Membrane electrode assembly and fuel cell

Abstract

The utility model relates to a membrane electrode assembly and a fuel cell, and relates to the technical field of fuel cells. The membrane electrode assembly comprises a proton exchange membrane, two first frames, two second frames and two gas diffusion layers. A proton exchange membrane includes a middle portion and an edge portion surrounding the middle portion. Two second frames; each second frame is positioned on one side, far away from the edge part of the proton exchange membrane, of one first frame; the part, far away from the center line of the proton exchange membrane, of the first frame is connected with the second frame. The two gas diffusion layers are respectively positioned in the two second frames; the part, close to the center line of the proton exchange membrane, of the first frame is connected with the gas diffusion layer. Wherein on at least one side of the proton exchange membrane, the gas diffusion layer is flush with the surface, far away from the proton exchange membrane, of the second frame. Therefore, the stability of the membrane electrode assembly can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, concretely relates to a membrane electrode assembly, fuel cell. BACKGROUND

[0002] Fuel cell is a kind of electrochemical device that hydrogen-oxygen chemical energy is directly converted into electric energy, and hydrogen fuel cell has technical advantages such as high efficiency, low noise, zero pollution.Fuel cell is mainly composed of core component bipolar plate and membrane electrode in turn, and wherein, membrane electrode assembly is the most important core component of proton exchange membrane fuel cell, bears the multiphase material transport in fuel cell, and through electrochemical reaction, chemical energy is converted into electric energy, and its performance directly determines the performance of fuel cell.

[0003] The stability of membrane electrode assembly is the key factor influencing the performance of fuel cell.The stability of membrane electrode is directly related to whether it can continuously and efficiently carry out electrochemical reaction, thereby affecting the output power, energy conversion efficiency and life of fuel cell. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of membrane electrode assembly, fuel cell, to at least solve the technical problem of poor stability of membrane electrode in relevant technology.In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0005] According to the first aspect of the utility model, a kind of membrane electrode assembly includes: proton exchange membrane, two first frames, two second frames and two layers of gas diffusion layers.

[0006] Proton exchange membrane includes middle part and edge portion around middle part.

[0007] Two first frames are respectively connected to the two sides of the edge portion of proton exchange membrane along the first direction.The first direction is the thickness direction of proton exchange membrane.

[0008] Two second frames;Each second frame is located at the side of one first frame away from the edge portion of proton exchange membrane;The part of first frame away from the center line of proton exchange membrane is connected with second frame.

[0009] Two layers of gas diffusion layers are respectively located in two second frames.The part of first frame close to the center line of proton exchange membrane is connected with gas diffusion layer.

[0010] Wherein, on at least one side of proton exchange membrane, the surface of gas diffusion layer and second frame away from proton exchange membrane is flush.

[0011] According to the technical means, the membrane electrode can realize accurate positioning of the gas diffusion layer thickness, makes the assembly between layers easier and more accurate, reduces the error and complexity in the assembly process, helps to prevent the gas diffusion layer from being damaged by unnecessary friction or extrusion during the assembly or operation process, and can also realize better sealing effect and reduce the possibility of gas leakage.

[0012] Further, on at least one side of the proton exchange membrane, the side of the gas diffusion layer is attached to the inner side of the second frame.

[0013] According to the technical means, the membrane electrode can improve the alignment accuracy of the gas diffusion layer, reduce the contact resistance, improve the stability of the membrane electrode assembly, and improve the sealing property of the membrane electrode assembly.

[0014] Further, the membrane electrode assembly further comprises two first adhesive layers, which are located between the first frame and the gas diffusion layer.

[0015] The size of the first adhesive layer along the second direction is 2mm-4mm, and the second direction is the direction from any position point on the first adhesive layer to the center line of the proton exchange membrane.

[0016] According to the technical means, the membrane electrode can improve the stability of the membrane electrode assembly and the sealing property of the membrane electrode assembly.

[0017] Further, the material of the first adhesive layer comprises ultraviolet curing glue.

[0018] According to the technical means, the membrane electrode can further improve the stability of the membrane electrode assembly and the sealing property of the membrane electrode assembly.

[0019] Further, the gas diffusion layer comprises a substrate layer and a microporous layer stacked along the first direction. The microporous layer is closer to the proton exchange membrane than the substrate layer; the microporous layer located on the same side of the proton exchange membrane is connected with the first frame.

[0020] According to the technical means, the membrane electrode can help to ensure accurate positioning and stable fixation of the gas diffusion layer in the membrane electrode assembly. At the same time, the sealing property of the membrane electrode assembly can be improved.

[0021] Further, the membrane electrode assembly further comprises two catalyst layers located in the two first frames respectively. The catalyst layer is attached to the middle part of the proton exchange membrane. The side of the catalyst layer is attached to the inner side of the first frame.

[0022] According to the technical means, the membrane electrode can maximize the utilization rate of raw materials of the membrane electrode, thereby maximizing the efficiency of the electrochemical reaction of the fuel cell.

[0023] Further, the gas diffusion layer includes a microporous layer. The microporous layer on the same side of the proton exchange membrane is partially in contact with the catalyst layer.

[0024] According to the technical means, the membrane electrode can improve the contact interface between the microporous layer and the catalyst layer, and is beneficial to the distribution and transmission efficiency of the gas.

[0025] Further, the size of the first frame along the first direction is greater than 0 and less than or equal to 45 mu m.

[0026] According to the technical means, the membrane electrode further improves the contact interface between the microporous layer and the catalyst layer, and is beneficial to improve the distribution and transmission efficiency of the gas.

[0027] Further, the membrane electrode assembly further includes two second adhesive layers. The second adhesive layer is located between the first frame and the proton exchange membrane.

[0028] The material of the second adhesive layer includes at least one of hot melt adhesive, pressure sensitive adhesive and thermosetting adhesive.

[0029] According to the technical means, the membrane electrode can improve the stability of the membrane electrode assembly and the sealing property of the membrane electrode assembly.

[0030] Further, the membrane electrode assembly further includes two third adhesive layers. The third adhesive layer is located between the first frame and the second frame.

[0031] The material of the third adhesive layer includes at least one of hot melt adhesive, pressure sensitive adhesive and thermosetting adhesive.

[0032] According to the technical means, the membrane electrode can improve the stability of the membrane electrode assembly and the sealing property of the membrane electrode assembly.

[0033] According to the second aspect of the utility model, provide a kind of fuel cell, including the membrane electrode assembly of any one of the above possible implementation.

[0034] The utility model has the advantages of:

[0035] (1) The membrane electrode assembly provided by the utility model realizes accurate positioning of the thickness of the gas diffusion layer, makes the assembly of each layer easier and more accurate, reduces errors and complexity in the assembly process, is also helpful for the membrane electrode assembly to realize good sealing effect and reduce the possibility of gas leakage. Moreover, the thickness of the gas diffusion layer can be determined according to the optimal compression rate of the gas diffusion layer, so as to determine the thickness of the second frame; by limiting the gas diffusion layer in the second frame layer, the membrane electrode assembly and the bipolar plate can be prevented from moving, deforming or deteriorating in mass transfer due to excessive compression of the gas diffusion layer during the assembly process, and the stability of the membrane electrode assembly is improved.

[0036] (2) The membrane electrode assembly provided by the utility model improves the stable connection between each layer by arranging the adhesive layer between the proton exchange membrane and the first frame, between the first frame and the second frame, and between the gas diffusion layer and the first frame, and further improves the stability of the membrane electrode assembly.

[0037] (3) The membrane electrode assembly provided by the utility model can improve the alignment accuracy of the gas diffusion layer by matching the side surface of the gas diffusion layer with the inner side surface of the second frame, can significantly reduce the contact resistance relative to the direct matching of the gas diffusion layer on the catalyst layer, can also prevent the gas diffusion layer from moving during the operation of the membrane electrode assembly, further improves the stability of the membrane electrode assembly, and can also reduce or eliminate the gap between the gas diffusion layers, reduces the risk of gas leakage, and helps to improve the sealing performance of the membrane electrode assembly.

[0038] (4) The membrane electrode assembly provided by the utility model can limit the membrane electrode active area by arranging the catalyst layer in the two first frames and matching the side surface of the catalyst layer with the inner side surface of the first frame, can quantitatively spray the catalyst slurry, improve the spraying efficiency, maximize the utilization rate of the membrane electrode raw materials, help to ensure the close contact between the catalyst layer and the middle part of the proton exchange membrane, and thus maximize the efficiency of the electrochemical reaction of the fuel cell.

[0039] It should be noted that the technical effects brought by the second aspect can be referred to the technical effects brought by the corresponding implementation modes in the first aspect, which will not be repeated here.

[0040] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of a membrane electrode assembly according to an exemplary embodiment;

[0042] Figure 2 is a top view of a membrane electrode assembly according to an exemplary embodiment.

[0043] Figure 3 This is a schematic diagram of the structure of a fuel cell according to an exemplary embodiment.

[0044] Wherein, 1-proton exchange membrane; 2-catalyst layer; 3-gas diffusion layer; 31-microporous layer; 32-substrate layer; 4-first adhesive layer; 5-second adhesive layer; 6-first frame; 7-second frame; 8-third adhesive layer; 10-membrane electrode assembly. Detailed Implementation

[0045] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0046] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0047] In the accompanying drawings of this disclosure, for example, 1 / 2 indicates that both component 1 and component 2 can refer to the same component, for example, in the accompanying drawings. Figure 2 In the figure, 31 / 3 indicates that both the gas diffusion layer 3 and the microporous layer 31 can be represented by this component. Other similar reference numerals appearing in the figures also follow the above explanation.

[0048] A fuel cell is a chemical power source that directly converts the chemical energy of fuels such as hydrogen and methanol into electrical energy. It works by using an electrolyte to cause an electrochemical reaction between the fuel (such as hydrogen) and the oxidant (such as oxygen) at the electrodes, generating a potential difference that produces a low-voltage direct current output. This conversion process avoids the low efficiency problems of converting thermal energy into mechanical and electrical energy in traditional combustion methods, resulting in a higher energy conversion efficiency for fuel cells.

[0049] Fuel cells offer advantages such as high efficiency, environmental friendliness, and sustainability, and have broad application prospects in various fields. In the automotive sector, fuel cell vehicles have attracted widespread attention due to their long driving range, rapid hydrogen refueling, and zero emissions.

[0050] like Figure 1As shown, the utility model provides a kind of fuel cell, including membrane electrode assembly 10.

[0051] Membrane electrode assembly 10 (Membrane Electrode Assembly, MEA) is the most core component of fuel cell, usually by three key materials of proton exchange membrane, catalyst layer and gas diffusion layer are composed, and possibly also include the frame of sealing and fixing function.The stability of membrane electrode assembly is a key factor, which directly determines the power density, durability and service life of hydrogen fuel cell, and these performances are influenced by multiple factors.

[0052] The stability of membrane electrode assembly is directly related to whether fuel cell can continuously and efficiently carry out electrochemical reaction, thereby affecting the output power, energy conversion efficiency and life of fuel cell.

[0053] Based on this, as Figure 2 As shown, some embodiments of the utility model provide a kind of membrane electrode assembly 10, including proton exchange membrane 1, two first frames 6, two second frames 7 and two layers of gas diffusion layer 3.

[0054] Proton exchange membrane 1 includes middle part and edge part around middle part.

[0055] Two first frames 6 are respectively connected to the two sides of the edge part of proton exchange membrane 1 along the first direction Y.The first direction Y is the thickness direction of proton exchange membrane 1.

[0056] Two second frames 7;Each second frame 7 is located at the side of one first frame 6 away from the edge part of proton exchange membrane 1;The part of first frame 6 away from the center line A-A of proton exchange membrane 1 is connected with second frame 7.

[0057] Two layers of gas diffusion layer 3 are respectively located in two second frames 7.The part of first frame 6 close to the center line A-A of proton exchange membrane 1 is connected with gas diffusion layer 3.

[0058] Wherein, on at least one side of proton exchange membrane 1, the surface of gas diffusion layer 3 and second frame 7 away from proton exchange membrane 1 is flush.

[0059] Proton exchange membrane 1 is the core in membrane electrode assembly 10, allows proton (i.e. hydrogen ion) to pass through, but prevents electron and gas (such as hydrogen and oxygen) to pass through directly, is the key to realize high efficiency, pollution-free energy conversion of fuel cell.Edge part is the part connected with first frame 6, middle part is the part not connected, and edge part provides the interface for the connection of two first frames 6.At least one side of proton exchange membrane 1 is used as anode or cathode in electrochemical reaction respectively.

[0060] Two gas diffusion layers 3, cathode diffusion layer and anode diffusion layer, are the channels for hydrogen and oxygen to enter the proton exchange membrane 1 to react. The gas diffusion layers 3 also have certain hydrophobicity and air permeability to ensure that the reaction gas can reach the catalyst layer 2 smoothly, while the water produced by the reaction is discharged.

[0061] Two first frames 6 are connected to the edge part of the proton exchange membrane 1, which mainly functions to fix the proton exchange membrane 1 to prevent it from moving or deforming during the operation of the fuel cell, while providing an interface for connecting with the second frame 7. The first frame 6 also has a sealing function to ensure that the reaction gas (hydrogen and oxygen) does not leak from the edge of the membrane. During the assembly process, the gas diffusion layer 3 may be subjected to other pressure or friction, and the first frame 6 also provides support during the compression of the gas diffusion layer 3, acting as a support structure for the gas diffusion layer 3 to prevent it from being excessively compressed or deformed during the assembly process. To improve the stability of the membrane electrode assembly 10.

[0062] Two second frames 7 further provide structural support and sealing functions, and the second frame 7 also functions to position the gas diffusion layer 3 to ensure that the gas can be evenly and effectively diffused to the surface of the proton exchange membrane 1 to promote the electrochemical reaction.

[0063] In which, the surface of the gas diffusion layer 3 and the second frame 7 away from the proton exchange membrane 1 is flush, that is, the distance between the surface of the gas diffusion layer 3 away from the proton exchange membrane 1 and the surface of the proton exchange membrane 1 close to the gas diffusion layer 3 is equal to the distance between the surface of the second frame 7 away from the proton exchange membrane 1 and the surface of the proton exchange membrane 1 close to the second frame 7, achieving accurate positioning of the thickness of the gas diffusion layer 3, making the assembly between the layers easier and more accurate, reducing the error and complexity in the assembly process; also helps the membrane electrode assembly 10 to achieve better sealing effect, reducing the possibility of gas leakage. Moreover, the thickness of the gas diffusion layer 3 can be determined according to the optimal compression rate of the gas diffusion layer 3, so that the thickness of the second frame 7 can be determined, and by limiting the gas diffusion layer 3 in the second frame layer 7, it can prevent the membrane electrode assembly 10 and the bipolar plate from moving, deforming or transmitting worse due to excessive compression during the assembly process, improving the stability of the membrane electrode assembly 10.

[0064] In one possible implementation, as shown in Figures 2-3 On at least one side of the proton exchange membrane, the side surface of the gas diffusion layer 3 is in contact with the inner side surface of the second frame 7.

[0065] That is, the gas diffusion layer 3 is tightly embedded in the second frame 7, and through the above arrangement, the alignment accuracy of the gas diffusion layer 3 can be improved, the contact resistance can be significantly reduced relative to the at least one side of the proton exchange membrane directly attached to the gas diffusion layer 3; the displacement of the gas diffusion layer 3 during the operation of the membrane electrode assembly 10 can be prevented, and the stability of the membrane electrode assembly 10 is further improved; the gap between the gas diffusion layers 3 can be reduced or eliminated, the risk of gas leakage is reduced, and the sealing performance of the membrane electrode assembly 10 is improved.

[0066] In the embodiment, as shown in the figure, Figure 2 The membrane electrode assembly 10 further comprises two first adhesive layers 4. The first adhesive layer 4 is located between the first frame 6 and the gas diffusion layer 3.

[0067] The size D1 of the first adhesive layer 4 along the second direction X is 2mm-4mm, and the second direction X is the direction from any position point on the first adhesive layer 4 to the center line of the proton exchange membrane 1.

[0068] Exemplarily, the size D1 of the first adhesive layer 4 along the second direction X can be 2mm, 2.5mm, 3mm, 3.5mm or 4mm, etc., which is not limited here.

[0069] The first adhesive layer 4 is located between the first frame 6 and the gas diffusion layer 3, and the size of the first adhesive layer 4 along the second direction X is 2mm-4mm, which can prevent the displacement of the gas diffusion layer 3 during the operation of the membrane electrode assembly 10, improve the stability of the membrane electrode assembly 10, and reduce or eliminate the gap between the gas diffusion layers 3, reduce the risk of gas leakage, and improve the sealing performance of the membrane electrode assembly 10.

[0070] In the embodiment, the material of the first adhesive layer 4 comprises ultraviolet curing glue.

[0071] By using ultraviolet curing glue, the first frame 6 and the gas diffusion layer 3 can be quickly cured, and the curing speed is improved; the ultraviolet curing glue has good weather resistance after curing, can resist the influence of harsh environmental factors such as humidity, high temperature and low temperature, and maintain stable adhesive performance, and the ultraviolet curing glue has high adhesive strength, which can ensure the firm connection between the gas diffusion layer 3 and the first frame 6, and is beneficial to improve the sealing performance and stability of the membrane electrode assembly 10.

[0072] In the embodiment, as shown in the figure, Figure 2 The gas diffusion layer 3 comprises a substrate layer 32 and a microporous layer 31 stacked along the first direction Y. The microporous layer 31 is closer to the proton exchange membrane 1 than the substrate layer 32; the microporous layer 31 located on the same side of the proton exchange membrane 1 is connected with the first frame 6.

[0073] The substrate layer 32 is the main supporting structure of the gas diffusion layer 3, providing the necessary mechanical strength and stability. The material of the substrate layer 32 typically has good electrical conductivity and permeability, allowing electrons and gases (such as hydrogen and oxygen) to pass through smoothly. The microporous layer 31 is located above the substrate layer 32 (i.e., closer to the proton exchange membrane 1), and its main function is to optimize gas distribution and transport. The microporous layer 31 has numerous tiny pores, which can uniformly distribute the reactant gases and promote gas diffusion to the surface of the proton exchange membrane 1. Furthermore, the microporous layer 31 can also serve as a water management layer, helping to regulate the water content inside the fuel cell. Stacking the substrate layer 32 and the microporous layer 31 together to form a unified gas diffusion layer 3 helps to achieve the multifunctionality of the gas diffusion layer 3, providing mechanical support, gas transport, and water management functions simultaneously.

[0074] Because the microporous layer 31 is closer to the proton exchange membrane 1 than the substrate layer 32, it can more effectively transport the reactant gas to the surface of the proton exchange membrane 1, thereby improving the efficiency of the electrochemical reaction. Furthermore, the microporous layer 31 can also serve as a protective layer for the proton exchange membrane 1, preventing it from being mechanically damaged or chemically corroded. Moreover, the microporous layer 31, located on the same side of the proton exchange membrane 1, is connected to the first frame 6, which helps ensure the accurate positioning and stable fixation of the gas diffusion layer 3 within the membrane electrode assembly 10. Simultaneously, it can also improve the sealing performance of the membrane electrode assembly 10, preventing the reactant gas from leaking into the external environment.

[0075] In this embodiment, as Figure 2 As shown, the membrane electrode assembly 10 further includes two catalyst layers 2, each located within one of the two first frame frames 6. The catalyst layers 2 are bonded to the middle portion of the proton exchange membrane 1. The sides of the catalyst layers 2 are bonded to the inner sides of the first frame frames 6.

[0076] Catalyst layer 2 is a key component of the membrane electrode assembly 10, comprising an anode catalyst layer and a cathode catalyst layer. Catalyst layer 2 contains highly active catalyst materials (such as platinum or platinum alloys) to accelerate the electrochemical reaction of hydrogen and oxygen, thereby generating electricity and water. Catalyst layer 2 is in contact with the middle portion of proton exchange membrane 1, which is crucial for achieving the electrochemical reaction. During fuel cell operation, hydrogen reaches catalyst layer 2 through gas diffusion layer 3 on one side, where it is decomposed into protons and electrons under the action of the catalyst. Protons migrate through proton exchange membrane 1 to the other side, where they combine with oxygen arriving through gas diffusion layer 3 on the other side and electrons from the external circuit on catalyst layer 2 to generate water.

[0077] The catalyst layer 2 is located within the two first frames 6, and the side of the catalyst layer 2 is in contact with the inner side of the first frame 6, that is, the catalyst layer 2 is fixed in the area within the two first frames 6. This arrangement defines the active area of the membrane electrode, allows quantitative spraying of the catalyst slurry, improves the spraying efficiency while maximizing the utilization rate of the raw materials of the membrane electrode, and helps to ensure that the catalyst layer 2 is in close contact with the middle part of the proton exchange membrane 1, thereby maximizing the efficiency of the electrochemical reaction of the fuel cell.

[0078] In addition, compared with the method of spraying the catalyst slurry first and then cutting and packaging the two first frames 6, the folding of the proton exchange membrane 1 coated with the catalyst layer 2 and the unevenness of the proton exchange membrane 1 caused by the temperature difference between the spraying equipment and the environment during the spraying process can be avoided.

[0079] In this embodiment, as shown in Figure 2 The gas diffusion layer 3 includes a microporous layer 31. The microporous layer 31 located on the same side of the proton exchange membrane 1 is partially in contact with the catalyst layer 2.

[0080] During the operation of the fuel cell, the reaction gas (such as hydrogen and oxygen) passes through the microporous layer 31 of the gas diffusion layer 3, and in the microporous layer 31, the gas further diffuses through the tiny pores to the area in contact with the catalyst layer 2. On the catalyst layer 2, gas molecules are adsorbed and dissociated into ions and electrons, thereby initiating an electrochemical reaction.

[0081] The above arrangement can ensure that the gas transmitted from the gas diffusion layer 3 can directly reach the catalyst layer 2 and undergo an electrochemical reaction under the action of the catalyst. The partial contact improves the contact interface between the microporous layer 31 and the catalyst layer 2, which is beneficial to the distribution and transmission efficiency of the gas, so that the reaction gas (such as hydrogen and oxygen) can be efficiently transmitted to the catalyst layer 2 for electrochemical reaction.

[0082] In this embodiment, as shown in Figure 2 The size D2 of the first frame 6 along the first direction Y is greater than 0 and less than or equal to 45 μm.

[0083] For example, the size D2 of the first frame 6 along the first direction Y can be 10 μm, 20 μm, 30 μm, 40 μm, or 45 μm, etc., which is not limited here.

[0084] The above arrangement makes the size D2 of the first frame 6 along the first direction Y smaller, which can make the distance between the gas diffusion and the catalyst smaller, further improving the contact interface between the microporous layer 31 and the catalyst layer 2, which is beneficial to improve the distribution and transmission efficiency of the gas.

[0085] In this embodiment, as shown in Figure 2As shown, the membrane electrode assembly 10 further includes two second adhesive layers 5. The second adhesive layers 5 are located between the first frame 6 and the proton exchange membrane 1.

[0086] The above configuration allows for a stable connection between the first frame 6 and the proton exchange membrane 1, preventing the proton exchange membrane 1 from moving or deforming during the assembly and operation of the membrane electrode assembly 10, thereby improving the structural stability of the membrane electrode assembly 10. At the same time, the second adhesive layer 5 also serves as a seal to prevent reactive gases (such as hydrogen and oxygen) from leaking out from the gap between the proton exchange membrane 1 and the first frame 6.

[0087] The material of the second adhesive layer 5 includes at least one of hot melt adhesive, pressure-sensitive adhesive and thermosetting adhesive.

[0088] Hot melt adhesive melts and becomes fluid when heated, quickly filling and bonding the contact surface between the first frame 6 and the proton exchange membrane 1. Upon cooling, the hot melt adhesive solidifies to form a strong adhesive layer. Pressure-sensitive adhesive has good initial tack and holding power, achieving bonding under pressure at room temperature. Thermosetting adhesive undergoes a chemical reaction and cures upon heating, forming an adhesive layer with high strength and chemical resistance.

[0089] The second adhesive layer 5 can be selected from at least one of the above-mentioned hot melt adhesive, pressure-sensitive adhesive and thermosetting adhesive, all of which can achieve a stable connection between the first frame 6 and the proton exchange membrane 1.

[0090] In this embodiment, as Figure 2 As shown, the membrane electrode assembly 10 further includes two third adhesive layers 8. The third adhesive layers 8 are located between the first frame 6 and the second frame 7.

[0091] The above configuration can form a stable connection between the first frame 6 and the second frame 7, which can prevent the first frame 6 and the second frame 7 from moving or deforming during the assembly and operation of the membrane electrode assembly 10, thereby improving the stability of the membrane electrode assembly 10; at the same time, the third adhesive layer 8 also plays a sealing role, preventing the reaction gases (such as hydrogen and oxygen) from leaking out from the gap between the first frame 6 and the second frame 7.

[0092] The material of the third adhesive layer 8 includes at least one of hot melt adhesive, pressure-sensitive adhesive and thermosetting adhesive.

[0093] As described above regarding hot melt adhesive, pressure-sensitive adhesive, and thermosetting adhesive, the third adhesive layer 8 can be selected from at least one of the above-mentioned hot melt adhesive, pressure-sensitive adhesive, and thermosetting adhesive, all of which can achieve a stable connection between the first frame 6 and the second frame 7.

[0094] The above examples are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or transformations made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A membrane electrode assembly, characterized by, The application relates to a membrane electrode assembly, comprising: a proton exchange membrane (1) comprising a middle part and an edge part surrounding the middle part; two first frames (6) respectively connected to two sides of the edge part of the proton exchange membrane (1) along a first direction; the first direction is the thickness direction of the proton exchange membrane (1); two second frames (7); each second frame (7) is located on one side of the first frame (6) away from the edge part of the proton exchange membrane (1); the part of the first frame (6) away from the center line of the proton exchange membrane (1) is connected with the second frame (7); and two gas diffusion layers (3) respectively located in the two second frames (7); the part of the first frame (6) close to the center line of the proton exchange membrane (1) is connected with the gas diffusion layer (3); wherein, on at least one side of the proton exchange membrane (1), the surface of the gas diffusion layer (3) and the second frame (7) away from the proton exchange membrane (1) is flush.

2. The membrane electrode assembly of claim 1, wherein, On at least one side of the proton exchange membrane (1), the side of the gas diffusion layer (3) is attached to the inner side of the second frame (7).

3. The membrane electrode assembly of claim 1, wherein, Further comprising: two first adhesive layers (4); the first adhesive layer (4) is located between the first frame (6) and the gas diffusion layer (3); wherein, the size range of the first adhesive layer (4) along a second direction is 2mm-4mm; the second direction is the direction from any position point on the first adhesive layer (4) to the center line of the proton exchange membrane (1).

4. The membrane electrode assembly of claim 3, wherein, The material of the first adhesive layer (4) comprises ultraviolet curing glue.

5. The membrane electrode assembly of claim 1, wherein, The gas diffusion layer (3) comprises a substrate layer and a microporous layer stacked along the first direction; the microporous layer is closer to the proton exchange membrane (1) than the substrate layer; the microporous layer located on the same side of the proton exchange membrane (1) is connected with the first frame (6).

6. The membrane electrode assembly of claim 5, wherein, Further comprising: two catalyst layers (2) respectively located in the two first frames (6); the catalyst layer (2) is attached to the middle part of the proton exchange membrane (1); the side of the catalyst layer (2) is attached to the inner side of the first frame (6).

7. The membrane electrode assembly of claim 6, wherein, The gas diffusion layer (3) comprises the microporous layer; the microporous layer located on the same side of the proton exchange membrane (1) is partially in contact with the catalyst layer (2).

8. The membrane electrode assembly of claim 6, wherein, The size of the first frame (6) along the first direction is greater than 0 and less than or equal to 45um.

9. The membrane-electrode assembly according to any one of claims 1 to 5, characterized in that Further comprising: two second adhesive layers (5); the second adhesive layer (5) is located between the first frame (6) and the proton exchange membrane (1); wherein, the material of the second adhesive layer (5) comprises one of hot melt glue, pressure sensitive adhesive and thermosetting adhesive.

10. The membrane-electrode assembly according to any one of claims 1 to 5, characterized in that Further comprising: two third adhesive layers (8); the third adhesive layer (8) is located between the first frame (6) and the second frame (7); wherein, the material of the third adhesive layer (8) comprises one of hot melt glue, pressure sensitive adhesive and thermosetting adhesive.

11. A fuel cell characterized by comprising: The application further relates to a membrane electrode assembly comprising any one of the proton exchange membranes according to claims 1-10.

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