JP5571758B2 - Flat fuel cell stack - Google Patents

Description

  The present invention relates to a flat plate type fuel cell stack in which a plurality of single stacks each composed of a flat plate type fuel cell and a housing member that houses the fuel cell are stacked.

  The stacked fuel cell is designed to make the fuel distribution uniform by forming orifices in the fuel supply passage and the air supply passage. Since the processing accuracy of the orifice greatly affects the gas distribution performance and the stack output, it must be manufactured with high accuracy (see Patent Document 1 and Non-Patent Document 1).

JP 2008-117736 A

M.Yokoo, K.Mizuki, K.Watanabe, K.Hayashi, “Development of a high power density 2.5kW class solid oxide fuel cell stack”, Journal of Power Sources 196, 2011, p.7937-7944

  As a conventional method for forming a fuel supply channel and an air supply channel of a fuel cell, there has been a method of forming a groove by etching in a plate-like member serving as a separator. However, such a forming method has a problem that the processing cost increases when an etching process with a high processing accuracy is used. In addition, when the processing accuracy is lowered, the cross-sectional area of the flow path varies from cell to cell, resulting in a non-uniform distribution of gas to each cell, resulting in a decrease in fuel cell stack performance.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a flat plate fuel cell stack capable of achieving both improvement in uniformity of gas distribution and reduction in processing cost.

The present invention relates to a flat plate fuel cell stack in which a plurality of single stacks each composed of a flat plate fuel cell and a housing member that accommodates the fuel cell are stacked. The fuel cell includes a fuel electrode and an air electrode as electrodes. A first plate that is disposed on an electrode side that is not a support electrode of the fuel electrode and the air electrode, and is disposed so as to face an electrode that is not a support electrode of the fuel cell. A second plate member laminated on the surface of the first plate member opposite to the surface facing the electrode that is not the support electrode, and the second plate member opposite to the first plate member A second plate-like member disposed on the support electrode side of the fuel electrode and the air electrode. , Arranged to face the support electrode of the fuel cell 4 plate-like members, a fifth plate-like member laminated on the surface of the fourth plate-like member opposite to the surface facing the support electrode, and the fourth plate facing the support electrode And a sixth plate member laminated on the surface of the member, the first plate member penetrating through the first plate member and a through hole forming a manifold formed at an end. The second plate-shaped member communicates with a through-hole forming a manifold formed at the end and one manifold for gas supply. A plurality of gas supply slits formed so as to penetrate the second plate member from a position to communicate with a gas supply hole of the first plate member; and the second plate member And a beam provided so as to separate each slit along the longitudinal direction of the plurality of slits The third plate member has a through hole forming a manifold formed at the end, and the fourth plate member has a through hole forming a manifold formed at the end. And a gas supply hole formed in the central portion so as to penetrate the fourth plate-shaped member, and the fifth plate-shaped member includes a through-hole constituting a manifold formed in the end portion. A gas supply slit formed so as to penetrate the fifth plate member from a position communicating with the gas supply manifold to a position communicating with the gas supply hole of the fourth plate member. The sixth plate-like member has a through-hole constituting a manifold formed at an end portion, and a through-hole for housing a fuel cell formed at a central portion, and the second plate By bringing the third plate-like member and the first plate-like member into close contact with each other above and below the shape member, The plurality of slits of the second plate member are configured as gas supply passages for supplying a single gas to the electrode that is not the support electrode, and the fourth plate member is disposed above and below the fifth plate member. And a slit of the fifth plate-like member is configured as a gas supply flow path for supplying gas to the support electrode by closely contacting the first accommodating member of the other single stack. is there.

Additionally, in an example of flat type fuel cell stack of the present invention, the fourth plate-like member, so as to penetrate the fourth plate-shaped member at a position outside the supporting electrode of the fuel cell further comprising a formed two gas recovery holes are, the fifth plate member, said fifth plate member to a position where the manifold communicating with the gas recovered from a position communicating with the gas recovery holes Two slits for gas recovery formed so as to penetrate therethrough are further provided, and the gases recovered from the two gas recovery holes are respectively guided to different gas recovery manifolds.
Additionally, in an example of flat type fuel cell stack of the present invention, the fourth plate-like member, so as to penetrate the fourth plate-shaped member at a position outside the supporting electrode of the fuel cell further comprising a formed two gas recovery holes are, the fifth plate member, said fifth plate member to a position where the manifold communicating with the gas recovered from a position communicating with the gas recovery holes Two slits for gas recovery formed so as to penetrate are further provided, and the gas recovered from the two gas recovery holes is guided to a common gas recovery manifold.
Further, in one configuration example of the flat plate fuel cell stack of the present invention, the fifth plate-shaped member includes a gas supply hole of the fourth plate-shaped member from a position communicating with one manifold for gas supply. A plurality of the gas supply slits formed so as to penetrate the fifth plate-like member to the communicating position, and further, the slits are divided along the longitudinal direction of the plurality of slits; A beam provided integrally with the fifth plate-like member, and the fourth plate-like member and the other single stack first receiving member are brought into close contact with each other above and below the fifth plate-like member Thus, the plurality of slits of the fifth plate-like member are configured as gas supply passages for supplying a single gas to the support electrode.

  According to the present invention, since the height of the slit (gas supply flow path) is determined by the thickness of the second plate-like member regardless of the processing accuracy, the difference in the cross-sectional area of the gas supply flow path for each cell is determined. It is possible to reduce the size of the gas supply flow path, and an inexpensive punching process can be used as a processing method for the gas supply flow path. Therefore, it is possible to form a gas supply flow path with high processing accuracy at a low cost. It is possible to achieve both improvement in uniformity of gas distribution and reduction in processing cost.

  Further, in the present invention, when a load is applied to the flat plate fuel cell stack, a beam integral with the second plate member is provided along the longitudinal direction of the slit to separate each slit. In addition, it is possible to prevent the upper and lower plates of the slit (gas supply flow path) from being bent and pushed out into the gas supply flow path, and to ensure the dimensional accuracy of the gas supply flow path.

1 is an exploded perspective view showing a configuration of a flat plate fuel cell stack according to a first embodiment of the present invention. It is a disassembled perspective view which shows the structure of the flat fuel cell stack which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the structure of the flat fuel cell stack which concerns on the 3rd Embodiment of this invention.

[Principle of the Invention]
In the present invention, the gas supply flow path for supplying gas to the fuel electrode or the air electrode of the fuel cell is composed of three metal plates that can be punched, thereby improving the uniformity of gas distribution and reducing the processing cost. Both.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing the configuration of a flat plate fuel cell stack according to the first embodiment of the present invention. The flat plate type fuel cell stack 1 according to the present embodiment includes a flat plate type fuel cell 2 having a circular shape in plan view, and a housing member that houses the fuel cell 2, and a plurality of these are provided as a set. It has a structure. The fuel cell 2 has a structure in which an electrolyte layer is sandwiched between an anode called an air electrode and a cathode called a fuel electrode. The fuel cell 2 includes a fuel electrode support type in which mechanical strength is ensured by the fuel electrode and an air electrode support type in which mechanical strength is ensured by the air electrode.

  The fuel cell 2 is housed in the housing member so as to be sandwiched between the housing member on the support electrode side and the housing member on the opposite side of the support electrode. At least a part of these housing members are electrically connected to each fuel cell 2 in a state where the fuel supplied to the fuel electrode side of each fuel cell 2 and the air supplied to the air electrode are not mixed. It functions as a separator.

  In the present embodiment, only the housing member opposite to the support electrode (upper side in FIG. 1) among the housing members that house the fuel cells 2 will be described. The accommodating member on the support electrode side will be described later. When the fuel cell 2 is a fuel electrode support type, since the fuel electrode is a support electrode, the storage member on the side opposite to the support electrode is a storage member facing the air electrode. When the fuel cell 2 is an air electrode support type, since the air electrode is a support electrode, the storage member on the side opposite to the support electrode is a storage member facing the fuel electrode.

  As shown in FIG. 1, the accommodating member on the opposite side to the support electrode is a flat plate gas mixing prevention plate 3 (third plate-like member) made of metal and having a rectangular shape in plan view, and an electrode opposite to the support electrode. A flat plate-shaped gas supply channel plate 4 (second plate member) made of metal and having a gas supply channel 6 (slit) for supplying gas, and an electrode opposite to the support electrode A gas supply hole 8 (first plate member) having a rectangular shape in a plan view made of metal and having a gas supply hole 8 for supplying gas to the center is formed. These plates are laminated on the electrode opposite to the supporting electrode of the fuel cell 2 in the order of the gas supply hole plate 5, the gas supply flow path plate 4, and the gas mixing prevention plate 3.

  At the four corners of each of the gas mixing prevention plate 3, the gas supply passage plate 4, and the gas supply hole plate 5, through holes 9a, 9b, which constitute manifolds for supplying gas to the electrode and collecting the gas, 9c and 9d are formed. Further, the gas supply flow path plate 4 passes through the gas supply flow path plate 4 from a position communicating with a through hole 9d constituting a gas supply manifold to a central position communicating with a gas supply hole 8 described later. A gas supply flow path 6 is formed. A gas supply hole 8 is formed in the gas supply hole plate 5 at a central position where the gas supply hole plate 5 communicates with the gas supply flow path 6 during stacking. These gas supply passage 6, gas supply hole 8, and through holes 9a, 9b, 9c, 9d are formed in advance by punching.

  The assembly procedure of a flat plate fuel cell using a single cell will be briefly described. After assembling a supporting electrode side accommodating member described later, the supporting electrode is placed on the supporting electrode side accommodating member. In this way, the fuel cell 2 is mounted, and the gas supply hole plate 5, the gas supply flow path plate 4, and the gas mixing prevention plate 3 are sequentially stacked on the fuel cell 2. Through holes 9a, 9b, 9c, and 9d formed in each plate are connected by stacking these plates, and manifolds are formed at the four corners of the housing member. Further, the gas supply channel 6 is sandwiched between the gas mixing prevention plate 3 and the gas supply hole plate 5. Thus, the assembly of a single stack of flat plate fuel cells is completed. In order to obtain a high power generation output, a single stack may be stacked, for example, 10 to 40 units.

  After assembling the flat plate fuel cell stack, the metal plates are diffusion-bonded at a high temperature of about 800 ° C. to ensure airtightness. In this embodiment, the gas supply hole plate 5 is directly mounted on the electrode opposite to the support electrode. However, the present invention is not limited to this, and the electrode on the opposite side of the support electrode and the gas supply hole are not limited thereto. A conductive plate having irregularities such as a heat-resistant net, a porous metal, and a corrugated plate may be inserted between the plate 5 and the plate 5.

  Next, the gas flow on the side opposite to the support electrode will be briefly described. The gas, which is either fuel or air, is supplied to the gas supply hole 8 of the gas supply hole plate 5 from the through hole 9d constituting the manifold for gas supply, through the gas supply flow path 6, and from the gas supply hole 8. It is supplied to the electrode opposite to the support electrode. When the fuel cell 2 is a fuel electrode support type, the gas supplied to the electrode (air electrode) opposite to the support electrode is air. On the other hand, when the fuel battery cell 2 is an air electrode support type, the gas supplied to the electrode (fuel electrode) opposite to the support electrode is a fuel gas.

  When the fuel cell 2 is an air electrode support type, the through hole 9d serves as a fuel supply manifold, and the gas supply flow path 6 serves as a fuel supply flow path. In this case, the ratio of the cross-sectional area of the gas supply flow path 6 to the cross-sectional area of the through-hole 9d constituting the fuel supply manifold (hereinafter referred to as the first ratio) is 0.015. It is set to 0.05 or more and desirably 0.015 or more and 0.02 or less. In addition, the cross-sectional area of the gas supply flow path 6 means an area perpendicular to the gas flow direction in the flow path (the direction from the near side to the back side in the example of FIG. 1). Moreover, the cross-sectional area of the manifold means an area in a direction perpendicular to the gas flow direction (vertical direction in FIG. 1) in the manifold. By setting the first ratio to 0.015 or more and 0.05 or less, preferably 0.015 or more and 0.02 or less, the fuel is uniformly distributed to each fuel cell 2 while suppressing the pressure loss of the fuel. As a result, the performance of the flat plate fuel cell stack can be improved.

  On the other hand, when the fuel cell 2 is a fuel electrode support type, the through hole 9d serves as an air supply manifold, and the gas supply channel 6 serves as an air supply channel. In this case, the gas supply flow path 6 has a ratio of the cross-sectional area of the gas supply flow path 6 to the cross-sectional area of the through hole 9d constituting the manifold for air supply (hereinafter referred to as the second ratio) is 0.03. It is set to 0.10 or more and desirably 0.04 or more and 0.06 or less. By setting the second ratio to 0.03 or more and 0.10 or less, preferably 0.04 or more and 0.06 or less, air is uniformly distributed to each fuel cell 2 while suppressing air pressure loss. As a result, the performance of the flat plate fuel cell stack can be improved.

  The above first ratio and second ratio are disclosed in Patent Document 1. In the present embodiment, when the fuel cell 2 is an air electrode support type, the width of the gas supply channel 6 (dimension in the direction perpendicular to the gas flow direction) so that the first ratio falls within the above range. The thickness of the gas supply flow path plate 4 may be selected as appropriate. When the fuel cell 2 is a fuel electrode support type, the width of the gas supply flow path 6 and the thickness of the gas supply flow path plate 4 may be appropriately selected so that the second ratio is in the above range.

  As described above, in the present embodiment, the height of the gas supply flow path 6 is determined by the thickness of the gas supply flow path plate 4 regardless of the processing accuracy. It becomes possible to reduce the difference in area, and an inexpensive punching process can be used as a processing method of the gas supply flow path 6, so that the gas supply flow path 6 with high processing accuracy can be formed at low cost. Thus, it is possible to achieve both improvement in the uniformity of gas distribution to each fuel cell 2 and reduction in processing costs.

  When the flow rate of the gas supplied to the electrode opposite to the support electrode is large and the output of the blower (that is, the pressure head) is desired to be lowered, the width of the gas supply flow path 6 formed in the gas supply flow path plate 4 is reduced. A method of increasing the size can be considered. At this time, when it is desired to provide the gas supply flow path 6 having a width of 10 mm or more, the gas supply flow path 6 is divided into a plurality of parts as shown in FIG. 6 may be provided along the longitudinal direction of 6 (in the example of FIG. 1, the direction from the front to the back) to divide the supply channels 6. By providing such a beam 7, when a load is applied to the fuel cell stack, the gas mixing prevention plate 3 and the gas supply hole plate 5 above and below the gas supply channel 6 bend and the gas supply channel 6. Can be prevented from being pushed out into the interior of the chamber, and the dimensional accuracy of the orifice (gas supply flow path 6) during assembly can be ensured.

  When the width of the gas supply channel 6 is 10 mm or less, it is not necessary to provide the beam 7. When the total width of the gas supply channels 6 exceeds 10 mm and is less than 20 mm, two gas supply channels 6 having a width of 10 mm or less are formed, and the two gas supply channels 6 are interposed between the two gas supply channels 6. One beam 7 may be provided. When the total width of the gas supply channels 6 is 20 mm or more, the number of beams 7 may be increased so that the width of each gas supply channel 6 does not exceed 10 mm. The minimum width of the beam 7 is determined by the width that can be punched, and the maximum width of the beam 7 is determined by the required width of the gas supply channel 6.

  Although not shown in FIG. 1, a flow path for collecting gas from the electrode opposite to the support electrode may be formed in the gas supply flow path plate 4 in the same manner as the gas supply flow path 6.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 2 is an exploded perspective view showing the structure of a flat plate fuel cell stack according to the second embodiment of the present invention. In the present embodiment, only the housing member on the support electrode side (the lower side in FIG. 2) among the housing members that house the fuel cells 2 will be described. The accommodating member on the side opposite to the support electrode is as described in the first embodiment. When the fuel cell 2 is a fuel electrode support type, the support member on the support electrode side is a storage member facing the fuel electrode. When the fuel cell 2 is an air electrode support type, the support member on the support electrode side is a storage member that faces the air electrode.

  As shown in FIG. 2, the support member on the support electrode side is a planar cell storage plate 10 (fourth plate member) made of metal and having a rectangular shape in plan view, and a gas supply hole 14 for supplying gas to the support electrode. Is a flat plate-shaped gas supply hole plate 11 (first plate-like member) made of metal and provided in the center, a gas supply channel 16 (slit) for supplying gas to the support electrode, and gas The gas recovery channel 17 (slit) for recovering the gas is formed from a flat plate-shaped gas supply / recovery channel plate 12 (second plate member) made of metal and having a rectangular shape in plan view. These plates are laminated in the order of the gas supply / recovery flow path plate 12, the gas supply hole plate 11, and the cell storage plate 10.

  Similar to the housing member on the side opposite to the support electrode, through holes 9 a, 9 b, 9 c, which constitute a manifold, are provided at the four corners of the cell storage plate 10, the gas supply hole plate 11, and the gas supply / recovery flow path plate 12. 9d is formed. The cell storage plate 10 is formed with a through hole 13 having a circular shape in plan view, for example, for cell storage at the center thereof. The thickness of the cell storage plate 10 is set to be the same as the thickness of the fuel cell 2 or slightly thicker than the fuel cell 2. When the fuel cell 2 is directly mounted on the gas supply hole plate 11, the thickness of the cell storage plate 10 may be the same as that of the fuel cell 2. The diameter of the through hole 13 is set to be slightly larger than the outer diameter of the fuel cell 2, and the fuel cell 2 is disposed in the through hole 13.

  In the gas supply hole plate 11, a gas supply hole 14 is formed at a central position, and a gas recovery hole 15 is formed at a position communicating with the through hole 13 when the stack is stacked. The gas supply / recovery flow path plate 12 penetrates the gas supply / recovery flow path plate 12 from a position communicating with the through hole 9b constituting the gas supply manifold to a central position communicating with the gas supply hole 14. Gas supply passage 16 is formed, and further passes through the gas supply / recovery passage plate 12 from a position communicating with the through holes 9a, 9c constituting the manifold for gas recovery to a position communicating with the gas recovery hole 15. A gas recovery channel 17 is formed. These through holes 9a, 9b, 9c and 9d, the through hole 13, the gas supply hole 14, the gas recovery hole 15, the gas supply channel 16 and the gas recovery channel 17 are formed in advance by punching.

  The assembly procedure of the flat plate fuel cell using one cell will be briefly described. After the gas supply / recovery flow path plate 12, the gas supply hole plate 11, and the cell storage plate 10 are stacked in this order, the cell storage plate 10 The fuel cell 2 is accommodated in the through hole 13 with the support electrode facing down, and the gas supply hole plate 5 described in the first embodiment, the gas supply flow is provided on the fuel cell 2. The road plate 4 and the gas mixing prevention plate 3 are laminated in order. Thus, the assembly of a single stack of flat plate fuel cells is completed. As described in the first embodiment, in order to obtain a high power generation output, for example, 10 to 40 units may be stacked as a single stack. In this case, the gas supply channel 16 and the gas recovery channel 17 are sandwiched between the gas supply hole plate 11 and the other single stack gas mixing prevention plate 3.

  After assembling the flat plate fuel cell stack, the metal plates are diffusion-bonded at a high temperature of about 800 ° C. to ensure airtightness. In the present embodiment, the fuel cell 2 is directly mounted on the gas supply hole plate 11, but the present invention is not limited to this, and the support electrode of the fuel cell 2 and the gas supply hole plate 11 A conductive plate having irregularities such as a heat-resistant net, a porous metal, and a corrugated plate may be inserted therebetween.

  Next, the gas flow on the support electrode side will be briefly described. The gas, which is either fuel or air, is supplied to the gas supply hole 14 of the gas supply hole plate 11 from the through hole 9b constituting the gas supply manifold through the gas supply flow path 16, and from the gas supply hole 14. Supplied to the support electrode. The used gas passes from the gas recovery hole 15 of the gas supply hole plate 11 through the gas recovery flow path 17 of the gas supply / recovery flow path plate 12 to the through holes 9a, 9c constituting the manifold for gas recovery. Are discharged and discharged from these manifolds to the outside. As described above, the diameter of the through hole 13 is set to be slightly larger than the outer diameter of the fuel cell 2. More specifically, the position of the end of the through hole 13, specifically the outer periphery of the fuel cell 2. A gas recovery hole 15 is provided at a slightly outer position. When the fuel cell 2 is a fuel electrode support type, the gas supplied to the support electrode (fuel electrode) is a fuel gas. On the other hand, when the fuel cell 2 is an air electrode support type, the gas supplied to the support electrode (air electrode) is air.

  When the fuel cell 2 is a fuel electrode support type, the through hole 9b serves as a fuel supply manifold, and the gas supply channel 16 serves as a fuel supply channel. In this case, the first ratio of the gas supply channel 16 is set to 0.015 or more and 0.05 or less, desirably 0.015 or more and 0.02 or less. On the other hand, when the fuel cell 2 is an air electrode support type, the through hole 9b serves as an air supply manifold, and the gas supply channel 16 serves as an air supply channel. In this case, the second ratio of the gas supply channel 16 is set to 0.03 or more and 0.10 or less, and preferably 0.04 or more and 0.06 or less.

  In the present embodiment, when the fuel cell 2 is a fuel electrode support type, the width of the gas supply channel 16 (dimension in the direction perpendicular to the gas flow direction) so that the first ratio falls within the above range. The thickness of the gas supply / recovery flow path plate 12 may be selected as appropriate. Further, when the fuel cell 2 is an air electrode support type, the width of the gas supply channel 16 and the thickness of the gas supply / recovery channel plate 12 are appropriately selected so that the second ratio is in the above range. Good.

  As described above, in the present embodiment, the height of the gas supply flow path 16 is determined by the thickness of the gas supply / recovery flow path plate 12 regardless of the processing accuracy. It is possible to reduce the difference in the cross-sectional area of the gas, and it is possible to use an inexpensive punching process as a processing method of the gas supply channel 16, so that the gas supply channel 16 with high processing accuracy can be formed at a low cost. Therefore, it is possible to achieve both improvement in the uniformity of gas distribution to each fuel cell 2 and reduction in processing costs.

  When it is desired to provide the gas supply flow path 16 having a width of 10 mm or more, the gas supply flow path 16 is divided into a plurality of parts in the same manner as in the first embodiment, and beams integrated with the gas supply / recovery flow path plate 12 are provided. What is necessary is just to provide between the supply flow paths 16.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. FIG. 3 is an exploded perspective view showing the structure of a flat plate fuel cell stack according to the third embodiment of the present invention. In the present embodiment, only the housing member on the support electrode side (the lower side in FIG. 3) among the housing members that house the fuel cells 2 will be described. The accommodating member on the side opposite to the support electrode is as described in the first embodiment.

  As shown in FIG. 2, the storage member on the support electrode side is a plan view made of metal in which a cell storage plate 10, a gas supply hole plate 11, a gas supply channel 16 and a gas recovery channel 17a are formed. The gas supply / recovery flow path plate 12a (second plate member) is a rectangular flat plate type. These plates are laminated in the order of the gas supply / recovery flow path plate 12a, the gas supply hole plate 11, and the cell storage plate 10.

  The cell storage plate 10 and the gas supply hole plate 11 are as described in the second embodiment. Similar to the housing member on the side opposite to the support electrode, through holes 9a, 9b, 9c, and 9d constituting the manifold are formed at the four corners of the gas supply / recovery flow path plate 12a. Further, the gas supply / recovery flow path plate 12a has a gas supply / recovery flow path plate 12a from a position communicating with the through hole 9b constituting the gas supply manifold to a central position communicating with the gas supply hole 14. A gas supply / recovery flow path plate 12a is formed from a position communicating with the through hole 9d constituting the manifold for gas recovery to a position communicating with the gas recovery hole 15. A gas recovery flow path 17a (slit) penetrating therethrough is formed. These through holes 9a, 9b, 9c, 9d, the gas supply channel 16 and the gas recovery channel 17a are formed in advance by punching.

  The assembly procedure of the flat plate fuel cell using one cell will be briefly described. After the gas supply / recovery flow path plate 12a, the gas supply hole plate 11, and the cell storage plate 10 are stacked in this order, the cell storage plate 10 The fuel cell 2 is accommodated in the through hole 13 with the support electrode facing down, and the gas supply hole plate 5 described in the first embodiment, the gas supply flow is provided on the fuel cell 2. The road plate 4 and the gas mixing prevention plate 3 are laminated in order. Thus, the assembly of a single stack of flat plate fuel cells is completed. As described in the first embodiment, in order to obtain a high power generation output, for example, 10 to 40 units may be stacked as a single stack. In this case, the gas supply channel 16 and the gas recovery channel 17a are sandwiched between the gas supply hole plate 11 and the other single stack gas mixing prevention plate 3.

  After assembling the flat plate fuel cell stack, the metal plates are diffusion-bonded at a high temperature of about 800 ° C. to ensure airtightness. As described in the second embodiment, a conductive plate having irregularities such as a heat-resistant net, a porous metal, and a corrugated plate is provided between the support electrode of the fuel cell 2 and the gas supply hole plate 11. It may be inserted.

  The gas, which is either fuel or air, is supplied to the gas supply hole 14 of the gas supply hole plate 11 from the through hole 9b constituting the gas supply manifold through the gas supply flow path 16, and from the gas supply hole 14. Supplied to the support electrode. Then, the used gas is discharged from the gas recovery hole 15 of the gas supply hole plate 11 through the gas recovery flow path 17a of the gas supply / recovery flow path plate 12a to the through hole 9d constituting the manifold for gas recovery. , Discharged from this manifold to the outside. When the fuel cell 2 is a fuel electrode support type, the gas supplied to the support electrode (fuel electrode) is a fuel gas. On the other hand, when the fuel cell 2 is an air electrode support type, the gas supplied to the support electrode (air electrode) is air. What is necessary is just to set the 1st ratio or 2nd ratio of the gas supply flow path 16 so that it may become the range demonstrated in 1st, 2nd embodiment.

  Thus, in this embodiment, the same effect as in the second embodiment can be obtained. In the present embodiment, since the used gas is guided to one through hole 9d using the two gas recovery passages 17a communicating with the two gas recovery holes 15 when stacking the stack, the gas in the vicinity of the cell The number of manifolds for gas recovery can be reduced while securing the flow of gas.

  The present invention can be applied to a flat plate fuel cell.

  DESCRIPTION OF SYMBOLS 1 ... Flat type fuel cell stack, 2 ... Fuel cell, 3 ... Gas mixing prevention plate, 4 ... Gas supply flow path plate, 5,11 ... Gas supply hole plate, 6, 16 ... Gas supply flow path, 7 ... Beam 8, 14 ... gas supply holes, 9a to 9d, 13 ... through holes, 10 ... cell storage plate, 12, 12a ... gas supply / recovery flow path plate, 15 ... gas recovery hole, 17, 17a ... gas recovery flow path .

Claims (4)

In the flat plate type fuel cell stack in which a plurality of single stacks each composed of a flat plate type fuel cell and a housing member that houses the fuel cell are stacked,
The fuel cell has a fuel electrode and an air electrode as electrodes,
A first plate member disposed on the fuel electrode and the air electrode on the electrode side that is not a support electrode; and a first plate member disposed so as to face an electrode that is not a support electrode of the fuel cell; A second plate member laminated on the surface of the first plate member opposite to the surface facing the non-support electrode, and the second plate opposite to the first plate member. Including a third plate member serving as a gas mixing prevention plate laminated on the surface of the member,
Of the fuel electrode and the air electrode, the second housing member disposed on the support electrode side includes a fourth plate-shaped member disposed to face the support electrode of the fuel cell, the support electrode, A fifth plate member laminated on the surface of the fourth plate member opposite to the opposite surface, and a sixth plate laminated on the surface of the fourth plate member opposed to the support electrode. Including a plate-like member,
The first plate-like member has a through-hole constituting a manifold formed at an end portion, and a gas supply hole formed in a central portion so as to penetrate the first plate-like member,
The second plate-like member communicates with a gas supply hole of the first plate-like member from a through hole that forms a manifold formed at an end portion and a position that communicates with one manifold for gas supply. A plurality of gas supply slits formed so as to penetrate the second plate-like member to a position , and between the slits along the longitudinal direction of the plurality of slits integrally with the second plate-like member And a beam provided to divide
The third plate-like member has a through-hole constituting a manifold formed at an end,
The fourth plate-like member has a through hole that forms a manifold formed at an end portion, and a gas supply hole that is formed in the center so as to penetrate the fourth plate-like member,
The fifth plate-like member has a through-hole forming a manifold formed at an end, and a position communicating with the manifold for gas supply to a position communicating with the gas supply hole of the fourth plate-like member. A gas supply slit formed so as to penetrate the fifth plate-shaped member,
The sixth plate-shaped member has a through-hole constituting a manifold formed at an end portion, and a through-hole for storing a fuel cell formed at a central portion,
By bringing the third plate-like member and the first plate-like member into close contact with each other above and below the second plate-like member, a plurality of slits of the second plate-like member are formed as electrodes that are not the support electrodes. Configure as a gas supply channel to supply a single gas,
The fourth plate member and another single stack first housing member are brought into close contact with the upper and lower sides of the fifth plate member so that the slits of the fifth plate member are gas-filled to the support electrode. A flat plate fuel cell stack, characterized in that it is configured as a gas supply flow path for supplying gas . The flat plate fuel cell stack according to claim 1 ,
The fourth plate-like member further has two gas recovery holes formed so as to penetrate the fourth plate-like member at a position outside the support electrode of the fuel cell.
The fifth plate-like member has two gas recovery holes formed so as to penetrate the fifth plate-like member from a position communicating with the gas recovery hole to a position communicating with the manifold for gas recovery. Further having a slit,
A flat plate fuel cell stack, wherein the gas recovered from the two gas recovery holes is guided to a separate gas recovery manifold. The flat plate fuel cell stack according to claim 1 ,
The fourth plate-like member further has two gas recovery holes formed so as to penetrate the fourth plate-like member at a position outside the support electrode of the fuel cell.
The fifth plate-like member has two gas recovery holes formed so as to penetrate the fifth plate-like member from a position communicating with the gas recovery hole to a position communicating with the manifold for gas recovery. Further having a slit,
A flat plate fuel cell stack, wherein the gas recovered from the two gas recovery holes is guided to a common gas recovery manifold. The flat plate fuel cell stack according to claim 1 ,
The fifth plate-shaped member penetrates the fifth plate-shaped member from a position communicating with one manifold for gas supply to a position communicating with a gas supply hole of the fourth plate-shaped member. A plurality of slits for gas supply formed, and a beam provided integrally with the fifth plate member so as to divide the slits along the longitudinal direction of the plurality of slits. ,
The plurality of slits of the fifth plate-like member are formed on the support electrode by bringing the fourth plate-like member into close contact with the first accommodating member of another single stack above and below the fifth plate-like member. A flat plate fuel cell stack, characterized in that it is configured as a gas supply channel for supplying a single gas .

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