Electrolytic water membrane electrode structure and electrolytic bath

Abstract

The utility model provides an electrolyzed water membrane electrode structure and an electrolytic bath. The electrolyzed water membrane electrode structure comprises a water electrolysis assembly and a frame assembly, the water electrolysis assembly comprises a catalyst coating film as well as an anode gas diffusion layer and a cathode gas diffusion layer which are arranged on two sides of the catalyst coating film; the frame assembly is arranged in the circumferential direction of the water electrolysis assembly, the frame assembly comprises a plurality of frame membranes which are arranged on the two sides of the catalyst coating membrane in a stacked mode, on the longitudinal section of the water electrolysis assembly, the inner edges of the frame membranes are aligned, and the outer edges of the frame membranes are aligned with the outer edges of proton exchange membranes in the catalyst coating membrane. According to the electrolytic water membrane electrode structure disclosed by the utility model, the frame membrane can be more fully packaged and attached after the proton exchange membrane is packaged, the air leakage risk is reduced, the production time and the production difficulty of a product can be reduced, and the stacking force of a whole stack can be effectively ensured for a long time by utilizing the characteristics of better sealing property and pressure resistance of the multi-layer frame membrane, so that the production efficiency is improved. The sealing performance is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic water hydrogen production, and particularly relates to an electrolytic water membrane electrode structure.

[0002] The utility model also relates to an electrolytic cell provided with the electrolytic water membrane electrode structure. Background Technique

[0003] The electrolytic water membrane electrode is the core component of the electrolytic cell. When the traditional electrolytic water membrane electrode is manufactured and encapsulated, since the proton exchange membrane of the electrolytic water membrane electrode is very thick, a border membrane usually needs to be arranged around the proton exchange membrane to eliminate the height difference. The height of this border membrane is the same as that of the catalyst coated membrane (abbreviated as CCM, which includes a proton exchange membrane and an anode catalyst layer and a cathode catalyst layer arranged on the upper and lower surfaces of the proton exchange membrane), so as to ensure that no air bubbles are left due to the excessive thickness of the catalyst coated membrane after border encapsulation.

[0004] However, for the above-mentioned sealing structure with a border membrane, although it can eliminate the edge height difference caused by the excessive thickness of the proton exchange membrane, the process design of this structure is complex during the manufacturing process, multiple alignments are required, the fitting accuracy is insufficient, and the manufacturing time is long. Moreover, in the traditional structure, using a relatively thick PTFE gasket to make up for the thickness of the anode gas diffusion layer and the cathode gas diffusion layer will pose a risk of air leakage in the electrolytic cell. This is because the PTFE gasket is an elastic membrane material, and after being compressed and deformed by the stacking force for a long time, there is a risk of elastic deformation failure of the PTFE gasket, resulting in seal failure and air leakage of the whole stack. Content of the Utility Model

[0005] In view of this, the utility model aims to propose an electrolytic water membrane electrode structure to improve the encapsulation effect of the electrolytic water membrane electrode and reduce the product manufacturing time and manufacturing difficulty.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] An electrolytic water membrane electrode structure includes a water electrolysis assembly and a border assembly;

[0008] The water electrolysis assembly includes a catalyst coated membrane, and an anode gas diffusion layer and a cathode gas diffusion layer arranged on both sides of the catalyst coated membrane;

[0009] The border assembly is arranged along the circumferential direction of the water electrolysis assembly, and the border assembly includes a plurality of border membranes respectively stacked on both sides of the catalyst coated membrane, and the outer edges of the border membranes are aligned with the outer edge of the proton exchange membrane in the catalyst coated membrane.

[0010] Further, the anode catalyst layer in the catalyst coated film has a first overlapping portion that overlaps and is connected to the frame assembly; and / or,

[0011] The cathode catalyst layer in the catalyst coated film has a second overlapping portion that overlaps and is connected to the frame assembly.

[0012] Further, in the longitudinal section of the water electrolysis assembly, the overlapping dimension L1 of the first overlapping portion satisfies: 0.1 mm ≤ L1 ≤ 0.3 mm, and / or, the overlapping dimension L2 of the second overlapping portion satisfies: 0.1 mm ≤ L2 ≤ 0.3 mm.

[0013] Further, the plurality of frame films include an anode frame film on one side of the catalyst coated film and a cathode frame film on the other side of the catalyst coated film; the anode frame film includes a first thin film substrate and a first adhesive layer provided on one side of the first thin film substrate, and / or, the cathode frame film includes a second thin film substrate and a second adhesive layer provided on one side of the second thin film substrate.

[0014] Further, the anode frame film close to the catalyst coated film is adhesively connected to the proton exchange membrane through the first adhesive layer; and / or,

[0015] The cathode frame film close to the catalyst coated film is adhesively connected to the proton exchange membrane through the second adhesive layer.

[0016] Further, the thickness of each anode frame film is different from the thickness of each cathode frame film.

[0017] Further, the frame assembly further includes an anode sealing gasket and a cathode sealing gasket. The anode sealing gasket is provided on the outside of the anode frame film, and the cathode sealing gasket is provided on the outside of the cathode frame film.

[0018] Further, the thickness d1 of the anode sealing gasket satisfies: 80 μm ≤ d1 ≤ 150 μm; and / or, the thickness d2 of the cathode sealing gasket satisfies: 80 μm ≤ d2 ≤ 150 μm.

[0019] Further, in the longitudinal section of the water electrolysis assembly, the inner edge of the anode sealing gasket is aligned with the inner edge of the cathode sealing gasket, and the outer edge of the anode sealing gasket is aligned with the outer edge of the cathode sealing gasket.

[0020] Compared with the prior art, the present utility model has the following advantages:

[0021] The electrolytic water membrane electrode structure described in the present utility model aligns the outer edges of the proton exchange membrane with the outer edges of each frame membrane, and a multi-layer frame membrane is used to form a stacked packaging structure. This can not only ensure that the proton exchange membrane will not cause insufficient bonding of the frame packaging due to height differences after packaging, eliminate the height differences between the anode gas diffusion layer and the cathode gas diffusion layer, and reduce the risk of air leakage, but also utilize the characteristics of the multi-layer frame membrane having good sealing performance and pressure resistance, as well as the strong adhesion between the frame membrane and the proton exchange membrane, so that the frame membrane will not fail due to elastic potential energy after long-term use, and can effectively ensure the stacking force of the entire stack for a long time and ensure the sealing performance.

[0022] At the same time, on the basis of aligning the outer edges of each frame membrane with the outer edges of the proton exchange membrane, the inner edges of each frame membrane are also aligned, that is, each frame membrane has the same size specification. In this way, when preparing the membrane electrode, only one frame fitting recognition device and process can be used to complete the sealing of the entire membrane electrode. This can reduce the difficulty of the frame packaging process, reduce the production time and production difficulty of the product, make the frame alignment accuracy higher, and is suitable for the early development stage and the later production stage.

[0023] In addition, the anode catalyst layer has a first overlapping portion that is overlapped and connected to the sealing frame assembly, which can ensure the area of the anode catalyst layer. The cathode catalyst layer has a second overlapping portion that is overlapped and connected to the sealing frame assembly, which can ensure the area of the cathode catalyst layer, thereby ensuring the size of the entire reaction zone. By limiting the overlapping size of the first overlapping portion and the overlapping size of the second overlapping portion, while ensuring the size of the entire reaction zone, it is beneficial to save the usage amounts of the anode catalyst and the cathode catalyst.

[0024] Secondly, the anode frame membrane and the cathode frame membrane are set to adopt a structure of a thin film substrate and an adhesive layer, which can reduce the production difficulty of the membrane electrode. At the same time, by utilizing the strong adhesion between the adhesive layer and the proton exchange membrane, the sealing performance of the packaging can be further ensured, and the risk of air leakage can be reduced. The anode frame membrane and the cathode frame membrane close to the catalyst coating membrane are respectively adhesively connected to the proton exchange membrane through the first adhesive layer and the second adhesive layer, which can facilitate the assembly of the frame membrane and the proton exchange membrane, and thus facilitate the preparation of the electrolytic water membrane electrode. By making the thicknesses of the anode frame membranes different from the thicknesses of the cathode frame membranes, the heights of the anode gas diffusion layer and the cathode gas diffusion layer can be better matched, which is beneficial to controlling the number of layers of the anode frame membrane and the cathode frame membrane, and further beneficial to reducing the production time and production difficulty of the membrane electrode.

[0025] Furthermore, on the basis of using multi-layer border films for encapsulation, an anode sealing gasket and a cathode sealing gasket are provided. Compared with the gasket thickness in the prior art, thinner anode sealing gaskets and cathode sealing gaskets can be used for sealed connection with the electrode plates. This can not only better ensure the sealing between the electrode plates and the border films, but also utilize the good pressure resistance of the multi-layer border films to ensure that the stacking force of the whole stack will not decrease due to the elastic deformation failure of the film material, thereby reducing the risk of air leakage in the whole stack. Limiting the thickness of the anode sealing gasket can balance the sealing between the anode border film and the electrode plate, as well as the number of layers of the anode border film. Limiting the thickness of the anode sealing gasket can balance the sealing between the cathode border film and the electrode plate, as well as the number of layers of the cathode border film.

[0026] In addition, the inner and outer edges of the cathode sealing gasket are respectively aligned with the inner and outer edges of the anode sealing gasket, so that the anode sealing gasket and the cathode sealing gasket have the same size, which is conducive to improving the versatility of the gasket and reducing the manufacturing difficulty of the membrane electrode.

[0027] Another object of the present invention is to provide an electrolytic cell, in which an electrolyzed water membrane electrode structure as described above is provided between two electrode plates.

[0028] For the electrolytic cell of the present invention, by adopting the above electrolyzed water membrane electrode structure, the encapsulation effect of the electrolyzed water membrane electrode can be improved, the product manufacturing time and manufacturing difficulty can be reduced, and the good sealing and pressure resistance of the multi-layer border films can be utilized to effectively ensure the stacking force of the whole stack for a long time, improve the sealing life of the electrolytic cell, and have a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a schematic structural diagram of the electrolyzed water membrane electrode structure according to an embodiment of the present invention;

[0031] Description of the reference numerals:

[0032] 1, catalyst coated membrane; 11, proton exchange membrane; 12, anode catalyst layer; 13, cathode catalyst layer; 2, anode gas diffusion layer; 3, cathode gas diffusion layer; 4, anode border film; 41, first thin film substrate; 42, first adhesive layer; 5, cathode border film; 51, second thin film substrate; 52, second adhesive layer; 6, anode sealing gasket; 7, cathode sealing gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0034] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0035] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood in combination with specific situations.

[0036] The electrolyzed water membrane electrode is the core component of the electrolytic cell. The single cell of the electrolytic cell mainly consists of a catalyst coated membrane CCM, a frame membrane, an anode gas diffusion layer, a sealing gasket, a cathode gas diffusion layer, and a bipolar plate. Among them, the catalyst coated membrane CCM is a three-layer membrane structure formed by coating and transferring the anode catalyst and the cathode catalyst on the upper and lower surfaces of the proton exchange membrane PEM. The frame membrane is a glue-coated thin film that plays a sealing and supporting role, the sealing gasket is an elastic PTFE film material without glue, and the bipolar plate is a conductive metal component.

[0037] When the traditional electrolyzed water membrane electrode is manufactured and encapsulated, since the proton exchange membrane of the electrolyzed water membrane electrode is very thick, it is usually necessary to set a circle of frame membranes around the proton exchange membrane to eliminate the height difference. The height of this frame membrane is the same as the height of the catalyst coated membrane to ensure that no bubbles are left due to the excessive thickness of the catalyst coated membrane after the frame is encapsulated.

[0038] However, for the above-mentioned sealing structure with a border film, although it can eliminate the edge height difference caused by the excessive thickness of the proton exchange membrane, the process of this structural design is complex during manufacturing. It requires multiple alignments, has insufficient fitting accuracy, and takes a long time to manufacture. Moreover, in the traditional electrolytic water membrane electrode structure, a border film is used to encapsulate the proton exchange membrane, an anode gas diffusion layer is assembled at the anode reaction zone position, a cathode gas diffusion layer is assembled at the cathode reaction zone position, and a relatively thick PTFE gasket is used to compensate for the thickness difference between the anode gas diffusion layer and the cathode gas diffusion layer. There is a risk of electrolytic cell air leakage because the PTFE gasket is an elastic membrane material. After being deformed under the stacking force for a long time, there is a risk of elastic deformation failure of the PTFE gasket, resulting in sealing failure and air leakage in the entire stack.

[0039] Therefore, aiming at the deficiencies in the existing technology, the present utility model proposes an electrolytic water membrane electrode structure. The following will describe the present utility model in detail with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Embodiment 1

[0041] This embodiment relates to an electrolytic water membrane electrode structure, which can improve the encapsulation effect of the electrolytic water membrane electrode and reduce the manufacturing time and difficulty.

[0042] In terms of the overall structure, as Figure 1 shown, the electrolytic water membrane electrode structure of this embodiment includes a water electrolysis component and a border component. Among them, the water electrolysis component includes a catalyst coated membrane 1, and an anode gas diffusion layer 2 and a cathode gas diffusion layer 3 provided on both sides of the catalyst coated membrane 1. The border component is arranged along the circumference of the water electrolysis component, and the border component includes a plurality of border films respectively stacked on both sides of the catalyst coated membrane 1. In the longitudinal section of the water electrolysis component, the inner edges of the border films are aligned, and the outer edges of the border films are aligned with the outer edge of the proton exchange membrane 11 in the catalyst coated membrane 1.

[0043] At this time, in the above structure, the outer edge of the proton exchange membrane 11 is aligned with the outer edges of the border films, and a multi-layer border film is stacked to form an encapsulation structure. This can ensure that the proton exchange membrane 11 will not cause insufficient border encapsulation fitting due to height difference after encapsulation, eliminate the height difference between the anode gas diffusion layer 2 and the cathode diffusion layer 3, reduce the air leakage risk, and the multi-layer border film has good sealing and pressure resistance characteristics. There is also a strong adhesive force between the border film and the proton exchange membrane 11. Therefore, the border film will not fail due to elastic potential energy after long-term use, but can effectively ensure the stacking force of the entire stack for a long time and ensure the sealing performance.

[0044] Meanwhile, on the basis that the outer edges of the respective border membranes are aligned with the outer edge of the proton exchange membrane 11, the inner edges of the respective border membranes are also aligned, that is, the respective border membranes adopt the same size specifications. In this way, when preparing the membrane electrode, only one border fitting recognition device and process can be used to complete the sealing of the entire membrane electrode. Thereby, the difficulty of the border packaging process can be reduced, and the production time and production difficulty of the product can be reduced, making the border alignment accuracy higher, which is suitable for the early development stage and the later production stage of the membrane electrode.

[0045] Specifically speaking, continue to refer to Figure 1 . In this embodiment, the anode gas diffusion layer 2 and the cathode gas diffusion layer 3 are respectively arranged on both sides of the catalyst coated membrane 1 and are in contact with the catalyst coated membrane 1. Specifically, the anode gas diffusion layer 2 is in contact with the anode catalyst layer 12 on the catalyst coated membrane 1, and the cathode gas diffusion layer 3 is in contact with the cathode catalyst layer 13 on the catalyst coated membrane 1.

[0046] As a preferred embodiment, still referring to Figure 1 shown, in this embodiment, the anode catalyst layer 12 in the catalyst coated membrane 1 has a first overlapping portion that overlaps and is connected to the border assembly, and moreover, the cathode catalyst layer 13 in the catalyst coated membrane 1 has a second overlapping portion that overlaps and is connected to the border assembly. At this time, the settings of the first overlapping portion and the second overlapping portion can respectively ensure the areas of the anode catalyst layer 12 and the cathode catalyst layer 13, thereby ensuring the size of the entire reaction area.

[0047] It should be noted that in addition to setting that the anode catalyst layer 12 and the cathode catalyst layer 13 respectively have the first overlapping portion and the second overlapping portion, it is also possible to only make the anode catalyst layer 12 have the first overlapping portion. At this time, the outer edge of the cathode catalyst layer 13 can be aligned with the inner edge of the border membrane. Or only make the cathode catalyst layer 13 have the second overlapping portion. At this time, the outer edge of the anode catalyst layer 12 can be aligned with the inner edge of the border membrane.

[0048] As a further preferred embodiment, in this embodiment, in the longitudinal section of the water electrolysis assembly, the overlapping dimension L1 of the first overlapping portion satisfies: 0.1 mm ≤ L1 ≤ 0.3 mm, and / or, the overlapping dimension L2 of the second overlapping portion satisfies: 0.1 mm ≤ L2 ≤ 0.3 mm. By limiting the overlapping dimensions of the first overlapping portion and the second overlapping portion, while ensuring the size of the entire reaction area, it is beneficial to save the usage amounts of the anode catalyst and the cathode catalyst.

[0049] In specific implementation, the overlapping dimension L1 of the first overlapping portion can be set, for example, to 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. The overlapping dimension L2 of the second overlapping portion can also be set, for example, to 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Among them, the overlapping dimension L1 of the first overlapping portion and the overlapping dimension L2 of the second overlapping portion can be set to the same value or different values.

[0050] In this embodiment, preferably, as Figure 1 shown, multiple frame films include an anode frame film 4 on one side of the catalyst coating film 1 and a cathode frame film 5 on the other side of the catalyst coating film 1. In the longitudinal section of the water electrolysis assembly, the inner edges of the anode frame films 4 are aligned with the inner edges of the cathode frame films 5, and the outer edges of the anode frame films 4 and the outer edges of the cathode frame films 5 are both aligned with the outer edge of the proton exchange membrane 11 in the catalyst coating film 1.

[0051] As a preferred implementation manner, the anode frame film 4 includes a first thin film substrate 41 and a first adhesive layer 42 provided on one side of the first thin film substrate 41, and the cathode frame film 5 includes a second thin film substrate 51 and a second adhesive layer 52 provided on one side of the second thin film substrate 51. At this time, the anode frame film 4 and the cathode frame film 5 adopt the structure of a thin film substrate and an adhesive layer, which can reduce the manufacturing difficulty of the membrane electrode.

[0052] Moreover, preferably, the anode frame film 4 close to the catalyst coating film 1 is adhesively connected to the proton exchange membrane 11 through the first adhesive layer 42, and the cathode frame film 5 close to the catalyst coating film 1 is adhesively connected to the proton exchange membrane 11 through the second adhesive layer 52. At this time, the anode frame film 4 and the cathode frame film 5 are adhesively connected to the proton exchange membrane 11 through the first adhesive layer 42 and the second adhesive layer 52 respectively, which is convenient for the assembly of the frame film and the proton exchange membrane 11, facilitates the preparation of the water electrolysis membrane electrode, and uses the characteristic of strong adhesion between the adhesive layer and the proton exchange membrane 11 to further ensure the sealing performance of the package and reduce the risk of air leakage.

[0053] It is worth mentioning here that, in addition to being adhesively connected to the proton exchange membrane 11 through the corresponding adhesive layers, the anode frame film 4 and the cathode frame film 5 near the catalyst coating film 1 can also be arranged such that only the anode frame film 4 near the catalyst coating film 1 is adhesively connected to the proton exchange membrane 11 through the first adhesive layer 41 inherent to the anode frame film 4. In this case, the cathode frame film 5 near the catalyst coating film 1 can be adhesively connected to the proton exchange membrane 11 by other means such as applying an adhesive layer. Of course, it is also possible to arrange such that only the cathode frame film 5 near the catalyst coating film 1 is adhesively connected to the proton exchange membrane 11 through the second adhesive layer 52 inherent to the cathode frame film 5. In this case, the anode frame film 4 near the catalyst coating film 1 can be adhesively connected to the proton exchange membrane 11 by other means such as applying an adhesive layer.

[0054] In this embodiment, the frame film adhesive layer (i.e., the first adhesive layer 42 or the second adhesive layer 52) is respectively laminated with the frame film substrate (i.e., the first thin film substrate 41 or the second thin film substrate 51) and the proton exchange membrane 11 under the same process conditions, and then made into a spline for acid boiling peeling test. After 500 hours of acid boiling, the peeling force between the frame film adhesive layer and the frame film substrate and the proton exchange membrane 11 is tested. It is found through testing that: the direct lamination effect between the frame film adhesive layer and the proton exchange membrane 11 is better, and no degumming occurs even when the proton exchange membrane 11 is torn, while degumming occurs between the frame film adhesive layer and the frame film substrate. Thus, it can be seen that the adhesion between the frame film adhesive layer and the proton exchange membrane 11 is stronger, that is, the adhesion ability between the adhesive layer and the proton exchange membrane 11 is stronger.

[0055] In this embodiment, there are two anode frame films 4 arranged in a laminated manner, and there are also two cathode frame films 5 arranged in a laminated manner. Adjacent anode frame films 4 are adhesively connected through the first adhesive layer 42 inherent to one of the anode frame films 4 and the first thin film substrate 41 of the other anode frame film 4, and adjacent cathode frame films 5 are adhesively connected through the second adhesive layer 52 inherent to one of the cathode frame films 5 and the second thin film substrate 52 of the other cathode frame film 5.

[0056] It is worth mentioning here that the number of laminated anode frame films 4 and cathode frame films 5 can be set accordingly according to actual needs. Additionally, it is also worth mentioning that in this embodiment, in addition to both the anode frame film 4 and the cathode frame film 5 adopting the structural form of a thin film substrate and an adhesive layer, it is also possible to arrange such that only the anode frame film 4 adopts the structural form of a thin film substrate and an adhesive layer, or only the cathode frame film 5 adopts the structural form of a thin film substrate and an adhesive layer.

[0057] In this embodiment, the thickness of each anode frame film 4 is different from that of each cathode frame film 5. Such a setting can better match the heights of the anode gas diffusion layer 2 and the cathode gas diffusion layer 3, thereby facilitating the control of the number of layers of the anode frame film 4 and the cathode frame film 5, and further facilitating the reduction of the manufacturing time and difficulty of the membrane electrode. As Figure 1 shown, preferably, the thickness of each cathode frame film 5 is greater than that of each anode frame film 4. Since the thickness of the cathode gas diffusion layer 3 is greater than that of the anode gas diffusion layer 2, by setting the thickness of the cathode frame film 5 to be greater than that of the anode frame at this time, the number of layers of the cathode frame film 5 can be reduced, which is beneficial to reducing the manufacturing time and difficulty of the membrane electrode.

[0058] On the basis of providing multiple layers of anode frame films 4 and multiple layers of cathode frame films 5, as a preferred embodiment, the frame assembly of this embodiment further includes an anode gasket 6 and a cathode gasket 7. The anode gasket 6 is specifically arranged outside the anode frame film 4, and the cathode gasket 7 is specifically arranged outside the cathode frame film 5. The thicknesses of the anode gasket 6 and the cathode gasket 7 in this structure can use thinner anode gasket 6 and cathode gasket 7 for sealing connection with the electrode plate compared with the gasket thicknesses in the prior art. In this way, not only can the sealing performance between the electrode plate and the frame film be better ensured, but also taking advantage of the good pressure resistance of the multiple layers of frame films, it can be ensured that the stacking force of the whole stack will not decrease due to the elastic deformation failure of the membrane material, thereby reducing the risk of air leakage in the whole stack.

[0059] As a further embodiment, in this embodiment, the thickness d1 of the anode gasket 6 satisfies: 80μm ≤ d1 ≤ 150μm, and the thickness d2 of the cathode gasket 7 satisfies: 80μm ≤ d2 ≤ 150μm. At this time, limiting the thickness of the anode gasket 6 can take into account the sealing performance between the anode frame film 4 and the electrode plate, as well as the number of layers of the anode frame film 4. Limiting the thickness of the anode gasket 6 can take into account the sealing performance between the cathode frame film 5 and the electrode plate, as well as the number of layers of the cathode frame film 5.

[0060] During specific implementation, the thickness d1 of the anode gasket 6 can be set, for example, to 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm or 150μm. The thickness d2 of the cathode gasket 7 can be set, for example, to 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm or 150μm. Among them, the thickness d1 of the anode gasket 6 and the thickness d2 of the cathode gasket 7 can be the same or different. Preferably, the thickness d1 of the anode gasket 6 is the same as the thickness d2 of the cathode gasket 7.

[0061] It should be noted that the positions and contour dimensions of the anode sealing gasket 6 and the cathode sealing gasket 7 on the frame assembly are specifically set according to the specific structure of the electrode plate. Additionally, it should also be noted that when preparing the electrolytic water membrane electrode, the overall thickness of the anode gas diffusion layer 2, the catalyst coated membrane 1, and the cathode gas diffusion layer 3 is the same as the overall thickness of the compressed anode sealing gasket 6, the anode frame membrane 4, the catalyst coated membrane, the cathode frame membrane 5, and the cathode sealing gasket 7. Furthermore, it should be noted that the anode sealing gasket 6 and the cathode sealing gasket 7 are preferably made of PTFE (abbreviation for Polytetrafluoroethylene).

[0062] In this embodiment, preferably, in the longitudinal section of the water electrolysis assembly, the inner edge of the anode sealing gasket 6 is aligned with the inner edge of the cathode sealing gasket 7, and the outer edge of the anode sealing gasket 6 is aligned with the outer edge of the cathode sealing gasket 7. Setting the inner and outer edges of the cathode sealing gasket 7 to be respectively aligned with the inner and outer edges of the anode sealing gasket 6 makes the sizes of the anode sealing gasket 6 and the cathode sealing gasket 7 the same, which is conducive to improving the versatility of the gasket and reducing the manufacturing difficulty of the membrane electrode.

[0063] For the structure of the electrolytic water membrane electrode in this embodiment, by expanding the area of the proton exchange membrane 11, the outer edge of the proton exchange membrane 11 is aligned with the outer edge of the frame membrane, that is, the outer contour dimension of the proton exchange membrane 11 is the same as the outer contour dimension of the frame membrane, and a multi-layer frame membrane is laminated to form a packaging structure. This can ensure full adhesion between the proton exchange membrane 11 and the frame membrane, eliminate the height difference on both sides of the proton exchange membrane 11, reduce the risk of air leakage, and the multi-layer frame membrane has good sealing and pressure resistance characteristics, as well as a strong adhesive force between the frame membrane and the proton exchange membrane 11, so that the frame membrane will not fail due to elastic potential energy after long-term use, thus effectively ensuring the stack force of the entire stack for a long time and ensuring the sealing performance.

[0064] At the same time, on the basis of aligning the outer edges of each frame membrane with the outer edge of the proton exchange membrane 11, the inner edges of each frame membrane are also aligned, that is, each frame membrane has the same size specification. In this way, when preparing the membrane electrode, only one type of frame fitting recognition device and process can be used to complete the sealing of the entire membrane electrode, resulting in lower process difficulty, shorter manufacturing time, and higher frame alignment accuracy.

[0065] In addition, in this embodiment, the height difference between the anode gas diffusion layer and the cathode gas diffusion layer is eliminated by stacking multiple layers of border membranes. This can eliminate the relatively thick PTFE gasket in the traditional packaging structure and only use a thinner PTFE gasket as the rubber strip between the bipolar plate and the border membrane material to play a sealing role. This structure can not only ensure the sealing between the bipolar plate and the border membrane, but also use the border membrane material with better pressure resistance to avoid the elastic deformation ability of the PTFE material failing due to the stacking pressure for a long time, which affects the stacking seal effect.

[0066] Embodiment 2

[0067] This embodiment relates to an electrolytic cell, and an electrolyzed water membrane electrode structure of Embodiment 1 is provided between two electrodes in the electrolytic cell.

[0068] Specifically, the electrolytic cell includes two relatively arranged electrodes, and the anode sealing gasket 6 and the cathode sealing gasket 7 in the electrolyzed water membrane electrode structure of Embodiment 1 are respectively adhesively connected to the two electrodes.

[0069] By adopting the electrolyzed water membrane electrode structure of Embodiment 1, the electrolytic cell of this embodiment can improve the packaging effect of the electrolyzed water membrane electrode, reduce the production time and production difficulty of the product, and use the multi-layer border membrane with good sealing performance and pressure resistance to effectively ensure the stacking force of the whole stack for a long time, improve the sealing life of the electrolytic cell, and have a good use effect.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrolyzed water membrane electrode structure, characterized in that: It includes a water electrolysis component and a frame component; The water electrolysis component includes a catalyst coated membrane (1), and an anode gas diffusion layer (2) and a cathode gas diffusion layer (3) arranged on both sides of the catalyst coated membrane (1); The frame component is arranged along the circumference of the water electrolysis component, and the frame component includes a plurality of frame membranes respectively stacked on both sides of the catalyst coated membrane (1). In the longitudinal section of the water electrolysis component, the inner edges of the frame membranes are aligned, and the outer edges of the frame membranes are aligned with the outer edge of the proton exchange membrane (11) in the catalyst coated membrane (1).

2. The electrolyzed water membrane electrode structure according to claim 1, characterized in that: The anode catalyst layer (12) in the catalyst coated membrane (1) has a first overlapping portion overlapping and connected with the frame component; and / or, The cathode catalyst layer (13) in the catalyst coated membrane (1) has a second overlapping portion overlapping and connected with the frame component.

3. The electrolyzed water membrane electrode structure according to claim 2, characterized in that: In the longitudinal section of the water electrolysis component, the overlapping dimension L1 of the first overlapping portion satisfies: 0.1 mm ≤ L1 ≤ 0.3 mm, and / or, the overlapping dimension L2 of the second overlapping portion satisfies: 0.1 mm ≤ L2 ≤ 0.3 mm.

4. The electrolyzed water membrane electrode structure according to any one of claims 1 to 3, characterized in that: The plurality of frame membranes include an anode frame membrane (4) located on one side of the catalyst coated membrane (1), and a cathode frame membrane (5) located on the other side of the catalyst coated membrane (1); The anode frame membrane (4) includes a first thin film substrate (41) and a first adhesive layer (42) arranged on one side of the first thin film substrate (41), and / or, the cathode frame membrane (5) includes a second thin film substrate (51) and a second adhesive layer (52) arranged on one side of the second thin film substrate (51).

5. The electrolyzed water membrane electrode structure according to claim 4, characterized in that: The anode frame membrane (4) close to the catalyst coated membrane (1) is adhesively connected to the proton exchange membrane (11) through the first adhesive layer (42); and / or, The cathode frame membrane (5) close to the catalyst coated membrane (1) is adhesively connected to the proton exchange membrane (11) through the second adhesive layer (52).

6. The electrolyzed water membrane electrode structure according to claim 4, characterized in that: The thickness of each anode frame membrane (4) is different from the thickness of each cathode frame membrane (5).

7. The electrolyzed water membrane electrode structure according to claim 4, characterized in that: The frame component further includes an anode sealing gasket (6) and a cathode sealing gasket (7). The anode sealing gasket (6) is arranged outside the anode frame membrane (4), and the cathode sealing gasket (7) is arranged outside the cathode frame membrane (5).

8. The electrolyzed water membrane electrode structure according to claim 7, characterized in that: The thickness d1 of the anode sealing gasket (6) satisfies: 80 μm ≤ d1 ≤ 150 μm; and / or, The thickness d2 of the cathode sealing gasket (7) satisfies: 80 μm ≤ d2 ≤ 150 μm.

9. The electrolytic water membrane electrode structure according to claim 7, wherein: On the longitudinal section of the water electrolysis assembly, the inner edges of the anode sealing gasket (6) and the cathode sealing gasket (7) are aligned, and the outer edges of the anode sealing gasket (6) and the cathode sealing gasket (7) are aligned.

10. An electrolytic cell, wherein: An electrolytic water membrane electrode structure according to any one of claims 1 to 9 is provided between two plates in the electrolytic cell.

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