Apparatus and method for continuously manufacturing fuel cell membrane electrode multifunctional ccm

Abstract

The application discloses a device for continuously manufacturing a fuel cell membrane electrode multifunctional CCM, comprising: a feeding unit for providing a proton exchange membrane; a guide roller group for traction of the proton exchange membrane, the guide roller group divides the proton exchange membrane into a first running section and a second running section; a turnover unit for adjusting the first running section into the second running section; a cathode slot coating unit arranged on one of the first running section and the second running section, for coating a cathode catalytic layer on one side of the proton exchange membrane; an anode ultrasonic spraying unit arranged on the other one, for spraying an anode functional catalytic layer on the other side of the proton exchange membrane; an anode slot coating unit for coating an anode catalytic layer on the anode functional catalytic layer; and a collecting unit for winding the proton exchange membrane with both sides completed coating; and a method for continuously manufacturing the fuel cell membrane electrode multifunctional CCM. The application can realize the continuous manufacturing of the CCM compatible with the ultra-thin functional catalytic layer.

Description

Technical Field

[0001] This invention relates to the field of membrane electrode manufacturing technology, and specifically to an apparatus and method for continuously manufacturing multifunctional CCM membrane electrodes for fuel cells. Background Technology

[0002] Proton exchange membrane fuel cells (PEMFCs) have become an important carrier of the hydrogen economy due to their low operating temperature, high energy conversion efficiency, small size, and zero pollution. Furthermore, because of these advantages, PEMFCs are considered promising candidates for use as a power source and backup power source for automobiles.

[0003] The membrane electrode assembly (MEA) is a key component of a proton exchange membrane fuel cell (PEMFC), serving as the core reaction site. It consists of a diffusion layer, a catalyst layer, and a proton exchange membrane. The three-in-one structure comprised of the catalyst layer and the proton exchange membrane is called the CCM. In the fuel cell, the electrochemical reaction of hydrogen and oxygen occurs within the catalyst layer. Specifically, the oxygen reduction reaction occurs in the cathode catalyst layer, and the hydrogen oxidation reaction occurs in the anode catalyst layer. The anode catalyst layer decomposes hydrogen into protons, releasing electrons, which travel through an external circuit to the cathode. The cathode catalyst layer catalyzes the electrochemical reaction between protons and oxygen, generating electrons to produce water. In practical applications, the performance of the fuel cell MEA largely depends on the design of the catalyst layer.

[0004] During fuel cell operation, if blockage occurs, obstructing hydrogen transport at the anode and preventing proton production in the blocked area, other reactions will occur in the anode region to maintain charge balance and meet the proton production requirements. There are typically two pathways to provide protons: carbon corrosion (C + 2H₂O = 4H₂O) + +CO2+4e - Alternatively, water may undergo electrolysis: 2H₂O = 4H₂O + +O2+4e -Carbon corrosion directly causes the loss of the catalyst layer, leading to membrane electrode failure. Water electrolysis often requires a high potential. In the past, researchers have introduced water electrolysis catalysts to achieve water electrolysis at low potentials, thereby reducing or even avoiding carbon corrosion. Many studies have shown that adding iridium oxide or ruthenium oxide functional materials can extend the lifespan of the catalyst layer. In practical designs, from a cost and performance perspective, very little material is usually added. Therefore, the anode can typically be designed to contain a very thin functional catalyst sublayer and a general-purpose hydroxide anode catalyst sublayer. For example, patent specification CN113851658A discloses a high-reverse-polarity anode catalyst layer and its preparation and application in membrane electrodes and fuel cells. This anode catalyst layer includes an inner anode catalyst layer near the proton exchange membrane and an outer anode catalyst layer near the gas diffusion layer. At least the inner anode catalyst layer contains a reverse-polarity catalyst and a hydrophilic additive; and the content of the hydrophilic additive in the inner anode catalyst layer is not less than that in the outer anode catalyst layer, or the water retention capacity of the inner anode catalyst layer is not less than that of the outer anode catalyst layer. By designing the anode catalyst layer structure, a water-retaining chemical environment is created on the side near the proton exchange membrane to promote water electrolysis during the reverse polarity of the membrane electrode and fuel cell, thereby protecting the carbon support in the catalyst layer from corrosion and improving the lifespan of the membrane electrode and fuel cell.

[0005] Currently, slit coating is the most widely used method for preparing CCMs among membrane electrode fabrication methods. However, the low distance between the slit coating method and the base film during the preparation of ultrathin coated films can easily damage the proton exchange membrane. Therefore, it is difficult to achieve continuous fabrication of CCMs with compatible ultrathin functional catalyst layers using only the slit coating method. Summary of the Invention

[0006] One object of the present invention is to provide an apparatus for the continuous manufacturing of a multifunctional CCM for fuel cell membrane electrodes, which enables the continuous manufacturing of CCMs compatible with ultrathin functional catalyst layers.

[0007] An apparatus for continuously manufacturing a multifunctional membrane electrode assembly (CCM) for a fuel cell, the CCM comprising a proton exchange membrane, a cathode catalytic layer disposed on one side of the proton exchange membrane, an anode functional catalytic layer disposed on the other side of the proton exchange membrane, and an anode catalytic layer disposed on the anode functional catalytic layer; the apparatus comprising: The feeding unit is used to supply proton exchange membranes; A guide roller assembly is used for traction and positioning of the proton exchange membrane. The guide roller assembly includes several guide rollers arranged along the travel direction of the proton exchange membrane, and the guide roller assembly divides the proton exchange membrane into a first travel section and a second travel section. A flipping unit is used to adjust the first traveling segment into the second traveling segment; A cathode slit coating unit is disposed on one of the first and second traveling sections and is used to coat a cathode catalyst layer at intervals on one side of the proton exchange membrane. An anode ultrasonic spraying unit is disposed on another section of the first and second traveling sections, and is used to spray an anode functional catalytic layer at intervals on the other side of the proton exchange membrane, wherein the anode functional catalytic layer corresponds to the position of the cathode catalytic layer; An anode slit coating unit is disposed on the traveling section where the anode ultrasonic spraying unit is located, and is used to coat the anode catalytic layer on the anode functional catalytic layer; The take-up unit is used to wind up the proton exchange membrane that has been coated on both sides.

[0008] This solution achieves the preparation of ultrathin anode functional catalytic layers by using ultrasonic spraying on one side of the anode. At the same time, the combination of the two coating methods enables compatible manufacturing with one-time double-sided continuous coating.

[0009] The cathode and anode slit coating units include slit extrusion heads, slurry delivery systems, and coating control units; the coating control unit controls the slurry coating cut-off and movement according to the required spray size and position.

[0010] The anodic ultrasonic spraying unit includes a nozzle array, a travel control unit, a liquid supply unit, and a mask. The nozzle array is matched with the array specifications according to the required spraying pattern width. The spraying control unit controls the opening and closing of the spraying solenoid valve according to the roll travel distance matched with the spraying pattern. The nozzle array includes one or more nozzles, which are respectively connected to the travel control unit and the liquid supply unit. The mask is set between the nozzle array and the drying unit.

[0011] Preferably, both the first and second traveling sections are equipped with drying units for drying the corresponding catalyst layers after coating.

[0012] The drying unit can heat from room temperature to 200°C and also includes an exhaust system to remove the evaporated solvent.

[0013] Preferably, the following are respectively provided at the ends of the first traveling segment and the second traveling segment: A protective film supply unit is used to provide the protective film. The pressure roller rests against the proton exchange membrane to attach the protective membrane to the catalyst layer.

[0014] Preferably, one side of the proton exchange membrane is provided with a base membrane, and at the end of the first traveling segment, there is: A stripping roller, pressed against the proton exchange membrane, is used to peel off the base membrane; The base film winding unit is used to wind up the peeled base film.

[0015] Preferably, the flipping unit includes a pair of flipping rollers spaced apart and abutting against the proton exchange membrane. The line connecting the two flipping rollers is perpendicular to the first traveling section and the second traveling section. The first traveling section and the second traveling section are horizontally arranged and their directions are 180 degrees apart.

[0016] Preferably, the cathode catalyst layer is composed of an oxygen reduction catalyst and an ionomer, and the thickness of the cathode catalyst layer is 8~15μm; the anode functional catalyst layer is composed of an oxygen evolution catalyst and an ionomer, and the thickness of the anode functional catalyst layer is less than 3μm; the anode catalyst layer is composed of a hydroxide catalyst and an ionomer, and the thickness of the anode catalyst layer is 3~5μm.

[0017] Another object of the present invention is to provide a method for continuously manufacturing a multifunctional CCM for a fuel cell membrane electrode assembly, using the above-described apparatus, the method comprising the following steps: (1) The feeding unit provides the proton exchange membrane, which enters the cathode slit coating unit under the traction of the guide roller group; (2) The cathode slit coating unit begins coating, and then the proton exchange membrane that has completed one side coating is dried by the drying unit, so that one side of the proton exchange membrane forms a cathode catalyst layer. (3) The proton exchange membrane with the cathode catalyst layer is flipped 180° by the flipping unit so that the uncoated side of the proton exchange membrane faces upward and enters the anode ultrasonic spraying unit under the traction of the guide roller group; (4) The anode ultrasonic spraying unit starts spraying on the other side of the proton exchange membrane. Then the proton exchange membrane that has completed the spraying on the other side is dried by the drying unit, so that the other side of the proton exchange membrane forms an anode functional catalytic layer. (5) The proton exchange membrane with the anodic functional catalyst layer enters the anodic slit coating unit for coating, and then passes through the drying unit for drying, so that the anodic catalyst layer is formed on the anodic functional catalyst layer; (6) The proton exchange membrane with double-sided coating is pulled to the take-up unit by the guide roller group to complete the winding.

[0018] Preferably, after steps (2) and (5) are completed, the following steps are performed respectively: Step (21): The cathode protective film feeding unit provides the cathode protective film, which is then applied to the cathode catalyst layer under the action of the first pressure roller; Step (51): The anode protective film feeding unit provides the anode protective film, which is then applied to the anode catalyst layer by the action of the second pressure roller.

[0019] Preferably, step (22) is performed immediately after step (2): the base film on the surface of the proton exchange membrane is peeled off under the action of the peeling roller, and the peeled base film is wound up by the base film winding unit.

[0020] Another object of the present invention is to provide a multifunctional CCM for a fuel cell membrane electrode assembly, which is prepared by the above method.

[0021] The beneficial effects of this invention are: (1) The present invention achieves the preparation of ultrathin anode functional catalytic layers by using ultrasonic spraying on the anode side, which can ensure continuous production of coating and realize the multifunctionality of membrane electrode.

[0022] (2) By combining slit coating and ultrasonic spraying, this invention ensures the rapid preparation of ultrathin functional layers, as well as the efficient production of cathode and anode catalyst layers, and ultimately ensures the high efficiency of continuous production of multifunctional CCM.

[0023] (3) The present invention combines two coating methods to achieve compatible manufacturing with double-sided, continuous coating in one step. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the device of the present invention; Figure 2 This is a cross-sectional view of the membrane electrode CCM. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figure 1 and 2As shown, an apparatus for continuously manufacturing a multifunctional membrane electrode assembly (CCM) for a fuel cell is disclosed. The multifunctional CCM includes a proton exchange membrane 100, a cathode catalyst layer 200 disposed on one side of the proton exchange membrane 100, an anode functional catalyst layer 300 disposed on the other side of the proton exchange membrane 100, and an anode catalyst layer 400 disposed on the anode functional catalyst layer 300. The cathode catalyst layer is composed of an oxygen reduction catalyst and an ionomer, with a thickness of 8-15 μm. The oxygen reduction catalyst includes Pt / C and PtCo / C catalysts, and the ionomer includes Chemours D2020 and Solvay D79. The oxygen reduction catalyst and the ionomer are arranged in an I / C ratio of 0.6-1.0 to form the cathode catalyst layer. The anode functional catalyst layer is composed of an oxygen evolution catalyst and an ionomer, with a thickness of less than 3 μm. The oxygen evolution catalyst includes iridium oxide, and the ionomer is Solvay D79. The anode functional layer is composed of D72 catalyst and ionomer at a mass ratio of 4-6; the anode catalyst layer is composed of hydroxide catalyst and ionomer, with a thickness of 3-5 μm. The hydroxide catalyst is a Pt / C catalyst, and the ionomers include Chemours D2020, D520, Solvay D79, D72, etc. The anode catalyst layer is composed of hydroxide catalyst and ionomer at an I / C ratio of 0.6-1.0.

[0027] The device of the present invention has a feeding unit 1 and a receiving unit 27 at the head and tail, respectively. The feeding unit 1 is wound with a proton exchange membrane 100 for feeding, and the receiving unit 27 is used to wind up the proton exchange membrane 100 coated with a cathode catalytic layer 200, an anode functional catalytic layer 300 and an anode catalytic layer 400.

[0028] A guide roller assembly is provided between the feeding unit 1 and the receiving unit 27 for traction and positioning of the proton exchange membrane 100. The guide roller assembly includes several guide rollers arranged along the traveling direction of the proton exchange membrane 100.

[0029] The guide roller assembly divides the proton exchange membrane 100 into a first traveling section and a second traveling section. The cathode catalytic layer 200 is completed in the first traveling section, and the anode functional catalytic layer 300 and the anode catalytic layer 400 are completed in the second traveling section.

[0030] Specifically, a cathode slit coating unit 4 is provided at the beginning of the first traveling section. The cathode slit coating unit 4 is used to coat a cathode catalyst layer 200 on one side of the proton exchange membrane 100. After being led out from the feeding unit 1, the proton exchange membrane 100 is pulled to the first traveling section by the first guide roller 2 and the second guide roller 3. The feeding unit 1, the first guide roller 2 and the second guide roller 3 are located on a straight line and are set at an angle to the first traveling section, which facilitates the stretching, positioning and traction of the proton exchange membrane 100.

[0031] A first drying unit 5 is located behind the cathode slit coating unit 4 in the first traveling section (the part closer to the feeding unit is the front, and the part closer to the receiving unit is the rear in the direction of the proton exchange membrane travel). The first drying unit 5 is used to dry the cathode catalyst layer 200. The first drying unit 5 also includes an exhaust system that can remove the evaporated solvent.

[0032] At the end of the first traveling section, a cathode protective film feeding unit 9 and a first pressure roller 11 are provided. The cathode protective film feeding unit 9 is used to provide the cathode protective film, and the first pressure roller 11 abuts against the proton exchange membrane 100 to attach the cathode protective film to the cathode catalyst layer 200 for protection. In addition, the line connecting the cathode protective film feeding unit 9 and the first pressure roller 11 is set at an angle to the first traveling section to facilitate the stretching and application of the cathode protective film. A ninth guide roller 10 for traction is also provided between the cathode protective film feeding unit 9 and the first pressure roller 11.

[0033] The device of the present invention also includes a flipping unit, which is used to adjust the first traveling segment to the second traveling segment. In this embodiment, the flipping unit includes a pair of flipping rollers 13 and 14 that are spaced apart and abut against the proton exchange membrane 100. The line connecting the two flipping rollers is perpendicular to the first traveling segment and the second traveling segment. The first traveling segment and the second traveling segment are horizontally arranged and move in a 180-degree direction. That is, the flipping unit realizes a 180-degree flip of the proton exchange membrane 100 during its travel.

[0034] In this embodiment, a base film is disposed on the anode side of the proton exchange membrane 100. The base film needs to be peeled off before the 180-degree flip. The device of the present invention also includes a peeling roller 6 and a base film winding unit at the end of the first traveling section. The peeling roller 6 abuts against the proton exchange membrane 100 to peel off the base film, and the base film winding unit winds up the peeled base film. Furthermore, the line connecting the peeling roller 6 and the base film winding unit is angled with the first traveling section to facilitate the stretching and winding of the base film. A tenth guide roller 7 for traction is also disposed between the peeling roller 6 and the base film winding unit.

[0035] The proton exchange membrane 100 is pulled to the flipping unit by the third guide roller 12 and flipped 180 degrees under the action of the flipping unit, at which time the uncoated side is facing up.

[0036] An anode ultrasonic spraying unit 16 is provided at the beginning of the second travel section. The anode ultrasonic spraying unit 16 is used to spray an anode functional catalyst layer 300 on the other side of the proton exchange membrane 100.

[0037] The second section is equipped with a second drying unit 17, which is used to dry the anode functional catalyst layer 300. The second drying unit 17 also includes an exhaust system that can remove the evaporated solvent.

[0038] The proton exchange membrane 100 moves toward the take-up unit 27 under the traction of the fourth guide roller 15, the fifth guide roller 18, the sixth guide roller 21, the seventh guide roller 25 and the eighth guide roller 26. The take-up unit 27, the seventh guide roller 25 and the eighth guide roller 26 are located on a straight line and are set at an angle to the second traveling section, which facilitates the stretching and winding of the proton exchange membrane 100.

[0039] The second travel section is located behind the second drying unit 17 and includes an anode slit coating unit 19, which is used to coat the anode functional catalyst layer 400 onto the anode catalytic layer 300. The second travel section is also located behind the anode slit coating unit 19 and includes a third drying unit 20, which is used to dry the anode catalytic layer 400. The third drying unit 20 also includes a ventilation system to remove the evaporated solvent.

[0040] At the end of the second traveling section, an anode protective film feeding unit 22 and a second pressure roller 24 are provided. The anode protective film feeding unit 19 is used to provide the anode protective film, and the second pressure roller 24 abuts against the proton exchange membrane 100 to attach the anode protective film to the anode catalyst layer 400 for protection. In addition, the line connecting the anode protective film feeding unit 22 and the second pressure roller 24 is set at an angle to the second traveling section to facilitate the stretching and application of the anode protective film. An eleventh guide roller 23 for traction is also provided between the anode protective film feeding unit 22 and the second pressure roller 24.

[0041] A method for continuously manufacturing a fuel cell membrane electrode (CCM) includes the following steps: Step 1: The feeding unit provides the proton exchange membrane, which enters the cathode slit coating unit under the traction of the guide roller group; Step 2: The cathode slit coating unit begins coating. The start and stop times and the width of the coating are set according to the pattern requirements. The coating method can be intermittent or full coating. Then, the proton exchange membrane with one side coated is dried by the drying unit, so that one side of the proton exchange membrane forms a cathode catalyst layer. Step 3: After drying, the proton exchange membrane is peeled off by the peeling rail. The peeled base membrane is then wound up by the base membrane winding unit. After the base membrane is peeled off, the uncoated side of the proton exchange membrane is exposed and will be turned over by the flipping unit. Step 4: The cathode protective film feeding unit provides the cathode protective film. Under the action of the first pressure roller, the protective film is attached to the cathode catalyst layer, and the proton exchange membrane begins to enter the flipping unit. Step 5: The proton exchange membrane with cathode protective film in the cathode catalyst layer enters the flipping unit. First, the proton exchange membrane is flipped 90° by the first flipping roller, and then flipped 90° again by the second flipping roller. After two consecutive flips, the proton exchange membrane can be flipped 180° so that the uncoated side faces upward. Step 6: The proton exchange membrane, after being rotated 180°, enters the anode ultrasonic spraying unit. Then, spraying is performed by controlling the spraying array and stroke. The corresponding spraying area is aligned with the cathode pattern through positioning calibration. Immediately afterwards, the proton exchange membrane with the other side sprayed is dried by the drying unit, so that an ultrathin anode functional catalytic layer is formed on the other side of the proton exchange membrane. This ultrathin anode functional catalytic layer can be a hydrophilic layer or an electrolysis catalytic layer. Step 7: The proton exchange membrane with the anodic functional catalyst layer enters the anodic slit coating unit for coating. Similar to step 2, the anodic slit coating unit starts coating according to the set feeding parameters and coating parameters, and sets the start and stop and width of coating according to the pattern requirements. Then it is dried by the drying unit, so that the anodic catalyst layer is formed on the anodic functional catalyst layer. Step 8: The anode protective film feeding unit provides the anode protective film. Under the action of the second pressure roller, the protective film is applied to the anode catalyst layer. The proton exchange membrane with double-sided coating is pulled to the receiving unit by the guide roller group and wound up by the receiving unit, completing the continuous manufacturing of the membrane electrode multifunctional CCM.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for continuously manufacturing multifunctional CCM membrane electrode assemblies for fuel cells, characterized in that, The membrane electrode CCM includes a proton exchange membrane, a cathode catalytic layer on one side of the proton exchange membrane, and an anode functional catalytic layer on the other side of the proton exchange membrane. An anode catalytic layer is disposed on the anode functional catalytic layer. The cathode catalytic layer is composed of an oxygen reduction catalyst and an ionomer, and has a thickness of 8-15 μm. The anode functional catalytic layer is composed of an oxygen evolution catalyst and an ionomer, and has a thickness of less than 3 μm. The anode catalytic layer is composed of a hydroxide catalyst and an ionomer, and has a thickness of 3-5 μm. The device includes: The feeding unit is used to supply proton exchange membranes; A guide roller assembly is used for traction and positioning of the proton exchange membrane. The guide roller assembly includes several guide rollers arranged along the travel direction of the proton exchange membrane, and the guide roller assembly divides the proton exchange membrane into a first travel section and a second travel section. A flipping unit is used to adjust the first traveling segment into the second traveling segment; A cathode slit coating unit is disposed on one of the first and second traveling sections and is used to coat a cathode catalyst layer on one side of the proton exchange membrane. An anode ultrasonic spraying unit is set on another section of the first and second traveling sections, and is used to spray an anode functional catalyst layer on the other side of the proton exchange membrane; An anode slit coating unit is disposed on the traveling section where the anode ultrasonic spraying unit is located, and is used to coat the anode catalytic layer on the anode functional catalytic layer; The take-up unit is used to wind up the proton exchange membrane that has been coated on both sides; Drying units are provided on both the first and second travel sections to dry the corresponding catalyst layers after coating.

2. The apparatus according to claim 1, characterized in that, The following are respectively provided at the ends of the first and second travel segments: A protective film supply unit is used to provide the protective film. The pressure roller rests against the proton exchange membrane to attach the protective membrane to the catalyst layer.

3. The apparatus according to claim 1, characterized in that, One side of the proton exchange membrane is provided with a base membrane, and at the end of the first traveling segment, there is: A peeling roller, pressed against the proton exchange membrane, is used to peel off the base membrane; The base film winding unit is used to wind up the peeled base film.

4. The apparatus according to claim 1, characterized in that, The flipping unit includes a pair of flipping rollers spaced apart and abutting against the proton exchange membrane. The line connecting the two flipping rollers is perpendicular to the first traveling section and the second traveling section. The first traveling section and the second traveling section are horizontally arranged and their directions are 180 degrees apart.

5. A method for continuously manufacturing a multifunctional CCM (membrane electrode assembly) for a fuel cell, characterized in that, Using the apparatus according to any one of claims 1 to 4, the method comprises the following steps: (1) The feeding unit provides the proton exchange membrane, which enters the cathode slit coating unit under the traction of the guide roller group; (2) The cathode slit coating unit begins coating, and then the proton exchange membrane that has completed one side coating is dried by the drying unit, so that one side of the proton exchange membrane forms a cathode catalyst layer. (3) The proton exchange membrane with the cathode catalyst layer is flipped 180° by the flipping unit so that the uncoated side of the proton exchange membrane faces upward and enters the anode ultrasonic spraying unit under the traction of the guide roller group; (4) The anode ultrasonic spraying unit starts spraying on the other side of the proton exchange membrane. Then the proton exchange membrane that has completed the spraying on the other side is dried by the drying unit, so that the other side of the proton exchange membrane forms an anode functional catalytic layer. (5) The proton exchange membrane with the anodic functional catalyst layer enters the anodic slit coating unit for coating, and then passes through the drying unit for drying, so that the anodic catalyst layer is formed on the anodic functional catalyst layer; (6) The proton exchange membrane with double-sided coating is pulled to the take-up unit by the guide roller group to complete the winding.

6. The method according to claim 5, characterized in that, After steps (2) and (5) are completed, proceed as follows: Step (21): The cathode protective film feeding unit provides the cathode protective film, which is then applied to the cathode catalyst layer under the action of the first pressure roller. Step (51): The anode protective film feeding unit provides the anode protective film, which is then applied to the anode catalyst layer by the action of the second pressure roller.

7. The method according to claim 5, characterized in that, After step (2) is completed, step (22) is performed: the base film on the surface of the proton exchange membrane is peeled off under the action of the peeling roller, and the peeled base film is wound up by the base film winding unit.

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