PEM electrolytic water membrane electrode with sealing structure

Abstract

The utility model belongs to the field of hydrogen energy electrolysis polar plates, and particularly relates to a PEM electrolysis water membrane electrode with a sealing structure. The electrode comprises a proton exchange membrane, an anode plate and a cathode plate, holes / openings are formed in the edge of the proton exchange membrane; a catalyst layer is arranged in the center of the proton exchange membrane; and the gas diffusion layer is arranged on the edge of the catalyst layer. According to the utility model, the sealing rubber line is formed on the proton exchange membrane, so that the problem that the sealing rubber line is not firmly bonded with the hard frame is solved, and the problems that the cathode and anode rubber lines are easy to misplace, deviate and fall off are solved by punching the proton exchange membrane and integrally injecting and forming the cathode and anode rubber lines.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydrogen energy electrolytic electrode field, concretely relates to a PEM electrolytic water membrane electrode with sealing structure. BACKGROUND

[0002] Hydrogen energy is a clean, efficient, pollution-free and widely used energy, and is regarded as the best energy carrier in the future. At present, there are many ways to produce hydrogen, and the most practical and cleanest way is to produce hydrogen by electrolyzing water. This method only produces hydrogen and oxygen, without other by-products. There are many methods for electrolyzing water, and PEM electrolytic water is currently the most concerned method. PEM electrolytic water mainly produces hydrogen through PEM electrolytic tank. PEM electrolytic tank is mainly composed of electrode plate, sealing assembly and membrane electrode. In the process of operation, the reactant water, product hydrogen and oxygen should not leak to the external environment, and hydrogen and oxygen should not directly contact in the electrolytic tank, so PEM electrolytic tank needs to be strictly sealed.

[0003] At present, the main sealing method of PEM electrolytic tank membrane electrode is to assemble through pressure by hard frame, sealing glue line and proton exchange membrane. The main implementation method is that the sealing glue line is adhered in the sealing groove reserved in the hard frame by dispensing, injection molding and other methods, then the hard frame and membrane electrode are stacked up and down, and after stacking, the designed pressure is used for compression, so that the sealing glue line is compressed to the height with reasonable sealing effect. But this sealing method has obvious disadvantages: 1. The hard frame used at present is mainly high molecular plastic, and the surface free energy of plastic is low, which cannot form good adhesion with common sealing glue, so the glue line is easy to deviate during electrolytic tank assembly, compression and use, which may cause sealing failure; 2. The sealing of electrolytic tank is mainly realized by the close contact of anode and cathode glue lines with proton exchange membrane. Under normal circumstances, the contact position of anode and cathode glue lines with proton exchange membrane is coincident, but the glue line may deviate, so the contact position may be misaligned. The stress of proton exchange membrane will appear at the misaligned position, and the proton exchange membrane may be damaged in the long-term use, which may cause electrolytic tank sealing failure and performance decline. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned defects, the utility model provides a PEM electrolytic water membrane electrode with sealing structure, which solves the defects of the prior art by optimizing the sealing structure.

[0005] The technical scheme of the utility model is as follows.

[0006] The utility model provides a PEM electrolytic water film electrode with novel sealing structure, the PEM electrolytic water film electrode with novel sealing structure includes the sealing rubber line with specific shape, height and width, the proton exchange film with catalytic layer of edge punch, gas diffusion layer,

[0007] The specific shape of the sealing rubber line includes semicircular type, semi-elliptical type, trapezoidal type and square type.

[0008] The specific height of the sealing rubber line ranges from 0.1mm to 1mm.

[0009] The specific width of the sealing rubber line ranges from 0.1mm to 2mm.

[0010] The punch shape of the proton exchange film with catalytic layer includes circular, square and strip shape.

[0011] The punch position of the proton exchange film with catalytic layer is greater than 2mm away from the outermost edge of the proton exchange film and greater than 2mm away from the outermost edge of the catalytic layer.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The sealing rubber line is formed on the proton exchange film to solve the problem of insecure bonding between the sealing rubber line and the hard frame. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structure schematic diagram of semicircular glue type section.

[0015] Figure 2 It is a structure schematic diagram of semi-elliptical glue type section.

[0016] Figure 3 It is a structure schematic diagram of trapezoidal glue type section.

[0017] Figure 4 It is a structure schematic diagram of square glue type section.

[0018] Figure 5 It is a proton exchange film circular punch schematic diagram.

[0019] Figure 6 It is a proton exchange film strip punch schematic diagram.

[0020] Figure 7 It is a position schematic diagram of the sealing rubber line in the proton exchange film.

[0021] The components in the figure are as follows: proton exchange membrane 1, catalytic layer 2, hole / opening 3, sealant line 4, gas diffusion layer 5. DETAILED DESCRIPTION

[0022] In the following description, the technical solutions are described in conjunction with specific drawings so as to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and similar extension embodiments made by those of ordinary skill in the art without creative labor are within the scope of the present application.

[0023] As shown in Figures 5 to 7 A PEM electrolytic water film electrode with a sealing structure includes a proton exchange membrane 1, an anode plate and a cathode plate; the edge of the proton exchange membrane 1 is provided with a hole / opening 3 (hole or opening); the center of the proton exchange membrane 1 is provided with a catalytic layer 2; the edge of the catalytic layer 2 is a gas diffusion layer 5; the proton exchange membrane 1 is integrally injection molded with a sealant line 4; and the anode plate and the cathode plate are respectively formed on both sides of the proton exchange membrane 1.

[0024] As shown in Figures 1 to 4 The shape of the sealant line 4 in the present embodiment can be semicircular, semi-elliptical, trapezoidal or square. Specifically, the height of the sealant line is 0.1-1mm, and the width is 0.1-2mm.

[0025] As shown in Figure 5 Or Figure 6 The shape of the hole / opening includes a circle or a strip. In the present embodiment, the position of the hole / opening is >2mm away from the outermost edge of the proton exchange membrane and >2mm away from the outermost edge of the catalytic layer.

[0026] The current common sealing method of electrolytic cell is mainly through sticking sealing glue lines on the hard frame of electrolytic cell, and then pressing the sealing glue lines on the proton exchange membrane to realize sealing by assembling force. The commonly used hard frame is mostly high polymer plastic material, the surface free energy of which is low, and the sealing glue lines are difficult to be well bonded therewith. In the process of assembling and pressing of electrolytic cell, the glue lines are prone to falling off and deviating, which is not conducive to batch production and cannot guarantee the air tightness of qualified products. The anode and cathode sealing glue lines need to be aligned in height during the pressing process of electrolytic cell, but the alignment accuracy is difficult to be guaranteed due to the following reasons: 1. The sealing glue lines are generally bonded to the hard frame by means of dispensing, injection molding, lamination and the like, but the glue lines of anode and cathode are formed separately, and it is difficult to guarantee the alignment accuracy; 2. The bonding of sealing glue lines and hard frame is not firm, and the deviation phenomenon is prone to occur, which leads to misalignment of anode and cathode glue lines; 3. The upper and lower plates may not be accurately aligned during the assembling process of electrolytic cell, which leads to misalignment of anode and cathode glue lines. Misalignment of anode and cathode glue lines will cause stress on the proton exchange membrane, and long time will lead to damage of the proton exchange membrane, affecting the air tightness and performance of electrolytic cell.

[0027] In order to solve the problem of poor bonding of sealing glue and hard frame, the sealing glue lines are injected onto the proton exchange membrane. In order to solve the problem of stress caused by misalignment of sealing glue, the method of punching holes on the proton exchange membrane and one-time forming of anode and cathode glue lines is adopted, the sealing glue lines are injected onto the proton exchange membrane with catalytic layer, and the gas diffusion layer is combined to form a new type of electrolytic water membrane electrode with integrated sealing structure.

Claims

1. A PEM electrolysis water film electrode with a sealing structure, characterized in that, The application relates to a proton exchange membrane (1), an anode plate and a cathode plate; the edge of the proton exchange membrane (1) is provided with a hole / opening; the center of the proton exchange membrane (1) is provided with a catalytic layer (2); the edge of the catalytic layer (2) is a gas diffusion layer (5); The proton exchange membrane (1) is integrally injection molded with a sealing glue line (4); the anode plate and the cathode plate are respectively formed on the two sides of the proton exchange membrane (1).

2. The PEM electrolytic water film electrode with a sealing structure according to claim 1, characterized in that, The shape of the sealing glue line (4) is a semicircle type, a semi-ellipse type, a trapezoidal type or a square type.

3. The PEM electrolysis water film electrode with a sealing structure according to claim 1, characterized in that, The height of the sealing glue line is 0.1mm-1mm; the width is 0.1-2mm.

4. The PEM electrolytic water film electrode with a sealing structure according to claim 1, characterized in that, The shape of the hole / opening includes a circle, a square or a strip.

5. The PEM electrolytic water film electrode with a sealing structure according to claim 1, characterized in that, The distance between the hole / opening and the outermost edge of the proton exchange membrane is greater than 2mm, and the distance between the hole / opening and the outermost edge of the catalytic layer is greater than 2mm.

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