Assembling device of membrane electrode group

Abstract

An assembling device of a membrane electrode assembly comprises a lower base, an adsorption end plate and an upper base which are sequentially arranged from bottom to top, the adsorption end plate provides a fixed site for a CCM fixed to a frame, the CCM is placed on the adsorption end plate in a suspended mode, the inner top of the upper base is used for being detachably connected with an upper GDL and placing the upper GDL above the CCM, and the upper GDL is detachably connected with the adsorption end plate. The lower base is used for being detachably connected with a lower GDL and placing the lower GDL below the CCM. According to the utility model, the conditions of wrinkles, uneven adsorption, uneven stress and the like of the CCM can be avoided, and the rate of finished products is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the field of membrane electrode preparation, and in particular relates to an assembling device of a membrane electrode group. Background Art

[0002] The membrane electrode assembly is the core component of the proton exchange membrane fuel cell and is an important place for electrochemical reactions to occur. The structure of the membrane electrode includes a proton exchange membrane in the middle and a cathode catalyst layer and an anode catalyst layer distributed on both sides of the proton exchange membrane. The cathode catalyst layer and the anode catalyst layer are formed by coating the corresponding catalyst slurry. Such a three-layer structure is usually called CCM (Catalyst Coated Membrane). The frame / CCM / frame structure formed by fixing the two sides of the CCM with frames is adhered to the gas diffusion layer (GDL) layer by layer to form a complete membrane electrode assembly.

[0003] Manual assembly jigs for membrane electrode groups are mostly used in situations where the number of samples required is small or for the production of membrane electrode samples needed in daily laboratories. During preparation, the gas diffusion layer, frame, and CCM need to be placed on jigs of corresponding sizes and then fitted in sequence. During this process, wrinkles, uneven adsorption, and uneven force on the CCM should be avoided. If the above conditions exist, the durability of the membrane electrode may decrease during long-term operation.

[0004] In current practical applications, gas diffusion layers of different thicknesses are usually used in the assembly process of the membrane electrode assembly, or different types of glue are selected to bond the gas diffusion layers. However, the current jigs are only compatible with gas diffusion layers of fixed thickness or gas diffusion layers that only use hot melt adhesives or pressure-sensitive adhesives, and are not compatible with multiple situations. When using different gas diffusion layers, the manual assembly jig needs to be replaced, resulting in increased preparation costs and lower efficiency.

[0005] Therefore, a jig is provided which can ensure the alignment accuracy while making the assembly process of the membrane electrode assembly more compatible and applicable to a variety of usage conditions and materials. This will not only save costs but also improve work efficiency and ensure product quality. Utility Model Content

[0006] In order to improve the deficiencies of the prior art, the utility model provides an assembly device for a membrane electrode group, which can solve at least one of the following problems: avoiding damage to the CCM, being compatible with gas diffusion layers of different thicknesses for assembly of membrane electrodes, and being compatible with the bonding of GDL with different types of glue and CCM.

[0007] A membrane electrode group assembly device comprises a lower base, an adsorption end plate and an upper base which are arranged in sequence from bottom to top, wherein the adsorption end plate is used to place a CCM fixed on a frame, the CCM is suspended on the adsorption end plate, the inner top of the upper base is used to adsorb an upper GDL, and the top of the lower base is used to place a lower GDL.

[0008] Beneficial Effects

[0009] 1. The assembly device of the membrane electrode group in the utility model includes a lower base, an adsorption end plate and an upper base. The adsorption end plate provides a fixed position for the CCM fixed on the frame. The CCM is suspended on the adsorption end plate. The inner top of the upper base is used for detachably connecting the upper GDL and placing the upper GDL above the CCM. The lower base is used for detachably connecting the lower GDL and placing the lower GDL below the CCM. When in use, the CCM fixed on the frame can be fixed on the adsorption end plate, and the CCM is suspended, thereby avoiding wrinkles, uneven adsorption, uneven force, etc. on the CCM, and effectively improving the yield rate.

[0010] 2. The assembly device of the membrane electrode group in the utility model has an upper gasket that can adjust the compressibility of the upper GDL at the lower part of the upper base, and a lower gasket that can adjust the compressibility of the lower GDL is provided on the top of the lower base. When the utility model is in use, the GDL is first placed on the lower base, and the height of the GDL is adjusted by the lower gasket so that it contacts or does not contact the bottom of the adsorption end plate, and then the CCM fixed on the frame is adsorbed on the adsorption end plate, and finally the upper GDL is adsorbed on the upper base, and the upper base is covered on the adsorption end plate, and the membrane electrode group can be assembled by pressing. Since the height of the corresponding GDL can be adjusted by the upper gasket and the lower gasket, the utility model can be compatible with GDLs of different thicknesses for bonding, ensuring that the GDL is bonded within the compressible range and preventing the GDL from being over-compressed; the CCM in the five-layer membrane electrode is located in the hollow accommodating cavity of the adsorption end plate and does not contact the adsorption hole, which can prevent the CCM from wrinkling or uneven adsorption, which affects the durability of the membrane electrode.

[0011] 3. A heating structure is provided inside the upper base and the lower base, so that it is compatible with the bonding of GDL with pressure-sensitive adhesive or hot-melt adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of an assembly device for a membrane electrode assembly;

[0013] Figure 2 is an assembly diagram of Example 2;

[0014] Figure 3 This is the assembly diagram of Example 3.

[0015] Among them, 1-upper base, 2-adsorption end plate, 3-lower base, 4-CCM fixed on the frame, 5-opening, 6-second positioning hole, 7-positioning column, 8-upper gasket, 9-lower gasket, 10-protrusion, 11-upper GDL, 12-lower GDL.

[0016] [Membrane electrode assembly device]

[0017] As described above, the utility model provides an assembly device for a membrane electrode group, including a lower base, an adsorption end plate and an upper base arranged in sequence from bottom to top, the adsorption end plate provides a fixed position for a CCM fixed on a frame, and the CCM is suspended on the adsorption end plate. The inner top of the upper base is used to detachably connect an upper GDL and place the upper GDL above the CCM, and the lower base is used to detachably connect a lower GDL and place the lower GDL below the CCM.

[0018] According to the implementation scheme of the utility model, the adsorption end plate includes a support frame and a hollow accommodating cavity formed by the support frame, the support frame is used to support the outer frame of the CCM, the CCM is located on the accommodating cavity and does not contact the support frame, and preferably the area of ​​the accommodating cavity is greater than or equal to the area of ​​the CCM.

[0019] According to the implementation scheme of the utility model, a plurality of first positioning holes are provided on the outer frame, a plurality of openings are provided at positions corresponding to the first positioning holes of the support frame, a second positioning hole is provided at positions corresponding to the openings of the upper base and the adsorption end plate, and a detachable positioning column is provided in the second positioning hole.

[0020] According to an embodiment of the present utility model, the cross-sectional dimension of the positioning column is the same as the dimension of the opening of the adsorption end plate.

[0021] As another example, the connection frame is provided with a plurality of vacuum adsorption holes for adsorbing the frame. Preferably, the vacuum adsorption holes are provided on the upper surface of the support frame. Preferably, a plurality of air holes are provided on the upper surface of the support frame.

[0022] According to the implementation scheme of the utility model, the upper base can be covered on the adsorption end plate, and an upper gasket for adjusting the compressibility of the upper GDL is arranged at the lower part of the upper base, and a lower gasket for adjusting the compressibility of the lower GDL is arranged at the top of the lower base, and the number of the upper gaskets and the lower gaskets is set according to the actual thickness requirements.

[0023] According to the implementation scheme of the utility model, two upper gaskets are arranged inside the upper base, and the two upper gaskets are distributed on two opposite sides of the upper base. The area between the two upper gaskets is used to accommodate the upper GDL, and the inner wall of the upper base is provided with a plurality of vacuum adsorption holes for adsorbing the upper gaskets and the upper GDL.

[0024] According to the implementation scheme of the utility model, the inner top of the upper base is provided with an upper GDL accommodation mark, and preferably the upper GDL accommodation area mark is obtained by drawing or etching.

[0025] According to an embodiment of the present invention, the thicknesses of the two upper gaskets are the same or different, preferably the same, and the thickness selection range of the upper gasket is within the range of the compression rate that the upper GDL can withstand.

[0026] According to the implementation scheme of the utility model, lower gaskets are distributed on both sides of the lower base, and the area between the lower gaskets is used to accommodate the lower GDL.

[0027] According to the implementation scheme of the utility model, a protrusion is arranged in the middle of the top of the lower base, the position of the protrusion corresponds to the accommodating cavity of the adsorption end plate, and the protrusion can pass through the accommodating cavity, the heating mechanism is arranged at the bottom of the protrusion, and the lower gasket is distributed on both sides of the protrusion.

[0028] According to the embodiment of the present invention, the thickness of the lower gasket is selected within the range of the compression rate that the lower GDL can withstand.

[0029] According to the implementation scheme of the utility model, an air hole is provided on the inner top of the upper base, the air hole is connected to an external vacuum pump, and the air hole is communicated with the vacuum adsorption hole to provide vacuum adsorption force for the vacuum adsorption hole.

[0030] According to the implementation scheme of the utility model, a plurality of air holes are arranged on the upper surface of the support frame of the adsorption end plate, the air holes are connected to an external vacuum pump, and the air holes are communicated with the vacuum adsorption holes to provide vacuum adsorption force for the vacuum adsorption holes.

[0031] According to the implementation scheme of the utility model, a heating mechanism is provided inside the lower base, and a heating mechanism is provided inside the upper base.

[0032] According to an embodiment of the present utility model, the heating mechanism is connected to a power source via a controller, and the controller is used to control the opening and closing and temperature of the heater. DETAILED DESCRIPTION

[0033] The structure of the present utility model will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present utility model, and should not be interpreted as limiting the scope of protection of the present utility model. All technologies implemented based on the above content of the present utility model are included in the scope of protection intended by the present utility model.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, GDL refers to a gas diffusion layer.

[0037] Example 1

[0038] See also Figure 1 As shown, an assembly device of a membrane electrode group includes an upper base 1, an adsorption end plate 2 and a lower base 3 arranged in sequence from top to bottom, a heating mechanism is arranged inside the lower base 3, a heating mechanism is arranged inside the upper base 1, the heating mechanism is connected to a power supply through a controller, the controller is used to control the opening and closing and temperature of the heater, a vacuum adsorption hole is arranged on the lower surface of the upper base 1, which is used to adsorb an upper gasket 8 and an upper GDL11, and an upper GDL11 accommodating marking line is arranged, the marking line can be obtained by drawing or etching, and its main function is to ensure the accurate positioning of the upper GDL11.

[0039] Among them, the adsorption end plate 2 is used to place the CCM4 fixed on the frame, and the CCM is suspended on the adsorption end plate. Among them, the adsorption end plate 2 includes a support frame and a hollow accommodating cavity formed by the support frame. The support frame is used to support the frame. The CCM is located on the accommodating cavity and does not contact the connecting frame. The area of ​​the accommodating cavity is greater than or equal to the area of ​​the CCM.

[0040] In this embodiment, a plurality of vacuum adsorption holes are provided on the top surface of the adsorption end plate 2 for adsorbing the CCM4 fixed on the frame. A plurality of air holes are provided on the adsorption end plate 2, which are connected to an external vacuum pump and communicated with the vacuum adsorption holes for providing vacuum adsorption force for the vacuum adsorption holes.

[0041] There are several first positioning holes on the outer frame of the CCM4 fixed on the frame, and several openings 5 ​​are provided at the positions corresponding to the first positioning holes of the support frame, and second positioning holes 6 are provided at the positions corresponding to the openings 5 ​​of the adsorption end plate of the upper base, and a detachable positioning column 7 is provided in the second positioning hole 6, and the cross-sectional size of the positioning column 7 is the same as the size of the opening 5 on the adsorption end plate 2; two upper gaskets 8 are provided inside the upper base 1, and the two upper gaskets 8 are distributed on opposite sides of the upper base 1, and the area between the two upper gaskets 8 is used to accommodate the upper GDL11, and the inner wall of the upper base 1 is provided with several vacuum adsorption holes for adsorbing the upper gaskets 8 and the upper GDL11, and the thickness selection range of the upper gasket 8 should be within the range of the compression rate that the upper GDL11 can withstand, and the inner wall of the upper base 1 is a hollow structure, and air holes are provided on the outer side of the inner wall, and the air holes are connected to the external vacuum pump, and the air holes are connected to the vacuum adsorption holes, so as to provide vacuum adsorption force for the vacuum adsorption holes.

[0042] Two lower gaskets 9 are distributed on the upper surface of the lower base 3, and the area between the two lower gaskets 9 is used to accommodate the lower GDL12. A protrusion 10 is arranged in the middle of the top of the lower base 3, and the position of the protrusion 10 corresponds to the accommodating cavity of the adsorption end plate 2, and the protrusion 10 can pass through the accommodating cavity. The heating mechanism is arranged at the bottom of the protrusion 10, and the protrusion 10 is made of heat-conducting material. The lower gaskets 9 are distributed on both sides of the protrusion 10, and the thickness selection range of the lower gasket 9 should be within the range of the compression rate that the lower GDL12 can withstand.

[0043] The thickness selection of the upper gasket 8 and the lower gasket 9 is related to the pressure required for assembly and the compressibility of the GDL (upper GDL11 or lower GDL12). Usually, the thickness is selected within the range of the compression rate that the GDL can withstand. Different thicknesses of upper gaskets 8 and lower gaskets 9 can be adjusted for use according to different models of GDL.

[0044] Example 2

[0045] When the size of GDL in the design of MEA is slightly larger than the size of the inner frame of the frame, the surface of GDL is coated with hot-melt glue. The hot-melt glue is not sticky at room temperature, but becomes sticky after heating and can be bonded to the CCM4 fixed on the frame.

[0046] See also Figure 2As shown, the lower base 3 is placed on a platform (any parallel table surface will do), and the thickness of the lower gasket 9 that needs to be placed is considered according to the compression of the lower GDL12 that needs to be achieved in the membrane electrode assembly to prevent excessive compression of the lower GDL12, and the adsorption end plate 2 is placed on the lower base, and the lower GDL12 is passed through the accommodating cavity of the adsorption end plate 2 (the surface of the lower GDL12 with glue faces the adsorption end plate 2) and placed on the protrusion 10 of the lower base 3, and the CCM4 fixed on the frame is fixed on the adsorption end plate 2. After placing it flat, turn on the vacuum pump to flatly adsorb the CCM4 fixed on the frame into the adsorption end plate 2, and the CCM of the CCM4 fixed on the frame is located on the top of the lower GDL12. Since the vacuum adsorption hole is provided on the support frame of the adsorption end plate 2, it is used to adsorb and fix it on The frame of the CCM4 on the frame and the CCM area of ​​the CCM4 fixed on the frame do not have corresponding vacuum adsorption holes, which can avoid the situation where the CCM is adsorbed and causes wrinkles on the surface and uneven adsorption; the upper GDL11 is placed at the positioning mark of the upper base 1, and the surface of the upper GDL11 with glue faces the adsorption end plate 2, and the vacuum adsorption is turned on to adsorb the upper GDL11 on the inner top of the upper base 1. At the same time, according to the compression of the upper GDL11 required for the membrane electrode assembly, the thickness of the upper gasket 8 needs to be considered to prevent excessive compression of the upper GDL11, and the heating mechanism of the upper base 1 and the lower base 2 is turned on. After the upper base 1 and the lower base 2 are heated to the required temperature, the upper base 1 is covered on the adsorption end plate 2, and the positioning column 7 is inserted. After manual pressing, the assembly of a MEA is completed.

[0047] Example 3

[0048] When the size of the GDL in the MEA design is slightly larger than the size of the inner frame, the GDL is coated with a pressure-sensitive glue that is sticky at room temperature and can bond with the five-layer membrane electrode.

[0049] See also Figure 3As shown, two lower gaskets 9 are placed on both sides of the protrusion 10 of the lower base 3, and the thickness of the lower gasket 9 is selected in relation to the pressure required for assembly and the compressibility of the lower GDL 12. The thickness of a single gasket is usually selected within the range of the compression rate that the lower GDL 12 can withstand. At the same time, the two gaskets are overlapped to make the lower GDL 12 slightly lower than the bottom of the adsorption end plate 2, to prevent the CCM 4 fixed on the frame from making initial contact with the lower GDL 12 on the lower base 3 when the CCM 4 fixed on the frame is placed, due to the stickiness of the glue on the lower GDL 12, and thus making it impossible to accurately position the CCM 4 fixed on the frame. Adjust the thickness of the lower gasket 9 according to the different thicknesses of the lower GDL12, place the lower base 3 on the platform, place the adsorption end plate 2 on the lower base 1, place the lower GDL12 on the protrusion 10 of the lower base 3 (the surface of the lower GDL12 with glue faces the adsorption end plate 2), place the CCM4 fixed on the frame on the upper surface of the adsorption end plate 2, and after placing it flat, turn on the vacuum pump to flatly adsorb the frame of the CCM4 fixed on the frame on the surface of the adsorption end plate 2. At this time, the CCM area of ​​the CCM4 fixed on the frame is located on the protrusion 10 The top of the lower GDL12 is placed on the bottom surface of the upper base 1. Since pressure-sensitive glue is used on the lower GDL12, there is no need to turn on the heating power supply. The upper GDL11 is placed at the positioning mark of the upper base 1, and the vacuum adsorption is turned on. The upper GDL11 is adsorbed on the inner top of the upper base 1. At the same time, the thickness of the upper gasket 8 needs to be placed according to the compression condition of the upper GDL11 to prevent excessive compression of the upper GDL11. The upper base 1 is covered on the adsorption end plate 2, and the lower gaskets 9 on the left and right sides of the lower base 3 are removed. After manually pressing the upper base 1, the assembly of a MEA is completed.

[0050] Example 4

[0051] When the size of the GDL in the design of the MEA is the same as the size of the inner frame of the frame, regardless of whether the GDL is coated with pressure-sensitive glue or hot-melt glue, the steps of assembling the MEA are the same as those in Example 1 or Example 2. The difference is that during assembly, the selection of the gasket thickness must also take into account the frame thickness, that is, the gasket thickness = the frame thickness + the required thickness within the compressible range of the GDL.

[0052] Example 5

[0053] In this embodiment, a plurality of fixing holes are provided on the frame, and grooves are provided at positions where the support frame corresponds to the frame, and fixing parts are provided in the grooves. When the fixing parts are inserted into the fixing hole box grooves, the frame is fixed on the support frame to connect the adsorption end plate 2 with the CCM4 fixed on the frame, and other methods are the same as those in Embodiment 1.

[0054] The above examples illustrate the specific implementation of the present invention. However, the protection scope of the present invention is not limited to the above-mentioned exemplary implementation. Any modification, equivalent substitution, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A membrane electrode assembly device, characterized in that: It includes a lower base, an adsorption end plate and an upper base which are arranged in sequence from bottom to top. The adsorption end plate provides a fixed position for the CCM fixed on the frame. The CCM is suspended on the adsorption end plate. The inner top of the upper base is used for detachably connecting the upper GDL and placing the upper GDL above the CCM. The lower base is used for detachably connecting the lower GDL and placing the lower GDL below the CCM.

2. The assembly device of the membrane electrode assembly according to claim 1, characterized in that: The adsorption end plate includes a support frame and a hollow accommodating cavity surrounded by the support frame, the support frame is used to support the outer frame of the CCM, and the CCM is located on the accommodating cavity and does not contact the support frame.

3. The assembly device of the membrane electrode assembly according to claim 2, characterized in that: The outer frame of the CCM fixed on the frame is provided with a plurality of first positioning holes, the support frame is provided with a plurality of openings corresponding to the first positioning holes, the upper base is provided with a second positioning hole corresponding to the opening of the adsorption end plate, and a detachable positioning column is provided in the second positioning hole.

4. The assembly device of a membrane electrode assembly according to any one of claims 1 to 3, characterized in that: The upper base can be covered on the adsorption end plate, an upper gasket for adjusting the compressibility of the upper GDL is arranged at the lower part of the upper base, and a lower gasket for adjusting the compressibility of the lower GDL is arranged at the top of the lower base.

5. The assembly device of the membrane electrode assembly according to claim 4, characterized in that: Two upper gaskets are arranged inside the upper base. The two upper gaskets are distributed on two opposite sides of the upper base. The area between the two upper gaskets is used to accommodate the upper GDL.

6. The assembly device of the membrane electrode assembly according to claim 5, characterized in that: The inner wall of the upper base is provided with a plurality of vacuum adsorption holes for adsorbing the upper gasket and the upper GDL.

7. The assembly device of a membrane electrode assembly according to any one of claims 1 to 3, characterized in that: The inner top of the upper base is provided with an upper GDL accommodation mark.

8. The assembly device of a membrane electrode assembly according to claim 4, characterized in that: Lower gaskets are distributed on both sides of the lower base, and the area between the two lower gaskets is used to accommodate the lower GDL.

9. The assembly device of a membrane electrode assembly according to claim 4, characterized in that: A protrusion is arranged in the middle of the top of the lower base, the position of the protrusion corresponds to the accommodating cavity of the adsorption end plate, and the protrusion can pass through the accommodating cavity, the heating mechanism is arranged at the bottom of the protrusion, and the lower gasket is distributed on both sides of the protrusion.

10. The assembly device of a membrane electrode assembly according to any one of claims 1 to 3, characterized in that: The inner top of the upper base is provided with an air hole, which is connected to an external vacuum pump and communicated with the vacuum adsorption hole to provide vacuum adsorption force for the vacuum adsorption hole.

11. The assembly device of a membrane electrode assembly according to any one of claims 1 to 3, characterized in that: A plurality of air holes are arranged on the upper surface of the support frame of the adsorption end plate, the air holes are connected to an external vacuum pump, and the air holes are communicated with the vacuum adsorption holes to provide vacuum adsorption force for the vacuum adsorption holes.

12. The assembly device of a membrane electrode assembly according to any one of claims 1 to 3, characterized in that: A heating mechanism is arranged inside the lower base, and a heating mechanism is arranged inside the upper base.

13. The assembly device of a membrane electrode assembly according to claim 12, characterized in that: The heating mechanism is connected to a power source via a controller, and the controller is used to control the opening and closing and temperature of the heater.

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