JP4621488B2 - Fuel cell - Google Patents

Description

The present invention, electrolyte electrode assembly constituted by sandwiching an electrolyte between the anode electrode and the cathode electrode, relates to fuel cells disposed between a pair of separators consisting of plates of one respectively.

  In general, a solid oxide fuel cell (SOFC) uses an oxide ion conductor, for example, stabilized zirconia, as an electrolyte, and an electrolyte / electrode assembly in which an anode electrode and a cathode electrode are disposed on both sides of the electrolyte ( A single cell) is sandwiched between separators (bipolar plates). This fuel cell is usually used as a fuel cell stack in which a predetermined number of single cells and separators are stacked.

In the above fuel cell, when an oxidant gas, for example, a gas containing mainly oxygen or air (hereinafter also referred to as oxygen-containing gas) is supplied to the cathode electrode, this oxidation is performed at the interface between the cathode electrode and the electrolyte. Oxygen in the agent gas is ionized, and oxide ions (O ²⁻ ) move to the anode electrode side through the electrolyte. Since the anode electrode is supplied with a fuel gas, for example, a gas mainly containing hydrogen (hereinafter also referred to as a hydrogen-containing gas) or CO, in this anode electrode, oxide ions and hydrogen (or CO) Reacts to produce water (or CO ₂ ). Electrons generated during that time are taken out to an external circuit and used as direct current electric energy.

  In this type of fuel cell, various proposals have been made for the purpose of reducing the thickness of the separator and reducing the number of components in order to reduce the dimension in the stacking direction. For example, as shown in FIG. 16, a fuel cell separator 1 disclosed in Patent Document 1 includes a thin sheet-like separator body 2 and a number of first fine bodies integrally formed on one side of the separator body 2. The projection 3 has a large number of second fine projections 4 integrally formed on the other surface of the separator body 2. A fuel gas passage 6 is formed between the separator 1 and the fuel electrode 5 via the first fine protrusion 3, while a second fine protrusion 4 is formed between the separator 1 and the air electrode 7. An oxidant gas passage 8 is formed through the.

Japanese Patent Laying-Open No. 2002-75408 (FIG. 2)

  However, in the above-mentioned Patent Document 1, only the fuel gas passage 6 and the oxidant gas passage 8 are formed on both surfaces of one separator 1, and the supply form of the fuel gas and the oxidant gas is limited. End up. That is, the fuel gas and the oxidant gas are only supplied from one end portion of the fuel electrode 5 and the air electrode 7 toward the other end portion. For this reason, versatility is reduced, and depending on the shape of the fuel electrode 5 and the air electrode 7, the fuel gas and the oxidant gas may not be uniformly supplied to the entire surface of each electrode.

  In addition, the sealing performance of the fuel gas and the oxidizing gas must be maintained well, and there is a problem that the sealing structure becomes complicated.

The present invention solves this type of problem, and it is a simple and compact structure that can reliably maintain a desired sealing property while reducing the thickness in the stacking direction and can efficiently generate power. an object of the present invention is to provide the batteries.

  The present invention is a fuel cell in which an electrolyte / electrode assembly formed by sandwiching an electrolyte between an anode electrode and a cathode electrode is disposed between a pair of separators each formed of a single plate.

  The fuel cell is provided on one surface of the separator, provided on the other surface of the separator with a first protrusion that forms a fuel gas passage for supplying fuel gas along the electrode surface of the anode electrode, A second protrusion that forms an oxidant gas passage for supplying an oxidant gas along the electrode surface of the cathode electrode, and one surface or the other surface of the separator, and communicates with the fuel gas supply unit. A passage member that forms a fuel gas supply passage; and a fuel gas passage that is provided apart from a center side of the electrolyte / electrode assembly in a direction close to the fuel gas supply portion and communicates with the fuel gas supply passage And a fuel gas inlet for introducing fuel gas.

  Also, an exhaust gas passage for discharging the reaction gas after being used in the reaction in the electrolyte / electrode assembly as exhaust gas in the stacking direction of the electrolyte / electrode assembly and the separator, and the oxidant gas before use as an oxidant gas An oxidant gas supply unit that flows in the stacking direction to supply the passage, and a fuel gas supply unit that supplies fuel gas before use in the stacking direction is provided in the oxidant gas supply unit in an airtight manner. In addition, the fuel gas supply passage is preferably disposed across the separator surface direction that communicates the fuel gas passage and the fuel gas supply portion and intersects the oxidant gas supply portion in the stacking direction.

  Furthermore, the exhaust gas passage is preferably provided at the outer peripheral end portion of the separator, and the fuel gas supply portion is preferably provided in an airtight manner at the central portion of the separator.

  In addition, the fuel gas inlet is preferably set at a position eccentric to the upstream side in the flow direction of the oxidant gas with respect to the center of the electrolyte / electrode assembly. It is preferable to supply the oxidant gas to the oxidant gas passage from the inner peripheral surface of the electrolyte / electrode assembly.

  Furthermore, it is preferable that the first protrusion has an annular protrusion, and the second protrusion is formed inside the annular protrusion, and the electrolyte / electrode assembly is formed with respect to the central portion of the separator. It is preferable that a plurality are arranged on concentric circles.

  According to the present invention, the separator comprising a single plate is provided, and the separator is provided with a passage member for forming a fuel gas supply passage. Therefore, the dimensions (thicknesses) of the separator in the stacking direction are simplified. ) Is effectively shortened. In addition, by providing the passage member, the electrolyte / electrode assembly can be disposed in the oxidant gas atmosphere, so that the seal of the oxidant gas becomes unnecessary and the sealing material can be reduced. For this reason, a seal structure can be simplified effectively and manufacturing cost can be reduced.

  Furthermore, since the fuel gas introduction port is separated from the center side of the electrolyte / electrode assembly in the direction close to the fuel gas supply part, the fuel gas supply passage is shortened satisfactorily. Therefore, the seal area of the fuel gas supply passage is reduced, and it is possible to effectively reduce the leakage of the fuel gas, and the pressure loss in the fuel gas supply passage is reduced.

  In addition, the number of first and second protrusions provided in the separator can be increased. Thereby, the current collection efficiency is improved, and the rigidity of the separator itself is increased, so that the load in the stacking direction can be transmitted more uniformly.

  FIG. 1 is a schematic perspective explanatory view of a fuel cell stack 12 in which a plurality of fuel cells 10 according to the first embodiment of the present invention are stacked in the direction of arrow A. FIG.

  The fuel cell 10 is a solid oxide fuel cell, and is used for various applications such as in-vehicle use in addition to installation. As shown in FIGS. 2 and 3, the fuel cell 10 is provided with a cathode electrode 22 and an anode electrode 24 on both surfaces of an electrolyte (electrolyte plate) 20 made of an oxide ion conductor such as stabilized zirconia, for example. The electrolyte / electrode assembly 26 is provided. The electrolyte / electrode assembly 26 is formed in a disk shape, and a barrier layer (not shown) is provided at the inner peripheral end portion to prevent the oxidant gas from entering.

  The fuel cell 10 is configured by sandwiching a plurality of, for example, eight electrolyte / electrode assemblies 26 between a pair of separators 28. Between the separators 28, eight electrolyte / electrode assemblies 26 are arranged concentrically with the fuel gas supply communication hole (fuel gas supply part) 30 which is the central part of the separator 28.

  As shown in FIG. 2, the separator 28 is composed of, for example, a single metal plate or a carbon plate composed of a sheet metal such as a stainless alloy. The separator 28 has a first small-diameter end portion 32 that forms a fuel gas supply communication hole 30 at the center. A relatively large-diameter disk portion 36 is integrally provided via a plurality of first bridge portions 34 that are radially spaced apart from the first small-diameter end portion 32 at equal angular intervals. The disc portion 36 is set to have substantially the same dimensions as the electrolyte / electrode assembly 26. As shown in FIGS. 2, 4, and 5, the adjacent disk portions 36 are separated from each other through the slits 38.

  A first protrusion 48 that forms a fuel gas passage 46 for supplying fuel gas along the electrode surface of the anode electrode 24 is provided on the surface 36 a of each disk portion 36 that contacts the anode electrode 24 ( (See FIG. 4). A second protrusion 52 that forms an oxidant gas passage 50 for supplying an oxidant gas along the electrode surface of the cathode electrode 22 is provided on the surface 36 b of each disk portion 36 that contacts the cathode electrode 22. (See FIG. 5). As shown in FIG. 6, the first protrusion 48 and the second protrusion 52 protrude so as to extend in directions opposite to each other.

  The first protrusion 48 forms a ring-shaped protrusion, and the second protrusion 52 forms a mountain-shaped protrusion. The second protrusion 52, which is a mountain-shaped protrusion, is disposed so as to be surrounded by the first protrusion 48, which is a ring-shaped protrusion. On the surface from which the second protrusion 52 protrudes, a recessed portion 53 that is depressed corresponding to the protrusion of the first protrusion 48 is formed, and the second protrusion 52 is disposed in the recess 53. ing.

  In other words, the center axis L1 of the first protrusion 48 that is a ring shape of a perfect circle and the center axis L2 of the second protrusion 52 are matched, in other words, the first and second protrusions 48, 52. They are arranged so that their centers coincide and are coaxial with each other.

  As shown in FIGS. 7 and 8, a plurality of first and second protrusions 48 and 52 are formed, and a height H1 of the first protrusion 48 and a height H2 of the second protrusion 52 are shown. Is set to a relationship of H1 <H2. This is because the volume of the oxidant gas passage 50 is made larger than the volume of the fuel gas passage 46. The first and second projecting portions 48 and 52 having the above-described shapes are shown as examples of molding by press molding. However, as other molding examples, for example, they may be provided by etching molding, molding by cutting, or the like. it can.

  In addition, while the 1st projection part 48 is comprised with a mountain-shaped protrusion, the 2nd projection part 52 may be comprised with a ring-shaped protrusion. In that case, it is preferable to set the height of the ring-shaped protrusion to be larger than the height of the mountain-shaped protrusion.

  As shown in FIGS. 2 to 5, the disk portion 36 is formed with a fuel gas inlet 54 for supplying fuel gas to the fuel gas passage 46. The position of the fuel gas inlet 54 is determined by the pressure of the fuel gas and the oxidant gas. For example, the fuel gas inlet 54 is eccentric to the upstream side of the oxidant gas flow direction (arrow B direction) with respect to the center of the disk portion 36. Is set.

  A passage member 56 is fixed to the surface of the separator 28 facing the cathode electrode 22 by, for example, brazing or laser welding. As shown in FIGS. 2 and 9, the passage member 56 includes a second small-diameter end 58 that forms the fuel gas supply communication hole 30 at the center. Eight second bridge portions 60 extend radially from the second small-diameter end portion 58, and each second bridge portion 60 extends from the first bridge portion 34 of the separator 28 to the fuel gas introduction port of the disc portion 36. It is fixed to 54.

  On the joint surface of the passage member 56, a plurality of slits 62 are formed radially at the second small diameter end portion 58 so as to communicate with the fuel gas supply communication hole 30. The slit 62 communicates with a concave portion 64 that circulates around the second small diameter end portion 58 to prevent the flow of the brazing material and to make the flow of the fuel gas uniform. A fuel gas supply passage 66 communicating with the fuel gas passage 46 from the fuel gas supply communication hole 30 through the slit 62 and the recess 64 is formed between the first and second bridge portions 34 and 60. As shown in FIG. 10, each passage member 56 is configured to have a curved cross section so that the second bridge portion 60 can be elastically deformed in the stacking direction with respect to a load in the stacking direction (arrow A direction).

  As shown in FIGS. 7 and 8, the oxidant gas passage 50 allows the oxidant gas to flow in the direction of arrow A from between the inner peripheral end of the electrolyte / electrode assembly 26 and the inner peripheral end of the disc portion 36. It communicates with the oxidant gas supply unit 67 to be supplied. The oxidant gas supply part 67 is located between the inner side of each disk part 36 and the first bridge part 34 and extends in the stacking direction.

  As shown in FIG. 7, an insulating seal 69 for sealing the fuel gas supply communication hole 30 is provided between the separators 28. The insulating seal 69 is made of, for example, mica material or ceramic material. In the fuel cell 10, an exhaust gas passage 68 is formed outside the disk portion 36.

  As shown in FIG. 1, the fuel cell stack 12 includes disk-shaped end plates 70 a and 70 b at both ends in the stacking direction of the plurality of fuel cells 10. The end plate 70 a has a fuel gas supply port 76 formed at the center thereof, and the fuel gas supply port 76 communicates with the fuel gas supply communication hole 30 of each fuel cell 10. In the end plate 70a, two bolt insertion ports 78a are formed with the fuel gas supply port 76 interposed therebetween. Each bolt insertion port 78 a corresponds to the oxidant gas supply unit 67 of the fuel cell stack 12.

  Eight circular openings 80 are formed in the end plate 70 a along a virtual circle centered on the fuel gas supply port 76, that is, corresponding to each electrolyte / electrode assembly 26. Each circular opening 80 communicates with a rectangular opening 82 projecting toward the fuel gas supply port 76, and a part of the rectangular opening 82 overlaps the oxidant gas supply part 67. Oxidant gas is supplied from the part 82.

  The end plate 70b is made of a conductive member. Two fastening bolts 86 are inserted into the center portion of the end plate 70b, and the fastening bolts 86 are insulated from the end plate 70b. When a nut 88 is screwed to the tip of the tightening bolt 86, a desired tightening load is applied between the end plates 70a and 70b.

  The operation of the fuel cell stack 12 configured as described above will be described below.

  When assembling the fuel cell 10, first, as shown in FIG. 2, the passage member 56 is joined to the surface of the separator 28 facing the cathode electrode 22. For this reason, a fuel gas supply passage 66 communicating with the fuel gas supply communication hole 30 is formed between the separator 28 and the passage member 56, and the fuel gas supply passage 66 is connected to the fuel gas introduction port 54 from the fuel gas introduction port 54. It communicates with the passage 46 (see FIG. 7). The separator 28 is provided with a ring-shaped insulating seal 69 around the fuel gas supply communication hole 30.

  Thus, a separator 28 is formed, and eight electrolyte / electrode assemblies 26 are sandwiched between the separators 28 to obtain the fuel cell 10. As shown in FIGS. 2 and 3, each separator 28 has an electrolyte / electrode assembly 26 disposed between the surfaces 36 a and 36 b facing each other, and the fuel gas supply communication hole 30 side from the center of each anode electrode 24. The fuel gas inlet 54 is disposed at a position eccentric to the center.

  A plurality of the fuel cells 10 are stacked in the direction of arrow A, and end plates 70a and 70b are disposed at both ends in the stacking direction. As shown in FIG. 1, a fastening bolt 86 is inserted into each of the bolt insertion openings 78 a and 78 b of the end plates 70 a and 70 b, and a nut 88 is screwed onto the tip of the fastening bolt 86. Thus, the fuel cell stack 12 is configured.

  Therefore, the fuel cell stack 12 is supplied with a fuel gas (for example, a hydrogen-containing gas) and an oxygen-containing gas (hereinafter also referred to as air) that is an oxidant gas. The fuel gas is supplied to the fuel gas supply communication hole 30 of the fuel cell stack 12 and moves in the stacking direction (arrow A direction) while passing through the slit 62 in the separator 28 constituting each fuel cell 10. 66 (see FIG. 7).

  The fuel gas moves between the first and second bridge portions 34 and 60 along the fuel gas supply passage 66 and is introduced into the fuel gas passage 46 from the fuel gas inlet 54 formed in the disc portion 36. The fuel gas inlet 54 is set at a position eccentric from the center position of the anode electrode 24 of each electrolyte / electrode assembly 26 to the upstream side in the flow direction of the oxidant gas (in the direction of arrow B). Therefore, the fuel gas is supplied from the fuel gas inlet 54 to the anode electrode 24 and moves along the fuel gas passage 46 toward the outer periphery of the anode electrode 24 (see FIG. 8).

  On the other hand, the oxidant gas supplied to the oxidant gas supply unit 67 provided on the center side of each fuel cell 10 is the inner peripheral end of the electrolyte / electrode assembly 26 and the inner peripheral end of the disc part 36. Flows in the direction of arrow B from between the two and is sent to the oxidant gas passage 50. As shown in FIGS. 7 and 8, in the oxidant gas passage 50, the outer peripheral end portion (outside of the separator 28) from the inner peripheral end portion (center portion of the separator 28) side of the cathode electrode 22 of the electrolyte / electrode assembly 26. The oxidant gas flows toward the peripheral end side.

  Accordingly, in the electrolyte / electrode assembly 26, the fuel gas is supplied from the center side of the electrode surface of the anode electrode 24 toward the peripheral end side, and in one direction (arrow B direction) of the electrode surface of the cathode electrode 22. The oxidant gas is supplied toward the head (see FIGS. 8 and 10). At that time, oxide ions move to the anode electrode 24 through the electrolyte 20, and power is generated by a chemical reaction.

  In this case, in the first embodiment, the separator 28 is composed of a single plate, and the both surfaces 36 a and 36 b of each disk portion 36 of the separator 28 are respectively in contact with the anode electrode 24 and the cathode electrode 22. First and second protrusions 48 and 52 are provided. A passage member 56 is fixed to the separator 28, and a fuel gas supply passage 66 communicating with the fuel gas passage 46 from the fuel gas supply communication hole 30 through the fuel gas inlet 54 is formed by the passage member 56. ing.

  Therefore, the oxidant gas is supplied in one direction (in the direction of arrow B) from the inside of the fuel cell 10 toward the outer peripheral portion, while the fuel gas is allowed to flow from the center side of the anode electrode 24 toward the outer peripheral end portion side. it can. Accordingly, the separator 28 is not only effectively shortened in the dimension (thickness) in the stacking direction, but can be supplied while uniformly distributing the fuel gas to the entire electrode surface of the anode electrode 24. As a result, while the separator 28 has a compact configuration, the power generation reaction of the electrolyte / electrode assembly 26 is performed uniformly over the entire power generation surface, and an effect that stable power generation is performed is obtained.

  In addition, since the fuel gas supply passage 66 is hermetically formed by the passage member 56, each electrolyte / electrode assembly 26 can be disposed in an oxidant gas atmosphere, and a seal material is disposed in the oxidant gas supply portion 67. There is no need to do. For this reason, there is an advantage that the sealing member can be effectively reduced by simplifying the sealing structure, and the manufacturing cost can be easily reduced.

  Furthermore, in the first embodiment, the fuel gas inlet 54 can be set at a position eccentric to the upstream side in the oxidant gas flow direction (center side of the fuel cell 10) with respect to the center of the disc portion 36. Since the pressure of the oxidant gas passage 50 is lower on the exhaust gas passage 68 side than on the oxidant gas supply portion 67 side, the fuel gas tends to be swept out of the separator 28 due to the influence of the pressure of the oxidant gas and drift. is there. Therefore, by setting the position of the fuel gas inlet 54, the fuel gas can be supplied uniformly over the entire surface of the anode electrode 24, and the power generation reaction can be easily promoted.

  In each disk part 36, the height H <b> 1 of the first protrusion 48 is set lower than the height H <b> 2 of the second protrusion 52. This is because the fuel gas volume flow rate of the fuel gas passage 46 formed by the first protrusion 48 is smaller than the oxidant gas volume flow rate of the oxidant gas passage 50 formed by the second protrusion 52. The heights H1 and H2 of the first and second protrusions 48 and 52 can be variously changed depending on the supply pressure of the fuel gas and the oxidant gas.

  Furthermore, in the first embodiment, since the fuel gas inlet 54 is separated from the center side of the electrolyte / electrode assembly 26 in the direction approaching the fuel gas supply communication hole 30, the fuel gas supply passage 66 is excellent. The length is shortened (see FIG. 9). Therefore, there is an advantage that the sealing area of the fuel gas supply passage 66 can be reduced and the leakage of the fuel gas can be reduced, and the pressure loss in the fuel gas supply passage 66 is reduced.

  Moreover, since the fuel gas supply passage 66 is shortened, the number of first and second protrusions 48 and 52 provided in the separator 28 can be increased (see FIGS. 4 and 5). Thereby, the current collection efficiency is improved and the rigidity of the separator 28 is increased, so that the load in the stacking direction can be transmitted more uniformly.

  FIG. 11 is an exploded perspective view of a fuel cell 120 according to the second embodiment of the present invention, FIG. 12 is a cross-sectional view of a fuel cell stack 122 in which a plurality of the fuel cells 120 are stacked, and FIG. FIG. 3 is a schematic cross-sectional explanatory view for explaining the operation of the fuel cell 120. Note that the same components as those of the fuel cell 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In each separator 28 constituting the fuel cell 120, a passage member 124 is fixed to the surface facing the anode electrode 24. The passage member 124 includes a second bridge portion 126 fixed to the first bridge portion 34 of the separator 28, and a fuel gas supply passage 66 is formed between the first and second bridge portions 34 and 126. The tip of each second bridge portion 126 terminates at a position that is eccentric from the center of the anode electrode 24 of the electrolyte / electrode assembly 26 toward the fuel gas supply communication hole 30 side. A plurality of fuel gas inlets 128 opening toward the bottom are formed. The disk portion 36 of each separator 28 is not provided with the fuel gas inlet 54 of the first embodiment.

  In the second embodiment configured as described above, the fuel gas supplied to the fuel gas supply communication hole 30 moves along the fuel gas supply passage 66 formed between each separator 28 and the passage member 124. After that, the fuel gas is supplied from the plurality of fuel gas inlets 128 formed at the tip of the passage member 124 toward the anode electrode 24.

  For this reason, fuel gas can be supplied more satisfactorily and uniformly from the center side of the anode electrode 24 toward the outer peripheral side, and the effect of increasing the efficiency of the power generation reaction can be obtained. In addition, it is not necessary to provide a fuel gas introduction port in the disk portion 36 of each separator 28, so that the configuration of the separator 28 is simplified and the manufacturing cost can be easily reduced.

  In the first and second embodiments described above, as shown in FIG. 6, the first protrusion 48 has a ring shape (circular ring shape). For example, as shown in FIG. You may make it become a shape. In this case, the intersection of the major axis direction a and the minor axis direction b of the ellipse is used as the center of the first projecting portion 48, and the axis passing through the center and the projecting central axis of the second projecting portion 52 match. The first and second protrusions 48 and 52 are coaxial ”.

  Further, as the second projecting portion 52, a frustoconical shape whose cross section (top surface or the like) in the horizontal direction is a perfect circle shape is illustrated in FIG. 6, but the present invention is not limited to this, and the height is not limited to this. Also included is a trapezoidal cross section in the direction. For example, the cross section in the horizontal direction (top surface or the like) may be elliptical.

  Furthermore, in FIG. 6, the first and second protrusions 48 and 52 are coaxial, that is, the center axis L1 of the first protrusion 48 that is ring-shaped and the protrusion center axis L2 of the second protrusion 52 However, the first and second protrusions 48 and 52 need not be coaxial with each other. For example, as shown in FIG. 15, the protruding central axis L <b> 2 of the second protrusion 52 may be unevenly distributed from the central axis L <b> 1 of the first protrusion 48. Also in this case, the first protrusion 48 may have an elliptical ring shape, and the second protrusion 52 may have an elliptical cross section in the horizontal direction.

1 is a schematic perspective view of a fuel cell stack in which a plurality of fuel cells according to a first embodiment of the present invention are stacked. FIG. 3 is an exploded perspective view of the fuel cell. It is a partially exploded perspective view showing the gas flow state of the fuel cell. It is explanatory drawing of one surface of the said separator. It is explanatory drawing of the other surface of the said separator. It is a perspective explanatory view of the 1st and 2nd projection parts formed in the separator. It is sectional drawing of the said fuel cell stack. It is a schematic cross-sectional explanatory drawing explaining operation | movement of the said fuel cell. It is explanatory drawing of the channel | path member fixed to the said separator. FIG. 8 is a cross-sectional view of the fuel cell stack taken along line XI-XI in FIG. 7. It is a disassembled perspective view of the fuel cell which concerns on the 2nd Embodiment of this invention. 2 is a cross-sectional view of a fuel cell stack in which a plurality of the fuel cells are stacked. FIG. It is a schematic cross-sectional explanatory drawing explaining operation | movement of the said fuel cell. FIG. 7 is an explanatory plan view of first and second protrusions of a different form from FIG. 6. FIG. 15 is a perspective explanatory view of first and second protrusions of a form different from that of FIGS. 6 and 14. 6 is a cross-sectional explanatory view of a fuel cell separator of Patent Document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 120 ... Fuel cell 12, 122 ... Fuel cell stack 20 ... Electrolyte 22 ... Cathode electrode 24 ... Anode electrode 26 ... Electrolyte electrode assembly 28 ... Separator 30 ... Fuel gas supply communication hole 34, 60, 126 ... Bridge part 36 ... disk portions 36a, 36b ... surface 46 ... fuel gas passages 48, 52 ... projections 50 ... oxidant gas passages 53, 64 ... recesses 54 ... fuel gas inlets 56, 124 ... passage members 66 ... fuel gas supply passage 67 ... Oxidant gas supply section 68 ... Exhaust gas passage 69 ... Insulation seal 70a, 70b ... End plate

Claims (7)

A plurality of configured electrolyte electrode assembly across the electrolyte between the anode and the cathode, a fuel cell and configured Rousset separator are stacked alternately one plate,
The separator has a plurality of sandwiching portions that sandwich one electrolyte / electrode assembly together with another separator,
On one surface of the clamping portion has a first protrusion that forms a fuel gas channel for supplying a fuel gas along an electrode surface of said anode electrode is provided,
On the other surface of the clamping portion, the second projecting portion which forms an oxidant gas channel for supplying an oxidant gas along the electrode surface of the cathode electrode is provided,
A fuel gas supply unit for supplying the fuel gas before use along the stacking direction of the electrolyte / electrode assembly and the separator is provided at the center of the separator,
On one surface or the other surface of the clamping portion, a passage member forming a fuel gas supply passage communicating with said fuel gas passage and the fuel gas supply unit,
A fuel gas introduction port is provided that is spaced apart from the center side of the electrolyte / electrode assembly in a direction close to the fuel gas supply unit, communicates with the fuel gas supply passage, and introduces fuel gas into the fuel gas passage. And
The fuel gas introduction port is formed in the passage member when the passage member is provided on one surface of the sandwiching portion, and when the passage member is provided on the other surface of the sandwiching portion. Formed in the clamping part,
Further, the fuel cell includes an exhaust gas passage for exhausting the reaction gas mixed with the fuel gas and the oxidant gas after being used for the reaction in the electrolyte / electrode assembly as exhaust gas,
An oxidant gas supply unit configured to flow in the stacking direction in order to supply the oxidant gas before use to the oxidant gas passage;
Equipped with a,
In the oxidant gas supply unit, the fuel gas supply unit that supplies the fuel gas before use in the stacking direction is provided in an airtight manner,
The fuel gas supply channel connects the said fuel gas passage and the fuel gas supply unit, which and placed the oxidant gas supply unit across the separator surface direction crossing the stacking direction, characterized in Rukoto Fuel cell. 2. The fuel cell according to claim 1 , wherein the exhaust gas passage is provided at an outer peripheral end portion of the separator. A fuel cell according to claim 2 Symbol placement, the fuel gas supply unit, a fuel cell, characterized by being provided hermetically in a central portion of the separator. The fuel cell according to any one of claims 1 to 3 , wherein the oxidant gas flows from the oxidant gas supply unit toward the exhaust gas passage,
The fuel cell, wherein the fuel gas introduction port is set at a position eccentric to the upstream side in the flow direction of the oxidant gas with respect to the center of the electrolyte / electrode assembly. The fuel cell according to any one of claims 1 to 4, wherein the oxygen-containing gas supply unit, the inner peripheral surface and the fuel gas supply portion of the electrolyte electrode assembly and oxidant gas before consumption fuel cell and supplying the oxidant gas passage from between. The fuel cell according to any one of claims 2 to 5, wherein the first protrusion, which has a circular protrusion, the second protrusion, and being formed inside the annular projection Fuel cell. The fuel cell according to any one of claims 2 to 6, said electrolyte electrode assembly, it is more arranged concentrically for the fuel gas supply portion which is formed in the center portion of the separator A fuel cell.

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