CN115621486B - Gas diffusion layer with variable gradient staggered guide flow channels and preparation method thereof - Google Patents
Gas diffusion layer with variable gradient staggered guide flow channels and preparation method thereof Download PDFInfo
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
- B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04225—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during start-up
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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
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04253—Means for solving freezing problems
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04291—Arrangements for managing water in solid electrolyte fuel cell systems
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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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Abstract
The invention discloses a gas diffusion layer with variable gradient staggered guide flow channels and a preparation method thereof, wherein the surface of the gas diffusion layer, which is close to one side of a bipolar plate, is provided with a longitudinal flow channel and a transverse flow channel, the part outside the flow channel is called a back, the transverse flow channel 3 is parallel to the gas flow direction and the number of the transverse flow channels is continuously increased along the gas flow direction, the longitudinal flow channel is perpendicular to the gas flow direction, the depth of the longitudinal flow channel is gradually increased along the gas flow direction, the longitudinal flow channel and the transverse flow channel are staggered and mutually communicated, and the transverse flow channel has a certain gradient along the length direction.
Description
Technical Field
The invention belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a gas diffusion layer with variable gradient staggered guide flow channels and a preparation method thereof.
Background
A proton exchange membrane fuel cell is a power generation device that converts chemical energy into electrical energy by electrochemical reactions using hydrogen as a fuel and a Proton Exchange Membrane (PEM) as an electrolyte. Compared with other types of fuel cells, the proton exchange membrane fuel cell has the advantages of compact structure, high efficiency, high reliability, long service life and the like. However, since the cathode is open to air, water rapidly evaporates under the influence of low vapor pressure, heat and air convection during low-pressure operation, which causes an increase in proton exchange membrane resistance, thereby affecting cell efficiency.
The stability of operation of proton exchange membrane fuel cell systems is largely dependent on their ability to manage water. When the fuel cell is in operation, oxygen and hydrogen ions at the interface of the cathode catalytic layer and the gas diffusion layer undergo a reduction reaction to generate a large amount of liquid water, and the liquid water needs to permeate towards the bipolar plate through the Gas Diffusion Layer (GDL) is an important component of the membrane electrode of the core component of the fuel cell, acts as a carrier for water vapor transport, heat transfer and electronic conduction in the fuel cell system and provides structural support for other components during assembly and operation), so as to be discharged out of the system. If the generated liquid water is discharged when not, the liquid water can be accumulated on the catalytic layer to prevent the further progress of the reaction, so that the phenomenon of flooding is caused, the performance of the battery is greatly influenced, the performance of the gas diffusion layer directly influences the progress of the electrochemical reaction and the working efficiency of the battery, and the deep research on the air permeability and the water drainage of the gas diffusion layer of the fuel battery is particularly important.
In the prior art, aiming at the water vapor management of the gas diffusion layer of the fuel cell, two aspects are mainly considered, namely, the gas diffusion layer is combined with other special materials to form a composite GDL, and the material property is changed, so that the air permeability and the water drainage property of the gas diffusion layer are enhanced, but secondary processing is required, and the flow is complicated; and secondly, the hydrophobicity of the surface of the gas diffusion layer is increased by adding the hydrophobic agent PTFE on the gas diffusion layer, so that the discharge of liquid water is accelerated.
At present, in the subzero environment of the fuel cell, water generated by the reaction is frozen due to low temperature and cannot be timely discharged from a cathode, so that the performance of the fuel cell is reduced and the fuel cell cannot be started. The existing cold start strategy mainly comprises shutdown purging, external preheating and internal heating, and the shutdown purging has the defects that the water concentration difference between the membrane electrode and the flow field is small, and water in the membrane electrode is difficult to be taken away from the flow channel of the flow field in a short time; the temperature is raised by the water being discharged in a liquid state.
Disclosure of Invention
Aiming at the problems that the ice content is excessive and the reaction liquid water cannot be discharged in time during cold start in the prior art, the invention provides the gas diffusion layer with the variable gradient staggered guide flow channels and the preparation method thereof, so that the transmission rate of reaction gas to the microporous layer is improved, the gas distribution capacity of the gas diffusion layer is enhanced, the guide flow channel structure is designed to increase the pressure between the catalytic layer and the gas diffusion layer, the water discharge capacity is enhanced, and the phenomenon of flooding caused by excessive water blocking pores is avoided.
The invention is realized by adopting the following technical scheme: a gas diffusion layer with variable gradient staggered guide flow channels, wherein a longitudinal flow channel and a transverse flow channel are arranged on the surface of the gas diffusion layer close to one side of the bipolar plate, and the part between the adjacent transverse flow channels is called a ridge back part;
the transverse flow channels are parallel to the gas flow direction, the number of the transverse flow channels is gradually increased along the gas flow direction, the longitudinal flow channels are perpendicular to the gas flow direction, the depth of the transverse flow channels is gradually increased along the gas flow direction, and the longitudinal flow channels and the transverse flow channels are staggered and mutually communicated.
Further, the transverse flow channels are obliquely arranged along the gas flowing direction, have the same gradient and depth, and adapt to different drainage intensities when the liquid water content is different due to the increase of the number of the transverse flow channels and the deepening of the depth of the longitudinal flow channels.
Further, a micro-rounded corner structure is provided along the circumferential edge of the ridge back to enhance the resilience of the gas diffusion layer and to enhance the degree of matching between the gas diffusion layer and the seal line in compression and compression forces.
Further, the depth of the longitudinal flow channel is gradually increased in an equal gradient.
Further, the gradient of the transverse flow channel is between 5 and 30 degrees.
Further, the length of the back of the ridge is constant, and the width thereof is continuously reduced along with the flowing direction of the gas.
Further, the length of the back of the middle part of the ridge on the gas diffusion layer is smaller than that of the back of the left and right end parts of the ridge on the gas diffusion layer, and the width of the back is continuously reduced along with the flowing direction of the gas.
Further, the transverse flow channels, the longitudinal flow channels and the micro-rounded structures are collectively called as microstructures, and the area of the microstructures accounts for 25-50% of the total area of the gas diffusion layer.
The invention further provides a preparation method of the gas diffusion layer based on the staggered guiding flow channel with the variable gradient, which comprises the following steps:
(1) Performing femtosecond laser micro-nano technology processing on the surface of the gas diffusion layer close to one side of the bipolar plate;
the laser parameters for processing the longitudinal flow channel and the transverse flow channel structures are as follows: the laser wavelength is 500nm-1000nm, the power is 0.1W-25W, the repetition frequency is 0-200kHz, and the pulse width is 0-130ns; the laser parameters for processing the micro-fillet structure are as follows: the laser wavelength is 500nm-1000nm, the power is 0.1W-5W, the repetition frequency is 0-500kHz, and the pulse width is 0-20ps;
(2) And (3) deburring: and sequentially carrying out deburring treatment on the gas diffusion layer subjected to the femtosecond laser micromachining by utilizing ultrasonic cleaning, glow cleaning and sputtering cleaning.
Furthermore, the gas diffusion layer is made of carbon paper, and has the advantages of light weight, smooth surface, corrosion resistance, uniform pores and high strength.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) When the liquid water content is different, the variable gradient staggered structure correspondingly generates different drainage intensities, the consistency of water distribution in the gas flow direction is enhanced, the design of the guide runner increases the pressure between the catalytic layer and the gas diffusion layer, capillary force is generated, the liquid water is guided to be discharged, the drainage capacity is enhanced, and the phenomenon of flooding caused by excessive water blocking pores is avoided;
in addition, the water content at the gas inlet is obviously reduced through the gradient staggered structure, so that the content of water ice is reduced, the temperature rising and ice melting speed is higher when the fuel cell is started, and the cold starting capability of the fuel cell is improved;
(2) By arranging the transverse flow channels and the longitudinal flow channels, the contact area between the reaction gas and the flow channels is increased, the transmission rate of the reaction gas to the microporous layer and the wetting effect of the reaction gas are improved, the gas distribution capacity of the gas diffusion layer is enhanced, the gas reaction stability is enhanced, and the battery performance is improved;
(3) The micro-fillet (circular arc) structure is arranged at the back part, so that the rebound performance of the gas diffusion layer is enhanced, the matching degree between the compression amount and the compression force of the gas diffusion layer and the sealing line is improved, and the stability of the membrane electrode structure is improved.
(4) The staggered guide runner structure of the gas diffusion layer adopts a femtosecond laser processing method, so that the processing process is simplified, the processing level is improved, the service life of the gas diffusion layer is prolonged, and the working state is more stable.
Drawings
FIG. 1 is a schematic view of an overall structure of a gas diffusion layer according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a gas diffusion layer according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of an embodiment A of the present invention;
FIG. 4 is a schematic view of the structure of the embodiment B of the present invention;
FIG. 5 is a schematic view of the transverse flow channels, longitudinal flow channels and back structure of an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of an embodiment C-C of the present invention;
FIG. 7 is a graph showing the comparison of water volume fractions at different voltages for a conventional solution and a modified solution according to an embodiment of the present invention;
Detailed Description
In order that the above objects, features and advantages of the invention will be more readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and in this embodiment, the longitudinal, lateral, etc. positions are set forth in the direction of fig. 2, the lateral, and the vertical are set forth, however, the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.
Embodiment 1, this embodiment discloses a gas diffusion layer with a gradient-changing staggered guide runner, as shown in fig. 1-2 (in fig. 2, oblique line filling and point filling parts have no special meaning and are only used for conveniently distinguishing transverse runners and longitudinal runners), the gas diffusion layer in this embodiment is a cathode gas diffusion layer, the left side is an inlet section, the right side is an outlet section, a ridge back 1, a longitudinal runner 2 and a transverse runner 3 are arranged on the surface of the gas diffusion layer, which is close to one side of the bipolar plate, the transverse runner 3 is parallel to the gas flow direction and the number of the transverse runner is continuously increased along the gas flow direction, the longitudinal runner 2 is perpendicular to the gas flow direction and the depth of the longitudinal runner is gradually increased along the gas flow direction in a ladder shape, and the longitudinal runner 2 and the transverse runner 3 are staggered and are mutually communicated.
Through the design of the transverse flow channels 3 and the longitudinal flow channels 2, the transmission rate of the reaction gas to the microporous layer is improved, and the gas distribution capacity of the gas diffusion layer is enhanced. In order to correspond to different drainage intensities when the liquid water content is different, the transverse flow channels 3 are obliquely arranged along the gas flow direction, which is called a guiding slope, the transverse flow channels 3 are arranged to have the same slope and depth, the depth of the longitudinal flow channels 2 is gradually increased along the gas flow direction, so that the pressure between the catalytic layer and the gas diffusion layer can be effectively increased, capillary action force is generated, the liquid water is guided to be discharged, the drainage capacity is enhanced, and the phenomenon of flooding caused by too much water blocking pores is avoided.
In addition, in order to enhance the rebound resilience of the gas diffusion layer and to improve the matching degree between the compression amount and the compression force of the gas diffusion layer and the seal line, as shown in fig. 3, a micro-rounded structure 4 is provided along the circumferential edge of the back portion 1, and the micro-rounded (circular-arc) structure provided by the present invention is provided by providing a rounded (circular-arc) microstructure around the bonded portion of the gas diffusion layer and the bipolar plate. In the assembly process of the gas diffusion layer, indexes such as strain, porosity, conductivity, gas diffusion characteristics and the like of the diffusion layer are changed along with the increase of the pressing force, and the characteristics of the diffusion layer under the ridge and the groove of the bipolar plate are greatly different, so that the hydrothermal management of the fuel cell during operation is influenced. Therefore, the micro-fillet (circular arc) structure is arranged, the rebound resilience performance of the gas diffusion layer is improved, the matching degree between the compression amount and the compression force of the gas diffusion layer and the sealing line is improved, and the stability of the membrane electrode structure is improved.
As shown in fig. 2 and 6, the depth of the longitudinal flow channels 2 is gradually increased from left to right, the number of the transverse flow channels 3 is gradually increased, the transverse flow channels 3 have slopes, the drainage effect is achieved, and the surfaces of the whole gas diffusion layers are distributed in a multi-flow channel staggered mode. In this embodiment, the thickness of the gas diffusion layer is between 200 μm and 500 μm, the thickness of the gas diffusion layer is preferably 300 μm, the width a of the lateral flow channel 3 is between 30 μm and 60 μm, preferably 35 μm, the minimum depth h is between 30 μm and 60 μm, preferably 40 μm, the gradient θ is between 5 ° and 30 ° preferably 15 °, the maximum depth h1 is between 40 μm and 70 μm, preferably 60 μm, the longitudinal flow channel width b is between 30 μm and 60 μm, the depth increases in gradient with the gas flow direction, the depth of the first longitudinal flow channel (from left to right) is between 30 μm and 60 μm, the depth increases with a tolerance of 5 μm to 15 μm, for example, if the depth of the first longitudinal flow channel increases with a tolerance of 5 μm, the depth of the second longitudinal flow channel is 40 μm, the depth of the third longitudinal flow channel is 45 μm, the depth of the fourth longitudinal flow channel is 50 μm … …, and so on. The length d of the back of the ridge is between 20mm and 40mm, preferably 30 μm, and the width c is continuously reduced along with the flowing direction of the gas, and the tolerance is between 3mm and 18mm (considering that the change of the length of the back of the ridge does not improve the gas transportation efficiency and the liquid water discharge, if the length is too small, the effect of the flow guiding of the transverse flow channels is reduced, if the length is too large, the number of the longitudinal flow channels is reduced, and no obvious depth change exists, the length of the back of the ridge is preferably unchanged, that is, the length of the transverse flow channel 3 can be kept unchanged, and of course, the length of the transverse flow channel 3 can also be designed into other forms such as long middle and short at the left end and the right end.
On the gas diffusion layer, the transverse flow channel, the longitudinal flow channel and the micro-fillet structure are etched by using a femtosecond laser, and are collectively called as microstructures, wherein the microstructures account for 25% to 50% of the total area of the gas diffusion layer, and the preferred embodiment is 30%.
In summary, the variable gradient longitudinal flow channel provided by the invention deepens the depth of the longitudinal flow channel in a gradient manner along the flowing direction of the reaction gas, the arrangement of the number of the transverse flow channels increases the utilization rate of the surface area of the gas diffusion layer, increases the contact area between the reaction gas and the surface of the gas diffusion layer, improves the transmission rate of the reaction gas to the microporous layer, and enhances the capability of the gas diffusion layer for distributing the reaction gas, thereby improving the performance of the fuel cell. In addition, the increase of the specific surface area of the gas diffusion layer is beneficial to the wetting effect of the reaction gas, and the stability of the reaction is improved.
Moreover, on the basis of the variable gradient longitudinal flow channels, the transverse flow channels and the longitudinal flow channels are arranged in a staggered structure, so that when the liquid water content is different, different drainage intensities can be correspondingly generated, the gas diffusion layer has self-adaptive capability, and the consistency of water distribution along the gas flow direction is ensured. The transverse flow passage provided by the invention is provided with the slope with the flow guiding effect for guiding, and the arrangement of the variable gradient longitudinal flow passage and the transverse flow passage guiding slope increases the pressure between the catalytic layer and the gas diffusion layer, generates capillary action force, guides liquid water to be discharged, enhances the water discharging capability and avoids the phenomenon of flooding caused by blocking pores by excessive water.
The arrangement of the gradient-changing staggered structure gradually increases the depth of the longitudinal flow channel along the flowing direction of the reaction gas, the specific surface area of the whole gas diffusion layer is continuously increased from left to right, the water content at the inlet of the reaction gas is reduced, the content of water into ice is reduced along with the reduction of the content of water, and then when the fuel cell is started, the temperature rising and ice melting speed is higher, the preparation time of the fuel cell reaching an ideal working state is shortened, and the cold starting capability of the fuel cell is improved.
Embodiment 2, this embodiment proposes a method for preparing a gas diffusion layer with variable gradient staggered guide channels according to embodiment 1;
the gas diffusion layer material of the invention adopts carbon paper, has light weight, smooth surface, corrosion resistance, uniform pore and high strength, and the specific processing method is as follows:
(1) And processing the gas diffusion layer near one side surface of the bipolar plate by a femtosecond laser micro-nano technology, wherein the laser parameters for processing the longitudinal flow channel and the transverse flow channel structure are as follows: the laser wavelength is 500nm-1000nm, the power is 0.1W-25W, the repetition frequency is 0-200kHz, and the pulse width is 0-130ns; the laser parameters for processing the micro-fillet structure are as follows: the laser wavelength is 500nm-1000nm, the power is 0.1W-5W, the repetition frequency is 0-500kHz, and the pulse width is 0-20ps;
(2) And then deburring is carried out on the gas diffusion layer after the femtosecond laser micro-processing in sequence by utilizing ultrasonic cleaning, glow cleaning and sputtering cleaning.
Fig. 7 is a comparison of water content of the gas diffusion layer of the present invention with that of the conventional gas diffusion layer under different voltages, wherein the horizontal axis of fig. 7 is voltage, and the vertical axis is average water volume fraction.
The present invention is not limited to the above embodiments, and any equivalent embodiments which can be changed or modified by the technical disclosure can be applied to other fields by those skilled in the art without departing from the technical disclosure, but any simple modification, equivalent variation and modification of the above embodiments according to the technical matter of the present invention still fall within the scope of the technical disclosure.
Claims (6)
1. A gas diffusion layer with variable gradient staggered guide flow channels, wherein a longitudinal flow channel (2) and a transverse flow channel (3) are arranged on one side surface of the gas diffusion layer close to a bipolar plate, and a part between adjacent transverse flow channels (3) is called a back part (1), and the gas diffusion layer is characterized in that:
the transverse flow channels (3) are parallel to the gas flow direction, the number of the transverse flow channels is gradually increased along the gas flow direction, the longitudinal flow channels (2) are perpendicular to the gas flow direction, the depth of the longitudinal flow channels is gradually increased along the gas flow direction, and the longitudinal flow channels (2) and the transverse flow channels (3) are staggered and mutually communicated;
the transverse flow channels (3) are obliquely arranged along the gas flow direction, and the transverse flow channels (3) have the same gradient and depth;
the length of the back part (1) is unchanged, the width of the back part is continuously reduced along with the flowing direction of the gas, a micro-fillet structure (4) is arranged along the circumferential edge of the back part (1), the transverse flow channel (3), the longitudinal flow channel (2) and the micro-fillet structure (4) are collectively called as a micro-structure, and the micro-structure area accounts for 25-50% of the total area of the gas diffusion layer.
2. The gas diffusion layer with variable gradient staggered pilot channels of claim 1, wherein: the depth of the longitudinal flow channel (2) is gradually increased in an equal gradient way.
3. The gas diffusion layer with variable gradient staggered pilot channels of claim 1, wherein: the gradient of the transverse flow channel (3) is between 5 and 30 degrees.
4. The gas diffusion layer with variable gradient staggered pilot channels of claim 1, wherein: the length of the middle part of the back part (1) of the ridge on the gas diffusion layer is smaller than that of the back parts (1) of the left and right end parts of the back part on the gas diffusion layer, and the width of the back part (1) is continuously reduced along with the flowing direction of the gas.
5. A method for producing a gas diffusion layer with variable gradient staggered pilot channels according to any one of claims 2 to 4, characterized in that: the method comprises the following steps:
(1) Performing femtosecond laser micro-nano technology processing on the surface of the gas diffusion layer, which is close to one side of the bipolar plate, and processing a longitudinal runner, a transverse runner and a micro-fillet structure;
(2) And (3) deburring: and sequentially carrying out deburring treatment on the gas diffusion layer subjected to the femtosecond laser micromachining by utilizing ultrasonic cleaning, glow cleaning and sputtering cleaning.
6. The method for preparing a gas diffusion layer with variable gradient staggered guide channels according to claim 5, wherein: and the gas diffusion layer is made of carbon paper.
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| CN116397249B (en) * | 2023-06-08 | 2023-08-15 | 上海治臻新能源股份有限公司 | Diffusion layer, electrolytic cell and processing method |
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