CN112829486A - Printing slurry, bipolar plate flow field using same and processing method thereof - Google Patents
Printing slurry, bipolar plate flow field using same and processing method thereof Download PDFInfo
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- CN112829486A CN112829486A CN202110091241.1A CN202110091241A CN112829486A CN 112829486 A CN112829486 A CN 112829486A CN 202110091241 A CN202110091241 A CN 202110091241A CN 112829486 A CN112829486 A CN 112829486A
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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
- B41M1/125—Stencil printing; Silk-screen printing using a field of force, e.g. an electrostatic field, or an electric current
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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
- H01M8/0263—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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- 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
- H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses printing slurry, a bipolar plate flow field using the printing slurry and a processing method of the bipolar plate flow field, and belongs to the technical field of flow plate processing technologies. The method specifically comprises the following steps: s1, designing parameters of the flow field structure, including: the width of a flow channel, the depth of the flow channel, the width of a ridge and the period of a flow field; and S2, screen printing the conductive material on the conductive substrate to form the bipolar plate flow field for the fuel cell. The invention replaces the die stamping process in the prior art by screen printing, reduces the die opening cost, and can increase the precision of the bipolar plate flow channel molding, thereby being convenient for realizing large-scale production.
Description
Technical Field
The invention belongs to the technical field of flow plate processing technology, and particularly relates to printing slurry, a bipolar plate flow field using the printing slurry and a processing method thereof.
Background
The bipolar plates for fuel cells are mainly classified into metal bipolar plates, graphite bipolar plates, and composite bipolar plates. Bipolar plates are a very critical component, accounting for about 80% of the weight of the PEMFC cell, and about 24% of the cost. The performance and cost of the battery are influenced, one of bottlenecks restricting the industrialization of the hydrogen fuel battery at the cost is reached, and the aspects of the service life, the performance, the volume, the cost, the quality and the like of the battery are directly influenced and restricted. The working principle of the device is mainly to conduct electrons, distribute reaction gas and take away generated water.
Most foreign manufacturers of graphite bipolar plate flow fields adopt a production mode of die-casting molding or expanded graphite molding. Most domestic manufacturers adopt the mode of artificial graphite machining to realize, the cost is high, and mass production is not easy to realize. The metal bipolar plate is usually stamped by a die, the process precision is difficult to control, the forming shape is limited to a certain extent, and the structural development of a bipolar plate flow channel is greatly restrained. The composite bipolar plate has the highest requirement on the process and the lowest corresponding technical maturity, is still in the research and development stage and the small-amount production stage at present, and cannot realize large-scale commercialization.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention develops printing slurry, a bipolar plate flow field prepared by using the printing slurry and a processing method thereof.
The invention adopts the following technical scheme: a novel bipolar plate flow field processing method for a fuel cell specifically comprises the following steps:
s1, designing parameters of the flow field structure, including: the width of a flow channel, the depth of the flow channel, the width of a ridge and the period of a flow field;
and S2, screen printing the conductive printing slurry on the conductive substrate to form the bipolar plate flow field for the fuel cell.
In further embodiments, the flow field structures include a direct flow field, a criss-cross flow field, a serpentine flow field, a biomimetic flow field, a staggered flow field, a serial serpentine flow field, a hybrid serpentine flow field, a cobra flow field, a mesh flow field, and a wavy flow field.
In a further embodiment, the step S2 specifically includes the following steps:
s201, screen plate manufacturing: selecting a 10-500-mesh screen plate, and manufacturing the flow field screen plate according to a flow field structure;
s202, conducting screen printing on the conductive printing slurry and the screen plate basically in a conductive mode, and controlling the printing times to process flow field structures with different groove depths;
and S203, processing the printed conductive substrate in a high-temperature environment to prepare the bipolar plate flow field.
In a further embodiment, the parameters of the screen printing in S202 are: the precision of a printing platform is less than or equal to 0.03mm, the printing pressure is 0.6-0.8 kg/cm2, the angle of a scraper is 50-80 degrees, the static distance between a silk screen and a printing stock is 3-10 mm, and the printing speed is controlled at 50-200 mm/s.
In a further embodiment, when the conductive substrate is made of a non-metallic conductive material, the high temperature environment in S203 is: drying at 25-80 deg.c for 2-3 hr, and sintering at 500-1000 deg.c for 2-3 hr; the sintering atmosphere is inert gas such as nitrogen, argon and the like or vacuum environment;
wherein the non-metallic conductive material is: carbon black, graphitized carbon, graphene and carbide, nitride conductive materials;
when the conductive substrate is made of a metal material, the high-temperature environment in S203 is: sintering the mixture for 1 to 3 hours at the temperature of 800 ℃ in air at 500-; then sintering the mixture for 2 to 5 hours at the temperature of 500 ℃ and 1000 ℃ in mixed atmosphere;
wherein the metal material is: gold, silver, iron, copper, nickel, aluminum, cobalt, chromium, manganese, zinc, ruthenium, rhodium, palladium, platinum or iridium metal.
In a further embodiment, the printing paste comprises: fillers, binders and organic carriers;
the filler is as follows: a metallic material or a non-metallic material;
the adhesive is as follows: boric silicon glass, aluminate silicon glass, CuO, CdO and Bi2O3Or epoxy acrylic acid;
the organic carrier is as follows: terpineol, butyl cellosolve, butyl carbitol, dibutyl phthalate, celluloses or acrylics.
A printing paste for preparing a bipolar plate flow field for a fuel cell as described above, comprising: fillers, binders and organic carriers;
wherein the viscosity range of the slurry is as follows: 1000cps to 20000 cps; particle range of the slurry: 50nm-1000 nm. The preferred viscosity range is 5000 cps to 10000 cps, more preferably 6000 cps to 800 cps.
In a further embodiment, the filler is: a metallic material or a non-metallic material;
the adhesive is as follows: boric silicon glass, aluminate silicon glass, CuO, CdO and Bi2O3Or epoxy acrylic acid;
the organic carrier is as follows: terpineol, butyl cellosolve, butyl carbitol, dibutyl phthalate, celluloses or acrylics;
uniformly stirring the filler, the binder and the organic carrier at the rotating speed of 100-200rpm, and defoaming the stirred slurry for 15-30min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 25-30 ℃.
In a further embodiment, when the filler is a metal material, the mass percentages of the filler, the binder and the organic vehicle are as follows: 70 to 80 percent
1%-7%
10%-25%；
When the filler is a non-metallic conductive material, the mass percent of the filler, the binder and the organic carrier is 50-70%
0%
30%-50%。
A bipolar plate flow field, which is manufactured by the bipolar plate flow field processing method;
the structure of the flow field comprises a direct flow field, a cross flow field, a snake-shaped flow field, a bionic flow field, a mixed flow field, a serial snake-shaped flow field, a mixed snake-shaped flow field, a cobra-shaped flow field, a reticular flow field and a wave flow field.
The invention has the beneficial effects that: the invention replaces the die stamping process in the prior art by screen printing, reduces the die opening cost, and can increase the precision of the bipolar plate flow channel molding, thereby being convenient for realizing large-scale production.
Drawings
Fig. 1 is a flow field structural view of example 6.
Fig. 2 is a flow field structural view of example 7.
Fig. 3 is a flow field structural view of example 8.
Fig. 4 is a flow field structural view of example 9.
Each of fig. 1 to 4 is labeled as: flow field 1, ridge 2.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
A novel bipolar plate flow field processing method for a fuel cell specifically comprises the following steps:
s1, designing parameters of the flow field structure, including: the width of a flow channel, the depth of the flow channel, the width of a ridge and the period of a flow field;
and S2, screen printing the conductive material on the conductive substrate to form the bipolar plate flow field for the fuel cell.
In a further embodiment, the width of the flow channel of the flow field is 0.3-1.5 mm, the depth of the flow channel of the flow field is 0.3-1.5 mm, the ridge width of the flow field is 0.3-1.5 mm, and the period of the flow field is 0.6-3 mm.
In a further embodiment, the step S2 specifically includes the following steps:
s201, screen plate manufacturing: selecting a 10-500-mesh screen plate, and manufacturing the flow field screen plate according to a flow field structure;
s202, screen printing is carried out on the conductive material and the screen plate basically during the conduction, and the flow field structures with different groove depths are processed by controlling the printing times;
and S203, processing the printed conductive substrate in a high-temperature environment to prepare the bipolar plate flow field.
In a further embodiment, the parameters of the screen printing in S202 are: the precision of the printing platform is less than or equal to 0.03mm, and the printing pressure is 0.6-0.8 kg/cm2The angle of the scraper is 50-80 degrees, the static distance between the silk screen and the printing stock is 3-10 mm, and the printing speed is controlled at 50-200 mm/s.
In a further embodiment, when the conductive substrate is made of a non-metallic conductive material, the high temperature environment in S203 is: drying at 25-80 deg.c for 2-3 hr, and sintering at 500-1000 deg.c for 2-3 hr; the sintering atmosphere is inert gas such as nitrogen, argon and the like or vacuum environment;
wherein the non-metallic conductive material is: carbon black, graphitized carbon, graphene, etc., and carbide and nitride conductive materials.
In a further embodiment, when the conductive substrate is made of a metal material, the high temperature environment in S203 is: sintering the mixture for 1 to 3 hours at the temperature of 800 ℃ in air at 500-; then sintering the mixture for 2 to 5 hours at the temperature of 500 ℃ and 1000 ℃ in mixed atmosphere;
wherein the metal material is: gold, silver, iron, copper, nickel, aluminum, cobalt, chromium, manganese, zinc, ruthenium, rhodium, palladium, platinum or iridium metal.
A printing paste for preparing a bipolar plate flow field for a fuel cell as described above, comprising: fillers, binders and organic carriers;
wherein the viscosity range of the slurry is as follows: 1000cps to 20000 cps; particle range of the slurry: 50nm-1000 nm. The preferred viscosity range is 5000 cps to 10000 cps, more preferably 6000 cps to 800 cps.
In a further embodiment, the filler is: a metallic material or a non-metallic material;
the adhesive is as follows: boric silicon glass, aluminate silicon glass, CuO, CdO and Bi2O3Or epoxy acrylic acid; the adhesive strength of the printing layer and the base material and the physical and chemical properties of the printing layer are ensured.
The organic carrier is as follows: terpineol, butyl cellosolve, butyl carbitol, dibutyl phthalate, celluloses or acrylics; the slurry rheology and initial adhesion to the substrate are controlled.
Uniformly stirring the filler, the binder and the organic carrier at the rotating speed of 100-200rpm, and defoaming the stirred slurry for 15-30min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 25-30 ℃.
In a further embodiment, when the filler is a metal material, the mass ratio of the filler, the binder and the organic vehicle is: 70 to 80 percent
1%-7%
10% -25%; the metal material is gold, silver, iron, copper, nickel, aluminum, cobalt, chromium, manganese, zinc, ruthenium, rhodium, palladium, platinum, iridium metal or corresponding alloy.
When the filler is a non-metallic conductive material, the mass ratio of the filler, the binder and the organic carrier is 50-70%
0%
30 to 50 percent. The non-metal conductive material is a carbon material, such as: carbon black, graphitized carbon, graphene, etc., and carbide and nitride conductive materials.
A bipolar plate flow field, which is manufactured by the bipolar plate flow field processing method;
the structure of the flow field comprises a direct flow field, a cross flow field, a snake-shaped flow field, a bionic flow field, a mixed flow field, a serial snake-shaped flow field, a mixed snake-shaped flow field, a cobra-shaped flow field, a reticular flow field and a wave flow field.
The inventor finds out through research that: most foreign manufacturers of graphite bipolar plate flow fields adopt a production mode of die-casting molding or expanded graphite molding. Most domestic manufacturers adopt the mode of artificial graphite machining to realize, the cost is high, and mass production is not easy to realize. The metal bipolar plate is usually stamped by a die, the process precision is difficult to control, the forming shape is limited to a certain extent, and the structural development of a bipolar plate flow channel is greatly restrained. The composite bipolar plate has the highest requirement on the process and the lowest corresponding technical maturity, is still in the research and development stage and the small-amount production stage at present, and cannot realize large-scale commercialization.
In order to solve the above problems, the inventors developed a novel method for processing a bipolar plate flow field for a fuel cell, which is described by way of example.
Example 1
Preparing printing slurry: selecting carbon black as a filler and terpineol as an organic carrier, uniformly stirring 108g of the filler and 108g of the organic carrier at the rotating speed of 150rpm, and defoaming the stirred slurry for 22min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 26 ℃. The slurry particles with the particle size range of 500nm are screened out to be used as printing slurry.
Example 2
Preparing printing slurry: selecting graphitized carbon as a filler and butyl cellosolve as an organic carrier, uniformly stirring 130g of the filler and 86g of the organic carrier at the rotating speed of 150rpm, and defoaming the stirred slurry for 22min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 26 ℃. The printing paste was obtained by screening out particles of the paste having a particle size in the range of 550 nm.
Example 3
Preparing printing slurry: selecting graphene as a filler and butyl carbitol as an organic carrier, uniformly stirring 151g of the filler and 65g of the organic carrier at the rotating speed of 150rpm, and defoaming the stirred slurry for 22min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 26 ℃. The slurry particles with the particle size range of 500nm are screened out to be used as printing slurry.
Example 4
Preparing printing slurry: selecting aluminum or cobalt as a filler, boric acid silicate glass as a binder and dibutyl phthalate as an organic carrier, uniformly stirring 151g of the filler, 15.12g of the binder and 49.68g of the organic carrier at the rotating speed of 150rpm, and defoaming the stirred slurry for 22min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 26 ℃. The printing paste was obtained by screening out paste particles having a particle size in the range of 520 nm.
Example 5
Preparing printing slurry: selecting gold or silver as a filler, oxyacrylic acid as a binder and acrylic acid as an organic carrier, uniformly stirring 162g of the filler, 10.8g of the binder and 43.2g of the organic carrier at the rotating speed of 150rpm, and defoaming the stirred slurry for 22min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 26 ℃. And screening out slurry particles with the particle size range of 500nm-550nm as printing slurry.
Example 6
Taking the printing paste prepared in example 5 as an example, the printing paste is used for preparing a bipolar plate flow field, and specifically comprises the following steps:
s1, designing parameters of a flow field structure: the width of the flow field is 0.3mm, the depth of the flow channel is 1.2mm, the ridge width of the flow field is 0.5mm, and the period of the flow field is 2.4 mm;
and S2, screen printing the conductive material on the conductive substrate to form the bipolar plate flow field for the fuel cell.
The method specifically comprises the following steps:
s201, screen plate manufacturing: selecting a 400-mesh screen plate, and manufacturing a flow field screen plate according to a flow field structure; the screen plate with the same structure as the flow field can be manufactured conveniently with high precision.
S202, screen printing is carried out on the conductive material and the screen plate basically during the conduction, and the flow field structures with different groove depths are processed by controlling the printing times; selecting graphitized carbon as a conductive material;
the parameters of the screen printing in S202 are as follows: the precision of the printing platform is less than or equal to 0.03mm, and the printing pressure is 0.7kg/cm2The scraper angle is 65 degrees, the static distance between the silk screen and the printing stock is 7mm, and the printing speed is controlled at 160 mm/s.
S203, drying the printed conductive substrate at 56 ℃ for 1.5 hours, and then sintering at 800 ℃ for 2.5 hours; the sintering atmosphere is inert gases such as nitrogen, argon and the like; and preparing the bipolar plate flow field.
The flow field structure in this embodiment is a serpentine flow field as shown in fig. 1.
Example 7
Taking the printing paste prepared in the embodiment 4 as an example, the printing paste is used for preparing a bipolar plate flow field, and specifically comprises the following steps:
s1, designing parameters of a flow field structure: the width of the flow field is 0.6mm, the depth of the flow channel is 0.8mm, the ridge width of the flow field is 0.9mm, and the period of the flow field is 1.5 mm;
and S2, screen printing the conductive material on the conductive substrate to form the bipolar plate flow field for the fuel cell.
The method specifically comprises the following steps:
s201, screen plate manufacturing: selecting a 60-mesh screen plate, and manufacturing a flow field screen plate according to a flow field structure; the screen plate with the same structure as the flow field can be manufactured conveniently with high precision.
S202, screen printing is carried out on the conductive material and the screen plate basically during the conduction, and the flow field structures with different groove depths are processed by controlling the printing times; selecting nickel as a conductive substrate;
the parameters of the screen printing in S202 are as follows: the precision of the printing platform is less than or equal to 0.03mm, and the printing pressure is 0.7kg/cm2The scraper angle is 65 degrees, the static distance between the silk screen and the printing stock is 7mm, and the printing speed is controlled at 160 mm/s.
S203, sintering the printed conductive substrate for 2 hours at 650 ℃ in the air; then sintering the mixture for 3.5 hours at 700 ℃ in mixed atmosphere; and preparing the bipolar plate flow field. Wherein, the mixed atmosphere is the mixed gas of hydrogen nitrogen, hydrogen argon and hydrogen helium, and the hydrogen concentration is 5-100%.
The flow field structure in this embodiment is a serpentine flow field as shown in fig. 1.
Example 7
Taking the printing paste prepared in example 3 as an example, the printing paste is used for preparing a bipolar plate flow field, and specifically comprises the following steps:
s1, designing parameters of a flow field structure: the width of the flow field is 0.6mm, the depth of the flow channel is 0.8mm, the ridge width of the flow field is 0.9mm, and the period of the flow field is 1.5 mm;
and S2, screen printing the conductive material on the conductive substrate to form the bipolar plate flow field for the fuel cell.
The method specifically comprises the following steps:
s201, screen plate manufacturing: selecting a 60-mesh screen plate, and manufacturing a flow field screen plate according to a flow field structure; the screen plate with the same structure as the flow field can be manufactured conveniently with high precision.
S202, screen printing is carried out on the conductive material and the screen plate basically during the conduction, and the flow field structures with different groove depths are processed by controlling the printing times; selecting nickel as a conductive substrate;
the parameters of the screen printing in S202 are as follows: the precision of the printing platform is less than or equal to 0.03mm, and the printing pressure is 0.7kg/cm2The scraper angle is 65 degrees, the static distance between the silk screen and the printing stock is 7mm, and the printing speed is controlled at 160 mm/s.
S203, sintering the printed conductive substrate for 2 hours at 650 ℃ in the air; then sintering the mixture for 3.5 hours at 700 ℃ in mixed atmosphere; and preparing the bipolar plate flow field. Wherein, the mixed atmosphere is the mixed gas of hydrogen nitrogen, hydrogen argon and hydrogen helium, and the hydrogen concentration is 5-100%.
The flow field structure in this embodiment is a wavy flow field as shown in fig. 2.
Example 8
Taking the printing paste prepared in the embodiment 2 as an example, the printing paste is used for preparing a bipolar plate flow field, and specifically comprises the following steps:
s1, designing parameters of a flow field structure: the width of the flow field 1 is 0.3mm, the depth of the flow channel 2 is 1.5mm, the ridge width of the flow field 1 is 0.3mm, and the period of the flow field 2 is 3 mm;
and S2, screen printing the conductive material on the conductive substrate to form the bipolar plate flow field for the fuel cell.
The method specifically comprises the following steps:
s201, screen plate manufacturing: selecting 250 meshes of screen plates, and manufacturing the flow field screen plates according to the flow field structure; the screen plate with the same structure as the flow field can be manufactured conveniently with high precision.
S202, screen printing is carried out on the conductive material and the screen plate basically during the conduction, and the flow field structures with different groove depths are processed by controlling the printing times; selecting manganese as a conductive substrate;
the parameters of the screen printing in S202 are as follows: the precision of the printing platform is less than or equal to 0.03mm, and the printing pressure is 0.7kg/cm2Scraper angle 65 °, static state of screen and stockThe distance is 7mm, and the printing speed is controlled at 160 mm/s.
S203, sintering the printed conductive substrate for 2 hours at 650 ℃ in the air; then sintering the mixture for 3.5 hours at 700 ℃ in mixed atmosphere; and preparing the bipolar plate flow field. Wherein the mixed atmosphere is a mixed gas of hydrogen and nitrogen, hydrogen and argon, and hydrogen and helium, and the concentration of hydrogen is 5% -100%, such as 5%, 21.5%, 35%, 46%, 80% or 99%.
The flow field configuration in this embodiment is shown in fig. 3 as a series serpentine flow field.
Example 9
Taking the printing paste prepared in example 1 as an example, a bipolar plate flow field is prepared by using a 3D printing process,
the process parameters used were as follows: the laser power is 250-500W (250W, 260W, 420W and 500W), the spot diameter is 0.1mm, the scanning speed is 1 m/s-10 m/s (for example, 1m/s, 2 m/s, 5 m/s, 7 m/s, 8 m/s and 10 m/s), and the powder spreading thickness h is 10-50 um (for example, 10 um, 15 um, 20 um, 28 um, 32 um, 38 um, 43 um and 50 um); working atmosphere: ar, N2(ii) a The working oxygen content is less than or equal to 100 ppm;
the relationship among the flow channel depth H, the printing times n and the powder spreading thickness H is as follows:
。
the bionic flow field as shown in fig. 4 can be prepared, and different flow channel widths and flow channel depths can be controlled.
The bipolar plate flow field prepared in this embodiment may include various structures, such as a direct flow field, a crisscross flow field, a serpentine flow field, a biomimetic flow field, a staggered flow field, a serial serpentine flow field, a hybrid serpentine flow field, a cobra flow field, a mesh flow field, and a wavy flow field. It is to achieve low cost mass production by optimizing the screen and printing paste.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A novel bipolar plate flow field processing method for a fuel cell is characterized by comprising the following steps:
s1, designing parameters of the flow field structure, including: the width of a flow channel, the depth of the flow channel, the width of a ridge and the period of a flow field;
and S2, screen printing the conductive printing slurry on the conductive substrate to form the bipolar plate flow field for the fuel cell.
2. The method of claim, wherein the flow field structure comprises a straight flow field, a criss-cross flow field, a serpentine flow field, a biomimetic flow field, a staggered flow field, a serial serpentine flow field, a hybrid serpentine flow field, a cobra flow field, a mesh flow field, and a wavy flow field.
3. The method as claimed in claim, wherein the step S2 includes the following steps:
s201, screen plate manufacturing: selecting a 10-500-mesh screen plate, and manufacturing the flow field screen plate according to a flow field structure;
s202, conducting screen printing on the conductive printing slurry and the screen plate basically in a conductive mode, and controlling the printing times to process flow field structures with different groove depths;
and S203, processing the printed conductive substrate in a high-temperature environment to prepare the bipolar plate flow field.
4. The method as claimed in claim 1, wherein the screen printing parameters in S202 are as follows: the precision of a printing platform is less than or equal to 0.03mm, the printing pressure is 0.6-0.8 kg/cm2, the angle of a scraper is 50-80 degrees, the static distance between a silk screen and a printing stock is 3-10 mm, and the printing speed is controlled at 50-200 mm/s.
5. The method as claimed in claim 1, wherein when the conductive substrate is made of a non-metallic conductive material, the high temperature environment in S203 is: drying at 25-80 deg.c for 2-3 hr, and sintering at 500-1000 deg.c for 2-3 hr; the sintering atmosphere is inert gas such as nitrogen, argon and the like or vacuum environment;
wherein the non-metallic conductive material is: carbon black, graphitized carbon, graphene and carbide, nitride conductive materials;
when the conductive substrate is made of a metal material, the high-temperature environment in S203 is: sintering the mixture for 1 to 3 hours at the temperature of 800 ℃ in air at 500-; then sintering the mixture for 2 to 5 hours at the temperature of 500 ℃ and 1000 ℃ in mixed atmosphere;
wherein the metal material is: gold, silver, iron, copper, nickel, aluminum, cobalt, chromium, manganese, zinc, ruthenium, rhodium, palladium, platinum or iridium metal.
6. The novel bipolar plate flow field processing method for a fuel cell as claimed in claim 1, wherein the printing paste comprises: fillers, binders and organic carriers;
the filler is as follows: a metallic material or a non-metallic material;
the adhesive is as follows: boric silicon glass, aluminate silicon glass, CuO, CdO and Bi2O3Or epoxy acrylic acid;
the organic carrier is as follows: terpineol, butyl cellosolve, butyl carbitol, dibutyl phthalate, celluloses or acrylics.
7. A printing paste for preparing a bipolar plate flow field for a fuel cell according to claim 1, comprising: fillers, binders and organic carriers;
wherein the viscosity range of the slurry is as follows: 1000cps to 20000 cps; particle range of the slurry: 50nm-1000 nm.
8. The printing paste as claimed in claim 7, wherein the filler is: a metallic material or a non-metallic material;
the adhesive is as follows: boric silicon glass, aluminate silicon glass, CuO, CdO and Bi2O3Or epoxy acrylic acid;
the organic carrier is as follows: terpineol, butyl cellosolve, butyl carbitol, dibutyl phthalate, celluloses or acrylics;
uniformly stirring the filler, the binder and the organic carrier at the rotating speed of 100-200rpm, and defoaming the stirred slurry for 15-30min in a vacuum environment; the vacuum degree is less than or equal to 200 Pa; the defoaming ambient temperature is 25-30 ℃.
9. A printing paste according to claim 8,
when the filler is a metal material, the mass percentages of the filler, the binder and the organic carrier are as follows: 70 to 80 percent
1%-7%
10%-25%；
When the filler is a non-metallic conductive material, the mass percent of the filler, the binder and the organic carrier is 50-70%
0%
30%-50%。
10. A bipolar plate flow field, wherein said bipolar plate flow field is made by the bipolar plate flow field processing method of claim 6;
the structure of the flow field comprises a direct flow field, a cross flow field, a snake-shaped flow field, a bionic flow field, a mixed flow field, a serial snake-shaped flow field, a mixed snake-shaped flow field, a cobra-shaped flow field, a reticular flow field and a wave flow field.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116187029A (en) * | 2023-01-31 | 2023-05-30 | 华南理工大学 | Method for designing fuel cell stack flow channel |
| CN117352767A (en) * | 2023-12-04 | 2024-01-05 | 无锡黎曼机器人科技有限公司 | Flexible adjustment mechanism of snakelike runner board and flow cell snakelike runner assembly systems |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1550050A (en) * | 1999-10-29 | 2004-11-24 | 3M创新有限公司 | Micro-structural flow field |
| CN201466110U (en) * | 2009-03-17 | 2010-05-12 | 北京科技大学 | Snakelike micro-point mixed type flow field for proton exchange membrane fuel cell |
| CN101989625A (en) * | 2009-07-30 | 2011-03-23 | 比亚迪股份有限公司 | Aluminium conductive paste for solar energy battery and preparation method thereof |
| CN102592703A (en) * | 2012-02-13 | 2012-07-18 | 江苏瑞德新能源科技有限公司 | Silver conductor slurry for back electrodes of solar energy battery |
| CN104751938A (en) * | 2013-12-31 | 2015-07-01 | 比亚迪股份有限公司 | Conductive paste for solar battery |
| CN105126931A (en) * | 2015-08-19 | 2015-12-09 | 哈尔滨工业大学 | Catalyst supporting method for methanol-steam reforming hydrogen-producing system |
| CN106299398A (en) * | 2016-09-30 | 2017-01-04 | 新源动力股份有限公司 | A kind of double-deck microporous layers preparation method improving fuel battery performance |
| CN106601327A (en) * | 2016-12-21 | 2017-04-26 | 北京市合众创能光电技术有限公司 | Solar battery front-surface electrode conductive slurry with low solvent volatility and preparation method thereof |
| CN106847374A (en) * | 2017-04-14 | 2017-06-13 | 北京市合众创能光电技术有限公司 | Embedding grid type crystal silicon solar energy battery electrode slurry |
| CN107895804A (en) * | 2017-12-14 | 2018-04-10 | 苏州朔景动力新能源有限公司 | Fuel battery metal double polar plate and fuel cell |
| CN107946605A (en) * | 2017-12-14 | 2018-04-20 | 苏州朔景动力新能源有限公司 | Bipolar plate runner manufacturing process and bipolar plate runner |
| CN109360998A (en) * | 2018-10-22 | 2019-02-19 | 吕伟 | Super thin metal composite dual-electrode plates and preparation method thereof and fuel cell comprising it |
| CN109638310A (en) * | 2017-10-09 | 2019-04-16 | 吕伟 | The ultra-thin composite dual-electrode plates of fuel cell and include its fuel cell |
| CN109950573A (en) * | 2019-04-03 | 2019-06-28 | 武汉科技大学 | A kind of fuel cell flow field board |
-
2021
- 2021-01-22 CN CN202110091241.1A patent/CN112829486B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1550050A (en) * | 1999-10-29 | 2004-11-24 | 3M创新有限公司 | Micro-structural flow field |
| CN201466110U (en) * | 2009-03-17 | 2010-05-12 | 北京科技大学 | Snakelike micro-point mixed type flow field for proton exchange membrane fuel cell |
| CN101989625A (en) * | 2009-07-30 | 2011-03-23 | 比亚迪股份有限公司 | Aluminium conductive paste for solar energy battery and preparation method thereof |
| CN102592703A (en) * | 2012-02-13 | 2012-07-18 | 江苏瑞德新能源科技有限公司 | Silver conductor slurry for back electrodes of solar energy battery |
| CN104751938A (en) * | 2013-12-31 | 2015-07-01 | 比亚迪股份有限公司 | Conductive paste for solar battery |
| CN105126931A (en) * | 2015-08-19 | 2015-12-09 | 哈尔滨工业大学 | Catalyst supporting method for methanol-steam reforming hydrogen-producing system |
| CN106299398A (en) * | 2016-09-30 | 2017-01-04 | 新源动力股份有限公司 | A kind of double-deck microporous layers preparation method improving fuel battery performance |
| CN106601327A (en) * | 2016-12-21 | 2017-04-26 | 北京市合众创能光电技术有限公司 | Solar battery front-surface electrode conductive slurry with low solvent volatility and preparation method thereof |
| CN106847374A (en) * | 2017-04-14 | 2017-06-13 | 北京市合众创能光电技术有限公司 | Embedding grid type crystal silicon solar energy battery electrode slurry |
| CN109638310A (en) * | 2017-10-09 | 2019-04-16 | 吕伟 | The ultra-thin composite dual-electrode plates of fuel cell and include its fuel cell |
| CN107895804A (en) * | 2017-12-14 | 2018-04-10 | 苏州朔景动力新能源有限公司 | Fuel battery metal double polar plate and fuel cell |
| CN107946605A (en) * | 2017-12-14 | 2018-04-20 | 苏州朔景动力新能源有限公司 | Bipolar plate runner manufacturing process and bipolar plate runner |
| CN109360998A (en) * | 2018-10-22 | 2019-02-19 | 吕伟 | Super thin metal composite dual-electrode plates and preparation method thereof and fuel cell comprising it |
| CN109950573A (en) * | 2019-04-03 | 2019-06-28 | 武汉科技大学 | A kind of fuel cell flow field board |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116187029A (en) * | 2023-01-31 | 2023-05-30 | 华南理工大学 | Method for designing fuel cell stack flow channel |
| CN116187029B (en) * | 2023-01-31 | 2023-09-12 | 华南理工大学 | Method for designing fuel cell stack flow channel |
| CN117352767A (en) * | 2023-12-04 | 2024-01-05 | 无锡黎曼机器人科技有限公司 | Flexible adjustment mechanism of snakelike runner board and flow cell snakelike runner assembly systems |
| CN117352767B (en) * | 2023-12-04 | 2024-02-23 | 无锡黎曼机器人科技有限公司 | Flexible adjustment mechanism of snakelike runner board and flow cell snakelike runner assembly systems |
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