Gas Diffusion Layer Fixing Process

Abstract

The present invention provides a fixing process of a gas diffusion layer, comprising the following steps: providing a five-in-one membrane electrode, the five-in-one membrane electrode comprising a first surface, and placing the five-in-one membrane electrode on a hot pressing tool; providing a first adhesive material, the first adhesive material comprising a first adhesive layer, a first release film and a second release film, cutting the first release film and the first adhesive layer to form an incision; removing the first release film located on one side of the incision to expose a portion of the first adhesive layer, and setting the exposed first adhesive layer as a first adhesive layer portion, and setting the remaining first adhesive layer as a second adhesive layer portion; removing the remaining first release film, and placing the first adhesive layer and the second release film on the first surface, and making the first adhesive layer portion bond to the first surface; and bonding the first gas diffusion layer to the first adhesive layer portion. The present invention can effectively fix the gas diffusion layer, and has high positioning accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to an ultra-black composite coating and a preparation method thereof. Background Art

[0002] A fuel cell is an electrochemical cell whose main principle is to convert the chemical energy in the fuel and oxidant directly into electrical energy through a redox reaction. Among them, proton exchange membrane fuel cells, as an important branch in the field of fuel cells, have the general characteristics of fuel cells and also have outstanding advantages such as fast start-up speed at room temperature, small size, no electrolyte loss, easy drainage, long life, high specific power and specific energy.

[0003] The core component of the proton exchange membrane fuel cell is the membrane electrode, which is the place where the fuel cell performs redox reactions. It is mainly composed of a gas diffusion layer (GDL), a catalyst layer (CL), and a proton exchange membrane (PEM). At present, the method of applying glue or dispensing glue on the GDL, and then bonding and curing it with the frame membrane is usually adopted. However, when the laboratory prepares the membrane electrode for testing, the reaction area is generally less than or equal to 100 square centimeters, and the number of samples is small. If glue is used for fixing, the process requirements are high, the positioning accuracy is low, and the glue cannot be used up at one time, resulting in waste. Summary of the invention

[0004] Based on this, it is necessary to provide a gas diffusion layer fixing process that can solve the above problems.

[0005] At least one embodiment of the present invention provides a gas diffusion layer fixing process, comprising the following steps:

[0006] Providing a five-in-one membrane electrode, the five-in-one membrane electrode comprising a first surface and a second surface opposite to the first surface, and placing the five-in-one membrane electrode on a hot pressing tool;

[0007] Providing a first adhesive material, the first adhesive material comprising a first adhesive layer and a first release film and a second release film respectively located on two opposite surfaces of the first adhesive layer, and cutting the first release film and the first adhesive layer along a direction from the first release film to the second release film to form an incision;

[0008] Removing the first release film located at one side of the incision to expose a portion of the first adhesive layer, and setting the exposed first adhesive layer as a first adhesive layer portion, and setting the remaining first adhesive layer as a second adhesive layer portion;

[0009] removing the remaining first release film, and placing the first adhesive layer and the second release film on the first surface, and making the first adhesive layer partially bonded to the first surface;

[0010] removing the second release film and the second adhesive layer; and

[0011] The first gas diffusion layer is bonded to the first glue layer portion.

[0012] In some embodiments, after placing the five-in-one membrane electrode on a hot pressing tool and before placing the first adhesive layer and the second release film on the first surface, the fixing process further includes the following steps:

[0013] Cutting the first positioning frame gasket so that the first positioning frame gasket after cutting has a first inner frame and a first outer frame; and

[0014] placing the cut first positioning frame gasket on the first surface;

[0015] Wherein, the first adhesive layer and the second release film are placed in the first inner frame and on the first surface;

[0016] After bonding the first gas diffusion layer to the first glue layer portion, the fixing process further comprises the following steps:

[0017] Remove the first positioning frame gasket.

[0018] In some embodiments, the five-in-one membrane electrode comprises a first positioning member, the hot pressing tool comprises a second positioning member, and the first positioning frame gasket comprises a third positioning member;

[0019] The process of placing the five-in-one membrane electrode on a hot pressing tool specifically includes:

[0020] Placing the five-in-one membrane electrode on a hot pressing tool by aligning the first positioning member and the second positioning member;

[0021] Placing the cut first positioning frame gasket on the first surface specifically includes:

[0022] The cut first positioning frame gasket is placed on the first surface by aligning the third positioning member and the second positioning member.

[0023] In some embodiments, the first positioning member is a positioning hole, the second positioning member is a positioning pin, and the third positioning member is a positioning hole.

[0024] In some embodiments, bonding the first gas diffusion layer to the first adhesive layer portion specifically comprises the following steps:

[0025] placing the first gas diffusion layer in the first inner frame by a positioning device; and

[0026] The first gas diffusion layer is bonded to the first glue layer portion.

[0027] In some embodiments, the first adhesive layer is a double-sided adhesive, and the adhesion between the first release film and the first adhesive layer is smaller than the adhesion between the second release film and the first adhesive layer.

[0028] In some embodiments, the fixing process further comprises the following steps:

[0029] Providing a second adhesive material, the second adhesive material comprising a second adhesive layer and a third release film and a fourth release film respectively located on two opposite surfaces of the second adhesive layer, and cutting the third release film and the second adhesive layer along a direction from the third release film to the fourth release film to form an incision;

[0030] Removing the third release film located at one side of the incision to expose a portion of the second adhesive layer, and setting the exposed second adhesive layer as the third adhesive layer portion, and the remaining second adhesive layer as the fourth adhesive layer portion;

[0031] removing the remaining third release film, and placing the second adhesive layer and the fourth release film on the second surface, and making the fourth adhesive layer partially bonded to the second surface;

[0032] removing the fourth release film and the fourth adhesive layer portion; and

[0033] The second gas diffusion layer is bonded to the third glue layer portion.

[0034] At least one embodiment of the present invention provides a gas diffusion layer fixing process, comprising the following steps:

[0035] Providing a five-in-one membrane electrode, the five-in-one membrane electrode comprising a first surface and a second surface opposite to the first surface, and placing the five-in-one membrane electrode on a hot pressing tool;

[0036] Providing a first adhesive material, the first adhesive material comprising a first adhesive layer and a first release film and a second release film respectively located on two opposite surfaces of the first adhesive layer, and cutting the first release film and the first adhesive layer along a direction from the first release film to the second release film to form an incision;

[0037] Removing the first release film located at one side of the incision to expose a portion of the first adhesive layer, and setting the exposed first adhesive layer as a first adhesive layer portion, and setting the remaining first adhesive layer as a second adhesive layer portion;

[0038] removing the remaining first release film, placing the first adhesive layer and the second release film on the first surface, and bonding the first adhesive layer to the first surface by heat pressing;

[0039] Providing a second adhesive material, the second adhesive material comprising a second adhesive layer and a third release film and a fourth release film respectively located on two opposite surfaces of the second adhesive layer, and cutting the third release film and the second adhesive layer along a direction from the third release film to the fourth release film to form an incision;

[0040] Removing the third release film located at one side of the incision to expose a portion of the second adhesive layer, and setting the exposed second adhesive layer as the third adhesive layer portion, and the remaining second adhesive layer as the fourth adhesive layer portion;

[0041] removing the remaining third release film, placing the second adhesive layer and the fourth release film on the second surface, and bonding the fourth adhesive layer to the second surface by heat pressing;

[0042] removing the second release film, the second adhesive layer portion, the fourth release film and the fourth adhesive layer portion; and

[0043] The first gas diffusion layer is bonded to the first glue layer portion by heat pressing, and the second gas diffusion layer is bonded to the third glue layer portion by heat pressing.

[0044] In some embodiments, the fixing process includes at least one of the following (1) to (3):

[0045] (1) The temperature of the hot pressing is 60° C. to 150° C.;

[0046] (2) The hot pressing pressure is 0.2 MPa to 1 MPa;

[0047] (3) The heat pressing time is 10s to 40s.

[0048] In some embodiments, the first adhesive layer is selected from at least one of ethylene-vinyl acetate copolymer hot melt adhesive film, polyamide hot melt adhesive film, polyethylene terephthalate hot melt adhesive film, thermoplastic polyurethane hot melt adhesive film, polyethersulfone hot melt adhesive film and epoxy-based thermosetting adhesive film.

[0049] The present invention uses solid glue to bond the gas diffusion layer to fix the gas diffusion layer. Compared with the prior art process of using liquid glue to fix, the present invention is simple to operate, has high positioning accuracy, good pasting effect, and low material cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A fixed flow chart of the gas diffusion layer provided by the present invention;

[0051] Figure 2 A top view of the five-in-one membrane electrode provided by the present invention after being placed on a hot pressing tool;

[0052] Figure 3 A top view of the first positioning frame gasket provided by the present invention after cutting;

[0053] Figure 4 A cross-sectional view of a first adhesive material provided by the present invention;

[0054] Figure 5 For the general Figure 4 A cross-sectional view of the first adhesive material after cutting is shown;

[0055] Figure 6 For the general Figure 5 The first adhesive material is shown bonded to Figure 2 A top view of the first frame film in the five-in-one membrane electrode shown;

[0056] Figure 7 To fix the first gas diffusion layer to Figure 6 A top view of the first adhesive layer after being installed;

[0057] Figure 8 A top view of the second positioning frame gasket provided by the present invention after cutting;

[0058] Fig. 9 A cross-sectional view of a second adhesive material provided by the present invention;

[0059] Fig.10 For the general Fig. 9 A cross-sectional view of the first adhesive material after cutting is shown;

[0060] Fig.11 For the general Fig.10 The first adhesive material is shown bonded to Figure 2 A top view of the second frame film in the five-in-one membrane electrode shown;

[0061] Fig.12 To fix the second gas diffusion layer to Fig.11 A top view after the third adhesive layer is applied is shown.

[0062] Figure markings: 10-five-in-one membrane electrode; 101-first positioning piece; 20-hot pressing tooling; 30-first positioning frame gasket; 301-third positioning piece; 40-first adhesive material; 401-first adhesive layer; 4011-first adhesive layer portion; 4012-second adhesive layer portion; 402-first release film; 403-second release film; 50-first gas diffusion layer; 60-second positioning frame gasket; 601-fourth positioning piece; 70-second adhesive material; 701-second adhesive layer; 7011-third adhesive layer portion; 7012-fourth adhesive layer portion; 702-third release film; 703-fourth release film; 80-second gas diffusion layer; 100, 200-seven-in-one membrane electrode. DETAILED DESCRIPTION

[0063] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0065] See also Figure 1 At least one embodiment of the present invention provides a gas diffusion layer fixing process, comprising the following steps S101 to S116:

[0066] Step S101, please refer to Figure 2 , providing a five-in-one membrane electrode 10.

[0067] In one embodiment, the five-in-one membrane electrode 10 includes a proton exchange membrane (PEM), a first catalyst layer, a second catalyst layer, a first frame membrane, and a second frame membrane. The first frame membrane, the first catalyst layer, the proton exchange membrane, the second catalyst layer, and the second frame membrane are stacked in sequence.

[0068] The five-in-one membrane electrode 10 includes a first surface and a second surface opposite to the first surface. It can be understood that the first surface is the surface of the first frame membrane away from the proton exchange membrane, and the second surface is the surface of the second frame membrane away from the proton exchange membrane.

[0069] In one embodiment, the five-in-one membrane electrode 10 includes a first positioning member 101. In one embodiment, the first positioning member 101 can be a positioning hole.

[0070] Step S102 , placing the five-in-one membrane electrode 10 on a hot pressing tool 20 .

[0071] In one embodiment, the hot pressing tool 20 includes a second positioning member (not shown). In one embodiment, the second positioning member can be a positioning pin.

[0072] Specifically, the first positioning member 101 (ie, the positioning hole) is aligned with the second positioning member (ie, the positioning pin) so that the five-in-one membrane electrode 10 is placed on the hot pressing tool 20 .

[0073] Step S103, please refer to Figure 3 , use a cutting machine to cut the first positioning frame gasket 30, and place the cut first positioning frame gasket 30 on the first surface, and align the third positioning piece 301 on the first positioning frame gasket 30 with the second positioning piece on the hot pressing tool 20.

[0074] In one embodiment, the third positioning member 301 is a positioning hole.

[0075] like Figure 3 As shown, the first positioning frame gasket 30 after cutting has a first inner frame and a first outer frame.

[0076] In one embodiment, the material of the first positioning frame gasket 30 may be a hard film material. Specifically, the hard film material is selected from at least one of PET (polyethylene terephthalate), PI (polyimide) and PEEK (polyetheretherketone).

[0077] The thickness of the first positioning frame gasket 30 is smaller than the thickness of the first gas diffusion layer (such as Figure 7 In one embodiment, the difference between the thickness of the first positioning frame gasket 30 and the thickness of the first gas diffusion layer subsequently fixed is less than or equal to 30 microns.

[0078] Step S104, please refer to Figure 4 , providing a first adhesive material 40.

[0079] In one embodiment, the first adhesive material 40 includes a first adhesive layer 401 and a first release film 402 and a second release film 403 respectively located on two opposite surfaces of the first adhesive layer 401 .

[0080] In one embodiment, the first adhesive layer 401 is a double-sided adhesive tape. In one embodiment, a PET (polyethylene terephthalate) core may be provided inside the double-sided adhesive tape to increase the hardness of the double-sided adhesive tape. It can be understood that the double-sided adhesive tape has viscosity. That is, the first adhesive layer 401 has viscosity.

[0081] In one embodiment, the thickness of the first adhesive layer 401 is 3 μm to 20 μm. In one embodiment, the thickness of the first release film 402 is less than or equal to 25 μm. In one embodiment, the thickness of the second release film 403 is greater than or equal to 50 μm.

[0082] The adhesion between the first release film 402 and the first adhesive layer 401 is smaller than the adhesion between the second release film 403 and the first adhesive layer 401 .

[0083] Step S105, please refer to Figure 5 , a portion of the first release film 402 is removed to expose a portion of the first adhesive layer 401 , and the exposed first adhesive layer 401 is set as the first adhesive layer portion 4011 , and the remaining first adhesive layer 401 is set as the second adhesive layer portion 4012 .

[0084] Specifically, the first release film 402 and the first adhesive layer 401 are cut along the direction from the first release film 402 to the second release film 403 to form an incision (eg, Figure 5 Then, the first release film 402 located on one side of the incision is removed to expose a portion of the first adhesive layer 401.

[0085] Step S106, please refer to Figure 6 , remove the remaining first release film 402, and place the first adhesive layer 401 and the second release film 403 in the first inner frame of the cut first positioning frame gasket 30, and make the first adhesive layer part 4011 bonded to the first frame film.

[0086] Step S107 , removing the second release film 403 and the second adhesive layer 4012 .

[0087] At this time, only the first adhesive layer portion 4011 remains. In one embodiment, the width of the first adhesive layer portion 4011 is 1.2 mm to 1.5 mm.

[0088] Step S108, please refer to Figure 7 , placing the first gas diffusion layer 50 in the first inner frame of the cut first positioning frame gasket 30 , and bonding the first gas diffusion layer 50 to the first adhesive layer portion 4011 .

[0089] In one embodiment, the size of the first gas diffusion layer 50 may be the same as the size of the first inner frame of the first positioning frame gasket 30 after cutting, so as to improve the positioning accuracy of the first gas diffusion layer 50 .

[0090] In one embodiment, the first gas diffusion layer 50 may also be placed in the first inner frame of the first positioning frame gasket 30 through a positioning device to improve the positioning accuracy of the first gas diffusion layer 50. Specifically, the positioning device is provided with a positioning hole, and the positioning hole of the positioning device is aligned with the second positioning member (i.e., positioning pin) to place the first gas diffusion layer 50 in the first inner frame of the first positioning frame gasket 30.

[0091] Step S109 , removing the first positioning frame gasket 30 .

[0092] So far, the first gas diffusion layer 50 has been fixed on the first surface of the five-in-one membrane electrode 10 .

[0093] Step S110, please refer to Figure 8 , use a cutting machine to cut the second positioning frame gasket 60, and place the cut second positioning frame gasket 60 on the second surface, and align the fourth positioning piece 601 on the second positioning frame gasket 60 with the second positioning piece on the hot pressing tool 20.

[0094] In one embodiment, the fourth positioning member 601 is a positioning hole.

[0095] like Figure 8 As shown, the second positioning frame gasket 60 after cutting has a second inner frame and a second outer frame.

[0096] It can be understood that after step S109 and before step S110, the five-in-one membrane electrode 10 needs to be turned over to expose the second surface so that the second positioning frame gasket 60 can be placed on the second surface.

[0097] In one embodiment, the material of the second positioning frame gasket 60 may be a hard film material. Specifically, the hard film material is selected from at least one of PET (polyethylene terephthalate), PI (polyimide) and PEEK (polyetheretherketone).

[0098] The thickness of the second positioning frame gasket 60 is smaller than the thickness of the second gas diffusion layer (such as Fig.12 In one embodiment, the difference between the thickness of the second positioning frame gasket 60 and the thickness of the second gas diffusion layer fixed subsequently is less than or equal to 30 microns.

[0099] Step S111, please refer to Fig. 9 , providing a second adhesive material 70.

[0100] In one embodiment, the second adhesive material 70 includes a second adhesive layer 701 and a third release film 702 and a fourth release film 703 respectively located on two opposite surfaces of the second adhesive layer 701 .

[0101] In one embodiment, the second adhesive layer 701 is a double-sided adhesive. In one embodiment, a PET (polyethylene terephthalate) core may be provided inside the double-sided adhesive to increase the hardness of the double-sided adhesive. It can be understood that the double-sided adhesive has viscosity. That is, the second adhesive layer 701 has viscosity.

[0102] In one embodiment, the thickness of the second adhesive layer 701 is 3 μm to 20 μm. In one embodiment, the thickness of the third release film 702 is less than or equal to 25 μm. In one embodiment, the thickness of the fourth release film 703 is greater than or equal to 50 μm.

[0103] The adhesion between the third release film 702 and the second adhesive layer 701 is smaller than the adhesion between the fourth release film 703 and the second adhesive layer 701 .

[0104] Step S112, please refer to Fig.10 , remove part of the third release film 702 to expose part of the second adhesive layer 701 , and set the exposed second adhesive layer 701 as the third adhesive layer portion 7011 , and the remaining second adhesive layer 701 as the fourth adhesive layer portion 7012 .

[0105] Specifically, the fourth release film 703 and the second adhesive layer 701 are cut along the direction from the third release film 702 to the fourth release film 703 to form an incision (such as Fig.10 ), and then remove the third release film 702 located on one side of the incision to expose a portion of the second adhesive layer 701.

[0106] Step S113, please refer to Fig.11 , remove the remaining third release film 702, and place the second adhesive layer 701 and the fourth release film 703 in the second inner frame of the cut second positioning frame gasket 60, and make the second adhesive layer part 4012 bonded to the second frame film.

[0107] Step S114 , removing the fourth release film 703 and the fourth adhesive layer 7012 .

[0108] At this time, only the third adhesive layer portion 7011 remains. In one embodiment, the width of the third adhesive layer portion 7011 is 1.2 mm to 1.5 mm.

[0109] Step S115, please refer to Fig.12 , placing the second gas diffusion layer 80 in the second inner frame of the cut second positioning frame gasket 60 , and bonding the second gas diffusion layer 80 to the third adhesive layer portion 7011 .

[0110] In one embodiment, the size of the second gas diffusion layer 80 may be the same as the size of the second inner frame of the second positioning frame gasket 60 after cutting, so as to improve the positioning accuracy of the second gas diffusion layer 80 .

[0111] In one embodiment, the second gas diffusion layer 80 may also be placed in the second inner frame of the second positioning frame gasket 60 through a positioning device to improve the positioning accuracy of the second gas diffusion layer 80. Specifically, the positioning device is provided with a positioning hole, and the positioning hole of the positioning device is aligned with the second positioning member (i.e., positioning pin) to place the second gas diffusion layer 80 in the second inner frame of the second positioning frame gasket 60.

[0112] Step S116 , removing the second positioning frame gasket 60 to obtain the seven-in-one membrane electrode 100 .

[0113] At this point, the second gas diffusion layer 80 has been fixed on the second surface of the five-in-one membrane electrode 10 , thereby obtaining the seven-in-one membrane electrode 100 .

[0114] At least one embodiment of the present invention provides a gas diffusion layer fixing process, comprising the following steps S201 to S213:

[0115] Steps S201 to S203 are respectively the same as steps S101 to S103 , and details may be referred to steps S101 to S103 , which will not be described in detail here.

[0116] Step S204: Please refer again Figure 4 , providing a first adhesive material 40.

[0117] In one embodiment, the first adhesive material 40 includes a first adhesive layer 401 and a first release film 402 and a second release film 403 respectively located on two opposite surfaces of the first adhesive layer 401 .

[0118] In one embodiment, the first adhesive layer 401 is selected from at least one of EVA (ethylene-vinyl acetate copolymer) hot melt adhesive film, PA (polyamide) hot melt adhesive film, PET (polyethylene terephthalate) hot melt adhesive film, TPU (thermoplastic polyurethane) hot melt adhesive film, PES (polyether sulfone) hot melt adhesive film and epoxy-based thermosetting adhesive film. It is understood that the first adhesive layer 401 is not sticky.

[0119] In one embodiment, the thickness of the first adhesive layer 401 is 3 μm to 20 μm. In one embodiment, the thickness of the first release film 402 is less than or equal to 25 μm. In one embodiment, the thickness of the second release film 403 is greater than or equal to 50 μm.

[0120] Step S205: Please refer again Figure 5 , a portion of the first release film 402 is removed to expose a portion of the first adhesive layer 401 , and the exposed first adhesive layer 401 is set as the first adhesive layer portion 4011 , and the remaining first adhesive layer 401 is set as the second adhesive layer portion 4012 .

[0121] Specifically, the first release film 402 and the first adhesive layer 401 are cut along the direction from the first release film 402 to the second release film 403 to form an incision (eg, Figure 5 Then, the first release film 402 located at one side of the incision is removed to expose a portion of the first adhesive layer 401.

[0122] Step S206, please refer to Figure 6 , remove the remaining first release film 402, and place the first adhesive layer 401 and the second release film 403 in the first inner frame of the cut first positioning frame gasket 30, and bond the first adhesive layer part 4011 to the first frame film by hot pressing.

[0123] Step S207: Please refer again Figure 8 , use a cutting machine to cut the second positioning frame gasket 60, and place the cut second positioning frame gasket 60 on the second surface, and align the fourth positioning piece 601 on the second positioning frame gasket 60 with the second positioning piece on the hot pressing tool 20.

[0124] In one embodiment, the fourth positioning member 601 is a positioning hole.

[0125] like Figure 8 As shown, the second positioning frame gasket 60 after cutting has a second inner frame and a second outer frame.

[0126] It can be understood that after step S206 and before step S207, the five-in-one membrane electrode 10 needs to be turned over to expose the second surface so that the second positioning frame gasket 60 can be placed on the second surface.

[0127] In one embodiment, the material of the second positioning frame gasket 60 may be a hard film material. Specifically, the hard film material is selected from at least one of PET (polyethylene terephthalate), PI (polyimide) and PEEK (polyetheretherketone).

[0128] The thickness of the second positioning frame gasket 60 is smaller than the thickness of the second gas diffusion layer (such as Fig.12 In one embodiment, the difference between the thickness of the second positioning frame gasket 60 and the thickness of the second gas diffusion layer fixed subsequently is less than or equal to 30 microns.

[0129] Step S208: Please refer to Fig. 9 , providing a second adhesive material 70.

[0130] In one embodiment, the second adhesive material 70 includes a second adhesive layer 701 and a third release film 702 and a fourth release film 703 respectively located on two opposite surfaces of the second adhesive layer 701 .

[0131] In one embodiment, the second adhesive layer 701 is selected from at least one of EVA (ethylene-vinyl acetate copolymer) hot melt adhesive film, PA (polyamide) hot melt adhesive film, PET (polyethylene terephthalate) hot melt adhesive film, TPU (thermoplastic polyurethane) hot melt adhesive film, PES (polyether sulfone) hot melt adhesive film and epoxy-based thermosetting adhesive film. It is understood that the second adhesive layer 701 is not sticky.

[0132] In one embodiment, the thickness of the second adhesive layer 701 is 3 μm to 20 μm. In one embodiment, the thickness of the third release film 702 is less than or equal to 25 μm. In one embodiment, the thickness of the fourth release film 703 is greater than or equal to 50 μm.

[0133] Step S209, please refer again Fig.10 , remove part of the third release film 702 to expose part of the second adhesive layer 701 , and set the exposed second adhesive layer 701 as the third adhesive layer portion 7011 , and the remaining second adhesive layer 701 as the fourth adhesive layer portion 7012 .

[0134] Specifically, the fourth release film 703 and the second adhesive layer 701 are cut along the direction from the third release film 702 to the fourth release film 703 to form an incision (such as Fig.10 ), and then remove the third release film 702 located on one side of the incision to expose a portion of the second adhesive layer 701.

[0135] Step S210, please refer to Fig.11 , remove the remaining third release film 702, and place the second adhesive layer 701 and the fourth release film 703 in the second inner frame of the cut second positioning frame gasket 60, and bond the second adhesive layer part 4012 to the second frame film by hot pressing.

[0136] Step S211 , removing the second release film 403 , the second adhesive layer portion 4012 , the fourth release film 703 and the fourth adhesive layer portion 7012 .

[0137] At this time, only the first adhesive layer portion 4011 and the third adhesive layer portion 7011 remain. In one embodiment, the width of the first adhesive layer portion 4011 is 1.2 mm to 1.5 mm. In one embodiment, the width of the third adhesive layer portion 7011 is 1.2 mm to 1.5 mm.

[0138] Step S212: Please refer to Fig.12 The first gas diffusion layer 50 is bonded to the first glue layer portion 4011 and the second gas diffusion layer 80 is bonded to the third glue layer portion 7011 by hot pressing.

[0139] In one embodiment, the temperature of the hot pressing is 60° C. to 150° C. If the temperature of the hot pressing is too high, the five-in-one membrane electrode 10 will be damaged.

[0140] In one embodiment, the hot pressing pressure is 0.2 MPa to 1 MPa. If the hot pressing pressure is too high, the first gas diffusion layer 50, the second gas diffusion, the first positioning frame gasket 30 and the second positioning frame gasket 60 will be damaged, and the pressurization time of the equipment will be longer.

[0141] In one embodiment, the heat pressing time is 10s to 40s. If the heat pressing time is too long, the production efficiency will be reduced.

[0142] In one embodiment, the size of the first gas diffusion layer 50 may be the same as the size of the first inner frame of the first positioning frame gasket 30 after cutting, so as to improve the positioning accuracy of the first gas diffusion layer 50 .

[0143] In one embodiment, the first gas diffusion layer 50 may also be placed in the first inner frame of the first positioning frame gasket 30 through a positioning device to improve the positioning accuracy of the first gas diffusion layer 50. Specifically, the positioning device is provided with a positioning hole, and the positioning hole of the positioning device is aligned with the second positioning member (i.e., positioning pin) to place the first gas diffusion layer 50 in the first inner frame of the first positioning frame gasket 30.

[0144] In one embodiment, the size of the second gas diffusion layer 80 may be the same as the size of the second inner frame of the second positioning frame gasket 60 after cutting, so as to improve the positioning accuracy of the second gas diffusion layer 80 .

[0145] In one embodiment, the second gas diffusion layer 80 may also be placed in the second inner frame of the second positioning frame gasket 60 through a positioning device to improve the positioning accuracy of the second gas diffusion layer 80. Specifically, the positioning device is provided with a positioning hole, and the positioning hole of the positioning device is aligned with the second positioning member (i.e., positioning pin) to place the second gas diffusion layer 80 in the second inner frame of the second positioning frame gasket 60.

[0146] Step S213 , removing the first positioning frame gasket 30 and the second positioning frame gasket 60 to obtain the seven-in-one membrane electrode 200 .

[0147] The present invention uses solid glue to bond the gas diffusion layer to fix the gas diffusion layer. Compared with the prior art process of using liquid glue to fix, the present invention is simple to operate, has high positioning accuracy, good pasting effect, and low material cost. The present invention only needs to use a small press and a cutting machine.

[0148] In addition, the present invention uses adhesive materials to effectively fix the gas diffusion layer, so that when assembling a single cell test, the consistency is high, reducing the error caused by using the gas diffusion layer to assemble a single cell test separately. In a conventional laboratory environment, the preservation state is better. At the same time, the fixing process of the present invention can replace the hot melt glue dispensing process, which is more convenient and cost-saving in laboratory use scenarios.

[0149] The present invention is further described below by means of specific examples and comparative examples.

[0150] Example 1

[0151] (1) A five-in-one membrane electrode is provided, wherein the five-in-one membrane electrode comprises a proton exchange membrane, a first catalyst layer, a second catalyst layer, a first frame membrane, and a second frame membrane. The first frame membrane, the first catalyst layer, the proton exchange membrane, the second catalyst layer, and the second frame membrane are stacked in sequence. The five-in-one membrane electrode comprises a first surface and a second surface opposite to the first surface.

[0152] (2) Place the five-in-one membrane electrode on the hot pressing tooling.

[0153] (3) Use a cutting machine to cut the first positioning frame gasket, and place the cut first positioning frame gasket on the first surface, and align the positioning holes on the first positioning frame gasket with the positioning pins of the hot pressing tooling, and fix them. The cut first positioning frame gasket has a first inner frame and a first outer frame.

[0154] (4) Provide a first adhesive material, the first adhesive material comprising an ultra-thin double-sided adhesive with a PET core inside and a first release film and a second release film respectively located on two opposite surfaces of the ultra-thin double-sided adhesive, wherein the thickness of the ultra-thin double-sided adhesive is 5 μm.

[0155] (5) Cut the first release film and the ultra-thin double-sided adhesive tape along the direction from the first release film to the second release film to form an incision, and then remove the first release film on one side of the incision to expose a portion of the ultra-thin double-sided adhesive tape, and set the exposed ultra-thin double-sided adhesive tape as the first adhesive layer portion, and the remaining ultra-thin double-sided adhesive tape as the second adhesive layer portion. The width of the ultra-thin double-sided adhesive tape in the bonding area after cutting is 1.2 mm.

[0156] (6) removing the remaining first release film, placing the ultra-thin double-sided adhesive tape and the second release film in the first inner frame of the cut first positioning frame gasket, and making the first adhesive layer adhere to the first frame film.

[0157] (7) Remove the second release film and the second adhesive layer.

[0158] (8) A first gas diffusion layer having the same size as the first inner frame of the cut first positioning frame gasket is placed in the first inner frame of the first positioning frame gasket through a positioning device, and the first gas diffusion layer is bonded to the first adhesive layer.

[0159] (9) Remove the first positioning frame gasket.

[0160] (10) Use a cutting machine to cut the second positioning frame gasket, and place the cut second positioning frame gasket on the second surface, and align the positioning holes on the second positioning frame gasket with the positioning pins of the hot pressing tooling, and fix them. The cut second positioning frame gasket has a second inner frame and a second outer frame.

[0161] (11) Provide a second adhesive material. The second adhesive material includes an ultra-thin double-sided adhesive with a PET core inside and a third release film and a fourth release film respectively located on two opposite surfaces of the ultra-thin double-sided adhesive. The thickness of the ultra-thin double-sided adhesive is 5 μm.

[0162] (12) Cut the fourth release film and the ultra-thin double-sided adhesive tape along the direction from the third release film to the fourth release film to form an incision, and then remove the third release film on one side of the incision to expose a portion of the ultra-thin double-sided adhesive tape, and set the exposed ultra-thin double-sided adhesive tape as the third adhesive layer portion, and the remaining ultra-thin double-sided adhesive tape as the fourth adhesive layer portion. The width of the ultra-thin double-sided adhesive tape in the bonding area after cutting is 1.2 mm.

[0163] (13) Remove the remaining third release film, and place the ultra-thin double-sided adhesive tape and the fourth release film in the second inner frame of the cut second positioning frame gasket, and make the second adhesive layer adhere to the second frame film.

[0164] (14) Remove the fourth release film and the fourth adhesive layer.

[0165] (15) A second gas diffusion layer having the same size as the second inner frame of the cut second positioning frame gasket is placed in the second inner frame of the second positioning frame gasket through a positioning device, and the second gas diffusion layer is bonded to the third adhesive layer.

[0166] (16) Remove the second positioning frame gasket to obtain a seven-in-one membrane electrode.

[0167] Example 2

[0168] (1) A five-in-one membrane electrode is provided, wherein the five-in-one membrane electrode comprises a proton exchange membrane, a first catalyst layer, a second catalyst layer, a first frame membrane, and a second frame membrane. The first frame membrane, the first catalyst layer, the proton exchange membrane, the second catalyst layer, and the second frame membrane are stacked in sequence. The five-in-one membrane electrode comprises a first surface and a second surface opposite to the first surface.

[0169] (2) Place the five-in-one membrane electrode on the hot pressing tooling.

[0170] (3) Use a cutting machine to cut the first positioning frame gasket, and place the cut first positioning frame gasket on the first surface, and align the positioning holes on the first positioning frame gasket with the positioning pins of the hot pressing tooling, and fix them. The cut first positioning frame gasket has a first inner frame and a first outer frame.

[0171] (4) Providing a first adhesive material, the first adhesive material comprising a PES hot melt adhesive film and a first release film and a second release film respectively located on two opposite surfaces of the PES hot melt adhesive film, wherein the thickness of the PES hot melt adhesive film is 20 μm.

[0172] (5) Cut the first release film and the PES hot melt adhesive film along the direction from the first release film to the second release film to form an incision, then remove the first release film on one side of the incision to expose a portion of the PES hot melt adhesive film, and set the exposed PES hot melt adhesive film as the first adhesive layer portion, and the remaining PES hot melt adhesive film as the second adhesive layer portion. The width of the PES hot melt adhesive film in the bonding area after cutting is 1.2 mm.

[0173] (6) Remove the remaining first release film, and place the PES hot melt adhesive film and the second release film in the first inner frame of the cut first positioning frame gasket, and make the first adhesive layer adhere to the first frame film.

[0174] (7) Use a cutting machine to cut the second positioning frame gasket, and place the cut second positioning frame gasket on the second surface, and align the positioning holes on the second positioning frame gasket with the positioning pins of the hot pressing tooling, and fix them. The cut second positioning frame gasket has a second inner frame and a second outer frame.

[0175] (8) Providing a second adhesive material, the second adhesive material comprising a PES hot melt adhesive film and a third release film and a fourth release film respectively located on two opposite surfaces of the PES hot melt adhesive film, wherein the thickness of the PES hot melt adhesive film is 20 μm.

[0176] (9) Cut the fourth release film and the PES hot melt adhesive film along the direction from the third release film to the fourth release film to form an incision, then remove the third release film on one side of the incision to expose a portion of the PES hot melt adhesive film, and set the exposed PES hot melt adhesive film as the third adhesive layer portion, and the remaining PES hot melt adhesive film as the fourth adhesive layer portion. The width of the PES hot melt adhesive film in the bonding area after cutting is 1.2 mm.

[0177] (10) Remove the remaining third release film, and place the PES hot melt adhesive film and the fourth release film in the second inner frame of the cut second positioning frame gasket, and bond the second adhesive layer to the second frame film by hot pressing.

[0178] (11) The second release film, the second adhesive layer, the fourth release film and the fourth adhesive layer are removed.

[0179] (12) A first gas diffusion layer having the same size as the first inner frame of the first positioning frame gasket after cutting is placed in the first inner frame of the first positioning frame gasket through a positioning device, and the first gas diffusion layer is bonded to the first adhesive layer by hot pressing, and a second gas diffusion layer having the same size as the second inner frame of the second positioning frame gasket after cutting is placed in the second inner frame of the second positioning frame gasket through a positioning device, and the second gas diffusion layer is bonded to the third adhesive layer by hot pressing. The hot pressing temperature is 120° C., the hot pressing pressure is 0.3 MPa, and the hot pressing time is 20 seconds.

[0180] (13) Remove the first positioning frame gasket and the second positioning frame gasket to obtain a seven-in-one membrane electrode.

[0181] Example 3

[0182] The preparation method of Example 3 is substantially the same as that of Example 1, except that:

[0183] In step (4) and step (8), the PES hot melt adhesive film is replaced with an epoxy-based thermosetting adhesive film, and the thickness of the epoxy-based thermosetting adhesive film is set to 10 μm.

[0184] In step (12), the hot pressing temperature is 130° C., the hot pressing pressure is 0.35 MPa, and the hot pressing time is 30 seconds.

[0185] Comparative Example 1

[0186] (1) A five-in-one membrane electrode is provided, wherein the five-in-one membrane electrode comprises a proton exchange membrane, a first catalyst layer, a second catalyst layer, a first frame membrane, and a second frame membrane. The first frame membrane, the first catalyst layer, the proton exchange membrane, the second catalyst layer, and the second frame membrane are stacked in sequence. The five-in-one membrane electrode comprises a first surface and a second surface opposite to the first surface.

[0187] (2) Place the five-in-one membrane electrode on the hot pressing tooling.

[0188] (3) Use a cutting machine to cut the first positioning frame gasket, and place the cut first positioning frame gasket on the first surface, and align the positioning holes on the first positioning frame gasket with the positioning pins of the hot pressing tooling, and fix them. The cut first positioning frame gasket has a first inner frame and a first outer frame.

[0189] (4) The first gas diffusion layer having the same size as the first inner frame of the cut first positioning frame gasket is placed in the first inner frame of the first positioning frame gasket through a positioning device.

[0190] (5) Remove the first positioning frame gasket.

[0191] (6) Use a cutting machine to cut the second positioning frame gasket, and place the cut second positioning frame gasket on the second surface, and align the positioning holes on the second positioning frame gasket with the positioning pins of the hot pressing tooling, and fix them. The cut second positioning frame gasket has a second inner frame and a second outer frame.

[0192] (7) The second gas diffusion layer having the same size as the second inner frame of the cut second positioning frame gasket is placed in the second inner frame of the second positioning frame gasket through a positioning device and hot pressed. The hot pressing temperature is 130° C., the hot pressing pressure is 0.35 MPa, and the hot pressing time is 30 seconds.

[0193] (8) Remove the second positioning frame gasket to obtain a seven-in-one membrane electrode.

[0194] Storage environment tests were conducted on multiple seven-in-one membrane electrodes prepared in Examples 1 to 3 and Comparative Example 1 to verify the stability of the glue layer in the seven-in-one membrane electrode at different temperatures and humidities, especially the stability at low temperature and low humidity. The test results are shown in Tables 1 to 16 below.

[0195] The storage environment test is specifically as follows: the prepared seven-in-one membrane electrode is placed in a constant temperature and humidity chamber for 300 hours, and the temperature of the constant temperature and humidity chamber is set to 10°C ~ 40°C, and the humidity of the constant temperature and humidity chamber is set to 30% RH ~ 90% RH, to test the retention of the glue layer when the seven-in-one membrane electrode swells, and whether there is debonding or falling off.

[0196] The different serial numbers in the following Tables 1 to 12 represent the same seven-in-one membrane electrode. For example, serial number 1 in Table 1 represents a seven-in-one membrane electrode prepared in Example 1, serial number 2 in Table 1 represents another seven-in-one membrane electrode prepared in Example 1, serial number 3 in Table 1 represents another seven-in-one membrane electrode prepared in Example 1, and so on.

[0197] Table 1 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 1

[0198] Serial number Temperature(℃) Humidity (%RH) Time (h) Adhesive layer status 1 10 30 300 good 2 10 40 300 good 3 10 50 300 good 4 10 60 300 good 5 10 70 300 good 6 10 80 300 good 7 10 90 300 good

[0199] Table 2 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 1

[0200] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 20 30 300 good 2 20 40 300 good 3 20 50 300 good 4 20 60 300 good 5 20 70 300 good 6 20 80 300 good 7 20 90 300 good

[0201] Table 3 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 1

[0202] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 30 30 300 Glue opening 2 30 40 300 good 3 30 50 300 good 4 30 60 300 good 5 30 70 300 good 6 30 80 300 good 7 30 90 300 good

[0203] Table 4 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 1

[0204]

[0205]

[0206] Table 5 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 2

[0207] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 10 30 300 Glue opening 2 10 40 300 Glue opening 3 10 50 300 Glue opening 4 10 60 300 Glue opening 5 10 70 300 good 6 10 80 300 good 7 10 90 300 good

[0208] Table 6 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 2

[0209] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 20 30 300 Glue opening 2 20 40 300 Glue opening 3 20 50 300 Glue opening 4 20 60 300 good 5 20 70 300 good 6 20 80 300 good 7 20 90 300 good

[0210] Table 7 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 2

[0211] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 30 30 300 Glue opening 2 30 40 300 good 3 30 50 300 good 4 30 60 300 good 5 30 70 300 good 6 30 80 300 good 7 30 90 300 good

[0212] Table 8 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 2

[0213]

[0214]

[0215] Table 9 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 3

[0216] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 10 30 300 Glue opening 2 10 40 300 good 3 10 50 300 good 4 10 60 300 good 5 10 70 300 good 6 10 80 300 good 7 10 90 300 good

[0217] Table 10 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 3

[0218] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 20 30 300 good 2 20 40 300 good 3 20 50 300 good 4 20 60 300 good 5 20 70 300 good 6 20 80 300 good 7 20 90 300 good

[0219] Table 11 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 3

[0220] Serial number Temperature(℃) Humidity (%RH) Time(H) Adhesive layer status 1 30 30 300 good 2 30 40 300 good 3 30 50 300 good 4 30 60 300 good 5 30 70 300 good 6 30 80 300 good 7 30 90 300 good

[0221] Table 12 Temperature and humidity tolerance test results of the glue layer in the seven-in-one membrane electrode prepared in Example 3

[0222]

[0223]

[0224] Table 13 Temperature and humidity tolerance test results of the seven-in-one membrane electrode prepared in comparative example 1

[0225] Serial number Temperature(℃) Humidity (%RH) Time(H) Gas diffusion layer status 1 10 30 300 Separation 2 10 40 300 Separation 3 10 50 300 Separation 4 10 60 300 Separation 5 10 70 300 Separation 6 10 80 300 Separation 7 10 90 300 Partial separation

[0226] Table 14 Temperature and humidity tolerance test results of the seven-in-one membrane electrode prepared in comparative example 1

[0227] Serial number Temperature(℃) Humidity (%RH) Time(H) Gas diffusion layer status 1 20 30 300 Separation 2 20 40 300 Separation 3 20 50 300 Separation 4 20 60 300 Separation 5 20 70 300 Separation 6 20 80 300 Partial separation 7 20 90 300 Partial separation

[0228] Table 15 Temperature and humidity tolerance test results of the seven-in-one membrane electrode prepared in comparative example 1

[0229] Serial number Temperature(℃) Humidity (%RH) Time(H) Gas diffusion layer status 1 30 30 300 Separation 2 30 40 300 Separation 3 30 50 300 Separation 4 30 60 300 Separation 5 30 70 300 Partial separation 6 30 80 300 Partial separation 7 30 90 300 good

[0230] Table 16 Temperature and humidity tolerance test results of the seven-in-one membrane electrode prepared in comparative example 1

[0231] Serial number Temperature(℃) Humidity (%RH) Time(H) Gas diffusion layer status 1 40 30 300 Separation 2 40 40 300 Separation 3 40 50 300 Separation 4 40 60 300 Partial separation 5 40 70 300 Partial separation 6 40 80 300 Partial separation 7 40 90 300 Partial separation

[0232] It can be seen from Tables 1 to 16 that the adhesive layer in the seven-in-one membrane electrode prepared in Examples 1 to 3 has high stability at different temperatures and humidities, while the seven-in-one membrane electrode prepared in Comparative Example 1 does not use an adhesive layer. Although the gas diffusion layer can be briefly adhered to the frame membrane after hot pressing, it is easy to separate and fall off at room temperature, and the samples that are not separated are basically in an environment with a high water molecule content, which increases the storage cost.

[0233] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0234] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A gas diffusion layer fixing process, characterized in that: The following steps are involved: Providing a five-in-one membrane electrode, the five-in-one membrane electrode comprising a first surface and a second surface opposite to the first surface, and placing the five-in-one membrane electrode on a hot pressing tool; Providing a first adhesive material, the first adhesive material comprising a first adhesive layer and a first release film and a second release film respectively located on two opposite surfaces of the first adhesive layer, and cutting the first release film and the first adhesive layer along a direction from the first release film to the second release film to form an incision; Removing the first release film located at one side of the incision to expose a portion of the first adhesive layer, and setting the exposed first adhesive layer as a first adhesive layer portion, and setting the remaining first adhesive layer as a second adhesive layer portion; removing the remaining first release film, and placing the first adhesive layer and the second release film on the first surface, and making the first adhesive layer partially bonded to the first surface; removing the second release film and the second adhesive layer; as well as The first gas diffusion layer is bonded to the first glue layer portion.

2. The gas diffusion layer fixing process according to claim 1, characterized in that: After placing the five-in-one membrane electrode on the hot pressing tool and before placing the first adhesive layer and the second release film on the first surface, the fixing process further includes the following steps: Cutting the first positioning frame gasket so that the first positioning frame gasket after cutting has a first inner frame and a first outer frame; and placing the cut first positioning frame gasket on the first surface; Wherein, the first adhesive layer and the second release film are placed in the first inner frame and on the first surface; After bonding the first gas diffusion layer to the first glue layer portion, the fixing process further comprises the following steps: Remove the first positioning frame gasket.

3. The gas diffusion layer fixing process according to claim 2, characterized in that: The five-in-one membrane electrode comprises a first positioning member, the hot pressing tool comprises a second positioning member, and the first positioning frame gasket comprises a third positioning member; The process of placing the five-in-one membrane electrode on a hot pressing tool specifically includes: Placing the five-in-one membrane electrode on a hot pressing tool by aligning the first positioning member and the second positioning member; Placing the cut first positioning frame gasket on the first surface specifically includes: The cut first positioning frame gasket is placed on the first surface by aligning the third positioning member and the second positioning member.

4. The gas diffusion layer fixing process according to claim 3, characterized in that: The first positioning member is a positioning hole, the second positioning member is a positioning pin, and the third positioning member is a positioning hole.

5. The gas diffusion layer fixing process according to claim 2, characterized in that: Bonding the first gas diffusion layer to the first adhesive layer specifically comprises the following steps: placing the first gas diffusion layer in the first inner frame by a positioning device; and The first gas diffusion layer is bonded to the first glue layer portion.

6. The gas diffusion layer fixing process according to claim 1, characterized in that: The first adhesive layer is a double-sided adhesive, and the adhesion between the first release film and the first adhesive layer is smaller than the adhesion between the second release film and the first adhesive layer.

7. The method for fixing a gas diffusion layer according to any one of claims 1 to 6, characterized in that: The fixing process further comprises the following steps: Providing a second adhesive material, the second adhesive material comprising a second adhesive layer and a third release film and a fourth release film respectively located on two opposite surfaces of the second adhesive layer, and cutting the third release film and the second adhesive layer along a direction from the third release film to the fourth release film to form an incision; Removing the third release film located at one side of the incision to expose a portion of the second adhesive layer, and setting the exposed second adhesive layer as the third adhesive layer portion, and the remaining second adhesive layer as the fourth adhesive layer portion; removing the remaining third release film, and placing the second adhesive layer and the fourth release film on the second surface, and making the fourth adhesive layer partially bonded to the second surface; removing the fourth release film and the fourth adhesive layer portion; and The second gas diffusion layer is bonded to the third glue layer portion.

8. A gas diffusion layer fixing process, characterized in that: The following steps are involved: Providing a five-in-one membrane electrode, the five-in-one membrane electrode comprising a first surface and a second surface opposite to the first surface, and placing the five-in-one membrane electrode on a hot pressing tool; Providing a first adhesive material, the first adhesive material comprising a first adhesive layer and a first release film and a second release film respectively located on two opposite surfaces of the first adhesive layer, and cutting the first release film and the first adhesive layer along a direction from the first release film to the second release film to form an incision; Removing the first release film located at one side of the incision to expose a portion of the first adhesive layer, and setting the exposed first adhesive layer as a first adhesive layer portion, and setting the remaining first adhesive layer as a second adhesive layer portion; removing the remaining first release film, placing the first adhesive layer and the second release film on the first surface, and bonding the first adhesive layer to the first surface by heat pressing; Providing a second adhesive material, the second adhesive material comprising a second adhesive layer and a third release film and a fourth release film respectively located on two opposite surfaces of the second adhesive layer, and cutting the third release film and the second adhesive layer along a direction from the third release film to the fourth release film to form an incision; Removing the third release film located at one side of the incision to expose a portion of the second adhesive layer, and setting the exposed second adhesive layer as the third adhesive layer portion, and the remaining second adhesive layer as the fourth adhesive layer portion; removing the remaining third release film, placing the second adhesive layer and the fourth release film on the second surface, and bonding the fourth adhesive layer to the second surface by heat pressing; removing the second release film, the second adhesive layer portion, the fourth release film and the fourth adhesive layer portion; as well as The first gas diffusion layer is bonded to the first glue layer portion by heat pressing, and the second gas diffusion layer is bonded to the third glue layer portion by heat pressing.

9. The gas diffusion layer fixing process according to claim 8, characterized in that: The fixing process includes at least one of the following (1) to (3): (1) The temperature of the hot pressing is 60° C. to 150° C.; (2) The hot pressing pressure is 0.2 MPa to 1 MPa; (3) The heat pressing time is 10s to 40s.

10. The gas diffusion layer fixing process according to claim 8 or 9, characterized in that: The first adhesive layer is selected from at least one of ethylene-vinyl acetate copolymer hot melt adhesive film, polyamide hot melt adhesive film, polyethylene terephthalate hot melt adhesive film, thermoplastic polyurethane hot melt adhesive film, polyether sulfone hot melt adhesive film and epoxy-based thermosetting adhesive film.

Images