Membrane electrode assembly and electrolytic bath

Abstract

The invention provides a membrane electrode assembly and an electrolytic bath, the membrane electrode assembly is arranged between an anode bipolar plate and a cathode bipolar plate of the electrolytic bath, and the membrane electrode assembly comprises an anode frame, a proton exchange membrane and a cathode frame; two ends of the anode frame are respectively provided with an anode cavity opening, and one surface, close to the proton exchange membrane, of the anode frame is provided with a first sealing strip surrounding the anode cavity opening; two ends of the cathode frame are respectively provided with a cathode cavity opening; one surface, close to the proton exchange membrane, of the cathode frame is provided with a second sealing strip surrounding the cathode cavity opening; the vertical projections of the anode cavity opening and the cathode cavity opening on the plane where the proton exchange membrane is located coincide, and the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not coincide and intersect. Compared with bonding through plane glue, the contact area of the first sealing strip and the proton exchange membrane and the contact area of the second sealing strip and the proton exchange membrane are small, large contact stress can be generated through small assembling force, and the sealing performance of the membrane electrode assembly is guaranteed.

Description

Technical Field

[0001] The present application belongs to the technical field of water electrolysis, and specifically relates to a membrane electrode assembly and an electrolytic cell. Background Art

[0002] In the art, an electrolyzer is usually used to electrolyze water to obtain hydrogen. A bipolar plate structure is usually provided in the electrolyzer. The bipolar plate structure usually includes a plurality of identical bipolar plates arranged alternately, and a membrane electrode assembly (MEA) is arranged between every two bipolar plates.

[0003] However, the multilayer structure in the current membrane electrode assembly is bonded by designing a flat adhesive on the contact area. However, the area of ​​the flat adhesive is large, usually accounting for about 25% of the entire membrane electrode assembly area, so a large assembly force is required to ensure the contact stress and thus ensure the sealing reliability. Moreover, in practice, due to the uneven thickness of some components in the membrane electrode assembly, the contact stress of the flat adhesive at different positions will be different. In places where the contact stress in the flat adhesive is small, with the occurrence of stress relaxation and permanent compression deformation, the interface leakage continues to increase, resulting in different degrees of external leakage and internal leakage problems in the membrane electrode assembly. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, a membrane electrode assembly and an electrolyzer are proposed. By using such a membrane electrode assembly and an electrolyzer, the probability of different degrees of external leakage and internal leakage of the membrane electrode assembly can be reduced.

[0005] This application provides the following solution.

[0006] In a first aspect, the present application provides a membrane electrode assembly, the membrane electrode assembly is arranged between an anode bipolar plate and a cathode bipolar plate of an electrolyzer, the membrane electrode assembly comprising: an anode frame, a proton exchange membrane and a cathode frame;

[0007] Anode cavity openings are respectively arranged at both ends of the anode frame, and a first sealing strip surrounding the anode cavity opening is arranged on one side of the anode frame close to the proton exchange membrane;

[0008] Both ends of the cathode frame are respectively provided with cathode cavity openings, and a second sealing strip surrounding the cathode cavity opening is provided on one side of the cathode frame close to the proton exchange membrane;

[0009] The vertical projections of the anode cavity opening and the cathode cavity opening on the plane where the proton exchange membrane is located overlap, and the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect.

[0010] In some possible embodiments, the first sealing strip is at a first distance from the edge of the anode cavity opening, and the second sealing strip is at a second distance from the edge of the cathode cavity opening;

[0011] The absolute value of the difference between the first distance and the second distance is greater than or equal to the width of the first sealing strip;

[0012] An absolute value of a difference between the first distance and the second distance is greater than or equal to a width of the second sealing strip.

[0013] In some possible embodiments, the first distance is greater than the second distance;

[0014] The difference between the first distance and the second distance is greater than or equal to the width of the second sealing strip.

[0015] In some possible embodiments, the first distance is smaller than the second distance;

[0016] The difference between the second distance and the first distance is greater than or equal to the width of the first sealing strip.

[0017] In some possible embodiments, the anode frame includes an anode cavity opening and an anode reaction zone cavity;

[0018] A third sealing strip is provided on the edge of one side of the anode frame close to the proton exchange membrane;

[0019] The cathode frame includes a cathode cavity opening and a cathode reaction zone cavity;

[0020] A fourth sealing strip is arranged on the edge of one side of the cathode frame close to the proton exchange membrane.

[0021] In some possible embodiments, vertical projections of the third sealing strip and the fourth sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect;

[0022] The fourth sealing strip is arranged inside or outside the third sealing strip.

[0023] In some possible embodiments, the anode cavity port includes a first hydrogen outlet, a second hydrogen outlet, an anode water inlet, and an anode water outlet;

[0024] The cathode cavity port includes a third hydrogen outlet, a fourth hydrogen outlet, a cathode water inlet and a cathode water outlet;

[0025] The vertical projections of the first hydrogen outlet and the third hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other;

[0026] The vertical projections of the second hydrogen outlet and the fourth hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other;

[0027] The vertical projections of the anode water inlet and the cathode water inlet on the plane where the proton exchange membrane is located coincide with each other;

[0028] The vertical projections of the anode water outlet and the cathode water outlet on the plane where the proton exchange membrane is located coincide with each other.

[0029] In some possible embodiments, the first hydrogen outlet, the second hydrogen outlet, the anode water inlet and the anode water outlet are all surrounded by a first sealing strip;

[0030] The third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet and the cathode water outlet are all surrounded by a second sealing strip.

[0031] In some possible embodiments, the edge of the first hydrogen outlet, the second hydrogen outlet, the anode water inlet, or the anode water outlet is a first distance away from the first sealing strip;

[0032] The edge of the third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet or the cathode water outlet is a second distance away from the second sealing strip.

[0033] In a second aspect, the present application provides an electrolytic cell, the electrolytic cell comprising an anode bipolar plate, a cathode bipolar plate and a membrane electrode assembly disposed between the anode bipolar plate and the cathode bipolar plate, the membrane electrode assembly comprising: an anode frame, a proton exchange membrane and a cathode frame;

[0034] Anode cavity openings are respectively arranged at both ends of the anode frame, and a first sealing strip surrounding the anode cavity opening is arranged on one side of the anode frame close to the proton exchange membrane;

[0035] Both ends of the cathode frame are respectively provided with cathode cavity openings, and a second sealing strip surrounding the cathode cavity opening is provided on one side of the cathode frame close to the proton exchange membrane;

[0036] The vertical projections of the anode cavity opening and the cathode cavity opening on the plane where the proton exchange membrane is located overlap, and the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect.

[0037] In some possible embodiments, the first sealing strip is at a first distance from the edge of the anode cavity opening, and the second sealing strip is at a second distance from the edge of the cathode cavity opening;

[0038] The absolute value of the difference between the first distance and the second distance is greater than or equal to the width of the first sealing strip;

[0039] An absolute value of a difference between the first distance and the second distance is greater than or equal to a width of the second sealing strip.

[0040] In some possible embodiments, the first distance is greater than the second distance;

[0041] The difference between the first distance and the second distance is greater than or equal to the width of the second sealing strip.

[0042] In some possible embodiments, the first distance is smaller than the second distance;

[0043] The difference between the second distance and the first distance is greater than or equal to the width of the first sealing strip.

[0044] In some possible embodiments, the anode frame includes an anode cavity opening and an anode reaction zone cavity;

[0045] A third sealing strip is provided on the edge of one side of the anode frame close to the proton exchange membrane;

[0046] The cathode frame includes a cathode cavity opening and a cathode reaction zone cavity;

[0047] A fourth sealing strip is arranged on the edge of one side of the cathode frame close to the proton exchange membrane.

[0048] In some possible embodiments, vertical projections of the third sealing strip and the fourth sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect;

[0049] The fourth sealing strip is arranged inside or outside the third sealing strip.

[0050] In some possible embodiments, the anode cavity port includes a first hydrogen outlet, a second hydrogen outlet, an anode water inlet, and an anode water outlet;

[0051] The cathode cavity port includes a third hydrogen outlet, a fourth hydrogen outlet, a cathode water inlet and a cathode water outlet;

[0052] The vertical projections of the first hydrogen outlet and the third hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other;

[0053] The vertical projections of the second hydrogen outlet and the fourth hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other;

[0054] The vertical projections of the anode water inlet and the cathode water inlet on the plane where the proton exchange membrane is located coincide with each other;

[0055] The vertical projections of the anode water outlet and the cathode water outlet on the plane where the proton exchange membrane is located coincide with each other.

[0056] In some possible embodiments, the first hydrogen outlet, the second hydrogen outlet, the anode water inlet and the anode water outlet are all surrounded by a first sealing strip;

[0057] The third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet and the cathode water outlet are all surrounded by a second sealing strip.

[0058] In some possible embodiments, the edge of the first hydrogen outlet, the second hydrogen outlet, the anode water inlet, or the anode water outlet is a first distance away from the first sealing strip;

[0059] The edge of the third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet or the cathode water outlet is a second distance away from the second sealing strip.

[0060] The membrane electrode assembly provided in the embodiment of the present application is provided with a first sealing strip around the anode cavity on the anode frame in the membrane electrode assembly, and a second sealing strip around the cathode cavity on the cathode frame, and the first sealing strip and the second sealing strip can ensure the sealing of the membrane electrode assembly. It can be seen that compared with bonding by flat adhesive, the contact area between the first sealing strip and the second sealing strip in the present application and the proton exchange membrane is smaller, and a larger contact stress can be generated by a smaller assembly force to ensure the sealing of the membrane electrode assembly. Moreover, the thickness of the first sealing strip and the second sealing strip is highly controllable, and the contact stress of the first sealing strip and the second sealing strip is less affected by the uneven thickness of some components in the membrane electrode assembly, and it is not easy to have external leakage and internal leakage problems.

[0061] Other advantages of the present application will be explained in more detail with reference to the following description and drawings.

[0062] It should be understood that the above description is only an overview of the technical solution of the present application, so that the technical means of the present application can be more clearly understood and implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are specifically described below by way of example. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The advantages and benefits described herein and other advantages and benefits will be apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only used for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0064] Figure 1 A schematic diagram of a membrane electrode assembly provided in an embodiment of the present application;

[0065] Figure 2 A cross-sectional view of a membrane electrode assembly provided in an embodiment of the present application;

[0066] Figure 3 A schematic diagram of an anode frame provided in an embodiment of the present application;

[0067] Figure 4 A schematic diagram of a cathode frame provided in an embodiment of the present application;

[0068] Figure 5 A schematic diagram of another anode frame provided in an embodiment of the present application;

[0069] Figure 6 A schematic diagram of another cathode frame provided in an embodiment of the present application;

[0070] Figure 7A schematic diagram of an electrolytic cell provided in an embodiment of the present application.

[0071] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0072] Proton exchange membrane 101; anode frame 102; anode bottom plate 201; first sealing strip 202; third sealing strip 203; anode reaction zone cavity 204; anode cavity opening 205; first hydrogen outlet 225; second hydrogen outlet 235; anode water inlet 215; anode water outlet 245; cathode frame 103; cathode bottom plate 301; second sealing strip 302; fourth sealing strip 303; cathode reaction zone cavity 304; cathode cavity opening 305; third hydrogen outlet 325; fourth hydrogen outlet 335; cathode water inlet 315; cathode water outlet 345; first distance D1; second distance D2; anode bipolar plate 1000; membrane electrode assembly 2000; cathode bipolar plate 3000.

[0073] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0074] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0075] In the description of the embodiments of the present application, it should be understood that terms such as "including" or "having" are intended to indicate the presence of disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof in this specification, and do not exclude the possibility of the presence of one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof. The terms "first", "second", etc. are used only for the convenience of description to distinguish the same or similar technical features, and cannot be understood as indicating or implying the relative importance or quantity of these technical features. Thus, the features defined by "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the term "plurality" means two or more than two.

[0076] Unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. For the convenience of description, spatial relationship words such as “under”, “below”, “above”, “on”, etc. may be used here to describe the relationship between one element or feature shown in the drawings and other elements or features. It will be understood that these spatial relationship words are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings.

[0077] It should also be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0078] See also Figure 1 , which is a schematic diagram of a membrane electrode assembly provided in an embodiment of the present application.

[0079] The membrane electrode assembly in the embodiment of the present application is arranged between the anode bipolar plate and the cathode bipolar plate of the electrolytic cell. Figure 1 and Figure 2 As shown, the membrane electrode assembly provided in the embodiment of the present application includes: an anode frame 102, a proton exchange membrane 101 and a cathode frame 103;

[0080] Anode openings 205 are respectively provided at both ends of the anode frame 102, and a first sealing strip 202 ( Figure 1 not shown in the figure);

[0081] Cathode openings 305 are respectively provided at both ends of the cathode frame 102, and a second sealing strip 302 surrounding the cathode opening 305 is provided on one side of the cathode frame 102 close to the proton exchange membrane 101;

[0082] The vertical projections of the anode cavity opening 205 and the cathode cavity opening 305 on the plane where the proton exchange membrane 101 is located overlap, and the vertical projections of the first sealing strip 202 and the second sealing strip 302 on the plane where the proton exchange membrane 101 is located do not overlap and do not intersect.

[0083] In the embodiment of the present application, compared with bonding by flat adhesive, the contact area between the first sealing strip and the second sealing strip in the present application and the proton exchange membrane is smaller, and a larger contact stress can be generated by a smaller assembly force to ensure the sealing of the membrane electrode assembly. In addition, the thickness of the first sealing strip and the second sealing strip is highly controllable, and the contact stress of the first sealing strip and the second sealing strip is less affected by the uneven thickness of some components in the membrane electrode assembly, and it is not easy to have external leakage and internal leakage problems.

[0084] It should be noted that in the embodiment of the present application, the anode cavity opening and the cathode cavity opening overlap in the thickness direction of the membrane electrode assembly, but the positions of the sealing strips surrounding the anode cavity opening and the cathode cavity opening are different. Figure 2 As shown in the cross-sectional view of the membrane electrode assembly in FIG, the first sealing strip 202 and the second sealing strip 302 do not overlap in the thickness direction of the membrane electrode assembly. The first sealing strip 202 and the second sealing strip 302 do not overlap in the thickness direction of the membrane electrode assembly, which means that the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap, and the first sealing strip and the second sealing strip do not intersect in the thickness direction of the membrane electrode assembly.

[0085] First, the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap, and the thickness of the first sealing strip and the second sealing strip set in the membrane electrode assembly is relatively thin. On the one hand, the asymmetric shear stress applied to the proton exchange membrane is small, which will not have a significant impact on the proton exchange membrane. On the other hand, the sealing strip and the second sealing strip are in contact with the proton exchange membrane at different locations, so that the contact stress on the proton exchange membrane is relatively uniform, preventing the proton exchange membrane from being damaged by excessive stress. Secondly, the first sealing strip and the second sealing strip do not intersect in the thickness direction of the membrane electrode assembly, which can prevent the first sealing strip and the second sealing strip from stacking, causing excessive contact stress on some sealing strips, resulting in excessive compression of the sealing strips and damage to the proton exchange membrane.

[0086] The following will be Figure 3 and Figure 4 The anode frame and the cathode frame in the embodiment of the present application are specifically introduced.

[0087] like Figure 3 As shown in the anode frame in the embodiment of the present application, the anode frame includes an anode bottom plate 201, an anode cavity 205, a first sealing strip 202 and a third sealing strip 203. Figure 4 As shown in the cathode frame in FIG. 3 , the cathode frame includes a cathode bottom plate 301, a cathode cavity 305, a second sealing strip 302 and a fourth sealing strip 303. The first sealing strip 202 is a first distance D1 from the edge of the anode cavity 205. The second sealing strip 302 is a second distance D2 from the edge of the cathode cavity.

[0088] It should be noted that in the embodiment of the present application, the absolute value of the difference between the first distance D1 and the second distance D2 is greater than or equal to the width of the first sealing strip 202 or the second sealing strip 302, so as to ensure that the first sealing strip 202 and the second sealing strip 302 do not overlap at all in the thickness direction of the membrane electrode assembly, that is, the vertical projections of the first sealing strip 202 and the second sealing strip 302 on the plane where the proton exchange membrane 101 is located do not overlap and do not intersect. As a possible implementation method, when the first distance D1 is greater than the second distance D2, the difference between the first distance D1 and the second distance D2 is greater than or equal to the width of the second sealing strip 302. As another possible implementation method, when the first distance D1 is less than the second distance D2, the difference between the second distance D2 and the first distance D1 is greater than or equal to the width of the first sealing strip 202.

[0089] In practical applications, such as Figure 5 As shown, the anode cavity 205 provided in the embodiment of the present application may include a first hydrogen outlet 225, a second hydrogen outlet 235, an anode water inlet 215 and an anode water outlet 245. Figure 6 As shown, the cathode cavity 305 includes a third hydrogen outlet 325, a fourth hydrogen outlet 335, a cathode water inlet 315 and a cathode water outlet 345. The vertical projections of the first hydrogen outlet 225 and the third hydrogen outlet 325 on the plane where the proton exchange membrane 101 is located coincide with each other; the vertical projections of the second hydrogen outlet 235 and the fourth hydrogen outlet 335 on the plane where the proton exchange membrane is located coincide with each other; the vertical projections of the anode water inlet 215 and the cathode water inlet 315 on the plane where the proton exchange membrane 101 is located coincide with each other; and the vertical projections of the anode water outlet 245 and the cathode water outlet 345 on the plane where the proton exchange membrane 101 is located coincide with each other.

[0090] In the embodiment of the present application, the first hydrogen outlet 225, the second hydrogen outlet 235, the anode water inlet 215 and the anode water outlet 245 are surrounded by the first sealing strip 202. Moreover, the edges of the first hydrogen outlet 225, the second hydrogen outlet 235, the anode water inlet 215 and the anode water outlet 245 are a first distance D1 from the first sealing strip 202. The third hydrogen outlet 325, the fourth hydrogen outlet 335, the cathode water inlet 315 and the cathode water outlet 345 are surrounded by the second sealing strip 302. The edges of the third hydrogen outlet 325, the fourth hydrogen outlet 335, the cathode water inlet 315 and the cathode water outlet 345 are a second distance D2 from the second sealing strip 302.

[0091] The first sealing strip 202 in the embodiment of the present application can ensure that the anode cavities are independent of each other, thereby preventing the fluid in the anode cavity from leaking. The second sealing strip 302 can ensure that the cathode cavities are independent of each other, thereby preventing the fluid in the cathode cavity from leaking.

[0092] In the embodiment of the present application, the anode frame includes an anode cavity 205 and an anode reaction zone cavity 204; a third sealing strip 203 is provided at the edge of the anode frame 102 close to the proton exchange membrane 101. The cathode frame 103 includes a cathode cavity 305 and a cathode reaction zone cavity 304; a fourth sealing strip 303 is provided at the edge of the cathode frame 103 close to the proton exchange membrane 101. The third sealing strip 203 and the fourth sealing strip 303 can ensure that the interior of the anode frame and the cathode frame are isolated from the external environment, thereby preventing the liquid in the reaction zone from leaking out.

[0093] It should be noted that in the embodiment of the present application, the vertical projections of the third sealing strip 203 and the fourth sealing strip 303 on the plane where the proton exchange membrane 101 is located do not overlap and do not intersect. In actual applications, the fourth sealing strip 303 is arranged on the inside or outside of the third sealing strip 203, and the embodiment of the present application is not limited here. The principle that the vertical projections of the third sealing strip 203 and the fourth sealing strip 303 on the plane where the proton exchange membrane 101 is located do not overlap and do not intersect in the embodiment of the present application is similar to the principle that the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect, and the embodiment of the present application will not be repeated here.

[0094] In summary, compared with bonding through flat glue, the contact area between the first sealing strip and the second sealing strip in the present application and the proton exchange membrane is smaller, and a larger contact stress can be generated through a smaller assembly force to ensure the sealing of the membrane electrode assembly. Moreover, the thickness of the first sealing strip and the second sealing strip is highly controllable, and the contact stress of the first sealing strip and the second sealing strip is less affected by the uneven thickness of some components in the membrane electrode assembly, and it is not easy to have external leakage and internal leakage problems. The vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap, so that the contact stress of the proton exchange membrane is relatively uniform, preventing the proton exchange membrane from being damaged by excessive stress. The first sealing strip and the second sealing strip do not intersect in the thickness direction of the membrane electrode assembly, which can prevent the first sealing strip and the second sealing strip from stacking, causing the sealing strip to be over-compressed and damage the proton exchange membrane.

[0095] According to the membrane electrode assembly provided in the above embodiment, the embodiment of the present application also provides an electrolytic cell.

[0096] like Figure 7 As shown, the electrolytic cell provided in the embodiment of the present application includes an anode bipolar plate 1000, a cathode bipolar plate 3000 and a membrane electrode assembly 2000 disposed between the anode bipolar plate 1000 and the cathode bipolar plate 3000, and the membrane electrode assembly 2000 includes: an anode frame, a proton exchange membrane and a cathode frame;

[0097] Anode cavity openings are respectively arranged at both ends of the anode frame, and a first sealing strip surrounding the anode cavity opening is arranged on one side of the anode frame close to the proton exchange membrane;

[0098] Both ends of the cathode frame are respectively provided with cathode cavity openings, and a second sealing strip surrounding the cathode cavity opening is provided on one side of the cathode frame close to the proton exchange membrane;

[0099] The vertical projections of the anode cavity opening and the cathode cavity opening on the plane where the proton exchange membrane is located overlap, and the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect.

[0100] As a possible implementation, the first sealing strip is at a first distance from the edge of the anode cavity opening, and the second sealing strip is at a second distance from the edge of the cathode cavity opening; the absolute value of the difference between the first distance and the second distance is greater than or equal to the width of the first sealing strip, and the absolute value of the difference between the first distance and the second distance is greater than or equal to the width of the second sealing strip.

[0101] As a possible implementation, the first distance is greater than the second distance; and the difference between the first distance and the second distance is greater than or equal to the width of the second sealing strip.

[0102] As a possible implementation, the first distance is smaller than the second distance; and the difference between the second distance and the first distance is greater than or equal to the width of the first sealing strip.

[0103] As a possible implementation mode, the anode frame includes an anode cavity opening and an anode reaction zone cavity; a third sealing strip is provided on an edge of the anode frame close to the proton exchange membrane; the cathode frame includes a cathode cavity opening and a cathode reaction zone cavity; a fourth sealing strip is provided on an edge of the cathode frame close to the proton exchange membrane.

[0104] As a possible implementation, the vertical projections of the third sealing strip and the fourth sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect; the fourth sealing strip is arranged on the inner side or the outer side of the third sealing strip.

[0105] As a possible implementation manner, the anode cavity port includes a first hydrogen outlet, a second hydrogen outlet, an anode water inlet and an anode water outlet; the cathode cavity port includes a third hydrogen outlet, a fourth hydrogen outlet, a cathode water inlet and a cathode water outlet; the vertical projections of the first hydrogen outlet and the third hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other; the vertical projections of the second hydrogen outlet and the fourth hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other; the vertical projections of the anode water inlet and the cathode water inlet on the plane where the proton exchange membrane is located coincide with each other; the vertical projections of the anode water outlet and the cathode water outlet on the plane where the proton exchange membrane is located coincide with each other.

[0106] As a possible implementation, the first hydrogen outlet, the second hydrogen outlet, the anode water inlet and the anode water outlet are all surrounded by a first sealing strip; the third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet and the cathode water outlet are all surrounded by a second sealing strip.

[0107] As a possible implementation, the edge of the first hydrogen outlet, the second hydrogen outlet, the anode water inlet or the anode water outlet is a first distance away from the first sealing strip;

[0108] The edge of the third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet or the cathode water outlet is a second distance away from the second sealing strip.

[0109] It should be noted that the electrolytic cell in the embodiment of the present application may include the various components of the aforementioned membrane electrode assembly embodiment and achieve the same effects and functions, which will not be repeated here.

[0110] Although the illustrative embodiments of the present application have been described and illustrated in detail in the drawings and the foregoing description, they should be considered illustrative rather than restrictive, and it should be understood that only certain exemplary embodiments have been shown and described and that all changes and modifications within the spirit of the claimed invention are intended to be protected. It should be understood that although the use of words such as preferred, preferred, preferred or more preferred in the above description indicates that the features described in this way may be more ideal, it may not be necessary and implementations without these features may be conceivable within the scope of the present invention, which scope is defined by the appended claims. When reading the claims, when words such as "one", "an", "at least one" or "at least one portion" are used, it is not intended to limit the claim to only one item, unless a contrary statement is specifically stated in the claim. When the language "at least a portion" and / or "a portion" is used, the item may include a portion and / or the entire item unless there is a specific statement to the contrary.

[0111] Although the spirit and principle of the present application have been described above with reference to several specific embodiments, it should be understood that the present application is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined. The present application is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the attached claims.

Claims

1. A membrane electrode assembly, characterized in that: The membrane electrode assembly is arranged between the anode bipolar plate and the cathode bipolar plate of the electrolyzer, and the membrane electrode assembly comprises: an anode frame, a proton exchange membrane and a cathode frame; Anode cavity openings are respectively arranged at both ends of the anode frame, and a first sealing strip surrounding the anode cavity opening is arranged on one side of the anode frame close to the proton exchange membrane; Both ends of the cathode frame are respectively provided with cathode cavity openings, and a second sealing strip surrounding the cathode cavity opening is provided on a side of the cathode frame close to the proton exchange membrane; The vertical projections of the anode cavity opening and the cathode cavity opening on the plane where the proton exchange membrane is located overlap, and the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect.

2. The membrane electrode assembly according to claim 1, characterized in that: The first sealing strip is at a first distance from the edge of the anode cavity opening, and the second sealing strip is at a second distance from the edge of the cathode cavity opening; The absolute value of the difference between the first distance and the second distance is greater than or equal to the first sealing strip width; An absolute value of a difference between the first distance and the second distance is greater than or equal to a width of the second sealing strip.

3. The membrane electrode assembly according to claim 2, characterized in that: The first distance is greater than the second distance; A difference between the first distance and the second distance is greater than or equal to a width of the second sealing strip.

4. The membrane electrode assembly according to claim 2, characterized in that: The first distance is smaller than the second distance; A difference between the second distance and the first distance is greater than or equal to a width of the first sealing strip.

5. The membrane electrode assembly according to claim 1, characterized in that: The anode frame includes an anode cavity opening and an anode reaction zone cavity; A third sealing strip is provided on an edge of one side of the anode frame close to the proton exchange membrane; The cathode frame includes a cathode cavity opening and a cathode reaction zone cavity; A fourth sealing strip is arranged on an edge of one side of the cathode frame close to the proton exchange membrane.

6. The membrane electrode assembly according to claim 5, characterized in that: The vertical projections of the third sealing strip and the fourth sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect; The fourth sealing strip is arranged inside or outside the third sealing strip.

7. The membrane electrode assembly according to claim 1, characterized in that: The anode cavity port comprises a first hydrogen outlet, a second hydrogen outlet, an anode water inlet and an anode water outlet; The cathode cavity port comprises a third hydrogen outlet, a fourth hydrogen outlet, a cathode water inlet and a cathode water outlet; The vertical projections of the first hydrogen outlet and the third hydrogen outlet on the plane where the proton exchange membrane is located coincide with each other; The second hydrogen outlet and the fourth hydrogen outlet have vertical projections coincident with each other on the plane where the proton exchange membrane is located; The vertical projections of the anode water inlet and the cathode water inlet on the plane where the proton exchange membrane is located coincide with each other; The vertical projections of the anode water outlet and the cathode water outlet on the plane where the proton exchange membrane is located coincide with each other.

8. The membrane electrode assembly according to claim 7, characterized in that: The first hydrogen outlet, the second hydrogen outlet, the anode water inlet and the anode water outlet are all surrounded by the first sealing strip; The third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet and the cathode water outlet are all surrounded by the second sealing strip.

9. The membrane electrode assembly according to claim 8, characterized in that: The edge of the first hydrogen outlet, the second hydrogen outlet, the anode water inlet or the anode water outlet is a first distance away from the first sealing strip; The edge of the third hydrogen outlet, the fourth hydrogen outlet, the cathode water inlet or the cathode water outlet is a second distance away from the second sealing strip.

10. An electrolytic cell, characterized in that: The electrolytic cell comprises an anode bipolar plate, a cathode bipolar plate and a membrane electrode assembly arranged between the anode bipolar plate and the cathode bipolar plate, wherein the membrane electrode assembly comprises: an anode frame, a proton exchange membrane and a cathode frame; Anode cavity openings are respectively arranged at both ends of the anode frame, and a first sealing strip surrounding the anode cavity opening is arranged on one side of the anode frame close to the proton exchange membrane; Both ends of the cathode frame are respectively provided with cathode cavity openings, and a second sealing strip surrounding the cathode cavity opening is provided on a side of the cathode frame close to the proton exchange membrane; The vertical projections of the anode cavity opening and the cathode cavity opening on the plane where the proton exchange membrane is located overlap, and the vertical projections of the first sealing strip and the second sealing strip on the plane where the proton exchange membrane is located do not overlap and do not intersect.

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