Electrolytic water film electrode water pressure packaging system and method

Abstract

The present application relates to a kind of electrolytic water film electrode water pressure packaging system and method, belong to electrolytic water hydrogen production technical field.The present application is easy to produce bubble, wrinkle and the size variation of film electrode for existing dry state packaging mode leads to the problem of sealing failure, provide a kind of wet state water pressure packaging scheme.System includes water storage tank, high-pressure pump, heater, packaging assembly, cooler and valve pipeline;Packaging assembly has upper and lower cavity plate, metal fiber sintered felt is arranged in cavity plate for uniform distribution of water pressure, and lower cavity plate is equipped with positioning rod.Method includes: after CCM is immersed in pure water and is fully swollen, pre-pressing positioning is carried out, then high-temperature high-pressure water is injected to make frame hot melt adhesive melt and discharge bubble, finally, normal temperature water is injected to cool and shape.The present application applies equal water pressure to both sides of the openwork area to eliminate shear force, realize bubble-free, wrinkle-free packaging.Experiments show that the yield of the present application reaches 99%, significantly better than traditional roll-to-roll packaging and face-to-face packaging, and process window is wide, easy to operate, low in cost.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, specifically to a water electrolysis membrane electrode hydrostatic encapsulation system and method. Background Technology

[0002] The membrane electrode assembly (MEA) is the most crucial component of a proton exchange membrane (PEM) fuel cell and a PEM electrolyzer, serving as the site of electrochemical reactions. A typical MEA consists of a proton exchange membrane, a catalyst layer, and a frame. The frame seals the MEA, preventing direct mixing of hydrogen and oxygen (which could lead to an explosion), while also providing mechanical support and protection to withstand the immense clamping pressure during stack assembly. Furthermore, the frame provides a precise and consistent geometry for the MEA, facilitating accurate alignment during stack assembly.

[0003] In existing technologies, the encapsulation methods for membrane electrode frames mainly include face-to-face encapsulation and roll-to-roll encapsulation. Face-to-face encapsulation involves attaching the sealing frame between upper and lower planes and encapsulating the catalyst-coated membrane (CCM) within it through hot pressing. This method requires extremely flat planes; however, in actual production, processing errors exist, and long-term use causes wear, making it difficult to meet the required flatness. Furthermore, during face-to-face pressing, air bubbles are difficult to expel from the frame and wrinkles are easily formed, affecting the sealing performance of the membrane electrode. Roll-to-roll encapsulation uses upper and lower heated rollers to encapsulate the sealing frame and CCM together. Because the contact between the rollers and the membrane electrode is line contact, and the membrane electrode lacks effective support during encapsulation, wrinkles are also prone to form, thus affecting the sealing effect.

[0004] All the aforementioned existing encapsulation processes share a common limitation: all encapsulation steps are performed in a dry state. There has long been a technical bias among those skilled in the art that encapsulating a dry membrane in a dry environment ensures encapsulation accuracy and dimensional stability, thereby avoiding process uncertainties caused by moisture. Therefore, existing technologies tend to adopt a "dry encapsulation" approach, without adequately considering the dimensional changes in the membrane electrode due to water absorption during subsequent actual operation.

[0005] However, proton exchange membranes (PEMs) exhibit significant hygroscopic swelling characteristics. Studies have found that PEMs shrink significantly when dry (shrinkage rates can reach 10%-15%), while they swell considerably upon contact with water, increasing in size. If the membrane electrode is encapsulated in a dry state, the expansion of the PEM during subsequent operation will cause wrinkles or ripples on the membrane surface. Wrinkled membranes experience uneven stress distribution during pressure assembly, making them prone to cracking or even perforation at hot spots or pressure points, severely impacting the lifespan and reliability of the membrane electrode.

[0006] Dry encapsulation also presents another technical challenge: the inconsistent dimensional changes between the wet PEM and the frame material after swelling. While the frame and adhesive materials show minimal dimensional change after absorbing water, the PEM swells significantly. This mismatch in dimensional changes leads to enormous internal stress within the membrane electrode assembly. Specifically, when the encapsulated membrane electrode absorbs water during operation, the PEM expands outwards, while the frame and adhesive layer, due to their relatively unchanged dimensions, form a rigid constraint, generating significant interfacial shear and tensile stresses. This internal stress not only causes uncontrollable deformation of the membrane electrode assembly (such as warping and twisting) but can also lead to failure of the adhesive interface between the PEM and the frame (i.e., seal failure), or even direct tearing of the PEM or frame material, rendering the entire membrane electrode unusable.

[0007] In summary, the existing "dry packaging" method cannot solve the problems of deformation, internal stress, and adhesive failure caused by PEM absorbing water and expanding. How to effectively overcome the above-mentioned technical difficulties while ensuring packaging quality is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] Therefore, it is necessary to provide an electrolytic water film electrode hydrostatic encapsulation system and method to solve the problems existing in the prior art.

[0009] To achieve the above objectives, the present invention provides a technical solution: A water electrolysis membrane electrode hydrostatic encapsulation system, the water electrolysis membrane electrode hydrostatic encapsulation system comprising, in sequence: The system includes a water storage tank, a high-pressure pump, a heater, an encapsulation assembly, a cooler, an inlet valve, a return valve, and an outlet valve. The inlet of the high-pressure pump is connected to the outlet of the water storage tank, the outlet of the high-pressure pump is connected to the inlet of the heater, and the outlet of the heater is connected to the inlet of the inlet valve. The encapsulation assembly includes an upper cavity plate, a lower cavity plate, and a driving device, wherein the driving device drives the upper cavity plate and the lower cavity plate to press together or separate. The upper cavity plate and the lower cavity plate are arranged opposite to each other. The upper cavity plate is provided with a first water inlet, a first water outlet and a first groove. The lower cavity plate is provided with a second water inlet, a second water outlet and a second groove. The first water inlet and the second water inlet are respectively connected in parallel to the outlet of the water inlet valve. The first water outlet and the second water outlet are respectively connected in parallel to the inlet of the water outlet valve. The outlet of the return water valve is connected to the inlet of the high-pressure pump to form a thermal pressure circulation loop; The outlet of the water valve is connected to the inlet of the cooler, and the outlet of the cooler is connected to the inlet of the water storage tank, forming a cold pressure circulation loop; Metal fiber sintered felt is disposed in the first groove and the second groove. The surface of the metal fiber sintered felt is flush with the inner surface of the upper cavity plate or the lower cavity plate, so as to evenly distribute the injected water to the surface of the membrane electrode. The lower cavity plate is provided with a positioning component, which is used to cooperate with the first positioning hole on the membrane electrode to achieve precise positioning of the membrane electrode.

[0010] Preferably, the first groove has a first ridge, the second groove has a second ridge, and the metal fiber sintered felt is fixed on the first ridge and the second ridge respectively.

[0011] Preferably, the metal fiber sintered felt includes at least one of nickel fiber sintered felt, stainless steel fiber sintered felt, and titanium fiber sintered felt.

[0012] Preferably, the porosity of the metal fiber sintered felt is 60%-80%.

[0013] Preferably, sealing rings are provided around the upper cavity plate and the lower cavity plate to form a sealed cavity during pressing.

[0014] Preferably, the upper cavity plate is provided with a second positioning hole, which cooperates with the positioning component on the lower cavity plate.

[0015] The present invention also provides a method for hydrostatic encapsulation of an electrolytic water film electrode, using the above-mentioned hydrostatic encapsulation system for the electrolytic water film electrode, comprising the following steps: S100. Immerse the CCM in the membrane electrode in pure water to fully swell it, so that the proton exchange membrane therein is in a wet state with maximum swelling, and obtain the pretreated membrane electrode. S200. After the pre-treated membrane electrode components are stacked and positioned sequentially by the positioning components, the upper cavity plate and the lower cavity plate are pressed together by the driving device to pre-press the membrane electrode. S300. Hot pressing step: While maintaining the pre-pressed state, high temperature and high pressure water is injected into the upper cavity plate and the lower cavity plate, so that the water is evenly distributed to both sides of the membrane electrode through the metal fiber sintered felt, so that the hot melt adhesive on the frame melts, and at the same time the air bubbles are discharged through water circulation. S400. Cold pressing step: After the hot pressing step is completed, room temperature high pressure water is injected into the upper cavity plate and the lower cavity plate to cool and shape the membrane electrode, so that the molten hot melt adhesive solidifies to form a sealed structure, and the encapsulated membrane electrode is obtained.

[0016] Preferably, in step S300, the pressure of the injected high-temperature and high-pressure water is 1 MPa to 2 MPa, the temperature is 50°C to 70°C, and the hot-pressing time is 1.5 min to 2 min.

[0017] Preferably, in step S400, the pressure of the room temperature high-pressure water is 1 MPa to 2 MPa, the temperature is 22℃ to 30℃, and the cold pressing time is 1 min to 1.5 min.

[0018] Preferably, in step S300, the return water valve is opened and the outlet water valve is closed.

[0019] The beneficial effects of this invention are: 1. Strong compatibility: By replacing the corresponding cavity plate, it can be compatible with the detection of different types of membrane electrodes.

[0020] 2. Using high-temperature and high-pressure water with the same normal operating conditions as the membrane electrode as the encapsulation medium ensures that the temperature and pressure are the same at all points of encapsulation, enabling the membrane electrode to be encapsulated without damage and with high quality.

[0021] 3. Wet encapsulation of membrane electrodes better meets the size requirements under operating conditions.

[0022] 4. It has a simple structure, is easy to assemble, is easy to operate, and has a low cost. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a system according to an embodiment; Figure 2 This is a perspective view of a packaging device according to one embodiment; Figure 3 This is a plan view of the cavity plate of a packaging device according to an embodiment; Figure 4 This is a plan view of the lower cavity plate of a packaging device according to one embodiment; Figure 5 This is a cross-sectional view of a membrane electrode package according to an embodiment, specifically... Figure 1 A sectional view of the dashed section; Figure 6 This is a planar schematic diagram of a membrane electrode according to one embodiment.

[0024] In the diagram, 100 is a water storage tank; 200 is a high-pressure pump; 300 is a heater; 400 is an encapsulation component; 410 is an upper cavity plate; 411 is a first water inlet; 412 is a first water outlet; 413 is a first groove; 414 is a first ridge; 415 is a first sealing ring; 420 is a lower cavity plate; 421 is a second water inlet; 422 is a second water outlet; 423 is a second groove; 424 is a second ridge; 425 is a second sealing ring; 430 is a drive unit; 440 is a metal fiber sintered felt; 500 is a cooler; 600 is a water inlet valve; 700 is a water return valve; 800 is a water outlet valve; 900 is a membrane electrode; 910 is a CCM; 920 is an upper frame; and 930 is a lower frame. Detailed Implementation

[0025] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0026] In the embodiments, unless otherwise specified, the experimental methods used are conventional methods, and the materials and reagents used are commercially available unless otherwise specified.

[0027] A water electrolysis film electrode hydrostatic encapsulation system, such as Figure 1 As shown, the electrolytic water membrane electrode hydrostatic encapsulation system comprises, in sequence: The system includes a water storage tank 100, a high-pressure pump 200, a heater 300, an encapsulation assembly 400, a cooler 500, an inlet valve 600, a return valve 700, and an outlet valve 800. The inlet of the high-pressure pump 200 is connected to the outlet of the water storage tank 100, the outlet of the high-pressure pump 200 is connected to the inlet of the heater 300, and the outlet of the heater 300 is connected to the inlet of the inlet valve 600. The encapsulation assembly 400 includes an upper cavity plate 410, a lower cavity plate 420, and a driving device 430. The driving device 430 drives the upper cavity plate 410 and the lower cavity plate 420 to press together or separate. More specifically, the driving device 430 is a four-column press.

[0028] The upper cavity plate 410 and the lower cavity plate 420 are arranged opposite to each other. The upper cavity plate 410 is provided with a first water inlet 411, a first water outlet 412 and a first groove 413. In some embodiments, the number of the first water inlets 411 is 2 and the number of the first water outlets 412 is 2.

[0029] The lower cavity plate 420 is provided with a second water inlet 421, a second water outlet 422 and a second groove 423; in some embodiments, the number of the second water inlets 421 is 2 and the number of the second water outlets 422 is 2.

[0030] The first inlet 411 and the second inlet 421 are connected in parallel to the outlet of the inlet valve 600; the first outlet 412 and the second outlet 422 are connected in parallel to the inlet of the outlet valve 800. The outlet of the return water valve 700 is connected to the inlet of the high-pressure pump 200 to form a thermal pressure circulation loop; The outlet of the water outlet valve 800 is connected to the inlet of the cooler 500, and the outlet of the cooler 500 is connected to the inlet of the water storage tank 100, forming a cold pressure circulation loop. Metal fiber sintered felt 440 is disposed in the first groove 413 and the second groove 423. In some embodiments, the number of metal fiber sintered felt 440 is 2. The surface of the metal fiber sintered felt 440 is flush with the inner surface of the upper cavity plate 410 or the lower cavity plate 420, for uniformly distributing the injected water to the surface of the membrane electrode 900. The lower cavity plate 420 is provided with a positioning component, which is used to cooperate with the first positioning hole on the membrane electrode 900 to achieve precise positioning of the membrane electrode 900.

[0031] Preferably, the first groove 413 is provided with a first ridge 414, the second groove 423 is provided with a second ridge 424, and the metal fiber sintered felt 440 is fixed on the first ridge 414 and the second ridge 424 respectively.

[0032] In some embodiments, the upper cavity plate 410 is provided with a first sealing ring 415 for sealing during clamping.

[0033] In some embodiments, the lower cavity plate 420 is provided with a second sealing ring 425 for sealing during clamping.

[0034] Preferably, the metal fiber sintered felt 440 includes at least one of nickel fiber sintered felt, stainless steel fiber sintered felt, and titanium fiber sintered felt.

[0035] Preferably, the porosity of the metal fiber sintered felt 440 is 60%-80%.

[0036] Preferably, sealing rings are provided around the upper cavity plate 410 and the lower cavity plate 420 respectively, for forming a sealed cavity during pressing.

[0037] Preferably, the upper cavity plate 410 is provided with a second positioning hole, which cooperates with the positioning component on the lower cavity plate 420.

[0038] The present invention also provides a water pressure encapsulation method for an electrolytic water film electrode 900, using the above-mentioned water pressure encapsulation system for the electrolytic water film electrode 900, comprising the following steps: S100. Immerse the CCM910 in the membrane electrode 900 in pure water to fully swell it, so that the proton exchange membrane therein is in a wet state with maximum swelling, and obtain the pretreated membrane electrode 900. S200. After the pre-treated membrane electrode 900 components are stacked and positioned sequentially by the positioning component, the upper cavity plate 410 and the lower cavity plate 420 are pressed together by the driving device 430 to pre-press the membrane electrode 900. S300. Hot pressing step: While maintaining the pre-pressed state, high temperature and high pressure water is injected into the upper cavity plate 410 and the lower cavity plate 420, so that the water is evenly distributed to both sides of the membrane electrode 900 through the metal fiber sintered felt 440, so that the hot melt adhesive on the frame melts, and at the same time the air bubbles are discharged through water circulation. S400. Cold pressing step: After the hot pressing step is completed, room temperature high pressure water is injected into the upper cavity plate 410 and the lower cavity plate 420 to cool and shape the membrane electrode 900, so that the molten hot melt adhesive is solidified to form a sealed structure, and the encapsulated membrane electrode 900 is obtained.

[0039] Preferably, in step S300, the pressure of the injected high-temperature and high-pressure water is 1 MPa to 2 MPa, the temperature is 50°C to 70°C, and the hot-pressing time is 1.5 min to 2 min.

[0040] Preferably, in step S400, the pressure of the room temperature high-pressure water is 1 MPa ~ 2 MPa, the temperature is 22℃ ~ 30℃, and the cold pressing time is 1 min ~ 1.5 min.

[0041] Preferably, in step S300, the return water valve 700 is opened and the outlet water valve 800 is closed.

[0042] The membrane electrode 900 consists of a catalyst-coated membrane (CCM910), an upper frame 920, and a lower frame 930. Positioning holes are provided on the CCM910, the upper frame 920, and the lower frame 930. Since the membrane electrode 900 is easily deformed by temperature and humidity, positioning rods around the upper perimeter of the lower cavity plate 420 are connected to the positioning holes on the membrane electrode 900. This allows the membrane electrode 900 to extend smoothly on the plane formed by the lower cavity plate 420 and the metal fiber sintered felt 440, preventing damage to the membrane electrode 900 during pressing. Example 1

[0043] S100. Pretreatment (wet setting) Immerse the CCM in pure water at 22°C for 15 hours to allow the proton exchange membrane to fully swell to its maximum swelling state. After removal, gently blot away any surface water with clean filter paper and set aside.

[0044] S200. Pre-compression positioning Place the lower frame onto the positioning rod of the lower cavity plate through the positioning hole, with the adhesive side facing up, and flat on the metal fiber sintered felt. Place the pretreated CCM onto the positioning rod through the positioning hole, and flat on the adhesive surface of the lower frame. Place the upper frame onto the positioning rod through the positioning hole, with the adhesive side facing down, and flat on the CCM. Start the four-column press to drive the upper and lower cavity plates to press together, pre-pressing the membrane electrode at a pressure of 1.5 MPa for 1 minute.

[0045] S300. Thermo-pressed encapsulation The four-column press is started to drive the upper and lower chamber plates to press together, pressurizing the membrane electrode to a pressure of 2.2 MPa. The inlet valve is opened, the outlet valve is closed, and the return valve is opened. Room temperature and pressure water from the storage tank is pumped into the heater via a high-pressure pump, heated to 70°C, and then injected into the upper and lower chamber plates at a pressure of 2 MPa. The water is evenly distributed to both sides of the membrane electrode through the sintered metal fiber felt. The process is maintained under hot-press conditions for 2 minutes to allow the hot melt adhesive on the frame to fully melt, while water circulation removes micro-bubbles. During this period, the water pressure in the upper and lower chamber plates remains equal.

[0046] S400. Cold pressing and shaping Turn off the heater, close the return water valve, and open the outlet water valve. Switch to the ambient temperature circulating water circuit and inject ambient temperature (25°C) water into the upper and lower chamber plates at a pressure of 2MPa. Cool and set for 1.5 minutes to allow the molten hot melt adhesive to solidify and form a sealed structure.

[0047] S500. Depressurization and component removal Close the inlet valve, open the vent valve to release the pressure inside the cavity, raise the upper cavity plate, and remove the encapsulated membrane electrode.

[0048] To verify the process tolerance of the packaging method of the present invention and the influence of different process parameters on the packaging effect, multiple sets of experiments were conducted following the steps of Example 1, only changing the pressure, temperature, and time of the hot pressing stage. The specific process parameters and packaging effects are shown in Table 1.

[0049] Table 1 Packaging experiments with different process parameters As can be seen from Table 1, Examples 2-5 (hot water pressure 1.5-1.8MPa, hot water temperature 60-70℃) all achieved good sealing effects without bubbles or wrinkles.

[0050] In Example 6, the hot water pressure was reduced to 1.0 MPa (other parameters were similar to those in Example 5), and bubbles appeared after encapsulation. The reason for this was that the low pressure caused insufficient flow of the hot melt adhesive on the frame after melting, which prevented it from completely filling the interface and allowing tiny gases to be effectively expelled.

[0051] In Example 7, the hot water temperature was reduced to 50°C (other parameters were similar to those in Example 4), and wrinkles appeared after encapsulation. The reason for this was that the low temperature prevented the hot melt adhesive on the frame from softening sufficiently, and the proton exchange membrane in the CCM did not reach its optimal swelling state. After cooling, internal stress was generated, leading to wrinkles.

[0052] The above results show that the encapsulation method of the present invention can stably obtain a bubble-free and wrinkle-free encapsulation effect within the range of hot water pressure of 1.5-1.8MPa and hot water temperature of 60-70℃, and has a wide process window.

[0053] The membrane electrodes prepared in Examples 2-7 were assembled into single cells, and their water electrolysis performance was tested under the same conditions. Test conditions: current density 3 A / cm² 2 The temperature was 60℃. The test results are shown in Table 2.

[0054] Table 2 Performance of single-cell membrane electrode arrays prepared with different process parameters As can be seen from Table 2, the battery voltages of Examples 2-5 (with good encapsulation effect) are all below 1.81V, demonstrating excellent electrolysis performance.

[0055] The battery voltage in Example 6 (with bubbles) increased to 1.846V, which is 38mV higher than that in Example 5 (1.808V).

[0056] The battery voltage of Example 7 (with folds) increased to 1.877V, which is 78mV higher than that of Example 4 (1.799V).

[0057] This is because bubbles and wrinkles generated during the encapsulation process can lead to poor contact at the internal interface of the membrane electrode. On the one hand, this causes micro-leakage, allowing hydrogen and oxygen generated during electrolysis to cross-permeate and reducing Faraday efficiency; on the other hand, it increases the contact resistance between the membrane electrode and the frame, resulting in increased ohmic polarization. Both of these factors lead to increased cell voltage and increased electrolysis energy consumption at the same current density. Therefore, the preferred process parameter range of this invention (hot water pressure 1.5-1.8 MPa, hot water temperature 60-70℃) is crucial for obtaining high-quality, high-performance membrane electrodes.

[0058] Comparative Experiment: Yield Comparison with Traditional Packaging Methods To verify the advantages of the present invention over the prior art, 100 film electrodes were prepared using traditional roller-to-roll encapsulation, face-to-face encapsulation, and the water pressure encapsulation of the present invention (using the process parameters of Example 4), respectively, and the number of defective products with bubbles and wrinkles was counted.

[0059] The packaging process for the control group is as follows: 1. Roll-to-roll encapsulation (control group 1) After stacking the frame and CCM in sequence, they are fed into a roller-to-roll hot press. The hot press roller temperature is 80℃, the linear pressure is 1.0MPa, and the belt speed is 0.5m / min, completing the encapsulation in one go.

[0060] 2. Face-to-face sealing (Control Group 2) After stacking the frame and CCM in sequence, place them in a flatbed hot press. The hot pressing temperature is 70℃ and the pressure is 2MPa. After holding the pressure for 2 minutes, remove them and let them cool naturally.

[0061] Defective Product Detection and Statistics: After packaging, each membrane electrode is visually inspected, and the number of defects such as bubbles and wrinkles is counted.

[0062] Bubble judgment criteria: Under a 100x optical microscope, observe the interface between the frame and the CCM. Bubbles with a diameter greater than 0.1mm are considered defective. Criteria for judging wrinkles: Under standard light source, visual inspection is conducted. If obvious wavy undulations or folds appear on the film surface, it is considered defective.

[0063] The test results are shown in Table 3: Table 3. Statistical results of defects (bubbles, wrinkles) in different production methods As can be seen from Table 3, the yield of membrane electrodes obtained by using the roll-to-roll and face-to-face encapsulation method of this application reaches 99%, which is significantly better than the traditional roll-to-roll and face-to-face encapsulation methods.

[0064] This is because the present invention uses high-temperature and high-pressure water as the encapsulation medium. The fluidity and adaptability of water to any shape enable it to displace microbubbles from the interface and carry them away with the water flow, while traditional mechanical pressing is difficult to remove microbubbles.

[0065] Water pressure is evenly distributed across the entire membrane surface, avoiding localized stress concentration and membrane damage common in mechanical pressing.

[0066] The wet pretreatment before encapsulation ensures that the proton exchange membrane is in a state of maximum swelling during encapsulation, resulting in minimal dimensional changes during subsequent operation and effectively suppressing the formation of wrinkles.

[0067] It should be noted that the specific parameters or reagents in the above embodiments are specific or preferred embodiments under the concept of the present invention, and not limitations thereof; those skilled in the art can make adaptive adjustments within the concept and protection scope of the present invention.

Claims

1. A water electrolysis membrane electrode hydrostatic encapsulation system, characterized in that, The electrolytic water membrane electrode hydrostatic encapsulation system comprises, in sequence: The system includes a water storage tank, a high-pressure pump, a heater, an encapsulation assembly, a cooler, an inlet valve, a return valve, and an outlet valve. The inlet of the high-pressure pump is connected to the outlet of the water storage tank, the outlet of the high-pressure pump is connected to the inlet of the heater, and the outlet of the heater is connected to the inlet of the inlet valve. The encapsulation assembly includes an upper cavity plate, a lower cavity plate, and a driving device, wherein the driving device drives the upper cavity plate and the lower cavity plate to press together or separate. The upper cavity plate and the lower cavity plate are arranged opposite to each other. The upper cavity plate is provided with a first water inlet, a first water outlet and a first groove. The lower cavity plate is provided with a second water inlet, a second water outlet and a second groove. The first water inlet and the second water inlet are respectively connected in parallel to the outlet of the water inlet valve. The first water outlet and the second water outlet are respectively connected in parallel to the inlet of the water outlet valve. The outlet of the return water valve is connected to the inlet of the high-pressure pump to form a thermal pressure circulation loop; The outlet of the water valve is connected to the inlet of the cooler, and the outlet of the cooler is connected to the inlet of the water storage tank, forming a cold pressure circulation loop; Metal fiber sintered felt is disposed in the first groove and the second groove. The surface of the metal fiber sintered felt is flush with the inner surface of the upper cavity plate or the lower cavity plate, so as to evenly distribute the injected water to the surface of the membrane electrode. The lower cavity plate is provided with a positioning component, which is used to cooperate with the first positioning hole on the membrane electrode to achieve precise positioning of the membrane electrode.

2. The electrolytic water membrane electrode hydrostatic encapsulation system according to claim 1, characterized in that, The first groove has a first ridge, and the second groove has a second ridge. The metal fiber sintered felt is fixed on the first ridge and the second ridge, respectively.

3. The electrolytic water membrane electrode hydrostatic encapsulation system according to claim 1, characterized in that, The metal fiber sintered felt includes at least one of nickel fiber sintered felt, stainless steel fiber sintered felt, and titanium fiber sintered felt.

4. The electrolytic water membrane electrode hydrostatic encapsulation system according to claim 1, characterized in that, The porosity of the metal fiber sintered felt is 60%-80%.

5. The electrolytic water membrane electrode hydrostatic encapsulation system according to claim 1, characterized in that, The upper cavity plate and the lower cavity plate are respectively provided with sealing rings around their perimeter to form a sealed cavity during pressing.

6. The electrolytic water membrane electrode hydrostatic encapsulation system according to claim 1, characterized in that, The upper cavity plate is provided with a second positioning hole, which cooperates with the positioning component on the lower cavity plate.

7. A method for hydrostatically encapsulating an electrolytic water film electrode, using the hydrostatically encapsulating system for an electrolytic water film electrode as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S100. Immerse the CCM in the membrane electrode in pure water to fully swell it, so that the proton exchange membrane therein is in a wet state with maximum swelling, and obtain the pretreated membrane electrode. S200. After the pre-treated membrane electrode components are stacked and positioned sequentially by the positioning components, the upper cavity plate and the lower cavity plate are pressed together by the driving device to pre-press the membrane electrode. S300. Hot pressing step: While maintaining the pre-pressed state, high temperature and high pressure water is injected into the upper cavity plate and the lower cavity plate, so that the water is evenly distributed to both sides of the membrane electrode through the metal fiber sintered felt, so that the hot melt adhesive on the frame melts, and at the same time the air bubbles are discharged through water circulation. S400. Cold pressing step: After the hot pressing step is completed, room temperature high pressure water is injected into the upper cavity plate and the lower cavity plate to cool and shape the membrane electrode, so that the molten hot melt adhesive solidifies to form a sealed structure, and the encapsulated membrane electrode is obtained.

8. The method according to claim 7, characterized in that, In step S300, the pressure of the injected high-temperature and high-pressure water is 1 MPa ~ 2 MPa, the temperature is 50℃ ~ 70℃, and the hot-pressing time is 1.5 min ~ 2 min.

9. The method according to claim 7, characterized in that, In step S400, the pressure of the room temperature high-pressure water is 1 MPa to 2 MPa, the temperature is 22℃ to 30℃, and the cold pressing time is 1 min to 1.5 min.

10. The method according to claim 7, characterized in that, In step S300, the return water valve is opened and the outlet water valve is closed.

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