JP2006032041A - Fuel cell, manufacturing method therefor, and separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell and a structure of its separator which are not curved or bent easily during manufacturing of the fuel cell, and a manufacturing method therefor. <P>SOLUTION: The fuel cell is equipped with a unit cell (C) including the separator (3) bonded adhesively with an adhesive (2), and a pressure receiving portion (34) on a part of an area of the separator (3), where the adhesive (2) is applied, wherein the pressure receiving portion (34) has a profile so that it can receive an equivalent pushing pressure as a pushing pressure received by the separator (3) on an electric power generation area (10) of the separator (3) at the time of adhesive bonding of the separator (3). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a preferred method for manufacturing a unit cell of a fuel cell and a structure suitable for the method.

In a fuel cell system, a fuel cell stack is formed by stacking a large number of unit cell fuel cell modules in order to obtain a high generated voltage. Unit cell is MEA including an electrolyte membrane (M embrane- E lectrode A ssembly) was sandwiched between a pair of separators.

  As a method for efficiently producing a large number of fuel cell modules, for example, in JP 2003-234119 A, a fluid adhesive is used for adhesion between fuel cell modules and between separators and MEAs. A technique is described in which a separator of a fuel cell module is sandwiched between plates for assembling a fuel cell module that directly presses from the outside and is pressurized by a pressurizing device such as a press device (Patent Document 1).

JP 2003-234119 A (paragraphs 0003, 0008, etc.) Japanese Patent Laid-Open No. 11-154522 JP-A-7-249417 Japanese Patent Laid-Open No. 2002-246044

However, in the case of the separator described in Patent Document 1, only a relatively small pressing force was applied to the periphery of the separator to which the adhesive was applied. For example, in the separator of Patent Document 1, the peripheral portion is only pressed by a point contact gasket.
If bonding is performed with a structure in which the pressing force is not easily applied to the peripheral portion of the separator in this way, the pressing force is not supplied to the peripheral portion of the separator during pressurization, so that the peripheral portion may be warped or bent. It was. Slight warping and bending of the separator hinder the recent thinning and multilayering of fuel cell unit cells.

  In addition, the conventional adhesive may be crushed during pressing, and such a change in the thickness of the adhesive during pressing causes the separator to warp or bend.

  When such a warp or bend of the separator occurs, there is a possibility of causing a change in the contact resistance due to poor sealing, generation of a high surface pressure locally, and damage to the separator.

  Then, an object of this invention is to provide the structure of the fuel cell and separator which suppress the curvature and bending at the time of manufacture, and its manufacturing method.

  In order to solve the above-described problems, the present invention provides a fuel cell comprising a unit cell assembled by applying an adhesive on the separator surface and pressing the membrane / electrode structure and the separator in a laminated state, from outside. Part of the region where the adhesive is provided is provided with a pressure receiving portion that receives a pressing force received by the separator from the outside, and the shape of the pressure receiving portion is the power generation region of the separator when the separator is bonded. It is formed in the shape which can receive the pressing force equivalent to the pressing force which a separator receives.

  The present invention is also a fuel cell comprising a unit cell assembled by applying an adhesive on the separator surface and pressing from outside in a state where the membrane / electrode structure and the separator are laminated, and the adhesive among the separators A pressure receiving portion that receives a pressing force that the separator receives from the outside is provided in a part of the region where the separator is applied, and the pressure receiving portion has a shape that is the same height as the height of the power generation region that performs the power generation action of the separator. It is characterized by being.

  Furthermore, the present invention is also a separator for a fuel cell laminated with a membrane / electrode structure and an adhesive, and a pressing force that the separator receives from the outside is applied to a portion of the separator where an adhesive is to be provided. A pressure receiving portion is provided, and the shape of the pressure receiving portion is formed in a shape capable of receiving a pressing force equivalent to the pressing force that the separator receives in the power generation region of the separator when the separator is bonded. It is characterized by being.

  Furthermore, the present invention is also a method of manufacturing a fuel cell in which a unit cell is assembled by applying an adhesive to a separator and pressing the separator from the outside. A pressing force equal to the pressing force applied to the separator is applied in the power generation region of the separator.

  Details and actions of the present invention as described above are as follows.

  The power generation region excluding the peripheral part of the separator is provided with a concavo-convex structure such as a flow path, and a pressing force is applied from a pressing device or the like when the separator is sandwiched between plates and bonded, but an adhesive is provided. The region (peripheral part or the like) is usually not formed with a concavo-convex shape for a special purpose such as a flow path. However, according to the above configuration of the present invention, a pressure receiving portion having a shape capable of receiving a pressing force equivalent to the pressing force that the power generation region receives from the plate or the like is provided in a part of the region where the adhesive is provided. Therefore, the same pressing force is applied even in the region where the adhesive is provided, and it is possible to prevent warping or bending from occurring when the separator is bonded.

  Here, the material and structure of the “separator” are not limited, but it is necessary that the pressure receiving portion is provided at least in the region where the adhesive is provided. Metal or carbon separators can be applied. Further, even when there is a frame of resin or the like used in combination with the separator, the present invention similarly prevents the occurrence of warping and bending.

  Here, the “membrane / electrode structure” includes all modules (such as MEA) that generate an electrochemical reaction during power generation and that show power generation action by being laminated with a separator. There is no limitation on the layer structure and order of the structure and the separator, and various changes can be made according to the specifications of the fuel cell.

  Although there is no limitation on the shape of the “pressure receiving portion”, for example, when the plate for applying the pressing force is a flat surface, in order to obtain a pressing force equivalent to the power generation region in which the flow path is provided, the pressure receiving portion is the shape of the power generation region, For example, it is conceivable that it is formed in an undulating structure such as a step, a rib, or a flange having a height equivalent to the height of the flow path.

  Here, for example, the pressure receiving part is provided in the peripheral part of the separator. Since the peripheral portion of the separator is provided not as a normal power generation region but as a region for bonding the separator, in such a separator, the pressure receiving portion is provided in the peripheral portion.

  For example, the pressure receiving part is provided at the edge of the manifold. The manifold provides an opening structure that vertically cuts the unit cell, and is arranged around the power generation area. If a pressure receiving part is provided at the edge of the manifold that becomes the opening structure, the area of the area where the adhesive is provided is provided. In the middle, it is possible to apply a pressing force equivalent to that in the power generation region, which is preferable.

  Here, the reaction force of the adhesive is preferably larger than the reaction force of the separator. According to such a configuration, when a pressing force is applied from the outside to the unit cell (separator) at the time of manufacture, a reaction force that causes warping or bending due to the pressing force is about to act on the separator. Because the reaction force of the adhesive exceeds that, it is possible to bond the separator without warping or bending.

  In particular, if an adhesive having such characteristics can be used, for example, even if the separator does not have a structure such as the pressure receiving portion, the reaction force of the separator can be overcome only by the reaction force of the adhesive. And bending can be prevented.

Here, the reaction force of the adhesive is a reaction force before curing of the adhesive at the time of bonding. In other words, in order to prevent warping and deflection from occurring due to the reaction force acting on the separator, the reaction force is sufficiently solidified after curing of the adhesive to suppress these reaction forces, as well as the pressing force before curing of the adhesive. This is because it is more preferable to suppress the reaction force of the separator that is generated when is applied.
The reaction force of the adhesive can be evaluated by the elastic force, viscosity, thixotropy index, etc. of the adhesive.

  As described above, according to the present invention, in the region where the adhesive for the separator is provided, the pressure receiving portion having a shape capable of receiving a pressing force equivalent to the pressing force received by the separator in the power generation region is provided. Sufficient pressing force is applied, and warping and bending are less likely to occur during manufacturing.

  Next, preferred embodiments of the present invention will be described with reference to the drawings. The following embodiments are merely examples for carrying out the present invention, and do not limit the scope of the invention. In the embodiment of the present invention, the present invention is applied to a unit cell of a fuel cell system used for an electric vehicle or the like.

(Embodiment 1)
First, the structure of the unit cell in the first embodiment will be described. FIG. 1 is a plan view of a unit cell C (separator 3) according to the first embodiment, and FIG. 2 is a cross-sectional view of the periphery of the unit cell C manufactured by the manufacturing method of the present invention (cross section taken along the line BB in FIG. Is an enlarged view of FIG.

  The fuel cell stack is formed by stacking a large number of unit cells C having a layer structure as shown in FIG. Each unit cell C is provided with a power generation region 10 in a middle area. The power generation region 10 of the separator 3 is provided with a flow path 30 that is an uneven structure for supplying a fuel gas such as hydrogen gas or oxidizing gas. A peripheral region 11 outside the power generation region 10 is a region where the adhesive layer 2 according to the present invention is provided. Further, in the peripheral region 11, the stacked unit cells C are vertically cut, and a coolant manifold 31, a hydrogen gas manifold 32, and an oxidizing gas manifold 33 are provided. A pressure receiving portion 34 according to the present invention is provided at the edge of each manifold. A pressure receiving portion 34 according to the present invention is also provided at the outermost peripheral edge portion of the peripheral region 11.

  As shown in FIG. 2, one unit cell C is configured by sandwiching a power generator 1 responsible for power generation of a fuel cell with a pair of separators 3 and sealing the periphery thereof with an adhesive layer 2. Specifically, the pair of separators 3 are bonded together by sealing the periphery of the power generator 1 with an adhesive 200 via a resin frame (gasket) 201.

As the power generator 1, in this embodiment, an MEA structure that is particularly suitable as a power generation source of an electric vehicle, that is, a laminate in which catalyst electrodes 102 and 103 each having a catalyst supported on a porous support layer are formed on both sides of a polymer electrolyte membrane 101. It shall have a structure. However, various other structures of the power generator 1 are conceivable depending on the fuel cell system. For example, a solid oxide fuel cell has a basic structure in which an electrolyte such as zirconia is sandwiched between a cathode electrode such as lanthanum manganite and an anode electrode such as nickel. In the case of a molten carbonate fuel cell, an electrolyte plate in which carbonate is impregnated in a holding material such as LiAlO ₂ is sandwiched between an anode electrode and a cathode electrode. In the case of a polymer electrolyte fuel cell, an electrolyte membrane containing a polymer electrolyte such as a fluorine-based ion exchange membrane is interposed between the anode electrode and the cathode electrode. Those having a sandwiched structure are applicable. The power generator 1 is formed by pressing an electrolyte membrane and an electrode by, for example, a hot press method.

  The separator 3 has a structure in which a flow path 30 is disposed on almost the entire surface of the power generation region 10 in order to supply oxidizing gas and hydrogen gas to the cathode electrode side and the anode electrode side of the power generator 1. There is no limitation on the material and structure of the separator, but it is composed of a stainless steel (SUS) flat body called a metal separator or a stainless steel surface obtained with a conductive material and a corrosion-resistant material, and a carbon and resin called a carbon separator. There are things. In particular, a metal material that is easy to process, such as aluminum, iron, titanium, stainless steel, etc., containing carbon is used.

In this embodiment, a metal separator is used. Such a metal separator is required to have a certain degree of elasticity for ease of processing. For example, the Young's modulus is 7 × 10 ¹⁰ Pa or more. Further, as physical resistance, it is necessary to withstand a temperature range in an environment of use, for example, −30 ° C. to + 120 ° C., and as chemical resistance, it is necessary to withstand an acidic atmosphere having a pH of 2 or more. The separator 3 has a thickness of about 0.05 to 0.3 mm, and is preferably 0.1 mm or less in order to stack a large number.

  In particular, in the peripheral region 11, the pressure receiving portions 34 according to the present invention provided at the edge of each manifold and the outermost peripheral edge of the separator 3 are pressed by the separator 3 in the power generation region 10 in the bonding process. It is formed in a shape capable of receiving a pressing force equivalent to the pressure, for example, a undulating structure such as a step, a rib, or a flange. Since the pressure receiving portion 34 receives a pressing force equivalent to the pressing force in the power generation region 10, the height h <b> 2 of the pressure receiving portion 34 from the surface of the power generation body 1 is equal to the height h <b> 1 of the flow path 30 in the power generation region 10. Of height. With such a structure, when the separator 3 is bonded with the adhesive 200, the pressure receiving portion 34 in the peripheral region 11 comes into contact with the plate almost simultaneously with the flow path 30 in the power generation region 10 in contact with the plate. A pressing force equivalent to the pressing force received by the flow path 30 is also applied to the pressure receiving portion 34. Therefore, it is possible to prevent the separator 3 from being warped or bent even in the peripheral region 11 where the adhesive 200 is provided.

  In the press working apparatus used in the present embodiment, the plate for abutting against the separator 3 and applying the pressing force has an area capable of abutting on all the pressure receiving portions 34, and the abutting surface is It is flat.

  The resin frame 201 is provided so that the power generator 1 and the pair of separators 3 are arranged in a correct positional relationship, and the gap between the pair of separators 3 is maintained at a predetermined value. The resin frame 201 is not an essential component of the present invention, and only the adhesive 200 may be filled in the peripheral region 11.

  In the present invention, the adhesive 200 that forms the adhesive layer 2 in order to bond the peripheral region 11 of the separator 3 has a reaction force before curing of the adhesive at the time of bonding larger than the reaction force of the separator. Of course, the reaction force of the adhesive after curing is greater than the reaction force of the separator. Details will be described later in the manufacturing process.

  The coolant seal member 4 is a seal member for coolant that flows outside the separator 3 (unit cell C), and is a foaming rubber having elasticity (for example, silicon rubber, butyl rubber, elastomer such as polymer material) A chemically resistant elastic member) is used. Although not shown in FIG. 1, the coolant seal member 4 is formed so as to surround the peripheral region of the separator 3.

(Manufacturing process)
Next, a method for manufacturing the unit cell C will be described with reference to FIGS. Although the drawing shows a case where two sets of unit cells C are manufactured using a press working apparatus, the number of unit cells that can be manufactured simultaneously is not limited. Assume that the power generator 1 uses MEA that has already been manufactured in a separate process.

  First, as shown in FIG. 3, for each of the pair of separators 3, the coolant seal member 4 is provided on the surface through which the coolant flows. As the coolant seal member 4, for example, an elastic member having chemical resistance such as silicon rubber, butyl rubber, or elastomer which is a polymer material is used. As an example, the elastic member is applied to a region that needs to be sealed from a supply device such as the dispenser 5, and heat treatment or drying treatment is applied as necessary. The height after the formation of the coolant seal member 4 is too high compared to the height of the pressure receiving portion 34 so that the pressing force applied to the pressure receiving portion 34 does not change. For example, when unit cells C are stacked, the height of the unit cell C is set to a level that does not cause a large reaction force while the cooling liquid can be sealed.

  Note that a predetermined adhesive such as silicone, isobutylene, or epoxy-modified silicone can be used as the coolant seal member 4 instead of the foamable rubber as described above.

  The step of forming the coolant seal member 4 may be performed after a press step described later. Further, the step of forming the coolant seal member 4 is an option, and can be omitted if the coolant is not required to be sealed.

  Next, as shown in the schematic view of FIG. 4, the power generator 1 is sandwiched between the anode-side separator 3A and the cathode-side separator 3C while being aligned. At this time, the adhesive 200 is filled with the resin frame 201 interposed so as to form the adhesive layer 2 as shown in FIG. As described above, the resin frame 201 is an option, and the power generator 1 may be directly sandwiched between the pair of separators 3 by filling only the adhesive 200.

  Here, the adhesive 200 has a reaction force larger than the reaction force of the separator 3 even before curing. When an adhesive exhibiting such characteristics is used, a pressing force is applied during manufacturing, and even if a reaction force acts on the separator 3 due to the pressing force, the reaction force of the adhesive 200 exceeds that. Therefore, it is possible to bond the separator without warping or bending.

  FIG. 7 shows how the thickness (average clearance) of the adhesive changes as the pressing force is applied from above the adhesive when a predetermined thickness of the adhesive is provided. . FIG. 7 shows the relationship between the pressing force and the average clearance for the two types of adhesives A and B. A smaller average clearance indicates that the adhesive is crushed. As can be seen from FIG. 7, the average clearance of the adhesive A is larger than that of the adhesive B when the same load is applied. That is, it shows that the adhesive A is less crushed against the load, and it can be said that the reaction force is larger than the adhesive B.

  In this embodiment, paying attention to the magnitude of the reaction force of the adhesive, an adhesive having a reaction force that pushes back the separator 3 with a reaction force larger than the reaction force that the separator 3 tries to warp during press processing is used. Such an adhesive should be appropriately selected according to the magnitude of the reaction force generated during press working. For example, any thermosetting adhesive may be used as long as the shape can be maintained before curing. Specifically, an adhesive whose reaction force Fa before curing of the adhesive is larger than the force Fw of the separator to warp is preferable, and generally a high viscosity is appropriate. The reaction force of the adhesive is determined in consideration of the material of the separator 3 itself and its thickness (determining the reaction force of the separator), clearance (thickness of the adhesive), total coating amount, and the like. For example, silicone, epoxy resin, epoxy-modified silicone, olefin, olefin-modified silicone, etc. can be used as the adhesive material. Generally, it is possible to increase the viscosity by mixing a plurality of materials such as a two-component adhesive.

  As shown in FIG. 5, the adhesive 200 selected in this way is filled between a pair of separators 3, and the power generator 1 is sandwiched between the plates 6. To narrow. When the gap between the plates 6 becomes sufficiently small, as shown in FIG. 6, the surface of the plate 6 comes into contact with the crests of the flow passages 30 of the separator 3 and the pressure receiving portions 34 provided in the peripheral region 11, and almost the same pressing force is applied to both. Pressure is applied.

  FIG. 8 shows the reaction force applied to the unit cell C during press working. When the plate 6 of the press working device is in contact with the separator 3, a force is generated in the separator 3 to cause warping or bending. This force can be considered when the separator 3 warps in the + Z direction (upward in FIG. 8) or when the separator 3 warps in the −Z direction (downward in FIG. 8).

  According to the present embodiment, the separator 3 is prevented from being warped or bent regardless of which reaction force is generated in any direction. That is, when a reaction force that tends to warp in the + Z direction occurs in the separator 3, the pressure receiving portion 34 comes into contact with the surface of the plate 6, and the peripheral region 11 receives a pressure equivalent to the pressing force in the power generation region 10. , Warpage in the + Z direction is prevented. Even if it warps in the + Z direction, the warping of the plate 6 is suppressed by the pressing force F <b> 1 received by the pressure receiving portion 34 from the plate 6.

  On the other hand, when a reaction force that tries to warp in the −Z direction is generated in the separator 3, the separator 3 tries to crush the adhesive 200. In this embodiment, the adhesive 200 overcomes this reaction force. Since a material having a strong reaction force is used, warpage in the -Z direction is also prevented. That is, the reaction force F2 from the adhesive 200 is exerted on the separator 3 even if it warps in the -Z direction, and the thickness of the adhesive 200 does not easily change, so that the warpage of the separator 3 in the -Z direction is also suppressed. .

  FIG. 6 shows a cross-sectional view when the maximum load is applied to the unit cell C. As shown in FIG. 6, warpage in the + Z direction is prevented by the contact of the pressure receiving portion 34, and warpage in the −Z direction is also prevented by the reaction force of the adhesive 200, so that the surface of the separator 3 is warped or bent. Has not occurred. In this state, energy is applied to the heater plate 7 for heating the plate 6 to heat the plate 6 to solidify the adhesive 200. If the adhesive 200 is solidified, the gap between the separators 3 is kept constant by the hardened adhesive 200 even if the pressing force of the press working is released. Therefore, the unit cell C without warping or bending of the separator 3 is maintained. Can be taken out.

(Embodiment 2)
Although Embodiment 1 is an example using a metal separator, Embodiment 2 relates to a carbon separator.
FIG. 9 shows a peripheral sectional view of the unit cell Cb using the carbon separator 3b in the second embodiment. The plan view is substantially the same as FIG. 1 in the first embodiment. As shown in FIG. 9, a pair of carbon separators 3b are bonded with an adhesive 200, and the power generator 1 is held between the carbon separators 3b.

  The carbon separator 3b is composed of carbon and resin. Also in the second embodiment, the pressure receiving portion 34 according to the present invention is provided in the peripheral region 11 at the edge of each manifold and the outermost peripheral edge of the carbon separator 3b. The height h <b> 2 of the pressure receiving portion 34 from the surface of the power generation body 1 has a height equivalent to the height h <b> 1 of the mountain of the flow path 30 in the power generation region 10. With such a structure, when the carbon separator 3b is bonded with the adhesive 200, the pressure receiving portion 34 in the peripheral region 11 also comes into contact with the plate almost simultaneously with the plate contacting the power generation region 10. Thus, a pressing force equivalent to the pressing force received at the step is also applied to the pressure receiving portion 34 in the peripheral region 11. Therefore, it is possible to prevent the carbon separator 3b from being warped or bent in the + Z direction (upward direction in FIG. 9) in the peripheral region 11 where the adhesive 200 is provided.

  Since the adhesive 200 is the same as that in the first embodiment, it is possible to prevent warping or bending in the −Z direction (downward in FIG. 9) as in the first embodiment.

  With the structure as described above, even when the carbon separator 3b according to the second embodiment is used, it is possible to prevent the carbon separator 3b from being warped or bent due to the same effect as that of the first embodiment at the time of pressing. .

(Other variations)
The present invention is not limited to the above embodiment, and can be applied with various modifications. For example, even when the conventional structure in which the pressure receiving portion 34 is not provided in the separator 3 is adopted, the same effect can be obtained by providing a convex structure (step structure) in the shape of the plate 6 of the press working apparatus. .

  For example, as shown in FIG. 10, the convex structure 61 having a height h4 similar to the height h3 of the crest in the separator 3c is provided at a position where it abuts on some of the peripheral areas 11 of the separator 3c. deep. If the unit cell having the conventional structure is pressed by the plate 6b having such a convex structure 61, the pressing force equivalent to the pressing force received in the power generation region 10 is also received in the peripheral region 11, so that the unit cell warps. Or bending can be prevented.

FIG. 2 is an overall plan view of a unit cell (separator) according to the first embodiment. Sectional drawing of the peripheral region 11 of the unit cell C of Embodiment 1 (BB sectional drawing of FIG. 1). The perspective view which shows a sealing member formation process. The perspective view which shows the lamination order in a hot press process. The perspective view which shows a hot press process. FIG. 3 is a cross-sectional view of a peripheral region of a unit cell in the hot press process according to the first embodiment. The characteristic view which shows the difference in the magnitude | size of the reaction force by an adhesive agent. The relationship figure of the reaction force of the adhesive agent at the time of pressing force application, and the reaction force of a separator. Sectional drawing of the unit cell Cb peripheral area | region 11 of Embodiment 2 (BB sectional drawing of FIG. 1). Sectional drawing of the peripheral area | region of the unit cell in the hot press process of a modification.

Explanation of symbols

C unit cell, 1 power generator (membrane / electrode structure), 2 adhesive layer, 3, 3A, 3C separator, 3b carbon separator, 4 coolant seal member, 5 dispenser, 6, 6b plate, 7 heater plate, 10 power generation Area, 11 peripheral area, 30 flow path, 31 manifold for cooling liquid, 32 manifold for hydrogen gas, 33 manifold for oxidizing gas, 34 pressure receiving part, 61 convex structure, 101 polymer electrolyte membrane, 102 catalyst electrode, 200 adhesive, 201 Resin frame, F1 pressing force, F2, Fa reaction force, Fw force

Claims (9)

In a fuel cell comprising a unit cell assembled by applying an adhesive on the separator surface and pressing from outside in a state where the membrane / electrode structure and the separator are laminated,
In the part of the region where the adhesive is provided in the separator, the separator includes a pressure receiving portion that receives a pressing force that the separator receives from the outside,
The fuel cell, wherein the pressure receiving portion is formed in a shape capable of receiving a pressing force equivalent to the pressing force received by the separator in the power generation region of the separator when the separator is bonded.   The fuel cell according to claim 1, wherein the pressure receiving portion is provided in a peripheral portion of the separator.   The fuel cell according to claim 2, wherein the pressure receiving portion is provided at an edge of the manifold.   The fuel cell according to claim 1, wherein a reaction force of the adhesive is larger than a reaction force of the separator.   The fuel cell according to claim 4, wherein the reaction force of the adhesive is a reaction force before curing of the adhesive at the time of bonding. In a fuel cell comprising a unit cell assembled by applying an adhesive on the separator surface and pressing from outside in a state where the membrane / electrode structure and the separator are laminated,
A pressure receiving portion that receives a pressing force that the separator receives from the outside is provided in a part of a region of the separator where the adhesive is applied,
The fuel cell according to claim 1, wherein the pressure receiving portion has a shape that is the same height as a height of a power generation region that performs a power generation action in the separator. A separator for a fuel cell laminated with a membrane / electrode structure and an adhesive,
A part of a region where the adhesive is to be provided in the separator is provided with a pressure receiving portion that receives a pressing force that the separator receives from the outside,
The separator is characterized in that the pressure receiving portion is formed in a shape capable of receiving a pressing force equivalent to the pressing force that the separator receives in the power generation region of the separator when the separator is bonded. . In the fuel cell manufacturing method, an adhesive is applied to the separator and the separator is pressed from the outside to assemble the unit cell.
A method of manufacturing a fuel cell, wherein a pressing force equivalent to a pressing force applied to the separator in a power generation region of the separator is applied to a part of the separator to which the adhesive is applied. The method of manufacturing a fuel cell according to claim 8, wherein a reaction force before curing of the adhesive during the bonding is greater than a reaction force of the separator.

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