Membrane electrode packaging structure

Abstract

The utility model relates to a membrane electrode packaging structure, which comprises a proton exchange membrane arranged between two aligned frames, a first recess for accommodating a gas diffusion layer is etched on one end face of each frame far away from the proton exchange membrane by laser, and a second recess for coating glue is etched at the bottom of the first recess by laser. The glue in the second recess is in contact with the gas diffusion layer accommodated in the first recess; the inner side wall of the first recess is coated with a layer of glue, and the peripheral side of the gas diffusion layer is in contact with the glue on the peripheral side wall of the first recess. The membrane electrode assembly is reasonable in design, the two frames in the membrane electrode assembly are subjected to laser imprinting and sinking, and the gas diffusion layer is embedded in the frames, so that the membrane electrode assembly can be effectively prevented from influencing the performance output of the fuel cell due to the fact that internal parts of the assembly fall off or are staggered and deviated in the running process of the fuel cell.

Description

Technical Field

[0001] This utility model relates to a membrane electrode packaging structure. Background Technology

[0002] Fuel cells are currently a crucial carrier for the development of hydrogen energy. The MEA (Mechanical Exchange Assembly) is the core component of a fuel cell, consisting of a cathode gas diffusion layer, a frame, an anode gas diffusion layer, and a proton exchange membrane coated with a catalyst layer. The bonding strength between these components plays a vital role in the electrical performance and durability of the fuel cell.

[0003] Chinese patent publication number CN 212011141U discloses a membrane electrode assembly (MEA) encapsulation structure. This method reduces the number of frame elements, using only one frame. A catalyst-coated membrane is adhered to a partial recess on the top surface of the frame, and the catalyst-coated membrane is adhered to the bottom wall of the recess. This method can reduce production costs and the risk of leakage in the sealed area. However, the MEA assembly prepared by this method is prone to gas diffusion layer misalignment during subsequent fuel cell testing, thus affecting the fuel cell's output.

[0004] Chinese patent publication number CN 114551927 B discloses a membrane electrode assembly and its sealing method. The method involves placing two frames and a proton exchange membrane in a mold, injecting sealant into the mold, and then allowing the sealant to coat the outer surface of the outer edge of the frame assembly. After curing, the assembly is demolded. This encapsulation method can make the overall membrane electrode assembly more securely sealed; however, this method is prone to generating air bubbles during the sealant injection process, increasing the risk of regional air leakage. Utility Model Content

[0005] This invention addresses the problems existing in the prior art by providing a fuel cell membrane electrode encapsulation structure that is rationally designed, effectively fixes the gas diffusion layer, prevents the diffusion layer from shifting, and reduces the risk of gas leakage.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a membrane electrode packaging structure, including a proton exchange membrane disposed between two aligned and distributed frame edges, wherein each frame edge has a first recess for accommodating a gas diffusion layer laser-etched on one end face away from the proton exchange membrane, and a second recess for applying adhesive is laser-etched at the bottom of the first recess, wherein the adhesive in the second recess is in contact with the gas diffusion layer accommodated in the first recess.

[0007] Furthermore, the inner wall of the first recess is coated with a layer of adhesive, and the periphery of the gas diffusion layer is in contact with the adhesive on the periphery of the first recess.

[0008] Furthermore, the shape of the first depression is consistent with the shape of the gas diffusion layer.

[0009] Furthermore, both the first depression and the gas diffusion layer are rectangular in shape, and the length and width of the first depression are the same as the length and width of the gas diffusion layer.

[0010] Furthermore, the depth of the first depression is the same as the thickness of the gas diffusion layer.

[0011] Furthermore, the second recess is annular in shape and corresponds to the outer periphery of the gas diffusion layer.

[0012] Furthermore, the depth of the second recess is 5–20 μm, and the width of the bottom wall of the second recess is 1–2 mm.

[0013] Furthermore, the two borders are a first border and a second border distributed at the top and bottom, respectively. The first recess of the first border is located on the upper surface, and the first recess of the second border is located on the lower surface. The proton exchange membrane is coated with a catalytic layer and is disposed on the lower surface of the first border.

[0014] Furthermore, the first frame and the second frame are bonded together by adhesive applied to the outside of the proton exchange membrane where the catalyst layer is not coated.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed. The two edges of the membrane electrode assembly are laser-printed with recesses to embed the gas diffusion layer therein, which can effectively prevent the internal parts of the membrane electrode assembly from falling off or becoming misaligned during the operation of the fuel cell, thereby affecting the performance output of the fuel cell. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the disassembled state structure of an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the front view structure of the frame in an embodiment of this utility model;

[0018] Figure 3 This is a top view of an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present invention.

[0020] In the picture:

[0021] 1-Gas diffusion layer; 2-First frame; 3-Proton exchange membrane; 4-Second frame; 5-Adhesive; 6-First recess; 7-Second recess. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figures 1-4 As shown, this utility model discloses a membrane electrode packaging structure with a double-frame design. It includes a proton exchange membrane 3 disposed between two upper and lower aligned frames. Each frame has a first recess 6 laser-etched on its end face away from the proton exchange membrane to accommodate a gas diffusion layer 1. A second recess 7 is laser-etched at the bottom of the first recess 6 for applying adhesive. The adhesive 5 in the second recess 7 contacts the gas diffusion layer 1 accommodated in the first recess 6. By laser-etching recesses on the outer sides of the upper and lower frames, the gas diffusion layer can be effectively fixed, preventing displacement and reducing the risk of leakage.

[0025] In this embodiment, the two borders are a first border 2 and a second border 4 distributed on the top and bottom, respectively. The first recess 6 of the first border 2 is located on the upper surface, and the first recess 6 of the second border 4 is located on the lower surface. That is, a gas diffusion layer 1 is provided on the first border 2, and a gas diffusion layer 1 is also provided on the second border 4. The proton exchange membrane coating 3 has a catalytic layer, and the proton exchange membrane 3 is disposed on the lower surface of the first border 2.

[0026] In this embodiment, the first frame 2 and the second frame 4 are bonded together by adhesive applied to the outer side of the proton exchange membrane 3 where the catalyst layer is not coated.

[0027] In this embodiment, a layer of adhesive is applied to the inner sidewalls of the first recess 6. The periphery of the gas diffusion layer 1 is in contact with the adhesive on the sidewalls of the first recess 6. The inner sidewalls of the first recess 6 seal the outer periphery of the gas diffusion layer 1 to prevent the gas diffusion layer 1 from shifting.

[0028] In this embodiment, the shape and size of the first recess 6 are consistent with those of the gas diffusion layer 1. Furthermore, both the first recess 6 and the gas diffusion layer 1 are rectangular, and the length and width of the first recess 6 are the same as those of the gas diffusion layer 1 (i.e., the two are the same size).

[0029] In this embodiment, the depth of the first recess 6 is the same as the thickness of the gas diffusion layer 1.

[0030] In this embodiment, the second recess 7 is ring-shaped and located on the outer periphery of the bottom of the first recess 6, and the second recess 7 corresponds to the outer periphery of the gas diffusion layer 1.

[0031] In this embodiment, the inner wall of the second recess 7 is the same size as the outer periphery of the gas diffusion layer 1.

[0032] In this embodiment, the depth of the second recess 7 is 5–20 μm, and the width of the bottom wall of the second recess 7 is 1–2 mm, as shown in the plan view. Figure 3 As shown.

[0033] Packaging methods for membrane electrode packaging structures: such as Figure 1 As shown, two borders are used, namely a first border 2 and a second border 4 distributed at the top and bottom. The encapsulation method includes the following steps:

[0034] (1) Laser etching is performed on the upper surface of the first frame 2 and the lower surface of the second frame 4 to form the first recess 6, and a second recess 7 is etched at the bottom of the first recess 6, as follows: Figure 2 As shown, the first recess 6 has the same shape and size as the gas diffusion layer 1, and its depth is the same as the thickness of the gas diffusion layer 1. The second recess 7 is annular and corresponds to the outer periphery of the gas diffusion layer 1. The inner wall of the second recess 7 is the same size as the outer periphery of the gas diffusion layer 1. The depth of the second recess 7 is 5–20 μm, and the width of its bottom wall is 1–2 mm. A planar view is shown below. Figure 3 As shown;

[0035] (2) The proton exchange membrane 3 coated with the catalyst layer is placed on the lower surface of the first frame 2. Adhesive is applied to the outside of the proton exchange membrane 3 where the catalyst layer is not coated, and the first frame 2 and the second frame 4 are aligned and bonded.

[0036] (3) Apply glue to the second recess 7 of the first frame 2, apply a layer of glue to the inner wall of the first recess 6 of the first frame 2, and place the gas diffusion layer 1 in the first recess 6 of the first frame 2, so that the outer periphery of the gas diffusion layer 1 contacts the glue on the inner wall of the first recess 6. The inner wall of the first recess 6 seals the outer periphery of the gas diffusion layer 1 to prevent the gas diffusion layer 1 from shifting. Install the gas diffusion layer 1 on the second frame 4 in the same way, such as... Figure 4 As shown;

[0037] (4) Place the assembled membrane electrode assembly into the tooling and place it in a hot press for high-temperature hot pressing and shaping.

[0038] The advantages of this invention are: laser-printed recesses are made on the two frames of the membrane electrode assembly to embed the gas diffusion layer therein, which can effectively prevent the internal parts of the membrane electrode assembly from falling off or becoming misaligned during the operation of the fuel cell, thereby affecting the performance output of the fuel cell.

[0039] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0040] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0041] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A membrane electrode packaging structure, characterized in that: It includes a proton exchange membrane disposed between two aligned frame edges. Each frame edge has a first recess for accommodating a gas diffusion layer laser-etched on its end face away from the proton exchange membrane. The bottom of the first recess has a second recess for applying adhesive, and the adhesive in the second recess is in contact with the gas diffusion layer contained in the first recess.

2. The membrane electrode packaging structure according to claim 1, characterized in that: The inner wall of the first recess is coated with a layer of adhesive, and the periphery of the gas diffusion layer is in contact with the adhesive on the periphery of the first recess.

3. The membrane electrode packaging structure according to claim 1, characterized in that: The shape of the first depression is consistent with the shape of the gas diffusion layer.

4. A membrane electrode packaging structure according to claim 1 or 3, characterized in that: Both the first depression and the gas diffusion layer are rectangular in shape, and the length and width of the first depression are the same as the length and width of the gas diffusion layer.

5. The membrane electrode packaging structure according to claim 1, characterized in that: The depth of the first depression is the same as the thickness of the gas diffusion layer.

6. The membrane electrode packaging structure according to claim 1, characterized in that: The second recess is ring-shaped and corresponds to the outer periphery of the gas diffusion layer.

7. The membrane electrode packaging structure according to claim 1, characterized in that: The depth of the second depression is 5–20 μm, and the width of the bottom wall of the second depression is 1–2 mm.

8. The membrane electrode packaging structure according to claim 1, characterized in that: The two borders are a first border and a second border distributed at the top and bottom, respectively. The first recess of the first border is located on the upper surface, and the first recess of the second border is located on the lower surface. The proton exchange membrane is coated with a catalytic layer and is disposed on the lower surface of the first border.

9. The membrane electrode packaging structure according to claim 8, characterized in that: The first frame and the second frame are bonded together by adhesive applied to the outside of the proton exchange membrane where the catalyst layer is not coated.

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