JP5717573B2 - Cell stack and fuel cell module - Google Patents

Description

  The present invention relates to a cell stack and a fuel cell module in which a plurality of fuel cells are electrically connected using a current collecting member.

  In recent years, as a next-generation energy, a solid oxide fuel cell that generates 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.) is known. . A plurality of fuel cells are electrically connected in series via a current collecting member to form a cell stack (see, for example, Patent Document 1).

  Conventionally, in order to eliminate the temperature distribution in the vertical direction of the fuel cell, a cell stack is known in which the width of the upper end of the current collecting member is wider than the width of the lower end (see, for example, Patent Document 2).

JP 2005-339904 A JP 2009-158123 A

  However, in Patent Documents 1 and 2, since the upper and lower current collecting members are formed of the same material, the heat resistance is also the same. For example, as described in Patent Document 2, the width of the upper end part is set to the lower end part. When using a current collecting member wider than the width of the current collector, heat dissipation from a wide portion can be improved, but the heat resistance of the current collecting member is the same. There is a problem that the electrical conductivity of the current collecting member at the upper end becomes easily deteriorated with time. As a result, the current collection characteristics at the upper end portion are reduced, the current collection characteristics of the upper and lower current collection members are unbalanced, and there is a problem that the power generation performance of the entire cell stack is deteriorated over time.

  An object of this invention is to provide the cell stack and fuel cell module which can maintain high electric power generation performance.

The cell stack of the present invention includes a plurality of fuel cells arranged in a row, and a current collecting member that is disposed between the plurality of fuel cells and electrically connects the adjacent fuel cells. In addition, the current collecting member includes a first current collecting member and a second current collecting member having higher heat resistance than the first current collecting member, and the fuel cell is long. A gas passage is formed inside the fuel cell and in the length direction of the fuel cell, and the first current collecting member and the second current collecting member are arranged in the gas flow direction of the gas passage. Arranged in this order, an oxidation-resistant coating film is provided on the surface of the current collecting member, and the thickness of the coating film of the second current collecting member is the same as that of the coating film of the first current collecting member. It is characterized by being thicker than the thickness .
The cell stack of the present invention includes a plurality of fuel cells arranged in a row, and a current collecting member that is disposed between the plurality of fuel cells and electrically connects the adjacent fuel cells. In addition, the current collecting member includes a first current collecting member and a second current collecting member having higher heat resistance than the first current collecting member, and the fuel cell is long. A gas passage is formed inside the fuel cell and in the length direction of the fuel cell, and the first current collecting member and the second current collecting member are arranged in the gas flow direction of the gas passage. Arranged in this order, the current collecting member contains Cr, and the second current collecting member has a Cr content ratio higher than that of the first current collecting member.

  The fuel cell module of the present invention is obtained by storing the cell stack in a storage container.

According to the cell stack of the present invention, since the current collecting member includes the first current collecting member and the second current collecting member having higher heat resistance than the first current collecting member, for example, the fuel cell is long. A gas passage is formed in the fuel cell and in the length direction of the fuel cell, and the first current collecting member and the second current collecting member are arranged in the gas flow direction of the gas passage. Are arranged in this order, even if a temperature distribution occurs in the length direction of the fuel cell, the first current collecting member and the second current collector arranged in the length direction of the fuel cell over time. It can suppress that an imbalance arises in the current collection characteristic with an electric member.

The fuel cell stack apparatus is shown, (a) is an explanatory view schematically showing the fuel cell stack apparatus, and (b) is an enlarged cross-sectional view showing a part of (a). FIGS. 1A and 1B show the fuel cell shown in FIG. 1, in which FIG. 1A is a cross-sectional view, and FIG. 1B is a side view of the state where the interconnector of FIG. 1A and 1B show a current collecting member shown in FIG. 1, in which FIG. 1A is a perspective view, and FIG. 1B is a cross-sectional view taken along line BB in FIG. It is a cross-sectional view which shows the state which electrically connected a pair of fuel cell by the current collection member, (b) is sectional drawing along CC line of (a). It is explanatory drawing for demonstrating the arrangement | positioning state of the current collection member between a pair of fuel cell. It is a side view which shows the state which has arrange | positioned the 2nd current collection member in the center part of the arrangement direction of a fuel cell, and the 1st current collection member in the both sides of the arrangement direction. It is explanatory drawing which shows the state which lengthened the length of the 2nd current collection member toward the center part from the both sides of the sequence direction of a fuel cell. It is a perspective view which shows the fuel cell module of the state which took out the fuel cell stack apparatus from the 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 cell stack device 11 (hereinafter also referred to as a cell stack device 11) having a cell stack 12 will be described with reference to FIG. In addition, in FIG. 1-9, in order to understand easily, thickness, length, a width | variety, etc. may be shown expanded and reduced.

  The cell stack device 11 has a pair of opposing main surfaces. On one main surface of a long plate-like conductive support 17 as a whole, a fuel electrode 18 that is an inner electrode layer, and a solid The fuel cell unit 13 includes a solid oxide fuel cell 13 including a power generation unit in which an electrolyte 19 and an oxygen electrode 20 as an outer electrode layer are stacked in this order. Inside the conductive support 17, a plurality of gas flow paths 22 are formed penetrating in the length direction. The flow of gas flowing through the gas flow path 22 is indicated by arrows in FIG.

  The fuel cell 13 (hollow flat plate type) has a long columnar shape in which an interconnector 21 is laminated on the other main surface of the conductive support 17, and a plurality of these fuel cells 13 are arranged in a row. The current collecting member 14 is disposed between the adjacent fuel cells 13 and the fuel cells 13 are electrically connected in series to form the cell stack 12.

  The fuel cell 13 and the current collecting member 14 are joined via the conductive bonding material 23, whereby the plurality of fuel cells 13 are joined electrically and mechanically via the current collecting member 14. Thus, the cell stack 12 is configured.

  As understood from the shape shown in FIG. 2, the conductive support 17 includes a pair of flat surfaces n that are parallel to each other and arcuate surfaces (side surfaces) m that connect the pair of flat surfaces n. Has been. Both surfaces of the flat surface n are formed substantially parallel to each other, and a porous fuel electrode 18 is provided so as to cover one flat surface n (lower surface) and the arcuate surfaces m on both sides. A dense solid electrolyte 19 is laminated so as to cover 18. A porous oxygen electrode 20 is laminated on the solid electrolyte 19 so as to face the fuel electrode 18.

  In other words, the fuel electrode 18 and the solid electrolyte 19 are formed up to the other flat surface n (upper surface) via the arcuate surfaces m at both ends of the conductive support 17, and interconnectors are formed at both ends of the solid electrolyte 19. The both ends of 21 are joined, the electroconductive support body 17 is surrounded by the solid electrolyte 19 and the interconnector 21, and it is comprised so that the fuel gas which distribute | circulates the inside may not leak outside.

  And the lower end part of each fuel cell 13 which comprises the cell stack 12 is fixed to the gas tank 16 with sealing materials (not shown), such as glass, the cell stack apparatus 11 is comprised, and fuel gas is It is supplied to the fuel electrode 18 through a gas flow path 22 provided inside the fuel battery cell 13.

  In the cell stack device 11 shown in FIG. 1, a hydrogen-containing gas flows as a fuel gas in the gas flow path 22 of the fuel battery cell 13, and the inside of the current collecting member 14 disposed between the fuel battery cells 13 An oxygen-containing gas (air) flows. As a result, the fuel gas is supplied from the gas tank 16 to the fuel electrode 18, and the oxygen-containing gas is supplied to the oxygen electrode 20 through the inside of the current collecting member 14, thereby generating power in the fuel cell 13.

  The cell stack device 11 includes an elastically deformable conductive member 15 having a lower end fixed to a gas tank 16 so as to sandwich the cell stack 12 from both ends in the arrangement direction x of the fuel cells 13. Here, the conductive member 15 shown in FIG. 1 has a shape extending outward along the flat plate portion 15a and the arrangement direction x of the fuel cells 13 and is generated by power generation of the cell stack 12 (fuel cells 13). And a current extraction portion 15b for extracting an electric current.

Below, each member which comprises the fuel cell 13 is demonstrated. As the fuel electrode 18, a generally known one can be used, and porous conductive ceramics such as ZrO ₂ (referred to as stabilized zirconia) in which a rare earth element is dissolved, Ni and / or NiO, Can be formed from

The solid electrolyte 19 has a function as an electrolyte that bridges electrons between the electrodes, and at the same time, is required to have a gas barrier property in order to prevent leakage between the fuel gas and the oxygen-containing gas. It is formed from ZrO ₂ in which ₃ to 15 mol% of a rare earth element is dissolved. In addition, as long as it has the said characteristic, you may form using other materials, such as a lanthanum gallate.

The oxygen electrode 20 is not particularly limited as long as it is generally used. For example, the oxygen electrode 20 can be formed of a conductive ceramic made of a so-called ABO ₃ type perovskite oxide. The oxygen electrode 20 needs to have gas permeability, and can have an open porosity of 20% or more, particularly 30 to 50%. As the oxygen electrode 20, for example, lanthanum manganite (LaSrMnO ₃ ), lanthanum ferrite (LaSrFeO ₃ ), lanthanum cobaltite (LaSrCoO ₃ ) or the like in which Mn, Fe, Co, etc. exist at the B site can be used.

Although the interconnector 21 can be formed from conductive ceramics, it is required to have reduction resistance and oxidation resistance because it is 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 21 is dense in order to prevent leakage of the fuel gas flowing through the plurality of gas flow paths 22 formed in the conductive support 17 and the oxygen-containing gas flowing outside the conductive support 17. The relative density is preferably 93% or more, particularly 95% or more.

  The conductive support 17 is required to be gas permeable in order to allow the fuel gas to permeate to the fuel electrode 18 and to be conductive in order to collect current via the interconnector 21. . Therefore, it is necessary to use a material that satisfies this requirement as the conductive support member 17, and for example, conductive ceramics, cermets, and the like can be used.

  In the production of the fuel cell 13, in the case of producing the conductive support 17 by co-firing with the fuel electrode 18 or the solid electrolyte 19, the conductive support is composed of an iron group metal component and a specific rare earth oxide. 17 can be formed. The conductive support 17 preferably has an open porosity of 30% or more, particularly 35 to 50% in order to provide 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. The fuel battery cell 13 can also have the function of the fuel electrode 18 as a support without using the conductive support 17.

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 electronic conductivity than lanthanum chromite constituting the interconnector 21, 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 23 is provided for bonding the fuel cell 13 and the current collecting member 14 and can be formed using conductive ceramics or the like. As the conductive ceramic, the same ceramics that form the oxygen electrode 20 can be used.

Specifically, LaSrCoFeO ₃ , LaSrMnO ₃ , LaSrCoO ₃ or the like can be used. These materials may be manufactured using a single material, or the conductive bonding material 23 may be manufactured by combining two or more kinds.

  Next, the current collecting member 14 will be described with reference to FIG. The current collecting member 14 includes a plurality of plate-like first cell facing portions 14a1 joined to one adjacent fuel cell 13 and plates extending from both sides of the first cell facing portion 14a1 so as to be separated from the fuel cells. A first cell-like separation portion 14a2, a plurality of plate-like second cell facing portions 14b1 joined to the other adjacent fuel cell 13, and from both sides of the second cell facing portion 14b1 so as to be separated from the fuel cells. And an extended plate-like second separation portion 14b2.

  Further, the first connection portion 14c that connects one ends of the plurality of first separation portions 14a2 and the plurality of second separation portions 14b2, and the other ends of the plurality of first separation portions 14a2 and the plurality of second separation portions 14b2 The second connecting portion 14d to be connected is a set of units, and a plurality of sets of these units are connected in the length direction of the fuel cell 13 by conductive connecting pieces 14e. As shown in FIG. 4, the first cell facing portion 14 a 1 and the second cell facing portion 14 b 1 are portions that are joined to the fuel battery cell 13, and these portions are portions where the generated power of the fuel battery cell 13 is taken in and out. It has become.

  That is, the fuel cell 13 and the first cell facing portions 14 a 1 and 14 b 1 of the current collecting member 14 are joined by the conductive joining material 23. In other words, the plurality of fuel cells 13 have a flat portion, and the flat portion has the interconnector 21, and the first cell facing portion 14 a 1 faces the interconnector 21. Are joined by a conductive joining material 23. FIG. 4B is a longitudinal sectional view taken along line CC in FIG.

  In the fuel battery cell 13, as described above, a portion where the fuel electrode 18 and the oxygen electrode 20 face each other through the solid electrolyte 19 is a portion that generates power. Therefore, in order to efficiently collect the current generated by the power generation unit of the fuel cell 13, the length of the current collecting member 14 along the longitudinal direction of the fuel cell 13 is the length direction of the fuel cell 13. It is preferable that the length is equal to or greater than the length of the oxygen electrode layer 20.

  The current collecting member 14 needs to have heat resistance and conductivity, and can be made of a metal or an alloy. In particular, the current collecting member 14 can be made from an alloy containing Cr at a rate of 4 to 30% because it is exposed to a high-temperature oxidizing atmosphere, and can be made of an Fe—Cr alloy or Ni—Cr alloy. It can be made of an alloy or the like.

  Further, since the current collecting member 14 is exposed to a high-temperature oxidizing atmosphere, the surface of the current collecting member 14 may be provided with an oxidation resistant coating. Thereby, deterioration of the current collecting member 14 can be reduced. It is preferable to apply the oxidation resistant coating to the entire surface of the current collecting member 14. Thereby, it can suppress that the surface of the current collection member 14 is exposed to high temperature oxidation atmosphere.

  Here, the manufacturing method of the current collection member 14 is demonstrated. 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 project alternately by the site | part between the slit used as the 1st cell facing part 14a1, the 1st cell spacing part 14a2, the 2nd cell facing part 14b1, and the 2nd cell spacing part 14b2. 14 can be produced.

  In this embodiment, the current collecting member 14 includes a first current collecting member 45 and a second current collecting member 47 having higher heat resistance than the first current collecting member 45, as shown in FIG. As described above, the first current collecting member 45 is disposed at the lower end (gas tank 16 side) between the fuel cells, and the second current collecting member 47 is disposed at the upper end.

  Here, as a material for forming the current collecting member, the heat resistance is higher when the content ratio of Cr in the alloy used for the current collecting member is higher. In the case where the Cr content ratio is the same, the heat resistance is increased when a higher heat-resistant additive such as Ti, Mo, and Nb is included. On the other hand, even when the material of the current collecting member is the same, the heat resistance becomes high even when the oxidation-resistant coating film (the same material) is thick, or when the coating film with the high heat resistance (the same thickness) is formed. The heat resistance is the thickness of the chromium oxide layer formed when the current collecting member is exposed to the same temperature, and the heat resistance can be directly evaluated. The thinner the chromium oxide, the higher the heat resistance.

  Therefore, higher heat resistance than the first current collecting member 45 means that the content ratio of Cr is higher than that of the first current collecting member 45. When the Cr content ratio is the same, the addition of heat resistance is high. When the material of the current collecting member 14 is the same, it means that the thickness of the oxidation resistant coating film (the same material) is the first. It means that it is thicker than the current collecting member 45 and that a coating film (same thickness) having higher heat resistance than the first current collecting member 45 is formed.

  In the cell stack device 11 shown in FIG. 1, the first current collecting member 45 and the second current collecting member 47 have the same shape as shown in FIG. Are the same length, the Cr content of the current collecting member 14 is different, and only the heat resistance is different.

In other words, the plurality of fuel cells 13 are in the form of a long plate, and between the main surface of one fuel cell 13 and the main surface of the other fuel cell 13 adjacent to the one fuel cell 13. As shown in FIG. 5, the first current collecting member 45 and the second current collecting member 47 are arranged in this order from the lower side in the length direction of the fuel battery cell 13. That is, the main surface of one fuel battery cell 13 and the main surface of the other fuel battery cell 13 are arranged in parallel and face each other.

  In other words, the gas passage 12 is formed in the fuel cell 13 and in the length direction of the fuel cell 13, and the first current collecting member is arranged in the gas flow direction of the fuel gas flowing in the gas passage 12. 45 and the second current collecting member 47 are arranged in this order. The upper end of the first current collecting member 45 and the lower end of the second current collecting member 47 do not need to contact each other. In the drawing, the second current collecting member 47 is hatched for easy understanding.

  In such a cell stack 12, since the temperature at the upper part of the fuel cell 13 (downstream side in the fuel gas flow direction) becomes high, the current collecting member 14 at the upper part is likely to deteriorate. Since the first current collecting member 45 is arranged on the lower side in the length direction of the fuel battery cell 13 and the second current collecting member 47 having higher heat resistance than the first current collecting member 45 is arranged on the upper side, the second current collecting member on the upper side is arranged. Although the member 47 is exposed to a high temperature, since the second current collecting member 47 has higher heat resistance than the first current collecting member 45, the oxidation proceeds to the same degree, and the material deterioration proceeds in the same manner. It is possible to suppress the occurrence of an imbalance in current collection characteristics between the first current collecting member 45 and the second current collecting member 47 arranged in the length direction of 13 with time. Thereby, the power generation performance in the cell stack 12 can be maintained high.

  In the cell stack device 11 in which the fuel gas burns above the fuel battery cell 13, the temperature of the upper part of the fuel battery cell 13 is particularly high, and therefore this embodiment can be suitably used.

  In FIG. 1, the first current collecting member 45 and the second current collecting member 47 have the same length in the length direction of the fuel cell 13, but it is not necessary to have the same length. When the temperature difference between the upper part and the lower part is large, the length of the second current collecting member 47 may be shorter than that of the first current collecting member 45.

  In FIG. 1, the first current collecting member 45 and the second current collecting member 47 and two kinds of current collecting members are used. However, three or more kinds of current collecting members having different heat resistances can be used. In this case, finer control is possible.

  Further, for example, since the second current collecting member 47 is disposed in a portion having a high temperature, a member having a larger surface area than the first current collecting member 45 can be used in order to improve heat dissipation.

  Further, in FIG. 1, the fuel cell 13 is provided on the tank 16 so as to be vertically arranged in the length direction, but the cell stack is provided with the length direction of the fuel cell 13 being set horizontally. Also good.

  Furthermore, in the above-described embodiment, the cell stack 12 using the hollow flat plate fuel cell has been described. However, the disk-like fuel cell is stacked via the current collecting member, and the fuel gas is fed from the center of the fuel cell. The present invention can also be applied to a cell stack using flat fuel cells that flow toward the outer periphery. In this case, the current collecting member has a ring shape, and the ring-shaped second current collecting member is disposed so as to surround the ring-shaped first current collecting member.

  FIG. 6 shows another embodiment. In this embodiment, only the second current collecting member 47 is arranged at the center in the arrangement direction x of the fuel cells 13, and the first current collector is arranged on both sides in the arrangement direction x. Only the member 45 is arranged. The ratio between the central portion where only the second current collecting member 47 is arranged and the side portions where only the first current collecting member 45 is arranged can be appropriately set according to the temperature distribution of the cell stack 12, but in FIG. Is 1/3 of the stack length, and both sides are 1/3.

  Since the temperature of the cell stack 12 is likely to be higher at the center than at both sides in the arrangement direction x of the fuel cells 13, the first current collecting members 45 are provided at both sides in the arrangement direction x and the heat resistance is provided at the center. By disposing the highly current-collecting second current collecting member 47, an imbalance occurs over time in the current collecting characteristics of the first current collecting member 45 and the second current collecting member 47 in the arrangement direction x of the fuel cells 13. This can be suppressed and power generation performance can be maintained high.

  In the case of this embodiment, three or more current collecting members having different heat resistance can be used as in the above embodiment. In addition, the second current collecting member 47 may have a larger surface area than the first current collecting member 45 in order to improve heat dissipation. Further, a cell stack provided with the length direction of the fuel battery cell 13 in a horizontal direction may be used. Furthermore, even if it is a cell stack using a flat plate-like fuel cell, in which disk-like fuel cells are stacked via a current collecting member, and fuel gas flows from the center of the fuel cell toward the outer periphery. good.

  FIG. 7 shows still another form of the cell stack 12. In this form, in the form shown in FIG. 1, the second current collecting member 47 located at the center of the arrangement direction x of the fuel cells 13 is The length of the fuel cell 13 in the length direction is longer than that of the second current collecting members 45 located on both sides in the arrangement direction x.

  Specifically, the second current collecting member 47 is configured so that the length of the second current collecting member 47 gradually increases from both side portions in the arrangement direction x toward the central portion, and the aggregate of the second current collecting members 47 is an inverted triangle. In other words, in other words, the ratio of the second current collecting member 47 is increased so that the boundary between the first current collecting member 45 and the second current collecting member 47 is V-shaped.

  Since the temperature of such a cell stack 12 tends to be higher at the center than at both sides in the arrangement direction x of the fuel cells, and the temperature becomes higher in the fuel gas flow direction of the fuel cells, the arrangement direction By configuring the length of the second current collecting member 47 to gradually increase from both sides of the x toward the center, the first current collecting member 45 disposed in the length direction of the fuel cell 13 and the first current collecting member 45 are arranged. It is possible to further suppress the occurrence of imbalance in the current collection characteristics with the two current collection members 47 over time.

  In the case of this embodiment, three or more current collecting members having different heat resistance can be used as in the above embodiment. In addition, the second current collecting member 47 may have a larger surface area than the first current collecting member 45 in order to improve heat dissipation. Further, a cell stack provided with the length direction of the fuel battery cell 13 in a horizontal direction may be used. Furthermore, even if it is a cell stack using a flat plate-like fuel cell, in which disk-like fuel cells are stacked via a current collecting member, and fuel gas flows from the center of the fuel cell toward the outer periphery. good.

  Next, the fuel cell module 30 in which the cell stack 12 is stored in the storage container 31 will be described with reference to FIG.

  A fuel cell module 30 shown in FIG. 8 includes a reformer 32 for reforming raw fuel such as natural gas or kerosene to generate fuel gas to obtain fuel gas used in the fuel cell 13. It is arranged above the cell stack 12. The fuel gas generated by the reformer 32 is supplied to the gas tank 16 via the gas flow pipe 33 and supplied to the gas flow path 22 provided inside the fuel battery cell 13 via the gas tank 16. .

  FIG. 8 shows a state in which a part (front and rear surfaces) of the storage container 31 is removed and the cell stack device 11 and the reformer 32 housed inside are taken out rearward. Here, in the fuel cell module 30 shown in FIG. 8, the cell stack device 11 can be slid and stored in the storage container 31.

  Further, in FIG. 8, the oxygen-containing gas introduction member 34 provided inside the storage container 31 is disposed between the cell stacks 12 juxtaposed to the gas tank 16, 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 13 so that the fuel cell 13 flows laterally 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 22 of the fuel battery cell 13 is burned above the fuel battery cell 13, so that the temperature of the cell stack 12 is effectively increased. The cell stack device 11 can be started quickly. Further, the reformer 32 disposed above the cell stack 12 is burned above the fuel cell 13 by burning the fuel gas discharged from the gas flow path 12 of the fuel cell 13 and not used for power generation. Can be warmed. Thereby, the reforming reaction can be efficiently performed in the reformer 32.

  Next, a fuel cell device 35 in which a fuel cell module 30 and an auxiliary machine (not shown) for operating the fuel cell module 30 are housed in an outer case will be described with reference to FIG.

  The fuel cell device 35 shown in FIG. 9 has a module housing chamber in which an outer case made up of struts 36 and an outer plate 37 is vertically divided by a partition plate 38 and the upper side thereof stores the above-described fuel cell module 30. 39, the lower side is configured as an auxiliary equipment storage chamber 40 for storing auxiliary equipment for operating the fuel cell module 30. In addition, the description of the auxiliary machine accommodated in the auxiliary machine storage chamber 40 and the description of a part of the exterior plate 37 are omitted.

  In addition, the partition plate 38 is provided with an air circulation port 41 for allowing the air in the auxiliary machine storage chamber 40 to flow toward the module storage chamber 39, and a part of the exterior plate 37 constituting the module storage chamber 39, An exhaust port 42 for exhausting air in the module storage chamber 39 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 above embodiment, the hollow flat plate fuel cell 13 is used, but a cylindrical fuel cell and a flat plate fuel cell may be used.

  Moreover, in the said form, although the fuel cell 13 which has the interconnector 21 was used, the fuel cell which does not have an interconnector can also be used.

  Furthermore, in the said form, although the current collection member 14 as shown in FIG. 3 was used, it is not limited to this.

11: fuel cell stack device 12: cell stack 13: fuel cell 14: current collecting member 22: gas flow path 30: fuel cell module 31: storage container 35: fuel cell device 45: first current collecting member 47: first 2 Current collector

Claims (5)

A plurality of fuel cells arranged in a row; and a current collecting member that is arranged between the plurality of fuel cells and electrically connects the adjacent fuel cells, and the current collecting member And a first current collecting member and a second current collecting member having higher heat resistance than the first current collecting member ,
The fuel battery cell is elongated, and a gas passage is formed in the fuel battery cell and in a length direction of the fuel battery cell, and the first collection is arranged in the gas flow direction of the gas passage. The electric member and the second current collecting member are arranged in this order,
An oxidation-resistant coating film is provided on the surface of the current collecting member,
The cell stack according to claim 1, wherein a thickness of the coating film of the second current collecting member is larger than a thickness of the coating film of the first current collecting member . A plurality of fuel cells arranged in a row; and a current collecting member that is arranged between the plurality of fuel cells and electrically connects the adjacent fuel cells, and the current collecting member And a first current collecting member and a second current collecting member having higher heat resistance than the first current collecting member,
The fuel battery cell is elongated, and a gas passage is formed in the fuel battery cell and in a length direction of the fuel battery cell, and the first collection is arranged in the gas flow direction of the gas passage. The electric member and the second current collecting member are arranged in this order,
The current collecting member contains Cr;
  The cell stack, wherein the second current collecting member has a higher Cr content ratio than the first current collecting member. The said 1st current collection member and the said 2nd current collection member are arrange | positioned in this order in the gas flow direction of the fuel gas supplied to the said fuel cell, The Claim 1 or Claim 2 characterized by the above-mentioned. The cell stack described. The second current collecting member located at the center in the arrangement direction of the fuel cells is longer in the gas flow direction than the second current collecting members located on both sides in the arrangement direction of the fuel cells. The cell stack according to claim 1 , wherein the cell stack is long. Fuel cell module characterized by comprising accommodating the cell stack according to storage container to any one of claims 1 to 4.

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