CN112366333B - 3D printing processing method of conductive partition plate with gas-liquid distribution flow field - Google Patents
3D printing processing method of conductive partition plate with gas-liquid distribution flow field Download PDFInfo
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- CN112366333B CN112366333B CN202010993321.1A CN202010993321A CN112366333B CN 112366333 B CN112366333 B CN 112366333B CN 202010993321 A CN202010993321 A CN 202010993321A CN 112366333 B CN112366333 B CN 112366333B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
-
- 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
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
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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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
-
- 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
Abstract
The invention relates to a processing method of a conductive partition plate with a gas-liquid distribution flow field structure, which integrates functional partitions such as a sealing rubber line groove, a diversion groove, a gas channel, a liquid channel and the like on the same component by a 3D printing method and is integrally formed. Compared with the conductive partition plate processed by the traditional process, the technical scheme has the advantages that the processing times are reduced, the processing difficulty is reduced, and the manufacturing of the conductive partition plate, the assembly quality of the galvanic pile and the positioning precision are ensured; the conductive partition plate processed by the invention does not need to independently reinforce the sealant slot, and can ensure the operation stability of the electrolytic cell under the working condition of producing high-pressure hydrogen (3.5 MPa); the conductive partition plate processed by the invention has the advantages of simple structure, convenient and reliable installation, reduction of processing procedure links and improvement of structural reliability. The separator plate optimized by the method has better performance when being used in a Proton Exchange Membrane (PEM) water electrolytic cell.
Description
Technical Field
The invention belongs to the field of electrochemistry, and particularly relates to a preparation method of a conductive partition plate with a gas-liquid distribution flow field structure.
Background
The conductive partition plate is one of the core components of the electrolytic hydrogen production electrolytic cell, and directly influences the electrolytic efficiency, the electrolytic energy consumption, the electrolytic cost and the service life of the electrolytic cell.
The existing water electrolysis hydrogen production conductive partition plate is complex in structure and comprises a main structure module, a plate frame module, a sealing structure and other multi-structure modules. These structural modules are often manufactured separately as individual components. The conductive partition plate has complex processing flow and high positioning precision requirement, and brings inconvenience to batch production and assembly of the conductive partition plate. In addition, the plate frame assembly processed independently needs to be bonded and welded to be connected with the main body of the conductive partition plate, and the connection mode can cause the problems of infirm connection mode, overlarge flatness deformation of the conductive partition plate and the like, so that the operation of the electrolytic cell under the heating and high-pressure operation conditions is not facilitated.
Specifically, the existing conductive separator plates for water electrolysis mainly have the following problems: firstly, the plate frame assembly of the conductive partition plate needs to be processed independently, so that the same processing needs to be repeated on the plate frame assembly and the main body of the conductive partition plate, and the processing cost is increased; secondly, the positioning precision requirements of the positions of the positioning holes of the conductive partition plate and the positioning holes of the main body of the conductive partition plate are high, so that high assembly difficulty is caused; thirdly, the existing sealing glue slot of the conductive partition plate needs to be reinforced in a bonding or welding mode, so that the processing flow of the conductive partition plate is complicated, and the reliability of the sealing function of the conductive partition plate under the high-pressure operation of an electrolytic cell cannot be ensured; and fourthly, in the galvanic pile of the filter press structure, the sealing interfaces of the equipment are more, and the risk of substance leakage in the galvanic pile is high. The conductive separator plate prepared by the existing whole conductive separator plate preparation process is mostly used for fuel cells, and mostly adopts the forms of stamping and mould pressing, and the stamping and mould pressing can cause that both sides of the whole conductive separator plate are provided with corresponding groove ridge structures, so that the structure is not suitable for water electrolysis.
Disclosure of Invention
In order to solve the problems, the invention provides a conductive partition plate with a gas-liquid distribution flow field structure and a preparation method thereof.
The technical scheme of the invention is as follows:
on one hand, the invention provides a preparation method of a conductive partition plate with a gas-liquid distribution flow field structure, wherein the conductive partition plate is processed and molded by a 3D printing method; the 3D printing method comprises the following steps:
a. three-dimensional modeling: making a three-dimensional model image of the conductive partition plate to be printed in a computer, and carrying out two-dimensional slicing processing on the three-dimensional model image;
b. preparing a printing material;
c. inputting the modeling graph in the step a into a 3D printing program according to a format; b, conveying the printing material prepared in the step b into printing equipment, alternately printing, stacking and forming the printing material through the mutual matching action of a printing nozzle and a printing platform in the printing equipment, and obtaining the conductive partition plate with the whole plate structure after printing;
d. c, sending the conductive partition plate printed in the step c out of the printing system;
the step a and the step b are not in sequence.
Based on the scheme, the printing material is preferably prepared by mixing spherical titanium powder and a binder.
Based on the scheme, preferably, the ratio of the spherical titanium powder to the binder is 10: 1-5: 1; the particle size of the spherical titanium powder is 50-200 microns.
Based on the scheme, the ratio of the spherical titanium powder to the binder is preferably 10: 1; the particle size of the spherical titanium powder is 50 microns.
On the other hand, the invention provides the conductive partition plate with the gas-liquid distribution flow field structure, which is prepared by the method, wherein the conductive partition plate is of an integral plate structure; one side of the conductive separator plate is provided with an anode flow field, and the other side of the conductive separator plate is provided with a cathode flow field; and an anode material inlet and an anode material outlet and a cathode material inlet and an outlet are arranged at two ends of the conductive separator.
Based on the scheme, preferably, sealant slots are formed in the peripheries of the inlet and the outlet and the flow field; and a bridge passing area is arranged between the anode material inlet and outlet and the anode flow field and is used for communicating the anode material inlet and outlet and the anode flow field.
Based on the above scheme, preferably, the four corners of the conductive partition plate are provided with positioning holes for fixing the conductive partition plate with an external structure.
Based on the above scheme, preferably, the anode material inlet and outlet are respectively located at two ends of the width direction of the conductive partition plate and are centrosymmetric; the cathode material inlet and outlet are respectively positioned at two ends of the width direction of the conductive partition plate and are centrosymmetric.
Based on the above scheme, preferably, the anode material inlet and outlet and the cathode material inlet and outlet are rectangular.
Based on the above scheme, preferably, the anode flow field is linear, and the anode flow field includes a plurality of flow channels parallel to each other; the cathode flow field is a planar region.
Among the above-mentioned electrically conductive division board, the sheet frame subassembly no longer separates with electrically conductive division board main part, but as the partly of electrically conductive division board, integrated into one piece machine-shaping.
The cathode/anode material inlet and outlet, the positioning hole, the gap bridge area and the conductive separator main body in the plate frame assembly are integrally formed, and the structure identical to that of the conductive separator main body is not required to be repeatedly processed.
The sealing rubber line groove and the conductive partition plate main body are integrally formed, and the sealing rubber line groove is not required to be fixed on the conductive partition plate main body in an additional connection mode.
The conductive separator prepared by the method can be applied to fuel cells, renewable fuel cells, photoelectrocatalysis devices, electrolytic hydrogen generator devices or electrochemical hydrogen compressors.
The preparation method provided by the invention greatly simplifies the processing link of the conductive partition plate, improves the structural stability of the conductive partition plate, reduces the joint interface of the sealing structure and reduces the leakage risk of substances in the galvanic pile.
Advantageous effects
1. The conductive partition plate prepared by the method provided by the invention is integrally processed and formed, has no independent plate frame component and is of a whole plate structure; the plate frame assembly of the traditional water electrolysis conductive partition plate is separated from the main body of the conductive partition plate, and structures such as an oxygen and electrolyte inlet, an oxygen and electrolyte outlet, a hydrogen inlet and outlet, a sealing glue line groove, a positioning hole, a bridge passing area and the like need to be processed independently.
2. The conductive partition plate processed by the method provided by the invention is different from the conductive partition plate integrated with the fuel cell in that: the integrated conductive partition plate of the fuel cell still needs to be formed by respectively processing and combining two unipolar plates, and the conductive partition plate obtained by the technical scheme is of an integral plate structure with only a single plate and does not need to be formed by two unipolar plates.
3. The conductive separator plate processed by the method provided by the invention is different from the traditional fuel cell and electrolytic cell separator plates in that: in the galvanic pile of pressure filter structure, adopt this technical scheme's division board can reduce the sealed leakage risk face of equipment to half of original quantity, greatly reduced galvanic pile leakage risk.
4. According to the invention, the sealing rubber wire groove, the diversion groove and the flow field are all processed on the main body material of the partition plate; the water electrolysis conductive partition plate integrally forms all functional areas of the conductive partition plate; the assembly process is simplified, the processing difficulty of the polar plate is reduced, and the assembly quality and the positioning precision of the pore channel are ensured; and the whole plate-formed polar plate does not need to independently reinforce the sealing glue slot, so that the high-pressure operation stability of the electrolytic cell can be ensured.
5. Compared with the conductive partition plate processed by the traditional process, the conductive partition plate obtained by the preparation method provided by the invention has the advantages that the assembly quality and the positioning precision of the galvanic pile are ensured; the conductive partition plate optimized by the method has better performance when being used for a Proton Exchange Membrane (PEM) water electrolytic cell; the conductive separator plate provided by the invention has wide application value in fuel cells, renewable fuel cells, photoelectrocatalysis, electrolytic hydrogen generator devices and electrochemical hydrogen compressors.
Drawings
FIG. 1 is a schematic view of a conductive separator plate (oxygen side) with a gas-liquid distribution flow field structure;
FIG. 2 is a schematic diagram of a conductive separator plate (hydrogen side) with a gas-liquid distribution flow field structure;
FIG. 3 is an exploded view of a prior art conductive separator plate;
FIG. 4 is a schematic view of a conductive separator plate with gas-liquid channels and a non-distribution flow field structure;
FIG. 5 is a schematic diagram of a stack leakage risk interface structure;
in the figure, 1, a cathode/anode material inlet and outlet; 2. sealing the glue line groove; 3. a flow field region; 4. positioning holes; 5. a bridging region; 6. a plate frame assembly; 7. a conductive separator plate body; 8. and (4) a material leakage risk surface inside the galvanic pile.
Detailed Description
The following detailed description will be made with reference to the drawings and examples to explain how to apply the technical means to solve the technical problems and to fully understand the implementation process of achieving the technical effects.
Example 1
The 3D printing processing method based on the conductive separation plate with the gas-liquid distribution flow field structure comprises the following steps:
1. three-dimensional modeling: designing the shape, section shape and the like of each functional area according to the shape and size of the conductive partition plate to be printed; making a three-dimensional model image of the designed conductive partition plate in a computer, and carrying out two-dimensional slicing processing on the three-dimensional model image;
2. preparing a printing material: preparing spherical titanium powder with the particle size of 50 microns and a binder into a printing material according to the proportion of 10: 1;
3. inputting the modeling graph in the step 1 into a 3D printing program according to a format, sending the printing material prepared in the step 2 into printing equipment, enabling a printing nozzle in the printing equipment to be matched with a printing platform to act, and alternately printing, stacking and molding the printing material prepared in the step 2;
4. and (3) starting the conveying action of the printing platform by the control component, operating the printing platform to send the conductive partition plate printed and formed in the step (3) out of the printing system, and finishing printing to obtain a conductive partition plate A (the structure is shown in figure 1) with a gas-liquid distribution flow field.
The conductive separation plate A is of an integral plate structure, one surface of the conductive separation plate A is an oxygen and electrolyte flow field (namely an anode flow field), and the other surface of the conductive separation plate A is a hydrogen flow field (namely a cathode flow field); an anode material inlet and outlet (namely an inlet and outlet of a gas-liquid mixture of oxygen and electrolyte) and a cathode material inlet and outlet (namely a hydrogen inlet and outlet) are arranged at two ends of the conductive separator plate A; the anode material inlet and the anode material outlet are respectively positioned at two ends of the width direction of the conductive partition plate and are centrosymmetric; the cathode material inlet and outlet are respectively positioned at two ends of the width direction of the conductive partition plate and are centrosymmetric; the anode material inlet and outlet and the cathode material inlet and outlet are rectangular.
And positioning holes 4 are formed in four corners of the conductive partition plate A and used for fixing the conductive partition plate with an external structure.
The anode flow field is linear and comprises a plurality of parallel flow channels; the cathode flow field is a planar region.
A galvanic pile A is assembled by 10 sections of conductive partition plates prepared according to the steps, and the sealing performance test is carried out, wherein the operation method comprises the following steps:
a15 MPa gas cylinder is connected with a galvanic pile through a pressure-resistant pipeline, an exhaust valve is required to be added on one side of the galvanic pile, a stop valve and a pressure gauge are required to be added at the front end of a gas cylinder pressure reducing valve, and helium gas with different pressures is adopted for pressure sealing test.
The test result shows that the galvanic pile A has no leakage and no obvious sealing failure condition at 5 MPa.
Comparative example 1
In order to realize the high-pressure gas sealing of more than 5MPa, the roughness of the bottom plane of a sealing glue slot of the metal conductive partition plate needs to be finely adjusted, and the adjusting process is as follows:
the conductive separator plate B with a flow field was processed according to the procedure described in example 1, except that: when a sealing rubber wire groove on the conductive partition plate B is processed, the grain diameter of spherical titanium powder in the used printing material is 200 microns.
The prepared conductive partition board B and the conductive partition board A prepared in the embodiment 1 are respectively assembled to form a ten-section galvanic pile for sealing performance test, the assembling mode is the same as that of the embodiment 1, and the comparative test result shows that the galvanic pile B leaks under 4.5MPa, and the galvanic pile A can still maintain good sealing performance under 5.5MPa, so that no obvious sealing failure condition exists.
Comparative example 2
In order to highlight that the conductive separation plate prepared by the method has advantages in the aspect of galvanic pile sealing compared with the conductive separation plate processed by the traditional method, the two methods are compared, and the operation method is as follows:
1. an electrolytic cell stack A is assembled by adopting 10 sections of the conductive partition plates prepared in the embodiment 1 and other necessary components, and an electrolytic cell stack C is assembled by adopting 10 sections of combined conductive partition plates (shown in figure 2) prepared by the traditional process with the same size and other necessary components;
2. both stack a and stack C were assembled as follows: connecting a 15MPa gas cylinder with a galvanic pile by using a pressure-resistant pipeline, adding an exhaust valve on one side of the galvanic pile, adding a stop valve and a pressure gauge at the front end of a gas cylinder pressure reducing valve, and performing pressure sealing test by adopting helium gas with different pressures;
the results of comparison tests show that the galvanic pile C leaks under 2.5MPa, a sealing element extrudes, and the galvanic pile A can still keep good sealing performance under 5.5MPa without obvious sealing failure.
Claims (3)
1. The preparation method of the conductive partition plate with the gas-liquid distribution flow field structure is characterized in that the method is a 3D printing method, and the 3D printing method comprises the following steps:
a. three-dimensional modeling: making a three-dimensional model image of the conductive partition plate to be printed in a computer, and carrying out two-dimensional slicing processing on the three-dimensional model image;
b. preparing a printing material;
c. inputting the modeling graph in the step a into a 3D printing program according to a format; b, conveying the printing material prepared in the step b into printing equipment, alternately printing, stacking and forming the printing material through the mutual matching action of a printing nozzle and a printing platform in the printing equipment, and obtaining the conductive partition plate with the whole plate structure after printing;
d. c, sending the conductive partition plate printed in the step c out of the printing system;
the step a and the step b are not in sequence;
the printing material is prepared by mixing spherical titanium powder and a binder; the ratio of the spherical titanium powder to the binder is 10: 1; the particle size of the spherical titanium powder is 50 microns;
the conductive partition plate is of a whole plate structure; one side of the conductive separator plate is provided with an anode flow field, and the other side of the conductive separator plate is provided with a cathode flow field; an anode material inlet and an anode material outlet and a cathode material inlet and an anode material outlet are formed at two ends of the conductive separator;
sealant slots are arranged at the periphery of each inlet and outlet and the flow field; a bridge area is arranged between the anode material inlet and outlet and the anode flow field and is used for communicating the anode material inlet and outlet with the anode flow field; the cathode flow field is a planar region.
2. A conductive separator plate with a gas-liquid distribution flow field structure, wherein the conductive separator plate is prepared by the method of claim 1.
3. Use of the electrically conductive separator of claim 2 in a fuel cell, a photo-catalytic device, an electrolytic hydrogen generator device, or an electrochemical hydrogen compressor.
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Families Citing this family (2)
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| WO2022057551A1 (en) * | 2020-09-21 | 2022-03-24 | 中国科学院大连化学物理研究所 | Pem electrolytic cell conductive partition plate having gas-liquid distribution flow field structure |
| CN116454311A (en) * | 2023-06-16 | 2023-07-18 | 国家电投集团氢能科技发展有限公司 | Integrally formed fuel cell clamp, manufacturing method thereof and fuel cell |
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