CN111146450A - Device and method for continuously preparing gas diffusion layer of fuel cell - Google Patents
Device and method for continuously preparing gas diffusion layer of fuel cell Download PDFInfo
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- CN111146450A CN111146450A CN201911367629.9A CN201911367629A CN111146450A CN 111146450 A CN111146450 A CN 111146450A CN 201911367629 A CN201911367629 A CN 201911367629A CN 111146450 A CN111146450 A CN 111146450A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
- H01M4/8807—Gas diffusion layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/12—Machines with auxiliary equipment, e.g. for drying printed articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/40—Inking units
- B41F15/42—Inking units comprising squeegees or doctors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Fuel Cell (AREA)
Abstract
The invention belongs to the technical field of fuel cells, and discloses a device and a method for continuously preparing a gas diffusion layer of a fuel cell. The device comprises a feeding end conveyor belt, a raw material carbon paper support and a feeding end conveying device, wherein the raw material carbon paper is continuously conveyed from the raw material carbon paper support through the driving of a first motor; the screen printing machine is used for coating to obtain microporous layer carbon paper; the blanking end conveyor belt runs under the drive of a second motor and continuously conveys microporous carbon paper to sequentially pass through the vacuum oven and the high-temperature atmosphere oven to obtain a gas diffusion layer and wind the gas diffusion layer; the feeding end conveyor belt is connected with a first vacuum pump, and the discharging end conveyor belt is connected with a second vacuum pump; the synchronous controller controls the first motor and the second motor to start and stop synchronously. According to the invention, the feeding end conveyor belt and the discharging end conveyor belt are respectively connected with the first vacuum pump and the second vacuum pump to provide vacuum adsorption, so that the stable and continuous conveying of the raw material carbon paper is ensured; the synchronous start and stop of the first motor and the second motor are beneficial to accelerating the production beat and realizing the continuous coating of the raw material carbon paper.
Description
Technical Field
The invention relates to the technical field of new energy fuel cells, in particular to a device and a method for continuously preparing a gas diffusion layer of a fuel cell.
Background
Fuel cells are becoming an ideal energy utilization method because of high energy conversion efficiency, no noise and no pollution, but the durability and high cost of fuel cells are a major bottleneck restricting the commercialization development of fuel cells. The membrane electrode of fuel cell is the core component of fuel cell stack, and is composed of proton exchange membrane, catalyst and gas diffusion layer. The gas diffusion layer plays the roles of electronic conduction, current collection, gas guide, water drainage and membrane electrode support. The main factors currently affecting the development of gas diffusion layers are cost and process.
The gas diffusion layer of the fuel cell is composed of a hydrophobic layer and a microporous layer. The hydrophobic layer substrate material needs to have electron conductivity, needs to have a loose porous structure easy for gas conduction, needs to have the characteristics of water guiding and the like, and usually adopts graphitized carbon paper, carbon fiber paper, graphitized carbon cloth or the like as the main hydrophobic layer material of the gas diffusion layer. Of which carbon fiber paper is most widely used. The microporous layer is prepared by uniformly coating conductive carbon black on the surface of hydrophobic carbon fiber paper and sintering and curing at high temperature. The coating modes comprise screen printing, electrostatic spinning, spray printing and brush coating and coating film forming, wherein the screen printing mode is most widely applied. The microporous layer slurry is printed on the carbon fiber paper through a screen printing plate in a blade coating mode, the screen printing mode is from the traditional printing technology, and the aim of controlling the printing thickness of the microporous layer slurry is fulfilled by adjusting the mesh number and the thickness of the screen printing plate.
However, the main reason why the screen printing method for coating the gas diffusion layer cannot be commercially used is that the manufacturing process is not continuous. Because the screen printer is influenced by the size of the screen plate, the screen printer can only print on a fixed size, and the hydrophobic layer raw material carbon paper needs to be replaced manually or manually, so how to improve the preparation production rhythm of the gas diffusion layer is a difficult point needing to be broken through at the present stage.
Disclosure of Invention
The invention aims to provide a device and a method for continuously preparing a gas diffusion layer of a fuel cell, which aim to solve the problem of continuously preparing the gas diffusion layer of the fuel cell.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for continuously preparing a gas diffusion layer for a fuel cell, the apparatus comprising:
the feeding end conveyor belt is driven by a first motor to continuously convey the raw material carbon paper from the raw material carbon paper support; the feeding end conveyor belt is connected with a first vacuum pump;
the screen printer is arranged at the tail end of the feeding end conveying belt and is used for coating the raw material carbon paper to obtain microporous layer carbon paper;
the blanking end conveying belt is arranged at the output end of the screen printing machine, a vacuum oven and a high-temperature atmosphere oven are sequentially arranged on the blanking end conveying belt, and the blanking end conveying belt is driven by a second motor to convey the microporous layer carbon paper to sequentially pass through the vacuum oven and the high-temperature atmosphere oven so as to obtain a gas diffusion layer; the blanking end conveyor belt is connected with a second vacuum pump;
the winding machine is arranged at the tail end of the blanking end conveyor belt and used for winding the gas diffusion layer;
and the synchronous controller controls the first motor and the second motor to be started and stopped synchronously.
Optionally, the feeding end conveyor belt is fixed on the feeding end conveying support, the feeding end conveyor belt is a first double-layer crawler belt with vacuumizing holes formed in the surface, and the first double-layer crawler belt is connected with the first vacuum pump.
Optionally, the blanking end conveyor belt is supported on the blanking end conveyor support, the blanking end conveyor belt is a second double-layer crawler belt with vacuumizing holes formed in the surface, and the second double-layer crawler belt is connected with the second vacuum pump.
Optionally, the screen printer comprises:
the workbench is arranged below the running plane of the raw material carbon paper and has two states of ascending and descending, the workbench is in the descending state when the raw material carbon paper moves on the production line, and the workbench ascends to be in contact with the raw material carbon paper and adsorbs the raw material carbon paper in vacuum when the raw material carbon paper is static on the production line;
the third vacuum pump is connected with the workbench, and the workbench is vacuumized after being lifted so as to adsorb the raw material carbon paper on the surface of the workbench;
the screen plate is arranged above the running plane of the raw material carbon paper, can descend along the screen support and is attached to the raw material carbon paper on the workbench;
the automatic feeding tank is arranged above the running plane of the raw material carbon paper and can descend to the silk screen plate along the silk screen bracket to provide microporous layer slurry;
an insulating ink coating knife arranged above the running plane of the raw material carbon paper and capable of descending along the screen support to the screen plate to coat the microporous layer slurry;
the working position camera is arranged on the screen support, is positioned at the input end of the screen printer and is used for detecting whether the raw material carbon paper is positioned or not and sending a positioning signal to the synchronous controller;
the calibration camera is arranged on the screen support and positioned at the output end of the screen printing machine, and when the cross-connecting lines before and after coating on the raw carbon paper are aligned with the edge of the workbench at the output end, the calibration camera sends a calibration signal to the synchronous controller;
and after receiving the in-place signal and the calibration signal at the same time, the synchronous controller synchronously controls the first motor and the second motor to stop.
Optionally, the vacuum degree of the vacuum oven is 0.1 Mpa.
Optionally, the high-temperature atmosphere oven is a nitrogen-filled high-temperature oven, and the temperature is 350 ℃.
Optionally, the first vacuum pump and the second vacuum pump respectively control the vacuum degree range of the feeding end conveying belt and the vacuum degree range of the discharging end conveying belt to be 0.05-0.15Mpa, and the third vacuum pump controls the vacuum degree range of the workbench to be 0.25-0.35 Mpa.
The present invention also provides a method for continuously preparing a gas diffusion layer for a fuel cell using the apparatus for continuously preparing a gas diffusion layer for a fuel cell, the method comprising the steps of:
s1, the synchronous controller synchronously controls the first motor and the second motor to respectively drive the feeding end conveyor belt and the discharging end conveyor belt to operate, and the feeding end conveyor belt and the discharging end conveyor belt simultaneously start vacuum adsorption to continuously convey raw material carbon paper;
s2, after the raw material carbon paper is continuously conveyed by the feeding end conveyor belt into the screen printing machine and is in place, the synchronous controller synchronously controls the first motor and the second motor to stop running, and the raw material carbon paper is coated in the screen printing machine to obtain the microporous layer carbon paper;
s3, after the coating is finished, the synchronous controller synchronously controls the first motor and the second motor to operate again; the blanking end conveyor belt continuously conveys the microporous carbon paper to leave the screen printing machine and sequentially passes through the vacuum oven and the high-temperature atmosphere oven for drying to obtain a gas diffusion layer, and the gas diffusion layer is wound;
s4, repeating the steps S1-S3, and continuously preparing the gas diffusion layer.
Alternatively, the in-place in step S2 is detected by:
the working position camera detects the in-place of the raw material carbon paper and sends the in-place signal to the synchronous controller, the calibration camera detects the calibration of the cross-over line before and after the raw material carbon paper is coated and sends the calibration signal to the synchronous controller, and the synchronous controller synchronously controls the first motor and the second motor to stop after receiving the in-place signal and the calibration signal simultaneously.
Optionally, the coating is performed periodically.
The invention has the beneficial effects that:
(1) in consideration of the factors of high tensile strength and poor breaking strength of the raw material carbon paper, the feeding end conveyor belt and the discharging end conveyor belt are respectively connected with the first vacuum pump and the second vacuum pump to provide vacuum adsorption for the raw material carbon paper conveyed on the feeding end conveyor belt and the discharging end conveyor belt, so that the stable and continuous conveying of the raw material carbon paper in the preparation process of the gas diffusion layer is ensured.
(2) According to the invention, the blanking end conveyor belt is arranged at the output end of the screen printing machine, and the vacuum oven and the high-temperature atmosphere oven are sequentially arranged on the blanking end conveyor belt, so that the continuous process flow of raw material carbon paper coating, vacuum drying, high-temperature drying and final winding is realized, the whole preparation process of the gas diffusion layer of the fuel cell does not need manpower, the production beat of the gas diffusion layer is accelerated, and the commercialization process of continuously preparing the gas diffusion layer in a large scale is facilitated.
(3) The synchronous controller controls the synchronous start and stop of the first motor and the second motor, so that the production beat is accelerated, and the continuous coating in the screen printing machine is realized.
Drawings
FIG. 1 is a schematic view of an apparatus for continuously preparing gas diffusion layers for fuel cells according to the present invention;
fig. 2 is a flow chart of a method for continuously preparing a gas diffusion layer of a fuel cell according to the present invention.
In the figure:
1. a raw material carbon paper support; 2, a feeding end conveying support; 3, a feeding end conveyor belt; a first motor;
5. a first vacuum pump; 6, screen printer; 7, a workbench; a third vacuum pump;
9. a wire mesh plate; 10, a wire mesh support; an automatic feeding tank; 12, insulating ink coating knife;
13. a working position camera; calibrating the camera; a synchronous controller;
16. a blanking end conveyor belt; a blanking end conveying support;
18. a second motor; a second vacuum pump; 20, vacuum drying oven; 21, a high-temperature atmosphere oven;
22. and (7) a winding machine.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
This embodiment firstly provides an apparatus for continuously preparing a gas diffusion layer of a fuel cell, which applies a screen printing method to a raw material carbon paper to coat a microporous layer, and dries and cures the microporous layer to obtain the gas diffusion layer of the fuel cell, as shown in fig. 1, the apparatus for continuously preparing the gas diffusion layer of the fuel cell includes:
the feeding end conveyor belt 3 is driven by a first motor 4 and continuously conveys the raw material carbon paper from the raw material carbon paper support 1; the feeding end conveyor belt 3 is connected with the first vacuum pump 5, and the feeding end conveyor belt 3 adsorbs raw material carbon paper in vacuum in the operation process of the raw material carbon paper, so that the stable operation of the raw material carbon paper is ensured.
And a screen printer 6 arranged at the tail end of the feeding end conveyor belt 3 and used for coating the raw material carbon paper to obtain the microporous layer carbon paper.
The blanking end conveyor belt 16 is arranged at the output end of the screen printing machine 6, the blanking end conveyor belt 16 is sequentially provided with a vacuum oven 20 and a high-temperature atmosphere oven 21, the blanking end conveyor belt 16 is driven by a second motor 18 to continuously convey microporous carbon paper to leave the screen printing machine 6, then the microporous carbon paper is sequentially subjected to vacuum drying by the vacuum oven 20 and high-temperature drying by the high-temperature atmosphere oven 21 to obtain a gas diffusion layer, and finally the gas diffusion layer is wound at the tail end of the blanking end conveyor belt 16. Wherein the feeding end conveyor belt 16 is connected with a second vacuum pump 19, and the raw material carbon paper is vacuum-adsorbed in the running process of the raw material carbon paper.
And a winding machine 22 disposed at the end of the blanking-end conveyor 16 and winding the gas diffusion layer on the blanking-end conveyor 16.
The synchronous controller 15 can control the synchronous start and stop of the first motor 4 and the second motor 18.
Similarly, the raw material carbon paper is gradually released from the raw material carbon paper holder 1 by winding.
It should be explained that the raw material carbon paper is a material with a hydrophobic layer which is subjected to hydrophobic treatment in advance, and the microporous layer is uniformly coated on the surface of the hydrophobic layer and then sintered and cured at high temperature to finally form the gas diffusion layer of the fuel cell.
The device considers the factors of large tensile strength and poor breaking strength of the raw material carbon paper, and the feeding end conveyor belt 3 and the discharging end conveyor belt 16 are respectively connected with the first vacuum pump 5 and the second vacuum pump 19 to provide vacuum adsorption for the raw material carbon paper conveyed by the feeding end conveyor belt and the discharging end conveyor belt, so that the stable and continuous conveying of the raw material carbon paper in the preparation process of the gas diffusion layer is ensured. The blanking end conveyor belt 16 is arranged at the output end of the screen printer 6, the vacuum oven 20 and the high-temperature atmosphere oven 21 are sequentially arranged on the blanking end conveyor belt 16, the continuity of raw material carbon paper coating, vacuum drying, high-temperature drying and final winding is realized, the whole process does not need manpower, the production beat of the preparation of the gas diffusion layer of the fuel cell is accelerated, and the commercialization process of continuously preparing the gas diffusion layer in a large batch is facilitated. The synchronous start and stop of the first motor 4 and the second motor 18 are controlled by the synchronous controller 15, so that the production tact problem in the preparation process of the gas diffusion layer is solved, and the continuous coating in the screen printer 6 is realized.
In order to realize synchronous and stable continuous conveying of the raw material carbon paper, the microporous layer carbon paper and the gas diffusion layer by the feeding end conveyor belt 3 and the blanking end conveyor belt 16, three vacuum pumps, namely a first vacuum pump 5, a second vacuum pump 19 and a third vacuum pump 8 are adopted in combination with the figure 1, the first vacuum pump 5 is connected with the feeding end conveyor belt 3, the second vacuum pump 19 is connected with the blanking end conveyor belt 16, the third vacuum pump 8 is connected with a workbench 7 in a screen printing machine 6, the vacuum degree range of the first vacuum pump 5 and the second vacuum pump 19 is set to be 0.05-0.15MPa when the first vacuum pump 5 and the second vacuum pump 19 are started to operate, the vacuum degree range of the workbench 7 is controlled by the third vacuum pump 19 to be 0.25-0.35MPa when the workbench 7 is vacuumized, the raw material carbon paper and the gas diffusion layer can be stably adsorbed in a vacuum adsorption mode, and the raw material carbon paper, And the fracture occurs out of the original position. The difference between the feeding end conveyor belt 3 and the discharging end conveyor belt 16 is that the material selected for the whole discharging end conveyor belt 16 needs to withstand high temperature baking at 350 ℃, so that the discharging end conveyor belt 16 can drive the microporous layer carbon paper to slowly move in the vacuum oven 20 and the high temperature atmosphere oven 21 for vacuum drying and high temperature drying, and the microporous layer adhesive is cured to obtain the gas diffusion layer. The passing time of the microporous layer carbon paper in the vacuum oven 20 and the high temperature atmosphere oven 21 is limited by two variables of the length of the feeding end conveyor belt 16 and the conveying speed.
Optionally, the vacuum degree in the vacuum oven 20 is 0.07Mpa, the high-temperature atmosphere oven 21 is a continuous nitrogen-filled high-temperature oven, and the drying temperature is 350 ℃.
In order to ensure that the feeding end conveyor belt 3 and the discharging end conveyor belt 16 both run in the same horizontal plane, the feeding end conveyor belt 3 is fixed on the feeding end conveying support 2, and the discharging end conveyor belt 16 is fixed on the discharging end conveying support 17 and is powered by the first motor 4 and the second motor 18 respectively to synchronously drive and run. The feeding end conveyor belt 3 is a first double-layer crawler belt with vacuumizing holes on the surface, and the first double-layer crawler belt is connected with a first vacuum pump 5; the blanking end conveyor 16 is a second dual-track having vacuuming holes formed on the surface thereof, and the second dual-track is connected to a second vacuum pump 19. Preferably, the first double-layer crawler belt and the second double-layer crawler belt are provided with vacuumizing holes at intervals of 5-10 mm.
According to the space requirement, the blanking end conveying belt 16 can be in a two-section type or a three-section type, meanwhile, a corresponding number of blanking end conveying supports 17 are additionally arranged, and power is provided through a second motor 18.
In order to realize the synchronous and stable operation of the feeding end conveyor belt 3 and the discharging end conveyor belt 16, the first motor 4 and the second motor 18 are both connected to the synchronous controller 15, and the first motor 4 and the second motor 18 are synchronously started and stopped according to the instruction of the synchronous controller 15, so that the synchronous forward operation, stop, reverse operation or sudden stop from the feeding end to the discharging end of the raw material carbon paper is realized.
The screen printer 6 in the invention is a key part for realizing the preparation of the gas diffusion layer, and is also a control center, the first motor 4 and the second motor 18 stop working in the printing process of the screen printer 6, after one-time printing is finished, the first motor 4 and the second motor 18 are synchronously started, the part which is printed, namely the microporous layer carbon paper, is moved to the blanking end conveyor belt 16, and the next section of raw material carbon paper is moved to the screen printer 6 for continuing the next printing. Specifically, as shown by a broken line box in fig. 1, the screen printer 6 includes:
the workbench 7 is arranged below the running plane of the raw material carbon paper and has a pneumatic ascending and descending function, and when the raw material carbon paper runs on a production line, the workbench 7 is in a descending state to avoid scraping the raw material carbon paper; when the raw material carbon paper is static, the workbench 7 is lifted to be in contact with the raw material carbon paper and vacuum-adsorbs the raw material carbon paper, and coating and printing are started; when the raw material carbon paper starts to operate again, the table 7 descends after desorption.
And the third vacuum pump 8 is connected with the workbench 7, and the workbench 7 is lifted to be in contact with the raw material carbon paper, and then the workbench 7 is vacuumized to adsorb the raw material carbon paper on the surface of the workbench 7, so that the stability of the raw material carbon paper in the coating process is ensured. The vacuum degree range provided by the third vacuum pump 8 for the workbench 7 is 0.25-0.35MPa, and the raw material carbon paper can be attached to the workbench 7 smoothly.
The screen plate 9 is arranged above the running plane of the raw material carbon paper, and can descend along the screen support 10 and be attached to the raw material carbon paper on the workbench 7 during working;
the automatic feeding tank 11 is arranged above the running plane of the raw material carbon paper, descends to the screen plate 9 along the screen support 10 during working, and provides enough microporous layer slurry for the screen plate 9;
and the insulating ink coating knife 12 is arranged above the running plane of the raw material carbon paper and can descend along the screen support 10 to the screen plate 9 to coat the microporous layer slurry during operation. The insulating ink coating knife 12 moves back and forth on the wire mesh plate 9 until the microporous layer slurry is completely coated;
after one-time coating or printing is finished, the silk screen plate 9, the automatic feeding tank 11 and the insulating ink-coating knife 12 are automatically stopped and lifted to the right position.
The working position camera 13 is arranged on the screen support 10, is positioned at the input end of the screen printer 6 and is used for detecting whether the raw carbon paper runs in place or not, and sending a signal of in place to the synchronous controller 15 after detecting that the raw carbon paper enters the screen printer 6;
the calibration camera 14 is arranged on the screen support 10 and positioned at the output end of the screen printer 6, and is used for judging whether a cross-over line before and after printing on the raw material carbon paper is aligned with the edge of the output end of the workbench 7 or not, and after the cross-over line is aligned, the calibration camera 14 sends a calibration signal to the synchronous controller 15;
after receiving the in-position signal of the working position camera 13 and the calibration signal of the calibration camera 14 at the same time, the synchronous controller 15 synchronously controls the stop of the first motor 4 and the second motor 18, and the screen printer 6 performs coating printing. The coating is performed in a timed setting, and when the coating time is over, the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to be started again to perform the printing or coating of the next station.
The synchronous controller 15 can realize synchronous forward running, reverse running, stopping or sudden stopping of the feeding end conveyor belt 3 and the discharging end conveyor belt 16. The synchronous controller 15 synchronously controls the start and stop of the first motor 4 and the second motor 18, and mainly considers the factors of large tensile strength and poor breaking strength of the carbon paper to ensure the stable operation of the carbon paper as much as possible; the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to stop after simultaneously receiving the in-place signal of the working position camera 13 and the calibration signal of the calibration camera 14, so as to ensure the continuity of coating on the raw material carbon paper and avoid coating failure or repeated coating.
In the screen printer 6, the raising and lowering of the table 7, the screen plate 9, the automatic feed tank 11, and the insulating coating blade 12 are performed by respective driving mechanisms, and the microporous layer coating slurry is raised or lowered by a timed automatic driving manner.
Alternatively, the wire mesh plate 9 may be made of a composite material, a metal material, polytetrafluoroethylene, or the like.
The key of the continuous screen printing preparation of the gas diffusion layer is that the two times of screen printing are reasonably distributed and connected, infrared scanning is carried out through the station camera 13 and the calibration camera 14, the positions of the printing edges of the two times are judged, and repeated printing of the same position of the carbon paper is avoided. In the screen printer 6, after one-time printing is finished, firstly, the screen plate 9, the automatic feeding tank 11 and the insulating ink-coating knife 12 ascend and leave the workbench 7, the workbench 7 is released from vacuum adsorption and descends, and the raw material carbon paper starts to run in the forward direction; when the edge of the output end of the workbench 7 is aligned with the edge of the tail end of the microporous layer carbon paper, the raw material carbon paper stops running, the workbench 7 ascends again and starts vacuum adsorption of the raw material carbon paper, the screen plate 9, the automatic feeding tank 11 and the insulating ink-coating knife 12 descend, and the second printing starts. The above printing process is repeated to realize a continuous automatic process.
Based on the above apparatus for continuously preparing a gas diffusion layer for a fuel cell, the present invention also provides an embodiment of a method for continuously preparing a gas diffusion layer for a fuel cell, which comprises the following steps:
s1, the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to respectively drive the feeding end conveyor belt 3 and the discharging end conveyor belt 16 to run, the feeding end conveyor belt 3 and the discharging end conveyor belt 16 simultaneously start vacuum adsorption, and raw material carbon paper is continuously conveyed;
s2, after the feeding end conveyor belt 3 continuously conveys the raw material carbon paper to the screen printer 6 and reaches the position, the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to stop running, and the raw material carbon paper is coated in the screen printer 6 to obtain microporous layer carbon paper;
s3, after the coating is finished, the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to operate again; the blanking end conveyor belt 16 continuously conveys the microporous carbon paper to leave the screen printing machine 6, and the microporous carbon paper is dried and cured by a vacuum oven 20 and a high-temperature atmosphere oven 21 in sequence to obtain a gas diffusion layer and is wound;
s4, repeating the steps S1-S3, and continuously preparing the fuel cell gas diffusion layer.
In the step S2, the feeding-end conveyor 3 continuously conveys the raw carbon paper into the screen printing machine 6, and whether the raw carbon paper is in place is detected by the following method:
the working position camera 13 detects the raw material carbon paper in place and sends a position signal to the synchronous controller 15, the calibration camera 14 detects the calibration of the cross-over line before and after the raw material carbon paper is coated and sends a calibration signal to the synchronous controller 15, and the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to stop after receiving the position signal and the calibration signal simultaneously.
A timing mechanism is adopted in the coating process, coating is automatically started after the operation of the raw material carbon paper is stopped, the workbench 7 ascends to contact the raw material carbon paper and starts vacuum adsorption, the wire mesh plate 9, the automatic feeding tank 11 and the insulating ink coating knife 12 automatically descend to the right position and start coating until the coating is finished and then ascend to the right position, and then the workbench 7 releases the vacuum adsorption and descends; the synchronous controller 15 synchronously controls the first motor 4 and the second motor 18 to start, the feeding end conveyor 3 and the discharging end conveyor 16 start to synchronously run, and the next printing and coating are executed.
In the timed mechanism design, the screen printer 6 has a timed coating setting on the one hand and the synchronous controller 15 has a timed start setting on the other hand, and the timed time of the synchronous controller 15 is greater than the timed coating time to ensure completion of the timed coating.
In the method, the synchronous controller 15 simultaneously collects the information of the working position camera 13 and the calibration position camera 14, and judges the alignment condition of the cross connecting line before and after printing and the edge of the output end on the workbench 7 in an infrared scanning mode, so that the repeated printing or omission of the raw material carbon paper at the same position is avoided.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An apparatus for continuously preparing a gas diffusion layer for a fuel cell, comprising:
the feeding end conveyor belt (3) is driven by a first motor (4) to continuously convey raw material carbon paper from the raw material carbon paper support (1); the feeding end conveyor belt (3) is connected with a first vacuum pump (5);
the screen printer (6) is arranged at the tail end of the feeding end conveyor belt (3) and is used for coating the raw material carbon paper to obtain microporous layer carbon paper;
the blanking end conveyor belt (16) is arranged at the output end of the screen printing machine (6), a vacuum oven (20) and a high-temperature atmosphere oven (21) are sequentially arranged on the blanking end conveyor belt (16), and the blanking end conveyor belt (16) is driven by a second motor (18) to convey the microporous carbon paper to sequentially pass through the vacuum oven (20) and the high-temperature atmosphere oven (21) so as to obtain a gas diffusion layer; the blanking end conveyor belt (16) is connected with a second vacuum pump (19);
the winding machine (22) is arranged at the tail end of the blanking end conveyor belt (16) and is used for winding the gas diffusion layer;
the synchronous controller (15) controls the first motor (4) and the second motor (18) to be started and stopped synchronously through the synchronous controller (15).
2. The apparatus for continuously manufacturing a gas diffusion layer for a fuel cell according to claim 1, wherein the loading end conveyor (3) is fixed to the loading end conveyor frame (2), and the loading end conveyor (3) is a first double-layer crawler having vacuuming holes formed on the surface thereof, and the first double-layer crawler is connected to the first vacuum pump (5).
3. The apparatus for continuously manufacturing a gas diffusion layer for a fuel cell according to claim 1 or 2, wherein the blanking-end conveyer (16) is supported on a blanking-end conveyer support (17), and the blanking-end conveyer (16) is a second double-layer crawler having vacuuming holes provided on the surface thereof, and the second double-layer crawler is connected to the second vacuum pump (19).
4. The apparatus for continuously manufacturing a gas diffusion layer for a fuel cell according to claim 1, wherein the screen printer (6) comprises:
the workbench (7) is arranged below the running plane of the raw material carbon paper, the workbench (7) is in a descending state when the raw material carbon paper runs on a production line, and the workbench (7) ascends to be in contact with the raw material carbon paper and adsorbs the raw material carbon paper in vacuum when the raw material carbon paper is static on the production line;
the third vacuum pump (8) is connected with the workbench (7), and the workbench (7) is vacuumized after the workbench (7) rises so as to adsorb the raw material carbon paper on the surface of the workbench (7);
the screen plate (9) is arranged above the running plane of the raw material carbon paper, can descend along the screen support (10) and is attached to the raw material carbon paper on the workbench (7);
an automatic feeding tank (11) arranged above the running plane of the raw material carbon paper and capable of descending along the screen support (10) to the screen plate (9) to provide microporous layer slurry;
an insulating inking knife (12) arranged above the running plane of the raw carbon paper and capable of descending along the screen support (10) to the screen plate (9) to coat the microporous layer slurry;
the working position camera (13) is arranged on the screen support (10) and is positioned at the input end of the screen printing machine (6), and is used for detecting whether the raw material carbon paper is positioned or not and sending a positioning signal to the synchronous controller (15);
the calibration camera (14) is arranged on the screen support (10) and is positioned at the output end of the screen printing machine (6), and when the cross-connecting lines before and after coating on the raw carbon paper are aligned with the edge of the workbench (7) at the output end, the calibration camera (14) sends a calibration signal to the synchronous controller (15);
and after receiving the in-place signal and the calibration signal at the same time, the synchronous controller (15) synchronously controls the first motor (4) and the second motor (18) to stop.
5. The apparatus for continuously manufacturing a gas diffusion layer for a fuel cell according to claim 1, wherein the degree of vacuum of the vacuum oven (20) is 0.1 Mpa.
6. The apparatus for continuously manufacturing a gas diffusion layer for a fuel cell according to claim 1, wherein the high temperature atmosphere oven (21) is a nitrogen filled high temperature oven at a temperature of 350 ℃.
7. The apparatus for continuously manufacturing a gas diffusion layer for a fuel cell according to claim 4, wherein the first vacuum pump (5) and the second vacuum pump (19) control the degree of vacuum of the feeding-end conveyer belt and the discharging-end conveyer belt (16) to be 0.05-0.15Mpa, respectively, and the third vacuum pump (8) controls the degree of vacuum of the work table (7) to be 0.25-0.35 Mpa.
8. A method of continuously preparing a gas diffusion layer for a fuel cell, using the apparatus of any one of claims 1 to 7, comprising the steps of:
s1, the synchronous controller (15) synchronously controls the first motor (4) and the second motor (18) to respectively drive the feeding end conveyor belt (3) and the discharging end conveyor belt (16) to operate, the feeding end conveyor belt (3) and the discharging end conveyor belt (16) simultaneously start vacuum adsorption, and raw material carbon paper is continuously conveyed;
s2, after the raw material carbon paper is continuously conveyed by the feeding end conveyor belt (3) to enter the screen printing machine (6) and reach the position, the synchronous controller (15) synchronously controls the first motor (4) and the second motor (18) to stop running; the raw carbon paper is coated in the screen printing machine (6) to obtain the microporous layer carbon paper;
s3, after the coating is finished, the synchronous controller (15) synchronously controls the first motor (4) and the second motor (18) to operate again; the blanking end conveyor belt (16) continuously conveys the microporous layer carbon paper to leave the screen printer (6), and the microporous layer carbon paper is dried and cured by the vacuum oven (20) and the high-temperature atmosphere oven (21) in sequence to obtain a gas diffusion layer and is wound;
s4, repeating the steps S1-S3, and continuously preparing the gas diffusion layer.
9. The method of continuously manufacturing a gas diffusion layer for a fuel cell according to claim 8, wherein the presence of the gas diffusion layer in step S2 is detected by:
workstation camera (13) are right raw materials carbon paper targets in place and detects and sends target in place signal gives synchronous controller (15), and calibration camera (14) are right handing-over line around coating on the raw materials carbon paper calibrates and detects and send calibration signal gives synchronous controller (15), synchronous controller (15) receive simultaneously target in place signal with synchronous control behind the calibration signal first motor (4) with second motor (18) stop.
10. The method of continuously producing a gas diffusion layer for a fuel cell according to claim 8 or 9, wherein the coating is performed periodically.
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