JP2017139186A - Fuel battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel battery that is able to improve uniformity of a reaction between a reaction fluid and an air electrode or a fuel electrode.SOLUTION: If unit areas SA1, SA2 or a unit width p, including both at least circulation parts 52, 54 and projecting parts 50, 51, is set for reaction regions 53, 55, the reaction regions 53, 55 have regions WA1, WA2, in which the proportions of the projecting parts 50, 51 per unit areas SA1, SA2 or unit width p is constant at each position in a planar direction. Thus, even if the arrangement patterns of the projecting parts 50, 51 differ according to positions in planar directions in the reaction regions 53, 55, the proportions of the areas occupied by the projecting parts 50, 51 can be made constant in each position in the planar directions of the reaction regions 53, 55. Accordingly, regardless of the positions of the reaction regions 53, 55 in the planar directions, the proportions of the areas of the circulation parts 52, 54, where a reaction fluid flows along a fuel electrode 13 or an air electrode 14, can also be made constant.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel cell.

  As a conventional fuel cell, for example, a technique described in Patent Document 1 is known. The fuel cell described in Patent Document 1 includes a cell body configured by laminating an air electrode, a solid electrolyte body, and a fuel electrode, and an interconnector disposed so as to sandwich the cell body. A plurality of protrusions are arranged in a flow path for supplying air to the air electrode of the cell body and a flow path for supplying fuel to the fuel electrode. The fluid is diffused in the flow path by the plurality of projections.

JP 2010-129299 A

  In the case where the protrusions are provided uniformly, the reaction fluid is biased by the bias of the flow of the reaction fluid with respect to the air electrode or the fuel electrode. Therefore, in the above-described prior art, the unevenness of the reaction fluid is eliminated by providing a plurality of protrusions in the flow path. Here, at the position where the protrusion is provided, no reaction occurs because the reaction fluid does not flow along the air electrode or the fuel electrode. Therefore, in the above-described prior art, the reaction between the reaction fluid and the air electrode or the fuel electrode is biased due to the density of the protrusions at the positions in the flow path. Therefore, on the premise of eliminating the uneven flow of the reaction fluid itself, there has been a demand for further improving the uniformity of the reaction between the reaction fluid and the air electrode or the fuel electrode.

  An object of the present invention is to provide a fuel cell capable of improving the uniformity of reaction between a reaction fluid and an air electrode or a fuel electrode.

  A fuel cell according to an aspect of the present invention includes a cell main body that has a fuel electrode disposed on one side of an electrolyte and an air electrode disposed on the other side of the electrolyte, and that causes a power generation reaction between the fuel and air. An interconnector having a flow path forming portion that is laminated so as to sandwich the main body from the fuel electrode side or the air electrode side, and in the stacking direction is opposed to the fuel electrode or the air electrode and allows the fuel or air that is a reaction fluid to flow. The flow path forming portion is arranged in a flow passage portion along which the reaction fluid flows along the fuel electrode or the air electrode, and in a plane direction extending in the stacking direction and orthogonal to the stacking direction. A reaction area having protrusions, and the arrangement pattern of the protrusions differs depending on the position in the planar direction in the reaction area, and the unit area including at least both the flow part and the protrusions with respect to the reaction area Or set unit width If, the reaction zone, the proportion of the protrusions per unit area or unit width has an area becomes constant at each position in the planar direction.

  In the fuel cell as described above, when a unit area or unit width including at least both the flow part and the protrusion is set for the reaction region, the reaction region is a ratio of the protrusion per unit area or unit width. However, it has the area | region which becomes fixed in each position in a plane direction. Thereby, even if the arrangement pattern of the protrusions varies depending on the position in the planar direction in the reaction region, the ratio of the protrusions (area or width) can be made constant at each position in the planar direction of the reaction region. it can. Thereby, the ratio of the flow part through which the reaction fluid flows along the fuel electrode or the air electrode can be made constant regardless of the position of the reaction region in the planar direction. Therefore, it is possible to reduce the deviation due to the position in the planar direction of the reaction between the reaction fluid and the air electrode or the fuel electrode, and to improve the uniformity of the reaction between the reaction fluid and the air electrode or the fuel electrode.

  The ratio per unit area or unit width in the reaction region on the fuel electrode side and the ratio per unit area or unit width in the reaction region on the air electrode side may be constant. Thus, by making the ratio per unit area or unit width constant for both the fuel electrode side and the air electrode, it is possible to suppress an excess of the reaction fluid for either the fuel electrode or the air electrode.

  When the ratio of the protrusions per unit area or unit width at each position in the planar direction is within 10% of the error from the predetermined ratio, the ratio may be constant. Thereby, it can be considered that it is constant when the proportion of the protrusions per unit area or unit width changes within the error range.

  ADVANTAGE OF THE INVENTION According to this invention, the fuel cell which can improve the uniformity of reaction with a reaction fluid, an air electrode, or a fuel electrode is provided.

It is a perspective view showing the appearance of the fuel cell concerning one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line A2-A2 and a cross-sectional view taken along line B2-B2 of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a figure for demonstrating a unit area and a unit width. It is a figure which shows the reaction area | region of the fuel cell which concerns on a comparative example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing the appearance of a fuel cell according to an embodiment of the present invention. In FIG. 1, a fuel cell 1 of this embodiment is a solid oxide fuel cell (SOFC), and generates electricity by chemically reacting hydrogen in fuel and oxygen in air.

  The fuel cell 1 includes a stack 2 and end plates 3A and 3B arranged so as to sandwich the stack 2 in the vertical direction. An insulating plate 4 is disposed between the stack 2 and the end plates 3A and 3B. The end plates 3A and 3B and the insulating plate 4 have a square shape in plan view. The stack 2 and the end plates 3A and 3B are fixed by four bolts 5.

  In the upper end plate 3A, a fuel introduction pipe 6 for introducing fuel into the stack 2, a fuel lead-out pipe 7 for extracting fuel from the stack 2, and air for introducing air into the stack 2 An air introduction pipe 8 and an air lead-out pipe 9 for leading air out of the stack 2 are attached. The fuel introduction pipe 6 and the fuel lead-out pipe 7 are attached to the central portion of the end plate 3A in the vicinity of two opposing edges. The air introduction pipe 8 and the air lead-out pipe 9 are attached to the central part of the end plate 3A near the other two opposite edges.

  2A is a cross-sectional view taken along line A2-A2 in FIG. 1, and FIG. 2B is a cross-sectional view taken along line B2-B2 in FIG. In FIGS. 2A and 2B, the end plates 3A and 3B and the insulating plate 4 are omitted.

  In FIG. 2, the stack 2 has a structure in which a plurality of cell bodies 10 and interconnectors 11 are alternately stacked. The uppermost layer and the lowermost layer of the stack 2 are interconnectors 11. In the following description, the description may be based on the XYZ axes. Here, the Z-axis direction corresponds to the stacking direction of the stack 2.

  The cell body 10 is disposed between two interconnectors 11 adjacent in the stacking direction. The cell body 10 includes an electrolyte 12, a fuel electrode (anode) 13 disposed on the lower surface side of the electrolyte 12, and an air electrode (cathode) 14 disposed on the upper surface side of the electrolyte 12. The cell main body 10 generates and reacts fuel and air.

  The interconnector 11 is disposed so as to sandwich the cell body 10 from the fuel electrode 13 side and the air electrode 14 side. The interconnector 11 has a fuel flow path forming part (flow path forming part) 15 facing the fuel electrode 13 and an air flow path forming part (flow path forming part) 16 facing the air electrode 14. The fuel flow path forming unit 15 forms a flow path for supplying fuel to the fuel electrode 13. The air flow path forming unit 16 forms a flow path for supplying air to the air electrode 14.

  The fuel flow path forming portion 15 and the air flow path forming portion 16 have a structure in which, for example, a plurality of columnar or wall-shaped protrusions 50 and 51 are provided. The protrusions 50 and 51 may be integrally formed with the interconnector 11 by pressing or the like, or may be formed by interposing a member that forms the flow path. At this time, the space between the protrusions 50 and 51 serves as a flow path for flowing fuel and air. The detailed configuration of the protrusions 50 and 51 will be described later.

  A pair of columnar members 40 and a pair of columnar members 41 are arranged around the cell body 10 between two interconnectors 11 adjacent in the stacking direction so as to surround the cell body 10. Each columnar member 40 is disposed so as to face the cell body 10. Each columnar member 41 is disposed so as to face the cell body 10 in a direction perpendicular to the facing direction of each columnar member 40.

  Each of the columnar members 40 and 41 has an annular shape. The columnar members 40 and 41 are members that connect two adjacent interconnectors 11 so as not to mix fuel and air, and electrically insulate the two adjacent interconnectors 11 from each other. The columnar members 40 and 41 are made of a material having electrical insulation. The inner region S1 of the columnar member 40 is a passage through which fuel passes. The inner region S2 of the columnar member 41 is a passage through which air passes. Further, an adhesive or the like (not shown) is provided on the surface where the columnar members 40 and 41 and the interconnector 11 come into contact. Note that the interconnectors 11 may not be connected by the above-described columnar members 40 and 41, and members having other shapes may be employed.

  The interconnector 11 includes a fuel introduction passage 17 that introduces fuel from the fuel introduction pipe 6, a fuel introduction passage 18 that introduces fuel to the fuel introduction pipe 7, an air introduction passage 19 that introduces air from the air introduction pipe 8, The air outlet pipe 9 has an air outlet passage 20 that guides air out. The fuel introduction passage 17, the fuel lead-out passage 18, the air introduction passage 19, and the air lead-out passage 20 all have an oblong cross-sectional shape. The fuel introduction passage 17 and the fuel lead-out passage 18 are disposed to face each other with the fuel flow path forming portion 15 and the air flow path forming portion 16 interposed therebetween. The air introduction passage 19 and the air outlet passage 20 are opposed to each other in a direction perpendicular to the opposing direction of the fuel introduction passage 17 and the fuel outlet passage 18 with the fuel flow passage forming portion 15 and the air flow passage forming portion 16 interposed therebetween. Has been. The fuel introduction passage 17, the fuel lead-out passage 18, the air introduction passage 19, and the air lead-out passage 20 extend in the Z-axis direction (stacking direction).

  In addition, the interconnector 11 includes a fuel inlet 21 that allows the reaction fluid to flow from the fuel introduction passage 17 to the fuel flow path forming portion 15, and a fuel outlet that allows the reaction fluid to flow from the fuel flow passage formation portion 15 to the fuel outlet passage 18. 22, an air inlet portion 23 for allowing the reaction fluid to flow from the air introduction passage 19 to the air flow path forming portion 16, and an air outlet portion 24 for allowing the reaction fluid to flow from the air flow passage forming portion 16 to the air outlet passage 20. Is formed.

  The fuel inlet portion 21 communicates with the fuel introduction passage 17 and the fuel flow path forming portion 15. The fuel outlet portion 22 communicates with the fuel outlet passage 18 and the fuel flow path forming portion 15. The fuel inlet portion 21 and the fuel outlet portion 22 are flow passages for flowing fuel from the fuel introduction passage 17 to the fuel outlet passage 18 and are flow passages extending in the Y-axis direction. The air inlet portion 23 is in communication with the air introduction passage 19 and the air flow path forming portion 16. The air outlet part 24 is in communication with the air outlet passage 20 and the air flow path forming part 16. The air inlet portion 23 and the air outlet portion 24 are flow paths for flowing air from the air introduction passage 19 to the air outlet passage 20, and extend in the X-axis direction.

  In such an interconnector 11, the direction in which the fuel flows from the fuel introduction passage 17 to the fuel lead-out passage 18 (first direction) is the Y-axis positive direction. The direction in which air flows from the air introduction passage 19 to the air outlet passage 20 (first direction) is the X-axis positive direction. That is, the direction in which the fuel flows from the fuel introduction passage 17 to the fuel extraction passage 18 and the direction in which the air flows from the air introduction passage 19 to the air extraction passage 20 intersect perpendicularly.

  The fuel introduced from the fuel introduction pipe 6 into the fuel introduction passage 17 is supplied to the fuel electrode 13 of the cell main body 10 through the fuel inlet portion 21 and the fuel flow path forming portion 15, and the fuel inlet portion 21 and the fuel lead-out. It is led out to the fuel lead-out pipe 7 through the passage 18. The air introduced from the air introduction pipe 8 into the air introduction passage 19 is supplied to the air electrode 14 of the cell body 10 through the air inlet portion 23 and the air flow path forming portion 16, and is also supplied to the air outlet portion 24 and the air outlet. It is led to the air outlet pipe 9 through the passage 20.

  Next, the characteristic part of the fuel cell 1 according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic cross-sectional view schematically showing a cross section taken along line III-III shown in FIG. FIG. 4 is a schematic cross-sectional view schematically showing a cross section taken along line IV-IV shown in FIG.

  As shown in FIG. 3, when viewed from the stacking direction, the fuel flow path forming unit 15 includes a flow part 52 through which fuel flows along the fuel electrode 13, and a planar direction extending in the stacking direction and orthogonal to the stacking direction. A reaction region 53 having a plurality of protrusions 50 arranged along the (XY plane direction) is formed. As shown in FIG. 4, when viewed from the stacking direction, the fuel flow path forming unit 15 includes a flow portion 54 through which air flows along the air electrode 14, and a planar direction extending in the stacking direction and orthogonal to the stacking direction. A reaction region 55 having a plurality of protrusions 51 arranged along the (XY plane direction) is formed. The reaction regions 53 and 55 include regions that may react when the reaction fluid and the cell body 10 come into contact (including regions configured not to react positively by providing the protrusions 50 and 51). ). Alternatively, the reaction regions 53 and 55 may be defined as a region where any one of the fuel electrode 13 and the air electrode 14 formed in the cell body 10 has a small area. 3 and 4, regions indicated by squares are schematically shown as reaction regions 53 and 55. In addition, in the reaction regions 53 and 55, regions other than the hatched protrusions 50 and 51 correspond to the flow portions 52 and 54.

  The fuel passes through the reaction region 53 from the Y-axis direction negative side (left side in FIGS. 3 and 4) toward the Y-axis direction positive side (right side in FIGS. 3 and 4). Further, with respect to the reaction region 55 (see FIG. 4) formed on the back side across the reaction region 53 and the cell body 10, from the X-axis direction negative side (upper side of the drawing in FIG. 3 and lower side of the drawing in FIG. 4). Air passes toward the Y axis direction positive side (the lower side in FIG. 3 and the upper side in FIG. 4).

  Based on the flow direction of the fuel and air, the arrangement pattern of the protrusions 50 and 51 differs depending on the position in the planar direction in the reaction regions 53 and 55. Specifically, when the fuel and air cross flow, at the position where the fuel inlet and the air outlet face each other, that is, the position on the negative side in the X-axis direction and the negative side in the Y-axis direction (position indicated by A in FIG. 6). The fuel and air supply tends to be excessive. On the other hand, at positions of opposite conditions, that is, positions on the X axis direction positive side and Y axis direction positive side (positions indicated by B in FIG. 6), the supply of fuel and air tends to be insufficient. Therefore, as shown in FIG. 3 (and FIG. 6A described later), the amount of fuel supplied is suppressed on the negative side in the X-axis direction, and the amount of fuel supplied is increased on the positive side in the X-axis direction. The cross-sectional area of each protrusion 50 increases from the negative side in the axial direction toward the positive side in the X-axis direction. In addition, although the protrusion part 50 of the same magnitude | size may be arrange | positioned with respect to the Y-axis direction which is a direction through which a fuel flows, you may change the magnitude | size of the protrusion part 50 according to the position of a Y-axis direction. Further, as shown in FIG. 4 (and FIG. 6B described later), the fuel supply amount is suppressed on the Y axis direction negative side, and the fuel supply amount is increased on the Y axis direction positive side. The cross-sectional area of each protrusion 51 increases from the negative side in the axial direction toward the positive side in the Y-axis direction. In addition, although the protrusion part 51 of the same magnitude | size may be arrange | positioned with respect to the X-axis direction which is a direction through which a fuel flows, you may change the magnitude | size of the protrusion part 51 according to the position of a Y-axis direction. The change pattern of the size of the projections 50 and 51 is not particularly limited, and the size of the projections 50 and 51 may be changed one by one, and the size of the projections 50 and 51 is changed every several rows. It may change.

  When the unit areas SA1 and SA2 are set for the reaction areas 53 and 55 as described above, the ratio of the protrusions 50 and 51 per unit area SA1 and SA2 in the reaction areas 53 and 55 is the planar direction ( It has regions WA1 and WA2 that are constant at each position in the (XY plane direction). In the present embodiment, the region on the positive side in the X-axis direction of the reaction region 53 with a small number of protrusions 50 per one area is smaller than the region on the negative side in the X-axis direction of the reaction region 55 with a large number of protrusions 50 per one. The number of protrusions 50 per unit area SA1 is set to be large. Further, the unit area SA1 is larger in the region on the positive side in the Y-axis direction of the reaction region 55 having a small protrusion 51 per unit than in the region on the negative side in the Y-axis direction of the reaction region 55 having a large protrusion 51 per unit. The number of hit projections 51 is set to be large.

  The areas WA1 and WA2 that satisfy the condition may be the entire area (100%) of the reaction areas 53 and 55, but may not be 100%. For example, the positions where the protrusions 50 and 51 are difficult to be provided, such as the vicinity of the outer edge portions of the reaction areas 53 and 55, may not be included in the areas WA1 and WA2. Alternatively, if the protrusions 50 and 51 are not partially formed near the center line CL1 or near the center line CL2 for a predetermined purpose, even if the vicinity of the center line CL1 or the center line CL2 is not included in the areas WA1 and WA2. Good. However, the regions WA1 and WA2 preferably have an area of 80% or more, and more preferably 90% or more of the entire reaction regions 53 and 55.

  The unit areas SA1 and SA2 are reference areas set at arbitrary positions with respect to the reaction regions 53 and 55. The unit areas SA1 and SA2 include at least both the flow portions 52 and 54 and the protrusions 50 and 51, regardless of the position in the XY direction in the reaction regions 53 and 55. 3 and 4, the unit areas SA1 and SA2 are shown only at the four corners of the reaction regions 53 and 55, but the unit areas SA1 and SA2 are also set at a position between these positions. The size and arrangement pattern of the protrusions 50 and 51 included in the unit areas SA1 and SA2 vary depending on the positions in the reaction regions 53 and 55 where the unit areas SA1 and SA2 are set. However, regardless of the difference in size and arrangement pattern, the ratio of the protrusions 50 and 51 per unit area SA1 and SA2 is constant at each position in the XY plane direction.

  When the unit areas SA1 and SA2 are too small, the proportion of the area occupied by the protrusions 50 and 51 in the unit areas SA1 and SA2 may change depending on the arrangement of the protrusions 50 and 51 included in the unit areas SA1 and SA2. . Therefore, by setting the unit areas SA1 and SA2 to a certain size, it is possible to prevent the proportion of the protrusions 50 and 51 from becoming too low. In addition, compared with the case where the protrusions 50 and 51 per one are small like the area | region of the X-axis direction positive side shown in FIG. 3, and the area | region of the Y-axis direction positive side shown in FIG. Projections 50 included in the unit areas SA1 and SA2 are regions having larger protrusions 50 and 51, such as the negative region in the X-axis direction and the negative region in the Y-axis direction shown in FIG. , 51 are liable to change the area ratio. For example, in the reaction regions 53 and 55, the region where the protrusions 50 and 51 having the largest area are formed (the region near the end on the negative side in the X-axis direction shown in FIG. 3 or the Y-axis direction shown in FIG. In the region near the negative end), the unit areas SA1 and SA2 are set to a size that includes the entire at least one protrusion 50, 51 no matter where the unit areas SA1, SA2 are arranged. It is preferable that

Here, the setting of the unit areas SA1 and SA2 will be described in more detail with reference to FIG. In the example shown in FIG. 5A, the unit areas SA1 and SA2 are squares having a side length of p. Moreover, the cross section of the projection parts 50 and 51 is a perfect circle of the diameter d. In the drawing, a state in which the four corners of the unit areas SA1 and SA2 are installed at the centers of the four protrusions 50 and 51 is shown. In this case, the ratio of the area occupied by the protrusions 50 and 51 per unit area SA1 and SA2 is a value obtained by dividing two areas of a circle with a radius d / 2 by the unit areas SA1 and SA2 (p ² ). At this time, the area of the unit areas SA1 and SA2 may be n times as large as the areas of the protrusions 50 and 51 having the maximum area. In this case, “n> 5” is set. If the ratio of the entire protrusions 50 and 51 to the areas WA1 and WA2 is 30 to 40%, the unit areas SA1 and SA2 are larger than five times the area of the protrusions 50 and 51 having the maximum area. If it is, it can suppress that an area ratio is calculated low. The upper limit of the unit areas SA1 and SA2 may be set to 50% of the entire area, for example.

  As shown in FIG. 5B, the protrusions 50 and 51 may be a pattern that extends with respect to the flow of the reaction fluid and is arranged so as to be vertically separated from the flow. In this case, a unit width (size is p) including at least both the flow parts 52 and 54 and the protrusions 50 and 51 is set for the reaction regions 53 and 55. The unit width p extends perpendicular to the flow of the reaction fluid in the planar direction. The reaction regions 53 and 55 have regions in which the ratio of the protrusions 50 and 51 per unit width p is constant at each position in the plane direction. 5B, the unit width p includes one protrusion 50, 51 having a width d, and one flow path that forms the flow portions 52, 54. Therefore, the ratio occupied by the protrusions 50 and 51 is indicated by “d / p”. However, the plurality of protrusions 50 and 51 may be included in the unit width p. When the unit width p is set, the unit width p may be n times the width d, where d is the width of the protrusions 50 and 51. In this case, “n> 5” is set.

  In the present embodiment, the proportion of the protrusions 50 and 51 per unit area SA1, SA2 or unit width p is constant at each position in the plane direction, but “constant” here is completely constant. There is no need and some error is allowed. For example, when the ratio of the protrusions 50 and 51 per unit area SA1, SA2 or unit width p is within 10% of an error from a predetermined ratio, the ratio is assumed to be constant. For example, if the reference “predetermined ratio” is 40%, the range of 40 ± 10% is within the error range. The “predetermined ratio” serving as a reference is not particularly limited.

  Further, the ratio per unit area SA1, SA2 or unit width p in the reaction region 53 on the fuel electrode 13 side and the ratio per unit area SA1, SA2 or unit width p on the reaction region 55 on the air electrode 14 side are: , May be constant. However, each area ratio may not be constant.

  Next, the operation and effect of the fuel cell 1 according to this embodiment will be described.

  Here, FIG. 6 is a diagram showing a schematic configuration of the arrangement pattern of the protrusions 50 and 51 of the reaction regions 53 and 55 of the fuel cell according to the comparative example. In the fuel cell according to the comparative example, as in the fuel cell 1 according to the present embodiment, the protrusion is provided so that the fuel is uniformly supplied to the fuel electrode 13 and the air is supplied uniformly to the air electrode 14. The sizes of 50 and 51 are set to be different depending on the positions. However, the area ratio of the protrusions 50 and 51 at the positions where the protrusions 50 and 51 are large and small is different depending on the position in the plane direction. Accordingly, there may be a problem that the reaction between the reaction fluid and the air electrode 14 or the fuel electrode 13 is biased depending on the position in the flow path.

  In the fuel cell 1 according to the present embodiment, the arrangement pattern of the protrusions 50 and 51 is set so that the reaction fluid is uniformly supplied to the air electrode 14 or the fuel electrode 13 as in the comparative example of FIG. Yes. In addition, when the unit areas SA1 and SA2 or the unit width p including at least both the flow parts 52 and 54 and the protrusions 50 and 51 are set for the reaction areas 53 and 55, the reaction areas 53 and 55 Areas WA1 and WA2 in which the proportions of the protrusions 50 and 51 per unit width p are constant at each position in the plane direction. Thereby, even if the arrangement pattern of the protrusions 50 and 51 differs depending on the position in the planar direction in the reaction regions 53 and 55, the ratio of the protrusions 50 and 51 in each position in the planar direction of the reaction regions 53 and 55 (Area ratio or width ratio) can be made constant. Thereby, the ratio of the flow parts 52 and 54 through which the reaction fluid flows along the fuel electrode 13 or the air electrode 14 can be made constant regardless of the position of the reaction regions 53 and 55 in the planar direction. Accordingly, it is possible to reduce the bias due to the position in the planar direction of the reaction between the reaction fluid and the air electrode 14 or the fuel electrode 13 and improve the uniformity of the reaction. Moreover, it can also suppress that pressure loss becomes large too much in part.

  At each position in the planar direction, the ratio (area ratio or width ratio) per unit area SA1 or unit width p in the reaction region 53 on the fuel electrode 13 side, and the unit area SA2 in the reaction region 55 on the air electrode 14 side. Or the ratio per unit width p is constant. Thus, by making the ratio per unit area SA1, SA2 or unit width p constant for both the fuel electrode 13 side and the air electrode 14 side, the reaction fluid for either the fuel electrode 13 or the air electrode 14 can be obtained. It can suppress becoming excessive.

  When the ratio of the protrusions 50 and 51 per unit area SA1, SA2 or unit width p is within 10% of the error from the predetermined ratio, the ratio is constant. Thereby, it can be considered that it is constant when the ratio occupied by the protrusions 50 and 51 per unit area SA1, SA2 or unit width p changes within an error range.

  The present invention is not limited to the embodiment described above.

  For example, the arrangement pattern of the protrusions is not limited to the above-described embodiment, and any arrangement pattern may be adopted as long as it varies depending on the position of the reaction region in the planar direction. For example, the protruding portion is not limited to a circular shape, and may have an elliptical shape or a rhombus shape. Also, the groove shape may adopt a pattern in which the width is changed in the length direction.

  Further, the shape of the unit area is not limited to a square, and any shape such as a rectangle or a circle may be adopted. Further, the cross-sectional shape of the protrusion is not particularly limited, and any shape such as a rectangle may be adopted.

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell, 10 ... Cell main body, 11 ... Interconnector, 12 ... Electrolyte, 13 ... Fuel electrode, 14 ... Air electrode, 15 ... Fuel flow path formation part, 16 ... Air flow path formation part, 50, 51 ... Protrusion Part, 52, 54 ... distribution part, 53, 55 ... reaction region.

Claims (3)

A cell body having a fuel electrode disposed on one surface side of the electrolyte and an air electrode disposed on the other surface side of the electrolyte, and generating and reacting fuel and air;
The cell body is stacked so as to be sandwiched from the fuel electrode side or the air electrode side, and in the stacking direction, facing the fuel electrode or the air electrode, a flow path for flowing the fuel or air as a reaction fluid is formed. An interconnector having a portion,
When viewed from the laminating direction, the flow path forming portion includes a flow portion through which the reaction fluid flows along the fuel electrode or the air electrode, and a planar direction extending in the laminating direction and orthogonal to the laminating direction. A reaction region having a plurality of protrusions arranged,
The arrangement pattern of the protrusions differs depending on the position in the planar direction in the reaction region,
When the unit area or unit width including at least both the flow part and the protrusion is set for the reaction region,
The reaction region includes a region in which a ratio of the protrusion per unit area or unit width is constant at each position in the planar direction.   The ratio per unit area or unit width in the reaction region on the fuel electrode side and the ratio per unit area or unit width in the reaction region on the air electrode side are constant. The fuel cell according to claim 1.   2. The ratio is constant when the ratio of the protrusions per unit area or unit width within each plane position is within 10% of an error from a predetermined ratio. Or the fuel cell of 2.

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