JP2008310991A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology that leakage of a reaction gas from a fuel cell can be detected, using a simple and easy constitution. <P>SOLUTION: A fuel cell stack 100C is equipped with a laminate 10 in which a membrane electrode assembly 50 and a separator 60 are alternately laminated. A tightening film F constituted of a polymer resin film is wound around a side face of the laminate 10. A thin membrane coated by a pressure-sensitive paint PP, in which a light emission amount changes according to oxygen concentration is formed on a surface of the tightening film F. If hydrogen leaks to the outside of the fuel cell stack 100C, since the local oxygen concentration at a leaking place is reduced due to hydrogen leakage, the fluorescence amount of the pressure-sensitive paint PP is increased. That is, a dye-coated tightening film FP coated by the pressure-sensitive paint PP functions as a leakage gas inspecting part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell.

  A fuel cell normally generates power by receiving a supply of a reaction gas such as hydrogen or oxygen. In addition, in the fuel cell, the reaction gas may leak due to misalignment of constituent members. Such leakage of the reaction gas not only causes a decrease in the power generation efficiency of the fuel cell, but also may cause deterioration of equipment provided around the fuel cell and an accident. Until now, various techniques for preventing leakage of reaction gas have been proposed (Patent Document 1, etc.).

JP 2006-172814 A JP 2005-345338 A JP 2006-156038 A JP 2002-56883 A JP 2006-179433 A

  By the way, the fuel cell may be disposed in a limited space such as a vehicle, and it is preferable to reduce the size and weight. Therefore, it is preferable that the detection sensor, the prevention system, and the like for preventing the reaction gas leakage provided in the fuel cell have a simple configuration. However, the reality is that until now there has not been enough ingenuity to meet these requirements.

  An object of this invention is to provide the technique which can detect the leakage of the reactive gas from a fuel cell by simple structure.

  One aspect of the present invention is a fuel cell, comprising a leaked gas inspected portion for inspecting whether or not a reactant gas leaks to the outside of the fuel cell, and the leaked gas inspected portion has an oxygen concentration. A pressure-sensitive dye whose light emission amount is changed accordingly is applied. According to this configuration, when the local oxygen concentration is reduced due to the ejection of the reaction gas, the light emission amount of the pressure sensitive dye in the leaked gas detection unit changes. Therefore, it is possible to detect the leakage of the reaction gas with a simple configuration and high accuracy.

  The fuel cell may further include a laminated body in which membrane electrode assemblies and separators are alternately laminated, and the leakage gas inspected portion may be provided on a side surface of the laminated body. According to this configuration, the reaction gas leaking from the contact interface between the membrane electrode assembly and the separator can be detected accurately with a simple configuration.

  The leaked gas inspected part has a film-like member coated with the pressure-sensitive dye on the surface, and the film-like member is wound so as to cover the side surface of the laminate. good. According to this configuration, the amount of the reactive gas leaking from the contact interface between the membrane electrode assembly and the separator can be suppressed by the film-like member, and the reactive gas leakage can be detected by the pressure sensitive dye.

  The separator has a plurality of plate-like members including an anode plate disposed on the anode side of the membrane electrode assembly, and an outer periphery of the anode plate is another plate-like member on a side surface of the laminate. The recessed part is provided by providing smaller than the outer periphery of this, and the said leakage gas to-be-inspected part is good also as what has the pressure-sensitive dye layer containing the said pressure-sensitive dye formed in the said recessed part. According to this configuration, when the reaction gas leaks, the light emission amount of the pressure-sensitive dye in the concave portion where the leakage occurs changes, so that it is easy to identify the location where the reaction gas leaks. Therefore, leakage gas detection accuracy can be improved.

  The present invention can be realized in various forms, for example, in the form of a fuel cell stack, a fuel cell system including the fuel cell stack, a vehicle equipped with the fuel cell system, and the like. Can do.

A. First embodiment:
FIG. 1 is a schematic perspective view showing the configuration of a fuel cell stack used in one embodiment of the present invention. The fuel cell stack 100 is a solid polymer fuel cell that generates power by receiving supply of hydrogen and oxygen as reaction gases. The fuel cell stack 100 may not be a polymer electrolyte fuel cell, and the present invention can be applied to any of various types of fuel cells.

  The fuel cell stack 100 is configured to fasten the fuel cell stack 100 with the laminated body 10 in which membrane electrode assemblies and separators are alternately laminated, the two end plates 21 and 22 that sandwich the laminated body 10 in the laminating direction. The fastening member 30 is provided.

  The two end plates 21 and 22 are substantially rectangular plate-like members that substantially overlap the stacked body 10 when viewed along the stacking direction of the fuel cell stack 100. The laminated body 10 has a circumscribed rectangular portion 11 that is a rectangular groove extending in the laminating direction at a portion that overlaps the four corners 24 of the end plates 21 and 22 and the central portion 25 of the two long sides. The straight rod-shaped shaft portion 31 of the fastening member 30 passes through the circumscribed rectangular portion 11 of the laminated body 10 and penetrates the four corners 24 and the two central portions 25 of the two end plates 21 and 22 in total. Nut portions 32 are provided at both ends of the shaft portion 31, and the laminated body 10 receives a fastening load in the stacking direction from the two end plates 21 and 22 by screwing the nut portion 32.

  A fitting recess 28 is provided at the center of the outer surface of the two end plates 21 and 22. The fitting recess 28 functions as a fitting hole when the fuel cell stack 100 is attached to a fastening film winding device described later. The end plate 21 disposed on the upper side of the laminate 10 in the stacking direction (upward in the drawing) is provided with a through hole for connecting a manifold hole for the reaction gas and an external pipe. However, illustration is omitted.

  The fuel cell stack 100 is fastened by the fastening member 30. For example, when the fuel cell stack 100 is disposed on a moving body such as a vehicle, an inertial force may act in a direction other than the direction in which the fastening load is applied. is there. Even when the fuel cell stack 100 is not transported, there is a possibility that such inertial force may be exerted when the fuel cell stack 100 is transported. Then, the separator and the membrane electrode assembly of the fuel cell stack 100 may cause a positional shift in the surface direction due to the inertial force. In particular, during power generation of the fuel cell stack 100, a change in fastening load due to a difference in thermal expansion between the fastening member 30 and the laminated body 10 may occur due to a temperature change due to power generation, so that the possibility of occurrence of misalignment increases. Therefore, in this embodiment, the fastening force is improved by winding a film-like member (hereinafter referred to as “fastening film”) around the side surface portion of the fuel cell stack 100.

  FIG. 2 is a schematic view showing a fastening film winding apparatus 200 for winding a fastening film around the side surface of the fuel cell stack 100. The fastening film winding apparatus 200 includes a roll film attachment portion 220 and a stack attachment portion 230 at both ends of the base portion 210 arranged horizontally. A reel 221 is attached to the roll film attachment portion 220 so as to be rotationally driven about a rotation shaft 223. The axial direction of the rotation shaft 223 is a direction perpendicular to the paper surface.

  A fastening film F is wound around the reel 221 in a roll shape. As the fastening film F, a polymer resin film can be used. For example, polyimide film, polypropylene film, polyester film, polyphenylene sulfide film, aramid film, Kapton film, vinyl chloride film, silicone glass tape, Teflon tape Mylar tape, polyethylene film, polyamide film and the like can be employed. The width of the fastening film F is smaller than the height of the fuel cell stack 100. In this case, the fastening film F is wound in a bandage around the fuel cell stack 100. However, a fastening film F having a width substantially equal to the height of the fuel cell stack 100 may be used.

  The stack mounting portion 230 is provided with a bearing portion 231. A rotation shaft 232 that can be driven to rotate by a motor is attached to the bearing portion 231. The axial direction of the rotating shaft 232 is a direction perpendicular to the paper surface, similarly to the rotating shaft 223 of the roll film mounting portion 220. The fuel cell stack 100 is attached to the stack attachment portion 230 by fitting the rotating shaft 232 into the fitting recess 28 provided on the bottom surface of the fuel cell stack 100. The fuel cell stack 100 is rotationally driven around the bearing portion 231 while being attached to the rotating shaft 223.

  With this configuration, as shown in the drawing, the fastening film F of the reel 221 is wound around the entire side surface of the fuel cell stack 100 while rotating the fuel cell stack 100. Note that the fuel cell stack 100 can be attached to the rotary shaft 223 in the axial direction, and the attachment position can be adjusted in the axial direction. Even when the height of the fuel cell stack 100 and the roll width of the fastening film F do not match. It is possible to wind while adjusting the winding position of the fastening film F.

  FIG. 3 is a schematic perspective view showing the fuel cell stack 100A in a state where the fastening film F is wound. Thus, the side surface of the fuel cell stack 100A is covered with the fastening film F. In addition, it is preferable that the fastening film F has transparency, and it is preferable that the side surface portion of the fuel cell stack 100A can be visually recognized even when the fastening film F is wound. This is because, for example, when the fuel cell stack 100A is damaged or deteriorated, such as a displacement of the constituent members, it can be visually confirmed.

  Moreover, it is preferable that the fastening film F has adhesiveness on the surface. This is because the fastening force by the fastening film F is improved. Furthermore, it is preferable that the fastening film F has air permeability. This is because even if the reaction gas leaks from the fuel cell stack 100A, the fastening film F can prevent the leakage gas from diffusing to the outside. In addition, if the state is covered with the fastening film F in this way, the heat retention of the fuel cell stack 100A is improved. Accordingly, the startability is improved when the fuel cell stack 100A is operated in a low temperature state (for example, below freezing point).

  FIG. 4 is a schematic cross-sectional view of the fuel cell stack 100A taken along the line 4-4 shown in FIG. However, in FIG. 4, illustration of the internal structure of the fuel cell stack 100 is omitted. As shown in the figure, the shaft portion 31 of the fastening member 30 is covered with the fastening film F together with the laminate 10. As described above, if the shaft portion 31 of the fastening member 30 is housed in the circumscribed rectangular portion 11 provided in the stacked body 10, an increase in volume caused by providing the fastening member in the fuel cell stack can be suppressed. The fuel cell stack can be reduced in size.

  Thus, according to the configuration of the present embodiment, the fastening force of the constituent members of the fuel cell stack can be easily improved by the fastening film.

B. Second embodiment:
FIG. 5 is a schematic cross-sectional view showing a configuration of a fuel cell stack 100B as a second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view similar to FIG. 4, but the following points are different due to the difference between the configuration of the fuel cell stack 100B of the second embodiment and the configuration of the fuel cell stack 100A of the first embodiment. Yes.

  As can be understood by comparing FIG. 5 and FIG. 4, the circumscribed rectangular portion 11 is not provided on the side surface of the stacked body 10 </ b> B of the fuel cell stack 100 </ b> B. The two end plates 21B and 22B of the fuel cell stack 100B are configured so that the outer periphery thereof is larger than the outer periphery of the stacked body 10B. The fastening member 30 is provided between the outer peripheral edge of the laminated body 10B and the outer peripheral edges of the two end plates 21B and 22B. That is, the fastening member 30 is provided outside the fastening film F.

  Unlike the fuel cell stack 100A of the first embodiment, the fuel cell stack 100B is manufactured by the following steps. The fuel cell stack 100B is attached to the fastening film winding apparatus 200 (FIG. 2) without being fastened by the fastening member 30 after the laminated body 10B is sandwiched between the two end plates 21B and 22B in the stacking direction. At this time, the stacked body 10B and the two end plates 21B and 22B are attached in a state where a load is applied in the stacking direction. In this state, after the fastening film F is wound around the side surface of the laminate 10B as in the first embodiment, the fastening member 30 is attached to the two end plates 21B and 22B, and a fastening load is applied to the fuel cell stack 100B. .

  Even in the configuration of the fuel cell stack 100B, the fastening force of the fuel cell stack can be improved by the fastening film, as in the first embodiment. However, as can be understood from the above description, as compared with the fuel cell stack 100A of the first embodiment, the fuel cell stack 100B has an outer periphery of the fastening member 30 and the end plates 21B and 22B outside the fastening film F. The stack volume increases as much as there is. Therefore, when the fuel cell stack is downsized, the fuel cell stack 100A of the first embodiment is preferable.

C. Third embodiment:
In the third embodiment of the present invention, instead of the fastening film F used in the first embodiment, a dye-coated fastening film FP in which a pressure-sensitive dye (described later) is applied to the surface of the fastening film F is used as a fastening member. The fuel cell stack 100 in the following description is the same as that described in the first embodiment (FIG. 1).

  6A to 6C are schematic views for explaining a process of applying a pressure-sensitive paint to the fastening film F. FIG. Here, the “pressure-sensitive dye” is a dye having luminescence such as fluorescence or phosphorescence, and means a dye having a property that the luminescence intensity is lowered by oxygen molecules in the air. That is, the pressure-sensitive dye is a dye that changes the intensity of light emitted according to the oxygen concentration (oxygen partial pressure) in the vicinity of the application region.

  In the first step, the pressure sensitive dye P is dissolved in the binder B which is a binder for fixing the dye to the object surface (FIG. 6A). As the pressure-sensitive dye P, pyrene, perylene, malachite green lactone, polyfolactone / pyrrolopyrrole ale, polyfin, 1,3-dichloro-fluorobenzene, bathophenanthroline / ruthenium, or the like can be used. Further, as the binder B, a high oxygen permeable polymer such as polydimethylcyclohexane, a room temperature curable silicon polymer, and a glass polymer can be employed.

  In the second step, the pressure-sensitive paint PP obtained in the first step is injected into the air gun 300 (FIG. 6B). In the third step, the pressure-sensitive paint PP is sprayed and applied. FIG. 6C shows a state in which the third step is performed using the fastening film winding apparatus 200. In this third step, first, a take-up reel 235 similar to the reel 221 of the roll film attachment portion 220 is attached to the stack attachment portion 230 of the fastening film winding device 200 in advance. The take-up reel 235 is rotated by the rotating shaft 232 and the fastening film F of the reel 221 is taken up on the take-up reel 235. At this time, as shown in the figure, while the fastening film F moves from the reel 221 to the take-up reel 235, the pressure sensitive paint PP is sprayed onto the surface of the fastening film F by the air gun 300. As a result, a film with a thickness of several tens of μm is formed on the surface of the fastening film F, and the dye-coated fastening film FP wound around the take-up reel 235 can be obtained.

  FIG. 7A is a schematic diagram showing a process of winding the dye-coated fastening film FP around the side surface of the fuel cell stack 100. FIG. FIG. 7A is substantially the same as FIG. 2 except that the reel 235 around which the dye-coated fastening film FP described in FIG.

  FIG. 7B is a schematic perspective view showing the fuel cell stack 100C obtained by this process. It is substantially the same as FIG. 3 except that the dye-coated fastening film FP is wound instead of the fastening film F. In this fuel cell stack 100C, since the side surface is covered with the dye-coated fastening film FP, the same effect as that of the fuel cell stack 100A of the first embodiment can be obtained. Further, in the fuel cell stack 100C, as described below, the dye-coated fastening film FP functions as a leaked gas inspected portion for inspecting whether or not the reactant gas leaks to the outside of the fuel cell. Therefore, the fuel cell stack 100C can be easily detected (detected) even when the reactant gas leaks.

  FIGS. 8A and 8B are schematic diagrams for explaining the detection process of the reaction gas leakage by the dye-coated fastening film FP. 8A and 8B are schematic cross-sectional views showing an enlarged part of the side surface of the fuel cell stack 100C. Specifically, the membrane electrode assembly 50 and the separator 60 constituting the laminate 10 are alternately laminated, and the contact interface is covered with the dye-coated fastening film FP. As described above, the dye-coated fastening film FP has a structure in which a thin film made of the pressure-sensitive paint PP is formed on the outer surface of the fastening film F. In addition, a seal portion having a seal line or the like is provided on a contact surface of the membrane electrode assembly 50 with the separator 60 to suppress leakage of fluid to the outside of the fuel cell.

  FIG. 8A shows a normal state in which no leakage of the reaction gas occurs. As shown in the figure, in this normal state, the pressure-sensitive paint PP of the dye-coated fastening film FP emits fluorescence corresponding to the oxygen partial pressure of the outside air. FIG. 8B shows a state in which a reactant gas leaks in the fuel cell stack 100C. Specifically, due to deterioration of the constituent members, hydrogen moves from the contact interface between the membrane electrode assembly 50 and the separator 60 to the outside of the laminated body 10, and passes through the dye-coated fastening film FP to the outside of the stack. Hydrogen is leaking (arrow L). As shown in the figure, in this case, due to the leakage of the reaction gas, the oxygen concentration in the vicinity of the leakage portion is locally reduced. Therefore, the light emission amount of the pressure-sensitive dye applied to the dye-coated fastening film FP increases against the decrease in the oxygen concentration. By detecting the increase in the light emission amount of the pressure-sensitive dye, it is possible to detect the reaction gas leakage of the fuel cell stack 100C.

  FIG. 9 is an explanatory diagram for explaining a reaction gas detection step of the fuel cell stack 100C. When the amount of leaked gas is very small, it may be difficult to detect a change in the light emission amount of the pressure-sensitive dye visually. In this case, as shown in the figure, the LED light source unit 400 irradiates the fuel cell stack 100C with LED light, and the CCD camera 500 can be used to identify the leak location. Specifically, an image obtained by the CCD camera 500 is transmitted to a connected computer 510 to perform image processing, and an image showing the pressure distribution of oxygen corresponding to the amount of luminescence on the surface of the dye-coated fastening film FP. create. As a result, it is possible to easily detect the leakage of the reactive gas and specify the leakage location. Therefore, if this fuel cell stack 100C is used, it is possible to omit sensors and systems such as a gas sensor for detecting leakage of the reaction gas.

  Thus, according to the structure of 3rd Example, while the fastening force of fuel cell stack 100C can be improved with the pigment | dye application | coating fastening film FP, the detection of the leakage of a reactive gas can be performed easily.

D. Fourth embodiment:
FIG. 10 is a schematic cross-sectional view showing the configuration of a fuel cell stack 100D as a fourth embodiment of the present invention. FIG. 10 shows an enlarged part of the side surface of the fuel cell stack 100D as in FIG. 8A. This fuel cell stack 100D includes the fuel cell stack 100C of the third embodiment. A different configuration is provided with a leaked gas inspected portion coated with a pressure sensitive dye.

  In the stacked body 10D of the fuel cell stack 100D, the membrane electrode assemblies 50 and the separators 60 are alternately stacked. The separator 60 is a two-layer separator including an anode plate 61 disposed on the anode side of the membrane electrode assembly 50 and a cathode plate 62 disposed on the cathode side. Note that the separator 60 may be a multilayer separator having a plurality of plates. The anode plate 61 is configured such that the outer periphery thereof is smaller than the outer periphery of the cathode plate 62 and the outer periphery of the membrane electrode assembly 50. As a result, a rectangular recess 15 is formed on the side surface of the laminate 10D for each contact interface between the anode plate 61 and the membrane electrode assembly 50. The pressure-sensitive paint PP is applied to the outer wall (including the wall surface of the rectangular recess 15) that constitutes the side surface of the laminate 10. Furthermore, the fastening film F is wound around the side surface of the laminate 10D so as to cover the entire side surface.

  Here, in this fuel cell stack 100D, it is assumed that hydrogen leaks through a path indicated by an arrow L shown in the drawing. Then, the oxygen concentration in the space surrounded by the wall surface of the rectangular recess 15 and the fastening film F decreases, and the light emission amount of the pressure-sensitive paint PP applied to the wall surface of the rectangular recess 15 increases. Therefore, like the fuel cell stack 100C of the third embodiment, this fuel cell stack 100D can detect hydrogen leakage. In addition, in this fuel cell stack 100D, the amount of light emitted from the rectangular recess 15 in which hydrogen leakage has occurred increases, so that it is easy to identify the location where hydrogen leakage has occurred. Therefore, the stack repair operation can be quickly processed. That is, in this fuel cell stack 100D, it can be interpreted that the rectangular recess 15 in which the pressure-sensitive paint PP is applied to the wall surface functions as a leakage gas inspection part.

  11A to 11C are explanatory views for explaining a manufacturing process of the fuel cell stack 100D. FIG. 11A shows a process of forming the laminated body 10D by alternately laminating the membrane electrode assembly 50 and the separator 60, and sandwiching the laminated body 10D between the two end plates 21 and 22. Yes. The outer peripheral sizes of the two end plates 21 and 22 are the same as the outer peripheral sizes of the membrane electrode assembly 50 and the cathode plate 62 of the separator 60. The laminated body 10D is provided with a circumscribed rectangular portion 11 for providing a fastening member.

  FIG. 11B shows a step of applying the pressure-sensitive paint PP to the side surface of the laminate 10D with the air gun 300. The pressure sensitive paint PP and the air gun 300 are the same as those described in the second embodiment (FIGS. 6A and 6B). The pressure-sensitive paint PP does not need to be applied to the entire wall surface constituting the side surface of the laminate 10D, and is preferably applied to at least a part of the wall surface of the rectangular recess 15.

  FIG. 11C shows the completed fuel cell stack 100D. Similar to the fuel cell stack 100 of the first embodiment, the laminate 10D and the two end plates 21 and 22 are fastened by the fastening member 30, and the fastening film F is wound around the side surface of the laminate 10D in a bandage shape. Is covered.

  As described above, according to the fuel cell stack 100D of the fourth embodiment, it is possible to configure a reaction gas leakage detector with higher accuracy than the fuel cell stack 100C of the third embodiment with a simple configuration.

E. Variation:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

E1. Modification 1:
In the first and second embodiments, a polymer film having transparency, air permeability, and adhesiveness is used as the fastening film F. However, the fastening film F may be another member. For example, a cloth may be wound around the side surface of the fuel cell stack 100 in a bandage shape. Even with such a configuration, the fastening force of the fuel cell stack 100 can be improved.

E2. Modification 2:
In the third and fourth embodiments, the leaky gas inspected portion is provided for the polymer electrolyte fuel cell having the laminate 10, but the pressure sensitive dye is used for other various fuel cells. It is also possible to provide a leaked gas inspection part to which is applied.

E3. Modification 3:
In the third embodiment and the fourth embodiment, the fastening film F may be omitted. For example, a configuration in which a pressure-sensitive dye is applied in the vicinity of the contact interface between the membrane electrode assembly 50 and the separator 60 may be employed.

The schematic perspective view for demonstrating the structure of a fuel cell stack. Explanatory drawing for demonstrating the winding process of the fastening film to a fuel cell stack. The schematic perspective view which shows the fuel cell stack by which the fastening film was wound. The schematic sectional drawing for demonstrating the structure of a fuel cell stack. The schematic sectional drawing for demonstrating the structure of the fuel cell stack of 2nd Example. Explanatory drawing for demonstrating the pressure-sensitive paint application process of 3rd Example. Explanatory drawing for demonstrating the winding process of the fastening film which apply | coated the pressure sensitive pigment | dye. Explanatory drawing for demonstrating the detection of the leakage of the reactive gas outside the stack. Explanatory drawing for demonstrating the detection of the leakage of the reactive gas outside the stack. The partially expanded schematic sectional drawing for demonstrating the structure of the fuel cell stack of 4th Example. Explanatory drawing for demonstrating the manufacturing process of the fuel cell stack of 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10B, 10D ... Laminated body 11 ... circumscribed rectangular part 15 ... rectangular recessed part 21, 22, 21B, 22B ... end plate 24 ... four corners 25 ... center part 28 ... fitting recessed part 30 ... fastening member 31 ... shaft part 32 ... nut Part 50: Membrane electrode assembly 60 ... Separator 61 ... Anode plate 62 ... Cathode plate 100, 100A, 100B, 100C, 100D ... Fuel cell stack 200 ... Fastening film winding device 210 ... Base part 220 ... Roll film attachment part 221 ... Reel 223 ... Rotating shaft 230 ... Stack mounting portion 231 ... Bearing portion 232 ... Rotating shaft 235 ... Winding reel 300 ... Air gun 400 ... LED light source unit 500 ... CCD camera 510 ... Computer B ... Binder F ... Fastening film FP ... Dye coating Fastening film P ... Pressure sensitive dye PP ... Pressure sensitive paint

Claims (4)

A fuel cell,
Equipped with a leaked gas inspected part for inspecting the presence or absence of reactant gas leakage to the outside of the fuel cell,
A fuel cell in which the leaked gas inspection part is coated with a pressure sensitive dye whose light emission amount changes according to the oxygen concentration. The fuel cell according to claim 1, further comprising:
Provided with a laminate in which membrane electrode assemblies and separators are alternately laminated,
The leak gas inspection portion is a fuel cell provided on a side surface of the laminate. The fuel cell according to claim 2, wherein
The leaked gas inspection part has a film-like member having the pressure-sensitive dye applied on the surface thereof,
The fuel cell, wherein the film-like member is wound so as to cover a side surface of the laminate. The fuel cell according to claim 2, wherein
The separator has a plurality of plate-like members including an anode plate disposed on the anode side of the membrane electrode assembly,
On the side surface of the laminate, a recess is provided by providing the outer periphery of the anode plate smaller than the outer periphery of the other plate-shaped member,
The leak gas inspection portion has a pressure-sensitive dye layer including the pressure-sensitive dye formed in the recess.

Images