Lamination jig for fuel cell and lamination method for fuel cell

Abstract

To facilitate lamination of a gas diffusion layer to an intermediate layer in a simple and efficient manner during a manufacturing stage of a fuel cell.SOLUTION: A lamination jig for a fuel cell includes a lower jig with an upper surface configured to allow an intermediate layer to be arranged thereon, and an upper jig with a lower surface configured to allow a gas diffusion layer to be arranged thereon. The lamination jig for a fuel cell is configured to be settable to a state for lamination that corresponds to a state in which the gas diffusion layer is arranged on the lower surface of the upper jig, the intermediate layer is arranged on the upper surface of the lower jig, and an adhesive is applied to at least one of an upper surface of the intermediate layer and a lower surface of the gas diffusion layer. The upper jig is lowered from the state for lamination to press the gas diffusion layer against the intermediate layer, thereby laminating the gas diffusion layer to the intermediate layer using the adhesive.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a jig and a method for bonding members constituting a fuel cell to each other.

Background Art

[0002] Some fuel cells include, in order from one side, a gas diffusion layer on the anode side, an intermediate layer, and a gas diffusion layer on the cathode side. When a fuel gas as a gas containing hydrogen is supplied to the gas diffusion layer on the anode side and an oxidizing gas as a gas containing oxygen is supplied to the gas diffusion layer on the cathode side, this fuel cell generates electricity.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present invention focused on the following problems in the manufacturing stage of such a fuel cell. Structurally, in a fuel cell, for one gas diffusion layer, it can be joined to the intermediate layer by hot pressing, but for the other gas diffusion layer, it may not be possible to join it to the intermediate layer by hot pressing. In this case, it is necessary to bond the other gas diffusion layer to the intermediate layer with an adhesive. At this time, it is preferable that the gas diffusion layer can be bonded to the intermediate layer as efficiently as possible.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to make it easy to efficiently bond a gas diffusion layer to an intermediate layer in the manufacturing stage of a fuel cell.

Means for Solving the Problems

[0006] The inventors of the present invention have found that by using a predetermined jig, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer, leading to the present invention. The present invention relates to the bonding jig for fuel cells of the following (1) to (6) and the bonding method for fuel cells of (7).

[0007] (1) A bonding jig for a fuel cell for bonding the gas diffusion layer to the intermediate layer in the manufacturing stage of a fuel cell including the intermediate layer and the gas diffusion layers on both sides thereof, including a lower jig configured such that the intermediate layer can be disposed on the upper surface thereof, and an upper jig configured such that the gas diffusion layer can be disposed on the lower surface thereof, configured to be set in a bonding state in which the gas diffusion layer is disposed on the lower surface of the upper jig, the intermediate layer is disposed on the upper surface of the lower jig, and an adhesive is applied to at least one of the upper surface of the intermediate layer and the lower surface of the gas diffusion layer, wherein when the upper jig is lowered from the bonding state to press the gas diffusion layer against the intermediate layer, the gas diffusion layer is bonded to the intermediate layer with the adhesive. Bonding jig for fuel cells.

[0008] According to this configuration, after setting to the above bonding state, the gas diffusion layer can be bonded to the intermediate layer with an adhesive simply by lowering the upper jig and pressing the gas diffusion layer against the intermediate layer. Therefore, compared with the case where such a bonding jig for fuel cells is not used, it becomes easier to efficiently bond the gas diffusion layer and the intermediate layer.

[0009] (2) The upper jig is attached to be vertically displaceable with respect to the lower jig via a guide shaft extending in the vertical direction. The bonding jig for fuel cells according to (1) above.

[0010] According to this configuration, the guide shaft makes it easier to correctly align the upper jig with respect to the lower jig. Also in this respect, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer. Furthermore, it becomes easier to bond the gas diffusion layer to the intermediate layer at the correct relative position with high accuracy.

[0011] (3) The upper jig is provided with an adsorption mechanism configured to be able to adsorb the gas diffusion layer. The upper jig is configured such that the gas diffusion layer can be disposed on the lower surface of the upper jig by adsorption by the adsorption mechanism. The bonding jig for a fuel cell according to (1) or (2) above.

[0012] According to this configuration, the gas diffusion layer can be disposed on the lower surface of the upper jig against gravity by adsorption by the adsorption mechanism. Also in this regard, it becomes easier to efficiently bond the gas diffusion to the intermediate layer.

[0013] (4) The lower jig is provided with a positioning recess for positioning the gas diffusion layer. The upper jig is configured to be able to adsorb the gas diffusion layer positioned in the positioning recess by the adsorption mechanism. The bonding jig for a fuel cell according to (3) above.

[0014] According to this configuration, after positioning the gas diffusion layer in the positioning recess in the lower jig, the gas diffusion layer can be disposed at a fixed position on the lower surface of the upper jig simply by adsorbing the gas diffusion layer to the lower surface of the upper jig. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer, and it becomes easier to bond them with high precision at the correct relative position.

[0015] (5) The lower jig is provided with a positioning portion for positioning the intermediate layer. The bonding jig for a fuel cell according to any one of (1) to (4) above.

[0016] According to this configuration, it becomes easier to dispose the intermediate layer at a fixed position on the lower surface of the upper jig by the positioning portion. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer, and it becomes easier to bond them with high precision at the correct relative position.

[0017] (6) The intermediate layer is larger than the gas diffusion layer. In the state of being used for bonding, a rib is provided which is configured to be attachable on a portion of the upper surface of the intermediate layer that does not face the gas diffusion layer. The bonding jig for a fuel cell according to any one of (1) to (5) above.

[0018] According to this aspect, the rib can suppress the undulation of the intermediate layer. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer, and it becomes easier to bond them at the correct relative position with high accuracy. Further, when the adhesive oozes out from between the gas diffusion layer and the intermediate layer to the rib, the adhesive adheres to the rib. Therefore, it is possible to prevent the adhesive from oozing out beyond the rib.

[0019] (7) A bonding method for a fuel cell in which, in the manufacturing stage of a fuel cell including an intermediate layer and gas diffusion layers on both sides thereof, the gas diffusion layer is bonded to the intermediate layer, preparing a jig including a lower jig configured to be able to dispose the intermediate layer on its upper surface and an upper jig configured to be able to dispose the gas diffusion layer on its lower surface, setting it to a bonding state in which the gas diffusion layer is disposed on the lower surface of the upper jig, the intermediate layer is disposed on the upper surface of the lower jig, and an adhesive is applied to at least one of the upper surface of the intermediate layer and the lower surface of the gas diffusion layer, pressing the gas diffusion layer against the intermediate layer by lowering the upper jig from the bonding state to bond the gas diffusion layer to the intermediate layer with the adhesive. A bonding method for a fuel cell.

[0020] Also by this method, similar to the case of the jig of (1) above, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer.

Advantages of the Invention

[0021] As described above, according to the bonding jig for fuel cells of (1) and the bonding method for fuel cells of (7), in the manufacturing stage of fuel cells, it becomes easier to efficiently bond the gas diffusion layer to the intermediate layer. Furthermore, according to the configurations of (2) to (6) that cite (1), respective additional effects can be obtained.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments at all, and can be appropriately modified and implemented without departing from the gist of the present invention.

[0024] [First Embodiment] The bonding jig 70 for fuel cells shown in FIG. 1 is a jig for manufacturing the fuel cell 40. Note that the bonding jig 70 for fuel cells may be simply read as "jig".

[0025] As shown in FIG. 9, the fuel cell 40 includes, in order from one side, a gas diffusion layer 20a on the anode side, an intermediate layer 30, and a gas diffusion layer 20c on the cathode side. Note that the intermediate layer 30 may be read as "UEA" or "unitized electrode assembly".

[0026] The intermediate layer 30 includes a resin film 32 and an electrolyte membrane 35. The resin film 32 is a film for protecting the edge portion of the electrolyte membrane 35. Specifically, the resin film 32 is composed of, for example, two films: a first resin film on the anode side of the electrolyte membrane 35 and a second resin film on the cathode side of the electrolyte membrane 35. A film window 32w for exposing a portion other than the edge portion of the electrolyte membrane 35 is formed in the resin film 32.

[0027] As shown in FIG. 9, each of the gas diffusion layers 20a, 20c includes a carbon paper 23 and a porous layer 26. The porous layer 26 is provided closer to the intermediate layer 30 than the carbon paper 23.

[0028] The intermediate layer 30 is larger by one size in plan view than the gas diffusion layer 20c. Therefore, the end portion of the intermediate layer 30 protrudes between the gas diffusion layers 20a, 20c. The gas diffusion layer 20a on the anode side is attached to the intermediate layer 30 by thermal pressing or the like. On the other hand, the gas diffusion layer 20c on the cathode side is attached to the intermediate layer 30 with an adhesive A.

[0029] Hereinafter, a gas containing hydrogen is referred to as a "fuel gas", and a gas containing oxygen is referred to as an "oxidizing gas". When the fuel cell 40 is in use, the electrodes on both sides of the intermediate layer 30, that is, the anode-side electrode and the cathode-side electrode, are electrically connected via a circuit including a power supply target. In this state, when a fuel gas is supplied to the gas diffusion layer 20a on the anode side and an oxidizing gas is supplied to the gas diffusion layer 20c on the cathode side, power generation occurs.

[0030] The bonding jig 70 for a fuel cell shown in FIG. 1 is a jig for bonding the gas diffusion layer 20c on the cathode side to the intermediate layer 30 in the manufacturing stage of the fuel cell 40 shown in FIG. 9 above. Hereinafter, the gas diffusion layer 20c on the cathode side will be simply referred to as the "gas diffusion layer 20c". This bonding jig 70 for a fuel cell shown in FIG. 1 includes an upper jig 50, a lower jig 60, a receiving plate 67 shown in FIG. 5, and a retainer 68.

[0031] As shown in FIG. 1, the lower jig 60 includes a plurality of guide shafts 65, a positioning recess 62, and a plurality of positioning pins 63.

[0032] Each guide shaft 65 extends upward from the upper surface of the lower jig 60. Each guide shaft 65 passes through a guided hole 56 provided in the upper jig 50. Thus, the upper jig 50 is attached to the lower jig 60 so as to be vertically displaceable via the plurality of guide shafts 65.

[0033] As shown in FIG. 2, the positioning recess 62 is a recess for positioning the gas diffusion layer 20c with respect to the lower jig 60. The positioning recess 62 has substantially the same shape and size as the gas diffusion layer 20c in a top view. As shown in FIG. 4, the receiving plate 67 is configured to be installable within the positioning recess 62.

[0034] As shown in FIG. 5, each positioning pin 63 is a pin for positioning the intermediate layer 30 with respect to the lower jig 60. Specifically, each positioning pin 63 extends upward from the upper surface of the lower jig 60. A plurality of insertion holes 33 are provided in the resin film 32 of the intermediate layer 30. Each positioning pin 63 positions the intermediate layer 30 with respect to the lower jig 60 by passing through the corresponding insertion hole 33. Note that these positioning pins 63 may be read as "positioning portions".

[0035] The retainer 68 is configured to be attachable above a portion of the upper surface of the intermediate layer 30 that does not face the gas diffusion layer 20c in the bonding state StL described later.

[0036] As shown in FIG. 1, a rod of a pressing device 80 such as an air cylinder is attached to the upper jig 50. The upper jig 50 is configured to be movable up and down in the vertical direction by this pressing device 80.

[0037] As shown in FIG. 2, the upper jig 50 includes a suction mechanism 55. The suction mechanism 55 includes a porous body 551 and a suction system 552. The porous body 551 is provided on the lower surface of the upper jig 50. When the suction mechanism 55 is turned on, the suction system 552 sucks the air inside the porous body 551. As a result, as shown in FIG. 3, the gas diffusion layer 20c is adsorbed to the lower surface of the upper jig 50.

[0038] Hereinafter, as shown in FIG. 5, a state in which the gas diffusion layer 20c is disposed on the lower surface of the upper jig and the intermediate layer 30 is disposed on the upper surface of the lower jig 60, and the adhesive A is applied to the upper surface of the intermediate layer 30 is referred to as a "bonding state StL". Specifically, in the bonding state StL of the present embodiment, the adhesive A is linearly applied along the film window 32w to both side portions sandwiching the film window 32w in the resin film 32. The fuel cell bonding jig 70 is configured to be set in the bonding state StL.

[0039] When the upper jig 50 is lowered by the pressing device 80 from the bonding state StL as shown in FIG. 6, as shown in FIGS. 7 and 8, the porous layer 26 in the gas diffusion layer 20c is pressed against the adhesive A on the intermediate layer 30.

[0040] Next, a fuel cell bonding method performed using the fuel cell bonding jig 70 described above will be described.

[0041] First, an operator prepares the fuel cell bonding jig 70 shown in FIG. 1.

[0042] Next, the operator prepares the gas diffusion layer 20c shown in FIG. 2 and places the gas diffusion layer 20c on the lower jig 60 with the porous layer 26 side facing downwards. At this time, the gas diffusion layer 20c is placed inside the positioning recess 62. Thereby, the gas diffusion layer 20c is positioned at a fixed position on the upper surface of the lower jig 60.

[0043] From this state, as shown in FIG. 3, the operator turns on the suction mechanism 55 to suction the gas diffusion layer 20c to the lower surface of the upper jig 50. Thereby, the gas diffusion layer 20c is arranged at a fixed position on the lower surface of the upper jig 50.

[0044] Next, the operator sets a predetermined receiving plate 67 in the positioning recess 62 as shown in FIG. 4.

[0045] Next, the operator prepares the intermediate layer 30 shown in FIG. 5. A moisture-curing adhesive A is applied to a predetermined location on the upper surface of the resin film 32 in the intermediate layer 30. Specifically, the adhesive A is linearly applied along the film window 32w to both side portions of the resin film 32 sandwiching the film window 32w. Note that the manufacturing environment at this time is about 50% RH (23°C).

[0046] Next, the operator places the intermediate layer 30 on the upper surface of the lower jig 60 as shown in FIG. 5. At this time, the positioning pin 63 is inserted through the insertion hole 33 of the intermediate layer 30. Thereby, the intermediate layer 30 is positioned at a fixed position on the upper surface of the lower jig 60. Note that at this time, the receiving plate 67 is positioned directly below the adhesive A.

[0047] By the above, the above-described bonding state StL is obtained. That is, the gas diffusion layer 20c is arranged on the lower surface of the upper jig 50, and the intermediate layer 30 is arranged on the upper surface of the lower jig 60, and the adhesive A is applied to the upper surface of the intermediate layer 30. Next, the operator attaches the cover 68 on the portion of the upper surface of the intermediate layer 30 that does not face the gas diffusion layer 20c in this bonding state StL.

[0048] Next, as shown in FIG. 6, the operator lowers the upper jig 50 by operating the pressing device 80. As a result, as shown in FIG. 7, the gas diffusion layer 20c adsorbed on the lower surface of the upper jig 50 abuts against the adhesive A on the upper surface of the intermediate layer 30. From this state, as the upper jig 50 further descends, as shown in FIG. 8, the gas diffusion layer 20c is pressed against the intermediate layer 30. As a result, while the adhesive A penetrates into the porous layer 26 of the gas diffusion layer 20c, the gas diffusion layer 20c is bonded to the intermediate layer 30 with the adhesive A.

[0049] Thereafter, the operator turns off the suction device 55, releases the pressing by the pressing device 80 to raise the upper jig 50, and takes out the bonded body F of the gas diffusion layer 20c and the intermediate layer 30 from the fuel cell bonding jig 70. The anode-side gas diffusion layer 20a shown in FIG. 9 is bonded to the intermediate layer 30 in the bonded body F by hot pressing.

[0050] The configuration and effects of this embodiment are summarized below.

[0051] As shown in FIG. 5, after setting to the above-described bonding state StL, as shown in FIG. 6, by lowering the upper jig 50 and pressing the gas diffusion layer 20c against the intermediate layer 30 as shown in FIGS. 7 and 8, the gas diffusion layer 20c can be bonded to the intermediate layer 30 with the adhesive A. Therefore, compared with the case where such a fuel cell bonding jig 70 is not used, it becomes easier to efficiently bond the intermediate layer 30 and the gas diffusion layer 20c.

[0052] As shown in FIG. 6, the upper jig 50 is attached to the lower jig 60 so as to be displaceable in the vertical direction via a guide shaft 65 extending in the vertical direction. Therefore, the guide shaft 65 makes it easier to correctly align the upper jig 50 with respect to the lower jig 60. Also in this respect, it becomes easier to efficiently bond the gas diffusion layer 20c to the intermediate layer 30. Further, it becomes easier to bond the gas diffusion layer 20c to the intermediate layer 30 at the correct relative position with high accuracy.

[0053] As shown in FIG. 2, the upper jig 50 is provided with a suction mechanism 55. Due to the suction by the suction mechanism 55, as shown in FIG. 3, the gas diffusion layer 20c can be configured to be disposed on the lower surface of the upper jig 50. Therefore, by this suction, the gas diffusion layer 20c can be disposed on the lower surface of the upper jig 50 against gravity. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer 20c to the intermediate layer 30.

[0054] As shown in FIG. 1, a positioning recess 62 for positioning the gas diffusion layer 20c is provided on the upper surface of the lower jig 60. Therefore, as shown in FIG. 2, after positioning the gas diffusion layer 20c in the positioning recess 62 in the lower jig 60, as shown in FIG. 3, by simply sucking the gas diffusion layer 20c onto the lower surface of the upper jig 50, the gas diffusion layer 20c can be disposed at a determined position on the lower surface of the upper jig 50. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer 20c to the intermediate layer 30 and it becomes easier to bond them at the correct relative position with high precision.

[0055] As shown in FIG. 5, positioning pins 63 for positioning the intermediate layer 30 are provided on the upper surface of the lower jig 60. By the positioning pins 63, it becomes easier to dispose the intermediate layer 30 at a determined position on the lower surface of the upper jig 50. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer 20c to the intermediate layer 30 and it becomes easier to bond them at the correct relative position with high precision.

[0056] As shown in FIG. 5, the rib 68 is configured to be attachable on the portion of the upper surface of the intermediate layer 30 that does not face the gas diffusion layer 20c in the aforementioned bonding state StL. By the rib 68, the undulation of the intermediate layer 30 can be suppressed. Also in this regard, it becomes easier to efficiently bond the gas diffusion layer 20c to the intermediate layer 30 and it becomes easier to bond them at the correct relative position with high precision.

[0057] Further, when the adhesive A shown in FIG. 8 protrudes from between the gas diffusion layer 20c and the intermediate layer 30 to the rib 68, the adhesive A adheres to the rib 68. Therefore, it is possible to prevent the adhesive A from protruding into the adhesive prohibited region, which will be described later, beyond the rib 68.

[0058] The resin film 32 shown in FIG. 7 is difficult to absorb moisture, while the porous layer 26 of the gas diffusion layer 20c is easy to absorb moisture. Therefore, as shown in FIG. 5, when the moisture-curing type adhesive A is applied to the resin film 32, the adhesive A is difficult to cure. Thereafter, as shown in FIG. 7, when the porous layer 26 of the gas diffusion layer 20c is brought into contact with the moisture-curing type adhesive A, the adhesive A becomes easy to cure due to the moisture in the porous layer 26. Therefore, it is difficult to cause a situation where the adhesive A cures before being brought into contact with the gas diffusion layer 20c, or a situation where the adhesive A does not cure easily even when brought into contact with the gas diffusion layer 20c. Thereby, it becomes easier to appropriately bond the gas diffusion layer 20c to the intermediate layer 30.

[0059] Therefore, it becomes easier to suppress the total amount of the adhesive A to be applied, and it becomes easier to suppress the application width of the adhesive A. Therefore, when bonding the gas diffusion layer 20c to the resin film 32, it is possible to prevent the adhesive A from protruding from the desired application region. Therefore, it is possible to suppress the adhesive A from protruding into the adhesive prohibited region in the fuel cell 40.

[0060] Specifically, examples of the adhesive prohibited region here include the electrode region and the vicinity of the seal region in the fuel cell 40 shown in FIG. 9. The electrode region is the regions on both sides that sandwich the electrolyte membrane 35 in its thickness direction. On the other hand, the seal region is the joint region between a plurality of cover members (not shown) that cover the intermediate layer 30 and the gas diffusion layers 20a, 20c. Therefore, the vicinity of the seal region is the vicinity of the protruding portion between the gas diffusion layers 20a, 20c in the intermediate layer 30. From these, when applying the adhesive A, the electrode region and the vicinity of the seal region are located on both sides that sandwich the application region in the horizontal direction.

[0061] From the above, according to this embodiment, by using the moisture-curing adhesive A, it is possible to suppress the adhesive A from protruding into the electrode regions on both sides thereof and the vicinity of the seal region. Therefore, it is possible to suppress the adverse effects such as the adhesive A protruding into the electrode region and affecting the internal resistance of the fuel cell 40, and the adverse effects such as the adhesive A protruding into the vicinity of the seal region and affecting the sealing performance of the fuel cell 40.

[0062] As shown in FIG. 7, after placing the gas diffusion layer 20c on the adhesive A, as shown in FIG. 8, by pressing the gas diffusion layer 20c against the intermediate layer 30, the adhesive A is infiltrated into the porous layer 26 of the gas diffusion layer 20c. By this infiltration, the curing rate of the moisture-curing adhesive A can be increased. Further, by the pressing here, the gap between the intermediate layer 30 and the gas diffusion layer 20c can be reduced, and the intermediate layer 30 and the gas diffusion layer 20c can be made closer. Thereby, problems during stacking of a plurality of fuel cells 40 can be suppressed.

[0063] [Other Embodiments] The embodiments shown above can be modified as follows, for example.

[0064] In the order reverse to that of the first embodiment, after joining the anode-side gas diffusion layer 20a shown in FIG. 9 to the intermediate layer 30 by hot pressing, the above-described fuel cell bonding method may be carried out, and the cathode-side gas diffusion layer 20c may be bonded to the intermediate layer 30 with the adhesive A.

[0065] The above-described fuel cell bonding method may be automatically performed by a robot. Instead of the positioning pin 63 shown in FIG. 5, positioning portions other than pins such as groove portions and locking portions may be provided. Instead of the adsorption mechanism 72 shown in FIG. 3, a fixture for fixing the gas diffusion layer 20c to the lower surface of the upper jig 50 may be provided.

Explanation of Reference Numerals

[0066] 20c Cathode-side gas diffusion layer 30 Intermediate layer 32 Resin film 35 Electrolyte membrane 40 Fuel cell 50 Upper jig 55 Adsorption mechanism 60 Lower jig 62 Positioning recess 63 Positioning pin (positioning part) 65 Guide shaft 68 Gavarri 80 Air cylinder (pressing device) A Adhesive StL State during bonding

Claims

1. In the manufacturing stage of a fuel cell including an intermediate layer and gas diffusion layers on both sides thereof, a bonding jig for a fuel cell for bonding the gas diffusion layer to the intermediate layer, including a lower jig configured such that the intermediate layer can be disposed on an upper surface thereof, and an upper jig configured such that the gas diffusion layer can be disposed on a lower surface thereof, configured to be set in a bonding state in which the gas diffusion layer is disposed on the lower surface of the upper jig, the intermediate layer is disposed on the upper surface of the lower jig, and an adhesive is applied to at least one of an upper surface of the intermediate layer and a lower surface of the gas diffusion layer, wherein when the upper jig is lowered from the bonding state to press the gas diffusion layer against the intermediate layer, the gas diffusion layer is bonded to the intermediate layer with the adhesive. A bonding jig for a fuel cell.

2. The upper jig is attached to be vertically displaceable with respect to the lower jig via a guide shaft extending in a vertical direction. The bonding jig for a fuel cell according to Claim 1.

3. The upper jig includes an adsorption mechanism configured to be able to adsorb the gas diffusion layer, and the upper jig is configured such that the gas diffusion layer can be disposed on the lower surface of the upper jig by adsorption by the adsorption mechanism. The bonding jig for a fuel cell according to Claim 1 or 2.

4. The lower jig is provided with a positioning recess for positioning the gas diffusion layer, and the upper jig is configured to be able to adsorb the gas diffusion layer positioned in the positioning recess. The bonding jig for a fuel cell according to Claim 3.

5. The lower jig is provided with a positioning portion for positioning the intermediate layer. The bonding jig for a fuel cell according to Claim 1 or 2.

6. The intermediate layer is larger than the gas diffusion layer, and in the bonding state, a cover is provided and configured to be attachable on a portion of the upper surface of the intermediate layer that does not face the gas diffusion layer. The bonding jig for a fuel cell according to Claim 1 or 2.

7. In the manufacturing stage of a fuel cell including an intermediate layer and gas diffusion layers on both sides thereof, a bonding method for a fuel cell for bonding the gas diffusion layer to the intermediate layer, wherein a jig including a lower jig configured such that the intermediate layer can be disposed on an upper surface thereof and an upper jig configured such that the gas diffusion layer can be disposed on a lower surface thereof is prepared. The gas diffusion layer is disposed on the lower surface of the upper jig, and the intermediate layer is disposed on the upper surface of the lower jig. The bonding state is set such that an adhesive is applied to at least one of the upper surface of the intermediate layer and the lower surface of the gas diffusion layer. From the bonding state, the upper jig is lowered to press the gas diffusion layer against the intermediate layer, thereby bonding the gas diffusion layer to the intermediate layer with the adhesive. A bonding method for a fuel cell.

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