Fuel cell membrane electrode proton membrane coating system

Abstract

The utility model provides a fuel cell membrane electrode proton membrane coating system. The fuel cell membrane electrode proton membrane coating system comprises a metal bottom plate, a slit coating machine and a positioning module, the metal bottom plate is used for placing a proton membrane of a fuel cell membrane electrode; the slit coating machine is used for coating catalyst slurry on the proton membrane according to preset working parameters when the slit coating machine is started to form a coating; and the positioning module is used for positioning the initial position of the proton membrane placed on the metal bottom plate. According to the fuel cell membrane electrode proton membrane coating system provided by the invention, the problem of coating dislocation of a double-sided slit coating method can be solved, and the utilization rate of catalyst slurry is improved.

Description

Technical Field

[0001] The present application relates to the field of fuel cells, and in particular to a fuel cell membrane electrode proton membrane coating system. Background Art

[0002] The fuel cell membrane electrode is the core power generation element of the fuel cell and is a key factor in determining the output performance, life and cost of the entire fuel cell system. Usually, the membrane electrode as a component structure is mainly composed of a three-in-one coated membrane (catalyst layer coated on both sides of the proton exchange membrane), a five-in-one sealing frame, and a seven-in-one cathode / anode carbon paper (diffusion layer). Among them, the proton exchange membrane, as the three-in-one core component, is an important channel for the flow and exchange of hydrogen ions between the two poles, while the catalyst coating promotes the redox reaction of the gas in the membrane electrode.

[0003] The three-in-one coating is usually made by ultrasonic spraying, high-temperature transfer and slit coating. Different coating methods are used on both sides of the proton membrane according to the characteristics of the cathode and anode, such as ultrasonic spraying and high-temperature transfer, slit coating and ultrasonic spraying, and slit coating combined with high-temperature transfer. However, the conversion of different coating methods will lead to low efficiency of membrane electrode production. Taking the anode as an example, the anode is slit coated and the cathode is ultrasonic sprayed. The amount of slurry used in ultrasonic spraying (between 20-30ml) and the processing method (long-term mechanical stirring and temperature-unstable ultrasonic crushing) are completely different from the amount of slurry used in slit coating (200-300ml) and the processing method (high-speed shearing and degassing). The disadvantage of combining slit coating with high-temperature transfer is that the latter consumes a lot of electricity when the hot press is turned on during the processing, and the long-term high temperature environment will also destroy the stability of the slit direct coating.

[0004] At present, in order to avoid the above defects and ensure the stability of the finished product, the same coating method is used on both sides of the coating. However, the existing double-sided slit coating will cause the coating on both sides to be misaligned, thereby wasting slurry and reducing utilization. Utility Model Content

[0005] In response to the above problems, the present application provides a fuel cell membrane electrode proton membrane coating system, which can solve the problem of coating misalignment in the double-sided slit coating method and improve the utilization rate of catalyst slurry.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a fuel cell membrane electrode proton membrane coating system, comprising: a metal base plate, a slit coater, and a positioning module;

[0008] The metal base plate is used to place the proton membrane of the fuel cell membrane electrode;

[0009] The slit coater is used to coat the catalyst slurry on the proton membrane according to preset working parameters when started to form a coating;

[0010] The positioning module is used to locate the initial position of the proton membrane placed on the metal base plate.

[0011] In a possible implementation, the fuel cell membrane electrode proton membrane coating system further includes: a humidification module;

[0012] The humidification module is connected to the controller of the slit coater and is used to be turned on when the slit coater finishes coating to increase the air humidity.

[0013] In a possible implementation, the surface of the metal bottom plate has sulfuric acid paper.

[0014] In a possible implementation, the slit coater includes: a coating die head and a feed pipe;

[0015] The coating die head has a feed port, one end of the feed pipe is connected to the feed port, and the other end is connected to the feed tank of the slit coater.

[0016] In a possible implementation, the positioning module is a laser positioning device.

[0017] In a possible implementation, the fuel cell membrane electrode proton membrane coating system further includes: a catalyst slurry mixing module; the catalyst slurry mixing module includes: a stirring device, an ultrasonic device, a high-speed shearing device, and a degassing device;

[0018] The stirring device is used to stir the raw materials of the catalyst slurry to obtain a first slurry and transport it to the ultrasonic device;

[0019] The ultrasonic device is used to ultrasonically mix the first slurry to obtain a second slurry and transport it to the high-speed shear device;

[0020] The high-speed shearing device is used to perform high-speed shearing on the second slurry to obtain a third slurry and transport it to the degassing device;

[0021] The degassing device is used to degas the third slurry to obtain catalyst slurry.

[0022] In a possible implementation, the slit coater further includes: a vacuum stirring mechanism and a degassing mechanism;

[0023] The vacuum stirring mechanism is used to vacuum stir the catalyst slurry and transport it to the degassing mechanism;

[0024] The degassing mechanism is used to degas the catalyst slurry after vacuum stirring, and transport it to the feed port of the coating die head through the feed pipe according to the preset working parameters.

[0025] In a possible implementation, the thickness of the proton membrane includes: 5 μm, 8 μm, 12 μm, 15 μm, and 18 μm.

[0026] In a possible implementation, the coating includes: an anode coating and a cathode coating.

[0027] The fuel cell membrane electrode proton membrane coating system provided in the present application can solve the problems of non-overlapping of the coatings on both sides and cracking of the coatings when coating the proton membrane using the double-sided slit coating method, thereby obtaining a three-in-one coating membrane with strong coating stability and high overlap, thereby improving the utilization rate of the catalyst slurry and the production efficiency of the three-in-one coating membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0029] Figure 1 A schematic structural diagram of a fuel cell membrane electrode proton membrane coating system provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of a fuel cell membrane electrode proton membrane and a metal base plate provided in an embodiment of the present application;

[0031] Figure 3 A schematic structural diagram of a fuel cell membrane electrode proton membrane coating system positioning module provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the structure of a fuel cell membrane electrode proton membrane provided in an embodiment of the present application.

[0033] Figure numerals: 1-metal base plate; 2-positioning module; 3-proton membrane; 4-coating, 41-anode coating, 42-cathode coating; 5-humidification module; 6-coating die, 61-feeding port; 7-feeding pipe. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] Example 1

[0037] Figure 1-3 A fuel cell membrane electrode proton membrane coating system provided in an embodiment of the present application includes: a metal base plate 1, a slit coater, and a positioning module 2;

[0038] The metal base plate 1 is used to place the proton membrane 3 of the fuel cell membrane electrode;

[0039] The slit coater is used to coat the catalyst slurry on the proton membrane 3 according to preset working parameters when started to form a coating 4;

[0040] The positioning module 2 is used to locate the initial position of the proton membrane 3 placed on the metal base plate 1 .

[0041] In a possible implementation, the fuel cell membrane electrode proton membrane coating system further includes: a humidification module 5;

[0042] The humidification module 5 is connected to the controller of the slot coater and is used to be turned on when the slot coater finishes coating to increase the air humidity.

[0043] Wherein, the humidification module 5 is a controllable humidity humidifier, which is used to control the drying speed of the coating.

[0044] In a possible implementation manner, the surface of the metal base plate 1 has sulfuric acid paper.

[0045] In a possible implementation, the slit coater includes: a coating die 6, a feed pipe 7;

[0046] The coating die head 6 has a feed port 61 , one end of the feed pipe 7 is connected to the feed port 61 , and the other end is connected to the feed tank of the slit coater.

[0047] Optionally, there are two feed ports, feed pipes and feed tanks, which are used to load the anode catalyst and the cathode catalyst respectively.

[0048] In a possible implementation, the positioning module 2 is a laser positioning device.

[0049] Wherein, the laser positioning device is a plurality of infrared laser transmitters, which obtain the initial position of the proton membrane through infrared laser.

[0050] In a possible implementation, the fuel cell membrane electrode proton membrane coating system further includes: a catalyst slurry mixing module; the catalyst slurry mixing module includes: a stirring device, an ultrasonic device, a high-speed shearing device, and a degassing device;

[0051] The stirring device is used to stir the raw materials of the catalyst slurry to obtain a first slurry and transport it to the ultrasonic device;

[0052] The ultrasonic device is used to ultrasonically mix the first slurry to obtain a second slurry and transport it to the high-speed shear device;

[0053] The high-speed shearing device is used to perform high-speed shearing on the second slurry to obtain a third slurry and transport it to the degassing device;

[0054] The degassing device is used to degas the third slurry to obtain catalyst slurry.

[0055] Among them, the raw materials of the catalyst slurry include: anode catalyst slurry raw materials and cathode catalyst slurry raw materials; the anode catalyst slurry raw materials include: carbon-supported platinum, ionomer perfluorosulfonic acid resin dispersion, isopropanol, and deionized water; the cathode catalyst slurry raw materials include: carbon-supported platinum, ionomer perfluorosulfonic acid resin dispersion, isopropanol, and deionized water.

[0056] In a possible implementation, the slit coater further includes: a vacuum stirring mechanism and a degassing mechanism;

[0057] The vacuum stirring mechanism is used to vacuum stir the catalyst slurry and transport it to the degassing mechanism;

[0058] The degassing mechanism is used to degas the catalyst slurry after vacuum stirring, and transport it to the feed port 61 of the coating die head 6 through the feed pipe 7 according to the preset working parameters.

[0059] Wherein, the vacuum stirring mechanism and the degassing mechanism are located in the feed tank.

[0060] In a possible implementation manner, the thickness of the proton membrane 3 includes: 5 μm, 8 μm, 12 μm, 15 μm, and 18 μm.

[0061] In a possible implementation, the coating 4 includes: an anode coating 41 and a cathode coating 42 .

[0062] Working principle:

[0063] The raw materials of the anode / cathode catalyst slurry are added to the catalyst slurry mixing module, first mixed and stirred by a stirring device, ultrasonically treated by an ultrasonic device after stirring, and then sheared at high speed by a high-speed shearing device. After shearing, degassing treatment is carried out for 3 minutes, and the treated anode / cathode catalyst slurry is sent to the feed tank of the slit coater.

[0064] Lay the proton membrane flat on the metal base plate, turn on the positioning module to obtain the initial position of the proton membrane, turn on the slit coater, and perform vacuum stirring and degassing treatment on the anode / cathode catalyst slurry in the feed tank for 10 minutes. Then, according to the set coating delay, temperature, gap and thickness parameters, coat the anode / cathode catalyst slurry on the proton membrane to form an anode / cathode coating. After stopping the coating, turn on the humidification module, mark and save the proton membrane of the anode / cathode coating.

[0065] Replace the anode / cathode catalyst slurry in the feed tank with the cathode / anode catalyst slurry. The cathode / anode catalyst slurry is also mixed through the catalyst slurry mixing module. After the anode / cathode coating is completely dry, turn over the proton membrane with single-sided coating and lay it flat on the initial position of the proton membrane obtained by the positioning module. Start the slit coater and coat the proton membrane according to preset parameters to form the anode / cathode coating. After stopping the coating, start the humidification module, mark and save the proton membranes of the anode coating and cathode coating, and wait for the cathode / anode coating to be completely dry.

[0066] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0067] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A fuel cell membrane electrode proton membrane coating system, characterized in that: include: Metal base plate (1), slit coater, positioning module (2); The metal base plate (1) is used to place the proton membrane (3) of the fuel cell membrane electrode; The slit coating machine is used to coat the catalyst slurry on the proton membrane (3) according to preset working parameters when started to form a coating (4); The positioning module (2) is used to locate the initial position of the proton membrane (3) placed on the metal base plate (1).

2. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: Also includes: Humidification module (5); The humidification module (5) is connected to the controller of the slit coater and is used to be turned on when the slit coater finishes coating to increase the air humidity.

3. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: The surface of the metal bottom plate (1) is provided with sulfuric acid paper.

4. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: The slit coating machine comprises: a coating die head (6) and a feed pipe (7); The coating die head (6) has a feed port (61), one end of the feed pipe (7) is connected to the feed port (61), and the other end is connected to the feed tank of the slit coater.

5. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: The positioning module (2) is a laser positioning device.

6. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: Also includes: Catalyst slurry mixing module; The catalyst slurry mixing module includes: a stirring device, an ultrasonic device, a high-speed shearing device, and a degassing device; The stirring device is used to stir the raw materials of the catalyst slurry to obtain a first slurry and transport it to the ultrasonic device; The ultrasonic device is used to ultrasonically mix the first slurry to obtain a second slurry and transport it to the high-speed shear device; The high-speed shearing device is used to perform high-speed shearing on the second slurry to obtain a third slurry and transport it to the degassing device; The degassing device is used to degas the third slurry to obtain catalyst slurry.

7. The fuel cell membrane electrode proton membrane coating system according to claim 4, characterized in that: The slit coating machine further comprises: a vacuum stirring mechanism and a degassing mechanism; The vacuum stirring mechanism is used to vacuum stir the catalyst slurry and transport it to the degassing mechanism; The degassing mechanism is used to degas the catalyst slurry after vacuum stirring, and transport it to the feed port (61) of the coating die head (6) through the feed pipe (7) according to the preset working parameters.

8. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: The thickness of the proton membrane (3) includes: 5 μm, 8 μm, 12 μm, 15 μm, and 18 μm.

9. The fuel cell membrane electrode proton membrane coating system according to claim 1, characterized in that: The coating (4) comprises: an anode coating (41) and a cathode coating (42).

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