Automatic coating equipment for hydrogen battery catalyst

Abstract

The utility model relates to the technical field of hydrogen energy fuel cell core component manufacturing, and discloses hydrogen cell catalyst automatic coating equipment which comprises a box body, the interior of the box body is divided into a cleaning bin and a spraying bin through a partition plate, the cleaning bin, the spraying bin and the partition plate are each provided with a straight hole at the same height, and a diaphragm can penetrate through the straight holes. A dry ice spraying module, a PE electrostatic film dust removal module and a negative pressure recovery module are arranged in the cleaning bin; the box body is divided into the cleaning bin and the spraying bin, the through straight hole is formed, continuous integrated production of diaphragm dust removal and catalyst spraying is achieved, the dry ice spraying module directionally impacts the surface of a diaphragm at the angle of 30-45 degrees, large-particle pollutants are effectively stripped, impurities in pores are loosened, and the dust removal efficiency is improved. And meanwhile, the PE electrostatic membrane dust removal module captures free particles through non-gel electrostatic adsorption, pollutants are removed in real time in cooperation with the negative pressure recovery module, automatic dust removal and coating of the diaphragm are achieved, and the product quality is improved while the efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of manufacturing technology of core components for hydrogen fuel cells, and in particular to an automatic coating equipment for hydrogen battery catalysts. Background Technology

[0002] Against the backdrop of the global energy transition, hydrogen energy, with its zero-carbon emission characteristics, has become one of the core pathways to achieving carbon neutrality. As the core device for efficient hydrogen energy conversion, the performance of fuel cells directly depends on the manufacturing precision of the membrane electrode assembly (MEA). Specifically, the catalyst layer is uniformly loaded onto both sides of the proton exchange membrane using a precision coating process, with its thickness deviation controlled within ±1 μm.

[0003] However, in actual production, suspended particles in the workshop environment tend to adhere to the membrane surface, forming localized pollutant accumulation areas. This causes dust particles to hinder the wetting of the catalyst slurry, resulting in pinholes and cracks in the coating. In addition, pollutants may also block the proton conduction path, significantly increasing the interfacial contact resistance. Utility Model Content

[0004] To address the shortcomings of the aforementioned background technology, this utility model provides an automatic coating device for hydrogen battery catalysts.

[0005] The technical implementation scheme of this utility model is as follows: an automatic coating device for hydrogen battery catalyst, including a box body, the box body is divided into a cleaning chamber and a spraying chamber by a partition, and straight holes that allow the diaphragm to pass through are respectively opened at the same height of the cleaning chamber, the spraying chamber and the partition. Therefore, the cleaning chamber is equipped with a dry ice spraying module, a PE electrostatic membrane dust removal module and a negative pressure recovery module. The spraying angle of the dry ice spraying module is between 30-45°. The spraying chamber is equipped with a catalyst spraying machine.

[0006] Furthermore, the PE electrostatic film dust removal module includes a roller frame, a telescopic cylinder, a front support roller, a rear support roller, and a winding mechanism. The rear end of the telescopic cylinder is located at the inner top of the cleaning chamber, and the front end of the telescopic cylinder is vertically downward and equipped with a U-shaped bracket. The roller frame is hinged to the U-shaped bracket by a pin. The two ends of the roller frame have open shaft holes for installing PE film rollers. The front support roller and the rear support roller are located on both sides of the roller frame. The winding mechanism is located at the outer top of the cleaning chamber, and the top of the cleaning chamber has a vertical hole.

[0007] Furthermore, the winding mechanism includes a first winding roller, a second winding roller, and a drive motor. The first winding roller and the second winding roller are connected by a pulley drive, and the drive motor is connected to either the first winding roller or the second winding roller drive.

[0008] Furthermore, the distance between the dry ice nozzle and the PE film roller is 10-15cm.

[0009] Furthermore, the dry ice particles have a diameter between 10-50 μm, and the pressure of the dry ice injection module is between 0.5-0.8 MPa.

[0010] This utility model has the following advantages:

[0011] 1. This utility model divides the box into a cleaning chamber and a spraying chamber and sets through straight holes, realizing continuous integrated production of diaphragm dust removal and catalyst spraying. The dry ice spraying module impacts the diaphragm surface at a 30-45° angle, effectively removing large particulate pollutants and loosening impurities in the pores. At the same time, the PE electrostatic membrane dust removal module captures free particles with glue-free electrostatic adsorption, and the negative pressure recovery module removes pollutants in real time, realizing automatic dust removal and coating of the diaphragm, improving efficiency and product quality.

[0012] 2. The PE electrostatic film dust removal module of this utility model uses a telescopic cylinder to drive a U-shaped bracket and a hinged roller frame, which realizes dynamic adjustment of the contact pressure between the PE film roller and the diaphragm. While avoiding mechanical damage to the ultra-thin diaphragm, the tension closed loop formed by the front and rear rollers ensures that the PE film and the diaphragm surface are evenly bonded. The open shaft hole design supports quick replacement of PE film rolls. Combined with the vertical hole at the top of the cleaning chamber and the external winding mechanism, it realizes the directional recycling of contaminated PE film and avoids secondary contamination of the diaphragm by the electrostatic film.

[0013] In addition, the first and second take-up rollers can be used together to recycle contaminated PE film and PE protective film, respectively.

[0014] 3. The distance between the dry ice nozzle and the PE film roller in this utility model is 10-15cm. By precisely controlling the spatial relationship between the dry ice spray trajectory and the electrostatic adsorption field, the free particles generated after the dry ice particles impact are instantly captured under the action of the electrostatic field of the PE film. At the same time, this distance matches the airflow coverage of the negative pressure recovery module to ensure that sublimated CO2 gas and detached pollutants are efficiently extracted.

[0015] 4. This invention uses dry ice particles with a particle size of 10-50μm, achieving an optimal balance between kinetic energy impact and low-temperature embrittlement effect. Particles in this range have sufficient momentum to strip away contaminants, while a pressure range of 0.5-0.8MPa ensures that the dry ice particles are accelerated to the critical cleaning speed of 200-300m / s, while preventing excessive pressure from causing local deformation of the diaphragm. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the PE electrostatic film dust removal module of this utility model.

[0018] Figure 3This is a partial schematic diagram of the present invention.

[0019] In the attached diagrams: 1: Box body, 2: Partition plate, 3: Cleaning chamber, 4: Spraying chamber, 5: Straight hole, 6: Proton exchange membrane, 7: Dry ice spraying module, 8: PE electrostatic membrane dust removal module, 801: Roller frame, 802: Pin shaft, 803: U-shaped bracket, 804: Telescopic cylinder, 805: PE membrane roller, 806: Front support roller, 807: Rear support roller, 808: Winding mechanism, 809: First winding roller, 810: Second winding roller, 811: Servo drive motor, 812: Synchronous pulley, 9: Negative pressure recovery module, 10: Catalyst spraying machine. Detailed Implementation

[0020] References to embodiments herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] like Figure 1 As shown, the automatic coating equipment for hydrogen battery catalysts of this invention includes a housing 1, which is internally divided into a cleaning chamber 3 and a spraying chamber 4 by a partition 2. Straight holes 5 are formed at the same horizontal level in the cleaning chamber 3, the spraying chamber 4, and the partition 2 for through-transfer of the proton exchange membrane 6.

[0022] Cleaning chamber 3 is equipped with:

[0023] Dry ice injection module 7: The injection angle is preferably 35° (between 30-45°), and the nozzle axis is inclined to the surface of the diaphragm 6;

[0024] PE electrostatic membrane dust removal module 8: Located downstream of the dry ice spray module, it is used to adsorb residual particles;

[0025] Negative pressure recovery module 9: Recovers pollutants through the top suction port.

[0026] A catalyst spraying machine 10 is installed inside the spraying chamber 4 to coat the catalyst layer on the surface of the diaphragm 6.

[0027] Work process: The diaphragm 6 passes through the dry ice spray, PE membrane adsorption and negative pressure recovery in the cleaning chamber 3 in sequence, and then enters the spraying chamber 4 to complete the catalyst coating.

[0028] In a preferred embodiment, refer to Figure 2 The PE electrostatic film dust removal module 8 includes:

[0029] Telescopic cylinder 804: It is vertically fixed at the top of the cleaning chamber 3. Its front end is hinged to the roller frame 801 through the U-shaped bracket 803. The angle of the roller frame 801 can be adjusted through the pin 802. Open shaft holes are opened at both ends of the roller frame 801 to install the PE film roller 805. The PE film roller 805 can be replaced at any time.

[0030] Front idler roller 806 and rear idler roller 807: located on both sides of roller frame 801 respectively, used to guide the PE film 11 to contact the surface of the diaphragm 6 and to guide the recycling of PE film and PE film protective film.

[0031] Rewinding mechanism 808: Located on the top of the cleaning chamber 3, and connected to the internal roller frame 801 through the vertical hole on the top of the cleaning chamber.

[0032] The telescopic cylinder 804 adjusts the height of the roller frame 801, and the pin 802 adjusts the angle of the roller frame 801 so that the PE film roller 805 contacts the surface of the diaphragm 6 with controllable pressure. The front and rear support rollers maintain the tension of the PE film, and the winding mechanism 808 continuously recycles the used PE film.

[0033] In addition, the winding mechanism 808 includes a first winding roller 809, a second winding roller 810, and a drive motor 811. The two winding rollers are synchronously driven by a pulley 812, and the drive motor 811 is connected to the second winding roller 810. The first winding roller 809 and the second winding roller 810 cooperate to recycle PE film and PE film protective film.

[0034] refer to Figure 3 The distance between the nozzle of the dry ice jet module 7 and the PE membrane roller 805 is set to 12cm (between 10-15cm). This distance ensures that after the dry ice particles impact the diaphragm 6, the free pollutants are within the electrostatic adsorption range of the PE membrane, while the airflow of the negative pressure recovery module 9 effectively covers this area to prevent pollutants from escaping.

[0035] In addition, the dry ice spraying module 7 uses dry ice particles with a diameter of 10-50 μm, and the spraying pressure is set to 0.6 MPa (between 0.5-0.8 MPa). Under these parameters, the dry ice particles can effectively remove contaminants from the surface and pores of the diaphragm while avoiding damage to the diaphragm structure.

[0036] The actual application scenarios of this device:

[0037] In one specific embodiment, this equipment is used in a hydrogen fuel cell production line to process proton exchange membranes with a thickness of 15-50 μm.

[0038] 1. Cleaning stage: Dry ice particles impact the membrane surface at an angle of 30-45° to remove large particulate contaminants; the PE membrane captures residual particles through electrostatic adsorption; the negative pressure module recovers fallen impurities in real time.

[0039] 2. Spraying stage: The cleaned diaphragm enters the spraying chamber 4, and the catalyst spraying machine 10 evenly coats the catalyst layer.

[0040] Through the synergistic effect of dry ice blasting and PE membrane adsorption, the removal rate is >99%; there is no gum residue, the membrane pore permeability remains >95%; the catalyst coating thickness deviation is <1μm, and the battery power density fluctuation range is ±3%.

[0041] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the inventive concept, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A hydrogen battery catalyst automatic coating apparatus characterized by, The utility model relates to a kind of dry ice cleaning and spraying machine, including box (1), the box (1) is separated into cleaning bin (3) and spraying bin (4) by partition (2), the same height of the cleaning bin (3), spraying bin (4) and partition (2) is respectively opened to allow diaphragm to pass straight hole (5), so cleaning bin (3) is equipped with dry ice injection module (7), PE electrostatic membrane dust removal module and negative pressure recovery module (9), the injection angle of the dry ice injection module (7) is between 30-45 °, and spraying bin (4) is provided with catalyst spraying machine (10).

2. The hydrogen battery catalyst auto-coating apparatus of claim 1, wherein, The PE electrostatic membrane dust removal module includes roller frame (801), telescopic cylinder (804), front roller (806), rear roller (807) and winding mechanism (808), the rear end of telescopic cylinder (804) is arranged at the inner top of cleaning bin (3), the front end of telescopic cylinder (804) is vertically downward and is equipped with U-shaped support (803), the roller frame (801) is hinged on U-shaped support (803) by pin shaft (802), the both ends of the roller frame (801) are provided with open shaft hole for installing PE film roller (805), the front roller (806) and rear roller (807) are located at the both sides of roller frame (801), and the winding mechanism (808) is arranged at the outer top of cleaning bin (3), and the top of the cleaning bin (3) is provided with vertical hole.

3. The hydrogen battery catalyst auto-coating apparatus of claim 2, wherein, The winding mechanism (808) includes first winding roller (809), second winding roller (810) and drive motor, the first winding roller (809) and second winding roller (810) are connected by belt wheel transmission, and the drive motor is connected with the first winding roller (809) or second winding roller (810) transmission.

4. The hydrogen battery catalyst auto-coating apparatus of claim 3, wherein, The nozzle of the dry ice injection module (7) is spaced apart from the PE film roller (805) by 10-15cm.

5. The hydrogen cell catalyst auto-coating apparatus according to any one of claims 1 to 4, characterized by, The dry ice injection module (7) uses dry ice particles with a particle size of 10-50 μm, and the pressure of the dry ice injection module (7) is between 0.5-0.8MPa.

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