JP2014049383A - Fuel cell stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely inhibit a temperature drop in an end cell and ensure a desired sealing function while maintaining good power generation performance in a simple and economical configuration.SOLUTION: The fuel cell stack 10 includes a terminal plate 16b, an insulation plate 18b and an end plate 20b, which are disposed on one end of a laminated body 14 formed by laminating a plurality of power generation cells 12. Between the terminal plate 16b and the insulation plate 18b, a sheet-like heater 72 with a connector 74 is provided and, in the insulation plate 18b, an opening section 70 for inserting the connector 74 is formed.

Description

  The present invention includes a power generation cell having an electrolyte / electrode structure in which electrodes are arranged on both sides of an electrolyte and a separator, and a terminal plate on both sides in a stacking direction of the stacked body in which a plurality of the power generation cells are stacked. The present invention relates to a fuel cell stack in which an insulating member and an end plate are disposed.

  For example, a solid polymer fuel cell employs a solid polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell comprises an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode each having an electrode catalyst (electrode catalyst layer) and porous carbon (gas diffusion layer) are disposed on both sides of a solid polymer electrolyte membrane ( A power generation cell is formed in which the MEA is sandwiched between separators (bipolar plates).

  In many cases, a fuel cell stack having a stack in which a predetermined number of power generation cells are stacked is provided, and a terminal plate, an insulating plate, and an end plate are disposed on both sides of the stack in the stacking direction. This type of fuel cell stack is used as, for example, an in-vehicle fuel cell stack mounted on a fuel cell electric vehicle.

  In this type of fuel cell stack, there are power generation cells that tend to cause a temperature drop compared to other power generation cells due to heat radiation to the outside. For example, a power generation cell (hereinafter also referred to as an end cell) disposed at the end in the stacking direction has a large amount of heat released from a terminal plate, an end plate, etc. adjacent to the power generation cell, and the above-described temperature decrease becomes significant. ing.

  Thus, for example, a fuel cell stack structure disclosed in Patent Document 1 is known. In this stack structure, in a cell stack of a fuel cell, for example, a solid polymer electrolyte fuel cell, a layer in which a gas flow path that does not contribute to power generation is formed at least at the end of the gas diffusion layer.

JP 2003-338305 A

  In the above-mentioned Patent Document 1, the layer is constituted by a dummy cell that substantially has a gas flow path but does not have an MEA. For this reason, a dedicated dummy cell is required, and there are problems that the number of components and the types of components increase, the manufacturing process of the fuel cell becomes complicated, and the manufacturing cost increases.

  The present invention solves this type of problem, and with a simple and economical configuration, it is possible to reliably prevent the temperature drop of the end cell, maintain good power generation performance, and achieve a desired seal. An object of the present invention is to provide a fuel cell stack capable of ensuring the function.

  The present invention includes a power generation cell having an electrolyte / electrode structure in which electrodes are arranged on both sides of an electrolyte and a separator, and a terminal plate on both sides in a stacking direction of the stacked body in which a plurality of the power generation cells are stacked. The present invention relates to a fuel cell stack in which an insulating member and an end plate are disposed.

  In this fuel cell stack, a sheet-like heater having a connector portion is interposed between at least one terminal plate and the insulating member, while the inside of the insulating member and between the insulating member and the terminal plate. Alternatively, an opening that extends in a direction crossing the stacking direction and into which the connector portion is inserted is formed in the terminal plate.

  Further, in this fuel cell stack, it is preferable that the insulating member has a recess for accommodating the terminal plate, and the recess communicates with the outside through the opening.

  Further, in this fuel cell stack, it is preferable that the insulating member is formed with a hole that penetrates in the stacking direction, and the hole communicates with the opening.

  According to the present invention, a sheet heater is interposed between the terminal plate and the insulating member instead of the dummy cell. For this reason, it is possible to shorten the dimension in the stacking direction of the entire fuel cell stack as much as possible.

  And the connector part of a sheet-like heater is inserted in the opening part extended in the direction which cross | intersects a lamination direction, and is exposed outside from the side part of a fuel cell stack. Therefore, the connector portion is not disposed on the plate surface of the insulating plate, and the deterioration of the sealing function due to the seal member in contact with the plate surface can be suppressed as much as possible.

  Thereby, with a simple and economical configuration, it is possible to reliably prevent a temperature drop of the end cell, maintain a good power generation performance, and ensure a desired sealing function.

1 is a partially exploded schematic perspective view of a fuel cell stack according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the fuel cell stack taken along line II-II in FIG. 1. It is a disassembled perspective explanatory drawing of the power generation cell which comprises the said fuel cell stack. FIG. 6 is a cross-sectional explanatory view on one end side in a stacking direction of a fuel cell stack according to a second embodiment of the present invention. FIG. 6 is a cross-sectional explanatory view on one end side in a stacking direction of a fuel cell stack according to a third embodiment of the present invention. FIG. 6 is a cross-sectional explanatory view on one end side in a stacking direction of a fuel cell stack according to a fourth embodiment of the present invention. FIG. 9 is a partially exploded schematic perspective view of a fuel cell stack according to a fifth embodiment of the present invention. It is the VIII-VIII sectional view taken on the line of the said fuel cell stack in FIG. It is a disassembled perspective explanatory drawing of the power generation cell which comprises the said fuel cell stack.

  As shown in FIGS. 1 and 2, the fuel cell stack 10 according to the first embodiment of the present invention includes a stacked body 14 in which a plurality of power generation cells 12 are stacked in the horizontal direction (arrow A direction).

  A terminal plate 16a, an insulating plate (insulating member) 18a, and an end plate 20a are sequentially disposed at one end in the stacking direction (arrow A direction) of the stacked body 14 (see FIG. 1). A terminal plate 16b, an insulating plate (insulating member) 18b, and an end plate 20b are sequentially disposed on the other end in the stacking direction of the stacked body 14 (see FIGS. 1 and 2).

  The fuel cell stack 10 is, for example, integrally held by a box-like casing (not shown) including end plates 20a, 20b configured in a rectangular shape as end plates, or a plurality of tie rods extending in the direction of arrow A (Not shown) are integrally clamped and held.

  As shown in FIGS. 2 and 3, the power generation cell 12 includes an electrolyte membrane / electrode structure 22, and a first metal separator 24 and a second metal separator 26 that sandwich the electrolyte membrane / electrode structure 22. The first metal separator 24 and the second metal separator 26 are formed by, for example, pressing a corrugated metal sheet, a stainless steel sheet, an aluminum sheet, a plated steel sheet, or a thin metal sheet having a surface treatment for corrosion prevention on the metal surface thereof. However, for example, a carbon separator may be used.

  The electrolyte membrane / electrode structure 22 includes, for example, a solid polymer electrolyte membrane 28 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode electrode 30 and a cathode electrode 32 sandwiching the solid polymer electrolyte membrane 28. Prepare. The solid polymer electrolyte membrane 28 has a larger planar dimension than the anode electrode 30 and the cathode electrode 32.

  The electrolyte membrane / electrode structure 22 may constitute a step MEA in which the anode electrode 30 and the cathode electrode 32 are set to have different plane dimensions.

  The anode electrode 30 and the cathode electrode 32 are formed by uniformly applying a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the gas diffusion layer. And an electrode catalyst layer (not shown) to be formed. The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 28.

  One end edge of the power generation cell 12 in the direction of arrow B (the horizontal direction in FIG. 3) communicates with each other in the direction of arrow A, which is the stacking direction, and oxidant for supplying an oxidant gas, for example, an oxygen-containing gas An agent gas inlet communication hole 34a, a cooling medium inlet communication hole 36a for supplying a cooling medium, and a fuel gas outlet communication hole 38b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided in an arrow C direction (vertical direction). Are provided in an array.

  The other end edge of the power generation cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, a fuel gas inlet communication hole 38a for supplying fuel gas, and a cooling medium outlet communication hole for discharging the cooling medium. 36 b and an oxidant gas outlet communication hole 34 b for discharging the oxidant gas are arranged in the direction of arrow C.

  On the surface 24 a of the first metal separator 24 facing the electrolyte membrane / electrode structure 22, for example, a fuel gas channel 40 extending in the arrow B direction is formed. The fuel gas passage 40 communicates with the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b.

  On the surface 26 a of the second metal separator 26 facing the electrolyte membrane / electrode structure 22, for example, an oxidant gas channel 42 extending in the direction of arrow B is provided. The oxidant gas flow path 42 communicates with the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b.

  A cooling medium flow path 44 communicating with the cooling medium inlet communication hole 36a and the cooling medium outlet communication hole 36b is formed between the surface 24b of the first metal separator 24 and the surface 26b of the second metal separator 26 adjacent to each other. Is done. The cooling medium flow path 44 is formed by overlapping the back surface shape of the fuel gas flow path 40 and the back surface shape of the oxidant gas flow path 42.

  As shown in FIGS. 2 and 3, the first seal member 48 is integrated with the surfaces 24 a and 24 b of the first metal separator 24 around the outer periphery of the first metal separator 24. The second seal member 50 is integrated with the surfaces 26 a and 26 b of the second metal separator 26 around the outer peripheral end of the second metal separator 26.

  The first seal member 48 and the second seal member 50 include, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber, and cushioning materials. Alternatively, an elastic seal member such as a packing material is used.

  As shown in FIG. 1, terminal portions 58a and 58b extending outward in the stacking direction are provided at substantially the center of the terminal plates 16a and 16b. The terminal portions 58a and 58b are inserted into the insulating cylindrical body 60 and penetrate the hole portions 62a and 62b of the insulating plates 18a and 18b and the hole portions 64a and 64b of the end plates 20a and 20b, and the end plates 20a and 20b. Project outside.

  The insulating plates 18a and 18b are formed of an insulating material such as polycarbonate (PC) or phenol resin. The insulating plate 18 a is provided with a rectangular recess 66 at the center, and the hole 62 a communicates with the approximate center of the recess 66. The recess 66 accommodates the terminal plate 16a, and the terminal portion 58a of the terminal plate 16a is inserted into the hole 62a with the insulating cylinder 60 interposed. The depth of the recess 66 is set to a dimension smaller than the thickness of the terminal plate 16a.

  The insulating plate 18b is configured in the same manner as the insulating plate 18a, and has a recess 68 in which an end on the laminated body 14 side is opened. A hole 62b communicates with the approximate center of the bottom surface 68a constituting the recess 68. In one side portion of the insulating plate 18b, an opening portion 70 into which a connector portion 74 connected to a sheet heater 72 described later is inserted is formed. As shown in FIG. 2, the opening 70 has a slit shape and the like, and extends along the arrow B direction orthogonal to the stacking direction (arrow A direction).

  A sheet heater 72 is interposed between the terminal plate 16b and the insulating plate 18b. The sheet-like heater 72 has a heating element covered with an insulating film, and a connector part 74 is provided at the end so as to protrude outward. A hole 76 for inserting the terminal portion 58 b is formed in the center portion of the sheet heater 72.

  The sheet heater 72 has a rectangular shape and is accommodated in the recess 68 of the insulating plate 18b, and the connector portion 74 is inserted into the opening 70 and exposed to the outside. The connector part 74 is connected to a power source (not shown).

  The operation of the fuel cell stack 10 configured as described above will be described below.

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 34a of the end plate 20a. Fuel gas such as hydrogen-containing gas is supplied to the fuel gas inlet communication hole 38a of the end plate 20a. A cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 36a of the end plate 20a.

  As shown in FIG. 3, the oxidant gas is introduced into the oxidant gas flow path 42 of the second metal separator 26 from the oxidant gas inlet communication hole 34a. The oxidant gas moves in the direction of arrow B and is supplied to the cathode electrode 32 of the electrolyte membrane / electrode structure 22.

  On the other hand, the fuel gas is introduced into the fuel gas flow path 40 of the first metal separator 24 from the fuel gas inlet communication hole 38a. The fuel gas moves in the direction of arrow B along the fuel gas flow path 40 and is supplied to the anode electrode 30 of the electrolyte membrane / electrode structure 22.

  Accordingly, in each electrolyte membrane / electrode structure 22, the oxidant gas supplied to the cathode electrode 32 and the fuel gas supplied to the anode electrode 30 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Done.

  Next, the oxidant gas consumed by being supplied to the cathode electrode 32 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 34b. Similarly, the fuel gas consumed by being supplied to the anode electrode 30 is discharged in the direction of arrow A along the fuel gas outlet communication hole 38b.

  The cooling medium supplied to the cooling medium inlet communication hole 36 a is introduced into the cooling medium flow path 44 between the first metal separator 24 and the second metal separator 26 and then flows in the direction of arrow B. This cooling medium is discharged from the cooling medium outlet communication hole 36b after the electrolyte membrane / electrode structure 22 is cooled.

  In this case, in the first embodiment, as shown in FIGS. 1 and 2, a sheet heater 72 is interposed between the terminal plate 16b and the insulating plate 18b in place of the dummy cell. For this reason, the dimension in the stacking direction of the entire fuel cell stack 10 can be shortened as much as possible.

  Moreover, the connector portion 74 of the sheet heater 72 is inserted into the opening 70 extending in a direction intersecting the stacking direction of the insulating plates 18b, and is exposed to the outside from the side portion of the fuel cell stack 10. Therefore, the connector portion 74 is not disposed on the plate surface (surface facing the laminate 14) 18bp of the insulating plate 18b. As a result, as shown in FIG. 2, it is possible to suppress as much as possible a decrease in the sealing function by the second seal member 50 of the second metal separator 26 that contacts the plate surface 18bp of the insulating plate 18b.

  For this reason, with a simple and economical configuration, it is possible to reliably prevent the temperature drop of the power generation cell 12 (end cell) disposed at the end in the stacking direction, while maintaining good power generation performance and The effect that it becomes possible to ensure the sealing function is obtained.

  In the first embodiment, the sheet heater 72 may be one end in the stacking direction of the fuel cell stack 10 or may be applied to both ends in the stacking direction. The same applies to the second and subsequent embodiments described below.

  FIG. 4 is a cross-sectional explanatory view on one end side in the stacking direction of the fuel cell stack 80 according to the second embodiment of the present invention. The same components as those of the fuel cell stack 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The fuel cell stack 80 includes an insulating plate 18b. The insulating plate 18b is formed with an opening 82 into which a connector portion 74 connected to the sheet heater 72 is inserted. The opening 82 has a slit shape and the like, and extends while being inclined toward the end plate 20b with respect to the arrow B direction orthogonal to the stacking direction (arrow A direction).

  In the second embodiment configured as described above, the opening 82 extends while inclining toward the end plate 20b. For this reason, when installing the sheet-like heater 72, the connector part 74 can be easily inserted in the opening part 82. FIG. Therefore, it is possible to obtain an effect that the installation work of the sheet heater 72 can be performed more easily and efficiently.

  FIG. 5 is an explanatory cross-sectional view of one end side in the stacking direction of the fuel cell stack 90 according to the third embodiment of the present invention.

  The fuel cell stack 90 includes an insulating plate 18b, and an opening 92 into which the connector 74 connected to the sheet heater 72 is inserted is formed in the insulating plate 18b. The opening 92 has a slit shape or the like, and extends while being inclined toward the side away from the end plate 20b with respect to the arrow B direction orthogonal to the stacking direction (arrow A direction).

  In the third embodiment configured as described above, the opening 92 extends while being inclined toward the side away from the end plate 20b. For this reason, the connector part 74 is installed so that the sheet-like heater 72 is pressed against the bottom surface 68 a of the recess 68. Therefore, there is an effect that the sheet heater 72 can be more reliably installed in the recess 68 without causing the sheet heater 72 to be displaced.

  FIG. 6 is a cross-sectional explanatory view on one end side in the stacking direction of the fuel cell stack 100 according to the fourth embodiment of the present invention.

  The fuel cell stack 100 includes an insulating plate 18b, and the insulating plate 18b is formed with a hole 102 into which a connector portion 74 connected to the sheet heater 72 is inserted. The hole 102 is formed through the insulating plate 18b in the stacking direction. The hole portion 102 communicates with an opening portion 104 formed between the insulating plate 18b and the end plate 20b, and the opening portion 104 extends along the arrow B direction orthogonal to the stacking direction.

  The opening 104 is configured by forming a groove on the surface of the end plate 20b, but the groove may be formed on the surface of the insulating plate 18b. Further, the opening 104 may be formed in a slit shape inside the end plate 20b.

  The corner portion of the hole portion 102 forms an R-shaped portion (curved shape portion) 102 a, while an R-shaped portion (curved shape portion) 104 a is formed at the boundary between the opening portion 104 and the hole portion 102. .

  In the fourth embodiment configured as described above, when the connector portion 74 is inserted into the hole portion 102 of the insulating plate 18b, the connector portion 74 is inserted into the opening portion 104 from the hole portion 102 and from the side portion of the end plate 20b. Exposed to the outside.

  At that time, R-shaped portions 102 a and 104 a are provided at the corners of the hole 102 and the opening 104. For this reason, when installing the sheet-like heater 72 in the recessed part 68, the installation operation | work of the connector part 74 is performed easily and it becomes possible to suppress the damage of the said connector part 74 as much as possible. Is obtained.

  As shown in FIG. 7, the fuel cell stack 110 according to the fifth embodiment of the present invention includes a stacked body 114 in which a plurality of power generation cells 112 are stacked in the horizontal direction (arrow A direction). A terminal plate 116a, an insulating plate (insulating member) 118a, and an end plate 120a are sequentially arranged at one end in the stacking direction (arrow A direction) of the stacked body 114 toward the outside. At the other end in the stacking direction of the stacked body 114, a terminal plate 116b, an insulating plate (insulating member) 118b, and an end plate 120b are sequentially disposed outward (see FIGS. 7 and 8).

  As shown in FIG. 9, the power generation cell 112 includes a first metal separator 124, a first electrolyte membrane / electrode structure (electrolyte / electrode structure) 126a, a second metal separator 128, and a second electrolyte membrane / electrode structure 126b. And a third metal separator 130 is provided. The first metal separator 124, the second metal separator 128, and the third metal separator 130 are, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a vertically long metal whose surface has been subjected to anticorrosion treatment. Although constituted by a plate, for example, a carbon separator may be used.

  As shown in FIGS. 8 and 9, the first electrolyte membrane / electrode structure 126a and the second electrolyte membrane / electrode structure 126b are, for example, solid polymer electrolyte membranes in which a perfluorosulfonic acid thin film is impregnated with water. 132, and an anode electrode 134 and a cathode electrode 136 that sandwich the solid polymer electrolyte membrane 132. The anode electrode 134 constitutes a step MEA having a smaller planar dimension than the cathode electrode 136, but conversely, the anode electrode 134 may have a larger planar dimension than the cathode electrode 136.

  An oxidant gas inlet communication hole 34a and a fuel gas inlet communication hole 38a are provided at the upper edge of the power generation cell 112 in the long side direction (arrow C direction). A fuel gas outlet communication hole 38b and an oxidant gas outlet communication hole 34b are provided at the lower edge of the power generation cell 112 in the long side direction (arrow C direction). A pair of cooling medium inlet communication holes 36a are provided above both edge portions in the short side direction (arrow B direction) of the power generation cell 112, and a pair of cooling medium inlet communication holes 36a are provided below both edge portions in the short side direction of the power generation cell 112. The cooling medium outlet communication hole 36b is provided.

  A first fuel gas flow path 40a that connects the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b is formed on a surface 124a of the first metal separator 124 that faces the first electrolyte membrane / electrode structure 126a. . A part of the cooling medium flow path 44 that connects the cooling medium inlet communication hole 36 a and the cooling medium outlet communication hole 36 b is formed on the surface 124 b of the first metal separator 124.

  On the surface 128a of the second metal separator 128 facing the first electrolyte membrane / electrode structure 126a, there is a first oxidant gas flow path 42a that connects the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b. It is formed. A second fuel gas flow path 40b that connects the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b is formed on the surface 128b of the second metal separator 128 that faces the second electrolyte membrane / electrode structure 126b. .

  On the surface 130a of the third metal separator 130 facing the second electrolyte membrane / electrode structure 126b, there is a second oxidant gas flow path 42b communicating the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b. It is formed. A part of the coolant flow path 44 is formed on the surface 130 b of the third metal separator 130.

  A first seal member 138 is integrally formed on the surfaces 124 a and 124 b of the first metal separator 124 around the outer peripheral edge of the first metal separator 124. A second seal member 140 is integrally formed around the outer peripheral edge of the second metal separator 128 on the surfaces 128a and 128b of the second metal separator 128, and the surfaces 130a and 130b of the third metal separator 130 are integrally formed. The third seal member 142 is integrally molded around the outer peripheral edge of the third metal separator 130.

  The first metal separator 124 includes a plurality of inlet connection channels 144a that connect the fuel gas inlet communication holes 38a and the first fuel gas channel 40a, a fuel gas outlet communication hole 38b, and the first fuel gas channel 40a. And a plurality of outlet connection channels 144b communicating with each other.

  The second metal separator 128 includes a plurality of inlet connection channels 146a that connect the fuel gas inlet communication holes 38a and the second fuel gas channels 40b, a fuel gas outlet communication hole 38b, and the second fuel gas channels 40b. And a plurality of outlet connection channels 146b communicating with each other.

  As shown in FIG. 7, a sheet-like heater 72 is installed on at least one end of the laminated body 114, in the fifth embodiment, on the insulating plate 118b side. The insulating plate 118b is provided with a recess 68 and communicates with the recess 68 to form, for example, an opening 70 similar to that of the first embodiment. Instead of the opening 70, any one of the second to fourth embodiments may be adopted.

  Thus, in the third embodiment, the sheet heater 72 is provided, and the connector portion 74 of the sheet heater 72 is inserted into the opening 70. Therefore, in the fifth embodiment, with a simple and economical configuration, it is possible to reliably prevent the temperature drop of the power generation cell 112 disposed at the end in the stacking direction, while maintaining good power generation performance, The same effects as those of the first to fourth embodiments can be obtained, such as ensuring a desired sealing function.

10, 80, 90, 100, 110 ... Fuel cell stack 12, 112 ... Power generation cell 14, 114 ... Laminated bodies 16a, 16b, 116a, 116b ... Terminal plates 18a, 18b, 118a, 118b ... Insulating plates 20a, 20b, 120a , 120b ... end plates 22, 126a, 126b ... electrolyte membrane / electrode structures 24, 26, 124, 128, 130 ... metal separators 28, 132 ... solid polymer electrolyte membranes 30, 134 ... anode electrodes 32, 136 ... cathode electrodes 34a ... Oxidant gas inlet communication hole 34b ... Oxidant gas outlet communication hole 36a ... Cooling medium inlet communication hole 36b ... Cooling medium outlet communication hole 38a ... Fuel gas inlet communication hole 38b ... Fuel gas outlet communication hole 40 ... Fuel gas flow path 42 ... Oxidant gas passage 44 ... Cooling medium passage 48, 50, 138, 1 40, 142 ... Sealing members 66, 68 ... Recess 68a ... Bottom surface 70, 82, 92, 104 ... Opening 72 ... Sheet heater 74 ... Connector part 102 ... Hole 102a, 104a ... R-shaped part

Claims (3)

A power generation cell having an electrolyte / electrode structure in which electrodes are disposed on both sides of the electrolyte and a separator, and a terminal plate, an insulating member, and an end are provided on both sides in the stacking direction of the stacked body in which the plurality of power generation cells are stacked A fuel cell stack in which a plate is disposed,
Between the at least one terminal plate and the insulating member, a sheet heater having a connector portion is interposed,
An opening is formed in the insulating member, between the insulating member and the terminal plate, or in the terminal plate, extending in a direction intersecting the stacking direction and into which the connector portion is inserted. A fuel cell stack characterized by that. 2. The fuel cell stack according to claim 1, wherein the insulating member is formed with a recess for accommodating the terminal plate,
The concave portion communicates with the outside through the opening.   3. The fuel cell stack according to claim 1, wherein the insulating member includes a hole penetrating in the stacking direction, and the hole communicates with the opening.

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