Preparation method suitable for fuel cell membrane electrode

Abstract

The invention discloses a preparation method of a membrane electrode suitable for a fuel cell, which comprises the following steps: laminating a prepared proton exchange membrane and an auxiliary frame material, carrying out cathode spraying and anode spraying, and carrying out a protective membrane half-cutting process of a substrate in a preset range at the periphery of a middle area of the proton exchange membrane in the preparation process to obtain the membrane electrode. And finally, preparing the CCM with the frame. According to the invention, the phenomena of swelling and wrinkling of the proton exchange membrane during spraying can be avoided, tight attachment of the proton exchange membrane and the frame is ensured, and the air tightness of attachment of the proton exchange membrane and the frame is improved, so that the production quality and production efficiency of the membrane electrode are improved; according to the method, the five-in-one integration (the CCM is attached to the frame) of the membrane electrode is completed, and the following problem can be solved: when the manufactured CCM with the frame has the air tightness problem, the air tightness problem caused by air leakage at the joint of the frame and the CCM can be eliminated, so that the air leakage phenomenon of the raw material proton exchange membrane is confirmed, and the air leakage detection efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of fuel cells, in particular to a method for preparing a fuel cell membrane electrode. Background Art

[0002] A fuel cell is a chemical device that directly converts the chemical energy of a fuel into electrical energy, also known as an electrochemical generator.

[0003] As the core component of fuel cells, membrane electrode is composed of proton exchange membrane, catalyst layer, frame and diffusion layer. The preparation process of membrane electrode includes frame preparation and catalyst coating.

[0004] The traditional spraying method is to spray directly on the proton exchange membrane. When spraying the cathode, the anode has a protective film that can support the proton exchange membrane of the cathode to prevent swelling. After spraying the cathode, the protective film on the anode is torn off before spraying the anode. However, when spraying the anode, the proton exchange membrane will produce thermal expansion at high temperature, which will lead to deviation of the effective area or waste of slurry. When the frame is fitted, the fine creases caused by thermal expansion will run through the sealing area of ​​the frame, and the surface of the proton exchange membrane is sprayed with a catalyst, which causes the surface adhesion of the proton exchange membrane to be significantly reduced. When the frame is fitted, the frame and CCM will not be firmly adhered, which reduces the airtightness between the CCM and the frame. Therefore, it is necessary to find a corresponding solution and method. Summary of the invention

[0005] In view of this, it is necessary to overcome at least one of the above-mentioned defects in the prior art. The present invention provides a method for preparing a membrane electrode for a fuel cell, comprising: S1, cutting the proton exchange membrane into a predetermined shape and die-cutting the auxiliary frame material into a predetermined size; S2, placing the prepared proton exchange membrane on a cold laminating device for laminating, so that the edge of the side of the proton exchange membrane without the protective membrane is laminated with the prepared auxiliary frame; placing the proton membrane in the fixed square frame of the upper suction cup and the auxiliary frame on the lower suction cup, so that the edge of the side of the proton exchange membrane without the protective membrane is laminated with the prepared auxiliary frame, the glue used in the cold laminating device is a high temperature resistant pressure-sensitive adhesive, and during the laminating process, the roller pressure of the laminating machine is 0.6Mpa; since the surface of the proton exchange membrane itself is smooth and flat, the bonding effect with the auxiliary frame will be very close and firm; S3, fixing the bonded proton exchange membrane on a first fixture; S4, performing cathode spraying operation on the side of the proton exchange membrane without the protective membrane on the first fixture; since the two sides of the proton exchange membrane are supported by the protective membrane and the auxiliary frame respectively, the proton exchange membrane is effectively prevented from swelling and wrinkling; S5, removing the proton exchange membrane after the cathode spraying operation on the first fixture, and removing the protective film on the other side of the proton exchange membrane; S6, fixing the proton exchange membrane after bonding in S5 on a second fixture; S8, performing an anode spraying operation on the other surface of the proton exchange membrane on the second fixture; Since the proton exchange membrane is supported by an auxiliary frame, it can effectively prevent swelling and wrinkling of the proton exchange membrane. In order to ensure production efficiency, three sets of fixtures are prepared, dozens of proton exchange membranes required for production are bonded to the auxiliary frame in advance, and then cathode spraying and anode spraying are carried out in turn. The three fixtures can be rotated to ensure production efficiency. S9, removing the proton exchange membrane after the anode spraying operation on the second fixture to obtain a CCM with a frame.

[0006] According to the prior art described in the background technology of this patent, when the frames are bonded, the fine creases caused by thermal expansion will penetrate the sealing area of ​​the frame, and the surface of the proton exchange membrane is sprayed with a catalyst, which causes the surface adhesion of the proton exchange membrane to be significantly reduced. When the frames are bonded, the frame and the CCM will not be firmly adhered, which reduces the airtightness between the CCM and the frame. The preparation method for fuel cell membrane electrode disclosed in the present invention adopts a three-layer frame structure of an auxiliary frame (an upper frame, a thin adhesive layer in the middle for bonding the proton exchange membrane, and a lower frame, wherein the upper frame is cut with a half-cut groove of 3-7mm) to bond the adhesive layer in the two-layer structure of the proton exchange membrane, wherein the other layer has a protective membrane One side is higher than the upper surface of the upper frame, the lower surface of the proton exchange membrane is in contact with the adhesive layer, and the upper surface is lower than the upper surface of the upper frame. The technical solution of this case can avoid swelling and wrinkling of the proton exchange membrane during spraying, ensure that the proton exchange membrane and the frame are in close contact, and improve the airtightness of the contact between the two, thereby improving the production quality and production efficiency of the membrane electrode; this method completes the five-in-one integration of the membrane electrode (CCM and the frame are in contact), and can also solve the following problems: when the CCM with a frame has an airtightness problem, the airtightness problem caused by leakage at the junction of the frame and the CCM can be ruled out, thereby confirming that the raw material proton exchange membrane itself has a leakage phenomenon, which greatly improves the efficiency of leakage detection.

[0007] Furthermore, between step S1 and step S2, the middle area is cut into a predetermined hollow structure.

[0008] Furthermore, step S2 also includes using a half-cut process to leave a 3-7 mm half-cut groove around the hollow structure.

[0009] Optionally, the 3-7mm half-cut groove is a half-cut groove with a width of 3mm or 5mm7mm.

[0010] Furthermore, the proton exchange membrane is bonded to the auxiliary frame by the cold bonding device, and the roller pressure of the cold bonding device is 0.6 MPa.

[0011] Furthermore, the cold laminating equipment is a roller film laminating machine.

[0012] Furthermore, the auxiliary frame material is a high temperature resistant material, and the glue used in the cold pasting device is a high temperature resistant pressure sensitive adhesive.

[0013] Furthermore, the high temperature resistant material is PI, and the high temperature resistant pressure-sensitive adhesive is silica gel or 3M glue.

[0014] Furthermore, the proton membrane is fixed by a laminating machine.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a schematic diagram of the present invention; Figure 2 is a schematic cross-sectional view of the present invention; 1 middle area, 2 half-cut groove, 31 upper frame, 32 adhesive layer, 33 lower frame, 41 proton exchange membrane, 42 protective film; The overlapping portion of the proton exchange membrane 41 and the adhesive layer 32 is the location of the half-cut groove, and the two may be of the same size or different in size. A half-cut groove of 3-7 mm is formed between the proton exchange membrane 41 and the adhesive layer 32 . Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0018] In the description of the present invention, it is necessary to understand that the terms "front", "rear", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] The following will describe the preparation method of the membrane electrode for fuel cells of the present invention with reference to the accompanying drawings, wherein Figure 1 It is a schematic diagram of the present invention.

[0020] like Figure 1 As shown, according to an embodiment of the method for preparing a fuel cell membrane electrode according to the present invention, S1, cutting a proton exchange membrane into a predetermined shape, and die-cutting an auxiliary frame material into a predetermined size; S2, placing the prepared proton exchange membrane on a cold laminating device for laminating, so that the edge of the side of the proton exchange membrane without the protective membrane is laminated with the prepared auxiliary frame; placing the proton membrane in the fixed square frame of the upper suction cup and the auxiliary frame on the lower suction cup, so that the edge of the side of the proton exchange membrane without the protective membrane is laminated with the prepared auxiliary frame, the glue used in the cold laminating device is a high temperature resistant pressure-sensitive adhesive, and during the laminating process, the roller pressure of the laminating machine is 0.6Mpa; since the surface of the proton exchange membrane itself is smooth and flat, the bonding effect with the auxiliary frame will be very close and firm; S3, fixing the bonded proton exchange membrane on a first fixture; S4, performing cathode spraying operation on the side of the proton exchange membrane without the protective membrane on the first fixture; since the two sides of the proton exchange membrane are supported by the protective membrane and the auxiliary frame respectively, the proton exchange membrane is effectively prevented from swelling and wrinkling; S5, removing the proton exchange membrane after the cathode spraying operation on the first fixture, and removing the protective film on the other side of the proton exchange membrane; S6, fixing the proton exchange membrane after bonding in S5 on a second fixture; S8, performing an anode spraying operation on the other surface of the proton exchange membrane on the second fixture; Since the proton exchange membrane is supported by an auxiliary frame, it can effectively prevent swelling and wrinkling of the proton exchange membrane. In order to ensure production efficiency, three sets of fixtures are prepared, dozens of proton exchange membranes required for production are bonded to the auxiliary frame in advance, and then cathode spraying and anode spraying are carried out in turn. The three fixtures can be rotated to ensure production efficiency. S9, removing the proton exchange membrane after the anode spraying operation on the second fixture to obtain a CCM with a frame.

[0021] According to some embodiments of the present invention, between step S1 and step S2, the middle area is further cut into a predetermined hollow structure.

[0022] Furthermore, step S2 also includes using a half-cut process to leave a 3-7 mm half-cut groove around the hollow structure.

[0023] Optionally, the 3-7mm half-cut groove is a half-cut groove with a width of 3mm or 5mm7mm.

[0024] According to an embodiment of the present invention, the proton exchange membrane is bonded to the auxiliary frame by the cold bonding device, and the roller pressure of the cold bonding device is 0.6 MPa.

[0025] Furthermore, the cold laminating equipment is a roller film laminating machine.

[0026] According to some embodiments of the present invention, the auxiliary frame material is a high temperature resistant material, and the glue used in the cold pasting device is a high temperature resistant pressure sensitive adhesive.

[0027] Furthermore, the high temperature resistant material is PI, and the high temperature resistant pressure-sensitive adhesive is silica gel or 3M glue.

[0028] According to some embodiments of the present invention, the proton membrane is fixed by a laminating machine.

[0029] Any reference to "one embodiment," "an embodiment," "an illustrative embodiment," etc., means that a specific component, structure, or feature described in connection with the embodiment is included in at least one embodiment of the present invention. Such illustrative expressions throughout this specification do not necessarily refer to the same embodiment. Moreover, when a specific component, structure, or feature is described in connection with any embodiment, it is claimed that it is within the scope of those skilled in the art to implement such component, structure, or feature in connection with other embodiments.

[0030] Although specific embodiments of the present invention have been described in detail with reference to a number of illustrative embodiments of the present invention, it must be understood that a variety of other modifications and embodiments may be devised by those skilled in the art that will fall within the spirit and scope of the principles of the present invention. Specifically, within the scope of the foregoing disclosure, drawings, and claims, reasonable variations and improvements may be made in the arrangement of parts, modules, and / or their subordinate combination layouts without departing from the spirit of the present invention. Except for variations and improvements in parts, modules, and / or layouts, the scope thereof is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a membrane electrode for a fuel cell, It is characterized in that The following steps are involved: S1, cutting the proton exchange membrane into a predetermined shape and die-cutting the auxiliary frame material into a predetermined size; S2, placing the prepared proton exchange membrane on a cold laminating device for laminating, so that the edge of a side of the proton exchange membrane without a protective membrane is laminated with the prepared auxiliary frame; S3, fixing the bonded proton exchange membrane on a first fixture; S4, performing a cathode spraying operation on the side of the proton exchange membrane without a protective membrane on the first fixture; S5, removing the proton exchange membrane after the cathode spraying operation on the first fixture, and removing the protective film on the other side of the proton exchange membrane; S6, fixing the proton exchange membrane after bonding in S5 on a second fixture; S8, performing an anode spraying operation on the other surface of the proton exchange membrane on the second fixture; S9, removing the proton exchange membrane after the anode spraying operation on the second fixture to obtain a CCM with a frame.

2. The method for preparing a membrane electrode for a fuel cell according to claim 1, It is characterized in that Between step S1 and step S2, the middle area is also cut into a predetermined hollow structure.

3. The method for preparing a membrane electrode for a fuel cell according to claim 2, It is characterized in that Step S2 also includes using a half-cut process to leave a 3-7 mm half-cut groove around the hollow structure.

4. The method for preparing a membrane electrode for a fuel cell according to claim 3, It is characterized in that The 3-7mm half-cut groove is a half-cut groove with a width of 3mm or 5mm7mm.

5. The method for preparing a membrane electrode for a fuel cell according to claim 1, It is characterized in that The proton exchange membrane is bonded to the auxiliary frame by the cold bonding device, and the roller pressure of the cold bonding device is 0.6 MPa.

6. The method for preparing a membrane electrode for a fuel cell according to claim 5, It is characterized in that The cold laminating equipment is a roller film laminating machine.

7. A method for preparing a membrane electrode for a fuel cell according to claim 1, It is characterized in that The auxiliary frame material is a high temperature resistant material, and the glue used in the cold pasting device is a high temperature resistant pressure sensitive adhesive.

8. A method for preparing a membrane electrode for a fuel cell according to claim 1, It is characterized in that The high temperature resistant material is PI, and the high temperature resistant pressure sensitive adhesive is silica gel and 3M glue.

9. A method for preparing a membrane electrode for a fuel cell according to claim 1, It is characterized in that The proton membrane is fixed by a laminating machine.

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