Fitting jig for membrane electrode assembly of fuel cell

Abstract

The utility model belongs to the technical field of fuel cells, and discloses a fuel cell membrane electrode assembly attaching jig which comprises a jig body, the jig body is arranged on the side, away from a membrane electrode, of a frame, and a first sealing groove and an active groove are formed in the jig body. The first sealing groove is annularly formed in the opening of the active channel and is used for clamping a first sealing element, the first sealing element can be accommodated in the first sealing groove, and the orthographic projection of the membrane electrode located in the active channel on the plane where the bottom of the active groove is located is located in the active groove, so that the membrane electrode assembly is sealed and attached; the jig body carries out height compensation on the frame with the first sealing piece in the attaching process and carries out positioning in the attaching process, and poor sealing caused by dislocation or uneven stress of the first sealing piece is avoided.

Description

Technical Field

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

[0002] The membrane electrode assembly is the power generation component of the proton exchange membrane fuel cell and one of the core components of the fuel cell. The sealing and sealing stability of the sealing frame are one of the main factors affecting the performance and life of the membrane electrode assembly. The bonding between the membrane electrode and the sealing frame is mainly done manually.

[0003] The sealing frame includes a frame, a sealing ring, and an adhesive layer protected by a release film. When forming a membrane electrode assembly, the membrane electrode needs to be sealed in the middle using the adhesive layer on the sealing frames of the cathode and anode. During the frame bonding and alignment process, the adhesive layer needs to be facing upwards. The sealing ring usually has a certain height, and its width is much smaller than the frame. Therefore, when the sealing frame is placed horizontally, it cannot be fixed flatly on the corresponding device or platform. The existing bonding and alignment method is only applicable to frames with a flat surface, while the surface of the sealing frame has an additional layer of sealing ring with a certain height. During bonding, whether it is an adsorption platform or a rolling device, a bulge will be generated on the platform due to the presence of the sealing ring, which is prone to misalignment during the bonding process, forming defects and leading to poor sealing.

[0004] Therefore, a fuel cell membrane electrode assembly bonding jig is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a fuel cell membrane electrode assembly bonding jig, which solves the problem of height difference caused by the sealing ring during the bonding process, and the problem that the sealing ring bulges on the platform and is easily misaligned during the bonding process, resulting in poor sealing.

[0006] In order to solve the above problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] A fuel cell membrane electrode assembly bonding jig is used to assist in the sealing and bonding of the membrane electrode assembly. The membrane electrode assembly includes a membrane electrode, a first seal and a frame. The first seal is arranged on one side of the frame, and the membrane electrode is arranged on the other side of the frame. Conductive channels are arranged at both ends of the frame, and an active channel is arranged in the middle of the frame. The fuel cell membrane electrode assembly bonding jig includes:

[0008] A jig body, wherein the jig body is arranged on a side of the frame away from the membrane electrode, and the jig body is provided with a first sealing groove and an active groove. The first sealing groove is arranged around the opening of the active channel, and the first sealing groove is used to clamp the first sealing member. The first sealing member can be accommodated in the first sealing groove, and the membrane electrode located in the active channel has an orthographic projection on the plane where the bottom of the active groove is located located in the active groove.

[0009] Preferably, the depth of the first sealing groove is greater than or equal to the thickness of the first sealing member, and the width of the first sealing groove is greater than or equal to the width of the first sealing member.

[0010] Preferably, there are two jig bodies, and along the bonding direction of the membrane electrode assembly, the jig bodies are respectively provided on both sides of the membrane electrode assembly.

[0011] Preferably, the fuel cell membrane electrode assembly bonding jig also includes an adsorption assembly, which includes a negative pressure tank and an intake pipe connected to the negative pressure tank. The jig body is also provided with an adsorption hole, and the intake pipe adsorbs and bonds the membrane electrode assembly to the jig body through the adsorption hole.

[0012] Preferably, there are a plurality of the adsorption holes, and the plurality of adsorption holes are spaced apart along the circumference of the fixture body. The cross-sectional shape of the adsorption holes is dot-shaped, serpentine-shaped or cross-shaped.

[0013] Preferably, the membrane electrode assembly also includes a second seal, which is arranged on one side of the frame. The fixture body also has a second sealing groove, which is arranged around the opening of the conduction channel. The second sealing groove is used to clamp the second seal, and the second seal can be accommodated in the second sealing groove.

[0014] Preferably, there are multiple second sealing grooves, multiple conduction channels, and the multiple conduction channels are evenly distributed on both sides of the active channel. The number of second sealing members is the same as the number of conduction channels, and the multiple second sealing members are all arranged between the frame and the fixture body.

[0015] Preferably, the depth of the second sealing groove is greater than or equal to the thickness of the second sealing member, and the width of the second sealing groove is greater than or equal to the width of the second sealing member.

[0016] Preferably, the frame is made of engineering plastic.

[0017] Preferably, the material of the fixture body is one of bakelite, fiberglass, and acrylic glue.

[0018] The beneficial effects of the utility model are:

[0019] The fuel cell membrane electrode assembly fitting jig provided by the present invention includes a jig body, which is arranged on the side of the frame away from the membrane electrode. The jig body is provided with a first sealing groove and an active groove. The first sealing groove is arranged around the opening of the active channel. The first sealing groove is used to clamp a first sealing member. The first sealing member can be accommodated in the first sealing groove. The membrane electrode located in the active channel has its orthographic projection on the plane where the bottom of the active groove is located located in the active groove. The active channel is cut out in the middle of the frame, and the frame is placed on the jig body so that the first sealing member is clamped in the first sealing groove of the jig body. At the same time, the frame is tightly fitted with the surface of the proton exchange membrane. Then, the jig body is fitted with the membrane electrode so that the proton exchange membrane slides through the active channel to ensure that the catalyst layer and the gas diffusion layer are not affected by external pressure during the fitting process. Finally, the fully fitted membrane electrode assembly is cut for shape and conduction channel to obtain a sealed and fully fitted membrane electrode assembly. The jig body compensates for the height of the frame during the bonding process and positions the frame during the bonding process, effectively avoiding the poor sealing caused by the misalignment or uneven force of the first seal. At the same time, it protects the first seal from compression deformation, and improves the processing accuracy of the membrane electrode assembly during the assembly process, ensures the consistency of the membrane electrode assembly, is conducive to improving the sealing performance and durability of the membrane electrode assembly, reduces the technical level requirements of workers in the production process of the membrane electrode assembly, and is conducive to realizing automated packaging production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an adhesive layer applied to a frame seal provided by an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of a frame, a first sealing member, and a second sealing member provided in an embodiment of the present utility model;

[0022] Figure 3 A schematic diagram of the structure of the fixture body provided in an embodiment of the present utility model;

[0023] Figure 4 A schematic diagram of the structure of a fuel cell membrane electrode assembly lamination jig and a membrane electrode assembly provided in an embodiment of the present invention;

[0024] Figure 5 A cross-sectional view of a fuel cell membrane electrode assembly bonding jig and a membrane electrode assembly provided in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 100, membrane electrode; 200, frame; 201, conduction channel; 202, active channel; 300, first sealing member; 400, second sealing member; 500, adhesive layer;

[0027] 1. Fixture body; 11. First sealing groove; 12. Active groove; 13. Adsorption hole; 14. Second sealing groove. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0029] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0032] like Figure 1-Figure 5As shown, in this embodiment, a fuel cell membrane electrode assembly (MEA) lamination jig is used to assist in the sealing and lamination of the MEA. The MEA includes a MEA 100, a first seal 300, and a frame 200. The first seal 300 is disposed on one side of the frame 200. Conductive channels 201 are disposed at both ends of the frame 200, and an active channel 202 is disposed in the middle of the frame 200. The fuel cell MEA lamination jig includes a jig body 1, wherein the jig body 1 is disposed on the side of the frame 200 away from the MEA 100. The jig body 1 is provided with a first sealing groove 11 and an active groove 12. The first sealing groove 11 is disposed around the opening of the active channel 202 and is used to engage the first seal 300. The first seal 300 can be accommodated in the first sealing groove 11. The orthographic projection of the MEA 100 located in the active channel 202 on the plane where the active groove 12 is located is located in the active groove 12. Specifically, it is suitable for laminating various types of membrane electrode assemblies, such as three-in-one, five-in-one, and seven-in-one. The membrane electrode 100 includes a proton exchange membrane and catalyst layers arranged on both sides of the proton exchange membrane. The proton exchange membrane provides a channel for the conduction of protons inside the battery. The catalyst layer is divided into an anode catalyst layer and a cathode catalyst layer, respectively located on both sides of the proton exchange membrane. The frame 200 is made of engineering plastic, and the first seal 300 is made of one of silicone, EPDM rubber, dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorosilicone rubber, or cyanosilicone rubber. The shape of the first seal 300 is one of round, square, triangular, oval, or other special shapes. The first seal 300 is snapped into the first sealing groove 11 and fixedly connected to the opening of the active channel 202 of the frame 200. The fixture body 1 is provided with a first sealing groove 11 that matches the size of the first seal 300 and an active groove 12 that matches the size of the catalyst layer or gas diffusion layer.

[0033] When the membrane electrode assembly has a single frame 200 structure, only the jig body 1 on one side of the membrane electrode assembly needs to be used for bonding. The bonding process of the membrane electrode assembly is as follows: cut out the active channel 202 in the middle position of the frame 200, place the frame 200 on the jig body 1, and make the first seal 300 snap into the first sealing groove 11 of the jig body 1. At the same time, the frame 200 is tightly fitted with the surface of the proton exchange membrane. Then, use the visual positioning software positioning system and the rolling bonding equipment to bond the jig body 1 to the membrane electrode 100, so that the proton exchange membrane slides through the active channel 202 of the frame 200, ensuring that the catalytic layer and the gas diffusion layer are not affected by external pressure during the bonding process. Finally, the shape and the conductive channel 201 of the completely bonded membrane electrode assembly are cut to obtain a sealed and complete membrane electrode assembly. The jig body 1 compensates for the height of the frame 200 during the bonding process and positions the frame 200 during the bonding process, effectively avoiding the first seal 300 from being misplaced or unevenly stressed, thereby preventing poor sealing. At the same time, it protects the first seal 300 from being deformed by pressure, and improves the processing accuracy of the membrane electrode assembly during the assembly process, thereby ensuring the consistency of the membrane electrode assembly, and is beneficial to improving the sealing performance and durability of the membrane electrode assembly, reducing the technical level requirements of workers during the production process of the membrane electrode assembly, and is beneficial to realizing automated packaging production.

[0034] Further, continue to refer to Figure 1-Figure 5 The depth of the first sealing groove 11 is greater than or equal to the thickness of the first sealing member 300, the width of the first sealing groove 11 is greater than or equal to the width of the first sealing member 300, the depth of the second sealing groove 14 is greater than or equal to the thickness of the second sealing member 400, and the width of the second sealing groove 14 is greater than or equal to the width of the second sealing member 400. Specifically, the first sealing member 300 and the second sealing member 400 are respectively fixed to the jig body 1 through the first sealing groove 11 and the second sealing groove 14, wherein the depth of the first sealing groove 11 and the second sealing groove 14 are respectively greater than or equal to the thickness of the corresponding first sealing member 300 and the second sealing member 400, and the width of the first sealing groove 11 and the second sealing groove 14 needs to be 0 to 2 mm larger than the width of the corresponding first sealing member 300 and the second sealing member 400, to ensure that the first sealing member 300 and the second sealing member 400 are respectively fixed to the jig body 1 through the first sealing groove 11 and the second sealing groove 14.

[0035] Further, continue to refer to Figure 1-Figure 5There are two jig bodies 1, and along the bonding direction of the membrane electrode assembly, a jig body 1 is provided on both sides of the membrane electrode assembly. Specifically, when the membrane electrode assembly has a double-frame 200 structure, the jig body 1 is used on both sides of the membrane electrode assembly to seal and bond the membrane electrode assembly. Optionally, the membrane electrode assembly can also be bonded in steps, first the anode frame 200 and then the cathode frame 200, or first the cathode frame 200 and then the anode frame 200, and the bonding method corresponding to the bonding equipment is one of roller pressing, hot roller pressing, flat pressing or hot flat pressing.

[0036] Further, continue to refer to Figure 1-Figure 5 The fuel cell membrane electrode assembly bonding jig also includes an adsorption assembly, which includes a negative pressure tank and an air intake pipe connected to the negative pressure tank. The jig body 1 is also provided with an adsorption hole 13, and the air intake pipe adsorbs and bonds the membrane electrode assembly to the jig body 1 through the adsorption hole 13. Specifically, the cross-sectional shape of the adsorption hole 13 is one of a serpentine, a cross-shaped, and a dot-shaped shape. The negative pressure tank provides negative pressure, one end of the air intake pipe is connected to the negative pressure tank, and the other end is aligned with the jig body 1. The air intake pipe adsorbs and bonds the jig body 1 to the membrane electrode assembly through the adsorption hole 13. There are multiple adsorption holes 13, and the multiple adsorption holes 13 are spaced apart along the circumferential direction of the jig body 1 to achieve adsorption and close bonding of the jig body 1 and the membrane electrode assembly, and the adsorption and bonding effect is good. Preferably, the frame 200 is bonded to the catalyst layer by rolling or flat pressing.

[0037] Further, continue to refer to Figure 1-Figure 5The membrane electrode assembly further includes a second seal 400, which is disposed on one side of the frame 200. The fixture body 1 further includes a second sealing groove 14, which is disposed around the opening of the conductive channel 201. The second sealing groove 14 is used to clamp the second seal 400, and the second seal 400 can be accommodated in the second sealing groove 14. Specifically, the second seal 400 is fixedly connected to the opening of the conductive channel 201 of the frame 200 through the second sealing groove 14, so that the frame 200 and the second seal 400 are combined to form a sealed frame 200. Optionally, the second seal 400 and the frame 200 are integrally formed and integrally molded by an injection molding process, with an injection temperature of less than 200°C and a curing time of 10 to 600 seconds. Optionally, the composite process of the frame 200 and the first and second sealants 300 and 400 can also be a dispensing or gluing process. The frame 200 is provided with an adhesive layer 500, which is applied to the opening of the conductive channel 201. The second sealant 400 is fixedly connected to the frame 200 via the adhesive layer 500. The material of the adhesive layer 500 is one of double-sided tape, silicone, acrylic resin, epoxy resin, polyamide, and urethane. The first sealant 300 can also be bonded and fixed to the frame 200 via the adhesive layer 500. The adhesive layer 500 is applied by pasting, spraying, coating, dispensing, and screen printing. Ensure that the first and second sealants 300 and 400 are both fixedly connected to the frame 200 and are firmly connected.

[0038] Further, continue to refer to Figure 1-Figure 5 There are multiple second sealing grooves 14, and multiple conductive channels 201. The multiple conductive channels 201 are evenly distributed on both sides of the active channel 202. The number of second sealing members 400 is the same as the number of conductive channels 201. The multiple second sealing members 400 are all arranged between the frame 200 and the jig body 1. Specifically, the frame 200 is placed on the jig body 1, so that the multiple second sealing members 400 are respectively snapped into the corresponding second sealing grooves 14 of the jig body 1 to prepare a sealing frame 200. The frame 200 is tightly fitted to the surface of the proton exchange membrane. Then, the frame 200 with the multiple second sealing members 400 is fitted to the membrane electrode assembly so that the proton exchange membrane slides through the active channel 202 to ensure that the catalytic layer and the gas diffusion layer are not affected by external pressure during the fitting process. Finally, the fully fitted membrane electrode assembly is cut to the shape and the conductive channels 201 to obtain a sealed and fully fitted membrane electrode assembly.

[0039] Further, continue to refer to Figure 1-Figure 5 The frame 200 is made of engineering plastic. Specifically, the frame 200 is made of one of PEN, PI, PET, PEEK, and PPS.

[0040] Further, continue to refer to Figure 1-Figure 5 The fixture body 1 is made of a non-metallic material. Specifically, the fixture body 1 is made of a material such as bakelite, fiberglass, acrylic glue, etc., and its shape and size are designed according to the shape and size of the frame 200. Optionally, the fixture body 1 is made of a metal material such as aluminum alloy, carbon steel, stainless steel, and sintered steel.

[0041] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A fuel cell membrane electrode assembly laminating jig for assisting the sealing lamination of a membrane electrode assembly, wherein the membrane electrode assembly comprises a membrane electrode (100), a first sealing member (300) and a frame (200), wherein the first sealing member (300) is arranged on one side of the frame (200), and the membrane electrode (100) is arranged on the other side of the frame (200), and conductive channels (201) are arranged at both ends of the frame (200), and an active channel (202) is arranged in the middle of the frame (200), characterized in that: The fuel cell membrane electrode assembly bonding jig includes: A jig body (1) is provided on a side of the frame (200) away from the membrane electrode (100), the jig body (1) is provided with a first sealing groove (11) and an active groove (12), the first sealing groove (11) is arranged around the opening of the active channel (202), the first sealing groove (11) is used to clamp the first sealing member (300), the first sealing member (300) can be accommodated in the first sealing groove (11), and the membrane electrode (100) located in the active channel (202) has its orthographic projection on the plane where the bottom of the active groove (12) is located located in the active groove (12).

2. The fuel cell membrane electrode assembly bonding jig according to claim 1, characterized in that: The depth of the first sealing groove (11) is greater than or equal to the thickness of the first sealing member (300), and the width of the first sealing groove (11) is greater than or equal to the width of the first sealing member (300).

3. The fuel cell membrane electrode assembly bonding jig according to claim 1, characterized in that: There are two jig bodies (1), and along the bonding direction of the membrane electrode assembly, the jig bodies (1) are respectively arranged on both sides of the membrane electrode assembly.

4. The fuel cell membrane electrode assembly bonding jig according to claim 1, characterized in that: The fuel cell membrane electrode assembly laminating jig further comprises an adsorption assembly, the adsorption assembly comprising a negative pressure tank and an air intake pipe connected to the negative pressure tank, the jig body (1) further comprises an adsorption hole (13), and the air intake pipe adsorbs and laminates the membrane electrode assembly to the jig body (1) through the adsorption hole (13).

5. The fuel cell membrane electrode assembly bonding jig according to claim 4, characterized in that: There are a plurality of adsorption holes (13), and the plurality of adsorption holes (13) are spaced apart along the peripheral direction of the fixture body (1). The cross-sectional shape of the adsorption holes (13) is dot-shaped, serpentine-shaped, or cross-shaped.

6. The fuel cell membrane electrode assembly laminating jig according to claim 1, wherein the membrane electrode assembly further comprises a second sealing member (400), and the second sealing member (400) is arranged on one side of the frame (200), characterized in that: The fixture body (1) is further provided with a second sealing groove (14), the second sealing groove (14) being arranged around the opening of the conducting channel (201), the second sealing groove (14) being used for clamping the second sealing member (400), and the second sealing member (400) being capable of being accommodated in the second sealing groove (14).

7. The fuel cell membrane electrode assembly bonding jig according to claim 6, characterized in that: There are multiple second sealing grooves (14), there are multiple conducting channels (201), the multiple conducting channels (201) are evenly distributed on both sides of the active channel (202), the number of the second sealing members (400) is the same as the number of the conducting channels (201), and the multiple second sealing members (400) are all arranged between the frame (200) and the fixture body (1).

8. The fuel cell membrane electrode assembly bonding jig according to claim 6, characterized in that: The depth of the second sealing groove (14) is greater than or equal to the thickness of the second sealing member (400), and the width of the second sealing groove (14) is greater than or equal to the width of the second sealing member (400).

9. The fuel cell membrane electrode assembly bonding jig according to claim 1, characterized in that: The frame (200) is made of engineering plastic.

10. The fuel cell membrane electrode assembly bonding jig according to claim 1, characterized in that: The material of the fixture body (1) is one of bakelite, glass fiber, and acrylic glue.

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