JP6054912B2 - Fuel cell and manufacturing method thereof - Google Patents

Description

  The present invention relates to a gas seal for a fuel cell, and relates to a fuel cell for generating power by introducing two types of gas (oxidant gas such as fuel gas and air) into the fuel cell in a separated state, and a method for manufacturing the same.

  Conventionally, as a solid oxide fuel cell, for example, a fuel electrode in contact with a fuel gas is provided on one side of a flat solid oxide layer (solid electrolyte layer), and an air electrode in contact with an oxidant gas is provided on the other side. In addition, a fuel cell is formed by providing a flow path (fuel flow path, air flow path) etc. to the fuel electrode and the air electrode, and the fuel cell and the interconnector plate are stacked alternately and stacked. What is known (fuel cell stack) is known.

  Specifically, as the fuel cell, for example, a single cell made of a solid oxide layer having a fuel electrode and an air electrode, and a flow path for the fuel gas and the oxidant gas are joined to the solid oxide layer. Consists of a separator, a fuel electrode frame disposed around the fuel electrode, an air electrode frame disposed around the air electrode, and an interconnector disposed outside the fuel cell in the plate thickness direction. It has been known.

  In the fuel cell stack, fuel gas or air is supplied to the fuel flow path or air flow path of the stacked fuel battery cells, or from the fuel flow path or air flow path of the fuel cell (after the reaction). In order to discharge fuel gas and air, a fuel gas manifold and an air manifold are provided at the outer edge portion (frame portion) of the fuel cell stack so as to penetrate the fuel cell stack in the stacking direction. It has been known.

  Further, in the fuel cell stack, in order to integrally fix the stacked fuel cells, through holes (insertion holes) penetrating in the stacking direction are formed in the fuel cells, and bolts are inserted into the insertion holes. A device for fixing a fuel cell stack integrally with bolts and nuts is disclosed.

In addition, a technique for fixing the fuel cell stack by using the manifold as an insertion hole and inserting a bolt into the manifold is also known.
Further, in recent years, in order to prevent gas (especially fuel gas) from leaking from between the single cells in which the fuel cells are stacked, the members constituting the fuel cell stack (for example, interconnectors) A technology has been developed in which a sealing material is disposed so as to surround the outer periphery of the fuel battery cell in a frame shape and the periphery of the manifold in the space between the separator and the like.

  As a technique for gas sealing using the sealing material described above, a technique using a compression sealing material (sealing by applying pressure) such as mica (see Patent Document 1), or a sealing material made of glass or glass ceramic is used. Proposed (Patent Documents 2 and 3), a technique using a ceramic sealing material surrounding the manifold concentrically (see Patent Document 4), and the like.

JP 2012-124020 A JP 2009-43550 A JP 2002-141083 A JP 2005-294153 A

  However, when a bolt is inserted into a manifold formed so as to extend in the stacking direction of the fuel cell stack and is fixed with a nut, an opening in the stacking direction in the manifold (that is, an end plate which is a plate at the end in the stacking direction) Since gas is likely to leak between the opening) and the head or nut of the bolt, it is necessary to gas seal this gap, but this examination has not been sufficient in the past.

  For example, when gas-sealing the above gap using a compression sealant, it is difficult to completely prevent gas leakage from the interface between the compression sealant and the end plate, bolt head or nut. It was. Further, gas leakage from the compression seal material itself may occur. When gas leaks (particularly fuel gas leaks) occur in this way, there is a problem in that power generation efficiency is reduced and post-treatment of the leaked gas is necessary.

  Further, when a sealing material made of glass is used, the sealing performance is high, but when a strong force is applied, a glass crack may occur. In addition, in a high temperature environment where the glass is softened, the glass is deformed and spreads around, causing a thickness change in the stacking direction. In that case, glass breakage may occur in the subsequent thermal cycle, and further, for example, electrical insulation between the end plate and the bolts and nuts may not be maintained.

Furthermore, when a ceramic annular sealing material is used, when a strong force is applied, the sealing material may be cracked and gas leakage may occur.
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 and a method for manufacturing the same that can prevent cracking of the sealing material and suitably prevent gas leakage.

(1) The present invention provides, as a first aspect (fuel cell), an electrolyte layer, a fuel electrode provided on one surface of the electrolyte layer and in contact with fuel gas, and provided on the other surface of the electrolyte layer. In a fuel cell in which a plurality of fuel cells having an air electrode in contact with an oxidant gas are stacked, the fuel cell communicates with a fuel manifold that communicates with the space on the fuel electrode side and a space on the air electrode side At least one of the oxidant manifolds is provided so as to penetrate through the stacking direction and open at an opening , and the fuel cell is stacked on at least one of the fuel manifold and the oxidant manifold. is arranged through member protruding outwardly through the direction, the the penetrating member, at least one of the fuel manifold and the oxidant manifold, said opening and said It includes a projecting portion provided so as to cover the circumference in the radial direction of the mouth portion, wherein the penetrating member is in the periphery in the radial direction of the opening is a portion projecting outward, to surround the periphery As described above, the compression seal material and the glass seal material are arranged in parallel along a plane that is sandwiched by the outer surface of the fuel cell and the overhanging portion from the stacking direction and that spreads the outer surface of the fuel cell. It is characterized by.

  In the first aspect, a penetrating member (for example, a bolt) is disposed in the fuel manifold and the oxidant manifold, and a fuel cell (for example, a fuel cell stack) is disposed around a portion where the penetrating member protrudes, that is, around the opening of the manifold. The outer surface of the fuel cell is sandwiched between the outer surface in the stacking direction (for example, the outer surface of the end plate) and the overhang portion (for example, the head of the bolt or the nut) from the stacking direction and surrounds the opening. A compression seal material and a glass seal material are arranged in parallel along an expanding plane (that is, an outer peripheral direction with respect to the axial direction in which the manifold extends: radial direction).

Therefore, the gas leakage between the outer surface of the fuel cell and the overhanging portion can be suitably prevented by the compression sealant and the glass sealant (particularly by the glass sealant that is in close contact with the surroundings). Here, the term “prevention” includes not only the meaning of complete prevention but also the meaning that the leakage can be reduced as compared with the conventional case (the same applies hereinafter).
In addition, even when a large force is applied from the stacking direction, the compression sealing material can suppress excessive force from being applied to the glass sealing material, so that the glass sealing material can be prevented from cracking. Leakage can be prevented.

  Furthermore, even when used in a high temperature environment and the glass is softened, excessive deformation of the glass sealing material is suppressed by the compression sealing material. Therefore, the thickness in the stacking direction can be maintained, and even when a heat cycle is applied, glass breakage can be suppressed, and stable electrical insulation can be achieved.

  As described above, in the first aspect, the occurrence of gas leakage (especially fuel gas gas leakage) can be suitably prevented, so that power generation efficiency is high and there is no need for post-processing of the leaked gas (or easy post-processing). This is a remarkable effect.

Here, the manifold is a flow path of gas (fuel gas or oxidant gas) extending in the stacking direction, and the gas flow path is branched in the middle of the flow path.
(2) In the present invention, as a second aspect, when the projecting portion of the penetrating member is a member integral with the penetrating member, the integral projecting portion and the outer surface of the fuel cell The compression sealing material and the glass sealing material are sandwiched from the stacking direction .

The second aspect exemplifies the protruding portion of the penetrating member.
(3) In the present invention, as a third aspect, in the case where the penetrating member is a bolt and the overhanging portion is the head of the bolt, the bolt has a head and the outer surface of the fuel cell. The compression sealing material and the glass sealing material are sandwiched from the stacking direction .

The third aspect illustrates the penetrating member and the overhanging portion.
(4) In the present invention, as a fourth aspect, when the projecting portion of the penetrating member is a member that engages with the penetrating member, the engaging projecting portion and the outer surface of the fuel cell The compression sealing material and the glass sealing material are sandwiched from the stacking direction.
The fourth aspect exemplifies the protruding portion of the penetrating member.
(5) In the present invention, as a fifth aspect, in the case where the penetrating member is a bolt and the projecting portion is a nut screwed to the bolt, the nut and the outer surface of the fuel cell The compression sealing material and the glass sealing material are sandwiched from the stacking direction.
The fifth aspect illustrates the penetrating member and the overhang portion.
(6) In the sixth aspect of the present invention, as the sixth aspect, the penetrating member is a bolt, and the head of the bolt is disposed as the projecting portion at one opening in the stacking direction. And the outer surface of the fuel cell, the compression seal material and the glass seal material are sandwiched from the stacking direction, and the other opening in the stacking direction is screwed to the bolt as the overhanging portion. And a compression sealing material and the glass sealing material are sandwiched between the nut and the outer surface of the fuel cell from the stacking direction.
The sixth aspect illustrates the penetrating member and the overhanging portion.
( 7 ) In the present invention, as a seventh aspect, the glass sealing material is annularly disposed around the penetrating member disposed in the manifold extending in the laminating direction, and the glass sealing material The compression seal material is disposed on the outer peripheral side.

In the seventh aspect, the compression seal material is disposed so as to surround the outer peripheral side of the glass seal material. Therefore, even when the glass is softened, there is an advantage that the glass is difficult to spread around.

( 8 ) In the present invention, as an eighth aspect, the compression seal material is annularly arranged around the penetrating member arranged in the manifold extending in the laminating direction, and the compression seal material The glass sealing material is disposed on the outer peripheral side.

In the eighth aspect, the glass sealing material is disposed so as to surround the outside of the compression sealing material. Therefore, since the area of a glass sealing material can fully be ensured, there exists an advantage that the gas-sealing property by glass is high.

( 9 ) The present invention, as a ninth aspect, is characterized in that the fuel cell is pressed and assembled in the stacking direction by bolting.
In the ninth aspect, since the fuel cell is fastened and fixed by a bolt (and a nut screwed to the bolt), there is an advantage that the fixation is easy and can be fixed securely.

( 10 ) The present invention provides a fuel cell manufacturing method for manufacturing a fuel cell according to any one of the first to ninth modes, as a tenth mode (a method for manufacturing a fuel cell), in the radial direction of the penetrating member. And the compression sealant and the glass material to be the glass sealant are arranged on the same plane so as to be sandwiched between the outer surface of the fuel cell and the protruding portion of the penetrating member. A first step and, after the first step, a second step of pressing the compression seal material by applying pressure so as to press between the outer surface of the fuel cell and the protruding portion of the penetrating member; After the second step, the glass sealing material is formed by heating at a temperature at which the glass material is softened and then cooling, and the glass sealing material is formed on the fuel cell. And having a third step of bonding the projecting portion of the penetrating member and the side surface.

In the tenth aspect, the compression sealing material and the glass material serving as the glass sealing material are enclosed so as to surround the periphery of the penetrating member in the radial direction and to be sandwiched between the outer surface of the fuel cell and the protruding portion of the penetrating member. Arrange on the same plane. Thereafter, pressure is applied from the stacking direction of the fuel cell to press the compression sealing material, and then the heating is performed at a temperature higher than the temperature at which the glass material softens, and then the glass material is cooled (that is, the softened glass material is cooled and solidified). Thus, the glass sealing material is formed, and the glass sealing material is joined to the outer surface of the fuel cell and the protruding portion of the penetrating member.

By this manufacturing method, the above-described fuel cell can be preferably manufactured.
Hereinafter, each configuration of the present invention will be described.
The compression seal material is a member that performs gas sealing while being deformed by pressing (in the stacking direction) and in close contact with the surrounding structure (in the stacking direction). As the compression seal material, for example, a sheet-like member made of mica or vermiculite can be used.

As this compression sealing material, in addition to gas sealing properties, a material having a function as an elastic stopper that is not compressed more than a certain amount, an electrical insulating property, or the like can be adopted.
-As a glass sealing material, although normal glass (for example, non-crystallized glass) can be used, crystallized glass and partially crystallized glass (semi-crystallized glass) can be used besides that. In addition to the glass component, various materials such as ceramics may be added.

  In addition, it does not specifically limit as a composition of glass, It can select and use suitably from the well-known material which can be softened by heating at the time of manufacture of a fuel cell, and can adhere | attach and gas-seal it closely to the member of a lamination direction.

  Moreover, when forming a glass sealing material, the method of arrange | positioning preform (calcined glass) and a sheet-like glass material, the printing by a glass paste, the application | coating by the dispenser of a glass material, etc. is employable.

The glass sealing material may be disposed only around the opening of the fuel manifold.
-When using a bolt as a member which presses each fuel cell from the lamination direction, a thing with a larger thermal expansion coefficient of a bolt than the thermal expansion coefficient of a glass sealing material is preferable. Thereby, since the compressive stress can be applied to the glass sealing material by the bolt during the operation of the fuel cell (when the glass is not softened), the cracking of the glass can be reduced (compared to the case where the tensile stress is applied).

  In addition, in order to apply a sufficient compressive force to the glass sealing material, when the nut is projected along the axial direction of the bolt (that is screwed into the bolt), that is, when the nut is projected along the axial direction of the glass, It is desirable to arrange the sealing material so that part or all of the sealing material exists. In addition, it is preferable that the glass sealing material exists within the range of twice the outer diameter of the nut (twice the dimension in the radial direction of the nut).

  The fuel manifold and air manifold extending in the stacking direction and the bolts inserted into these manifolds can be arranged coaxially.

(A) is a top view of the solid oxide fuel cell of Example 1, (b) is a side view of the solid oxide fuel cell. It is explanatory drawing which shows the state which fractured | ruptured the solid oxide fuel cell in the lamination direction (along the axial part of the volt | bolt penetrated by the fuel manifold). It is a perspective view which shows the state which decomposed | disassembled the cassette of the solid oxide fuel cell. It is a perspective view which decomposes | disassembles and shows the lamination | stacking part of the cassette and gas seal part of a solid oxide fuel cell. It is a top view which shows the gas seal part which consists of a compression sealing material and glass sealing material which are arrange | positioned on a cassette. It is sectional drawing which shows the state which fractured | ruptured the 1st gas seal part along the lower surface of a nut (perpendicular to a shaft part). (A) is explanatory drawing which shows the flow path of fuel gas, (b) is explanatory drawing which shows the flow path of air. It is explanatory drawing which shows a part of manufacturing procedure of a solid oxide fuel cell. It is explanatory drawing which shows a part of manufacturing procedure of a solid oxide fuel cell. It is explanatory drawing which shows the state of the seal | sticker by a glass sealing material. It is explanatory drawing which shows the state fractured | ruptured in the lamination direction (along the axial part of the volt | bolt penetrated by the fuel manifold) of the solid oxide form fuel cell of Example 2. FIG. It is sectional drawing which shows the state which fractured | ruptured the 1st gas seal part along the lower surface of a nut (perpendicular to a shaft part).

  Embodiments of a fuel cell to which the present invention is applied and a method for manufacturing the same will be described below with reference to the drawings. Hereinafter, a solid oxide fuel cell will be described as an example of the fuel cell.

a) First, the schematic configuration of the solid oxide fuel cell of Example 1 will be described.
As shown in FIG. 1, a solid oxide fuel cell 201 is a device that generates power by receiving supply of a fuel gas (for example, hydrogen) and an oxidant gas (for example, air: in detail, oxygen in the air). Hereinafter, the “solid oxide form” may be omitted.

  This fuel cell 201 includes a fuel cell stack 205 in which a plurality of (for example, 24 stages) flat plate fuel cell cells 203 as power generation units (power generation cells) are stacked, and the fuel cell stack 205 in the stacking direction (FIG. b) in the up-and-down direction) a plurality of bolts 211 to 218 penetrating through and nuts 219 (generic name) to be screwed into end portions (upper portions in this case) of the bolts 211 to 218.

The fuel cell stack 205 includes a plurality of fuel cells 203 electrically connected in series.
Further, as shown in FIGS. 1A and 1B, among the bolts 211 to 218, a fuel gas introduction pipe that supplies fuel gas to the fuel cell 201 is connected to a nut 219 screwed into the second bolt 212. 221 is provided, and the nut 219 that is screwed to the fourth bolt 214 is provided with an air introduction pipe 223 that supplies air to the fuel cell 201. The nut 219 that is screwed to the sixth bolt 216 is A fuel gas discharge pipe 225 for discharging the fuel gas from the fuel cell 201 is provided, and an oxidant gas after power generation (hereinafter sometimes simply referred to as air) is fueled in a nut 219 screwed into the eighth bolt 218. An air discharge pipe 227 for discharging from the battery 201 is provided.

Each configuration will be described below.
As shown in FIG. 2, each fuel battery cell 203 constituting the fuel battery stack 205 is a so-called fuel electrode support membrane type plate-like fuel battery cell 203. A fuel channel 231 through which fuel gas flows and an air channel 233 through which air flows are separately provided between the pair of interconnectors 243 and 243 (having conductivity).

  The fuel cell 203 is provided with a plate-shaped fuel electrode (anode) 235 on the fuel flow path 231 side, and a thin solid electrolyte layer on the surface of the fuel electrode 235 (upper side in FIG. 2). A solid oxide layer 237 is formed. Furthermore, a thin air electrode (cathode) 239 is formed on the surface of the solid oxide layer 237 (upper side in FIG. 2). The fuel electrode 235, the solid oxide layer 237, and the air electrode 239 are referred to as a cell body (single cell) 241.

  Further, in the fuel cell 203, a fuel electrode side current collector 253 (having air permeability made of a metal mesh or the like) is disposed between the fuel electrode 235 and the interconnector 243 on the lower side of FIG. On the surface of one of the interconnectors 243 (lower side in FIG. 2), a large number of block-shaped convex portions serving as the air electrode side current collector 255 are integrally formed.

  Further, the fuel battery cell 203 includes a sheet-like gas seal portion (internal gas seal portion) 245 on the air electrode 239 side and an outer edge of the cell main body (single cell) 241 so as to surround the cell main body (single cell) 241. A separator 247 joined to the upper surface of the portion (specifically, the outer edge of the solid oxide layer 237) and blocking between the air flow path 233 and the fuel flow path 231, and a fuel electrode frame disposed on the fuel flow path 231 side 249, and they are laminated to form a single unit.

The plate members (having the same conductivity as the interconnector 243) at both ends in the stacking direction of the fuel cell 201 are referred to as end plates 251A and 251B.
Further, in the first embodiment, as will be described in detail later, in addition to the gas seal portion 245 in the fuel battery cell 203, a first gas seal that gas seals between one end plate 251A and a predetermined nut 219 is provided. Part 300 and a second gas seal part 310 for gas-sealing between the other end plate 251 </ b> B and predetermined bolts 212 and 216.

  Here, as the solid oxide layer 237, materials such as YSZ, ScSZ, SDC, GDC, and perovskite oxide can be used. Further, as the fuel electrode 235, Ni and a cermet of Ni and ceramic can be used, and as the air electrode 239, a perovskite oxide, various noble metals and cermets of noble metal and ceramic can be used.

  Further, as the interconnector 243, the end plates 251A and 251B, the separator 247, and the fuel electrode frame 249, for example, a metal plate made of ferritic stainless steel such as SUS430 and SUS444 can be used. In addition, each of the bolts 211 to 218 and the nut 219 can employ a metal member made of, for example, Inconel (registered trademark).

In addition, as a thermal expansion coefficient of each metal plate, the range of 8-14 * 10 < ^-6 > / K (20-300 degreeC) is employable, As a thermal expansion coefficient of the bolt 211-218 or the nut 219, it is from a metal plate. For example, 16 × 10 ⁻⁶ / K (20 to 300 ° C.) having a large thermal expansion coefficient can be employed.

Hereinafter, each member constituting the fuel battery cell 203 will be described in more detail.
Since the planar shape of the fuel battery cell 203 is square, the planar shape of each member constituting the fuel battery cell 203 is also square.

  As shown in an exploded view in FIG. 3, the interconnector 243 on which the fuel electrode side current collector 253 is placed, the fuel electrode frame 249, and the separator 247 joined to the cell body (single cell) 241 are the same. The fuel cell cassettes 257 are stacked in the vertical direction in the figure and integrated together (by laser welding described later).

  Among these, the interconnector 243 is a square plate material, and insertion holes (first to eighth insertion holes) 261 to 268 through which the bolts 211 to 218 are inserted are formed at substantially equal intervals on the outer edge portion thereof. Has been. That is, the insertion holes 261 to 268 (the same numbers are assigned to the insertion holes in each member) are formed at eight positions at positions corresponding to the four corners of the interconnector 243 and the midpoint of each side.

Of the insertion holes 261 to 268, the first, third, fifth, and seventh insertion holes 261, 263, 265, and 267 at the four corners are round holes that are not used as gas flow paths for fuel gas or air.
Further, the second and sixth insertion holes 262 and 266 provided on the opposite sides are oval having a long dimension along the side. Among these, the second insertion hole 262 transmits the fuel gas to the fuel cell 203. This is a fuel gas introduction path (fuel manifold on the fuel gas introduction side) to be introduced into the internal fuel flow path 231. On the other hand, the sixth insertion hole 266 is a fuel gas discharge path (fuel manifold on the fuel gas discharge side) for discharging the fuel gas from the fuel flow path 231 in the fuel cell 203.

  Furthermore, the fourth and eighth insertion holes 264 and 268 provided on the other opposing sides are round holes, and among these, the fourth insertion hole 264 is used to supply air to the air flow path 233 in the fuel cell 203. An air introduction path (air manifold on the air introduction side) to be introduced. On the other hand, the eighth insertion hole 268 is an air discharge path (air manifold on the air discharge side) for discharging air from the air flow path 233 in the fuel cell 203.

  For the end plates 251A and 251B, all the insertion holes are the same as the first, third, fifth, and seventh insertion holes 261, 263, 265, and 267 at the four corners (the shape and dimensions in plan view). It is a round hole.

Each fuel manifold or air manifold and each bolt 211 to 218 inserted through each fuel manifold or air manifold are arranged coaxially.
The fuel electrode frame 249 is a square frame-shaped plate member, and the first to eighth insertion holes 261 to 268 through which the bolts 211 to 218 are inserted are formed on the outer edge portion thereof.

  Among them, the second and sixth insertion holes 262 and 266 are formed with slits 271 and 273 in the longitudinal direction (through holes), and the interconnector 243 side (lower side in the figure) of the fuel electrode frame 249. A plurality of grooves 277 and 279 (which serve as fuel gas flow paths) are formed so that the slits 271 and 273 communicate with the opening 275 in the frame.

The separator 247 is a square frame-shaped plate member, and the first to eighth insertion holes 261 to 268 through which the bolts 211 to 218 are inserted are formed on the outer edge portion thereof.
And the cassette 257 of the fuel cell of the structure mentioned above is laminated | stacked through the sheet-like gas seal part 245 between them, as shown in FIG.

  As shown in FIG. 5, the gas seal portion 245 includes a sheet-like compression seal material 291 made of mica and a glass seal material 293 made of glass. Note that the compression sealant 291 and the glass sealant 293 have electrical insulation.

  Specifically, an interconnector 243 (or end plates 251A, 251B) or a separator constituting the fuel cell stack 205 is disposed around the fuel manifold extending in the stacking direction of the fuel cells 203 (the thickness direction of the paper in FIG. 5). The compression sealing material 291 and the glass sealing material 293 are sandwiched by the 247 from the stacking direction and along a plane (plane on which the paper surface spreads) in which the fuel cell 203 extends so as to surround the fuel manifold from the outside (outer peripheral side). They are arranged in parallel in order.

  That is, when viewed from the axial direction (in plan view) of the bolts 212 and 216, and hence the second and sixth insertion holes 262 and 266 that are fuel manifolds, the fuel manifold is surrounded from the radial direction perpendicular to the axial direction. Further, the glass sealing material 263 and the compression sealing material 291 are arranged concentrically. That is, an annular glass sealing material 293 is disposed on the inner side, and a compression sealing material 291 is disposed so as to surround the entire outer peripheral side thereof.

  Specifically, the compression seal material 291 is a square frame-shaped member, and the first to eighth insertion holes 261 to 268 through which the bolts 211 to 218 are inserted are formed on the outer edge portion thereof. The compression sealant 291 has a thickness of 0.40 mm before assembling and 0.36 mm after assembling (after compression).

  Of these, the first, third, fifth, and seventh insertion holes 261, 263, 265, and 267 are round holes, and the fourth and eighth insertion holes 264 and 268 are round holes having a larger diameter. The second and sixth insertion holes 262 and 266 are oval long holes.

  Further, the compression seal material 291 is provided with communication passages 295 and 297 as air flow paths so as to communicate with the fourth and eighth insertion holes 264 and 268 and the opening 299 in the frame, respectively. .

  Further, on the inner peripheral side of the second and sixth insertion holes 262 and 266, the periphery of the second and sixth insertion holes 262 and 266 of the separator 247 is seen from the stacking direction (perpendicular to the paper surface of FIG. 5). An annular glass sealing material 293 having a thickness of 0.3 mm and a width of 3.0 mm is disposed so as to surround it.

  The glass sealing material 293 is a gas sealing material containing glass (for example, containing glass as a main component). Here, for example, a commercially available crystallized glass preform (preliminary sintered body) can be used, and its softening point is, for example, 770 ° C.

Moreover, as this glass sealing material 293, the thermal expansion coefficient is close to the thermal expansion coefficient of the surrounding metal plate (for example, made of ferritic stainless steel), for example, the thermal expansion coefficient is 8 to 14 × 10 ⁻⁶ / K (20 to 300 ° C.) is desirable (for example, 11 × 10 ⁻⁶ / K (20 to 300 ° C.)), for example, G018-311 manufactured by SCHOTT can be used.

  The operating temperature of the fuel cell 201 is, for example, 700 ° C., but is approximately 650 ° C. in the vicinity of the gas seal portion 245. Therefore, as the glass seal material 293, the softening point is higher than the temperature of the gas seal portion 245 during operation. Higher ones are used.

b) Next, the 1st gas seal part 300 and the 2nd gas seal part 310 which are the principal parts of the present Example 1 are demonstrated.
As shown in FIG. 2, in the fuel cell 201 of the first embodiment, one of the second insertion hole 262 and the sixth insertion hole 266 (upper part in the figure) 267a constituting the fuel manifold is provided with an opening end (opening) 267a. A first gas seal portion 300 is provided for gas sealing, and a second gas seal portion 310 is provided for gas sealing the other (lower side) opening end (opening portion) 267b.

  Specifically, the first gas seal portion 300 is arranged on one end plate 251A on the upper side in FIG. 2 and on each opening 267a side of the second and sixth insertion holes 262 and 266 that are fuel manifolds. Between the nuts 219, that is, between the upper surface 252a of one end plate 251A and the lower surface 219a of each nut 219, a gas seal is provided.

The nut 219 is provided so as to cover the opening 267a on one side (upper side of FIG. 2) of the fuel manifold as viewed from the upper side of FIG.
Similarly, the second gas seal portion 310 is disposed on the other end plate 251B on the lower side of FIG. 2 (located on the other opening 267b side of the second and sixth insertion holes 262 and 266 which are fuel manifolds). Between the heads 210 of the bolts 212 and 216, that is, between the lower surface 252b of the other end plate 251B and the upper surface 210b of the head 210 of each bolt 212 and 216, a gas seal is provided.

The heads 2109 of the bolts 212 and 216 are provided so as to cover the opening 267b on the other side (lower side in FIG. 2) of the fuel manifold as viewed from the lower side in FIG.
Among these, as shown in FIG. 6, the first gas seal portion 300 is disposed so as to surround the periphery of the shaft portion 220 (and each insertion hole 262, 266) of each bolt 212, 216 on the same plane. The annular compression seal material 347 and the annular glass seal material 349 (joined to the nut 219 and the end plate 251A) arranged so as to surround the outer periphery of the compression seal material 347.

  Specifically, of the bolts 212 and 216, the end plate protrudes from the fuel cell stack 205 (upward in FIG. 2) in the radial direction so as to surround the periphery from the outside (outer peripheral side). The compression sealing material 347 and the glass are sandwiched between the stacking direction of the fuel battery cells 203 (the thickness direction of the paper surface in FIG. 6) by the 251A and the nut 219, and along the plane in which the fuel battery cells 203 extend (the plane in which the paper sheet extends). Sealing material 349 is arranged in parallel in order.

  That is, as shown in FIG. 6, when viewed from the axial direction of the bolts 212 and 216 (in plan view), it surrounds the periphery of the shaft part 220 of the bolts 212 and 216, that is, the shaft part 220 is defined as the axial direction. A compression seal material 347 and a glass seal material 349 are arranged concentrically so as to surround from the vertical radial direction. That is, an annular compression seal material 347 is disposed on the inner side, and an annular glass seal material 349 is disposed so as to surround the entire outer peripheral side thereof.

  Similarly (refer to FIG. 2), the second gas seal portion 310 is an annular shape disposed so as to surround the periphery of the shaft portion 220 (and each insertion hole 262, 266) of each bolt 212, 216 on the same plane. Compression sealing material 351, and an annular glass sealing material 353 (joined to the head 210 of each bolt 212, 216 or the end plate 251B) disposed so as to surround the periphery of the compression sealing material 351. ing.

  Specifically, of the bolts 212 and 216, the end plate protrudes from the fuel cell stack 205 (downward in FIG. 2) in the radial direction so as to surround the periphery from the outside (outer peripheral side). The compression sealing material 351 and the glass sealing material 353 are sequentially arranged in parallel along the plane in which the fuel cell 203 is sandwiched between the fuel cell 203 and the head 210 of the bolts 212 and 216 from the stacking direction. Has been placed.

  That is, as shown in FIG. 6, when viewed from the axial direction of the bolts 212 and 216 (in plan view), it surrounds the periphery of the shaft part 220 of the bolts 212 and 216, that is, the shaft part 220 is defined as the axial direction. A compression seal material 351 and a glass seal material 353 are arranged concentrically so as to surround from the vertical radial direction. That is, an annular compression seal material 351 is disposed on the inner side, and an annular glass seal material 353 is disposed so as to surround the entire outer peripheral side thereof.

  In the first and second gas seal portions 300 and 310, the compression seal materials 347 and 351 are sheet-like members made of mica, like the gas seal portion 245, and the glass seal materials 349 and 353 are It is composed of glass. In addition, both compression sealing materials 347 and 351 and each glass sealing material 349 and 353 also have electrical insulation.

  Specifically, each compression seal material 347, 351 is a ring with an outer diameter of 17 mm × an inner diameter of 11 mm), the thickness before assembly is 0.5 mm, and the thickness after assembly (after compression) is 0.4 mm. .

  Each glass sealing material 349, 353 is a gas sealing material containing glass (for example, containing glass as a main component). Here, similarly to the gas seal portion 245, for example, a commercially available crystallized glass preform (preliminary sintered body) can be used, and its softening point is, for example, 770 ° C.

Further, as the glass sealing materials 349 and 353, as in the case of the gas seal portion 241, the one having a thermal expansion coefficient close to that of a surrounding metal plate (for example, made of ferritic stainless steel), for example, having a thermal expansion coefficient of 8 -14 × 10 ⁻⁶ / K (20 to 300 ° C.) is desirable (for example, 11 × 10 ⁻⁶ / K (20 to 300 ° C.)), and for example, G018-311 manufactured by SCHOTT can be used.

  The operating temperature of the fuel cell 201 is, for example, 700 ° C., but is around 640 ° C. in the vicinity of the first and second gas seal portions 300, 310. 1. The thing with a softening point higher than the temperature of the 2nd gas seal part 300,310 is used. Further, different materials (for example, materials having different softening points) may be used as the glass seal material 293 of the gas seal portion 245 and the glass seal materials 349 and 353 of the first and second gas seal portions 300 and 310.

  The first, third, fourth, fifth, seventh, and eighth bolts 211, 213, 214, 215, 217, and 218 and the nut 219 screwed to them do not need to be gas sealed, As a spacer, only a compression seal material (not shown) made of an annular mica similar to that used in the first and second gas seal portions 300 and 310 is used.

  Alternatively, the gas having the same configuration as that of the first and second gas seal portions 300 and 310 so that the openings of the fourth and eighth insertion holes 264 and 268 corresponding to the air manifold are gas-sealed similarly to the fuel manifold. A seal portion (not shown) may be provided.

  Alternatively, a gas seal portion (not shown) having the same configuration as the first and second gas seal portions 300 and 310 is provided so that all the openings of the first to eighth insertion holes 261 to 268 are gas-sealed. It may be provided.

c) Next, the gas flow path in the first embodiment will be briefly described.
<Flow path of fuel gas>
As shown in FIG. 7A, the fuel gas introduced from the fuel gas introduction pipe 221 into the fuel cell stack 205 is inserted into the second bolt 212 (which is an introduction side fuel manifold). 262.

  In addition, a groove (not shown) is formed in the axial direction at the tip of the second bolt 212 (upward in the figure), and the space in the fuel gas introduction pipe 221 and the second insertion hole 262 are formed through this groove. The inside communicates (the fuel gas discharge side, the air introduction side and the discharge side have the same structure).

This fuel gas is introduced from the second insertion hole 262 into the fuel flow path 231 inside the fuel cell 203 through the groove 277 of the fuel electrode frame 249 of each fuel cell 203.
Thereafter, the remaining fuel gas that has contributed to power generation in the fuel cell 203 is inserted through the other groove 279 of the fuel electrode frame 249 through the sixth bolt 216 (which is a discharge-side fuel manifold). The gas is discharged from the fuel gas discharge pipe 225 to the outside of the fuel cell stack 205 through the six insertion holes 266.

<Air flow path>
As shown in FIG. 7B, the air introduced into the fuel cell stack 205 from the air introduction pipe 223 is inserted into the fourth insertion hole 264 through which the fourth bolt 214 is inserted (which is an air manifold on the introduction side). be introduced.

  The air is introduced from the fourth insertion hole 264 into the air flow path 233 inside the fuel cell 203 through the communication passage 295 of the compression seal material 291 of each fuel cell 203.

  Thereafter, the remaining air that has contributed to power generation in the fuel cell 203 is inserted into the eighth bolt 218 through the other communication passage 297 of the compression sealant 291 (which is an exhaust-side air manifold). The air is discharged from the air discharge pipe 227 to the outside of the fuel cell stack 205 through the eight insertion holes 268.

d) Next, a method for manufacturing the fuel cell 201 will be described.
As shown in FIG. 8A, a cell body (single cell) 241 in which a fuel electrode 235, a solid oxide layer 237, and an air electrode 239 are integrated (a square plate) is manufactured according to a conventional method. A frame-shaped separator 247 is brazed to the outer edge of the cell body (single cell) 241.

  Next, as shown in FIG. 8B, the fuel electrode frame 249 is sandwiched between the separator 247 and the interconnector 243 (or the end plate 251B), and the fuel electrode frame 249, the separator 247 and the interconnector 243 (by the laser welding). Alternatively, the fuel cell cassette 257 is manufactured by integrally joining the end plate 251B).

  The periphery of the second and sixth insertion holes 262 and 266 that are fuel manifolds and the fourth and eighth insertion holes 264 and 268 that are air manifolds are joined in an annular shape by laser welding, and the separator 247. And the outer edge of the interconnector 243 (or end plate 251B) are joined in an annular shape.

  Accordingly, the gas leakage between the fuel flow path 231, the fuel manifold (second and sixth insertion holes 262 and 266), and the air manifold (fourth and eighth insertion holes 264 and 268) inside the cassette 257 of the fuel cell is Completely prevented.

  Next, as shown in FIG. 8C, a gas seal portion 245 made of a compression seal material 291 and a glass seal material 293 (being a glass material) is disposed between the cassettes 257 of each fuel cell.

  Specifically, as shown in FIG. 5, an annular glass sealing material 293 (and so on) is provided so as to completely surround the fuel manifold (second and sixth insertion holes 262, 266) on the same plane of the surface of each separator 247. The compression sealing material 291 is disposed so as to completely surround the periphery of the glass sealing material 293 (becoming glass material).

  Further, as shown in FIG. 9, on the same plane of the surface of one end plate 251A, an annular shape is formed so as to completely surround the opening 267a on the upper end side of the fuel manifold (second and sixth insertion holes 262, 266). Of the compression sealant 347 and an annular glass sealant 349 (thickness 0.3 mm) thinner than the compression sealant 347 (thickness 0.3 mm) so as to completely surround the outer periphery of the compression sealant 347. Glass material).

  Here, as the compression sealing material 347, a material whose outer diameter is smaller than the (minimum) outer diameter of the nut 219 is used so that the glass sealing material 349 is sandwiched between the end plate 251A and the nut 219.

  Similarly, on the same plane of the surface of the other end plate 251B, an annular compression sealant 351 is provided so as to completely surround the opening 267b on the lower end side of the fuel manifold (second and sixth insertion holes 262, 266). And an annular glass seal material 353 (to be a glass material) that is thinner than the compression seal material 351 after compression (thickness 0.3 mm) so as to completely surround the periphery of the compression seal material 351. Deploy.

  Here, as the compression sealing material 351, a material whose outer diameter is smaller than the (minimum) outer diameter of the head 210 of the bolts 212 and 216 is used, and the glass sealing material 353 includes the end plate 251B and the head 210. To be sandwiched between.

  The compression seal materials 347 and 351 and the glass seal materials 349 and 353 (the glass materials to be formed) are arranged simultaneously when the bolts 212 and 216 are inserted into the insertion holes 262 and 266, respectively. Similarly, a compression seal material is disposed (as a spacer) in the openings of the respective insertion holes 261, 263, 264, 265, 267, 268 other than the fuel manifold.

  Thereafter, by tightening the bolts 211 to 218 and the nut 219, the fuel cell stack 205 is pressed in the stacking direction (vertical direction in FIG. 9) to integrate the fuel cell stack 205.

  At this stage, as shown in FIG. 10 (a), the compression sealant 291 has a thickness of 0.36 mm, which is larger than the thickness of the glass sealant 293 (becoming softened) (the glass material to be formed) is 0.30 mm. Therefore, there is a slight gap between the glass sealing material 293 (becoming glass material) and the interconnector 243.

  Similarly, at this stage, the thickness of the compression seal materials 347 and 351 is 0.4 mm, and the thickness of the glass seal materials 349 and 353 (being softened) is larger than 0.3 mm. There is a slight gap between the sealing materials 349 and 353 (the glass material to be formed) and the nut 219 or the end plate 251B).

  Next, the fuel cell stack 205 (specifically, a glass material that becomes the glass sealants 293, 349, and 353) is heated to, for example, 850 ° C., which is equal to or higher than the crystallization temperature of glass, for 2 hours to crystallize the glass. In the process of raising the crystallization temperature from the softening point (770 ° C.) of the glass, the glass sealing materials 293, 349, and 353 are softened.

  Therefore, as shown in FIG. 10B, the glass sealing material 293 in the fuel cell stack 205 is rounded by its own surface tension and becomes convex upward, and finally the upper interconnector 243 (or It contacts the end plate 251A). Furthermore, glass is crystallized by heating at 850 ° C. for 2 hours.

  Similarly, the glass sealing material 349 outside the fuel cell stack 205 is in close contact with the surface of the end plate 251A and the surface of the nut 219, which are peripheral members, and the glass sealing material 353 is the end plate, which is a peripheral member. 251B and bolts 212 and 216 are in close contact with the surface of the head 210.

  Thereafter, by cooling, the glass sealing material 293 in the fuel cell stack 205 is firmly joined to the separator 247 and the interconnector 243 (or the end plate 251A) as shown in FIG.

  Similarly, the glass seal material 349 outside the fuel cell stack 205 is firmly bonded to the end plate 251A and the nut 219, and the glass seal material 353 is firmly bonded to the end plate 251B and the heads 210 of the bolts 212 and 216. To do.

  The glass sealing materials 293, 349, and 353 are softened when the glass is heated. As described above, the thermal expansion coefficients of the bolts 211 to 218 are the separator 247, the interconnector 243, the fuel electrode frame 249, the end plate 251A, Since the thermal expansion coefficient of the metal plate arranged in the stacking direction such as 251B or the like and the thermal expansion coefficient of the glass sealing material 293 is larger, the fuel cell stack 205 becomes loose as a whole when the glass is heated (bolt Although the pressing force of 211 to 218 is reduced, it is not lost).

  After that, when cooled, the bolts 211 to 218 and the like shrink in the stacking direction (return to the original) to become a compression field, so that the glass sealing materials 293, 349, and 353 are sealed in a compressed state. (Ie sealed by glass).

In this way, the gas seal configuration is realized and the fuel cell 201 is completed.
d) The effect of the first embodiment will be described.

<Effects of the first and second gas seal portions 300 and 310>
In the first embodiment, first and second gas seal portions 300 and 310 are provided around both openings 267a and 267b in the stacking direction of the second and sixth insertion holes 262 and 266 that are fuel manifolds. Yes. That is, a first gas seal portion 300 is provided between one end plate 251A and the nut 219, and a second gas seal portion is provided between the other end plate 251B and the heads 210 of the bolts 262 and 266. A portion 310 is provided.

  Specifically, in the first gas seal portion 300, an annular compression seal material 347 is disposed along a plane in which the end plate 251A extends so as to surround one opening 267a of the second and sixth insertion holes 262, 266. Further, the glass sealing material 349 is arranged in parallel so as to surround the compression sealing material 347 on the same plane from the outside in the radial direction.

  Similarly, in the second gas seal portion 310, an annular compression seal material 351 is disposed along a plane in which the end plate 251B extends so as to surround the other openings 267b of the second and sixth insertion holes 262, 266. Further, the glass sealing material 353 is arranged in parallel so as to surround the compression sealing material 351 on the same plane from the outside in the radial direction.

  Accordingly, the compression seal materials 347 and 351 and the glass seal materials 349 and 353 (especially by the glass seal materials 349 and 353 that are in close contact with the surroundings) allow the end plates 251A and 251B and the heads 210 and nuts 219 of the bolts 262 and 266 to It is possible to suitably prevent gas leakage between the two.

  In addition, even when a large force is applied from the stacking direction, the compression seal materials 347 and 351 can prevent excessive force from being applied to the glass seal materials 349 and 353, thus preventing the glass seal materials 349 and 353 from being broken. In this respect, gas leakage can be suitably prevented.

Further, even when the glass is softened when used in a high temperature environment, excessive deformation of the glass sealing materials 349 and 353 is suppressed by the compression sealing materials 347 and 351.
Further, the compression seal materials 345 and 351 and the glass seal materials 345 and 353 can ensure electrical insulation between the end plates 251A and 251B and the bolts 262 and 266 and the nut 219.

<Effects of Gas Seal Unit 245 in Fuel Cell Stack 205>
In the first embodiment, around the second and sixth insertion holes 262 and 266 that are fuel manifolds and the fourth and eighth insertion holes 264 and 268 that are air manifolds, a separator 247 and an interconnector 243 (or Gas seal portions 245 are arranged so as to be sandwiched by the end plates 251B) from the stacking direction and surround each manifold.

  Specifically, an annular glass sealing material 293 is disposed along a plane in which the fuel cell 203 is expanded (that is, the radial direction of each manifold) so as to surround each manifold, and the glass sealing material 293 is further arranged on the same plane. The compression seal material 291 is arranged in parallel so as to surround from the radial direction.

  Therefore, the compression sealant 291 and the glass sealant 293 (particularly by the glass sealant 293 that is in close contact with the surroundings) can suitably prevent gas leakage between each manifold and the separator 247, the interconnector 243, and the like.

  In addition, even when a large force is applied from the stacking direction, the compression sealant 291 can suppress an excessive force from being applied to the glass sealant 293, so that the glass sealant 293 can be prevented from cracking. Gas leakage can be suitably prevented.

  Furthermore, even when the glass is softened when used in a high temperature environment, the compression sealant 291 suppresses excessive deformation of the glass sealant 293, so that the glass spreads around and the electrical connectivity is reduced. Can be prevented.

<Overall effect>
As described above, in the first embodiment, the occurrence of gas leakage of the fuel gas can be suitably prevented, so that the power generation efficiency is high and there is no need for post-processing of the leaked gas (or post-processing is easy). Has an effect.

  Further, in the first embodiment, since the fuel cell stack 205 is fastened and pressed by the bolts 211 to 218 and the nut 219, there is an advantage that the fixing is easy and can be surely fixed.

  Further, the temperature of the fuel cell 201 varies according to the operation (ON) and stop (OFF) of the operation of the fuel cell 201. In the first embodiment, the above-described configuration (relationship between the thermal expansion coefficients of the respective parts) is used. Even if the temperature fluctuates, the glass sealing materials 349, 353 and the like can always be pressed, so that there is also an advantage that gas leakage can be prevented.

Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
Since the second embodiment differs from the first embodiment in the configuration of the first and second gas seal portions of the fuel cell, the first and second gas seal portions will be described. In addition, about the other structure, the same number as the said Example 1 is used.

  As shown in FIG. 11, in the fuel cell 401 of the second embodiment, as in the first embodiment, the openings 267a and 267b of the second and fourth insertion holes 262 and 264 constituting the fuel manifold are gas-filled. A first gas seal portion 403 and a second gas seal portion 405 are provided so as to seal.

  Among these, as shown in FIG. 12, the first gas seal portion 403 is disposed so as to surround the periphery of the shaft portion 220 (and each insertion hole 262, 266) of each bolt 212, 216 on the same plane. The annular glass sealing material 407 and the annular compression sealing material 409 arranged so as to surround the periphery of the outside of the glass sealing material 407.

The first gas seal portion 403 provides a gas seal between the end plate 351A and the nut 219, as in the first embodiment.
Similarly, the second gas seal portion 405 is an annular glass seal material 411 disposed on the same plane so as to surround the periphery of the shaft portion 220 (and each insertion hole 262, 266) of each bolt 212, 216. And an annular compression sealing material 413 disposed so as to surround the periphery of the outside of the glass sealing material 411.

As in the first embodiment, the second gas seal portion 405 provides a gas seal between the end plate 351B and the heads 210 of the bolts 212 and 216.
Also in the second embodiment, the same effects as in the first embodiment are obtained.

As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various aspect can be taken.
(1) For example, a gas seal portion similar to the first and second gas seal portions may be provided so that the opening portion of the insertion hole corresponding to the air manifold is gas-sealed in the same manner as the fuel manifold.

(2) Moreover, you may provide the gas seal part similar to a 1st, 2nd gas seal part so that the opening part of all the penetration holes may be gas-sealed.
(3) Further, as a method of pressing the fuel cell stack in the stacking direction, in addition to the above-described tightening by bolt and nut screwing, for example, a method of putting a weight so as to apply a load in the stacking direction, a spring is used. Examples include a method of pressing in the stacking direction.

(4) As the bolt, for example, a solid bolt (with no space inside) or a hollow bolt (with a space along the axial direction) can be adopted.
Each fuel manifold or air manifold and each bolt inserted through each fuel manifold or air manifold may not be arranged coaxially (not shown). Each bolt may be arranged outside each fuel manifold or air manifold (not shown).

  (5) The present invention is not limited to a solid oxide fuel cell (SOFC), but is applied to a high-temperature type fuel cell having an operating temperature range of about 600 ° C. or more, such as a molten carbonate fuel cell (MCFC). Is possible.

201, 401 ... Fuel cell 203 ... Fuel cell 205 ... Fuel cell stack 210 ... Head 211, 212, 213, 214, 215, 216, 217, 218 ... Bolt 219 ... Nut 220 ... Shaft 235 ... Fuel electrode 237 ... Solid oxide layer (solid electrolyte layer)
239 ... Air electrode 241 ... Cell body (single cell)
245 ... Gas seal part (internal gas seal part)
251A, 251B ... End plates 261, 262, 263, 264, 265, 266, 267, 268 ... Insertion holes 257 ... Cassettes 291, 347, 351, 409, 413 ... Compression sealants 293, 349, 353, 407, 411 ... Glass sealing material
267a, 267b ... opening 300, 403 ... first gas seal part 310, 405 ... second gas seal part

Claims (10)

A fuel cell having an electrolyte layer, a fuel electrode provided on one surface of the electrolyte layer and in contact with the fuel gas, and an air electrode provided on the other surface of the electrolyte layer and in contact with the oxidant gas, In a stacked fuel cell,
In the fuel cell, at least one of a fuel manifold communicating with the space on the fuel electrode side and an oxidant manifold communicating with the space on the air electrode side penetrates in the stacking direction and opens at an opening. Provided in
And, at least one of the fuel manifold and the oxidant manifold is provided with a penetrating member that penetrates the fuel cell in the stacking direction and projects outward.
The penetrating member includes an overhanging portion provided to cover at least one of the fuel manifold and the oxidant manifold so as to cover the opening and the circumference in the radial direction of the opening,
The peripheral portion in the radial direction of the opening, which is a portion where the penetrating member protrudes outward , is sandwiched from the stacking direction by the outer surface of the fuel cell and the overhanging portion so as to surround the periphery. A fuel cell, wherein a compression sealant and a glass sealant are arranged in parallel along a plane in which the outer surface of the fuel cell extends. When the projecting portion of the penetrating member is a member integral with the penetrating member , the compression sealing material and the glass sealing material are separated by the integral projecting portion and the outer surface of the fuel cell. The fuel cell according to claim 1, wherein the fuel cell is sandwiched from the stacking direction . When the penetrating member is a bolt and the projecting portion is a head portion of the bolt, the compression sealing material and the glass sealing material are formed by the head portion of the bolt and the outer surface of the fuel cell. The fuel cell according to claim 2, wherein the fuel cell is sandwiched from the stacking direction . When the projecting portion of the penetrating member is a member that engages with the penetrating member, the compression sealing material and the glass sealing material are formed by the projecting engaging portion and the outer surface of the fuel cell. The fuel cell according to claim 1, wherein the fuel cell is sandwiched from the stacking direction. When the penetrating member is a bolt and the overhanging portion is a nut that is screwed into the bolt, the compression sealing material and the glass sealing material are connected to each other by the nut and the outer surface of the fuel cell. The fuel cell according to claim 4, wherein the fuel cell is sandwiched from the stacking direction. The penetrating member is a bolt;
The head portion of the bolt is disposed as the projecting portion on one opening side in the stacking direction, and the compression seal material and the glass seal material are formed by the head portion of the bolt and the outer surface of the fuel cell. Between the stacking direction,
In addition, on the other opening side in the stacking direction, a nut that is screwed to the bolt as the projecting portion is disposed, and the compression sealant and the glass seal are formed by the nut and the outer surface of the fuel cell. The fuel cell according to claim 1, wherein a material is sandwiched from the stacking direction. The glass sealing material is annularly disposed around the penetrating member disposed in the manifold extending in the stacking direction of the at least one, and the compression sealing material is disposed on the outer peripheral side of the glass sealing material. the fuel cell according to any one of claims 1 to 6, characterized in that there. The compression seal material is annularly disposed around the penetrating member disposed in the manifold extending in the stacking direction of the at least one, and the glass seal material is disposed on the outer peripheral side of the compression seal material. the fuel cell according to any one of claims 1 to 6, characterized in that there. The fuel cell, by bolting, the fuel cell according to any one of claims 1-8, characterized in that is assembled by being pressed in the stacking direction. In the manufacturing method of a fuel cell to produce a fuel cell according to any one of the preceding claims 1-9,
The compression sealant and the glass material to be the glass sealant are surrounded by the penetration member in the radial direction and sandwiched between the outer surface of the fuel cell and the protruding portion of the penetration member. A first step of arranging on the same plane;
After the first step, a second step of pressing the compression seal material by applying pressure so as to press between the outer surface of the fuel cell and the protruding portion of the penetrating member;
After the second step, the glass sealing material is formed by heating at a temperature higher than the temperature at which the glass material softens and then cooling, and the glass sealing material is formed on the outer surface of the fuel cell and the penetrating member. A third step of joining to the overhang portion of
A method for producing a fuel cell, comprising: