JP7255461B2 - Manufacturing method of membrane electrode gas diffusion layer assembly - Google Patents

Description

The present disclosure relates to a method for manufacturing a membrane electrode gas diffusion layer assembly for fuel cells.

A membrane-electrode-gas-diffusion layer assembly including a membrane-electrode assembly and gas diffusion layers bonded to both surfaces of the membrane-electrode assembly is known. For example, in Patent Document 1, a transfer roller is used to bond a catalyst layer to an electrolyte membrane by heat pressure.

JP 2015-42383 A

In the production of the membrane electrode gas diffusion layer assembly, after bonding the catalyst layers, the support sheet is transported and the transfer roller is rotated. At this time, static electricity is generated between the transfer roller and the support sheet, and the support sheet may stick to the transfer roller. As a result, the production of the membrane-electrode-gas-diffusion-layer assembly needs to be interrupted in order to repair the transfer roller or the like, resulting in a decrease in productivity.

The present disclosure can be implemented as the following forms.
According to one aspect of the present disclosure, a method for manufacturing a membrane electrode gas diffusion layer assembly for a fuel cell is provided. In this method for manufacturing a membrane electrode gas diffusion layer assembly, a first sheet comprising a first gas diffusion layer, a first base material, and a support sheet, one end of the first base material and one end of the support sheet are are connected to each other, and a second sheet comprising the first sheet in which the first gas diffusion layer is laminated on the first base material, and a first catalyst layer, an electrolyte membrane, and a protective base material, By sandwiching the second sheet in which the first catalyst layer, the electrolyte membrane, and the protective base material are laminated in this order with transfer rollers rotated by the driving force of a motor, the first sheet and a first bonding step of forming a laminate with the second sheet; and after peeling the protective base material from the laminate, a second catalyst layer and a second gas diffusion layer are formed on the electrolyte membrane of the laminate. and a second bonding step of bonding. In the first joining step, the transfer roller is used to transfer the first catalyst layer of the second sheet to the first gas diffusion layer while the first gas diffusion layer portion of the first sheet is sandwiched between the transfer rollers. During the period in which the support sheet portion of the first sheet is sandwiched between the transfer rollers and the support sheet is sandwiched between the transfer roller and the support sheet. Then, a sheet-like second base material having a small amount of charge is inserted.

(1) According to one aspect of the present disclosure, a method for manufacturing a membrane electrode gas diffusion layer assembly is provided. This manufacturing method includes steps of bonding a catalyst layer to a gas diffusion layer using a transfer roller; a step of conveying the support sheet through a sheet-like base material having a smaller amount of charge than the transfer roller; and a step of rotating the transfer roller.
According to the manufacturing method of this aspect, the support sheet is conveyed between the transfer roller and the support sheet through the sheet-shaped base material having a smaller charge amount than the support sheet, and the transfer roller is rotated. and the support sheet. Therefore, it is possible to prevent the support sheet from sticking to the transfer roller, thereby suppressing a decrease in productivity in manufacturing the membrane electrode gas diffusion layer assembly.

The present disclosure can also be implemented in various embodiments. For example, it can be realized in the form of a method for manufacturing a fuel cell comprising a membrane electrode gas diffusion layer assembly, a membrane electrode gas diffusion layer assembly, a fuel cell comprising a membrane electrode gas diffusion layer assembly, and the like.

FIG. 2 is a cross-sectional view schematically showing a fuel cell including a membrane electrode gas diffusion layer assembly; FIG. 2 is an explanatory diagram schematically showing the configuration of the main part of the gas diffusion layer forming apparatus; Explanatory drawing which shows typically the structure of a 1st roll material. Explanatory drawing which shows typically the structure of the principal part of a joining apparatus. 4A to 4C are process diagrams showing a method for manufacturing a membrane electrode gas diffusion layer assembly. FIG. 4 is an explanatory diagram schematically showing how process P30 and process P35 are executed; The figure which shows the measurement result of the tension|tensile_strength of a 2nd base material.

A. Embodiment:
A1. Fuel cell configuration:
FIG. 1 is a cross-sectional view schematically showing a fuel cell 50 including a membrane electrode-gas diffusion layer assembly 20 manufactured by a method for manufacturing a membrane electrode-gas diffusion layer assembly as one embodiment of the present disclosure. The fuel cell 50 is a polymer electrolyte fuel cell that generates electricity by supplying hydrogen gas as a fuel gas and air as an oxidant gas as reaction gases. Although only one fuel cell 50 is shown in FIG. 1, it is common to stack a plurality of fuel cells 50 for use.

The fuel cell 50 includes a membrane electrode gas diffusion layer assembly (MEGA) 20 and a pair of separators 32 and 34 sandwiching the MEGA 10 .

MEGA 20 includes membrane electrode assembly 10 , anode-side gas diffusion layer 22 , and cathode-side gas diffusion layer 24 . The membrane electrode assembly 10 includes an electrolyte membrane 15 , an anode catalyst layer 12 and a cathode catalyst layer 14 .

The electrolyte membrane 15 is a proton-conducting ion-exchange membrane made of a solid polymer compound, such as a fluororesin, and exhibits good electrical conductivity in a wet state. The electrolyte membrane 15 is formed using, for example, Nafion (a registered trademark of DuPont).

The anode-side catalyst layer 12 and the cathode-side catalyst layer 14 are composed of an ionomer (eg, Nafion), which is a polymer electrolyte, and conductive base particles (eg, carbon particles) carrying a catalyst (eg, platinum). include.

The anode-side gas diffusion layer 22 and the cathode-side gas diffusion layer 24 are arranged to face each other with the membrane electrode assembly 10 interposed therebetween. The anode-side gas diffusion layer 22 is joined to the anode-side catalyst layer 12 of the membrane electrode assembly 10 . The cathode-side gas diffusion layer 24 is bonded to the cathode-side catalyst layer 14 of the membrane electrode assembly 10 . These two gas diffusion layers 22 and 24 are both made of a conductive material with excellent gas diffusion. For example, it may be made of carbon cloth or carbon paper made of non-woven fabric.

The anode side separator 32 and the cathode side separator 34 are arranged to face each other with the membrane electrode assembly 10 and the two gas diffusion layers 22 and 24 interposed therebetween. These two separators 32 and 34 are both made of a conductive member with high gas barrier properties (gas impermeability). The cross section of the anode-side separator 32 has an uneven shape, and when the anode-side separator 32 is in contact with the membrane electrode assembly 10 , the fuel gas flow path 42 is formed between the anode-side separator 32 and the anode-side gas diffusion layer 22 . is formed. Similarly, the cross section of the cathode-side separator 34 has an uneven shape, and the cathode-side separator 34 is in contact with the membrane electrode assembly 10 , so that the oxidant is allowed to flow between the cathode-side separator 34 and the cathode-side gas diffusion layer 24 . A gas flow path 44 is formed.

A2. Configuration of manufacturing apparatus for membrane electrode gas diffusion layer assembly:
FIG. 2 is an explanatory diagram schematically showing the configuration of the main part of the gas diffusion layer forming apparatus 110 used for manufacturing the MEGA 20. As shown in FIG. The gas diffusion layer forming apparatus 110 includes a first unwinding roller 111, a second unwinding roller 115, a first winding roller 117, a die head 112, a backup roll 113, a baking furnace 114, and a conveying roller 116. Prepare. The gas diffusion layer forming apparatus 110 forms the anode-side gas diffusion layer 22 on the first base material 71 while conveying the sheet-like first base material 71 unwound by the first unwinding roller 111 . It is a so-called roll-to-roll type apparatus in which the film is wound into a roll by a winding roller 117 . In the gas diffusion layer forming apparatus 110 , the sheet-like support sheet 73 unwound in advance by the first unwinding roller 111 is filled on the conveying path of the base material. Although FIG. 2 illustrates the manufacturing process of the anode-side gas diffusion layer 22 , the cathode-side gas diffusion layer 24 is manufactured by the same procedure as the anode-side gas diffusion layer 22 . The cross-sectional views in the drawings schematically show cross-sections of the product for each step.

The first unwinding roller 111, the second unwinding roller 115, the conveying roller 116, the first winding roller 117, and the backup roll 113 are driven by motors (not shown) to rotate in the direction of the thin arrows. By rotating, the first unwinding roller 111 unwinds the first base material 71 from the first roll material 70 and conveys it along the conveying direction indicated by the white arrow.

FIG. 3 is an explanatory diagram schematically showing the configuration of the first roll material 70. As shown in FIG. The first roll material 70 is composed of a first base material 71 and a support sheet 73 . Specifically, the first base material 71 and the support sheet 73 are joined together with the adhesive tape Tp, and the first base material 71 and the support sheet 73 are wound into a roll to form the first roll material 70. . More specifically, the first roll material 70 is produced by the following procedure. First, the adhesive tape Tp is arranged between the first base material 71 and the support sheet 73 so that one end of the first base material 71 and one end of the support sheet 73 overlap each other. Next, the first base material 71 and the support sheet 73 are joined by pressing the first base material 71 against the support sheet 73 using a roller (not shown). Then, the first base material 71 and the support sheet 73 are wound in this order. That is, the first roll material 70 has the first base material 71 wound on the inner side, and the support sheet is formed on the outer side of the layer of the first base material 71 formed by winding the first base material 71 . 73 is wound. In the following description, the base material layer wound inside the roll material may be called an inner layer, and the base material layer wound outside the inner layer may be called an outer layer.

As shown in FIG. 2, the second unwinding roller 115 rotates to unwind the second base material 81 from the second roll material 80 and conveys it along the conveying direction indicated by the white arrow. The conveying roller 116 rotates to rotate the first base material 71 having the anode-side gas diffusion layer 22 formed thereon (hereinafter referred to as "gas diffusion layer sheet 91") and the second base material, which are supplied from the upstream side. The material 81 is conveyed along the conveying direction indicated by the white arrow. The first winding roller 117 winds the transported gas diffusion layer sheet 91 and second base material 81 around the third roll material 75 . As shown within the dashed line, the inner layer of the third roll material 75 is composed of the support sheet 73 and the second base material 81, and the outer layer of the third roll material 75 is composed of the gas diffusion layer sheet 91 and the second base material 81. It is configured.

In this embodiment, the support sheet 73 is a polyimide film. The first base material 71 is carbon paper. The first base material 71 may be a porous sheet-like base material such as carbon cloth instead of carbon paper. The second base material 81 is kraft paper. The second base material 81 may be a sheet-like base material having a smaller charge amount than the support sheet 73, such as recycled paper, aluminum foil, acrylic film, etc., instead of kraft paper.

The die head 112 is configured as part of a coating machine (not shown), and is arranged to face one surface of the first base material 71 . The die head 112 is arranged to face the backup roll 113 with the first base material 71 interposed therebetween. Therefore, the first base material 71 is supported by the backup roll 113 by contacting the backup roll 113 with the other surface of the first base material 71 at the portion facing the die head 112 . The die head 112 ejects the MPL coating liquid contained in the coating machine onto one surface of the first base material 71 . The MPL coating liquid contains, for example, a conductive material such as carbon black, a surfactant for imparting hydrophilicity, a water-repellent resin such as polytetrafluoroethylene, and the like.

The baking furnace 114 is configured by a general heating furnace, and heats the first base material 71 coated with the MPL coating liquid. By heating the first base material 71 , the moisture contained in the MPL coating liquid and the surfactant are removed by thermal decomposition, and the anode-side gas diffusion layer 22 is formed on the first base material 71 . be done.

FIG. 4 is an explanatory diagram schematically showing the configuration of the main part of the joining device 130 used for manufacturing the MEGA 20. As shown in FIG. The joining device 130 includes a third unwinding roller 131, a fourth unwinding roller 133, a fifth unwinding roller 136, a second winding roller 132, a third winding roller 135, and a fourth winding roller. 138 , a fifth take-up roller 139 and a pair of transfer rollers 134 and 137 . The joining apparatus 130 is a roll-to-roll type apparatus, and includes a gas diffusion layer sheet 91 unwound by a third unwinding roller 131, and an anode catalyst layer 12 and an electrolyte layer unwound by a fourth unwinding roller 133. The membrane 15 and the cathode-side catalyst layer 14 unwound by the fifth unwinding roller 136 are transported and joined to form the MEGA 20 , and wound into a roll by the fifth winding roller 139 .

The unwinding rollers 131, 133 and 136, the winding rollers 132, 135, 138 and 139, and the transfer rollers 134 and 137 are driven by motors (not shown), respectively, and rotate in the directions indicated by thin arrows.

By rotating, the third unwinding roller 131 unwinds the gas diffusion layer sheet 91 and the second base material 81 from the third roll material 75 and conveys them along the conveying direction indicated by the white arrow. The second take-up roller 132 rotates to wind the second base material 81 onto the fourth roll material 82 out of the gas diffusion layer sheet 91 and the second base material 81 conveyed from upstream. By rotating, the fourth unwinding roller 133 unwinds the electrolyte membrane sheet 92 and the protective base material 67 from the fifth roll material 60 and conveys them along the conveying direction indicated by the white arrow.

The electrolyte membrane sheet 92 is a sheet-like base material in which the anode side catalyst layer 12 is bonded to the electrolyte membrane 15 . The protective base material 67 is a back sheet that protects the surface of the electrolyte membrane 15 . The protective base material 67 is formed of, for example, a polyester-based material such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate), or a polymer sheet such as polystyrene.

A pair of transfer rollers 134 bonds the anode-side gas diffusion layer 22 of the gas diffusion layer sheet 91 to the anode-side catalyst layer 12 of the electrolyte membrane sheet 92 . Specifically, the transfer roller 134 sandwiches the gas diffusion layer sheet 91 and the protective base material 67 from both sides along the stacking direction, pressurizes the stacking direction, and heats the electrolyte membrane sheet 92 and the gas diffusion layer. The sheet 91 is joined to form a first joined body sheet 93 . Although not shown in FIG. 4, a heating coil is provided inside the transfer roller 134. As the transfer roller 134 rotates, the entire transfer roller 134 is heated to a substantially uniform temperature. be. The formed first joined body sheet 93 is conveyed along with the protective base material 67 along the conveying direction indicated by the white arrow.

The third take-up roller 135 rotates to wind the protective base material 67 onto the seventh roll material 61 out of the first bonded body sheet 93 and the protective base material 67 conveyed from upstream. By rotating, the fifth unwinding roller 136 unwinds the cathode-side catalyst layer 14 and the transfer base material 68 from the eighth roll material 62 and conveys them along the conveying direction indicated by the white arrow.

A pair of transfer rollers 137 bonds the cathode-side catalyst layer 14 to the electrolyte membrane 15 of the first bonded body sheet 93 . Specifically, the transfer roller 137 sandwiches the first bonded sheet 93 and the transfer base material 68 from both sides along the stacking direction, pressurizes and heats the first bonded sheet 93 and the transfer base material 68 in the stacking direction. A second bonded sheet 94 is formed by bonding with the cathode side catalyst layer 14 . The transfer roller 137 conveys the formed second joined body sheet 94 together with the transfer base material 68 along the conveying direction indicated by the white arrow. The transfer roller 137 is provided with a heating coil inside, similarly to the transfer roller 134 described above, and is heated by the rotation of the transfer roller 137 .

The fourth winding roller 138 rotates to wind the transfer base material 68 onto the ninth roll material 63 among the second bonded body sheet 94 and the transfer base material 68 conveyed from upstream. The fifth winding roller 139 winds the second joined body sheet 94 conveyed from upstream onto the tenth roll material 77 by rotating. As shown within the dashed line, the inner layer of the tenth roll material 77 is composed of the support sheet 73 and the outer layer of the tenth roll material 77 is composed of the second bonded body sheet 94 .

A3. Manufacturing method of membrane electrode gas diffusion layer assembly:
FIG. 5 is a process diagram showing a method of manufacturing the membrane electrode gas diffusion layer assembly 20. As shown in FIG. The membrane electrode gas diffusion layer assembly 20 is manufactured using the gas diffusion layer forming apparatus 110 shown in FIG. 2, the catalyst layer forming apparatus (not shown), and the joining apparatus 130 shown in FIG. First, various materials for manufacturing the membrane electrode gas diffusion layer assembly 20 are prepared (process P10). In step P<b>10 , first, the first roll material 70 described above is prepared and set on the first unwinding roller 111 of the gas diffusion layer forming apparatus 110 . Next, the support sheet 73 is unwound from the first unwinding roller 111 and conveyed downstream in the conveying direction, and the support sheet 73 fills the base material conveying path in the gas diffusion layer forming apparatus 110 . At this time, the support sheet 73 is conveyed downstream in the conveying direction until the first base material 71 is arranged at the leading end of the unwinding side of the first roll material 70 .

A gas diffusion layer 22 is produced (process P15). Specifically, first, the MPL coating liquid is applied by the die head 112 to the first base material 71 unwound from the first roll material 70 . Then, the first base material 71 is conveyed downstream in the conveying direction, and the MPL coating liquid is dried in the baking furnace 114 , thereby forming the gas diffusion layer 22 on the first base material 71 . The formed gas diffusion layer 22 (more specifically, the gas diffusion layer sheet 91 described above) is wound around the third roll material 75 together with the second base material 81 . Although illustration is omitted, the third roll material 75 is set on the third unwinding roller 131 of the joining device 130 after execution of step P15.

Catalyst layers 12 and 14 are produced (step P20). Specifically, in a catalyst device (not shown), the catalyst ink is applied to one surface of the electrolyte membrane 15 and then dried to form the anode catalyst layer 12 on one surface of the electrolyte membrane 15 . The formed anode-side catalyst layer 12 (more specifically, the electrolyte membrane sheet 92 described above) is wound into a roll together with the protective base material 67 to produce the fifth roll material 60 . Further, the cathode side catalyst layer 14 is formed on one surface of the transfer base material 68 by drying after applying the catalyst ink to one surface of the transfer base material 68 . The cathode-side catalyst layer 14 formed on the transfer base material 68 is wound into a roll to produce the eighth roll material 62 . The manufactured fifth roll material 60 is set on the fourth unwinding roller 133 of the joining device 130, and the manufactured eighth roll material 62 is set on the fifth unwinding roller 136 of the joining device 130. .

The catalyst layers 12 and 14 and the gas diffusion layer 22 are bonded (process P25). Specifically, first, the gas diffusion layer 22 (more specifically, the gas diffusion layer sheet 91 described above) and the second base material 81 are unwound from the third roll material 75 , and then rolled up by the second winding roller 132 . After the second base material 81 is peeled off, the gas diffusion layer 22 is transported downstream in the transport direction. Next, the anode-side catalyst layer 12 and the electrolyte membrane 15 unwound from the fifth roll material 60 are laminated on the surface of the gas diffusion layer 22 , and the gas diffusion layer 22 and the anode-side catalyst layer 12 are laminated by the transfer roller 134 . is joined. Next, the cathode catalyst layer 14 unwound from the eighth roll material 62 is laminated on the surface of the electrolyte membrane 15 transported from upstream, and the electrolyte membrane 15 and the cathode catalyst layer 14 are separated by the transfer roller 137 . are spliced. By bonding the gas diffusion layer 22, the anode catalyst layer 12, the electrolyte membrane 15, and the cathode catalyst layer 14 in this manner, the second bonded sheet 94 is formed. It is wound on the tenth roll material 77 .

The above-described step P25 is repeatedly performed until the inner layer of the third roll material 75 (the layer of the support sheet 73) is reached. In other words, it is executed until the support sheet 73 is unwound from the third roll material 75 . Thereafter, when the support sheet 73 is unwound from the third unwind roller 131, the end of the unwound support sheet 73 and the end of the first base material 71 are cut.

The second base material 81 and the support sheet 73 are conveyed (process P30). Next, the transfer rollers 134 and 137 are rotated (process P35).

FIG. 6 is an explanatory diagram schematically showing how steps P30 and P35 are executed. A joining device 130a shown in FIG. 6 differs from the joining device 130 shown in FIG. 4 in that a sixth unwinding roller 141 is attached. The sixth unwinding roller 141 stops the operation of the joining device 130 and is set in the joining device 130a after the step P25 described above. An eleventh roll material 87 around which the second base material 81 is wound is set on the sixth unwinding roller 141 .

In step P30, first, the inner layer support sheet 73 of the tenth roll material 77 is unwound from the third unwinding roller 131 and conveyed along the conveying direction indicated by the white arrow. Next, the second base material 81 is unwound from the sixth unwinding roller 141 and conveyed below the support sheet 73 . That is, the second base material 81 is inserted between the lower surface of the support sheet 73 and the transfer roller 134 and is transported along the transport direction together with the support sheet 73 . Next, the protective base material 67 is unwound from the fourth unwinding roller 133 and conveyed above the support sheet 73 . That is, the protective base material 67 is inserted between the upper surface of the support sheet 73 and the transfer roller 134 and conveyed along the conveying direction together with the support sheet 73 . Therefore, in this embodiment, the transfer roller 134 and the support sheet 73 do not come into contact with each other.

In step P35, first, the transfer roller 134 is rotated. At this time, the transfer roller 134 is heated by the heating coil included in the transfer roller 134 . In addition, the transfer roller 134 sandwiches and presses the protective base material 67, the support sheet 73, and the second base material 81 from both sides along the stacking direction.

Next, after the protection base material 67 is wound up by the third winding roller 135 , the transfer base material 68 is unwound from the fifth unwinding roller 136 and conveyed above the support sheet 73 . Therefore, the transfer base material 68 is inserted between the upper surface of the support sheet 73 and the transfer roller 137 and conveyed along the conveyance direction together with the support sheet 73 . Therefore, the transfer roller 137 and the support sheet 73 do not come into contact with each other. Next, the transfer roller 137 is rotated. Specifically, similarly to the transfer roller 134 described above, the transfer roller 137 is rotated to heat the transfer roller 137 and pressurize the protective base material 67, the support sheet 73, and the second base material 81. . Next, the transfer base material 68 is wound up by the fourth winding roller 138, and the support sheet 73 and the second base material 81 are transported downstream in the transport direction. Then, the support sheet 73 and the second base material 81 are filled on the base material transport path in the bonding device 130a.

Although not shown, the cathode-side gas diffusion layer 24 is then joined to the cathode-side catalyst layer 14 of the second assembly sheet 94 to complete the membrane electrode gas diffusion layer assembly 20 . A fuel cell 50 is fabricated by sandwiching the membrane electrode gas diffusion layer assembly 20 between a pair of separators 32 and 34 .

FIG. 7 is a diagram showing the measurement results of the tension of the second base material 81. As shown in FIG. FIG. 7 shows the result of measuring the tension of the second base material 81 unwound from the sixth unwinding roller 141 using the following five samples as the second base material 81 conveyed in the above-described step P30. showing.
<Sample 1>
Polyimide film <Sample 2>
Kraft paper <Sample 3>
Recycled paper <Sample 4>
Aluminum foil <Sample 5>
Acrylic Film The size of each sample was in the range of 100 nm to 500 nm in width and 100 m to 500 m in length.

The tension of the second base material 81 unwound from the sixth unwind roller 141 was measured by the following procedure. First, in the joining device 130a shown in FIG. 6, the supporting sheet 73 was unwound from the third unwinding roller 131 to fill the conveying path with the supporting sheet 73. As shown in FIG. At this time, the tension of the support sheet 73 wound around the tenth roll material 77 is set to 45 (N) to 80 (N), and the tension when unwinding the support sheet 73 from the third unwinding roller 131 is set to 45 (N). N) to 100 (N), and the conveying speed of the support sheet 73 was about 1 meter to 10 meters per minute. Next, the second base material 81 is unwound from the sixth unwinding roller 141 and sandwiched between one surface of the support sheet 73 and the transfer roller 134 . The protective base material 67 is unwound and sandwiched between the other surface of the support sheet 73 and the transfer roller 134, and the support sheet 73, the second base material 81 and the protective base material 67 are moved downstream in the conveying direction. transported to Next, the transfer roller 134 was rotated for 60 minutes to raise the temperature of the transfer roller 134 to a temperature in the range of 100°C to 150°C. At this time, the pressure between the pair of transfer rollers 134 was in the range of about 2 kg (N) to 6 kg (N). Then, the tension of the second base material 81 unwound from the sixth unwinding roller 141 was measured.

As shown in FIG. 7, in the case of sample 1, the tension increase rate was 100%. This is because the same polyimide film as the support sheet 73 is used as the second base material 81, so that the second base material 81 sticks to the surface of the transfer roller 134 when the transfer roller 134 rotates. It is presumed that the tension of the second base material 81 from the sixth unwinding roller 141 to the transfer roller 134 increased because the base material 81 was not conveyed downstream in the conveying direction.

On the other hand, in the case of samples 2, 3 and 4, the rate of occurrence of tension increase was 0%, and in the case of sample 5, the rate of occurrence of tension increase was 33%. Therefore, when samples 2, 3, 4 and 5 were used, the ratio of occurrence of tension increase was able to be reduced as compared with the case of sample 1. This is because the second base material 81 is made of a base material having a smaller amount of charge than the support sheet 73, so that static electricity is generated between the transfer roller 134 and the second base material 81 when the transfer roller 134 rotates. It is presumed that this is because the occurrence of As a result, it is considered that the adhesion of the second base material 81 to the surface of the transfer roller 134 could be suppressed. In samples 2, 3, and 4, the increase in the tension of the second base material 81 was suppressed to 0%. 81 is more preferred.

According to the method for manufacturing the membrane electrode gas diffusion layer assembly 20 of this embodiment having the above configuration, after the catalyst layers 12 and 14 are bonded to the gas diffusion layer 22, the transfer rollers 134 and 137 and the support sheet 73 Between the transfer rollers 134 and 137 and the support sheet 73, the transfer rollers 134 and 137 are rotated while the support sheet 73 is conveyed through the second base material 81 having a smaller charge amount than the support sheet 73. can suppress the generation of static electricity. Therefore, sticking of the support sheet 73 to the transfer rollers 134 and 137 can be suppressed. Therefore, in manufacturing the membrane electrode gas diffusion layer assembly 20, it is possible to suppress a decrease in productivity.

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention column may be used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10... Membrane electrode assembly 12... Anode side catalyst layer 14... Cathode side catalyst layer 15... Electrolyte membrane 20... Membrane electrode gas diffusion layer assembly 22... Anode side gas diffusion layer 24... Cathode side gas diffusion Layer 32... Anode side separator 34... Cathode side separator 42... Fuel gas channel 44... Oxidant gas channel 50... Fuel cell 60... Fifth roll material 61... Seventh roll material 62... Eighth roll material, 63... Ninth roll material, 67... Protective base material, 68... Transfer base material, 70... First roll material, 71... First base material, 73... Support sheet, 75... Third roll material, 77... Tenth roll material, 80... Second roll material, 81... Second base material, 82... Fourth roll material, 87... Eleventh roll material, 91... Gas diffusion layer sheet, 92... Electrolyte membrane sheet, 93... First bonded sheet 94 Second bonded sheet 110 Gas diffusion layer forming device 111 First unwinding roller 112 Die head 113 Backup roll 114 Firing furnace 115 Second unwinding Rollers 116 Conveying roller 117 First winding roller 130, 130a Joining device 131 Third winding roller 132 Second winding roller 133 Fourth winding roller 134 Transfer roller , 135... 3rd winding roller 136... 5th unwinding roller 137... transfer roller 138... 4th winding roller 139... 5th winding roller 141... 6th unwinding roller Tp... adhesive tape

Claims (1)

A method for manufacturing a membrane electrode gas diffusion layer assembly, comprising:
A first sheet comprising a first gas diffusion layer, a first base material, and a support sheet, wherein one end of the first base material and one end of the support sheet are connected, and the first base material and the A second sheet comprising a first sheet on which a first gas diffusion layer is laminated, and a first catalyst layer, an electrolyte membrane, and a protective base material, wherein the first catalyst layer, the electrolyte membrane, and the protective group are provided. and the second sheet laminated in this order are sandwiched between transfer rollers rotated by a driving force of a motor to form a laminate of the first sheet and the second sheet. a bonding process;
a second bonding step of bonding a second catalyst layer and a second gas diffusion layer to the electrolyte membrane of the laminate after peeling the protective base material from the laminate;
with
In the first bonding step,
While the first gas diffusion layer portion of the first sheet is sandwiched between the transfer rollers, the transfer roller is used to transfer the first gas diffusion layer of the second sheet to the first gas diffusion layer of the first sheet. bonded to the diffusion layer ,
During a period in which the support sheet portion of the first sheet is sandwiched between the transfer rollers, a sheet-like second base material having a smaller charge amount than the support sheet is placed between the transfer roller and the support sheet. A method for manufacturing a membrane electrode gas diffusion layer assembly to be inserted .

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