JP5709670B2 - Fuel cell device - Google Patents

Description

  The present invention relates to a fuel cell device.

  In recent years, as next-generation energy, a plurality of fuel cells that generate power at a high temperature of 600 ° C. to 1000 ° C. using a fuel gas (hydrogen-containing gas) and an oxygen-containing gas (air, etc.) via a current collecting member 2. Description of the Related Art Fuel cell devices that are electrically connected in series are known. And it is known to join a fuel battery cell and a current collection member using a conductive joining material (see, for example, Patent Document 1).

JP 2005-339904 A

  When the fuel cell and the current collecting member are joined via the conductive bonding material, the current flows through the current collecting member and the conductive bonding material for the portion joined via the conductive bonding material. In the part where the member is away from the fuel cell (the part which is not joined with the conductive joining material), the current flows only through the current collecting member, so that the current concentration is in the part which is not joined with the conductive joining material. As a result, there is a problem that the resistance increases at this portion and the current collection efficiency decreases.

  An object of this invention is to provide the fuel cell apparatus which can suppress the current concentration in a current collection member.

The fuel cell device of the present invention comprises a plurality of fuel cells and a current collecting member that is disposed between the plurality of fuel cells and electrically connects the adjacent fuel cells, and A fuel cell device in which a fuel cell and a current collecting member are joined by a conductive joining material, wherein the current collecting member faces each of the adjacent fuel cells. The cell facing portion, the first and second cell spacing portions extending from the first and second cell facing portions so as to be separated from the adjacent fuel cells, and the first and second cell spacing portions are connected. A connecting portion, wherein the fuel cell and the first and second cell facing portions of the current collecting member are joined by the conductive joining material, and the fuel cell and the current collector are further joined. At least the first and second cell separation portions of the electric member Meanwhile DOO is joined by the conductive joining material, wherein a plurality of fuel cells is the flat portion has a power generation unit that is configured to sandwich the solid electrolyte by a pair of electrodes in the flat part The second cell facing portion faces the power generating portion, and the power generating portion is formed to protrude outward from the second cell facing portion, and is a portion protruding outward from the second cell facing portion of the power generating portion. The second cell separation portion extending from the second cell facing portion is joined by the conductive joining material .

  According to the fuel cell device of the present invention, the fuel cell and the first and second cell facing portions of the current collecting member are joined by the conductive joining material, and further, the first and second of the fuel cell and the current collecting member are joined. Since at least one of the two cell separation portions is joined by the conductive joining material, the first and second current collecting members are disposed between the fuel cell and the first and second cell facing portions of the current collecting member. The cell facing portion and the conductive bonding material serve as a current path, and the first and second current collecting members are disposed between the fuel cell and at least one of the first and second cell separation portions of the current collecting member. Since at least one of the cell separation portions and the conductive bonding material serve as a current path, current concentration in the current collecting member can be relaxed, an increase in electrical resistance can be suppressed, and high current collecting efficiency can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS The fuel cell apparatus which is the 1st Embodiment of this invention is shown, (a) is a side view which shows a fuel cell apparatus roughly, (b) expands and shows a part of (a). It is a cross-sectional view. FIGS. 1A and 1B show a fuel cell shown in FIG. 1, in which FIG. 1A is a cross-sectional view, and FIG. FIG. 2 shows an excerpt of the current collecting member shown in FIG. 1, (a) is a perspective view, and (b) is a cross-sectional view along the line BB. It is a cross-sectional view showing a state where a pair of fuel cells are electrically connected by a current collecting member, (b) is a current flow in the fuel cell device in which the current collecting member and the interconnector are connected by a conductive bonding material. It is explanatory drawing which shows a flow. It is a cross-sectional view showing a conventional fuel cell device. 1 shows a state in which a pair of fuel cells are joined by a conductive joining material via a current collecting member, (a) is a joining state of the first and second cell facing portions of the current collecting member and the fuel cells. (B) is a longitudinal cross-sectional view which shows the joining state of the 1st, 2nd cell separation part of a current collection member, and a fuel cell. 2 shows a second embodiment in which a pair of fuel cells are joined by a current collecting member via a current collecting member, and the first and second cell separation portions, the interconnector, and the air electrode layer are made of a conductive joining material. It is a cross-sectional view showing a joined state. It is an external appearance perspective view which decomposes | disassembles and shows the fuel cell module formed by accommodating the fuel battery cell apparatus shown in FIG. 1 in a storage container. It is a perspective view which shows the fuel cell apparatus formed by accommodating the fuel cell module shown in FIG. 8 in an exterior case.

  A fuel cell device 1 according to a first embodiment of the present invention will be described with reference to FIG. 1 to 8, for easy understanding, the cross-sectional view shows the thickness enlarged and reduced, and the side view shows the length and width enlarged and reduced.

  The fuel cell device 1 includes a fuel electrode layer 8 which is an inner electrode layer on one main surface of a generally columnar conductive support 7 having a pair of opposing main surfaces, a solid electrolyte layer 9, In addition, the fuel cell unit 3 includes a power generation unit that is formed by laminating an air electrode layer 10 that is an outer electrode layer in this order. A plurality of gas flow paths 12 are provided inside the conductive support 7.

  The fuel battery cell 3 has a columnar shape (hollow flat plate shape) in which the interconnector 11 is laminated on a portion of the other main surface where the outer electrode layer is not formed. By arranging current collecting members 4 between adjacent fuel cells 3 arranged in a row, a cell stack 2 is provided in which the fuel cells 3 are electrically connected in series.

  Although the fuel cell 3 and the current collecting member 4 will be described in detail later, the fuel cell 3 and the current collecting member 4 are joined via a conductive joining material 13, whereby a plurality of fuel cells 3 are electrically connected via the current collecting member 4. And the cell stack 2 is formed by mechanically joining.

  Further, a P-type semiconductor layer (not shown) can be provided on the outer surface of the interconnector 11. By connecting the current collecting member 4 to the interconnector 11 via the P-type semiconductor layer, the contact between them becomes an ohmic contact, and the potential drop can be reduced. This P-type semiconductor layer may also be provided on the outer surface of the air electrode layer 10.

That is, as can be understood from the shape shown in FIG. 2, the conductive support 7 includes a pair of parallel flat surfaces n and arcuate surfaces (side surfaces) m that connect the pair of flat surfaces n respectively. It consists of Both surfaces of the flat surface n are formed substantially parallel to each other, and a porous fuel electrode layer 8 is provided so as to cover one flat surface n (lower surface) and the arcuate surfaces m on both sides. A dense solid electrolyte layer 9 is laminated so as to cover the electrode layer 8. A porous air electrode layer 10 is laminated on the solid electrolyte layer 9 so as to face the fuel electrode layer 8.

  In other words, the fuel electrode layer 8 and the solid electrolyte layer 9 are formed to the other flat surface n (upper surface) via the arcuate surfaces m at both ends of the conductive support 7, and both end portions of the solid electrolyte layer 9. Both ends of the interconnector 11 are joined to each other, and the conductive support 7 is surrounded by the solid electrolyte layer 9 and the interconnector 11 so that the fuel gas flowing through the interconnector 11 does not leak to the outside.

  And the lower end part of each fuel cell 3 which comprises the cell stack 2 is in the gas tank 6 for supplying fuel gas to the fuel cell 3 via the gas flow path 12 provided in the inside of the fuel cell 3 The fuel cell device 1 is configured by being fixed by a sealing material (not shown) such as glass.

  In the fuel cell device 1 shown in FIG. 1, a hydrogen-containing gas flows as a fuel gas in the gas flow path 12 of the fuel cell 3, and the inside of the current collecting member 4 disposed between the fuel cells 3. The oxygen-containing gas (air) flows. As a result, the fuel gas is supplied from the gas tank 6 to the fuel electrode layer 8, and the oxygen-containing gas is supplied to the air electrode layer 10 through the inside of the current collecting member 4, thereby generating power in the fuel cell 3. In the following description, the outer electrode layer is described as the air electrode layer 10 and the inner electrode layer is described as the fuel electrode layer 8.

  The fuel cell device 1 includes an elastically deformable conductive member 5 having a lower end fixed to a gas tank 6 so as to sandwich the cell stack 2 from both ends in the arrangement direction x of the fuel cells 3. Here, the conductive member 5 shown in FIG. 1 has a flat plate portion 5 a provided so as to be positioned at both ends of the cell stack 2 and a shape extending outward along the arrangement direction x of the fuel cells 3. And a current extraction part 5b for extracting a current generated by the power generation of the cell stack 2 (fuel cell 3). The arrangement direction x of the fuel cells 3 is also the flow direction of the current generated by the fuel cell device 1.

Below, each member which comprises the fuel cell 3 is demonstrated. As the fuel electrode layer 8, generally known ones can be used. Porous conductive ceramics such as ZrO ₂ (referred to as stabilized zirconia) in which a rare earth element is dissolved and Ni and / or NiO are used. And can be formed from

The solid electrolyte layer 9 has a function as an electrolyte that bridges electrons between the electrodes, and at the same time, has to have a gas barrier property in order to prevent leakage between the fuel gas and the oxygen-containing gas. , 3 to 15 mol% of rare earth elements are formed from ZrO ₂ as a solid solution. In addition, as long as it has the said characteristic, you may form using other materials, such as a lanthanum gallate.

The air electrode layer 10 is not particularly limited as long as it is generally used. For example, the air electrode layer 10 can be formed of a conductive ceramic made of a so-called ABO ₃ type perovskite oxide. The air electrode layer 10 needs to have gas permeability, and can have an open porosity of 20% or more, particularly 30 to 50%.

Although the interconnector 11 can be formed from conductive ceramics, it needs to have reduction resistance and oxidation resistance because it comes in contact with a fuel gas (hydrogen-containing gas) and an oxygen-containing gas (air, etc.). Therefore, lanthanum chromite (LaCrO ₃ ) can be used. The interconnector 11 is dense in order to prevent leakage of fuel gas flowing through the plurality of gas flow paths 12 formed in the conductive support 7 and oxygen-containing gas flowing outside the conductive support 7. The relative density is preferably 93% or more, particularly 95% or more.

  The conductive support 7 is required to be gas permeable in order to permeate the fuel gas up to the fuel electrode layer 8 and to be conductive in order to collect current through the interconnector 11. The Therefore, as the conductive support 7, it is necessary to use a material that satisfies this requirement, and for example, conductive ceramics, cermets, and the like can be used.

  When the fuel cell 3 is manufactured, in the case where the conductive support 7 is manufactured by co-firing with the fuel electrode layer 8 or the solid electrolyte layer 9, the conductivity is made from the iron group metal component and the specific rare earth oxide. A support 7 can be formed. Further, the conductive support 7 preferably has an open porosity of 30% or more, particularly 35 to 50% in order to have the required gas permeability, and the conductivity is 50 S / cm or more. Further, it may be 300 S / cm or more and 440 S / cm or more.

Furthermore, as a P-type semiconductor layer (not shown), a layer made of a transition metal perovskite oxide can be exemplified. Specifically, those having higher electron conductivity than lanthanum chromite constituting the interconnector 11, for example, lanthanum manganite (LaSrMnO ₃ ), lanthanum ferrite (LaSrFeO ₃ ) in which Mn, Fe, Co, etc. exist at the B site. P-type semiconductor ceramics made of at least one of lanthanum cobaltite (LaSrCoO ₃ ) and the like can be used. In general, the thickness of such a P-type semiconductor layer is preferably in the range of 30 to 100 μm.

  The conductive bonding material 13 is provided for bonding the fuel cell 3 and the current collecting member 4 and can be formed using conductive ceramics or the like. As the conductive ceramics, the same ceramics as those forming the air electrode layer 10 can be used. When the conductive ceramic is formed of the same component as the air electrode layer 10, the bonding strength between the air electrode layer 10 and the conductive bonding material 13 is increased. Since it becomes high, it is preferable to form with the same component as the air electrode layer 10.

Specifically, LaSrCoFeO ₃ , LaSrMnO ₃ , LaSrCoO ₃ or the like can be used. These materials may be produced using a single material, or the conductive bonding material 13 may be produced by combining two or more kinds.

  The conductive bonding material 13 may be made of a different material having a different particle diameter from the air electrode layer 10 or may be made of a different material having the same particle diameter. Furthermore, it may be composed of the same material having different particle diameters, or may be composed of the same material having the same particle diameter. When different particle diameters are used, it is preferable that the fine particle diameter is 0.1 to 0.5 μm and the coarse particle diameter is 1.0 to 3.0 μm. Moreover, when comprising the electroconductive joining material 13 with the same particle size, it is preferable that a particle size shall be 0.5-3 micrometers.

  Thus, by producing the conductive bonding material 13 using materials having different particle sizes, coarse particles having a large particle size improve the strength of the conductive bonding material 13, and fine particles having a small particle size are made conductive. The sinterability of the bonding material 13 can be improved.

Next, the current collecting member 4 will be described with reference to FIG. The current collecting member 4 includes a plurality of plate-like first cell facing portions 4a1 joined to one adjacent fuel cell 3 and plates extending from both sides of the first cell facing portion 4a1 so as to be separated from the fuel cells. First plate-like separation portion 4a2, a plurality of plate-like second cell facing portions 4b1 joined to the other adjacent fuel cell 3, and from both sides of the second cell facing portion 4b1 so as to be separated from the fuel cells. And an extended plate-like second separation portion 4b2.

  Further, the first connecting portion 4c that connects one ends of the plurality of first spacing portions 4a2 and the plurality of second spacing portions 4b2, and the other ends of the plurality of first spacing portions 4a2 and the plurality of second spacing portions 4b2. The second connecting portion 4d to be connected is a set of units, and a plurality of sets of these units are connected in the longitudinal direction of the fuel cell 3 by a conductive connecting piece 4e. As shown in FIG. 4, the first cell facing portion 4 a 1 and the second cell facing portion 4 b 1 are portions that are joined to the fuel battery cell 3, and these portions are portions where the generated power of the fuel battery cell 3 is taken in and out. It has become.

  That is, the fuel cell 3 and the first and second cell facing portions 4 a 1 and 4 b 1 of the current collecting member 4 are joined by the conductive joining material 13, and further, the first cell separation portion between the fuel cell 3 and the current collecting member 4. 4a2 is joined with the conductive joining material 13.

  In other words, the plurality of fuel cells 3 have a flat portion, and the flat portion has the interconnector 11, the first cell facing portion 4a1 faces the interconnector 11, and the interconnector 11 The first cell facing portion 4a1 protrudes outward from both sides, and the portion of the interconnector 11 that protrudes outward from both sides of the first cell facing portion 4a1 extends from both sides of the first cell facing portion 4a1. The cell separation portion 4 a 2 is joined by the conductive joining material 13.

  Furthermore, in other words, the interconnector 11 is joined to the surface of the conductive support 7 where the solid electrolyte 9 is not formed and to both ends of the solid electrolyte 9, and the surface where the interconnector 11 is formed and the first cell facing surface The conductive support 7 joins the portion 4a1 and the first separation portion 4a2.

  Conventionally, as shown in FIG. 5, although the fuel cell 3 and the first and second cell facing portions 4 a 1 and 4 b 1 of the current collecting member 4 are joined by the conductive joining material 13, The first and second cell separation portions 4 a 2 and 4 b 2 of the electric member 4 were not joined by the conductive joining material 13. In such a fuel cell device, the generated current from the fuel cell flows through the first and second cell facing portions 4a1, 4b1 of the current collecting member 4 via the interconnector 11 and the conductive bonding material 13, and the current Concentration occurred.

  On the other hand, in the fuel cell device 1 of the present embodiment, as shown in FIG. 4B, between the fuel cell 3 and the first and second cell facing portions 4a1, 4b1 of the current collecting member 4. In addition, the first and second cell facing portions 4a1, 4b1 of the current collecting member 4 and the conductive bonding material 13 serve as a current path, and further, the fuel cell 3 and the first cell separation portion 4a2 of the current collecting member 4 Since the first cell separation portion 4a2 of the current collecting member 4 and the conductive bonding material 13 serve as a current path, the current concentration in the current collecting member 4 is alleviated and the temperature rise of the current collecting member 4 is suppressed. In addition, an increase in electrical resistance can be suppressed and high current collection efficiency can be maintained.

  Further, the fuel cell 3 and the first and second cell facing portions 4 a 1 and 4 b 1 of the current collecting member 4 are joined by the conductive joining material 13, and further, the first cell separation portion between the fuel cell 3 and the current collecting member 4. Since 4a2 is joined by the conductive joining material 13, the joining strength between the fuel cell 3 and the current collecting member 4 can be improved.

FIG. 6A shows a joined state between the fuel cell 3 and the first and second cell facing portions 4a1 and 4b1 of the current collecting member 4, and FIG. 6B shows the fuel cell 3 and the current collecting member 4. The joining state with the first and second cell separation portions 4a2, 4b2 is shown. 6A is a longitudinal sectional view taken along line xx in FIG. 4A, and FIG. 6B is a longitudinal sectional view taken along line yy in FIG. 4A. In addition, you may join with the conductive joining material 13 so that the current collection member 4 may be embedded.

  In the fuel battery cell 3, as described above, the portion where the fuel electrode layer 8 and the air electrode layer 10 face each other through the solid electrolyte layer 9 is a portion that generates power. Therefore, in order to efficiently collect the current generated by the power generation unit of the fuel cell 3, the length of the current collecting member 4 along the longitudinal direction of the fuel cell 3 is the outer electrode layer in the fuel cell 3. It is preferable that the length is equal to or greater than 10 in the longitudinal direction.

  The current collecting member 4 needs to have heat resistance and conductivity, and can be made of a metal or an alloy. In particular, the current collecting member 4 can be produced from an alloy containing Cr at a rate of 4 to 30% because it is exposed to a high-temperature oxidizing atmosphere, such as an Fe—Cr alloy or an Ni—Cr alloy. Can be produced.

  Further, since the current collecting member 4 is exposed to a high-temperature oxidizing atmosphere when the fuel cell device 1 is operated, an oxidation resistant coating may be applied to the surface of the current collecting member 4. Thereby, deterioration of the current collecting member 4 can be reduced. It is preferable to apply the oxidation resistant coating to the entire surface of the current collecting member 4. Thereby, it can suppress that the surface of the current collection member 4 is exposed to high temperature oxidation atmosphere.

  Here, a method for producing the current collecting member 4 will be described. A single rectangular plate member is pressed to form a plurality of slits extending in the width direction of the plate member in the longitudinal direction of the plate member. And the current collection member shown in FIG. 3 is made to protrude alternately by the site | part between the slits used as the 1st cell facing part 4a1, the 1st cell separation part 4a2, the 2nd cell facing part 4b1, and the 2nd cell separation part 4b2. 4 can be produced.

  FIG. 7 shows the second embodiment. In this embodiment, the fuel cell 3 and the first and second cell facing portions 4a1, 4b1 of the current collecting member 4 are joined by the conductive joining material 13, Further, the fuel cell 3 and the first and second cell separation portions 4 a 2 and 4 b 2 of the current collecting member 4 are joined by the conductive joining material 13.

  In other words, the plurality of fuel cells 3 have a flat portion, and the flat portion has the interconnector 11, the first cell facing portion 4a1 faces the interconnector 11, and the interconnector 11 The first cell facing portion 4a1 protrudes outward from both sides, and the portion of the interconnector 11 that protrudes outward from both sides of the first cell facing portion 4a1 extends from both sides of the first cell facing portion 4a1. The cell separation portion 4 a 2 is joined by the conductive joining material 13. Furthermore, the second cell facing portion 4b1 faces the air electrode layer 10 of the power generation unit, and the air electrode layer 10 is formed to protrude outward from both sides of the second cell facing portion 4b1. A second cell separation portion 4b2 extending from both sides of the second cell facing portion 4b1 is joined by a conductive bonding material 13 to a portion protruding outward from both sides of the two cell facing portion 4b1.

  In such a fuel cell device, between the fuel cell 3 and the first and second cell facing portions 4a1, 4b1 of the current collecting member 4, the first and second cell facing portions 4a1 of the current collecting member 4 are provided. 4b1 and the conductive bonding material 13 serve as a current path. Further, the first and second of the current collecting member 4 are also connected between the fuel cell 3 and the first and second cell separation portions 4a2, 4b2 of the current collecting member 4. Since the second cell separation portions 4a2, 4b2 and the conductive bonding material 13 serve as a current path, the current concentration in the current collecting member 4 is further reduced, the temperature rise of the current collecting member 4 is suppressed, and the electric resistance is increased. Can be suppressed, high current collection efficiency can be maintained, and the bonding strength between the fuel cell 3 and the current collection member 4 can be improved.

Further, in this embodiment, the air flows between the first and second cell facing portions 4a1 and 4b1 of the current collecting member 4 to the outside of the current collecting member 4 by the first and second cell separation portions 4a2 and 4b2. This can be suppressed, and air can be efficiently supplied to the air electrode layer 10 of the fuel cell 3.

  Next, a fuel cell module 20 in which the fuel cell device 1 is housed in the housing container 21 will be described with reference to FIG.

  A fuel cell module 20 shown in FIG. 8 includes a reformer 22 for reforming raw fuel such as natural gas or kerosene to generate fuel gas in order to obtain fuel gas used in the fuel cell 3. It is arranged above the cell stack 2. The fuel gas generated by the reformer 22 is supplied to the gas tank 6 through the gas flow pipe 23 and supplied to the gas flow path 12 provided inside the fuel battery cell 3 through the gas tank 6. .

  FIG. 8 shows a state where a part (front and rear surfaces) of the storage container 21 is removed and the fuel cell device 1 and the reformer 22 housed inside are taken out rearward. Here, in the fuel cell module 20 shown in FIG. 8, the fuel cell device 1 can be slid and stored in the storage container 21.

  Further, in FIG. 8, the oxygen-containing gas introduction member 24 provided inside the storage container 21 is disposed between the cell stacks 2 juxtaposed to the gas tank 6 and the oxygen-containing gas is adapted to the flow of the fuel gas. Thus, the oxygen-containing gas is supplied to the lower end side of the fuel cell 3 so that the fuel cell 3 flows from the lower end side toward the upper end side. The surplus fuel gas (fuel offgas) that has not been used for power generation discharged from the gas flow path 12 of the fuel cell 3 is burned above the fuel cell 3, thereby effectively increasing the temperature of the cell stack 2. And the start-up of the fuel cell device 1 can be accelerated. Further, the reformer 22 disposed above the cell stack 2 is burned above the fuel cell 3 by burning the fuel gas discharged from the gas flow path 12 of the fuel cell 3 and not used for power generation. Can be warmed. Thereby, the reforming reaction can be efficiently performed in the reformer 22.

  Next, a fuel cell device 25 in which the fuel cell module 20 and an auxiliary machine (not shown) for operating the fuel cell module 20 are housed in an outer case will be described with reference to FIG.

  The fuel cell device 25 shown in FIG. 9 has a module housing chamber 29 in which the inside of an exterior case made up of a support column 26 and an exterior plate 27 is vertically divided by a partition plate 28 and the upper side thereof houses the above-described fuel cell module 20. The lower side is configured as an auxiliary equipment storage chamber 30 for storing auxiliary equipment for operating the fuel cell module 20. In addition, the auxiliary machine accommodated in the auxiliary machine storage chamber 30 is abbreviate | omitted.

  Further, the partition plate 28 is provided with an air circulation port 31 for flowing the air in the auxiliary machine storage chamber 30 to the module storage chamber 29 side, and a part of the exterior plate 27 constituting the module storage chamber 29 An exhaust port 32 for exhausting air in the module storage chamber 29 is provided.

  Although the present invention has been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made without departing from the scope of the present invention.

For example, in the fuel cell device 1 described above, the fuel gas is supplied to the gas flow path 12 of the fuel battery cell 3 and the oxygen-containing gas is supplied to the outside of the fuel battery cell 3. The oxygen-containing gas may be supplied to 12 and the fuel gas may be supplied to the outside of the fuel cell 3. In that case, what is necessary is just to set it as the fuel cell 3 of the structure which makes an inner side electrode layer the air electrode layer 10, and makes an outer side electrode layer the fuel electrode layer 8. FIG. In this case, the bonding strength between the fuel electrode layer 8 as the outer electrode layer and the conductive bonding material 13 can be improved by setting the components of the conductive bonding material 13 to the same composition as that of the fuel electrode layer 8. .

  Furthermore, although the hollow flat plate fuel cell 3 is used in the above embodiment, a cylindrical fuel cell or a flat plate fuel cell can also be used.

  Moreover, in the said embodiment, although the fuel battery cell 3 which has the interconnector 11 was used, the fuel battery cell which does not have an interconnector can also be used.

  Furthermore, in the said form, although the current collection member 4 as shown in FIG. 3 was used, it is not limited to this. Although it has the 1st connection part 4c and the 2nd connection part 4d in FIG. 3, the case where it has any one connection part may be sufficient.

  Moreover, in the said form, as shown in FIG. 4, when the fuel cell 3 and the 1st cell separation part 4a2 of the current collection member 4 are joined by the electroconductive joining material 13, as shown in FIG. Although the case where the battery cell 3 and the first and second cell separation portions 4a2, 4b2 of the current collecting member 4 are joined by the conductive joining material 13 has been described, the fuel cell 3 and the second cell of the current collecting member 4 are described. Needless to say, even when the separation portion 4b2 is joined by the conductive joining material 13.

1: Fuel cell device 2: Cell stack 3: Fuel cell 4: Current collecting member 4a1: First cell facing portion 4b1: Second cell facing portion 4a2: First cell spacing portion 4b2: Second cell spacing portion 4c: 1st connection part 4d: 2nd connection part 6: Gas tank 11: Interconnector 13: Conductive joining material 20: Fuel cell module 25: Fuel cell apparatus

Claims (3)

A plurality of fuel cells;
A current collecting member that is arranged between the plurality of fuel cells and electrically connects the adjacent fuel cells, and
A fuel battery cell device in which the fuel cell and the current collecting member are joined with a conductive joining material,
First and second cell facing portions where the current collecting member faces each of the adjacent fuel cells; and
First and second cell separation portions extending from the first and second cell facing portions so as to be separated from the adjacent fuel cells,
The first and second cell spacing portions are connected to each other, and the connecting portion is configured.
The fuel cell and the first and second cell facing portions of the current collecting member are joined by the conductive joining material, and further, the fuel cell and the first and second cell separating portions of the current collecting member are joined. At least one is bonded with the conductive bonding material ,
The plurality of fuel cells have a flat portion, and the flat portion has a power generation unit configured by sandwiching a solid electrolyte between a pair of electrodes, and the second cell facing portion faces the power generation unit. The power generation part is formed to protrude outward from the second cell facing part, and a portion of the power generation part that protrudes outward from the second cell facing part extends from the second cell facing part. A fuel cell device, wherein a cell separation portion is joined by the conductive joining material .   The plurality of fuel cells have a flat portion, the flat portion has an interconnector, the first cell facing portion faces the interconnector, and the interconnector includes the first cell facing portion. A first cell separation portion extending from the first cell facing portion is joined to the portion of the interconnector protruding outward from the first cell facing portion of the interconnector by the conductive bonding material. The fuel cell device according to claim 1, wherein The conductive bonding material has a thickness that increases from the first cell-facing portion or the second cell-facing portion toward the outside, with a first inclination, and then a thickness that decreases with a second inclination. First slope
The fuel cell device according to claim 1 or 2, wherein the inclination angle is smaller than the second inclination .

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