CN109786765B - Forming method of surface microstructure of metal cathode plate of fuel cell - Google Patents
Forming method of surface microstructure of metal cathode plate of fuel cell Download PDFInfo
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- CN109786765B CN109786765B CN201811586229.2A CN201811586229A CN109786765B CN 109786765 B CN109786765 B CN 109786765B CN 201811586229 A CN201811586229 A CN 201811586229A CN 109786765 B CN109786765 B CN 109786765B
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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 method for forming a surface microstructure of a metal cathode plate of a fuel cell, which comprises the steps of firstly adopting a piezoelectric brake loading material micro-deformation method to carry out precision design on rollers of mechanical and electrical system, and then completing the research and development work of 200 mu m-grade micro-groove equipment to obtain a mechanical structure and a servo control system which accord with the electromechanical precision; the invention provides a method for solving the problem of processing the pores of a double-layer cathode plate, provides a processing method of a roller head capable of pressing the pores of 200 mu m, finally combines a mechanical micro-rolling processing method with real-time piezoelectric braking, and rolls and forms the surface pore microstructure of 200 mu m in one step, thereby having high production efficiency, accurate size control and easy mass preparation of metal surface textures.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a method for forming a pore microstructure on the surface of a metal cathode plate of a fuel cell.
Background
At present, metal cathode plates of fuel cells all adopt a single-layer structure, the pressure difference between an inlet and an outlet of a flow field of the cathode plate is too low, most of gas flows out from the outlet, so that the efficiency of reaction gas permeating into a reaction membrane is low, the power density is reduced, and the processing of bulges in the flow field is not ideal.
The japan toyota company proposes a double-layer 3D "tile-like" flow field structure as shown in fig. 1, in which fluid flows through an interlayer cavity, wherein the direction of the arrow is the reaction gas flow direction, and a part of the flow direction is the pore space, i.e. into the reaction membrane. And forming a three-dimensional flow field with inverted scaly holes by die pressing after the bottom layer (close to the reaction film layer) is provided with pores, and enabling reaction gas to enter the film through the inverted scaly holes. Compared with the traditional two-dimensional structure manufactured by stamping, the three-dimensional structure can greatly enhance the efficiency of the reaction gas permeating into the membrane, increases the power density, has important significance for the design of a gas flow field, especially a cathode flow field, and is a future flow field plate design direction.
However, the forming with the three-dimensional flow field has high requirements on the processing of the surface pores of the metal cathode plate, and the current rolling processing or stamping processing method cannot meet the requirements on forming precision.
Disclosure of Invention
The invention aims to provide a novel method for forming a pore microstructure on the surface of a metal cathode plate of a fuel cell, which has the advantages of small system volume, no pollution, low cost, accurate size control and easy mass preparation of metal surface textures.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for forming a surface microstructure of a metal cathode plate of a fuel cell comprises the following steps:
step 1, determining the specification of a prefabricated gear roller for processing according to the shape and size of a pore of a three-dimensional flow field on the surface of a target metal cathode plate;
step 2, designing a specific structure of the prefabricated tooth roller;
and 3, processing a 200-micron-level prefabricated tooth roller according to a micro rolling forming principle: the method comprises the following steps of selecting the forming main direction of a roller by indexing by adopting an NSK 200-micron high-speed milling cutter through a variable-direction grooving technology, directly milling on the surface of stainless steel, decomposing a complex-shaped groove into a plurality of simple shapes, and sequentially forming to obtain a prefabricated tooth roller;
step 4, detecting the machined prefabricated gear roller, and if the machined prefabricated gear roller is unqualified, performing index milling again according to the design structure in the step 2 until the machined prefabricated gear roller is qualified;
step 5, performing strengthening treatment on the 200-micron-grade prefabricated gear roller by adopting an ion beam implantation method to ensure that the surface stress of the prefabricated gear roller reaches 5-10 GPa;
step 6, determining the electromechanical precision of a processing mechanical structure and a servo control system according to the three-dimensional flow field of the surface of the target metal cathode plate and the parameters of the prefabricated tooth roller;
step 7, designing a micro rolling mechanical system with a feedback regulator, which meets the requirements of the depth (50-100 μm) and the gap of the processing indentation;
and 8, rolling the surface of the metal cathode plate at one time in a manner of vertically meshing the prefabricated gear roller until a 200-micron-level surface pore microstructure is prepared, thereby obtaining the fuel cell cathode plate with the three-dimensional flow field surface microstructure. The three-dimensional flow field plates with other structures are manufactured by changing the arrangement, feeding and shape of the prefabricated teeth on the prefabricated tooth roller.
Furthermore, in the step 8, the material deflection deformation piezoelectric braking control and sensing technology is adopted to monitor the pressure-roller gap in real time in the rolling process, and the pressure distribution in the whole rolling process is controlled to be uniform.
The invention has the following positive beneficial effects: according to the scheme, a micro rolling method is firstly provided, then a micro rolling mechanical system with a prefabricated gear roller and a feedback regulator is designed, a 200-micron-level surface pore microstructure is prepared on the surface of a metal plate through one-step rolling of the roller which is vertically meshed, and the problem of forming of a 200-micron-level precision three-dimensional structure of a 0.1mm metal thin plate is successfully solved. The system has the advantages of small volume, no pollution, low cost, accurate size control and easy mass preparation of the metal surface texture.
Drawings
FIG. 1 is a partial schematic view of a surface microstructure of a conventional metal cathode plate;
fig. 2 is a processing flow of the three-dimensional flow field structure on the surface of the metal cathode plate.
Fig. 3 is a schematic structural view of a pre-tooth roller for molding.
Detailed Description
The invention is described in detail below with reference to the following figures and examples, which are as follows:
referring to fig. 2, the method for forming the three-dimensional flow field pore microstructure shown in fig. 1 on the surface of the metal cathode plate of the fuel cell comprises the following steps:
step 1, determining the specification of the prefabricated tooth roller for processing according to the shape and the size of the pore of the three-dimensional flow field on the surface of the target metal cathode plate.
And 2, designing a specific structure of the prefabricated tooth roller.
And 3, processing a 200-micron-level prefabricated tooth roller according to a micro rolling forming principle: the method comprises the steps of selecting the forming main direction of a roller by indexing by using an NSK 200-micron high-speed milling cutter through a variable-direction grooving technology, directly milling on the surface of stainless steel, decomposing a groove with a complex shape into a plurality of simple shapes, and sequentially forming to obtain the prefabricated tooth roller, wherein the prefabricated tooth roller is shown in figure 3.
And 4, detecting the machined prefabricated tooth roller, and if the machined prefabricated tooth roller is unqualified, performing index milling again according to the design structure in the step 2 until the prefabricated tooth roller is qualified in detection.
And 5, performing strengthening treatment on the 200-micron-grade prefabricated gear roller by adopting an ion beam implantation method to ensure that the surface stress of the prefabricated gear roller reaches 5-10 GPa.
And 6, determining the electromechanical precision of the processing mechanical structure and the servo control system according to the three-dimensional flow field of the surface of the target metal cathode plate and the parameters of the prefabricated tooth roller.
And 7, designing a micro rolling mechanical system with a feedback regulator, which meets the requirements of the depth (50-100 mu m) and the gap of the processing indentation.
And 8, rolling the surface of the metal cathode plate at one time in a manner of vertically meshing a prefabricated gear roller, monitoring the pressure-roller gap in real time in the rolling process by adopting a material deflection deformation piezoelectric braking control and sensing technology, and controlling the pressure distribution in the whole rolling process to be uniform until a surface pore microstructure of 200 mu m level is prepared, thereby obtaining the fuel cell cathode plate with the three-dimensional flow field surface microstructure.
The three-dimensional flow field plates with other structures are manufactured by changing the arrangement, feeding and shape of the prefabricated teeth on the prefabricated tooth roller.
The method can roll to obtain 200 mu m-level pores, has high rolling precision, and obtains the three-dimensional flow field structure shown in figure 1 after compression molding. The system has the advantages of small volume, no pollution, low cost and accurate size control, and the method for processing the Toyota-like double-layer flow field structure is easy to prepare metal surface textures in a large scale and does not have a similar processing method in the market.
The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.
Claims (2)
1. A forming method of a surface microstructure of a metal cathode plate of a fuel cell is characterized in that: comprises the following steps
Step 1, determining the specification of a prefabricated gear roller for processing according to the shape and size of a pore of a three-dimensional flow field on the surface of a target metal cathode plate;
step 2, designing a specific structure of the prefabricated tooth roller;
step 3, selecting the forming main direction of the roller by indexing by adopting a 200-micron high-speed milling cutter through a variable-direction grooving technology, directly milling on the surface of the stainless steel, decomposing the complex-shaped grooves into a plurality of simple shapes, and sequentially forming to obtain a 200-micron-grade prefabricated tooth roller;
step 4, detecting the machined prefabricated gear roller, and if the machined prefabricated gear roller is unqualified, performing index milling again according to the design structure in the step 2 until the machined prefabricated gear roller is qualified;
step 5, performing strengthening treatment on the 200-micron-grade prefabricated gear roller by adopting an ion beam implantation method to ensure that the surface stress of the prefabricated gear roller reaches 5-10 GPa;
step 6, determining the electromechanical precision of a processing mechanical structure and a servo control system according to the three-dimensional flow field of the surface of the target metal cathode plate and the parameters of the prefabricated tooth roller;
step 7, designing a micro rolling mechanical system with a feedback regulator, which meets the requirements of the depth and the gap of the machined indentation;
and 8, rolling the surface of the metal cathode plate at one time in a manner of vertically meshing the prefabricated gear roller until a 200-micron-level surface pore microstructure is prepared, thereby obtaining the fuel cell cathode plate with the three-dimensional flow field surface microstructure.
2. The method as claimed in claim 1, wherein in step 8, the pressure and the roller gap during the rolling process are monitored in real time by using material deflection deformation piezoelectric braking control and sensing technology, and the pressure distribution during the whole rolling process is controlled to be uniform.
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| CN201811586229.2A CN109786765B (en) | 2018-12-25 | 2018-12-25 | Forming method of surface microstructure of metal cathode plate of fuel cell |
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| CN201811586229.2A CN109786765B (en) | 2018-12-25 | 2018-12-25 | Forming method of surface microstructure of metal cathode plate of fuel cell |
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| CN109786765B true CN109786765B (en) | 2021-08-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102782918A (en) * | 2011-02-21 | 2012-11-14 | 丰田自动车株式会社 | Fuel cell |
| CN104253280A (en) * | 2014-09-04 | 2014-12-31 | 华中科技大学 | Solid-oxide-fuel-cell cathode gas flow field plate and preparation method thereof |
| CN108155396A (en) * | 2017-12-29 | 2018-06-12 | 上海神力科技有限公司 | A kind of fuel cell moulded cathode veneer and the pairs of production method of anode veneer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014032822A (en) * | 2012-08-02 | 2014-02-20 | Toyota Auto Body Co Ltd | Porous flow path plate, fuel cell, manufacturing method of porous flow path plate, and manufacturing method of fuel cell |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102782918A (en) * | 2011-02-21 | 2012-11-14 | 丰田自动车株式会社 | Fuel cell |
| CN104253280A (en) * | 2014-09-04 | 2014-12-31 | 华中科技大学 | Solid-oxide-fuel-cell cathode gas flow field plate and preparation method thereof |
| CN108155396A (en) * | 2017-12-29 | 2018-06-12 | 上海神力科技有限公司 | A kind of fuel cell moulded cathode veneer and the pairs of production method of anode veneer |
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