Production equipment and production process of CCM membrane electrode

Abstract

The invention provides production equipment and a production process of a CCM membrane electrode, and particularly relates to the technical field of membrane electrodes. The production equipment comprises a first unwinding device, a first coating device, a first drying device, a second coating device, a second drying device and a first winding device which are sequentially arranged, the conveying rollers are arranged between any two adjacent devices; and the second coating device comprises a vacuum adsorption roller which is used for adsorbing and fixing a film material to be coated. According to the production equipment of the CCM membrane electrode, the coating process is continuously carried out; and meanwhile, the mechanical degree of the equipment is high, the controllability is strong, the difference between batches is reduced, the product quality is stable, and the yield is improved. And meanwhile, a vacuum adsorption roller is arranged in the secondary coating device, the film material is fixed through adsorption, and support is provided for the film material, so that coating is more uniform, and the problems of swelling and deformation of the film are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of membrane electrodes, and in particular to a production device and a production process for a CCM membrane electrode. Background Art

[0002] Membrane electrode is the core component of proton exchange membrane fuel cell, which consists of proton exchange membrane, cathode and anode catalyst layer and cathode and anode gas diffusion layer. Usually, the preparation methods of membrane electrode can be divided into two categories, one is direct coating method, that is, coating or spraying catalyst ink directly onto proton exchange membrane; the other is transfer method, that is, coating catalyst ink onto special transfer membrane first, and then transferring it onto proton exchange membrane by hot pressing.

[0003] The CCM transfer method has problems such as high cost and poor performance. In the direct coating process, the first side is usually supported by the protective film of the proton exchange membrane, which is not easy to swell and deform. However, when the second side is coated, the protective film needs to be removed. The first side coated with the catalytic layer has no protective film support. When the catalyst slurry is coated on the second side of the proton exchange membrane, membrane swelling and deformation problems are prone to occur. If an electrostatic film is set when coating the second side, it is necessary to increase high voltage to generate static electricity. High voltage will increase safety hazards and is not conducive to worker operation. Existing production equipment cannot produce continuously, has low production capacity, and has a low yield rate.

[0004] At the same time, during the operation, the protective film of the proton exchange membrane is covered with glue, and the catalytic layer is easily taken off during the removal process after coating, thereby damaging the catalytic layer; materials such as silicone oil in the glue layer are easy to contaminate the catalytic layer.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] One of the purposes of the present invention is to provide a CCM membrane electrode production equipment to alleviate the technical problems in the prior art that the installation of an electrostatic membrane will increase safety hazards and be inconvenient for workers to operate; the existing equipment cannot produce continuously, has low production capacity, and has a low yield rate.

[0007] The second object of the present invention is to provide a production process for a CCM membrane electrode to alleviate the problem of membrane swelling and deformation that easily occurs during second-side coating in the prior art.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] The first aspect of the present invention provides a CCM membrane electrode production device, comprising a first unwinding device, a first coating device, a first drying device, a second coating device, a second drying device and a first winding device arranged in sequence; and also comprising a conveying roller arranged between any two adjacent devices;

[0010] Wherein, the second coating device comprises a vacuum adsorption roller for adsorbing and fixing the film material to be coated.

[0011] Furthermore, the vacuum adsorption roller has a microporous structure.

[0012] Furthermore, the first drying device and / or the second drying device are each independently a three-stage drying box.

[0013] Furthermore, it also includes a second winding device arranged between the first drying device and the second coating device.

[0014] Furthermore, the second coating device also includes a third unwinding device arranged on one side of the vacuum adsorption roller.

[0015] Preferably, the invention further comprises a third winding device arranged between the second drying device and the first winding device.

[0016] Furthermore, it includes a first unwinding device, a first coating device, a first drying device, a second winding device, a second coating device, a second drying device, a third winding device and a first winding device which are arranged in sequence; and also includes a conveying roller arranged between any two adjacent devices.

[0017] Wherein, the second coating device includes a coating head, a vacuum adsorption roller and a third unwinding device.

[0018] The second aspect of the present invention provides a production process for a CCM membrane electrode, which is mainly produced using the production equipment described above and specifically comprises the following steps:

[0019] A. coating a first catalyst slurry on one side of a proton exchange membrane and drying the slurry to obtain a first catalyst layer;

[0020] B. adsorbing the proton exchange membrane with the first catalyst layer on a vacuum adsorption roller, on which a porous film is provided, coating the second catalyst slurry on the opposite side of the proton exchange membrane and drying it to obtain a CCM membrane electrode.

[0021] Furthermore, the porous film is a hydrophobic, oleophobic and high temperature resistant film.

[0022] Preferably, the porous film is made of ePTFE, PI or PET.

[0023] Preferably, the porous film has a porosity of 40%-70%, a thickness of 10 μm-200 μm, and a pore size of 3 μm-20 μm.

[0024] Furthermore, in step B, the vacuum degree of adsorption is 0.01MPa-0.098MPa.

[0025] Preferably, in step A and step B, the drying temperature is independently 60°C-90°C.

[0026] Furthermore, the thickness of the first catalyst layer is 6 μm-10 μm.

[0027] Preferably, the second catalyst layer has a thickness of 2 μm-5 μm.

[0028] Preferably, in step A and step B, the coating speed is independently 2 m / min-5 m / min.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The CCM membrane electrode production equipment provided by the present invention is provided with a continuous coating, drying and winding and unwinding device, so that the coating process is carried out continuously; at the same time, the equipment has a high degree of mechanization and strong controllability, which reduces the difference between batches, stabilizes the product quality, and improves the yield rate. At the same time, a vacuum adsorption roller is provided in the second coating device, which fixes the membrane material by adsorption, provides support for the membrane material, makes the coating more uniform, and reduces the occurrence of membrane swelling and deformation problems.

[0031] The production process of the CCM membrane electrode provided by the present invention is provided with a porous film on the vacuum adsorption roller, which provides support for the secondary coating of the proton exchange membrane, reduces the occurrence of membrane swelling and deformation problems, and the coating of the obtained CCM membrane electrode is smoother and more uniform, with a coverage rate of at least 97.33%. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A CCM membrane electrode production device provided by the present invention;

[0034] Figure 2 Another CCM membrane electrode production equipment provided by the present invention.

[0035] Icons: 10 - first unwinding device; 20 - first coating device; 30 - first drying device; 40 - second coating device; 41 - vacuum adsorption roller; 42 - third unwinding device; 50 - second drying device; 60 - first winding device; 70 - second winding device; 80 - third winding device; 90 - conveying roller. DETAILED DESCRIPTION

[0036] The embodiments of the present invention will be described in detail below in conjunction with the embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The first aspect of the present invention provides a CCM membrane electrode production device, such as Figure 1 As shown, it includes a first unwinding device 10, a first coating device 20, a first drying device 30, a second coating device 40, a second drying device 50 and a first winding device 60 which are arranged in sequence; and also includes a conveying roller 90 which is arranged between any two adjacent devices;

[0038] The second coating device 40 includes a vacuum adsorption roller 41 for adsorbing and fixing the film material to be coated.

[0039] The CCM membrane electrode production equipment provided by the present invention is provided with a continuous coating, drying and winding and unwinding device, so that the coating process is carried out continuously; at the same time, the equipment has a high degree of mechanization and strong controllability, which reduces the difference between batches, stabilizes the product quality, and improves the yield rate. At the same time, a vacuum adsorption roller is provided in the second coating device, which fixes the membrane material by adsorption, provides support for the membrane material, makes the coating more uniform, and reduces the occurrence of membrane swelling and deformation problems.

[0040] The second drying device 50 and the first winding device 60 also include a transfer roller 90 disposed between any two adjacent devices;

[0041] The second coating device 40 includes a vacuum adsorption roller 41 for adsorbing and fixing the film material to be coated. The diameter of the vacuum adsorption roller 41 is greater than 600 mm.

[0042] In some embodiments of the present invention, the vacuum adsorption roller 41 has a microporous structure, and the pore size of the micropores is less than 20 μm. The microporous structure is used to generate suction to adsorb and fix the proton exchange membrane.

[0043] In some embodiments of the present invention, the first drying device 30 and / or the second drying device 50 are each independently a three-stage drying box.

[0044] In some embodiments of the present invention, a second winding device 70 disposed between the first drying device 30 and the second coating device 40 is further included.

[0045] In some embodiments of the present invention, the second coating device 40 also includes a third unwinding device 42 arranged on one side of the vacuum adsorption roller 41. The third unwinding device 42 is used for unwinding the porous film. Adding a layer of porous film between the proton exchange membrane and the vacuum adsorption roller 41 can concentrate the vacuum adsorption force, making the proton exchange membrane flat and not easy to wrinkle and fall off.

[0046] In some embodiments of the present invention, a third winding device 80 is further included, which is disposed between the second drying device 50 and the first winding device 60 and is used for winding the porous film.

[0047] In some preferred embodiments of the present invention, the third unwinding device 42 and the third winding device 80 are simplified to two conveying rollers 90, such as Figure 2 As shown, the conveying roller 90 is used to convey the porous film for circulation in the second coating device 40 and the second drying device 50 .

[0048] In some embodiments of the present invention, a first unwinding device 10, a first coating device 20, a first drying device 30, a second winding device 70, a second coating device 40, a second drying device 50, a third winding device 80 and a first winding device 60 are arranged in sequence; and a conveying roller 90 is also arranged between any two adjacent devices.

[0049] The second coating device 40 includes a coating head, a vacuum adsorption roller 41 and a third unwinding device 42 .

[0050] In some embodiments of the present invention, the first unwinding device 10 is loaded with a proton exchange membrane roll, which is transferred to the first coating device 20 through the transfer roller 90 for coating the first catalyst layer; the first coating device 20 is connected to a slurry supply device, and then the first catalyst layer is dried in the first drying device 30. At the same time, the second winding device 70 tears off the protective film on the proton exchange membrane for recycling.

[0051] The proton exchange membrane with the first catalyst layer is conveyed by the conveying roller 90 to the vacuum adsorption roller 41 in the second coating device 40. At the same time, the third unwinding device 42 conveys the porous film to the vacuum adsorption roller 41. The two membranes arrive at the upper part of the vacuum adsorption roller 41 at the same time. The second coating device 40 coats the second catalyst layer, and then dries it through the second drying device 50 to form the second catalyst layer. After passing through the conveying roller 90, it begins to be rolled up. The third winding device 80 is used to roll up the porous film, and the first winding device 60 rolls up the CCM membrane electrode.

[0052] The second aspect of the present invention provides a production process for a CCM membrane electrode, which is mainly produced using the production equipment described above and specifically comprises the following steps:

[0053] A. coating a first catalyst slurry on one side of a proton exchange membrane and drying the slurry to obtain a first catalyst layer;

[0054] B. adsorbing the proton exchange membrane with the first catalyst layer on a vacuum adsorption roller, on which a porous film is provided, coating the second catalyst slurry on the opposite side of the proton exchange membrane and drying it to obtain a CCM membrane electrode.

[0055] The production process of the CCM membrane electrode provided by the present invention is provided with a porous film on the vacuum adsorption roller, which provides support for the secondary coating of the proton exchange membrane, reduces the occurrence of membrane swelling and deformation problems, and the coating of the obtained CCM membrane electrode is smoother and more uniform, with a coverage rate of at least 97.33%.

[0056] Preferably, the porous film is a hydrophobic, oleophobic and high temperature resistant film.

[0057] Furthermore, the porous film is made of ePTFE, PI or PET.

[0058] It should be noted that ePTFE refers to expanded polytetrafluoroethylene; PI refers to polyimide; and PET refers to polyethylene terephthalate.

[0059] Preferably, the porous film has a porosity of 40%-70%, a thickness of 10 μm-200 μm, and a pore size of 3 μm-20 μm.

[0060] In some embodiments of the present invention, the porosity of the porous film is typically but not limited to 40%, 50%, 60% or 70%; the thickness is typically but not limited to 10μm, 30μm, 50μm, 100μm, 150μm or 200μm; the pore size is typically but not limited to 3μm, 5μm, 7μm, 11μm, 15μm or 20μm.

[0061] Furthermore, in step B, the vacuum degree of adsorption is 0.01MPa-0.098MPa.

[0062] When the vacuum degree of adsorption is less than 0.01 MPa, the adsorption force provided is insufficient; when the vacuum degree of adsorption is greater than 0.098 MPa, the adsorption force is too large, which easily causes the rupture of the porous film and the proton exchange membrane. In some embodiments of the present invention, the vacuum degree of adsorption is typically but not limited to 0.01 MPa, 0.02 MPa, 0.03 MPa, 0.04 MPa, 0.05 MPa, 0.06 MPa, 0.07 MPa, 0.08 MPa or 0.098 MPa.

[0063] Preferably, in step A and step B, the drying temperature is independently 60°C-90°C. In some embodiments of the present invention, the temperature of the three-stage drying oven used for drying is 70°C-80°C-70°C. The middle temperature is higher than the temperature on both sides because when the slurry first enters the drying oven, it is still in a flowing state, and the low temperature is conducive to the uniform removal of the solvent; the high middle temperature is conducive to drying, and the relatively low temperature in the third stage is conducive to the full removal of the solvent. The gas used for drying is nitrogen.

[0064] Furthermore, the thickness of the first catalyst layer is 6 μm-10 μm.

[0065] Preferably, the second catalyst layer has a thickness of 2 μm-5 μm.

[0066] Preferably, in step A and step B, the coating speed is independently 2 m / min-5 m / min. When the coating speed is lower than 2 m / min, the efficiency is not high; when the coating speed is higher than 5 m / min, a uniform coating cannot be obtained. In some embodiments of the present invention, the coating speed is typically but not limited to 2 m / min, 3 m / min, 4 m / min or 5 m / min.

[0067] The present invention is further described below by specific examples and comparative examples, but it should be understood that these examples are only used for more detailed description and should not be understood as limiting the present invention in any form. The raw materials used in the examples and comparative examples of the present invention, if no specific conditions are specified, are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0068] Example 1

[0069] This embodiment provides a CCM membrane electrode, using Figure 1 The membrane electrode production equipment shown has the following production process:

[0070] 1. Prepare catalyst slurry and inject it into a storage tank connected to the first coating device 20 and the second coating device 40; roll up the proton exchange membrane roll and the porous film roll to the first unwinding device 10 and the third unwinding device 42 respectively, pull the protective film of the proton exchange membrane to the second winding device 70, pull the proton exchange membrane to the first winding device 60, and pull the porous film to the third winding device 80.

[0071] 2. Power on to start transmission and coating. The catalyst slurry is discharged from the first coating device 20 and the second coating device 40. After coating, it is dried in a three-stage drying oven. The drying temperature is 70℃-80℃-70℃. The drying gas is nitrogen. The coating speed is 3m / min. The distance between the coating head and the proton exchange membrane is 100μm and 50μm respectively. The thickness of the first catalytic layer and the second catalytic layer is 8μm and 4μm respectively.

[0072] 3. When the second catalytic layer is coated, the corresponding conveying roller is a vacuum adsorption roller 41, the vacuum degree of the vacuum adsorption roller 41 is 0.03Mpa, the diameter of the vacuum adsorption roller 41 is 650mm, and it has a microporous structure with a pore size of 18μm. The porous film used is an ePTFE film with a thickness of 80μm, a pore size of 5μm, and a porosity of 65%; the CCM with the first catalytic layer and the second catalytic layer passes through the conveying roller 90 and is rolled up by the first winding device 60, and the porous film is rolled up by the third winding device 80 at the same time.

[0073] 4. The CCM having the first catalytic layer and the second catalytic layer is fitted with a frame on all sides, and carbon paper is covered on the surfaces of the first catalytic layer and the second catalytic layer to form a CCM membrane electrode assembly.

[0074] Example 2

[0075] This embodiment provides a CCM membrane electrode. The difference from Embodiment 1 is that the vacuum degree of the vacuum adsorption roller 41 is 0.01 MPa; the thickness of the porous film is 100 μm, and the porosity is 55%. The other raw materials and parameters are the same as those in Embodiment 1 and will not be repeated here.

[0076] Example 3

[0077] This embodiment provides a CCM membrane electrode. The difference from Embodiment 2 is that the vacuum degree of the vacuum adsorption roller 41 is 0.06 MPa. The other raw materials and parameters are the same as those in Embodiment 2 and will not be described again.

[0078] Example 4

[0079] This embodiment provides a CCM membrane electrode. The difference from Embodiment 2 is that the thickness of the porous film is 200 μm. The other raw materials and parameters are the same as those of Embodiment 2 and will not be described again.

[0080] Example 5

[0081] This embodiment provides a CCM membrane electrode. The difference from Embodiment 2 is that the pore size of the porous film is 20 μm. The other raw materials and parameters are the same as those of Embodiment 2 and will not be described again.

[0082] Example 6

[0083] This embodiment provides a CCM membrane electrode. The difference from Embodiment 2 is that the porosity of the porous film is 70%. The other raw materials and parameters are the same as those of Embodiment 2 and will not be described again.

[0084] Example 7

[0085] This embodiment provides a CCM membrane electrode. The difference from Embodiment 2 is that the thickness of the porous film is 10 μm. The other raw materials and parameters are the same as those of Embodiment 2 and will not be described again.

[0086] Comparative Example 1

[0087] This comparative example provides a CCM membrane electrode. Different from Example 1, no porous film is arranged between the vacuum adsorption roller 41 and the second coating device 40. The CCM with the first catalytic layer is directly adsorbed by the vacuum adsorption roller 41 for coating the second catalytic layer. The remaining raw materials and steps are the same as those in Example 1 and will not be repeated here.

[0088] Comparative Example 2

[0089] This comparative example provides a CCM membrane electrode, Figure 1 The difference between the membrane electrode production equipment and the vacuum adsorption roller 41 is that a high-voltage electrostatic adsorption roller is used to replace the vacuum adsorption roller 41. The production process is as follows:

[0090] 1. Prepare catalyst slurry and inject it into a storage tank connected to the first coating device 20 and the second coating device 40; roll up the proton exchange membrane roll and the electrostatic membrane roll to the first unwinding device 10 and the third unwinding device 42 respectively, pull the protective film of the proton exchange membrane to the second winding device 70, pull the proton exchange membrane to the first winding device 60, and pull the electrostatic membrane to the third winding device 80, and at the same time apply a high voltage electric field to the high voltage electrostatic adsorption roller.

[0091] 2. Power on to start transmission and coating. The catalyst slurry is discharged from the first coating device 20 and the second coating device 40. After coating, it is dried in a three-stage drying oven. The drying temperature is 70℃-80℃-70℃. The drying gas is nitrogen. The coating speed is 3m / min. The distance between the coating head and the proton exchange membrane is 100μm and 50μm respectively. The thickness of the first catalytic layer and the second catalytic layer is 8μm and 4μm respectively.

[0092] 3. When the second catalytic layer is coated, the corresponding conveying roller is a high-voltage electrostatic adsorption roller, and the voltage on the high-voltage electrostatic adsorption roller is 40kV. The electrostatic film used is a PI film with a thickness of 80μm; the CCM with the first catalytic layer and the second catalytic layer passes through the conveying roller 90 and is reeled by the first reeling device 60, while the electrostatic film is reeled by the third reeling device 80.

[0093] 4. The CCM having the first catalytic layer and the second catalytic layer is fitted with a frame on all sides, and carbon paper is covered on the surfaces of the first catalytic layer and the second catalytic layer to form a CCM membrane electrode assembly.

[0094] Test Example 1

[0095] The CCM membrane electrodes obtained in Examples 1-7 and Comparative Examples 1-2 were photographed using a metallographic microscope, and the coating coverage of the second catalytic layer was calculated by image processing to compare the coating quality. The obtained data are shown in Table 1 below.

[0096] Table 1

[0097] test Coverage / % Example 1 99.51 Example 2 99.76 Example 3 97.33 Example 4 99.34 Example 5 99.58 Example 6 98.84 Example 7 97.88 Comparative Example 1 83.26 Comparative Example 2 97.09

[0098] As can be seen from Table 1, increasing the vacuum degree, reducing the thickness of the porous membrane within a certain range (too thin porous membrane is not easy to be flat, resulting in a decrease in the actual vacuum degree), and increasing the porosity can effectively adsorb the proton exchange membrane, make the membrane flatter, and improve the quality of the CCM coating. In Comparative Example 1, there was no adsorption force when the second side was coated, and the proton membrane had no support and fixation, resulting in swelling and deformation of the membrane during coating, and poor coating quality. The electrostatic adsorption used in Comparative Example 2 easily adsorbed dust particles and water vapor, which would cause mixing during coating, causing the membrane to swell slightly and deform, and there were a few cracks in the coating.

[0099] Test Example 2

[0100] The CCM membrane electrodes obtained in Examples 1-7 and Comparative Examples 1-2 were tested with a test area of ​​25 cm 2 The test conditions are temperature 80℃, anode and cathode humidity 40% / 50%, cathode and cathode metering ratio 1.9 / 1.5, cathode and cathode back pressure 250KPa / 260KPa. The current density is recorded as 2.2A / cm 2 The voltage values ​​under the conditions are shown in Table 2 below.

[0101] Table 2

[0102] test <![CDATA[Voltage / V @ 2.2 A / cm 2 > Example 1 0.401 Example 2 0.437 Example 3 0.359 Example 4 0.362 Example 5 0.396 Example 6 0.403 Example 7 0.344 Comparative Example 1 0.308 Comparative Example 2 0.342

[0103] As can be seen from Table 2, by using the equipment and process of the present invention, the performance of CCM prepared by optimizing factors such as vacuum degree, porous film thickness, porosity, etc. is better than that of no adsorption and electrostatic adsorption. This is mainly because this process has appropriate adsorption force on the proton membrane, so that the proton membrane does not swell and deform during coating, and the coating quality has no obvious cracks, so that the obtained CCM has higher performance.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A CCM membrane electrode production equipment, characterized in that: It includes a first unwinding device, a first coating device, a first drying device, a second coating device, a second drying device and a first winding device which are arranged in sequence; and it also includes a conveying roller arranged between any two adjacent devices; Wherein, the second coating device comprises a vacuum adsorption roller for adsorbing and fixing the film material to be coated.

2. The production equipment according to claim 1, characterized in that: The vacuum adsorption roller has a microporous structure.

3. The production equipment according to claim 1, characterized in that: The first drying device and / or the second drying device are each independently a three-stage drying box.

4. The production equipment according to claim 1, characterized in that: The invention also includes a second winding device disposed between the first drying device and the second coating device.

5. The production equipment according to claim 1, characterized in that: The second coating device also includes a third unwinding device disposed on one side of the vacuum adsorption roller; Preferably, the invention further comprises a third winding device arranged between the second drying device and the first winding device.

6. The production equipment according to claim 1, characterized in that: It includes a first unwinding device, a first coating device, a first drying device, a second winding device, a second coating device, a second drying device, a third winding device and a first winding device which are arranged in sequence; and it also includes a conveying roller arranged between any two adjacent devices; Wherein, the second coating device includes a coating head, a vacuum adsorption roller and a third unwinding device.

7. A production process of a CCM membrane electrode, characterized in that: The production is mainly carried out using the production equipment described in any one of claims 1 to 6, and specifically includes the following steps: A. coating a first catalyst slurry on one side of a proton exchange membrane and drying the slurry to obtain a first catalyst layer; B. adsorbing the proton exchange membrane with the first catalyst layer on a vacuum adsorption roller, on which a porous film is provided, coating the second catalyst slurry on the opposite side of the proton exchange membrane and drying it to obtain a CCM membrane electrode.

8. The production process according to claim 7, characterized in that: The porous film is a hydrophobic, oleophobic and high temperature resistant film; Preferably, the porous film is made of ePTFE, PI or PET; Preferably, the porous film has a porosity of 40%-70%, a thickness of 10 μm-200 μm, and a pore size of 3 μm-20 μm.

9. The production process according to claim 7, characterized in that: In step B, the vacuum degree of adsorption is 0.01MPa-0.098MPa; Preferably, in step A and step B, the drying temperature is independently 60°C-90°C.

10. The production process according to claim 7, characterized in that: The thickness of the first catalyst layer is 6 μm-10 μm; Preferably, the thickness of the second catalyst layer is 2 μm-5 μm; Preferably, in step A and step B, the coating speed is independently 2 m / min-5 m / min.

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