Membrane electrode, electrolytic cell device, manufacturing method of membrane electrode and hot pressing mold

Abstract

The invention relates to the technical field of electrolytic cells, in particular to a membrane electrode for hydrogen production through ultrahigh-pressure water electrolysis, an electrolytic cell device, a manufacturing method of the membrane electrode, a hot-pressing mold and hot-pressing forming equipment. Two plastic frames are arranged on the two sides of an exchange membrane, each plastic frame is provided with a hollowed-out part, the exchange membrane covers the hollowed-out part and forms an electrolysis cavity with the hollowed-out part, flow guide grooves and flow guide holes connected with the flow guide grooves are formed in the plastic frames, and the two ends of the flow guide grooves are connected with the flow guide holes and the electrolysis cavity on one side of the exchange membrane; the membrane electrode is prepared through an integrated process, and the two plastic frames and the exchange membrane form an integrated structure, so that no gap exists between the electrolysis chamber and the exchange membrane, the problem of loose connection of all parts caused by the fact that the membrane electrode is impacted by internal high pressure is avoided, the sealing effect of the electrolysis chamber is improved, and the service life of the membrane electrode is prolonged. And the strength of the membrane electrode with the integrated structure is increased, so that the membrane electrode can be suitable for a higher pressure environment, and the efficiency of water electrolysis hydrogen production is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrolyzers, and in particular to a membrane electrode for ultra-high pressure water electrolysis to produce hydrogen, an electrolyzer device, a method for manufacturing the membrane electrode, a hot pressing mold, and hot pressing molding equipment. Background Art

[0002] In the field of hydrogen production by water electrolysis, an electrolyzer is usually used to electrolyze water to produce hydrogen and oxygen. The electrolyzer consists of a tank body, an anode, a cathode and a diaphragm. The diaphragm is arranged between the anode and the cathode to separate the anode chamber from the cathode chamber. Electrolyte is added to the electrolyzer. When direct current passes through the electrolyzer, an oxidation reaction occurs at the interface between the anode and the solution, and a reduction reaction occurs at the interface between the cathode and the solution to produce the required gas.

[0003] In the prior art, the electrolyzer is usually formed by splicing structures such as anode plates, exchange membranes, and cathode plates in a sandwich manner. A sealing ring is also provided between or around the anode plate and the cathode plate to seal the anode chamber and cathode chamber on both sides of the exchange membrane. After the electrolyzer is spliced, the sandwich structure is usually fastened with bolt fasteners and fixed to the end plate. Since the electrolyzer undergoes a chemical reaction during the hydrogen production process, the pressure in the electrolyzer rises. Under normal pressure, the traditional electrolyzer structure can meet the sealing effect of the electrolyzer. However, in a hydrogen production environment with high pressure requirements, the sandwich structure of the electrolyzer is easily deformed and loosened due to the impact of the internal high pressure, and the soft material of the sealing ring is also easily deformed under high pressure, and will loosen with the deformation of the sandwich structure of the electrolyzer, resulting in sealing failure. Therefore, the electrolyzer structure of the traditional sandwich splicing method is difficult to meet the sealing and strength requirements under high pressure environments. Summary of the invention

[0004] In order to solve or at least partially solve the above technical problems, the present application provides a membrane electrode for ultra-high pressure water electrolysis hydrogen production, comprising:

[0005] Exchange membrane;

[0006] Two plastic frames are arranged on both sides of the exchange membrane, each of the plastic frames has a hollow portion, the exchange membrane covers the hollow portion and forms a chamber with the hollow portion, a guide groove and a guide hole connected to the guide groove are formed on the plastic frame, and two ends of the guide groove are connected to the guide hole and the chamber on one side of the exchange membrane;

[0007] The diversion hole passes through the two plastic frames;

[0008] The two plastic frames are integrally bonded and connected.

[0009] Optionally, the membrane electrode for producing hydrogen by ultra-high pressure water electrolysis further comprises:

[0010] The material of the membrane electrode is at least one of the following materials or a combination thereof:

[0011] PEEK;

[0012] PVDF;

[0013] PCTFE;

[0014] PFA;

[0015] PPS;

[0016] PEI;

[0017] PPSU;

[0018] PC;

[0019] PP;

[0020] PE;

[0021] ABS;

[0022] POM;

[0023] nylon.

[0024] Optionally, an integrated sealing line is provided on the outer surface of the plastic frame, and the sealing line is used to form a sealed cavity together with an externally arranged sealing member.

[0025] The present application also provides an electrolyzer device, in which the membrane electrode for producing hydrogen by ultra-high pressure water electrolysis as described above is arranged.

[0026] The present application also provides a method for manufacturing a membrane electrode, comprising the following steps:

[0027] The exchange membrane is arranged between two plastic frames stacked on top of each other;

[0028] Apply pressure to squeeze the two plastic frames against each other;

[0029] heating the plastic frame to at least partially soften it;

[0030] After cooling, a formed membrane electrode is obtained.

[0031] Optionally, in the step of applying pressure to the plastic frame, the applied pressure is between 0.2 MPa and 0.7 MPa.

[0032] Optionally, when the material of the membrane electrode is at least one of the following materials or a combination thereof:

[0033] PEEK;

[0034] PVDF;

[0035] PCTFE;

[0036] PFA;

[0037] PPS;

[0038] PEI;

[0039] PPSU;

[0040] In the step of applying pressure to the plastic frame, the applied pressure is 0.3 Mpa;

[0041] When the material of the membrane electrode is at least one of the following materials or a combination thereof:

[0042] PC;

[0043] PP;

[0044] PE;

[0045] ABS;

[0046] POM;

[0047] nylon;

[0048] In the step of applying pressure to the plastic frame, the applied pressure is 0.5 MPa.

[0049] Optionally, in the step of heating the plastic frame, a heating target temperature of the plastic frame is between 120°C and 150°C.

[0050] Optionally, before the step of applying pressure to the plastic frame, the method further comprises:

[0051] A guide protrusion is arranged on the mold so as to directly form an integrated guide groove on the surface of the plastic frame during the hot pressing process.

[0052] Optionally, before the step of applying pressure to the plastic frame, the method further comprises:

[0053] A sealing line groove is arranged on the mold so as to directly form an integrated sealing line on the surface of the plastic frame during the hot pressing process.

[0054] Optionally, in the step of heating the plastic frame to at least partially soften it, heating is performed in any one of the following ways:

[0055] The heated mold is directly contacted with the plastic frame for heating;

[0056] Coating a soldering agent on the surface of the plastic frame, and irradiating the surface of the plastic frame with a laser to heat it;

[0057] The plastic frame is locally heated by using ultrasonic waves.

[0058] The present application also provides a hot pressing mold for manufacturing the membrane electrode as described above, wherein the hot pressing mold is provided with:

[0059] A hot pressing tank, the hot pressing tank can accommodate the membrane electrode, the hot pressing tank is hollow to form an escape space to avoid the exchange membrane;

[0060] A hot pressing column, arranged in the hot pressing groove corresponding to the guide hole;

[0061] A guide protrusion is arranged in the hot pressing groove, and two sides of the guide protrusion are respectively connected to the hot pressing column and the avoidance space.

[0062] Optionally, a sealing wire groove is also provided on the hot pressing mold.

[0063] The present application also provides a hot pressing molding device, on which the hot pressing mold as described above is provided.

[0064] The membrane electrode for ultra-high pressure water electrolysis hydrogen production provided by the present application has two plastic frames arranged on both sides of the exchange membrane, each plastic frame has a hollow portion, the exchange membrane covers the hollow portion and forms an electrolysis chamber with the hollow portion, a guide groove and a guide hole connected to the guide groove are formed on the plastic frame, the two ends of the guide groove are connected to the guide hole and the electrolysis chamber on one side of the exchange membrane, and the guide hole runs through the two plastic frames; the two plastic frames are integrally bonded to form an electrolysis chamber on both sides with the exchange membrane, so that there is no gap between the electrolysis chamber and the exchange membrane, thereby avoiding the problem of loose connection of various components caused by the internal high pressure impact of the membrane electrode, and improving the sealing effect of the electrolysis chamber; the membrane electrode of the present application is made by an integrated process, the membrane electrode as a whole is an integrated structure, the strength is increased, and it can be used in a higher pressure environment, thereby effectively improving the efficiency of water electrolysis hydrogen production.

[0065] The electrolyzer device provided in the present application adopts the membrane electrode for ultra-high pressure water electrolysis hydrogen production as described above. The strength of the electrolyzer device is increased, and the electrolysis chamber can withstand a higher pressure environment to meet the hydrogen production needs in a high-pressure environment.

[0066] The membrane electrode manufacturing method provided in the present application sets the exchange membrane between two plastic frames stacked on each other, applies pressure to squeeze the two plastic frames against each other, heats the plastic frames to soften them at least partially, and cools them to obtain a formed membrane electrode, which also has all the advantages described above.

[0067] The hot pressing mold and hot pressing molding equipment provided in the present application can manufacture the membrane electrode as described above, and therefore, also have all the advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the implementation of the present application, the following is a brief introduction to the relevant drawings. It is understood that the drawings described below are only used to illustrate some implementations of the present application, and ordinary technicians in this field can also obtain many other technical features and connection relationships not mentioned in this article based on these drawings.

[0069] Figure 1 It is a schematic diagram of the structure of one side of the membrane electrode of the present application;

[0070] Figure 2 is a schematic diagram of the structure of the other side of the membrane electrode of the present application;

[0071] Figure 3 It is a schematic diagram of the exploded structure of the membrane electrode of the present application;

[0072] Figure 4 It is a schematic diagram of the connection state of the exchange membrane of the membrane electrode of the present application;

[0073] Figure 5 It is a structural schematic diagram of the electrolytic cell device of the present application;

[0074] Figure 6 It is a flowchart of the steps of the method for manufacturing the membrane electrode of the present application;

[0075] Figure 7 This is a physical picture of the membrane electrode of this application.

[0076] Description of reference numerals:

[0077] 10. exchange membrane; 110. bonding area;

[0078] 21, cathode frame; 211, first hollow portion; 22, anode frame; 221, second hollow portion;

[0079] 31. Hydrogen flow hole; 311. Hydrogen flow groove; 32. Oxygen flow hole; 321. Oxygen flow groove; 33. Electrolyte flow hole; 331. Electrolyte flow groove;

[0080] 40. Sealing line;

[0081] 50. Washer;

[0082] 60. Cathode plate;

[0083] 70. Anode plate. DETAILED DESCRIPTION

[0084] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the 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.

[0085] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0086] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0087] The technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application.

[0088] First embodiment

[0089] The first embodiment of the present application proposes a membrane electrode for ultra-high pressure water electrolysis to produce hydrogen. The membrane electrode is a part of an electrolyzer device, which is arranged between an anode chamber and a cathode chamber to isolate the two, and is used to produce hydrogen.

[0090] like Figure 1 and Figure 2 As shown, the membrane electrode of this embodiment includes an exchange membrane 10 and two plastic frames arranged on both sides of the exchange membrane 10, the plastic frames are plate-like structures, each plastic frame has a hollow portion, and the two plastic frames have the same shape, the hollow portions on the two plastic frames are located at corresponding positions, and when the two plastic frames are stacked, the two plastic frames clamp the exchange membrane 10, and the exchange membrane 10 isolates the two corresponding hollow portions.

[0091] like Figure 1 and Figure 2 As shown, the two plastic frames are respectively a cathode frame 21 and an anode frame 22 , the hollow portion on the cathode frame 21 is a first hollow portion 211 , and the hollow portion on the anode frame 22 is a second hollow portion 221 .

[0092] like Figure 3 and Figure 4 As shown, in this embodiment, the area of ​​the exchange membrane 10 is larger than the area of ​​the first hollow portion 211 and the second hollow portion 221, and the exchange membrane 10 is disposed between the cathode frame 21 and the anode frame 22, and the cathode frame 21 and the anode frame 22 are integrally bonded and connected, so that the exchange membrane 10 forms a whole with the cathode frame 21 and the anode frame 22. The exchange membrane 10 can completely cover the first hollow portion 211 and the second hollow portion 221 and separate the two.

[0093] Since the cathode frame 21 and the anode frame 22 themselves have a certain thickness, when the exchange membrane 10 separates the first hollow portion 211 from the second hollow portion 221, the first hollow portion 211 forms a cathode chamber (the enclosed space formed by the first hollow portion 211 and the cathode plate is the cathode chamber, and the first hollow portion 211 can be understood as a part of the cathode chamber at this time), and the second hollow portion 221 forms an anode chamber (similarly, the enclosed space formed by the second hollow portion 221 and the anode plate is the anode chamber, and the second hollow portion 221 can be understood as a part of the anode chamber at this time).

[0094] The cathode frame 21 and the anode frame 22 are respectively provided with corresponding flow guide holes. When the cathode frame 21 and the anode frame 22 are bonded together, the flow guide holes are correspondingly connected to form a channel, and the flow guide holes penetrate the cathode frame 21 and the anode frame 22 to form a channel. The cathode frame 21 and the anode frame 22 are also respectively provided with flow guide grooves connected to the flow guide holes, and the two ends of the flow guide grooves are connected to the flow guide holes and the chamber on one side of the exchange membrane.

[0095] The guide holes include hydrogen guide holes 31 , oxygen guide holes 32 and electrolyte guide holes 33 , and the guide grooves include hydrogen guide grooves 311 , oxygen guide grooves 321 and electrolyte guide grooves 331 .

[0096] The hydrogen guide hole 31 is connected to the cathode chamber formed by the first hollow part 211 through the hydrogen guide groove 311, and the oxygen guide hole 32 is connected to the anode chamber formed by the second hollow part 221 through the oxygen guide groove 321; the electrolyte guide hole 33 is connected to the anode chamber formed by the second hollow part 221 through the electrolyte guide groove 331.

[0097] In one embodiment, the electrolyte conducting holes 33 and the oxygen conducting holes 32 are disposed on opposite sides of the second hollow portion 221 .

[0098] During the hydrogen production process, after the membrane electrode of this embodiment is installed in conjunction with the electrode plate, the electrode plate is energized, and electrolyte is introduced into the electrolyte guide hole 33. The electrolyte enters the anode chamber along the electrolyte guide groove 331. As an oxidation reaction occurs in the anode chamber, a reduction reaction occurs in the cathode chamber. The oxygen in the anode chamber enters the oxygen guide hole 32 from the oxygen guide groove 321 and is discharged, and the hydrogen in the cathode chamber enters the hydrogen guide hole 31 from the hydrogen guide groove 311, thereby achieving hydrogen preparation.

[0099] It is worth mentioning that the exchange membrane 10 of this embodiment is not just a clamping relationship with the cathode frame 21 and the anode frame 22, but is bonded into a whole by hot pressing. The exchange membrane 10, the cathode frame 21 and the anode frame 22 form an integrated structure, so that there is no gap between the electrolysis chamber and the exchange membrane, avoiding the problem of loose connection of each component caused by the internal high pressure impact of the membrane electrode, improving the sealing effect of the electrolysis chamber, and the strength of the integrated membrane electrode is increased, which can be used in a higher pressure environment. Through the membrane electrode of this embodiment, hydrogen with a pressure of 35MPa can be directly produced, effectively improving the efficiency of hydrogen production by water electrolysis.

[0100] like Figure 4 As shown, the edge portions of the first hollow portion 211 and the second hollow portion 221 are laminated around the exchange membrane 10, and the laminated portions are softened and pressed by a hot pressing process to form an integral bonding area 110, that is, the gaps between the cathode frame 21, the anode frame 22 and the exchange membrane 10 are eliminated, which is beneficial to the sealing of the electrolysis chamber. The exchange membrane 10 is integrated with the plastic frame by the hot pressing process, avoiding the assembly process of the exchange membrane 10 and improving the equipment installation efficiency.

[0101] In this embodiment, the material of the membrane electrode can be one of PEEK, PVDF, PCTFE, PFA, PPS, PEI, PPSU, PC, PP, PE, ABS, POM, and nylon, and of course it can be a combination of two or more thereof.

[0102] The plastic frame can be made of materials such as engineering plastics. The above-mentioned materials for making the membrane electrode and the plastic frame made of engineering plastics can be stably combined under the hot pressing molding process to form an integral component. The component is used in the electrolyzer device, which avoids the gap problem formed by the components when the electrolyzer device is assembled and improves the sealing effect. The integrated membrane electrode increases the strength of the electrolyzer device, can be used in a higher pressure environment, and can directly produce hydrogen at a pressure of 35MPa.

[0103] Further, such as Figure 1 and Figure 2As shown, the outer surfaces of the cathode frame 21 and the anode frame 22 of this embodiment are provided with an integrated sealing line 40 , and the sealing line 40 is used to form a sealed cavity together with an externally provided sealing member.

[0104] For example, gaskets are added to the outer surfaces of the cathode frame 21 and the anode frame 22, and the gaskets are arranged between the plastic frame and the electrode plate to seal the electrolysis chamber. The gaskets can be made of polytetrafluoroethylene sheet material, which has better hardness than silicone rings or rubber rings and can adapt to high pressure environments. The polytetrafluoroethylene sheet material can squeeze the sealing line 40, thereby enhancing the sealing effect.

[0105] In one embodiment, the cathode frame 21 and the anode frame 22 are arranged in a circular shape. After the cathode frame 21 and the anode frame 22 are assembled, an "O"-shaped sealing ring can be sleeved on the outside thereof. The sealing ring can be a rubber ring or a silicone ring, which improves the strength of the membrane electrode structure while further enhancing the sealing performance.

[0106] Considering that the membrane electrode needs to withstand ultra-high pressure stress from internal disorder, the "O"-ring can change and orderly disperse the longitudinal pressure into lateral pressure to ensure that the device is sealed tightly and safely.

[0107] Based on the same principle, the sealing line 40 mentioned above can also be set to a circle to form an "O"-shaped sealing ring, which disperses the longitudinal pressure on the surface of the cathode frame 21 and the anode frame 22 into lateral pressure, thereby enhancing the sealing performance.

[0108] Second embodiment

[0109] The second embodiment of the present application proposes an electrolyzer device, in which the membrane electrode for producing hydrogen by ultra-high pressure water electrolysis mentioned in the above embodiment is arranged.

[0110] Specifically, Figure 5 As shown, the electrolyzer device includes a cathode plate 60 and an anode plate 70, and a gasket 50 is further arranged between the membrane electrode and the cathode plate 60 and the anode plate 70. The cathode plate 60, the gasket 50 and the membrane electrode form a cathode chamber, and the anode plate 70, the gasket 50 and the membrane electrode form an anode chamber.

[0111] The gasket 50 may be the polytetrafluoroethylene sheet structure mentioned in the above embodiment.

[0112] As the structure and principle of the electrolytic cell device are common knowledge in the art and combined with the working principle of the membrane electrode mentioned in the above embodiment, they will not be elaborated in this embodiment.

[0113] The electrolyzer device provided in this embodiment has all the advantages as described above because of the membrane electrode for ultra-high pressure water electrolysis hydrogen production mentioned in the above embodiments.

[0114] Third embodiment

[0115] The third embodiment of the present application proposes a method for manufacturing a membrane electrode, which uses an integrated hot pressing process to manufacture a membrane electrode with an integrated structure, such as Figure 6 As shown, the method comprises the following steps:

[0116] Step 1: placing the exchange membrane 10 between two plastic frames stacked on each other;

[0117] That is, the exchange membrane 10 is clamped by the cathode frame 21 and the anode frame 22. Figure 4 As shown, the edges of the hollow parts of the cathode frame 21 and the anode frame 22 overlap with the four sides of the exchange membrane 10, ensuring that the exchange membrane 10 completely covers the hollow parts to isolate the hollow parts on both sides.

[0118] Step 2: Apply pressure to squeeze the two plastic frames against each other;

[0119] like Figure 4 As shown, the edges of the hollowed-out parts of the cathode frame 21 and the anode frame 22 are squeezed and fused with the periphery of the exchange membrane 10 to form a bonding area 110, so that they are in full contact and the gap is eliminated.

[0120] Step 3: Heat the plastic frame to at least partially soften it;

[0121] The softened plastic frame can be fully integrated with the edge of the exchange membrane 10 to make the two integrated.

[0122] Of course, in this step, heating and pressurizing can be performed simultaneously.

[0123] Step 4: Cooling to obtain a formed membrane electrode.

[0124] After the exchange membrane 10 is heated, pressurized and cooled, the exchange membrane 10 and the plastic frame are fused into a whole. At this time, the exchange membrane 10 is an integrated structure without any gaps. The grooves on both sides form an electrolysis chamber, which can withstand high-pressure impact and meet the hydrogen production needs under high-pressure environment.

[0125] In this embodiment, in the step of applying pressure to the plastic frame, the applied pressure is between 0.2 Mpa and 0.7 Mpa. The specific applied pressure may be determined according to the materials of the plastic frame and the exchange membrane 10 .

[0126] It is worth mentioning that in the above-mentioned step of heating the plastic frame to at least partially soften it, heating can be performed in any of the following ways:

[0127] The heated mold is directly contacted with the plastic frame for heating;

[0128] Coating a soldering agent on the surface of the plastic frame, and irradiating the surface of the plastic frame with a laser to heat it;

[0129] The plastic frame is locally heated by using ultrasonic waves.

[0130] The above three methods are hot pressing, laser welding and ultrasonic welding. All three methods can achieve the pressure resistance target value required by this patent. Generally, the pressure between 0.3Mpa and 0.5Mpa and the membrane electrode prepared by the above method can meet the demand of generating 35MPa pressure hydrogen.

[0131] In order to verify the specific temperature and pressure parameters required for the hot pressing of the plastic frame and the exchange membrane 10 to meet the requirement of generating 35MPa pressure hydrogen, the following materials for making membrane electrodes were tested in this embodiment, and the test data are as follows:

[0132]

[0133]

[0134] It can be seen from the experimental data that when the material of the membrane electrode is at least one of the following materials or a combination thereof: PEEK, PVDF, PCTFE, PFA, PPS, PEI and PPSU; in the step of applying pressure to the plastic frame, the applied pressure is 0.3Mpa;

[0135] When the material of the membrane electrode is at least one of the following materials or a combination thereof: PC, PP, PE, ABS, POM, and nylon; in the step of applying pressure to the plastic frame, the applied pressure is 0.5 MPa.

[0136] It can be seen from the experimental data that in this embodiment, in the step of heating the plastic frame, the heating target temperature of the plastic frame is between 120°C and 150°C.

[0137] In one embodiment, before the step of applying pressure to the plastic frame, the method further includes the following steps:

[0138] A guide protrusion is arranged on the mold so as to directly form an integrated guide groove on the surface of the plastic frame during the hot pressing process.

[0139] In the process of preparing the membrane electrode, a guide protrusion is provided on the mold, and a guide groove can be directly formed when the membrane electrode is hot-pressed, thereby avoiding the processing of the guide groove at a later stage and improving the processing efficiency.

[0140] Furthermore, before the step of applying pressure to the plastic frame, the following steps are also included:

[0141] A sealing line groove is arranged on the mold so as to directly form an integrated sealing line 40 on the surface of the plastic frame during the hot pressing process.

[0142] The "O"-shaped sealing line 40 of this embodiment can also be formed by hot pressing and integrally formed with the membrane electrode, so that the prepared membrane electrode itself has a sealing ring and can directly contact other sealing parts to achieve the sealing effect on the electrolysis chamber.

[0143] Of course, this embodiment is not limited to forming the sealing line 40 by hot pressing. The sealing line 40 can also be prepared by planing and milling after the membrane electrode is formed, or the sealing line 40 can be connected to the plastic frame by bonding. This embodiment does not impose a sole limitation on the shape of the sealing line 40.

[0144] Using the membrane electrode manufacturing method of this embodiment, two plastic frames are squeezed against each other and combined with the exchange membrane 10 by hot pressing. The plastic frames and the plastic frames and the exchange membrane 10 can be stably combined under the hot pressing molding process to form an integral component.

[0145] The membrane electrode is used in an electrolyzer device, avoiding the gap problem formed by various components when assembling the electrolyzer device and improving the sealing effect. The integrated membrane electrode increases the strength of the electrolyzer device, making it suitable for higher pressure environments and directly producing hydrogen at a pressure of 35MPa.

[0146] like Figure 7 As shown, the membrane electrode material obtained by the membrane electrode manufacturing method is integrated with the plastic frame plate and the exchange membrane 10 through an integrated hot pressing process, and the sealing line 40 formed by hot pressing the plastic frame is added. Compared with the traditional combined membrane electrode, its high pressure resistance is significantly improved. The membrane electrode obtained by the integrated hot pressing process of this embodiment breaks through the technical barriers formed by the assembly of multiple parts of the membrane electrode in the traditional technology, reduces the process of membrane electrode assembly and sealing, and improves the production efficiency of the membrane electrode, which is also a major breakthrough in the field of high-pressure hydrogen production.

[0147] Fourth embodiment

[0148] The fourth embodiment of the present application proposes a hot pressing mold for manufacturing the membrane electrode mentioned in the above embodiment, and the hot pressing mold is provided with:

[0149] A hot pressing tank, which can accommodate the membrane electrode, and the hot pressing tank is hollow to form an escape space to avoid the exchange membrane 10 to form a plastic frame;

[0150] The hot pressing column is arranged in the hot pressing groove corresponding to the guide hole to form the guide hole mentioned above during the hot pressing process. ;

[0151] The guide protrusion is arranged in the hot pressing groove, and the two sides of the guide protrusion are respectively connected to the hot pressing column and the avoidance space to form the guide groove as described above.

[0152] Furthermore, a sealing line groove is also provided on the hot pressing mold to form the above-mentioned sealing line 40 during the hot pressing process.

[0153] The hot pressing mold provided in this embodiment can form the membrane electrode mentioned in the above embodiment through an integrated hot pressing process. The prepared membrane electrode has good sealing performance and a compact structure, and can achieve hydrogen production at a pressure of 35MPa, effectively improving the hydrogen production efficiency.

[0154] Fifth embodiment

[0155] The fifth embodiment of the present application proposes a hot pressing molding device, on which the hot pressing mold mentioned in the above embodiment is arranged. Therefore, the hot pressing molding device also has all the advantages mentioned above, which will not be repeated here.

[0156] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0157] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A membrane electrode for ultra-high pressure water electrolysis to produce hydrogen, characterized in that: include: Exchange membrane; Two plastic frames are arranged on both sides of the exchange membrane, each of the plastic frames has a hollow portion, the exchange membrane covers the hollow portion and forms a chamber with the hollow portion, a guide groove and a guide hole connected to the guide groove are formed on the plastic frame, and two ends of the guide groove are connected to the guide hole and the chamber on one side of the exchange membrane; The diversion hole passes through the two plastic frames; The two plastic frames are integrally bonded and connected.

2. The membrane electrode for producing hydrogen by ultra-high pressure water electrolysis according to claim 1, characterized in that: Also includes: The material of the membrane electrode is at least one of the following materials or a combination thereof: PEEK; PVDF; PCTFE; PFA; PPS; PEI; PPSU; PC; PP; PE; ABS; POM; nylon.

3. The membrane electrode for producing hydrogen by ultra-high pressure water electrolysis according to claim 1, characterized in that: An integrated sealing line is arranged on the outer surface of the plastic frame, and the sealing line is used to form a sealing cavity together with an externally arranged sealing member.

4. An electrolytic cell device, characterized in that: The electrolytic cell is provided with a membrane electrode for producing hydrogen by ultra-high pressure water electrolysis as described in any one of claims 1 to 3.

5. A method for manufacturing a membrane electrode, characterized in that: The steps include: The exchange membrane is arranged between two plastic frames stacked on top of each other; Apply pressure to squeeze the two plastic frames against each other; heating the plastic frame to at least partially soften it; After cooling, a formed membrane electrode is obtained.

6. The method for manufacturing a membrane electrode according to claim 5, characterized in that: In the step of applying pressure to the plastic frame, the applied pressure is between 0.2 MPa and 0.7 MPa.

7. The method for manufacturing a membrane electrode according to claim 6, characterized in that: When the material of the membrane electrode is at least one of the following materials or a combination thereof: PEEK; PVDF; PCTFE; PFA; PPS; PEI; PPSU; In the step of applying pressure to the plastic frame, the applied pressure is 0.3 Mpa; When the material of the membrane electrode is at least one of the following materials or a combination thereof: PC; PP; PE; ABS; POM; nylon; In the step of applying pressure to the plastic frame, the applied pressure is 0.5 MPa.

8. The method for manufacturing a membrane electrode according to claim 5, characterized in that: In the step of heating the plastic frame, a heating target temperature of the plastic frame is between 120°C and 150°C.

9. The method for manufacturing a membrane electrode according to claim 5, characterized in that: Before the step of applying pressure to the plastic frame, the method further comprises: A guide protrusion is arranged on the mold so as to directly form an integrated guide groove on the surface of the plastic frame during the hot pressing process.

10. The method for manufacturing a membrane electrode according to claim 5, characterized in that: Before the step of applying pressure to the plastic frame, the method further comprises: A sealing line groove is arranged on the mold so as to directly form an integrated sealing line on the surface of the plastic frame during the hot pressing process.

11. The method for manufacturing a membrane electrode according to claim 5, characterized in that: In the step of heating the plastic frame to at least partially soften it, heating is performed in any one of the following ways: The heated mold is directly contacted with the plastic frame for heating; Coating a soldering agent on the surface of the plastic frame, and irradiating the surface of the plastic frame with a laser to heat it; The plastic frame is locally heated by using ultrasonic waves.

12. A hot pressing mold for manufacturing the membrane electrode according to any one of claims 1 to 3, characterized in that: The hot pressing mold is provided with: A hot pressing tank, the hot pressing tank can accommodate the membrane electrode, the hot pressing tank is hollow to form an escape space to avoid the exchange membrane; A hot pressing column, arranged in the hot pressing groove corresponding to the guide hole; A guide protrusion is arranged in the hot pressing groove, and two sides of the guide protrusion are respectively connected to the hot pressing column and the avoidance space.

13. The hot pressing mold according to claim 12, characterized in that: The hot pressing mold is also provided with a sealing wire groove.

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