A method and structure for hot pressing a hydrogen fuel cell membrane electrode

Abstract

The application relates to a hydrogen fuel cell membrane electrode hot pressing method and structure, and the structure comprises an upper pressing plate and a lower pressing plate. A cavity one is formed in the middle of the bottom of the upper pressing plate, the area of the cavity one is consistent with the size of a CCM area, and material one is embedded in the cavity one. High-temperature double-sided adhesive is used to paste material three around the bottom surface of the upper pressing plate, and the material three is pasted in a 'hui' character shape. A cavity two is formed in the middle of the top of the lower pressing plate, material two is embedded in the cavity two, the lower surface of the material two is pasted and reinforced with the bottom of the cavity two by using high-temperature double-sided adhesive, a release film is pasted on the upper surface of the material two by using high-temperature double-sided adhesive, adsorption holes are arranged around or on two sides of the cavity two, the adsorption holes are used for adsorbing and fixing products to prevent the products from sliding and deforming, the inside of the adsorption holes is communicated with a cavity, and the cavity is connected with a vacuum pump outside through a pipeline. The application protects the CCM part of the membrane electrode, improves the pressing effect of the frame, improves the product quality, reduces the load of the hot press, and greatly saves the cost.

Description

[Technical Field]

[0001] This invention belongs to the field of hydrogen fuel cells, specifically a method and structure for hot pressing a membrane electrode assembly (MEA) in a hydrogen fuel cell. [Background Technology]

[0002] The membrane electrode assembly (MEA), or simply membrane electrode, is the core component of the electrochemical reaction in a hydrogen fuel cell. It consists of a proton exchange membrane (CCM) coated with a catalyst, a frame membrane, and a gas diffusion layer. The surface of the frame membrane of the membrane electrode is usually coated with hot melt adhesive. During the manufacturing process, the adhesive surfaces of the cathode and anode frame membranes are bonded together, and then a hot-pressing process is used to melt and solidify the hot melt adhesive, thus bonding the anode and cathode frame membranes together and sealing the CCM.

[0003] In the manufacturing process, the flatbed hot pressing process is an essential step. A conventional hot press consists of two layers of pressure plates, as shown in the attached image. Figure 1 As shown, the flat surface of the pressure plate allows for uniform pressure on the product being pressed. A heating device is installed on the pressure plate to set and control its temperature. The hot-pressing process is one of the longest steps in the entire membrane electrode fabrication process, typically taking 180 seconds, and sometimes up to 240 seconds for some special adhesive types and frame materials. The hot-pressing process serves two main purposes: first, to melt and cure the adhesive layer, improving its stability and durability; and second, to improve the appearance, making the frame smooth and eliminating air bubbles. To achieve these goals, suitable temperature, sufficient pressure, and time must be maintained.

[0004] Based on current usage, traditional hot presses have the following main shortcomings:

[0005] (1) The hot pressing time is too long, usually 3 to 4 minutes, or 180 to 240 seconds, which greatly affects the production efficiency;

[0006] (2) High pressure requirements and large membrane electrode area. In order to provide sufficient pressure, the pressure must be increased, which increases the equipment cost and the volume occupied by the equipment.

[0007] (3) Temperature cannot be controlled in zones. The temperature of the upper and lower plates of the press is evenly distributed. In reality, only the frame membrane around the perimeter needs to be heated. If the temperature of the active zone in the middle is too high, it will be detrimental to the product. Therefore, the temperature setting requirements are quite strict. If the temperature is too high, the proton membrane in the middle CCM will deteriorate or expand and deform. If the temperature is too low, the frame membrane will not achieve the expected effect.

[0008] (4) The CCM area is subjected to pressure for a long time, which will also have an adverse effect on the film material, resulting in undesirable phenomena such as expansion and wrinkles.

[0009] (5) During loading, some materials need to be placed above and below the product to sandwich the product therebetween for protecting the product. In the production process, it is required to stack cushion materials for each product, and after hot pressing, the cushion layers need to be removed to take out the product; in the process of stacking the cushion layers and the product, the requirements for labor are relatively high, meanwhile, the stacking time will affect the production capacity, and the upper and lower cushion layers will affect the temperature rise speed, increase the heating time, and reduce the efficiency;

[0010] (6) The flatness of the press needs to be adjusted regularly. If the surface has an unevenness of more than 0.02mm, the surface needs to be polished and plated, resulting in high maintenance cost and long cycle;

[0011] (7) Due to the high temperature of the press, manual operation has safety risks of burns and crush injuries. [Summary of the Invention]

[0012] The purpose of the present invention is to provide a hot pressing method and structure for a membrane electrode of a hydrogen fuel cell, so as to solve the problems raised in the above background art.

[0013] To achieve the above purpose, a hot pressing method and structure for a membrane electrode of a hydrogen fuel cell is designed, comprising an upper platen 1 and a lower platen 2, a first cavity is opened in the middle of the bottom of the upper platen 1, the area of the first cavity is consistent with the size of the CCM region, a first material 3 is embedded in the first cavity, and the thickness of the first material 3 is 0.1 to 1 mm smaller than the depth of the first cavity; the periphery of the bottom surface of the upper platen 1 is attached with a third material 4 using high-temperature double-sided adhesive, the third material 4 is attached in a "return" shape, the third material 4 is used to quickly conduct the heat of the upper platen 1 to the frame membrane region of the MEA product 5, the outer frame size of the "return"-shaped third material 4 is 1 to 3 mm smaller than the outer edge size of the MEA product 5, and the inner frame size of the "return"-shaped third material 4 is 1 to 2 mm smaller than the CCM region; a second cavity is opened in the middle of the top of the lower platen 2, a second material 6 is embedded in the second cavity, the second material 6 is used to prevent heat loss of the MEA product 5, the lower surface of the second material 6 and the bottom of the second cavity are attached and reinforced by high-temperature double-sided adhesive, the upper surface of the second material 6 is attached with a release film by high-temperature double-sided adhesive, the total thickness of the second material 6, the high-temperature double-sided adhesive and the release film is 0 to 0.5 mm larger than the depth of the second cavity, suction holes 7 are arranged on the periphery or two sides of the second cavity, the suction holes 7 are used to suck and fix the MEA product 5 to prevent the product from sliding and deforming, the interiors of the suction holes 7 are communicated by a cavity, the cavity is connected with an external vacuum pump 8 through a pipeline, the vacuum pump 8 provides negative pressure for the suction holes 7, and the thermal conductivity of the first material 3, the second material 6 and the third material 4 is arranged in the order of thermal conductivity of the first material < thermal conductivity of the second material < thermal conductivity of the third material.

[0014] Furthermore, the depth of cavity one is 5-15mm, and the thickness of material three 4 is 0.1-1mm; the depth of cavity two is 1-10mm, and the perimeter of the planar shape of cavity two is 5-6mm smaller than that of the membrane electrode as a whole, thereby enabling the frame part to bear almost all the pressure, which not only protects the membrane electrode CCM part, but also improves the pressing effect of the frame, while reducing the load on the hot press and greatly saving costs.

[0015] Furthermore, the diameter of the adsorption holes 7 is 0.3 to 1.5 mm, the spacing between the adsorption holes 7 is 2 to 5 mm, the adsorption holes 7 are arranged in a single row or multiple rows, and the distance between the adsorption holes 7 and the edge of the MEA product 5 is 1 to 2 mm, thereby making the adsorption and fixation of the product more effective and further preventing the product from sliding and deforming.

[0016] Furthermore, material 3 is made of breathable material, and materials 6 and 4 are subjected to pressures greater than 5 MPa. This breathable material allows the middle part to play a role in venting during the hot pressing process, and the gas in the edge membrane part can be discharged more quickly, thereby greatly shortening the hot pressing time, improving production efficiency, and improving product quality.

[0017] Furthermore, the Shore hardness range of material 2 6 is 25-78 HA, and the Shore hardness range of material 3 4 is 60-90 HA. This hardness can greatly reduce the flatness requirements of the equipment pressure plate, and also greatly reduce the maintenance cost of the equipment pressure plate surface. Under the condition of no accidental bumps, it can almost achieve lifetime maintenance-free operation.

[0018] Furthermore, material 3 is an aerogel with very low thermal conductivity, material 6 is silicone that meets the hardness requirements, and material 4 is silicone filled with a thermally conductive agent that meets the hardness requirements.

[0019] The present invention also provides a hot-pressing method for a hydrogen fuel cell membrane electrode hot-pressing structure, comprising the following steps:

[0020] 1) Preheat the equipment by turning on the heating function of the upper pressure plate 1 and the lower pressure plate 2. After reaching the set temperature, stabilize for 3 to 5 minutes.

[0021] 2) The upper platen of the hot press rises, opening a certain gap, the size of which is 200-500mm;

[0022] 3) The robotic arm or manual placement of MEA product 5 on the lower pressure plate 2, with MEA product 5 and material 2 6 centered and aligned;

[0023] 4) Start the vacuum pump 8 to adsorb the MEA product 5 onto the lower pressure plate 2 through the adsorption hole 7. The vacuum degree at the adsorption hole 7 is -20 to -85 kPa.

[0024] 5) The upper platen of the hot press descends to press MEA product 5 and maintains the set pressure, which is 1000-6000N, for 20-50 seconds;

[0025] 6) The upper platen of the hot press rises, opening a certain gap two. The size of gap two is the same as the gap in step 2). Vacuum pump 8 stops, and the MEA product is removed by robotic arm or manually.

[0026] 7) Repeat the above process to perform hot pressing of multiple products in sequence.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) This invention innovatively changes the traditional press's simple planar upper and lower pressure plates into a three-dimensional structure. The size of the structure matches the shape of the product, so that the product gets the maximum pressure at the edge position where pressure is needed, and the CCM part that is not needed has almost no pressure.

[0029] (2) This invention innovatively uses three different materials, combined with the three-dimensional structure of the upper and lower pressure plates, so that the temperature of the product is distributed as needed, the temperature of the CCM area is low and the temperature of the edge part is high, which has a good effect on the product.

[0030] (3) The present invention innovatively uses a breathable material, which allows the middle part to play a role in venting during the hot pressing process, and the gas in the edge film part can be discharged more quickly, thereby greatly shortening the hot pressing time, improving production efficiency, and improving product quality.

[0031] (4) The innovative structural design of this invention can eliminate the auxiliary materials for the product interlayer, saving costs and time in making the interlayer. It is also suitable for loading and unloading with a robotic arm and can be used in automated production lines.

[0032] (5) The innovative design structure and suitable hardness of materials two and three greatly reduce the flatness requirements of the equipment pressure plate, and also greatly reduce the maintenance cost of the equipment pressure plate. Under the condition of no accidental bumps, it can almost achieve lifelong maintenance-free operation.

[0033] (6) Compared with traditional presses, the hot pressing time of the hot pressing structure and process of the present invention is greatly shortened from the original 180-240 seconds to 20-50 seconds, and the production efficiency is increased several times.

[0034] (7) The hot pressing structure and process of the present invention achieves different temperatures between the edge part and the middle CCM part of the product. According to actual measurement, the edge film can be more than 40°C higher than the middle CCM area, while the temperature distribution of the traditional press can only be the same everywhere.

[0035] (8) The present invention enables the frame part to bear almost all the pressure, which not only protects the membrane electrode CCM part, but also improves the pressing effect of the frame. At the same time, it also reduces the load of the hot press and greatly saves costs.

[0036] (9) The hot pressing process of this invention can be operated manually or by a robotic arm, so the press can be used as part of an automated production line, which is very beneficial to automated production, greatly improves production efficiency and reduces labor costs.

[0037] (10) The present invention makes the product appearance flatter, suitable for automated operation, and solves the safety risks of human operation; at the same time, the flatness requirements of the press plate are greatly reduced, reducing procurement and maintenance costs. [Image Description]

[0038] Figure 1 This is a structural diagram of a product manufactured using a traditional press;

[0039] Figure 2 This is a schematic diagram of the structure of the present invention;

[0040] Figure 3 This is a bottom view of the upper pressure plate of the present invention;

[0041] Figure 4 This is a top view of the lower pressure plate of the present invention;

[0042] Figure 5 This is a schematic diagram of the product after being pressed using a traditional press;

[0043] Figure 6 This is a schematic diagram of the product after compression according to an embodiment of the present invention;

[0044] In the diagram: 1. Upper pressure plate; 2. Lower pressure plate; 3. Material 1; 4. Material 3; 5. MEA product; 6. Material 2; 7. Adsorption hole; 8. Vacuum pump; 9. Upper pressure plate 2; 10. Lower pressure plate 2; 11. Upper padding layer; 12. Lower padding layer. [Detailed Implementation]

[0045] As attached Figure 2 To be continued Figure 4As shown, the present invention provides a hot pressing method and structure for a membrane electrode of a hydrogen fuel cell, comprising an upper pressing plate 1 and a lower pressing plate 2; wherein a first cavity is opened in the middle of the bottom of the upper pressing plate 1, the area of the first cavity is consistent with the size of the CCM region, a first material 3 is embedded in the first cavity, and the thickness of the first material 3 is 0.1 to 1 mm smaller than the depth of the first cavity; a third material 4 is bonded around the bottom surface of the upper pressing plate 1 with a high-temperature double-sided adhesive, the third material 4 is bonded in a "loop" shape, the third material 4 is used to quickly conduct the heat of the upper pressing plate 1 to the frame film region of the MEA product 5, the outer frame dimension of the "loop"-shaped third material 4 is 1 to 3 mm smaller than the outer edge dimension of the MEA product 5, and the inner frame dimension of the "loop"-shaped third material 4 is 1 to 2 mm smaller than the CCM region; a second cavity is opened in the middle of the top of the lower pressing plate 2, a second material 6 is embedded in the second cavity, the second material 6 is used to prevent heat loss of the MEA product 5, the lower surface of the second material 6 is bonded and reinforced with the bottom of the second cavity using a high-temperature double-sided adhesive, the upper surface of the second material 6 is bonded with a release film through a high-temperature double-sided adhesive, the total thickness of the second material 6, the high-temperature double-sided adhesive and the release film is 0 to 0.5 mm larger than the depth of the second cavity, suction holes 7 are arranged around or on both sides of the second cavity, the suction holes 7 are used to suck and fix the MEA product 5 to prevent the product from sliding and deforming, the interiors of the suction holes 7 are communicated by one cavity, the cavity is connected to an external vacuum pump 8 through a pipeline, the vacuum pump 8 provides negative pressure for the suction holes 7, and the thermal conductivity ranking of the first material 3, the second material 6 and the third material 4 is: thermal conductivity of the first material < thermal conductivity of the second material < thermal conductivity of the third material; by using three different materials in combination with the three-dimensional structures of the upper and lower pressing plates, the temperature of the product is distributed as required, the CCM region has a low temperature, and the frame portion has a high temperature, thereby achieving a good effect on the product, and the dimensions of the above three-dimensional structures match the shape of the product, so that the product obtains the maximum pressure at the frame position where pressure is needed, and there is almost no pressure at the CCM portion where pressure is not needed, thereby not only protecting the CCM portion of the membrane electrode, but also improving the pressing effect of the frame.

[0046] In the present invention, the upper and lower pressing plates are the main body of the entire structure, and the built-in heating function is used to heat the two plates; the first material is embedded in the cavity structure of the upper pressing plate, and since the first material has low thermal conductivity, it can prevent the temperature of the CCM region from being too high; the addition of the third material to the upper pressing plate allows heat to be quickly conducted from the upper pressing plate to the frame film region of the product; the hardness of the third material also functions to buffer pressure. The second material is filled in the cavity of the lower pressing plate, which can prevent heat loss of the product and ensure that the temperature of the frame film is within an appropriate range; suction holes are arranged around or on both sides of the cavity to suck and fix the product and prevent the product from sliding and deforming, and the vacuum pump provides negative pressure for the suction holes.

[0047] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0048] As one embodiment, the present invention consists of an upper pressing plate and a lower pressing plate, both of which have a built-in heating function, with a heating temperature range from normal temperature to 200°C. A cavity structure is fabricated in the middle of the upper pressing plate, the area of the cavity structure is consistent with the size of the CCM region, the depth of the cavity structure is 5 to 15 mm, a first material is embedded in the cavity structure, and the thickness of the first material is 0.1 to 1 mm less than the depth of the cavity structure. A "loop"-shaped third material is attached around the upper pressing plate using high-temperature double-sided adhesive. The thickness of the third material is 0.1 to 1 mm, the outer frame size thereof is 1 to 3 mm smaller on each side than the outer edge size of the product, and the inner frame size thereof is 1 to 2 mm smaller than the CCM region. A cavity is formed in the middle of the lower pressing plate, the periphery of the planar pattern of the cavity is 5 to 6 mm smaller than the entire membrane electrode, the depth of the cavity can be 1 to 10 mm, a second material is embedded in the cavity, the lower surface of the second material is bonded and reinforced with the bottom of the cavity using high-temperature double-sided adhesive, the upper surface of the second material is also bonded with a release film through high-temperature double-sided adhesive, and the total thickness of the second material, the high-temperature double-sided adhesive and the release film is 0 to 0.5 mm greater than the depth of the cavity. Suction holes are arranged around or on two sides of the cavity, the diameter of the suction holes is 0.3 to 1.5 mm, the spacing between the suction holes is 2 to 5 mm, the suction holes are arranged in a single row or multiple rows, and the distance between the suction holes and the edge of the product is 1 to 2 mm. The interiors of the suction holes are communicated by one cavity, and the cavity is connected to an external vacuum pump through a pipeline. Wherein, the order of thermal conductivity of the three materials must be: thermal conductivity of the first material < thermal conductivity of the second material < thermal conductivity of the third material. The first material needs to have certain air permeability. For the second material and the third material, in addition to meeting the above requirements for thermal conductivity, they must also be able to withstand a certain pressure, and the pressure that both materials can withstand is greater than 5 MPa. The hardness requirements for the two materials are that the Shore hardness of the second material ranges from 25 to 78 HA, and the Shore hardness of the third material ranges from 60 to 90 HA. This part of the structure replaces the two flat plates of a conventional press, and the functions of the rest of the conventional press do not need to be changed. The specific processing operation method and process are as follows:

[0049] 1) Preheat the equipment, turn on the heating functions of the upper and lower pressing plates, and after the set temperature is reached, stabilize for 3 to 5 minutes.

[0050] 2) The upper plate of the hot press rises to open a certain gap, and the recommended gap size is 200 to 500 mm.

[0051] 3) Place the product on the lower pressing plate by a mechanical arm or manually, so that the product is centered and aligned with the area of the second material.

[0052] 4) Start the vacuum pump, and the product is adsorbed on the lower pressing plate through the suction holes, and the recommended value of the vacuum degree at the suction holes is -20 to -85 kPa.

[0053] 5) The upper plate of the hot press descends to press the product, and maintains the set pressure, the recommended value of the pressure is 1000 to 6000 N, and the duration is a suitable time, with the recommended time being 20 to 50 seconds.

[0054] 6) The upper plate of the hot press rises to open a certain gap, the size of which is the same as that in the second step, the vacuum pump stops, and the product is taken down by a robotic arm or manually.

[0055] 7) The above process is repeated to sequentially perform the hot pressing process of multiple products.

[0056] As another further embodiment, the present invention consists of an upper pressing plate and a lower pressing plate, the upper and lower pressing plates have a built-in heating function, and the heating temperature ranges from normal temperature to 200°C. A cavity structure is fabricated in the middle of the upper pressing plate, the area of the cavity structure is consistent with the size of the CCM region, the depth of the cavity structure is 10mm, and a first material is embedded in the cavity structure, the thickness of the first material is 0.2mm smaller than the depth of the cavity structure. A "return"-shaped third material is pasted around the upper pressing plate with high-temperature double-sided adhesive. The thickness of the third material is 1mm, the size of its outer frame is 2mm smaller on each side than the outer edge size of the product, and the size of its inner frame is 2mm smaller than the CCM region. A cavity is opened in the middle of the lower pressing plate, the periphery of the planar pattern of the cavity is reduced by 5mm as a whole compared with the membrane electrode, the depth of the cavity is 10mm, and a second material is embedded in the cavity. The lower surface of the second material and the bottom of the cavity are bonded and reinforced with high-temperature double-sided adhesive, and the upper surface of the second material is also bonded with a release film through high-temperature double-sided adhesive. The total thickness of the second material, the high-temperature double-sided adhesive and the release film is 0.5mm larger than the depth of the cavity. Suction holes are arranged around or on both sides of the cavity, the diameter of the suction holes is 0.5mm, the spacing between the suction holes is 2mm, the suction holes are arranged in a single row, and the distance between the suction holes and the edge of the product is 1mm. The interior of the suction holes is communicated by one cavity, and the cavity is connected with an external vacuum pump through a pipeline. The thermal conductivity order of the three materials must be: thermal conductivity of the first material < thermal conductivity of the second material < thermal conductivity of the third material. The first material needs to have a certain air permeability. For the second material and the third material, in addition to meeting the above requirements for thermal conductivity, they must also be able to withstand a certain pressure, and the pressure that both materials can withstand is greater than 5MPa. The hardness requirements of the two materials are that the Shore hardness of the second material is in the range of 50HA, and the Shore hardness of the third material is in the range of 80HA. To meet the above requirements, in particular, aerogel with very low thermal conductivity is selected as the first material, silica gel meeting the hardness requirement is used as the second material, and silica gel filled with a thermal conductive agent and meeting the hardness requirement is used as the third material. The specific processing operation method and process are as follows:

[0057] 1) The equipment is preheated, the heating functions of the upper and lower pressing plates are turned on, and after the set temperature is reached, the temperature is stabilized for 5 minutes.

[0058] 2) The upper plate of the hot press rises to open a certain gap, and the size of the gap is 400mm.

[0059] 3) A robotic arm is used to place the product on the lower pressing plate, and the product is centered and aligned with the region of the second material.

[0060] 4) Start the vacuum pump and use the suction hole to adsorb the product onto the lower pressure plate. Set the vacuum level at the suction hole to -85 kPa.

[0061] 5) The upper platen of the hot press descends to press the product together and maintains the set pressure. The recommended pressure value is 3000N, and the duration is 30 seconds.

[0062] 6) The upper platen of the hot press rises, opening a certain gap. The size of the gap is the same as in step 2. The vacuum pump stops, and the product is removed by the robotic arm or manually.

[0063] 7) Repeat the above process to perform hot pressing of multiple products in sequence.

[0064] This embodiment has been tested in automated production and has achieved excellent results. The following is a comparison list:

[0065] Hot pressing time 180 seconds 30 seconds Production time per product 235 seconds 57 seconds Using manual 2 people 0 people Hot press pressure 5000N 3000N CCM area appearance It has expanded and occasionally wrinkles. The swelling was significantly reduced, and there were no wrinkles. Wavy border There are waves Excellent flatness bubble There are tiny bubbles No bubbles

[0066] Appendix Figure 5 and attached Figure 6 The images show a comparison of the actual products. Figure 5 Products pressed using traditional presses often have small air bubbles and are not flat enough, with the black CCM (corner cavities) expanding and deforming. Figure 6 The press structure of the present invention produces a smooth, clean product edge film surface after pressing, free from warping and bubbles, and the expansion and deformation of the black CCM portion is significantly reduced.

[0067] The contents not described in detail in this specification are existing technologies known to those skilled in the art. The standard parts used can be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0068] This invention is not limited to the above-described embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this invention shall be considered equivalent substitutions and shall be included within the scope of protection of this invention.

Claims

1. A hot-pressing structure for membrane electrode of hydrogen fuel cell, comprising an upper platen (1) and a lower platen (2), characterized in that: A first cavity is formed in the middle of the bottom of the upper platen (1), the area of the first cavity is consistent with the size of the CCM region, a first material (3) is embedded in the first cavity, and the thickness of the first material (3) is 0.1 to 1 mm smaller than the depth of the first cavity; a third material (4) is adhered to the periphery of the bottom surface of the upper platen (1) via high-temperature double-sided adhesive, the third material (4) is adhered in a shape of a Chinese character "hui" (closed loop), the third material (4) is used to rapidly conduct the heat of the upper platen (1) to the border film region of the MEA product (5), the outer frame dimension of the "hui"-shaped third material (4) is 1 to 3 mm smaller than the outer edge dimension of the MEA product (5), and the inner frame dimension of the "hui"-shaped third material (4) is 1 to 2 mm smaller than the CCM region; A second cavity is formed in the middle of the top of the lower platen (2), a second material (6) is embedded in the second cavity, the second material (6) is used to prevent heat loss of the MEA product (5), the lower surface of the second material (6) and the bottom of the second cavity are adhered and reinforced via high-temperature double-sided adhesive, the upper surface of the second material (6) is adhered with a release film via high-temperature double-sided adhesive, the total thickness of the second material (6), the high-temperature double-sided adhesive and the release film is 0 to 0.5 mm larger than the depth of the second cavity, suction holes (7) are arranged on the periphery or two sides of the second cavity, the suction holes (7) are used to suck and fix the MEA product (5) to prevent the product from sliding and deforming, the interiors of the suction holes (7) are communicated by one cavity, the cavity is connected with an external vacuum pump (8) through a pipeline, the vacuum pump (8) provides negative pressure for the suction holes (7), and the thermal conductivity of the first material (3), the second material (6) and the third material (4) is arranged in the order of thermal conductivity of the first material < thermal conductivity of the second material < thermal conductivity of the third material.

2. The hot-pressed structure of the hydrogen fuel cell membrane electrode as described in claim 1, characterized in that: The depth of the first cavity is 5 to 15 mm, and the thickness of the third material (4) is 0.1 to 1 mm.

3. The hot-pressed structure of the hydrogen fuel cell membrane electrode as described in claim 1, characterized in that: The depth of the second cavity is 1 to 10 mm, and the periphery of the plane figure of the second cavity is 5 to 6 mm smaller than the MEA product (5).

4. The hot-pressed structure of the hydrogen fuel cell membrane electrode as described in claim 1, characterized in that: The diameter of the suction holes (7) is 0.3 to 1.5 mm, the pitch of the suction holes (7) is 2 to 5 mm, the suction holes (7) are arranged in a single row or multiple rows, and the distance between the suction holes (7) and the edge of the MEA product (5) is 1 to 2 mm.

5. The hot-pressed structure of the hydrogen fuel cell membrane electrode as described in claim 1, characterized in that: The first material (3) is a gas-permeable material, and the pressure that the second material (6) and the third material (4) can bear is both greater than 5 MPa.

6. The hot-pressed structure of the hydrogen fuel cell membrane electrode as described in claim 1, characterized in that: The Shore hardness of the second material (6) ranges from 25 to 78 HA, and the Shore hardness of the third material (4) ranges from 60 to 90 HA.

7. The hot-pressed structure of the hydrogen fuel cell membrane electrode as described in claim 1, characterized in that: The first material (3) is selected as aerogel, the second material (6) is silica gel, and the third material (4) is silica gel filled with a thermal conductive agent.

8. A hot-pressing method for a hydrogen fuel cell membrane electrode hot-pressing structure as described in any one of claims 1 to 7, characterized in that, The method includes the following steps: 1) Preheating the equipment: turn on the heating functions of the upper platen (1) and the lower platen (2), and keep the temperature stable for 3 to 5 minutes after the set temperature is reached; 2) Raising the upper plate of the hot press to open a first gap, and the size of the first gap is 200 to 500 mm; 3) The robotic arm or manual placement of MEA product (5) on the lower pressure plate (2) aligns MEA product (5) with the area of ​​material 2 (6) in the center; 4) Start the vacuum pump (8) and adsorb the MEA product (5) onto the lower pressure plate (2) through the adsorption hole (7). The vacuum degree at the adsorption hole (7) is -20 to -85 kPa. 5) The upper platen of the hot press descends to press the MEA product (5) together and maintains the set pressure, which is 1000-6000N for 20-50 seconds; 6) The upper plate of the hot press rises, opening a certain gap two. The size of gap two is the same as that of gap one in step 2). The vacuum pump (8) stops, and the MEA product is removed by the robotic arm or manually. 7) Repeat the above process to perform hot pressing of multiple products in sequence.

Images