the fuel cell 1D according to the fifth embodiment, but the large-diameter portion 27 of the fuel cell 1D according to the fifth embodiment is the same.
- the fuel cell according to the sixth embodiment is in direct contact with the end plate 4
- the fuel cell according to the fifth embodiment is provided with a gas seal material 71 between the large diameter portion 27 and the end plate 4. The configuration is different from 1D.
- the gas seal material 71 can completely block the air in the gap 24 from the outside air, and the heat insulation performance can be further improved. Further, when vibration is applied to the fuel cell 1E, the gas seal material 71 serves as a buffer material, so that the vibration resistance can be further improved.
- a material of the gas sealing material 71 of Embodiment 6 what is necessary is just a material provided with elasticity and gas barrier property, such as fluororubber, EPDM, and silicon rubber.
- the first to sixth embodiments according to the present invention have been described with reference to the drawings.
- the specific configuration is not limited to these examples, and the design can be changed without departing from the gist of the present invention. And the like are included in the present invention.
- the fastening means as shown in FIG.
- the cell stack 2 can also be fastened using the fastening band 30 having a small thickness.
- the fastening band 30 does not protrude greatly from the surface of the end plate 4, so that the size of the fuel cell 1F can be reduced.
- a material excellent in tensile strength and rust resistance such as resin (engineering plastic, elastomer, etc.), stainless steel (SUS304, etc.) or chromium molybdenum steel is used.
- the fuel cell of the present invention is useful as a fuel cell or the like having a reaction gas supply path that hardly causes condensation even near the end plate.
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Abstract
Description
2 セルスタック
3 集電板
4 端板
5~8 継手
5a セルスタック接続部
5b 外部配管接続部
9 閉塞部材
13a 反応ガス流路
17 反応ガス供給口
23 貫通孔
24 間隙(空間)
25 外環部分
26 小径部
27 大径部
P 外部配管
本発明の実施の形態1を、図1~4を参照しつつ以下に説明する。
次に、図5を参照して、実施の形態2に係る燃料電池1Aについて説明する。実施の形態2に係る燃料電池1Aは、継手周辺を除いて実施の形態1に係る燃料電池1と同じ構成を有しているため、継手周辺以外の構成についての説明は省略する。なお、後述する実施の形態3~5についても同様の理由から継手周辺以外の構成についての説明は省略する。図5は、実施の形態2に係る燃料電池の反応ガス供給口17に接続する継手5周辺の拡大図であって、(a)は断面図であり、(b)斜視図である。ここでは、反応ガス供給口17に接続する継手5の周辺の構成を説明するが、他の継手6~8の周辺も構成は同じである。図5は、実施の形態1の説明で参照した図4に対応する図である。
次に、図6を参照して、実施の形態3に係る燃料電池について説明する。図6は、実施の形態2に係る燃料電池1Bの反応ガス供給口17に接続する継手5周辺の拡大図であって、(a)は断面図であり、(b)斜視図である。ここでは、反応ガス供給口17に接続する継手5の周辺の構成を説明するが、他の継手6~8の周辺も構成は同じである。図6に示すように、実施の形態3に係る燃料電池1Bは実施の形態2に係る燃料電池1Aの構成とほぼ同じであるが、実施の形態2に係る燃料電池1Aが閉塞部材9を備えているのに対し、実施の形態3に係る燃料電池1Bは閉塞部材9を備えておらず、これに代えて端板4の貫通孔23がその周辺よりも内径が小さい小径部26を有している点で実施の形態2に係る燃料電池1Aと構成が異なる。換言すれば、実施の形態3に係る燃料電池1Bは、端板4の貫通孔23の開口部分が半径方向内側に突出している点で実施の形態2に係る燃料電池1Aの構成と異なる。実施の形態3に係る燃料電池1Bの構成によれば、小径部26が閉塞構造としての役割を果たすことができるため、閉塞部材9が不要となる。つまり、燃料電池1Bの部品点数及び作業工程を減らすことができる。
次に、図7を参照して、実施の形態4に係る燃料電池1Cについて説明する。図7は、実施の形態4に係る燃料電池1Cの反応ガス供給口17に接続する継手5周辺の拡大図であって、(a)は断面図であり、(b)斜視図である。ここでは、反応ガス供給口17に接続する継手5の周辺の構成を説明するが、他の継手6~8の周辺も構成は同じである。図7に示すように、実施の形態4に係る燃料電池1Cは実施の形態2に係る燃料電池1Aの構成とほぼ同じであるが、実施の形態2に係る燃料電池1Aが閉塞部材9を備えているのに対し、実施の形態4に係る燃料電池1Cは閉塞部材9を備えておらず、これに代えて継手5がその周辺よりも外径が大きい大径部27を有している点で実施の形態2に係る燃料電池1Aと構成が異なる。換言すれば、実施の形態4に係る燃料電池1Cは、継手5のうち端板4の貫通孔23の開口部分に位置する部分が半径方向外側に突出している点で実施の形態2に係る燃料電池1Aの構成と異なる。実施の形態4に係る燃料電池1Cの構成によれば、大径部27が閉塞構造としての役割を果たすことができるため、閉塞部材9が不要となる。つまり、実施の形態3に係る燃料電池1Bの場合と同様、燃料電池1Cの部品点数及び作業工程を減らすことができる。
次に、図8を参照して、実施の形態5に係る燃料電池1Dについて説明する。図8は、実施の形態5に係る燃料電池1Dの反応ガス供給口17に接続する継手5周辺の拡大図であって、(a)は断面図であり、(b)斜視図である。ここでは、反応ガス供給口17に接続する継手5の周辺の構成を説明するが、他の継手6~8の周辺も構成は同じである。図8に示すように、実施の形態5に係る燃料電池1Dは、実施の形態4に係る燃料電池1Cと構成がほぼ同じであるが、実施の形態4に係る燃料電池1Cはセルスタック接続部(基端部分)5aが雄ねじ状になっており、この雄ねじをセルスタック2にねじ込んでいるのに対し、実施の形態5に係る燃料電池1Cはセルスタック接続部5aがセルスタック2の端面に沿って広がる平板状の形状を有しており、セルスタック接続部5aがセルスタック2と端板4との間で狭持されている点で実施の形態4に係る燃料電池1Cと構成が異なる。
次に、図9を参照して、実施の形態6に係る燃料電池1Eについて説明する。図9は、実施の形態6に係る燃料電池1Eの反応ガス供給口17に接続する継手5周辺の拡大図であって、(a)は断面図であり、(b)は一部破断斜視図である。ここでは、反応ガス供給口17に接続する継手5の周辺の構成を説明するが、他の継手6~8の周辺も構成は同じである。図9に示すように、実施の形態6に係る燃料電池1Eは実施の形態5に係る燃料電池1Dの構成とほぼ同じであるが、実施の形態5に係る燃料電池1Dの大径部27が直接端板4に接しているのに対し、実施の形態6に係る燃料電池1Eは大径部27と端板4の間にガスシール材71を設ける点で、実施の形態5に係る燃料電池1Dと構成が異なる。
Claims (7)
- 反応ガス流路を内部に有するとともに前記反応ガス流路に反応ガスを供給するための反応ガス供給口を一方の端面に有するセルスタックと、前記反応ガス供給口と反応ガス供給用の外部配管とをつなぐ継手と、前記セルスタックの前記一方の端面に配置されるとともに、前記継手が内壁面に接することなく挿通する貫通孔を有する板状の端部材と、前記継手と前記貫通孔の内壁面との間に形成された空間を実質的に閉塞する閉塞構造と、を備えた燃料電池。
- 前記端部材の前記貫通孔の周囲部分が外方に突出している、請求項1に記載の燃料電池。
- 前記貫通孔の内側において前記継手を取り巻くようにして環状に形成された閉塞部材を備え、該閉塞部材が前記閉塞構造を構成している請求項1又は2に記載の燃料電池。
- 前記貫通孔はその周辺に比べ内径が小さい小径部を有し、該小径部が前記閉塞構造を構成している請求項1又は2に記載の燃料電池。
- 前記継手はその周辺に比べ外径が大きい大径部を有し、該大径部が前記閉塞構造を構成している請求項1又は2に記載の燃料電池。
- 前記継手の基端部分は平板状の形状を有しており、該基端部分は前記セルスタックと前記端部材とで狭持されている請求項1乃至5のうちいずれか一の項に記載の燃料電池。
- 前記実質的に閉塞される空間の外方側において、前記端部材と前記継手との間にガスシール部材が設けられている請求項1乃至6のうちいずれか一の項に記載の燃料電池。
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CN2008800065278A CN101622747B (zh) | 2007-12-28 | 2008-12-26 | 燃料电池 |
US12/598,515 US8435692B2 (en) | 2007-12-28 | 2008-12-26 | Fuel cell |
EP08868205.9A EP2226877B1 (en) | 2007-12-28 | 2008-12-26 | Fuel cell |
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CN101971405B (zh) * | 2009-03-27 | 2013-10-09 | 松下电器产业株式会社 | 固体高分子型燃料电池组 |
US9136552B2 (en) * | 2010-06-07 | 2015-09-15 | Sumitomo Electric Industries, Ltd. | Gas decomposition component, ammonia decomposition component, power generation apparatus, electrochemical reaction apparatus, and method for producing gas decomposition component |
KR20130050030A (ko) * | 2011-11-07 | 2013-05-15 | 삼성에스디아이 주식회사 | 연료전지 모듈 및 그 제조 방법 |
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US8435692B2 (en) | 2013-05-07 |
CN101622747B (zh) | 2012-07-25 |
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JP4451926B2 (ja) | 2010-04-14 |
EP2226877B1 (en) | 2016-07-27 |
EP2226877A4 (en) | 2013-05-15 |
EP2226877A1 (en) | 2010-09-08 |
CN101622747A (zh) | 2010-01-06 |
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