A fuel cell membrane electrode frame and a membrane electrode assembly

Abstract

The utility model discloses a fuel cell membrane electrode frame and a membrane electrode assembly, comprising: a lower frame, a middle frame is arranged on the upper surface of the lower frame, an upper frame is arranged on the upper surface of the middle frame, an electrode core is arranged in the gap between the lower frame, the middle frame and the upper frame, an inner edge of the middle frame forms a groove relative to the inner edges of the lower frame and the upper frame, the electrode core and the groove are adapted to each other, a base is arranged on the lower surface of the lower frame, a cover is arranged on the upper surface of the upper frame, a fixing block is fixedly connected to the side surface of the base, a clamping mechanism is arranged inside the fixing block, the thickness difference between the electrode core and the frame area is eliminated by the arranged groove, so that the electrode core is subjected to force on the frame part rather than the electrode core part during hot pressing, thereby ensuring that the frame is pressed flatly without bubbles, and also facilitating the access of the electrode core to the inside of the frame, thus playing a role in positioning and installation.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell membrane electrode frame and a membrane electrode assembly. Background Art

[0002] The fuel cell membrane electrode frame is an important component of the fuel cell. It usually surrounds the membrane electrode assembly and is tightly integrated with it to ensure the sealing and structural integrity during the operation of the fuel cell. The membrane electrode assembly is the core part of the fuel cell, which includes the proton exchange membrane, catalyst layer and gas diffusion layer.

[0003] When installing existing fuel cell membrane electrode frames and membrane electrode assemblies, the upper frame and the lower frame are generally directly bonded to the electrode core. As a result, during hot pressing, the thickness difference between the electrode core and the frame area causes the electrode core to be stressed on the electrode core part, and then bubbles will appear after the frame is pressed, reducing production quality. In addition, during hot pressing, the expansion of the glue layer will increase the gap between the frame and the electrode core, reducing the sealing. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a fuel cell membrane electrode frame and membrane electrode assembly, wherein a groove is formed by the inner edge of the middle frame relative to the inner edges of the lower frame and the upper frame, and the electrode core and the groove are adapted to each other, thereby eliminating the thickness difference between the electrode core and the frame area, so that the force is applied to the frame part rather than the electrode core part during hot pressing, thereby ensuring that the frame is pressed flat without bubbles, and also facilitating the access of the electrode core to the interior of the frame, thereby playing a role in positioning and installation; the clamping mechanism provided can prevent the edge from expanding due to the expansion of the adhesive layer during hot pressing. A gap appears between the frame and the electrode core, reducing the quality. When the cover is closed, push the pull block downward, the slider compresses the second spring, and press the button at the same time. The first wedge block and the second wedge block squeeze and slide against each other, and the connecting rod drives the card blocks to approach each other. At the same time, the second wedge block compresses the first spring. When the lower surface of the pull block is against the fixed block, release the button. Under the action of the first spring, the second wedge block slides in the opposite direction, and then the connecting rod drives the card block to embed into the card slot, so that the pull block is fixed. Since the second spring is compressed at this time, each frame and the rubber layer are squeezed toward the middle to ensure the tightness of the connection.

[0005] The utility model also provides a fuel cell membrane electrode frame and membrane electrode assembly having the above-mentioned type, including: a lower frame, a middle frame is arranged on the upper surface of the lower frame, an upper frame is arranged on the upper surface of the middle frame, an electrode core is arranged in the gap between the lower frame, the middle frame and the upper frame, the inner edge of the middle frame forms a groove relative to the inner edges of the lower frame and the upper frame, the electrode core and the groove are adapted to each other, a base is arranged on the lower surface of the lower frame, a cover plate is arranged on the upper surface of the upper frame, a fixing block is fixedly connected to the side surface of the base, and a clamping mechanism is arranged inside the fixing block.

[0006] According to the fuel cell membrane electrode frame and membrane electrode assembly, the electrode core includes a proton exchange membrane, a catalyst layer and a diffusion layer. The catalyst layer is coated on both side surfaces of the proton exchange membrane, and the diffusion layer is coated on the outer side surface of the catalyst layer.

[0007] According to the fuel cell membrane electrode frame and membrane electrode assembly, a protrusion is fixedly connected to the upper surface of the base, and distribution holes are provided on the outer surfaces of the lower frame, middle frame, upper frame and cover plate, and the protrusions and distribution holes are adapted to each other.

[0008] According to the described fuel cell membrane electrode frame and membrane electrode assembly, the clamping mechanism includes a button, a first wedge block, a connecting rod, a second wedge block, a clamping block and a pulling block, the side surface of the button is fixedly connected to the first wedge block, the side surface of the first wedge block is slidably connected to the second wedge block, one end of the connecting rod is fixedly connected to the second wedge block, the other end of the connecting rod is fixedly connected to the clamping block, and a clamping groove is provided inside the pulling block.

[0009] According to the fuel cell membrane electrode frame and membrane electrode assembly, the inner wall of the fixed block is fixedly connected to a vertical plate, the side surface of the vertical plate is fixedly connected to a first spring, and the other end of the first spring is fixedly connected to a second wedge block.

[0010] According to the fuel cell membrane electrode frame and membrane electrode assembly, the side surface of the button is fixedly connected with a guide block, and the outer surface of the guide block is slidably connected with the fixed block.

[0011] According to the fuel cell membrane electrode frame and membrane electrode assembly, the side surface of the cover plate is fixedly connected to a fixing frame, the side surface of the pull block is fixedly connected to a slider, and the side surface of the slider is slidably connected to the fixing frame.

[0012] According to the fuel cell membrane electrode frame and membrane electrode assembly, a second spring is fixedly connected to the lower surface of the slider, and the other end of the second spring is fixedly connected to the fixing frame.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0015] Figure 1 This is a schematic diagram of the overall structure of a fuel cell membrane electrode frame and a membrane electrode assembly according to the utility model;

[0016] Figure 2 This is a schematic diagram of the connection between a fuel cell membrane electrode frame and a membrane electrode assembly membrane electrode core and a frame according to the utility model;

[0017] Figure 3 This is a schematic diagram of the overall structural connection of a fuel cell membrane electrode frame and a membrane electrode assembly according to the utility model;

[0018] Figure 4 It is a partial cross-sectional schematic diagram of a clamping mechanism of a fuel cell membrane electrode frame and a membrane electrode assembly according to the utility model;

[0019] Figure 5 The utility model is a fuel cell membrane electrode frame and a membrane electrode assembly Figure 4 A partial enlarged schematic diagram in the middle.

[0020] Legend:

[0021] 1. Lower frame; 2. Middle frame; 3. Electrode core; 4. Upper frame; 5. Proton exchange membrane; 6. Catalytic layer; 7. Diffusion layer; 8. Base; 9. Cover plate; 10. Bump; 11. Fixed block; 12. Button; 13. First wedge block; 14. Connecting rod; 15. Second wedge block; 16. Block; 17. Vertical plate; 18. First spring; 19. Guide block; 20. Pull block; 21. Fixed frame; 22. Slider; 23. Second spring. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-5The utility model embodiment is a fuel cell membrane electrode frame and membrane electrode assembly, which includes: a lower frame 1, a middle frame 2 is arranged on the upper surface of the lower frame 1, an upper frame 4 is arranged on the upper surface of the middle frame 2, an electrode core 3 is arranged in the gap between the lower frame 1, the middle frame 2 and the upper frame 4, the electrode core 3 includes a proton exchange membrane 5, a catalyst layer 6 and a diffusion layer 7, the catalyst layer 6 is coated on both side surfaces of the proton exchange membrane 5, and the diffusion layer 7 is coated on the outer surface of the catalyst layer 6, the inner edge of the middle frame 2 forms a groove relative to the inner edge of the lower frame 1 and the upper frame 4, the electrode core 3 and the groove are adapted to each other, eliminating the thickness difference between the electrode core 3 and the frame area, so that the electrode core 3 is subjected to force on the frame part rather than the electrode core 3 part during hot pressing, ensuring that the frame is pressed flat without bubbles, and also convenient The electrode core 3 is connected to the interior of the frame to play a role in positioning and installation; a base 8 is provided on the lower surface of the lower frame 1, a cover plate 9 is provided on the upper surface of the upper frame 4, a fixing block 11 is fixedly connected to the side surface of the base 8, and a protrusion 10 is fixedly connected to the upper surface of the base 8. The outer surfaces of the lower frame 1, the middle frame 2, the upper frame 4 and the cover plate 9 are all provided with distribution holes, and the protrusion 10 and the distribution holes are adapted to each other. The base 8 and the protrusion 10 are used to ensure the accuracy of the fit between the frame and the electrode core 3. When the assembly needs to be installed, the lower frame 1 is first placed on the base 8, and the distribution hole passes through the protrusion 10, and then the middle frame 2 is placed on the lower frame 1, and then the electrode core 3 is fitted into the groove, and then the upper frame 4 and the cover plate 9 are placed in sequence. The cover plate 9 is used for pressing, so that the installation operation is simple.

[0024] A clamping mechanism is provided inside the fixed block 11, and the clamping mechanism includes a button 12, a first wedge block 13, a connecting rod 14, a second wedge block 15, a card block 16 and a pull block 20. The side surface of the button 12 is fixedly connected to the first wedge block 13, and the side surface of the first wedge block 13 is slidably connected to the second wedge block 15. One end of the connecting rod 14 is fixedly connected to the second wedge block 15, and the other end of the connecting rod 14 is fixedly connected to the card block 16. A card slot is provided inside the pull block 20. The inner wall of the fixed block 11 is fixedly connected to a vertical plate 17, and the side surface of the vertical plate 17 is fixedly connected to a first spring 18, and the other end of the first spring 18 is fixedly connected to the second wedge block 15. The side surface of the cover plate 9 is fixedly connected to a fixed frame 21, and the side surface of the pull block 20 is fixedly connected to a slider 22, and the side surface of the slider 22 is slidably connected to the fixed frame 21. The lower surface of the slider 22 is fixedly connected to the second spring 23, and the other end of the second spring 23 is fixedly connected to the fixed frame 21. When the cover plate 9 is pressed together, it is pushed downward. The pull block 20 is moved, and the slider 22 compresses the second spring 23. At the same time, the button 12 is pressed, and the first wedge block 13 and the second wedge block 15 are squeezed and slid against each other. The connecting rod 14 drives the card block 16 to approach each other, and at the same time, the second wedge block 15 compresses the first spring 18. When the lower surface of the pull block 20 is against the fixed block 11, the button 12 is released. Under the action of the first spring 18, the second wedge block 15 slides in the opposite direction, and then the connecting rod 14 drives the card block 16 to be embedded in the card slot, so that the pull block 20 is fixed. Since the second spring 23 is compressed, each frame and the glue layer are squeezed to avoid the expansion of the glue layer during hot pressing, resulting in a gap between the frame and the electrode core 3, thereby reducing the quality. When the hot pressing is completed, the base 8 and the cover plate 9 need to be removed. The button 12 is pressed, and the card block 16 is separated from the card slot. When the second spring 23 is extended, the slider 22 and the pull block 20 are pushed upward, and the base 8 and the cover plate 9 can be removed. At this time, the membrane electrode frame and the membrane electrode assembly are installed, which has good practicality.

[0025] A guide block 19 is fixedly connected to the side surface of the button 12 , and an outer surface of the guide block 19 is slidably connected to the fixed block 11 . The guide block 19 guides the sliding of the button 12 to avoid misalignment between the first wedge block 13 and the second wedge block 15 .

[0026] Working principle: When the assembly needs to be installed, first place the lower frame 1 on the base 8, and the distribution hole passes through the protrusion 10, then place the middle frame 2 on the lower frame 1, and then fit the electrode core 3 into the groove, and then place the upper frame 4 and the cover plate 9 in sequence. The cover plate 9 is used for pressing, which makes the installation operation simple, and the electrode core 3 and the groove are adapted to each other, eliminating the thickness difference between the electrode core 3 and the frame area, so that the electrode core 3 is stressed on the frame part rather than the electrode core 3 part during hot pressing, ensuring that the frame is pressed flat without bubbles, and also facilitating the access of the electrode core 3 to the inside of the frame, which plays a role in positioning and installation. When the cover plate 9 is closed, push the pull block 20 downward , the slider 22 compresses the second spring 23, and at the same time, the button 12 is pressed, the first wedge block 13 and the second wedge block 15 squeeze and slide against each other, the connecting rod 14 drives the card block 16 to approach each other, and at the same time, the second wedge block 15 compresses the first spring 18. When the lower surface of the pull block 20 is against the fixed block 11, the button 12 is released. Under the action of the first spring 18, the second wedge block 15 slides in the opposite direction, and then the connecting rod 14 drives the card block 16 to embed into the card slot, so that the pull block 20 is fixed. Since the second spring 23 is compressed, each frame and the glue layer are squeezed, so as to avoid the expansion of the glue layer during hot pressing, resulting in a gap between the frame and the electrode core 3, thereby reducing the quality.

[0027] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A fuel cell membrane electrode frame and a membrane electrode assembly, characterized in that: include: A lower frame (1), wherein a middle frame (2) is arranged on the upper surface of the lower frame (1), an upper frame (4) is arranged on the upper surface of the middle frame (2), an electrode core (3) is arranged in the gap between the lower frame (1), the middle frame (2) and the upper frame (4), an inner edge of the middle frame (2) forms a groove relative to the inner edges of the lower frame (1) and the upper frame (4), the electrode core (3) and the groove are mutually adapted, a base (8) is arranged on the lower surface of the lower frame (1), a cover plate (9) is arranged on the upper surface of the upper frame (4), a fixing block (11) is fixedly connected to the side surface of the base (8), and a clamping mechanism is arranged inside the fixing block (11).

2. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 1, characterized in that: The electrode core (3) comprises a proton exchange membrane (5), a catalytic layer (6) and a diffusion layer (7); the catalytic layer (6) is coated on both side surfaces of the proton exchange membrane (5), and the diffusion layer (7) is coated on the outer side surface of the catalytic layer (6).

3. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 1, characterized in that: A protrusion (10) is fixedly connected to the upper surface of the base (8), and distribution holes are arranged on the outer surfaces of the lower frame (1), the middle frame (2), the upper frame (4) and the cover plate (9), and the protrusion (10) and the distribution holes are mutually adapted.

4. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 1, characterized in that: The clamping mechanism comprises a button (12), a first wedge block (13), a connecting rod (14), a second wedge block (15), a clamping block (16) and a pulling block (20); the side surface of the button (12) is fixedly connected to the first wedge block (13); the side surface of the first wedge block (13) is slidably connected to the second wedge block (15); one end of the connecting rod (14) is fixedly connected to the second wedge block (15); the other end of the connecting rod (14) is fixedly connected to the clamping block (16); and a clamping groove is provided inside the pulling block (20).

5. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 4, characterized in that: The inner wall of the fixed block (11) is fixedly connected to a vertical plate (17), the side surface of the vertical plate (17) is fixedly connected to a first spring (18), and the other end of the first spring (18) is fixedly connected to the second wedge block (15).

6. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 4, characterized in that: A guide block (19) is fixedly connected to the side surface of the button (12), and an outer surface of the guide block (19) is slidably connected to the fixed block (11).

7. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 4, characterized in that: The side surface of the cover plate (9) is fixedly connected to a fixing frame (21), the side surface of the pull block (20) is fixedly connected to a sliding block (22), and the side surface of the sliding block (22) is slidably connected to the fixing frame (21).

8. A fuel cell membrane electrode frame and membrane electrode assembly according to claim 7, characterized in that: A second spring (23) is fixedly connected to the lower surface of the sliding block (22), and the other end of the second spring (23) is fixedly connected to the fixing frame (21).

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