Edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrode

Abstract

The invention relates to an edge sealing jig for continuous hot pressing and cold pressing of a large-size PEM membrane electrode. The edge sealing jig comprises a supporting frame, a guide rail arranged on the supporting frame, a vacuum table in sliding connection with the guide rail, a control cabinet and a vacuum pump, wherein the control cabinet and the vacuum pump are connected with the vacuum table; the stainless steel punched plate, the lower-layer frame film, the CCM structure and the upper-layer frame film are sequentially arranged on the shell top plate from bottom to top; one end of the guide rail is connected with the hot-pressing equipment workbench, the other end of the guide rail is connected with the cold-pressing equipment workbench, the vacuum table slides to the hot-pressing equipment workbench along the guide rail to perform hot-pressing shaping on the lower-layer frame film, the CCM structure and the upper-layer frame film, and then slides to the cold-pressing equipment workbench along the guide rail to perform rapid cold-pressing shaping, so that the edge sealing of the CCM structure is completed. The problems of bubbles, disengagement and the like in the edge sealing process can be avoided, equipment such as a mechanical arm and a crane is not needed, the edge sealing efficiency is improved, the safety of personnel in the operation process is guaranteed, the device can adapt to two edge sealing processes, and the edge sealing effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of PEM membrane electrode preparation, and in particular relates to an edge sealing jig used for continuous hot pressing and cold pressing of large-size PEM membrane electrodes. Background Art

[0002] Hydrogen has a high calorific value, is clean and carbon-free, can store energy, generate electricity, and generate heat. It is flexible and efficient, and has a wide range of application scenarios. Proton exchange membrane (PEM) water electrolysis technology is an efficient method for hydrogen production. It promotes the decomposition of water into hydrogen and oxygen by applying voltage between the anode and the cathode, providing a feasible method for hydrogen production. Membrane electrode (MEA) is the core component of proton exchange membrane water electrolysis. The PEM membrane electrode is mainly composed of cathode and anode catalyst layers, proton exchange membranes, and cathode and anode gas diffusion layers. The anode catalyst slurry and cathode catalyst slurry are directly coated on both sides of the PEM. The three-in-one structure formed after drying is called a CCM (catalyst coated membrane) structure. In order to prevent the edge oxidation of the CCM structure and ensure its sealing performance, the CCM structure needs to be sealed. At the same time, the edge sealing can also protect and support the CCM structure.

[0003] In order to adapt to large-scale industrial production, the industrial process and process route of CCM edge sealing are being gradually improved. However, the existing process path still cannot solve the problems encountered during CCM edge sealing, such as bubbles, detachment, swelling marks, etc., and similar situations are more common and more difficult to avoid in the CCM edge sealing of large-size membrane electrodes. In addition, the existing technology can be applied to the incomplete development of jigs for large-size membrane electrode edge sealing. The edge sealing of membrane electrodes involves a continuous hot pressing and cold pressing process. Most of the current hot pressing and cold pressing processes are discontinuous, and the membrane electrode that has finished hot pressing needs to be transferred to the cold pressing equipment with the help of a robotic arm or other equipment, which is time-consuming and poses a safety hazard. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an edge sealing jig for continuous hot pressing and cold pressing of large-sized PEM membrane electrodes.

[0005] The present invention is specifically implemented through the following technical solutions. According to the present invention, a sealing edge jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes includes a support frame, a guide rail arranged on the support frame, a vacuum table slidably connected to the guide rail, and a control cabinet and a vacuum pump connected to the vacuum table; the vacuum table includes a shell, a top plate of the shell is provided with a plurality of first vacuum holes, a plurality of positioning bolt holes and a plurality of second vacuum holes, a vacuum chamber is provided under the top plate, the first vacuum holes are evenly arranged around the top plate of the shell, the second vacuum hole is arranged in the middle of the top plate of the shell, and the first vacuum hole and the second vacuum hole are both connected to the vacuum chamber; a vacuum valve is provided on the side wall of the shell, and the vacuum valve One end is connected to the vacuum chamber, and the other end is connected to the vacuum pump; a sealing rubber strip is arranged on the top of the vacuum table; a stainless steel punching plate, a lower frame film, a CCM structure, and an upper frame film are arranged on the top plate of the shell in order from bottom to top and are located in the groove formed by the top plate of the shell and the sealing rubber strip; the stainless steel punching plate, the lower frame film, the CCM structure, and the upper frame film are fixed on the top plate of the shell by positioning bolts and do not cover the first vacuum hole; an upper protective layer plate is arranged on the uppermost layer and is located above the sealing rubber strip; the stainless steel punching plate, the lower frame film, the CCM structure, and the upper frame film are sealed in the cavity formed by the upper protective layer plate, the sealing rubber strip, and the top plate of the shell; One end of the guide rail is connected to the workbench of the hot pressing equipment, and the other end is connected to the workbench of the cold pressing equipment. The vacuum table slides along the guide rail to the workbench of the hot pressing equipment to perform a hot pressing process on the lower frame film, the CCM structure and the upper frame film, and then slides along the guide rail to the workbench of the cold pressing equipment to perform rapid cold pressing and shaping on the lower frame film, the CCM structure and the upper frame film, thereby completing the edge sealing of the CCM structure.

[0006] The aforementioned edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes, the upper protective layer plate includes a stainless steel plate, a first protective layer, a second protective layer and a third protective layer, the first protective layer, the second protective layer and the third protective layer are arranged on the stainless steel plate in order from bottom to top, and the size of the first protective layer is slightly larger than the size of the second protective layer, the size of the second protective layer is larger than the size of the third protective layer, and the size of the third protective layer is slightly larger than the size of the CCM structure catalyst layer.

[0007] Further, the thickness of the stainless steel plate of the upper protective layer is 1-4 mm, the first protective layer is a silicone protective layer with a thickness of 0.5-2 mm; the second protective layer is a PET high temperature resistant protective layer with a thickness of 0.05-1.5 mm; the third protective layer is an ultra-thin PEM high temperature resistant protective layer with a thickness of 0.01-0.05 mm. This description is not considered to be a limitation of the present invention.

[0008] Furthermore, the stainless steel perforated plate is evenly distributed with a plurality of small holes, and a uniform vacuum adsorption area can be formed on the surface of the vacuum table through the stainless steel perforated plate. The aperture of the small holes on the stainless steel perforated plate ranges from 0.5 mm to 1.5 mm, and the hole spacing ranges from 5 mm to 20 mm, but this description is not considered to be a limitation of the present invention.

[0009] The aforementioned edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes also includes a lower protective layer plate, which is arranged between the stainless steel punching plate and the lower frame membrane. The lower protective layer plate has the same structure as the upper protective layer plate, and also includes a stainless steel plate, a first protective layer, a second protective layer and a third protective layer; the size of the lower protective layer plate is equal to the size of the stainless steel punching plate, and positioning holes I are also arranged on the stainless steel plate, the first protective layer and the second protective layer of the lower protective layer plate, and the position of the positioning hole I corresponds to the position of the positioning bolt hole.

[0010] Furthermore, positioning holes II corresponding to the positions of the positioning bolt holes are provided on the stainless steel perforated plate, the upper frame membrane, the lower frame membrane and the proton exchange membrane in the CCM structure. After the stainless steel perforated plate, the lower protective layer plate, the lower frame membrane, the CCM structure and the upper frame membrane are arranged on the shell top plate from bottom to top in sequence, the stainless steel perforated plate, the lower protective layer plate, the lower frame membrane, the CCM structure and the upper frame membrane are fixed in position by installing positioning bolts in the positioning holes I, the positioning holes II and the corresponding positioning bolt holes, thereby assisting the CCM structure in edge sealing.

[0011] The aforementioned edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes, multiple positioning bolt holes are arranged along the two diagonals of the shell top plate, and the positioning bolt holes are grouped into 4. The 4 positioning bolt holes in the same group are at the same distance from the center of the vacuum table shell top plate. The positioning bolts are assembled in the corresponding positioning bolt holes to fix the stainless steel punching plate, the lower protective layer plate, the lower frame membrane, the CCM structure, and the upper frame membrane.

[0012] The aforementioned edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes is also provided with a heating tube in the vacuum chamber, a heating wire is provided in the heating tube, the heating wire is connected to the control cabinet, and a switch for controlling the heating of the heating wire is provided on the control cabinet. The heating tube enables the vacuum table to have a heating function.

[0013] The aforementioned edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes, the CCM structure includes a proton exchange membrane and a catalytic layer coated on both sides of the proton exchange membrane, the area of ​​the catalytic layer is smaller than the area of ​​the proton exchange membrane, the middle of the lower frame membrane and the upper frame membrane is hollowed out to avoid the catalytic layer in the CCM structure, and the lower frame membrane and the upper frame membrane are provided with a hot melt adhesive on one side for bonding with the proton exchange membrane for edge sealing with the proton exchange membrane in the CCM structure.

[0014] The aforementioned edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes, the guide rail includes a first guide rail and a second guide rail arranged parallel to each other and fixed on a support frame, the hot pressing equipment workbench is arranged at one end of the first guide rail and the second guide rail and is located between the first guide rail and the second guide rail, and the top surface of the hot pressing equipment workbench is flush with the top surfaces of the first guide rail and the second guide rail; the cold pressing equipment is arranged at the other end of the first guide rail and the second guide rail and is located between the first guide rail and the second guide rail, and the top surface of the cold pressing equipment workbench is flush with the top surfaces of the first guide rail and the second guide rail.

[0015] Furthermore, connecting plates are connected to the bottom of both ends of the first guide rail and the second guide rail, and screw holes are provided on the connecting plates for installing fastening screws. The hot pressing equipment workbench and the cold pressing equipment workbench are fixed to the connecting plates at the bottom of the first guide rail and the second guide rail by fastening screws.

[0016] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technical progress and practicality, and has a wide range of utilization value, and has at least the following advantages: (1) The edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes provided by the present invention has a vacuum table arranged on the guide rail, a vacuum chamber arranged in the vacuum table, and a vacuum hole arranged on the top plate of the vacuum table. Vacuuming is performed before the hot pressing process. Hot pressing and cold pressing are performed in a vacuum environment to avoid bubbles, detachment, swelling marks, etc. during the edge sealing process. A vacuuming mechanism is arranged in the vacuum table, and vacuuming in a small range is faster, which significantly shortens the preparation work before edge sealing. A uniform vacuum adsorption area can be formed on the surface of the vacuum table by a stainless steel perforated plate. In addition, the present invention arranges positioning bolt holes on the top plate of the vacuum table, and the CCM structure, edge sealing materials, and stainless steel perforated plates are placed in the vacuum table and fixed by positioning bolts. The movement of the CCM structure and edge sealing materials can be effectively avoided during the sliding process of the vacuum table between the hot pressing equipment and the cold pressing equipment.

[0017] (2) The present invention places an upper frame film and a lower frame film on both sides of the CCM structure to seal the CCM structure, and at the same time places a lower protective layer plate under the lower frame film, and places an upper protective layer plate on the upper frame film. The upper and lower protective layers are provided with protective layers to protect the CCM structure and the frame films on both sides, so as to avoid damage to the CCM structure caused by the edge sealing operation. At the same time, the upper and lower protective layers use stainless steel plates as substrates, so that the three-in-one structure after edge sealing is smoother, which is conducive to the continuous hot pressing and cold pressing edge sealing process of the CCM structure.

[0018] (3) The two ends of the guide rail of the present invention are respectively connected to the workbench of the hot pressing equipment and the workbench of the cold pressing equipment. A vacuum table is arranged on the guide rail, and the vacuum table is driven by a motor and can slide along the guide rail. Therefore, in the entire edge sealing process, there is no need to transfer the edge sealing materials with the help of mechanical arms, cranes and other equipment, which greatly shortens the time of the edge sealing process, improves the edge sealing efficiency, ensures the safety of personnel during the operation, and reduces the technical level requirements of the production enterprises for the membrane electrode packaging workers.

[0019] (4) The edge sealing jig of the present invention can adapt to two edge sealing processes. When the CCM structure is thin, a lower protective layer plate can be placed between the stainless steel perforated plate and the lower frame film, and a vacuum adsorption area is formed by using the first vacuum hole on the top plate of the shell. When the CCM structure is thick, the lower protective layer plate may not be placed, and a uniform vacuum adsorption area is formed by using the first vacuum hole, the second vacuum hole and the stainless steel perforated plate, which can remove the air between the upper and lower frame films and the CCM structure and improve the edge sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the support frame structure.

[0022] Figure 3 It is a schematic diagram of the vacuum table structure.

[0023] Figure 4 It is a schematic diagram of the slide and pulley structure.

[0024] Figure 5 It is a schematic diagram of the stainless steel perforated plate installed in place.

[0025] Figure 6 is a schematic diagram of the CCM structure.

[0026] Figure 7 It is a schematic diagram of the installation of the CCM structure and the lower frame film and the upper frame film.

[0027] Figure 8 It is a schematic diagram of the structure of the upper protective layer plate.

[0028] Fig. 9 It is a schematic diagram of the structure of the lower protective layer board.

[0029] Fig.10 It is a schematic diagram of placing the stainless steel perforated plate, the lower protective layer plate, the lower frame film, the CCM structure, and the upper frame film from bottom to top.

[0030] in: 1- Support frame; 2-Guide rails; 3- Vacuum table; 4-Control cabinet; 5- Vacuum pump; 6-Stainless steel punching plate; 7-lower protective layer board; 8-lower frame film; 9- CCM structure; 10-upper frame film; 11- upper protective layer plate; 12-stainless steel plate; 13- first protective layer; 14- second protective layer; 15- the third protective layer; 16-positioning hole Ⅰ; 17- Motor; 18-connecting plate; 19-Locking bolt; 20-heating wire connection end; 21- positioning hole II; 2.1- First guide rail; 2.2- Second guide rail; 2.3- Third rail; 3.1- Shell; 3.2-First chute; 3.3- Second chute; 3.4- Third chute; 3.5-Pulley; 3.6- Top plate; 3.7-First vacuum hole; 3.8-Positioning bolt hole; 3.9- Second vacuum hole; 3.10- Vacuum valve; 3.11-Induction switch; 3.12-Limiting block; 3.13-Sealing rubber strip; 3.14-Limiting clamp; 9.1-Proton exchange membrane; 9.2- Anode catalyst layer; 9.3- cathode catalyst layer; DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, the edge sealing jig for continuous hot pressing and cold pressing of large-size PEM membrane electrodes of the present invention includes a support frame 1, a guide rail 2 arranged on the support frame, a vacuum table 3 arranged on the guide rail, and a control cabinet 4 and a vacuum pump 5 connected to the vacuum table.

[0033] like Figure 2 As shown, the guide rails at least include a first guide rail 2.1 and a second guide rail 2.2 arranged in parallel with each other. The first guide rail and the second guide rail are respectively arranged at the top of the front and rear sides of the support frame and have the same length.

[0034] In one embodiment, a third guide rail 2.3 is further provided in the middle of the top of the support frame. The third guide rail is located between the first guide rail and the second guide rail and is parallel to the first guide rail and the second guide rail. The length of the third guide rail is equal to or slightly greater than the length of the support frame in the left-right direction, and the length of the first guide rail and the second guide rail is greater than the length of the third guide rail.

[0035] Preferably, the first guide rail, the second guide rail and the third guide rail are detachably connected to the support frame. In one embodiment, the first guide rail, the second guide rail and the third guide rail are all fixed to the top of the support frame by bolts, but this description is not regarded as a limitation of the present invention.

[0036] like Figure 3 and Figure 4 As shown, the vacuum table comprises a shell 3.1, and a first slide groove 3.2, a second slide groove 3.3 and a third slide groove 3.4 are arranged at the bottom of the shell. The third slide groove is arranged in the middle of the bottom of the shell, between the first slide groove and the second slide groove. The first slide groove, the second slide groove and the third slide groove cooperate with the first guide rail, the second guide rail and the third guide rail respectively. A plurality of pulleys 3.5 arranged in parallel are also arranged in the first slide groove, the second slide groove and the third slide groove. The pulleys are fixed in the corresponding slide grooves through connecting shafts, and the axial direction of the connecting shaft is perpendicular to the axial direction of the corresponding slide grooves, as shown in FIG. Figure 4 At least one pulley is connected to the motor 17, and the motor is connected to the control cabinet, and the control cabinet controls the motor to start and drive the pulley to rotate so that the vacuum table can slide on the guide rail.

[0037] like Figure 3 As shown, a plurality of first vacuum holes 3.7, a plurality of positioning bolt holes 3.8 and a plurality of second vacuum holes 3.9 are arranged on the top plate 3.6 of the shell, and a vacuum chamber is arranged under the top plate (the vacuum chamber is not shown in the figure), the first vacuum holes are evenly arranged along the four sides of the shell top plate, the second vacuum hole is arranged in the middle of the shell top plate, and the first vacuum hole and the second vacuum hole are both connected to the vacuum chamber. A vacuum valve 3.10 is arranged on the side wall of the shell, one end of the vacuum valve is connected to the vacuum chamber, and the other end is connected to the vacuum pump 5 through a pipeline. A plurality of positioning bolt holes are arranged equidistantly along the two diagonals of the top plate, and each 4 positioning bolt holes form a group, and the distances from the 4 positioning bolt holes in the same group to the center of the top plate of the vacuum table shell are equal. The positioning bolts 19 are assembled in the corresponding positioning bolt holes to fix CCM structures and edge sealing materials of a certain size. Different groups of positioning bolt holes have different distances from the center of the shell top plate. Therefore, the arrangement of multiple groups of positioning bolt holes can adapt to the edge sealing of CCM structures of different sizes. The positioning bolt holes with appropriate distances can be selected according to the size of the CCM structure to cooperate with the positioning bolts to fix the CCM structure and the edge sealing material.

[0038] In one embodiment, a heating tube is further provided in the vacuum table, the heating tube is arranged in the vacuum chamber and is close to the top plate of the shell, a heating wire is provided in the heating tube, and the heating wire is electrically connected to the control cabinet (such as Figure 1 The heating wire connection end 20 is provided in the control cabinet, and a switch for controlling the heating of the heating wire is provided. The heating tube enables the vacuum table to have a heating function, and the CCM structure and the edge sealing material placed on the vacuum table can be kept at a certain temperature, activating the viscosity of the hot melt adhesive of the upper frame film and the lower frame film bonded to both sides of the CCM structure, and promoting the edge sealing of the upper frame film and the lower frame film with the CCM structure. In one embodiment, the heating temperature range of the vacuum table is 0~180℃, but this description is not regarded as a limitation of the present invention.

[0039] Preferably, a sealing rubber strip 3.13 is arranged around the top of the vacuum table, and the sealing rubber strip is made of high temperature resistant rubber material.

[0040] like Figure 5 As shown, a stainless steel perforated plate 6 is provided on the top plate of the vacuum table, and a plurality of small holes are evenly distributed on the stainless steel perforated plate, and a uniform vacuum adsorption area can be formed on the surface of the vacuum table through the stainless steel perforated plate. In one embodiment, the aperture range of the small holes on the stainless steel perforated plate is 0.5 mm to 1.5 mm, and the hole spacing is 5 mm to 20 mm, but this description is not considered to be a limitation of the present invention.

[0041] like Figure 5As shown, the size of the stainless steel punching plate is smaller than that of the shell top plate. In one embodiment, the stainless steel punching plate is installed on the shell top plate of the vacuum table to cover the second vacuum hole and just expose the first vacuum hole.

[0042] Specifically, when sealing the edges, the stainless steel perforated plate 6, the lower frame film 8, the CCM structure 9, and the upper frame film 10 are arranged in sequence from bottom to top on the shell top plate and are located in the groove formed by the top plate and the sealing rubber strip 3.13. The stainless steel perforated plate 6, the lower frame film 8, the CCM structure 9, and the upper frame film 10 are fixed to the shell top plate by positioning bolts 19 and do not cover the first vacuum hole 3.7; the upper protective layer plate 11 is arranged on the uppermost layer and is located above the sealing rubber strip. The stainless steel perforated plate, the lower frame film, the CCM structure, and the upper frame film are sealed in the cavity formed by the upper protective layer plate, the sealing rubber strip, and the shell top plate.

[0043] like Figure 6 As shown, the CCM structure includes a proton exchange membrane 9.1 and an anode catalyst layer 9.2 and a cathode catalyst layer 9.3 (hereinafter referred to as "catalytic layer") coated on both sides of the proton exchange membrane. The area of ​​the catalyst layer is smaller than the area of ​​the proton exchange membrane. Figure 7 As shown, the lower frame membrane and the upper frame membrane are hollowed out in the middle to avoid the anode catalyst layer and the cathode catalyst layer in the CCM structure, and the lower frame membrane and the upper frame membrane are provided with hot melt adhesive on one side for bonding with the proton exchange membrane in the CCM structure to seal the edges.

[0044] like Figure 8 As shown, the upper protective layer plate 11 includes a stainless steel plate 12, a first protective layer 13, a second protective layer 14 and a third protective layer 15. The first protective layer, the second protective layer and the third protective layer are arranged on the stainless steel plate in order from bottom to top, and the size of the first protective layer is slightly larger than the size of the second protective layer, the size of the second protective layer is larger than the size of the third protective layer, and the size of the third protective layer is slightly larger than the size of the catalyst layer in the CCM structure. The overall size of the upper protective layer plate is slightly larger than the size of the vacuum table, and the upper protective layer plate is arranged on the uppermost layer and is located above the sealing rubber strip to cover the sealing rubber strip.

[0045] In one embodiment, the thickness of the stainless steel plate of the upper protective layer plate is 1~4 mm, the first protective layer of the upper protective layer plate is a silicone protective layer with a thickness of 0.5~2 mm, the second protective layer is a PET high temperature resistant protective layer with a thickness of 0.05~1.5 mm, and the third protective layer is an ultra-thin PEM high temperature resistant protective layer with a thickness of 0.01~0.05 mm. The above is only an embodiment of the present invention and is not to be construed as a limitation of the present invention.

[0046] In one embodiment, a lower protective layer plate 7 is further provided between the stainless steel perforated plate 6 and the lower frame film 8. Fig. 9 and Fig.10 As shown, the lower protective layer plate has the same structure as the upper protective layer plate, and also includes a stainless steel plate, a first protective layer, a second protective layer and a third protective layer. The material, thickness and setting form of the first protective layer, the second protective layer and the third protective layer are the same as those of the upper protective layer plate. The difference is that the size of the lower protective layer plate is the same as that of the stainless steel perforated plate, and positioning holes Ⅰ16 are also provided on the stainless steel plate, the first protective layer and the second protective layer of the lower protective layer plate. The position of positioning hole Ⅰ corresponds to the position of positioning bolt hole 3.8 on the top plate of the vacuum table. Positioning holes Ⅱ 21 corresponding to the positions of positioning holes Ⅰ16 and positioning bolt holes 3.8 are provided on the stainless steel perforated plate, the upper frame membrane, the lower frame membrane and the proton exchange membrane in the CCM structure (such as Fig.10 After the stainless steel perforated plate 6, the lower protective layer plate 7, the lower frame film 8, the CCM structure 9, and the upper frame film 10 are sequentially arranged on the top plate of the shell from bottom to top, the stainless steel perforated plate, the lower protective layer plate, the lower frame film, the CCM structure, and the upper frame film are fixed in position by installing positioning bolts 19 in positioning holes Ⅰ, positioning holes Ⅱ, and corresponding positioning bolt holes 3.8, thereby assisting the CCM structure in edge sealing and preventing the stainless steel perforated plate, the lower protective layer plate, the lower frame film, the CCM structure, and the upper frame film from moving when the vacuum table slides on the guide rail.

[0047] Further, the guide rail is arranged between the hot pressing equipment and the cold pressing equipment, and one end of the first guide rail and the second guide rail are connected to the workbench of the hot pressing equipment, and the other end is connected to the workbench of the cold pressing equipment. Specifically, the workbench of the hot pressing equipment is arranged at one end of the first guide rail and the second guide rail and is located between the first guide rail and the second guide rail, and the top surface of the workbench of the hot pressing equipment is flush with the top surfaces of the first guide rail, the second guide rail and the third guide rail. The workbench of the cold pressing equipment is arranged at the other end of the first guide rail and the second guide rail and is located between the first guide rail and the second guide rail, and the top surface of the workbench of the cold pressing equipment is flush with the top surfaces of the first guide rail, the second guide rail and the third guide rail. Driven by a motor, the vacuum table slides along the first guide rail and the second guide rail to the workbench of the hot pressing equipment for hot pressing and edge sealing. After the hot pressing is completed, the motor drives the vacuum table to slide along the first guide rail and the second guide rail to the workbench of the cold pressing equipment for rapid cold pressing and shaping, thereby completing the edge sealing process of the CCM structure.

[0048] Preferably, in order to maintain the stability of the vacuum table during sliding, the first guide rail and the second guide rail are fixed to the hot pressing equipment workbench and the cold pressing equipment workbench by fastening screws. Figure 1As shown, the bottoms of both ends of the first guide rail and the second guide rail are connected with connecting plates 18, and screw holes are provided on the connecting plates for installing fastening screws. The hot pressing equipment workbench is arranged at one end of the first guide rail and the second guide rail, and is located between the first guide rail and the second guide rail, and is fixed to the connecting plates at the bottom of the first guide rail and the second guide rail by fastening screws. Similarly, the cold pressing equipment workbench is arranged at the other end of the first guide rail and the second guide rail, and is located between the first guide rail and the second guide rail, and is fixed to the connecting plates at the bottom of the first guide rail and the second guide rail by fastening screws.

[0049] In one embodiment, the support frame is designed as a height-adjustable structure, so that the height of the vacuum table is adjustable and can be used in conjunction with different hot pressing equipment and cold pressing equipment, thereby expanding the scope of use of the present invention.

[0050] In one embodiment, if Figure 1 As shown, both ends of the second guide rail are also provided with limit blocks 3.12, and correspondingly, the side wall of the vacuum table is also provided with an induction switch 3.11 and a limit clamp 3.14, the limit clamp is arranged correspondingly to the limit block, and the limit clamp is connected to the induction switch, and the induction switch is connected to the control cabinet. When the vacuum table slides onto the workbench of the hot pressing equipment or the workbench of the cold pressing equipment, the limit clamp touches the limit block and triggers the induction switch, and the induction switch sends a signal to the control cabinet, and the control cabinet controls the motor to stop driving, so that the vacuum table stops moving. This technology is an existing mature technology, and the present invention will not repeat it.

[0051] In one embodiment, in order to reduce the external line layout, a wiring cavity can be arranged on the side wall of the vacuum table, and the connection line between the induction switch and the control cabinet is routed from the wiring cavity of the vacuum table to the motor connection position, and then combined with the connection line between the motor and the control cabinet, and then led to the control cabinet and connected to the control cabinet. This technology is an existing mature technology and will not be described in detail in the present invention.

[0052] The method for performing continuous hot pressing and cold pressing edge sealing of proton exchange membrane electrode CCM using the above jig includes the following steps: (1) Place the stainless steel punching plate on the top plate of the vacuum table shell so that the positioning hole II on the stainless steel punching plate corresponds to the positioning bolt hole on the top plate of the shell.

[0053] (2) Cut out corresponding positioning holes II on the lower frame film, CCM structure and upper frame film, tear off the protective films of the hot melt adhesive layer of the upper frame film and the lower frame film, and respectively bond them to the two sides of the CCM structure. During the bonding process, make the positioning holes II of the lower frame film, CCM structure and upper frame film correspond to each other and ensure that the CCM structure is flat and wrinkle-free. After bonding, place it on the stainless steel punching plate so that the lower frame film contacts the stainless steel punching plate and ensure that the positioning holes II on the lower frame film correspond to the positioning holes II on the stainless steel punching plate. Install positioning bolts in the positioning holes II and the corresponding positioning bolt holes, and fix the aligned and bonded upper frame film, CCM structure, lower frame film and stainless steel punching plate on the top plate of the vacuum table.

[0054] (3) Cover the upper protective layer plate on the sealing rubber strip, with the side of the upper protective layer plate provided with the first protective layer, the second protective layer and the third protective layer facing downward, so that the third protective layer on the upper protective layer plate corresponds to the catalytic layer on the upper side of the CCM structure.

[0055] (4) The motor is started by the control cabinet, and the motor drives the vacuum table to slide along the guide rail, and the vacuum table is sent to the workbench of the hot pressing equipment set at one end of the guide rail. The pre-pressing pressure is adjusted to pre-compact the CCM structure on the vacuum table and the upper and lower frame films on both sides thereof. At the same time, the vacuum pump is started to evacuate the groove on the vacuum table where the edge sealing material (the edge sealing material at least includes the lower frame film, the CCM structure and the upper frame film) is installed. The first vacuum hole and the second vacuum hole on the top plate of the vacuum table are both connected to the vacuum chamber. After the vacuum pump is started, the vacuum chamber and the first vacuum hole and the second vacuum hole are used to evacuate the groove of the vacuum table.

[0056] (5) After the vacuuming is completed, the pressure and temperature of the hot pressing equipment are adjusted to perform hot pressing and shaping on the CCM structure and the upper and lower frame films on both sides thereof. This process is completed using existing mature technology and will not be described in detail in the present invention.

[0057] (6) After the hot pressing is completed, the vacuum pump is turned off, and the motor is controlled to move in the reverse direction through the control cabinet to drive the vacuum table to slide in the reverse direction along the guide rail, and the vacuum table is sent to the cold pressing equipment workbench arranged at the other end of the guide rail to quickly cold press the CCM structure after hot pressing and the upper and lower frame films on both sides thereof. This process is also completed using existing mature technology and will not be described in detail in the present invention.

[0058] (7) After the cold pressing is completed, the motor is controlled by the control cabinet to withdraw the vacuum table from the cold pressing equipment, the upper protective layer is opened, the positioning bolts are removed, and the CCM structure that has been completed with the first edge sealing is taken out and turned over, that is, the original upper frame film is turned to the lower side to directly contact the stainless steel punching plate, and then the positioning bolts are used to position and fix it again, and the upper protective layer is placed. Steps (3) to (6) are repeated to perform the secondary edge sealing process.

[0059] (8) After the two edge bandings are completed, the motor is controlled by the control cabinet to withdraw the vacuum table from the cold pressing equipment, open the upper protective layer, remove the positioning bolts, take out the CCM structure that has completed the two edge bandings, and bag it in time for storage.

[0060] In the above process, the CCM structure is relatively thick, and the lower frame film can be directly placed on the stainless steel punching plate, and the CCM structure and the upper and lower frame films on both sides are adsorbed on the vacuum table by the first vacuum hole and the second vacuum hole, and then hot pressing and cold pressing are performed. When the CCM structure is relatively thin, for example, when the thickness is less than 0.1 mm, it is necessary to place a lower protective layer plate between the stainless steel punching plate and the lower frame film, such as Fig.10 As shown, the specific edge banding process includes: (1) Place the stainless steel punching plate and the lower protective layer plate on the top plate of the vacuum table shell in order from bottom to top, so that the positioning hole II on the stainless steel punching plate and the positioning hole I on the lower protective layer plate correspond to the positioning bolt holes on the top plate, and the side of the lower protective layer plate provided with the first protective layer, the second protective layer and the third protective layer faces upward; control the heating wire heating through the control cabinet to preheat the lower protective layer plate to a certain temperature (0~180℃).

[0061] (2) Cut out corresponding positioning holes II on the lower frame film, CCM structure and upper frame film, tear off the protective films of the hot melt adhesive layer of the lower frame film and the upper frame film, and respectively bond them to the two sides of the CCM structure. During the bonding process, make the positioning holes II of the lower frame film, CCM structure and upper frame film correspond to each other and ensure that the CCM structure is flat and wrinkle-free. After bonding, place it on the preheated lower protective layer plate and make the lower frame film contact with the lower protective layer plate, so that the catalytic layer on the lower side of the CCM structure corresponds to the third protective layer on the lower protective layer plate, and at the same time ensure that the positioning holes II on the lower frame film correspond to the positioning holes I on the lower protective layer plate, install positioning bolts in the positioning holes II, the corresponding positioning holes I and the corresponding positioning bolt holes, and fix the aligned and bonded upper frame film, CCM structure, lower frame film and lower protective layer plate and stainless steel punching plate on the top plate of the vacuum table.

[0062] Steps (3) to (6) are the same as steps (3) to (6) of the above thicker CCM structure edge sealing process, except that during vacuuming in step (4), the vacuum table groove is evacuated through the vacuum chamber and the first vacuum hole, and after hot pressing and shaping in step (6), the vacuum pump is turned off, and the heating function of the vacuum table heating wire is turned off, and then the cold pressing process is performed.

[0063] (7) After the cold pressing is completed, the control cabinet controls the motor to drive the vacuum table to withdraw from the cold pressing equipment, open the upper protective layer, remove the positioning bolts, take out the edge-sealed CCM structure and bag it for storage in time.

[0064] In one embodiment, the size of the membrane electrode is 750×750 mm, and the diameters of the positioning holes I, II and the positioning bolt holes are 10 mm. In other embodiments, the size of the membrane electrode may also be smaller than 750×750 mm, and the above description is not considered to be a limitation of the present invention.

[0065] The above is only an embodiment of the present invention, and does not limit the present invention in any form. The present invention can also have other forms of embodiments according to the above structures and functions, which are not listed one by one. Therefore, any simple modification, equivalent change and modification made by any technician familiar with the profession to the above embodiment according to the technical essence of the present invention without departing from the scope of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A sealing fixture for continuous hot and cold pressing of large-size PEM membrane electrodes, characterized in that The invention comprises a support frame (1), a guide rail (2) arranged on the support frame, a vacuum table (3) slidably connected to the guide rail, and a control cabinet (4) and a vacuum pump (5) connected to the vacuum table; the vacuum table comprises a shell (3.1), a top plate (3.6) of the shell is provided with a plurality of first vacuum holes (3.7), a plurality of positioning bolt holes (3.8) and a plurality of second vacuum holes (3.9), a vacuum chamber is arranged under the top plate, the first vacuum holes are evenly arranged along the four sides of the top plate of the shell, the second vacuum holes are arranged in the middle of the top plate of the shell, and the first vacuum holes and the second vacuum holes are both connected to the vacuum chamber; a vacuum valve (3.10) is arranged on the side wall of the shell, one end of the vacuum valve is connected to the vacuum chamber, and the other end is connected to the vacuum pump ( 5) connection; a sealing rubber strip (3.13) is arranged around the top of the vacuum table; a stainless steel punching plate (6), a lower frame film (8), a CCM structure (9), and an upper frame film (10) are arranged on the top plate of the shell in order from bottom to top and are located in a groove formed by the top plate of the shell (3.6) and the sealing rubber strip (3.13); the stainless steel punching plate, the lower frame film, the CCM structure, and the upper frame film are fixed to the top plate of the shell by positioning bolts and do not cover the first vacuum hole; an upper protective layer plate (11) is arranged at the uppermost layer and is located above the sealing rubber strip; the stainless steel punching plate, the lower frame film, the CCM structure, and the upper frame film are sealed in a cavity formed by the upper protective layer plate, the sealing rubber strip, and the top plate of the shell; One end of the guide rail is connected to the workbench of the hot pressing equipment, and the other end is connected to the workbench of the cold pressing equipment. The vacuum table slides along the guide rail to the workbench of the hot pressing equipment to perform a hot pressing process on the lower frame film, the CCM structure and the upper frame film, and then slides along the guide rail to the workbench of the cold pressing equipment to perform rapid cold pressing and shaping on the lower frame film, the CCM structure and the upper frame film, thereby completing the edge sealing of the CCM structure.

2. The edge sealing fixture for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 1, characterized in that The upper protective layer plate (11) comprises a stainless steel plate (12), a first protective layer (13), a second protective layer (14) and a third protective layer (15), wherein the first protective layer, the second protective layer and the third protective layer are arranged on the stainless steel plate in order from bottom to top, and the size of the first protective layer is slightly larger than the size of the second protective layer, the size of the second protective layer is larger than the size of the third protective layer, and the size of the third protective layer is slightly larger than the size of the CCM structure catalyst layer.

3. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 2, characterized in that The first protective layer (13) is a silicone protective layer, the second protective layer (14) is a PET high temperature resistant protective layer, and the third protective layer (15) is an ultra-thin PEM high temperature resistant protective layer.

4. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to any one of claims 2 or 3, characterized in that It also includes a lower protective layer plate (7), which is arranged between the stainless steel perforated plate (6) and the lower frame film (8), and the lower protective layer plate has the same structure as the upper protective layer plate, and also includes a stainless steel plate, a first protective layer, a second protective layer and a third protective layer; the size of the lower protective layer plate is equal to the size of the stainless steel perforated plate, and positioning holes I (16) are also arranged on the stainless steel plate, the first protective layer and the second protective layer of the lower protective layer plate, and the position of the positioning hole I corresponds to the position of the positioning bolt hole (3.8).

5. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 4, characterized in that Positioning holes II (21) corresponding to the positions of the positioning bolt holes (3.8) are arranged on the stainless steel perforated plate, the upper frame membrane, the lower frame membrane and the proton exchange membrane in the CCM structure. After the stainless steel perforated plate, the lower protective layer plate, the lower frame membrane, the CCM structure and the upper frame membrane are arranged on the shell top plate in sequence from bottom to top, the stainless steel perforated plate, the lower protective layer plate, the lower frame membrane, the CCM structure and the upper frame membrane are fixed in position by installing positioning bolts in the positioning holes I, the positioning holes II and the corresponding positioning bolt holes, thereby assisting the CCM structure in edge sealing.

6. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 1, characterized in that A plurality of positioning bolt holes (3.8) are arranged along two diagonal lines of the shell top plate, with four positioning bolt holes forming a group, and the four positioning bolt holes in the same group are at the same distance from the center of the vacuum table shell top plate.

7. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 1, characterized in that A heating tube is also arranged in the vacuum chamber, a heating wire is arranged in the heating tube, and the heating wire is connected to the control cabinet.

8. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 1, characterized in that The CCM structure includes a proton exchange membrane and a catalytic layer coated on both sides of the proton exchange membrane. The area of ​​the catalytic layer is smaller than the area of ​​the proton exchange membrane. The middle of the lower frame membrane and the upper frame membrane is hollowed out to avoid the catalytic layer in the CCM structure. The lower frame membrane and the upper frame membrane are provided with a hot melt adhesive on one side for bonding with the proton exchange membrane in the CCM structure to seal the edge.

9. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 1, characterized in that The guide rails comprise a first guide rail (2.1) and a second guide rail (2.2) which are arranged parallel to each other and fixed on a support frame; a hot pressing equipment workbench is arranged at one end of the first guide rail and the second guide rail and is located between the first guide rail and the second guide rail, and a top surface of the hot pressing equipment workbench is flush with the top surfaces of the first guide rail and the second guide rail; a cold pressing equipment is arranged at the other end of the first guide rail and the second guide rail and is located between the first guide rail and the second guide rail, and a top surface of the cold pressing equipment workbench is flush with the top surfaces of the first guide rail and the second guide rail.

10. The edge sealing jig for continuous hot and cold pressing of large-size PEM membrane electrodes according to claim 9, characterized in that The bottom of both ends of the first guide rail and the second guide rail are connected with connecting plates, and screw holes are provided on the connecting plates for installing fastening screws. The hot pressing equipment workbench and the cold pressing equipment workbench are fixed to the connecting plates at the bottom of the first guide rail and the second guide rail by fastening screws.

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