JP2010040487A - Fuel battery, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel battery and a manufacturing method therefor, capable of achieving positioning of fuel battery cells in a short time and in high accuracy. <P>SOLUTION: The fuel battery has: a fuel battery cell stack in which fuel battery cells each including a membrane electrode assembly (MEA) 530 and separators 510 to pinch the MEA from both sides are stacked; moles 500 arranged between the separator and the MEA, each being a bent strip of which the base part is fixed to the separator and the top end is in contact with the MEA; and positioning reference bodies 541, 542 which include a pair of opposed plane bodies surrounding the fuel battery cell stack. The mole is in contact with the MEA as it bends from the base part to the top end in the same direction in the same angle against the face of the separator, and is deformed so that its angle may become small by a tightening force at the time of tightening of the fuel cell stack, without sliding on the MEA thanks to the friction force by contact, thereby, generates a relative propulsion force to the MEA and the separator, thereby the MEA and the separator abut the positioning reference bodies and are respectively aligned in position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel cell and a manufacturing method thereof.

  In recent years, fuel cells have attracted attention in response to social demands and trends against the background of environmental problems. A fuel cell has a laminated structure of fuel cells composed of a membrane electrode assembly (MEA) and a separator, and high accuracy is required for positioning of the fuel cells.

  Regarding the invention for positioning a fuel cell, a notch is provided on at least one side of each fuel cell forming the same side surface of the fuel cell, and the notch is brought into contact with a fixed guide post to There is a method of laminating (Patent Document 1).

However, since the membrane / electrode assembly is easily peeled and damaged, the above-described invention has a problem that positioning cannot be performed with high accuracy in a short time.
JP 2000-48849 A JP-A-2005-71869 JP 2006-318772 A JP 2006-147460 A

  The present invention has been made to solve such a problem, and uses a fastening force at the time of fastening of the fuel cell stack to generate a propulsive force in the membrane electrode assembly and the separator, thereby positioning reference bodies respectively. The fuel cell is positioned in a short time and with high accuracy.

  In order to solve the above problems, a fuel cell according to the present invention includes a fuel cell stack in which a plurality of fuel cell cells each including a membrane electrode assembly and a separator sandwiching the membrane electrode assembly from both sides are stacked, and a fuel cell A plurality of moldings having a bent piece disposed between the separator of the cell and the membrane electrode assembly, the base portion being fixed to the separator and the tip contacting the membrane electrode assembly, and at least one set surrounding the fuel cell stack A plurality of moldings that contact the membrane electrode assembly by bending in the same direction at the same angle with respect to the surface of the separator from the base, and the plurality of moldings are in contact with the membrane electrode assembly. Propulsive forces in opposite directions are applied to the membrane electrode assembly and the separator by deforming the angle to be reduced by the fastening force when the fuel cell stack is fastened without sliding on the membrane electrode assembly by frictional force. Generate The number of membrane electrode assemblies and a plurality of separators, characterized in that the align each by impinging respectively on the positioning reference body.

  The fuel cell manufacturing method according to the present invention includes a membrane electrode of a fuel cell stack in which a plurality of fuel cells including a membrane electrode assembly and a sheet-shaped separator sandwiching the membrane electrode assembly from both sides are stacked. A method of manufacturing a fuel cell in which the positions of a joined body and a separator are respectively aligned, wherein the joined body and the separator are disposed between the separator and the membrane electrode assembly, the base is fixed to the separator, and the tip is at the same angle with respect to the surface of the separator. A fuel cell laminate in which a fuel cell laminate including a plurality of moldings each having a bent piece that is bent in the same direction and is in contact with the membrane electrode assembly is a fuel cell laminate including at least one pair of opposed planar bodies. When the laminated body is disposed so as to surround the laminated body and the laminated structure is fastened, the molding is deformed so that the angle does not slip on the membrane electrode assembly due to the frictional force caused by the contact, and the membrane electrode assembly and the separator are separated. And a laminated body fastening stage that generates thrusts in opposite directions with respect to the sensor and aligns the plurality of membrane electrode assemblies and the plurality of separators by abutting against the positioning reference bodies, respectively. To do.

  According to the fuel cell and the manufacturing method thereof according to the present invention, the positioning of the fuel cell can be realized in a short time and with high accuracy. Furthermore, it is possible to prevent the dynamic deviation of the fuel cell that may occur when the fuel cell stack is fastened or when the fuel cell is mounted on an automobile.

  Hereinafter, a fuel cell and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings, divided into first to third embodiments.

  Before describing these embodiments, the overall configuration of the fuel cell stack will be briefly described in order to facilitate understanding of the present invention. FIG. 1 is a perspective view showing an overall configuration of the fuel cell stack, and FIG. 2 is an enlarged view of a main part showing a cell structure of the fuel cell stack.

  As shown in FIG. 1, the fuel cell stack 1 includes a unit battery cell (hereinafter referred to as “fuel cell”) that generates an electromotive force by a reaction between an anode reaction gas (hydrogen in this specification) and a cathode reaction gas (oxygen in this specification). A predetermined number of cells 2) are laminated to form a laminated body 3. A current collector plate 4, an insulating plate 5, and an end plate 6 are disposed at both ends of the laminated body 3, and penetrates into the laminated body 3. The tie rod 7 is passed through the through hole (not shown), and a nut (not shown) is screwed to the end of the tie rod 7.

  In the fuel cell stack 1, the anode reaction gas, the cathode reaction gas, and the liquid medium (specifically, cooling water or hot water) are respectively formed in the flow channel grooves formed in the separators (not shown) of each fuel cell 2. The anode reaction gas supply port 8, the anode reaction gas discharge port 9, the cathode reaction gas supply port 10, the cathode reaction gas discharge port 11, the medium supply port 12, and the medium discharge port 13 to be circulated in the one end plate 6. Forming.

  The anode reaction gas is supplied from the anode reaction gas supply port 8, flows through the anode reaction gas supply channel groove formed in the separator, and is discharged from the anode reaction gas discharge port 9. The cathode reaction gas is supplied from the cathode reaction gas supply port 10, flows through the cathode reaction gas supply channel groove formed in the separator, and is discharged from the cathode reaction gas discharge port 11. The liquid medium is supplied from the medium supply port 12, flows through a medium supply channel groove formed in the separator, and is discharged from the medium discharge port 13.

  As shown in FIG. 2, the fuel battery cell 2 includes a membrane electrode assembly (hereinafter also referred to as MEA (membrane electrode assembly)) 14 and separators 15 disposed on both surfaces of the MEA 14. Hereinafter, the separator 15 disposed on the anode side of the MEA 14 is referred to as an anode separator 15A, and the separator 15 disposed on the cathode side is referred to as a cathode separator 15B.

  The MEA 14 includes, for example, a solid polymer electrolyte membrane 141 that is a polymer electrolyte membrane that allows hydrogen ions to pass through, an anode electrode 144A that is an anode composed of an anode catalyst layer 142A and a gas diffusion layer 143A, and a cathode that is a catalyst metal that is an electrode catalyst. It consists of a cathode electrode 144B as a cathode comprising a catalyst layer 142B and a gas diffusion layer 143B. The MEA 14 has a laminated structure in which a solid polymer electrolyte membrane 141 is sandwiched from both sides by an anode electrode 144A and a cathode electrode 144B.

  The separator 15 is formed by forming a thin conductive metal plate into a predetermined shape using a mold. As shown in the figure, the separator 15 has an uneven shape (so-called corrugated shape) in which convex portions 16 and concave portions 17 are alternately formed in an active region that contributes to power generation (region of the central portion in contact with the MEA 14). is doing.

The convex portion 16A and the concave portion 17A of the anode separator 15A arranged in contact with the anode electrode 144A side of the MEA 14 serve as a channel groove for flowing an anode reaction gas (hydrogen; H ₂ ) between the MEA 14 and the anode reaction gas channel. (Anode channel) 18 is formed. On the other hand, the convex portion 16B and the concave portion 17B of the cathode separator 15B disposed in contact with the cathode electrode 144B side of the MEA 14 serve as a channel groove for allowing the cathode reactive gas (oxygen; O ₂ ) to flow between the MEA 14 and the cathode reactive gas. A flow path (cathode flow path) 19 is formed.

  When hydrogen is passed through the anode reaction gas flow path 18 and oxygen is passed through the cathode reaction gas flow path 19, the hydrogen is converted into hydrogen ions by the catalytic action of the anode catalyst layer 142A to release electrons. The hydrogen ions that have released the electrons pass through the solid polymer electrolyte membrane 141. In the cathode catalyst layer 142B, hydrogen passing through the solid polymer electrolyte membrane 141 and electrons passing through an external circuit (not shown) react with oxygen to generate water. As a result, the anode electrode 144A becomes negative and the cathode electrode 144B becomes positive, and a DC voltage is generated between the anode electrode 144A and the cathode electrode 144B as shown in FIG.

Hereinafter, the fuel cell and the manufacturing method thereof according to the present invention will be described in detail by dividing the first embodiment to the third embodiment.
[First Embodiment]
FIG. 3 is a cross-sectional view showing the structure of the fuel cell according to the first embodiment of the present invention. FIG. 4 is a view showing the structure of the fuel cell constituting the fuel cell according to the first embodiment of the present invention and the molding installed in the fuel cell.

  FIG. 3 shows a cross-sectional view of a fuel cell in which a fuel cell stack in which a plurality of fuel cells are stacked in a stack case 320 is cut in a direction perpendicular to the stacking direction. FIG. As shown in FIG. 3, a molding 300 is disposed between the separator 310 and a membrane electrode assembly (not shown; hereinafter referred to as “MEA”). The stack case 320 is provided with a separator positioning reference body 321 and an MEA positioning reference body 322. The separator positioning reference body 321 and the MEA positioning reference body 322 are provided by projecting a part of the stack case 320 in a planar shape inside the case. The separator positioning reference body 321 and the MEA positioning reference body 322 may be formed on a part of the tension plate. The separator positioning reference body 321 and the MEA positioning reference body 322 are opposed to each other. As will be described later, the molding 300 uses the fastening force when the fuel cell stack is fastened to cause the separator 310 and the MEA to generate propulsion forces in opposite directions. Due to this propulsive force, each separator 310 abuts against the separator positioning reference body 321 and the relative positions thereof are aligned. On the other hand, each MEA hits the MEA positioning reference body 322, and the relative positions thereof are aligned.

  As shown in FIG. 4, the molding 400 has a base 400a and a tip 400b, and two moldings are provided between the separator 410 and the MEA 430. In order to effectively generate the mutually opposite propulsive forces in the separator 410 and the MEA 430 by the fastening force when the fuel cell stack is fastened, the moldings 400 provided on the two separators of one fuel cell respectively It is desirable that the surface is symmetrical with respect to the MEA 430. Thereby, it is possible to generate a propulsive force in the separator 410 and the MEA 430 more efficiently and reliably. The base 400a of the molding 400 is fixed to the separator, and the tip 400b is brought into contact with the MEA. The molding 400 generates a propulsive force in the surface direction of the separator 410 in all the separators 410 of the fuel cell stack using the fastening force when the fuel cell stack is fastened. At the same time, the molding 400 generates a propulsive force in the surface direction of the MEA 430 in the opposite direction to the propulsive force generated in each separator using the fastening force. That is, the molding 400 generates a relative driving force for the separator 410 and the MEA 430.

  The tip 400b of each molding in the fuel cell stack is bent at the same angle and in the same direction with respect to the separator surface. By doing so, a propulsive force in a common direction can be generated for all the separators 410, and a propulsive force in a common direction opposite to that can be generated for all the MEAs 430.

  FIG. 5 is an explanatory diagram for explaining a driving force generated in the separator and the MEA when the fuel cell stack of the fuel cell according to the first embodiment is fastened. FIG. 5A is a diagram showing a state of the fuel cell before the fastening, and FIG. 5B is a diagram showing a state of the fuel cell after the fastening.

  As shown in FIG. 5A, when the fuel cell stack is fastened, a fastening force (black arrow) in a direction opposite to the stacking direction of the fuel cell stack is applied to each separator 510. Each molding 500 is in contact with each MEA, and since the static frictional force between the tip of the molding and the MEA is large to some extent, the tip of the molding 500 does not slide on the MEA before and after fastening. Then, the fastening force generates a propulsive force (a white arrow in the left direction in the figure) in the MEA through the tip of the molding 500. At the same time, the fastening force deforms the molding 500 and generates a driving force (a white arrow in the right direction in the figure) in the separator 510. The driving force generated by the fastening force with respect to the MEA 530 and the driving force generated with respect to the separator 510 are opposite to each other. Here, it is preferable that the molding is an elastic body and the deformation is elastic deformation.

  As shown in FIG. 5B, after the fuel cell stack is fastened, each MEA 530 is brought into contact with the MEA positioning reference body 542 by the propulsive force described above to align the positions. In addition, the positions of the separators 510 are also aligned by abutting against the separator positioning reference body 541 by the above-described driving force.

  As described above, according to the fuel cell according to the first embodiment, since the positioning of the fuel cell is performed simultaneously with the fastening of the fuel cell stack, a process for positioning the fuel cell is unnecessary. In addition, the positioning of the fuel cell can be realized with high accuracy.

  In addition, it is possible to prevent a dynamic shift of the fuel cell that may occur when the fuel cell stack is fastened or when the fuel cell is mounted on an automobile.

  The molding is preferably made of an insulating member having insulating properties. Since the whole molding has an insulating property, a short circuit between the separators can be prevented even when the positional difference between the separators sandwiching the MEA is large. For example, the molding can be made of a polymer rubber.

  The molding may also serve as a lip seal for sealing fuel gas or LLC (Long Life Coolant) or an insulating member for insulating between fuel cells. Thereby, the manufacturing cost reduction of a fuel cell and process time reduction are further realizable.

  The molding, which is a component of the fuel cell according to the first embodiment, needs to be determined in shape and size in consideration of the stacking positioning accuracy of the fuel cells when the fuel cell stack is formed. Hereinafter, how to determine the shape and dimensions of the mall will be described.

  FIG. 6 is a view showing shapes and dimensions before and after deformation of the molding of the fuel cell according to the first embodiment. 6A shows the shape and dimensions of the molding 600 before deformation, and FIG. 6B shows the shape and dimensions of the molding 600 after deformation.

As described above, each molding 600 has a base 600a and a tip 600b, and the tip 600b is bent in the same direction at the same angle with respect to the surface of the separator from the base 600a. In FIG. 6A, the angle is indicated by θ ₁ . The angle theta ₁ mall 600 is bent to the plane of the separator from the base 600a in as shown in (A) of FIG. 6, by installing align the installation direction to the separators, the tip from the base of the separator It can be set as the state bent to the same direction at the same angle with respect to the surface.

L in FIG. 6 is the length from the base 600a to the contact point in contact with the MEA in the mall tip 600b. The angle of the molding 600 is deformed from θ ₁ to θ ₂ by the fastening force when fastening the fuel cell stack. At this time, since the tip 600b of the molding does not slide on the MEA, the relative positional change x between the separator to which the base 600a of the molding is fixed and the MEA in contact with the tip 600b of the molding is expressed by the following formula ( Given in 1).

  The relative position change x is a maximum value that can change the relative position of the separator and the MEA. Then, the relative position change x needs to be larger than the stacking positioning accuracy of the fuel cells. This is because if the relative position change x is smaller than the stack positioning accuracy of the fuel cell, the stack positioning accuracy of the fuel cell cannot be absorbed even if the separator and the MEA change the relative position to the maximum. Therefore, the length L from the base at the tip of the molding to the contact point that contacts the MEA needs to satisfy the following formula (2). By determining the shape and dimensions of the molding in this way, it becomes possible to increase the allowable amount of stacking positioning accuracy of the fuel cells, so that it is possible to reduce the equipment cost and the process time for stacking the fuel cells.

Here, s is the stacking positioning accuracy of the fuel cells.

  The static frictional force between the molding 600 and the MEA is desirably the same as the sliding resistance value between the MEA and the separator. This is because the positioning of the fuel cell is realized with high accuracy.

  In addition, it is desirable that the tip of the molding slide on the MEA after the MEA and the separator constituting the fuel battery cell contact the MEA positioning reference body and the separator positioning reference body, respectively. Thereby, after the fuel cell hits the positioning reference body, the collapse force of the molding can be surely released, and the positioning of the fuel cell can be realized with high accuracy and in a short time.

  The separator positioning reference body and the MEA positioning reference body in the first embodiment correspond to the positioning reference body of the present invention.

The effects of the fuel cell according to the first embodiment of the present invention will be described below.
-Positioning of fuel cells can be realized in a short time and with high accuracy.
-It is possible to prevent a dynamic displacement of the fuel cell that may occur when the fuel cell stack is fastened or when the fuel cell is mounted on an automobile.
-Tolerance of stacking positioning accuracy of fuel cells can be increased, and equipment cost and process time can be reduced.
-It is possible to prevent a dynamic displacement of the fuel cell that may occur when the fuel cell stack is fastened or when the fuel cell is mounted on an automobile.
-Even when the position difference between the separators sandwiching the MEA is large, a short circuit between the separators can be prevented.
[Second Embodiment]
FIG. 7 is a cross-sectional view showing the structure of the fuel cell according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that there are two separator positioning reference bodies and two MEA positioning reference bodies. Further, the direction in which the tip of the molding is bent is the direction in which the separator and the MEA abut against the two separator positioning reference bodies and the MEA positioning reference body, respectively. Hereinafter, the fuel cell according to the second embodiment will be described in detail, but the description common to the first embodiment described above will be omitted.

  As shown in FIG. 7, a plurality of moldings 700 are arranged between the separator 710 and the MEA (not shown). The stack case 720 is provided with a first separator positioning reference body 721a and a first MEA positioning reference body 722a facing each other, and a second separator positioning reference body 721b and a second MEA positioning reference body 722b facing each other. These four positioning reference bodies are provided by projecting a part of the stack case 720 in a planar shape inside the case. The molding 700 generates propulsion forces in opposite directions to the separator 710 and the MEA using the fastening force when the fuel cell stack is fastened. Due to this propulsive force, the respective separators 710 are aligned by simultaneously abutting against the first separator positioning reference body 721a and the second separator positioning reference body 721b. On the other hand, each MEA aligns its position by simultaneously abutting against the first MEA positioning reference body 722a and the second MEA positioning reference body 722b.

  A plurality of moldings 700 are provided between the separator 710 and the MEA. A plurality of moldings provided in each of the two separators of one fuel cell in order to effectively generate reverse propulsive forces in the separator 710 and the MEA by the fastening force when the fuel cell stack is fastened. 700 is preferably plane-symmetric with respect to the MEA. The molding 700 has its base fixed to the separator and the tip is brought into contact with the MEA. The molding 700 generates a propulsive force in the surface direction of the separator 710 in all the separators 710 of the fuel cell stack, using the fastening force when the fuel cell stack is fastened. At the same time, the mall 700 generates a propulsive force in the surface direction of the MEA in the direction opposite to the propulsive force generated in each separator, using the fastening force. That is, the molding 700 generates a relative driving force for the separator 710 and the MEA.

  The tip of each molding in the fuel cell stack is bent at the same angle and in the same direction with respect to the separator surface. By doing so, a propulsive force in a common direction can be generated for all the separators 710, and a propulsive force in a common direction opposite to that can be generated for all MEAs.

  The direction in which the tip of each molding 700 is bent is a direction in which each separator 710 abuts against two separator positioning reference bodies 721a and 721b at the same time, and each MEA abuts against two MEA positioning reference bodies 722a and 722b at the same time. For example, as shown in FIG. 7, the angle formed when each of the surfaces constituting the first MEA positioning reference body 722a and the second MEA positioning reference body 722b is extended is divided by 2 into the direction in which the tip of each molding 700 is bent. It is good also as a direction divided | segmented into (1).

  After the fuel cell stack is fastened, each MEA simultaneously abuts against the two planar MEA positioning reference bodies, ie, the first MEA positioning reference body 722a and the second MEA positioning reference body 722b, by the aforementioned propulsive force. These two sides are aligned with the positioning reference. At the same time, each of the separators simultaneously abuts against two planar separator positioning reference bodies, ie, the first separator positioning reference body 721a and the second separator positioning reference body 721b, by the propulsive force, so that the two sides of each separator are positioned as the positioning reference. Will be aligned.

  Thus, according to the fuel cell according to the second embodiment, positioning of the fuel cell can be realized with higher accuracy than the fuel cell according to the first embodiment.

  Here, the first separator positioning reference body in the second embodiment is positioned on one set of first planar bodies, and the second separator positioning reference body is positioned on the other set of first planar bodies. The reference body corresponds to one set of second planar bodies, and the second MEA positioning reference body corresponds to the other set of second planar bodies.

The fuel cell operating method according to the second embodiment of the present invention has the following effects in addition to the effects of the first embodiment.
-With respect to the first embodiment, the positioning of the fuel cell can be realized with higher accuracy.
[Third Embodiment]
FIG. 8 is a view showing a flowchart of a method of manufacturing a fuel cell according to the third embodiment of the present invention. Hereinafter, the manufacturing method of the fuel cell according to the third embodiment will be described in detail for each step.

[S800]
A positioning reference body is disposed around the fuel cell stack.

  The fuel cell stack is formed by stacking a plurality of fuel cells with a positional deviation within the positioning accuracy depending on the stacking apparatus. A molding is disposed between the separator of the fuel cell and the MEA. Since the mall is the same as that of the first embodiment or the second embodiment, the description thereof is omitted.

  FIG. 9 is a view showing a state in which a positioning reference body is arranged around the fuel cell stack. The positioning reference bodies 910a and 910b need to include at least one pair of opposed planar bodies. The positioning reference bodies 910a and 910b are disposed so as to surround the fuel cell stack 900 so that the planar bodies are parallel to the opposing side surfaces of the fuel cell stack 900.

  Here, FIG. 9 shows the positioning reference bodies 910a and 910b as a part of the jig 970 at the time of manufacturing the fuel cell stack, but the positioning reference bodies 910a and 910b are the first embodiment and the second embodiment. As with, it may be part of a stack case.

[S810]
Air is blown between the fuel cells.

  FIG. 10 is a diagram showing a state in which air 1070 is blown between fuel cells by blowing air 1070 into the fuel cell stack. As shown in FIG. 10, when air is blown between fuel cells, air 1070 flows between MEA 1030 and separator 1010, and the degree of contact between MEA 1030 and separator 1010 can be reduced. That is, the sliding resistance value between the MEA 1030 and the separator 1010 can be reduced.

[S820]
The fuel cell stack is fastened.

  In the previous step S810, air is blown between the fuel cells, and the laminated structure is fastened in a state where air is introduced between the MEA of the fuel cells and the separator. At the time of fastening, the molding 1000 deforms without sliding the MEA due to the frictional force due to contact with the MEA 1030, and the MEA 1030 and the separator 1010 generate propulsive forces in opposite directions. Each position is aligned by hitting.

  As described above, according to the third embodiment, the sliding resistance value between the MEA 1030 and the separator 1010 can be reduced. The ability to reduce the sliding resistance value means that the relative position change between the MEA 1030 and the separator 1010 can be caused with a small driving force. Therefore, the force that can be endured without deformation of the molding may be small, and as a result, the molding can be reduced in size, so that the output density of the fuel cell can be improved and the manufacturing cost can be reduced.

  Here, step S800 in the third embodiment corresponds to the laminate arrangement stage of the present invention, and steps S810 and S820 correspond to the laminate fastening stage.

The fuel cell manufacturing method according to the third embodiment of the present invention has the following effects in addition to the effects of the first embodiment and the second embodiment.
-Since the molding can be reduced in size, the output density of the fuel cell can be improved and the manufacturing cost can be reduced.

It is a perspective view which shows the whole structure of a fuel cell stack. It is a principal part enlarged view which shows the cell structure of a fuel cell stack. It is sectional drawing which shows the structure of the fuel cell which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the fuel cell which comprises the fuel cell which concerns on 1st Embodiment of this invention, and the molding | mall installed in the fuel cell. It is explanatory drawing for demonstrating the driving force which generate | occur | produces in a separator and MEA when the fuel cell laminated body of the fuel cell which concerns on 1st Embodiment is fastened. It is a figure which shows the shape and dimension before and behind a deformation | transformation of the molding of the fuel cell which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the fuel cell which concerns on 2nd Embodiment of this invention. It is a figure which shows the flowchart of the manufacturing method of the fuel cell which concerns on 3rd Embodiment of this invention. It is a figure which shows the state which has arrange | positioned the positioning reference body around the fuel cell laminated body. It is a figure which shows the state by which air was blown between the fuel cell cells by blowing air in a fuel cell laminated body.

Explanation of symbols

1 Fuel cell stack,
2 fuel cells,
300, 400, 600, 700, 1000 malls,
310, 410, 510, 710, 1010 separator,
320, 720 stack case (positioning reference body),
321, 541 Separator positioning reference body (positioning reference body),
322, 542 MEA positioning reference body (positioning reference body),
430, 530, 1030 MEA,
721a first separator positioning reference body (positioning reference body, first planar body),
721b second separator positioning reference body (positioning reference body, second planar body),
722a first MEA positioning reference body (positioning reference body, first planar body),
722b second MEA positioning reference body (positioning reference body, second planar body),
900 fuel cell stack,
910a, 910b positioning reference body (positioning reference body),
1070 Air.

Claims (9)

A fuel cell stack in which a plurality of fuel cells including a membrane electrode assembly and a separator that sandwiches the membrane electrode assembly from both sides are stacked; and
A plurality of moldings arranged between the separator of the fuel cell and the membrane electrode assembly, having a bent piece whose base is fixed to the separator and whose tip is in contact with the membrane electrode assembly;
A positioning reference body including at least one pair of opposed planar bodies surrounding the fuel cell stack,
The plurality of moldings are bent in the same direction at the same angle with respect to the surface of the separator from the base and contact with the membrane electrode assembly, and on the membrane electrode assembly by a frictional force due to the contact. By deforming the angle to be reduced by the fastening force when the fuel cell stack is fastened without slipping, the membrane electrode assembly and the separator are generated in a mutually opposite direction, and a plurality of the thrusts are generated. A fuel cell, wherein the membrane electrode assembly and the plurality of separators abut each other on the positioning reference body to align the positions.   The length from the base of the tip of the molding to the contact point in contact with the membrane electrode assembly is obtained by subtracting the cosine value of the angle before the deformation from the cosine value of the angle after the deformation. 2. The fuel cell according to claim 1, wherein the calculated value is larger than a value obtained by dividing the positioning accuracy of the stack of fuel cells.   3. The fuel cell according to claim 1, wherein a static frictional force caused by contact between a tip of the molding and the membrane electrode assembly is the same as a sliding resistance value between the separator and the membrane electrode assembly. 4. .   The tip of the molding is slid with respect to the membrane electrode assembly after either the membrane electrode assembly or the separator hits the positioning reference body. Fuel cell.   The molding disposed between the separator of the fuel cell and the membrane electrode assembly is plane-symmetric with respect to the membrane electrode assembly. Fuel cell. The positioning reference body includes two sets of opposing first and second planar bodies,
The bending direction of the ends of the plurality of moldings is such that a plurality of the membrane electrode assemblies hit one of the two sets of first planar bodies and the other pair of second planar bodies. The plurality of separators are in a direction in which the plurality of separators are aligned by abutting against one of the two sets of the second sheet and the other set of the first sheet. The fuel cell according to any one of claims 1 to 5.   The fuel cell according to claim 1, wherein the molding has an insulating property. The positions of the membrane electrode assembly and the separator are aligned in a fuel cell stack in which a plurality of fuel cells including a membrane electrode assembly and a sheet-shaped separator that sandwiches the membrane electrode assembly from both sides are stacked. A fuel cell manufacturing method comprising:
Folded between the separator and the membrane electrode assembly, the base is fixed to the separator, and the tip is bent in the same direction at the same angle with respect to the surface of the separator and is in contact with the membrane electrode assembly. A stack arrangement step of arranging the fuel cell stack including a plurality of moldings having bent pieces so that a positioning reference body including at least one pair of opposed planar bodies surrounds the fuel cell stack;
By fastening the fuel cell stack, the molding is deformed so that the angle is reduced without sliding on the membrane electrode assembly due to the frictional force due to the contact, and the membrane electrode assembly and the separator are mutually connected. A laminate fastening stage that generates a driving force in the opposite direction and aligns the plurality of membrane electrode assemblies and the plurality of separators by abutting against the positioning reference bodies, respectively.
A fuel cell manufacturing method comprising:   The laminated body fastening step is characterized in that air is blown into the fuel cell laminated body and the laminated structure is fastened with the air flowing between the membrane electrode assembly of the fuel cell and the separator. The fuel cell manufacturing method according to claim 8.

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