Flattening auxiliary device for proton exchange membrane of fuel cell

Abstract

The utility model discloses a fuel cell proton exchange membrane flattening auxiliary device which comprises an adsorption platform, a heating plate arranged at the bottom of the adsorption platform, a proton exchange membrane arranged on the adsorption platform, a transfer sheet arranged on the proton exchange membrane, and a positioning structure arranged on the adsorption platform. The operation is convenient, the flattening efficiency is high, and the proton exchange membrane is prevented from wrinkling.

Description

Technical Field

[0001] The utility model belongs to the technical field of membrane electrodes, and specifically relates to a fuel cell proton exchange membrane flattening auxiliary device. Background Art

[0002] The membrane electrode is the "heart" of a hydrogen fuel cell or electrolyzer and the core site for material transfer and electrochemical reactions. It is mainly composed of a catalyst, a proton exchange membrane, a frame, and a gas diffusion layer. Under the corresponding temperature and pressure, it is hot pressed into a five-in-one or seven-in-one component.

[0003] For proton exchange membranes, a 10μm or 8μm thick enhanced perfluorosulfonic acid membrane is usually used. In the sheet production process, especially when a large area of ​​proton exchange membrane is laid on a microporous adsorption platform, the proton exchange membrane after peeling off the backing film is easily electrostatically adsorbed and stuck together, making it difficult to flatten. It usually requires multiple people to cooperate to unfold the proton exchange membrane. However, since the temperature of the microporous adsorption platform is generally between 80℃ and 110℃, the proton exchange membrane quickly loses water molecules and deforms after contacting it. It is very easy to wrinkle when fixed by vacuum adsorption. Tweezers are needed to clamp the proton exchange membrane and pull to remove the wrinkles. The process is time-consuming, and the positioning of the proton exchange membrane is inconvenient when laying, and it is not easy for operators to adjust, which further prolongs the production time. Therefore, it is necessary to develop an auxiliary tooling to achieve rapid and smooth laying of the proton exchange membrane and shorten the process time.

[0004] The utility model patent with announcement number CN211885489U was published on November 10, 2020. It is named as a lithium-ion battery diaphragm extraction tank flattening device. The device includes an extraction tank roller and a flattening structure sleeved on both ends of the extraction tank roller. The flattening structure includes two semicircular rings and a fixing part for fixing the two semicircular rings. The device cannot lay the proton exchange membrane quickly and evenly, and cannot shorten the process time. Utility Model Content

[0005] The utility model aims to provide a fuel cell proton exchange membrane flattening auxiliary device which is convenient to operate, has high flattening efficiency and avoids proton exchange membrane wrinkles in view of the deficiencies in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The fuel cell proton exchange membrane flattening auxiliary device comprises an adsorption platform, a heating plate is arranged at the bottom of the adsorption platform, the proton exchange membrane is arranged on the adsorption platform, a transfer sheet is arranged on the proton exchange membrane, and a positioning structure is arranged on the adsorption platform.

[0008] The positioning structure includes a first baffle and a second baffle, wherein the first baffle is arranged at both sides of the adsorption platform, and the second baffle is arranged at one end of the adsorption platform, and both the first baffle and the second baffle are higher than the adsorption platform.

[0009] The adsorption platform is evenly distributed with adsorption holes, and the side of the adsorption platform is provided with vacuum exhaust holes, which are communicated with the adsorption holes.

[0010] A nozzle is arranged above the adsorption platform.

[0011] The first baffle plate and the second baffle plate are both provided with fastening installation holes, and the second baffle plate is provided with a handle.

[0012] The heating plate is adapted to the size of the adsorption platform, and a thermocouple mounting hole is provided on the side of the heating plate.

[0013] The adsorption platform is a square structure.

[0014] The transfer sheet has a thickness of 50 μm to 100 μm and a stiffness of 0.3 mN·cm to 2.5 mN·cm. The transfer sheet is made of PC, PPE, PET, PA, PBT or POM.

[0015] The technical effect of the utility model is as follows: the fuel cell proton exchange membrane flattening auxiliary device of the utility model is adopted, and a transfer sheet with a certain thickness and stiffness is used as a guide tool for the flat laying of the proton exchange membrane, so as to guide the proton exchange membrane to be laid flatly, and the operation is easy to realize, thereby improving the efficiency of the proton exchange membrane laying and flattening, and avoiding the deformation and wrinkling of the product; and the laying of the proton exchange membrane is positioned by multiple baffles, which facilitates the operation process, and the guiding effect of the transfer sheet and the positioning effect of the baffles realize the rapid and flat transfer of the proton exchange membrane to the adsorption platform, reduces the waiting time of man and machine, reduces the risk of sedimentation and stratification of the slurry, improves the efficiency of the CCM production on both sides of the proton exchange membrane, and brings great convenience to the MEA process research and development and pilot process development. The device has a simple structure, reasonable design, low cost, and is easy to use, and can effectively meet the spraying preparation of the proton exchange membrane coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification includes the following drawings, which show the following contents:

[0017] Figure 1 It is a structural schematic diagram of the adsorption platform of the utility model;

[0018] Figure 2 It is a schematic diagram of rapid laying of a proton exchange membrane of the utility model;

[0019] Figure 3 It is a schematic diagram of CCM manufacturing of the utility model.

[0020] Markings in the figure: 1. adsorption platform; 2. proton exchange membrane; 3. transfer sheet; 4. first baffle; 5. second baffle; 6. fastening mounting hole; 7. thermocouple mounting hole; 8. vacuum exhaust hole; 9. handle; 10. adsorption hole; 11. heating plate; 12. nozzle; 13. slurry; 14. CCM. DETAILED DESCRIPTION

[0021] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0022] like Figures 1 to 3 As shown, the fuel cell proton exchange membrane flattening auxiliary device includes an adsorption platform 1, a heating plate 11 is provided at the bottom of the adsorption platform 1, a proton exchange membrane 2 is provided on the adsorption platform 1, a transfer sheet 3 is provided on the proton exchange membrane 2, and a positioning structure is provided on the adsorption platform 1. The proton exchange membrane 2 is attached to the transfer sheet 3 by electrostatic adsorption, and the transfer sheet 3 can conveniently lay the proton exchange membrane 2 quickly and flatly on the adsorption platform 1, and then use the adsorption effect of the adsorption platform 1 to transfer the proton exchange membrane 2 flatly to the surface of the adsorption platform 1. In this process, the positioning structure is used to lay the proton exchange membrane 2 flat and position the function to reduce the difficulty of operation and improve the convenience of operation. The proton exchange membrane 2 after peeling off the back film can be quickly and flatly adsorbed and fixed on the adsorption platform 1, and will not stick together due to electrostatic adsorption. The transfer sheet 3 can be effectively flattened by removing it, avoiding the wrinkles generated during vacuum adsorption and fixation. Even for a large-area proton exchange membrane 2, the unfolding process does not require the cooperation of multiple people, which simplifies the operation steps and shortens the process time.

[0023] like Figures 1 to 3 As shown, the positioning structure includes a first baffle 4 and a second baffle 5. The first baffle 4 is arranged on both sides of the adsorption platform 1, and the second baffle 5 is arranged at one end of the adsorption platform 1. The first baffle 4 and the second baffle 5 are both higher than the adsorption platform 1. Two first baffles 4 are provided and are respectively located on both sides of the adsorption platform 1, and one second baffle 5 is provided and is located at one end of the adsorption platform 1. The two baffles block the incoming proton exchange membrane 2 in three directions. Through the restricted positioning of the proton exchange membrane 2 by the first baffle 4 and the second baffle 5, the proton exchange membrane 2 will not exceed the area of ​​the adsorption platform 1 after being placed, which is convenient for the laying and positioning of the proton exchange membrane 2. The mating surfaces of the above baffles and the adsorption platform 1 are smooth and flat, and there is no gap after installation, which ensures that the positioning of the proton exchange membrane 2 is reliable; the first baffle 4 and the second baffle 5 are both made of glass fiber reinforced composite materials, wood, carbon fiber reinforced composite materials, etc.

[0024] like Figure 1As shown, adsorption holes 10 are evenly distributed on the adsorption platform 1, and vacuum exhaust holes 8 are provided on the side of the adsorption platform 1, and the vacuum exhaust holes 8 are connected to the adsorption holes 10. The adsorption platform 1 has good thermal conductivity and is made of aluminum alloy material, graphite material and ceramic material; the adsorption platform 1 is a heating plate with a large number of mutually connected or closed pores, and the pore size of the adsorption holes 10 is very small, generally in the micron or submicron level; when in use, high-temperature tape, glass glue, polyurethane and other materials are required to seal the adsorption platform 1 around the periphery to generate better vacuum adsorption force on the upper surface; the vacuum exhaust holes 8 are connected to a vacuum pump to control the upper surface of the adsorption platform 1 to be in a negative pressure state, so as to facilitate the proton exchange membrane 2 to be fixed to the surface of the adsorption platform 1 during the CCM manufacturing process to prevent abnormal deformation; according to the characteristics and thickness of the proton exchange membrane 2 and other parameters, the vacuum degree on the surface of the adsorption platform 1 is maintained at 50kPa to 0.09mPa.

[0025] like Figure 3 As shown, a nozzle 12 is provided above the adsorption platform 1. The nozzle 12 can transfer the slurry 13 evenly to the proton exchange membrane 2, and can use a pressure drainage nozzle 12 or an ultrasonic atomization nozzle 12; in addition, the nozzle 12 can also be replaced by a slurry material transfer method such as a scraping die or a scraper; the slurry 13 is a solution dispersion form of the target coating material required for CCM production on the surface of the proton exchange membrane 2; CCM is a membrane material with a uniformly distributed coating that meets the requirements of specific uses.

[0026] like Figure 1 As shown, the first baffle plate 4 and the second baffle plate 5 are both provided with fastening and mounting holes 6, and the second baffle plate 5 is provided with a handle 9. The fastening and mounting holes 6 are provided in plurality and are arranged at equal intervals. The first baffle plate 4 and the second baffle plate 5 are fastened and connected to the adsorption platform 1 by bolts. The bolts connected by the plurality of fastening and mounting holes 6 stably mount the baffle plates on the adsorption platform 1, ensuring that they are firmly and reliably installed, and there is no gap between the baffle plates and the adsorption platform 1, thereby ensuring reliable positioning function; the handle 9 is for facilitating the forward and backward movement of the adsorption platform 1. Since the temperature of the adsorption platform 1 is usually controlled at 80°C to 110°C during the preparation of CCM, it is easy to get burned by direct contact with the hands, so the handle 9 is provided to facilitate the movement of the microporous adsorption heating platform, and the handle 9 can be made of either metal material or non-metal material, and can be designed as an integral part with the front baffle plate or assembled with the front baffle plate.

[0027] like Figure 1As shown, the size of the heating plate 11 is adapted to the adsorption platform 1, and a thermocouple mounting hole 7 is provided on the side of the heating plate 11. The above structure can ensure that the heating plate 11 can evenly transfer heat to the adsorption platform 1, ensure the uniformity of temperature, and ensure the coating preparation process yield of the product. The heating plate 11 is made of metal material, with a built-in heating element, and the heating rate is 3℃ / min~10℃ / min. A thermocouple is provided in the thermocouple mounting hole 7, which can detect the temperature of the heating plate 11 in real time.

[0028] like Figures 1 to 3 As shown, the adsorption platform 1 is a square structure. The adsorption platform 1 is made into a square shape, which is easy to process and convenient for the installation and fixation of each baffle. The distribution of the adsorption holes 10 per unit area is more uniform, and it can also adapt to the shape of the proton exchange membrane 2.

[0029] The transfer sheet 3 has a thickness of 50 μm to 100 μm and a stiffness of 0.3 mN·cm to 2.5 mN·cm. The transfer sheet 3 is made of PC, PPE, PET, PA, PBT or POM. The transfer sheet 3 is made of smooth engineering plastics such as PC, PPE, PET, PA, PBT, POM, etc., with a thickness of 50 μm to 100 μm and a stiffness of 0.3 mN·cm to 2.5 mN·cm. The transfer sheet 3 with this thickness and stiffness is not easy to bend, and has a good bonding effect with the proton exchange membrane 2, and it is also convenient for operators to separate the two. The proton exchange membrane 2 is a polymer film with a thickness of 8 μm to 15 μm. The proton exchange membrane 2 is a polymer membrane material such as PTFE, PFSA, PTFE-enhanced PFSA composite membrane, etc.

[0030] The device uses a transfer sheet 3 as a guide tool, and its plane size is not larger than the upper surface of the adsorption platform 1. The transfer sheet 3 is placed flat on the horizontal surface, and then the proton exchange membrane 2 on one side of which needs to be coated with CCM is flatly adsorbed on the surface of the transfer sheet 3 by static electricity, and the proton exchange membrane 2 is adsorbed by the transfer sheet 3 and attached to the adsorption platform 1, and then the vacuum pump is turned on to maintain a vacuum degree of 50kPa to 0.09mPa, and then the transfer sheet 3 is gradually flattened on the adsorption platform 1, and the possible air is driven away by a brush, and then the engineering plastic sheet is removed, and the proton exchange membrane 2 is firmly and flatly adsorbed on the adsorption platform 1, completing the transfer of the proton exchange membrane 2; CCM preparation can be completed on the surface of the proton exchange membrane 2 by spraying or scraping.

[0031] Embodiment 1: First, after removing the back film of a PTFE proton exchange membrane 2 with a thickness of 15 μm, the membrane is evenly transferred to the surface of a PET transfer sheet 3 with a thickness of 50 μm and a stiffness of 0.3 mN·cm. The plane size of the PET transfer sheet 3 is not larger than the upper surface of the adsorption platform 1, and the edge of the PTFE proton exchange membrane 2 is 3 mm away from the outer edge of the PET transfer sheet 3; then, the PTFE proton exchange membrane 2 is transferred and laid on the surface of the aluminum alloy adsorption platform 1 through the PET transfer sheet 3. During the transfer, the vacuum pump must be turned on first to maintain the vacuum degree of the surface of the aluminum alloy adsorption platform 1 at 50 kPa, and then the PET transfer sheet 3 is gradually flattened on the aluminum alloy adsorption platform 1, and the possible air is driven away by a brush, and then the PET transfer sheet 3 is removed, and the PTFE proton exchange membrane 2 is firmly and evenly adsorbed on the adsorption platform 1, completing the transfer of the PTFE proton exchange membrane 2; the slurry 13 is sprayed on the surface of the PTFE proton exchange membrane 2 through the pressure drainage nozzle 12 to complete the CCM preparation.

[0032] Example 2: First, after removing the back film of a PFSA proton exchange membrane 2 with a thickness of 12 μm, the membrane is transferred evenly to the surface of a PC transfer sheet 3 with a thickness of 80 μm and a stiffness of 0.6 mN·cm. Then, the PFSA proton exchange membrane 2 is transferred and laid on the surface of a graphite adsorption platform 1 through the PC transfer sheet 3. During the transfer, the vacuum pump must be turned on first to maintain the vacuum degree on the surface of the graphite adsorption platform 1 at 50 kPa. Then, the PC transfer sheet 3 is gradually flattened on the graphite adsorption platform 1, and any air that may exist is driven away with a brush. Then, the PC transfer sheet 3 is removed, and the PFSA proton exchange membrane 2 is firmly and evenly adsorbed on the graphite adsorption platform 1, completing the transfer of the PFSA proton exchange membrane 2. The slurry 13 is sprayed on the surface of the PTFE proton exchange membrane 2 by ultrasonic spraying to complete the CCM preparation.

[0033] Example 3: First, after removing the back film of the PTFE enhanced PFSA proton exchange membrane 2 with a thickness of 8 μm, transfer it evenly to the surface of the PBT transfer sheet 3 with a thickness of 50 μm and a stiffness of 2.5 mN·cm, and then transfer the PTFE enhanced PFSA proton exchange membrane 2 to the surface of the ceramic adsorption platform 1 through the PBT transfer sheet 3. During the transfer, the vacuum pump must be turned on first to maintain the vacuum degree on the surface of the ceramic adsorption platform 1 at 0.09 mPa, and then the PBT transfer sheet 3 is gradually flattened on the ceramic adsorption platform 1, and the possible air is driven away with a brush, and then the PBT transfer sheet 3 is removed, and the PTFE enhanced PFSA proton exchange membrane 2 is firmly and evenly adsorbed on the adsorption platform 1, completing the transfer of the PTFE enhanced PFSA proton exchange membrane 2; the slurry 13 is sprayed on the surface of the PTFE enhanced PFSA proton exchange membrane 2 by scraping to complete the CCM preparation.

[0034] The fuel cell proton exchange membrane flattening auxiliary device adopts a transfer sheet 3 of a certain thickness and stiffness as a guide tool for flattening the proton exchange membrane 2, guides the proton exchange membrane 2 to be flattened, is easy to operate, improves the laying and flattening efficiency of the proton exchange membrane 2, and avoids deformation and wrinkling of the product; and positions the laying of the proton exchange membrane 2 through multiple baffles, which facilitates the operation process. The guiding function of the transfer sheet 3 and the positioning function of the baffles realize the rapid and flat transfer of the proton exchange membrane 2 to the adsorption platform 1, reduces the waiting time of man-machine, reduces the risk of sedimentation and stratification of the slurry 13, improves the production efficiency of the CCM on both sides of the proton exchange membrane 2, and brings great convenience to the MEA process research and development and pilot process development. The device has a simple structure, reasonable design, low cost, and is easy to use, and can effectively meet the spraying preparation of the proton exchange membrane 2 coating.

[0035] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A fuel cell proton exchange membrane flattening auxiliary device, characterized in that: The invention comprises an adsorption platform (1), wherein a heating plate (11) is provided at the bottom of the adsorption platform (1), the proton exchange membrane (2) is arranged on the adsorption platform (1), a transfer sheet (3) is provided on the proton exchange membrane (2), and a positioning structure is provided on the adsorption platform (1).

2. The fuel cell proton exchange membrane flattening auxiliary device according to claim 1, characterized in that: The positioning structure comprises a first baffle (4) and a second baffle (5); the first baffle (4) is arranged on both sides of the adsorption platform (1); the second baffle (5) is arranged at one end of the adsorption platform (1); and both the first baffle (4) and the second baffle (5) are higher than the adsorption platform (1).

3. The fuel cell proton exchange membrane flattening auxiliary device according to claim 2, characterized in that: The adsorption platform (1) is evenly distributed with adsorption holes (10), and the side of the adsorption platform (1) is provided with vacuum exhaust holes (8), and the vacuum exhaust holes (8) are connected to the adsorption holes (10).

4. The fuel cell proton exchange membrane flattening auxiliary device according to any one of claims 1 to 3, characterized in that: A nozzle (12) is provided above the adsorption platform (1).

5. The fuel cell proton exchange membrane flattening auxiliary device according to claim 2, characterized in that: The first baffle plate (4) and the second baffle plate (5) are both provided with fastening mounting holes (6), and the second baffle plate (5) is provided with a handle (9).

6. The fuel cell proton exchange membrane flattening auxiliary device according to claim 4, characterized in that: The heating plate (11) is adapted to the size of the adsorption platform (1), and a thermocouple mounting hole (7) is provided on the side of the heating plate (11).

7. The fuel cell proton exchange membrane flattening auxiliary device according to claim 6, characterized in that: The adsorption platform (1) is a square structure.

8. The fuel cell proton exchange membrane flattening auxiliary device according to claim 1, characterized in that: The transfer sheet (3) has a thickness of 50 μm to 100 μm and a stiffness of 0.3 mN·cm to 2.5 mN·cm. The transfer sheet (3) is made of PC, PPE, PET, PA, PBT or POM.

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