CN115602871A - Fuel cell, three-dimensional serpentine flow field bipolar plate and preparation method thereof - Google Patents
Fuel cell, three-dimensional serpentine flow field bipolar plate and preparation method thereof Download PDFInfo
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- CN115602871A CN115602871A CN202211227529.8A CN202211227529A CN115602871A CN 115602871 A CN115602871 A CN 115602871A CN 202211227529 A CN202211227529 A CN 202211227529A CN 115602871 A CN115602871 A CN 115602871A
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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
- H01M8/023—Porous and characterised by the material
- H01M8/0232—Metals or alloys
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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 relates to a fuel cell adopting a double-sided three-dimensional snake-shaped flow field bipolar plate, which comprises a first bipolar plate, a second bipolar plate and a membrane electrode, wherein the membrane electrode is arranged between the first bipolar plate and the second bipolar plate, the first bipolar plate comprises a substrate, a first air inlet, a first air outlet, a second air inlet and a second air outlet, the first air inlet and the first air outlet are arranged in a diagonal manner, a three-dimensional snake-shaped flow field is symmetrically arranged on two sides of the substrate, the second bipolar plate is arranged by turning 180 degrees relative to the first bipolar plate, the first air inlet and the first air outlet of the first bipolar plate are communicated with the double-sided three-dimensional snake-shaped flow field of the first bipolar plate, and the second air inlet and the second air outlet of the first bipolar plate are correspondingly arranged with the first air inlet and the first air outlet of the second bipolar plate and are communicated with the double-sided three-dimensional snake-shaped flow field of the second bipolar plate. By adopting the technical scheme, the volume of the cell stack is reduced, the number of electrochemical reaction areas with the same volume is increased, and the volume power density of the fuel cell is improved.
Description
Technical Field
The invention relates to a bipolar plate of a proton exchange membrane fuel cell, in particular to a fuel cell, a three-dimensional snakelike flow field bipolar plate and a preparation method thereof.
Background
Proton exchange membrane fuel cells are green power generation devices that convert the chemical energy of hydrogen and oxygen directly into electrical energy. The basic principle is that hydrogen and oxygen are respectively supplied to an anode and a cathode by the reverse reaction of electrolytic water, the hydrogen is decomposed into hydrogen ions and electrons in an anode catalyst layer, the hydrogen ions penetrate through a proton exchange membrane to reach the cathode, the electrons reach the cathode through an external circuit, and then the hydrogen ions and the electrons are combined with oxygen at the cathode to generate water. The continuous chemical reaction forces electrons to continuously travel through an external circuit, thereby converting chemical energy into electrical energy.
As the application field of the fuel cell system is gradually expanded, the power demand of the fuel cell system is greatly increased. At present, there are many methods for increasing the power of a fuel cell system, one is to design an efficient flow field structure, and the other is to increase the volumetric power density of the fuel cell. The most common flow field structures of the current fuel cell bipolar plate mainly comprise a parallel flow field, an interdigital flow field and a snake-shaped flow field. The parallel flow field has the characteristic of lower conveying pressure, reaction gas can be fully and freely diffused, but the generated water is easily discharged due to the smaller pressure drop of the parallel flow field, and the water logging phenomenon is formed by the blockage in a flow channel to influence the output performance of the battery; the interdigital flow field is divided into two parts, one part is only responsible for air intake, the other part is only responsible for water drainage, the reaction gas enters the flow channel of the interdigital flow field, and the reaction gas can only be forced to squeeze into the gas diffusion layer due to no outlet, so that forced convection is formed, and the gas utilization rate is greatly improved. But the gas is forced to diffuse, so that a large pressure drop is generated, the gas diffusion layer is damaged when the gas flow rate is too high, and the service performance of the battery is reduced; the serpentine flow field is an improvement on the basis of a parallel flow field, and the serpentine flow field has a right-angled or rounded corner, so that the pressure drop of the flow field is higher than that of the parallel flow field, and generated water can be discharged out of the cell quickly and timely. However, due to the excessive corners of the serpentine flow field, the pressure drop of the flow field is easily caused to be too large, so that the gas supply of the catalytic layer is insufficient and uneven.
At present, the fuel cell stack is large in volume, but the real reaction area is not high, so that the volume power density of the fuel cell is low. The flow field structure of the fuel cell bipolar plate is a two-dimensional structure, and has high cost, poor drainage capability, low gas distribution uniformity and low cell output performance.
In the aspect of preparation process, traditional processing methods such as milling, flexible processing and the like are mostly adopted. However, as the flow field structure of the bipolar plate gradually becomes complicated and highly precise, the traditional processing method cannot meet the preparation requirements due to the defects of low raw material utilization rate, high processing cost, low production efficiency, environmental friendliness and the like.
Disclosure of Invention
In summary, in order to overcome the defects of the prior art, the invention provides a double-sided three-dimensional serpentine flow field bipolar plate with the functions of enhancing the mass transfer of gas and water and improving the management capability of water, gas and heat.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an adopt fuel cell of two-sided three-dimensional snakelike flow field bipolar plate, contains first bipolar plate, the second bipolar plate and membrane electrode the same with first bipolar plate structure, the second bipolar plate sets up between two first bipolar plates, the membrane electrode sets up between first bipolar plate and second bipolar plate, first bipolar plate includes the base plate and sets up in first air inlet, first gas outlet, second air inlet, the second gas outlet at four corners of base plate, first air inlet, first gas outlet are diagonal setting, second air inlet, second gas outlet are diagonal setting, first air inlet, second air inlet set up in the same line, first gas outlet, second gas outlet set up in the same line, two-sided symmetry is provided with three-dimensional snakelike flow field on the base plate, the second bipolar plate for first bipolar plate upset 180 degrees sets up, first air inlet, the first gas outlet of first bipolar plate all communicate with the two-sided three-dimensional snakelike flow field of first bipolar plate, the second gas outlet of first bipolar plate corresponds the setting and is linked together with the two-sided three-dimensional flow field of second bipolar plate.
By adopting the technical scheme, after the first bipolar plate is positioned, the second bipolar plate with the same structure only needs to be turned over by 180 degrees from the front side to the back side to form a battery unit with the first bipolar plate and the first membrane electrode; a third bipolar plate (namely, another first bipolar plate on the other side of the second bipolar plate adjacent to the second bipolar plate, which is called as a third bipolar plate for convenience of description) with the same structure, the second bipolar plate and the second membrane electrode form a cell unit, and the like form a fuel cell stack, wherein the upper part of the structure is provided with a first air inlet and a second air inlet, and the lower part of the structure is provided with a first air outlet and a second air outlet, as shown in fig. 1, when oxygen is introduced into the first air inlet on the upper right of the first bipolar plate, both sides of the first bipolar plate form cathodes; the second gas inlet on the upper left of the first bipolar plate is communicated with the flow field of the first bipolar plate, so that the hydrogen cannot enter the flow field of the first bipolar plate, but the first gas inlet on the upper left of the second bipolar plate is communicated with the second gas inlet of the first bipolar plate, so that the hydrogen can enter the flow field of the second bipolar plate, and the second gas inlet on the upper right of the second bipolar plate is not communicated with the flow field of the second bipolar plate, so that the oxygen cannot enter the flow field of the second bipolar plate, and thus, an anode is formed on two sides of the second bipolar plate, and an electrochemical reaction area is formed by the cathode side of the first bipolar plate; the first gas inlet at the upper right of the third bipolar plate, the first gas inlet of the first bipolar plate and the second gas inlet at the upper right of the second bipolar plate are communicated, so oxygen can enter a flow field of the third bipolar plate, and a cathode and an anode of the second bipolar plate form an electrochemical reaction area on both sides of the third bipolar plate; the first air outlet and the second air outlet which are positioned below the polar plate form an air exhaust and water drainage channel, so that the whole volume of the cell stack is reduced, the number of electrochemical reaction areas under the same volume is increased, and the volume power density of the fuel cell is improved.
The invention further provides that: the two sides of the substrate are provided with positioning holes, and the positioning holes at the two sides are symmetrically arranged by taking the central line of the substrate between the first air inlet and the second air inlet as a symmetry axis.
By adopting the technical scheme, after the first bipolar plate is positioned, when the front side and the back side of the second bipolar plate with the same structure are turned over for 180 degrees, the positioning holes of the first bipolar plate and the second bipolar plate are consistent in position, so that the positioning is convenient, the fixation of the fuel cell stack formed by assembly is convenient, the bipolar plate is prevented from shifting in the working process to influence the service condition and the service life of the cell, and the stability is improved.
The invention also provides a double-sided three-dimensional serpentine flow field bipolar plate which comprises a substrate, wherein the two sides of the substrate are symmetrically provided with an integrally formed three-dimensional serpentine flow field, the three-dimensional serpentine flow field comprises a first air inlet, a first air outlet, serpentine gas channels and parallel ridges, the ridges are arranged in a hollow manner, a plurality of side holes communicated with adjacent gas channels are arranged on the upper side of each ridge at equal intervals, and the side holes are communicated with the inside of each ridge.
By adopting the technical scheme, the ridge is internally hollow, the space can realize the gas storage function, the space of the flow channel ridge is reasonably utilized, the contact area of the gas flow channel and the gas diffusion layer is enlarged, namely the aperture ratio of the flow field (the ratio of the area of the gas flow channel to the total area of the bipolar plate) is improved, more gas can participate in the work of the fuel cell, the problem of uneven gas distribution is relieved, and thus the mass transfer and the electric conduction characteristics are obviously enhanced; compared with the two-dimensional serpentine flow field in the prior art, because the number of the corners of the flow channel is large and long, the area of the flow field close to the reactant gas inlet can generate local heating, and the area of the flow field close to the reactant gas outlet can generate local accumulated water due to insufficient pressure drop, the battery can not work stably, and the efficiency is low.
The invention further sets up: ridge up end equidistance is provided with a plurality of top surface holes, top surface hole sets up with side hole is crisscross, the top surface hole sets up in the middle of the both sides face hole.
By adopting the technical scheme, the top surface of the ridge can be fully attached to the membrane electrode, the activation area of the polar plate is increased, and the contact resistance is reduced, so that the current density is improved; the top surface pores enable gas in the ridge to be directly diffused towards the membrane electrode, and the gas diffusion efficiency is improved.
The invention further provides that: the space between the adjacent side surface pores or the top surface pores is 2.5mm-3mm.
By adopting the technical scheme, the phenomenon that the ohmic polarization loss of the battery is increased due to overhigh aperture ratio or the reactant utilization rate is reduced due to overlow aperture ratio is avoided, the gas utilization rate and the battery power density are improved, and the performance of the battery is improved.
The invention further sets up: 10-18 side apertures are arranged on the single ridge, and the size of each side aperture is 0.18-0.42 mm.
By adopting the technical scheme, the number of the side holes can influence the gas distribution, so that the mass transfer and the electric conduction characteristics are obviously enhanced, and the performance of the battery is improved.
The invention further provides that: the single ridge is provided with 17 side holes, and the size of each side hole is 0.5 mm by 0.6mm.
By adopting the technical scheme, the opening size is preferably 0.5X 0.6, 17 through holes are arranged in each row, so that the through holes are set as the optimal parameters, and the current density can reach 1858mA/cm 2 Compared with the existing two-dimensional serpentine flow field, the current density is 1200mA/cm under the same condition 2 About, the performance of the battery of the technical scheme of the invention is improved by more than 50%.
The invention also provides a preparation method for preparing the double-sided three-dimensional serpentine flow field bipolar plate, which comprises the following steps of 1, constructing a model, adopting three-dimensional software to model the double-sided three-dimensional serpentine flow field to complete 3D modeling of the double-sided three-dimensional serpentine flow field, 2, carrying out entity layering treatment, and then guiding the solid layering treatment into a processing equipment system to wait for processing; step 3, preheating a forming platform of the forming chamber to 60-80 ℃, introducing inert atmosphere, detecting oxygen content, and setting the powder laying thickness of each layer; step 4, preparing the powder by adopting a layered rapid scanning method and a selective laser melting technology, wherein the processed laser power is 120W-200W, the laser scanning speed is 1000mm/s-1200mm/s, and the scanning interval is 0.05mm-0.1mm, so that the bipolar plate is prepared; step 5, carrying out solution annealing and age hardening heat treatment; step 6, chemically polishing; and 7, laser polishing.
By adopting the technical scheme and adopting the selective laser melting technology, the integrated rapid processing of the double-sided three-dimensional snake-shaped flow field and the matrix can be realized, the preparation efficiency is improved, the processing technology is simple, the processing precision is high, the processing quality is high, and the reliability is high; the preparation of the bipolar plate of the thin substrate and the bipolar plate of the thin runner wall is realized, and the volume ratio power of the battery is greatly increased; the density can reach nearly 100%, the size precision reaches 20-50 microns, the surface roughness reaches 20-30 microns, the quality precision is high, the forming cost is low, the process is simple, the material consumption is small, and the environment is protected; by adopting chemical polishing, the mechanical damage on the surface of the stainless steel can be removed, which is beneficial to preventing the local corrosion of the parts, improving the mechanical strength and prolonging the service life of the parts; after chemical polishing, the top surface of the ridge is finely polished by laser, the laser power is 80-120W, the diameter of a light spot is 20-30 μm, and the scanning speed is 400-500 mm/s, so that the effect of leveling the ridge can be achieved; the chemical polishing and laser polishing composite process is adopted for treatment, so that the contact resistance is reduced, and the gas and liquid fluidity is improved.
The invention further provides that: the step 5 comprises the following steps: step 51, heating the bipolar plate for 1 hour to 1050 ℃, and preserving heat for 20 minutes; step 52, cooling to 450 ℃ after 1 hour, and carrying out aging treatment for heat preservation for 1.5 hours; and step 53, air cooling to 20 ℃.
By adopting the technical scheme, the SLM process has the characteristic of rapid melting and solidification, so that a formed piece of the SLM process can generate a non-equilibrium structure, the performance of the bipolar plate can be influenced to different degrees along with the undesirable characteristics of coarse grains, high residual stress and the like, and the hardness and the strength of the bipolar plate can be improved and the residual stress can be reduced through the heat treatment of solution annealing and age hardening.
The invention further provides that: the step 6 comprises the following steps: step 61, preparing a mixed solution according to the proportion of 12 g/L ammonium bifluoride, 60 m L/L nitric acid, 110 m L/L phosphoric acid, 130 m L/L hydrochloric acid, 15 g/L sodium chloride and 60 m L/L hydrogen peroxide; step 62, heating the mixed solution to 55 ℃; step 63, putting the bipolar plate into the mixed solution, and soaking for 6-10 min; step 64, taking out the bipolar plate and washing the bipolar plate by clear water at the temperature of 45-55 ℃; step 65, cleaning the bipolar plate by using 3% -10% of alkali liquor; step 66, washing with clear water at 35-45 ℃; and 67, drying by a dryer.
Through adopting above-mentioned technical scheme, included porous structure, hollow out construction and used 316 stainless steel as the preparation material of bipolar plate in this patent design, so adopt chemical polishing after the preparation shaping, can get rid of the mechanical damage on stainless steel surface this is favorable to preventing the local corrosion of part, improves mechanical strength, extension part life.
The following describes embodiments of the present invention with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic three-dimensional structure of example 1 of the present invention;
FIG. 2 is a partial schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a sectional view of example 1 of the present invention;
fig. 4 is a schematic three-dimensional structure of a first bipolar plate according to embodiment 2 of the present invention; (ii) a
FIG. 5 is an enlarged view of portion A of FIG. 4;
FIG. 6 is a comparative plot of polarization curves for cells according to embodiments of the present invention;
reference numerals are as follows: 1. the three-dimensional flow field plate comprises a first bipolar plate, 11 a base plate, 12 a first air inlet, 13 a first air outlet, 14 a second air inlet, 15 a second air outlet, 16 a three-dimensional serpentine flow field, 161 a serpentine gas flow channel, 162 a ridge channel, 1621 a side pore, 1622 a top pore, 17 a positioning hole, 2 a membrane electrode and 3 a second bipolar plate.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Referring to fig. 1-6, the fuel cell adopting the double-sided three-dimensional serpentine flow field bipolar plate disclosed in the technical solution of the present invention includes a first bipolar plate 1, a second bipolar plate 3 having the same structure as the first bipolar plate 1, and a membrane electrode 2, wherein the second bipolar plate 3 is disposed between the two first bipolar plates 1, the membrane electrode 2 is disposed between the first bipolar plate 1 and the second bipolar plate 3, the first bipolar plate 1 includes a substrate 11, and a first gas inlet 12, a first gas outlet 13, a second gas inlet 14, and a second gas outlet 15 disposed at four corners of the substrate 11, the first gas inlet 12 and the first gas outlet 13 are diagonally disposed, the second gas inlet 14 and the second gas outlet 15 are diagonally disposed, the first gas inlet 12 and the second gas inlet 14 are disposed in the same row, the first gas outlet 13 and the second gas outlet 15 are disposed in the same row, two sides of the substrate 11 are symmetrically provided with a three-dimensional serpentine gas inlet 16, the second bipolar plate 3 is disposed by turning 180 degrees relative to the first bipolar plate 1, the first gas inlet 12, the first bipolar plate 13 and the first bipolar plate 1 are communicated with the second gas outlet 16 of the first bipolar plate 1, and the first bipolar plate 12 are communicated with the first bipolar plate 14.
The embodiment further provides that: the positioning holes 17 are formed in both sides of the substrate 11, and the positioning holes 17 are symmetrically formed on both sides of the substrate 11 by taking the center line of the substrate 11 between the first air inlet 12 and the second air inlet 14 as a symmetry axis.
The technical scheme of the invention also discloses a double-sided three-dimensional serpentine flow field bipolar plate which comprises a substrate 11, wherein the two sides of the substrate 11 are symmetrically provided with an integrally formed three-dimensional serpentine flow field 16, the three-dimensional serpentine flow field 16 comprises a first air inlet 12, a first air outlet 13, a serpentine gas flow channel 161 and a parallel ridge channel 162, the ridge channel 162 is arranged in a hollow manner, the upper side surface of the ridge channel 162 is equidistantly provided with a plurality of side surface pores 1621 communicated with adjacent gas flow channels, and the side surface pores 1621 are communicated with the interior of the ridge channel 162.
The embodiment further provides that: the ridge 162 upper end equidistance is provided with a plurality of top surface holes 1622, top surface hole 1622 and the crisscross setting of side hole 1621, top surface hole 1622 sets up in the middle of the both sides face hole 1621.
The embodiment further provides that: the spacing between adjacent side apertures 1621 or top apertures 1622 is 2.5mm to 3mm.
The embodiment further provides that: the single spine 162 is provided with 10-18 side apertures 1621, the side apertures 1621 being sized 0.18-0.42 mm.
The embodiment further provides that: the single ridge 162 is provided with 17 side apertures 1621, and the size of the side apertures 1621 is 0.5 mm by 0.6mm.
The technical scheme of the invention also discloses a preparation method for preparing the double-sided three-dimensional serpentine flow field bipolar plate, which comprises the following steps of 1, constructing a model, adopting three-dimensional software to model the double-sided three-dimensional serpentine flow field 16 to complete 3D modeling of the double-sided three-dimensional serpentine flow field 16, 2, carrying out entity layering treatment, and then introducing into a processing equipment system to wait for processing; step 3, preheating a forming platform of a forming chamber to 60-80 ℃, introducing inert atmosphere, detecting oxygen content, and setting the powder laying thickness of each layer; step 4, preparing the powder by adopting a layered rapid scanning method and a selective laser melting technology, wherein the processing laser power is 120W-200W, the laser scanning speed is 1000mm/s-1200mm/s, and the scanning interval is 0.05mm-0.1mm, so that the bipolar plate is prepared; step 5, carrying out solution annealing and age hardening heat treatment; step 6, chemical polishing; and 7, laser polishing.
The embodiment further provides that: the step 5 comprises the following steps: step 51, heating the bipolar plate for 1 hour to 1050 ℃, and preserving heat for 20 minutes; step 52, cooling to 450 ℃ after 1 hour, and carrying out aging treatment for heat preservation for 1.5 hours; and step 53, air cooling to 20 ℃.
The embodiment further provides that: the step 6 comprises the following steps: step 61, preparing a mixed solution according to the proportion of 12 g/L ammonium bifluoride, 60 m L/L nitric acid, 110 m L/L phosphoric acid, 130 m L/L hydrochloric acid, 15 g/L sodium chloride and 60 m L/L hydrogen peroxide; step 62, heating the mixed solution to 55 ℃; step 63, placing the bipolar plate into the mixed solution, and soaking for 6-10 min; step 64, taking out the bipolar plate and washing the bipolar plate by clean water at the temperature of 45-55 ℃; step 65, cleaning the bipolar plate by using 3% -10% of alkali liquor; step 66, washing with clear water at 35-45 ℃; and 67, drying by a dryer.
The above-mentioned "between" does not only mean between orientations and positions, but also means between the interactions of different parts.
Although used more herein: the terms of the first bipolar plate 1, the substrate 11, the first gas inlet 12, the first gas outlet 13, the second gas inlet 14, the second gas outlet 15, the three-dimensional serpentine flow field 16, the serpentine gas flow channel 161, the ridge channel 162, the side surface aperture 1621, the top surface aperture 1622, the positioning hole 17, the membrane electrode 2, and the second bipolar plate 3 are used, but the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A fuel cell adopting a double-sided three-dimensional snakelike flow field bipolar plate is characterized in that: contain first bipolar plate, second bipolar plate and membrane electrode the same with first bipolar plate structure, the second bipolar plate sets up between two first bipolar plates, the membrane electrode sets up between first bipolar plate and second bipolar plate, first bipolar plate includes the base plate and sets up in first air inlet, first gas outlet, second air inlet, the second gas outlet at four corners of base plate, first air inlet, first gas outlet are diagonal angle setting, second air inlet, second gas outlet are diagonal angle setting, first air inlet, second air inlet are the setting in the same line, first gas outlet, second gas outlet are the setting in the same line, bilateral symmetry is provided with three-dimensional snakelike flow field on the base plate, the second bipolar plate for first bipolar plate upset 180 degrees sets up, and first air inlet, the first gas outlet of first bipolar plate and the two-sided three-dimensional snakelike flow field of first bipolar plate all communicate, and the second gas outlet corresponds the setting and is linked together with the three-dimensional two-sided flow field of second bipolar plate, the first gas inlet, the first gas outlet of second bipolar plate.
2. A fuel cell employing a double-sided three-dimensional serpentine flow field bipolar plate as in claim 1, wherein: the two sides of the substrate are provided with positioning holes, and the positioning holes at the two sides are symmetrically arranged by taking the central line of the substrate between the first air inlet and the second air inlet as a symmetry axis.
3. A double-sided three-dimensional snakelike flow field bipolar plate is characterized in that: the solar cell panel comprises a substrate, the symmetry of base plate both sides is provided with integrated into one piece's three-dimensional snakelike flow field, three-dimensional snakelike flow field includes first air inlet, first gas outlet, snakelike gas flow way and parallel arrangement's spine, spine way cavity sets up, the side equidistance is provided with the side hole of the adjacent gas flow way of a plurality of intercommunications on the spine way, side hole and spine way inside are linked together.
4. A bipolar plate using a double-sided three-dimensional serpentine flow field according to claim 3, wherein: ridge up end equidistance is provided with a plurality of top surface holes, top surface hole sets up with side hole is crisscross, the top surface hole sets up in the middle of the both sides face hole.
5. The fuel cell of claim 4 employing a double-sided three-dimensional serpentine flow field bipolar plate, wherein: the space between the adjacent side surface pores or the top surface pores is 2.5mm-3mm.
6. A bipolar plate using a double-sided three-dimensional serpentine flow field according to claim 3, wherein: 10-18 side apertures are arranged on the single ridge, and the size of each side aperture is 0.18-0.42 mm.
7. A bipolar plate using a double-sided three-dimensional serpentine flow field according to claim 3, wherein: and 17 side pores are arranged on the single ridge, and the size of each side pore is 0.5 mm by 0.6mm.
8. A method of making a double-sided three-dimensional serpentine flow field bipolar plate according to any one of claims 1 to 7, wherein: the method comprises the following steps of 1, constructing a model, adopting three-dimensional software to model a double-sided three-dimensional serpentine flow field to complete 3D modeling of the double-sided three-dimensional serpentine flow field, and 2, carrying out entity layering treatment, and then guiding into a processing equipment system to wait for processing; step 3, preheating a forming platform of a forming chamber to 60-80 ℃, introducing inert atmosphere, detecting oxygen content, and setting the powder laying thickness of each layer; step 4, preparing the powder by adopting a layered rapid scanning method and a selective laser melting technology, wherein the processing laser power is 120W-200W, the laser scanning speed is 1000mm/s-1200mm/s, and the scanning interval is 0.05mm-0.1mm, so that the bipolar plate is prepared; step 5, solution annealing and age hardening heat treatment; step 6, chemical polishing; and 7, laser polishing.
9. The method of claim 8, wherein the step of preparing a bipolar plate comprises: the step 5 comprises the following steps: step 51, heating the bipolar plate for 1 hour to 1050 ℃, and preserving heat for 20 minutes; step 52, cooling to 450 ℃ after 1 hour, and carrying out aging treatment for heat preservation for 1.5 hours; and step 53, air cooling to 20 ℃.
10. The method of claim 8, wherein the step of preparing a bipolar plate comprises: the step 6 comprises the following steps: step 61, preparing a mixed solution according to the proportion of 12 g/L ammonium bifluoride, 60 m L/L nitric acid, 110 m L/L phosphoric acid, 130 m L/L hydrochloric acid, 15 g/L sodium chloride and 60 m L/L hydrogen peroxide; step 62, heating the mixed solution to 55 ℃; step 63, placing the bipolar plate into the mixed solution, and soaking for 6-10 min; step 64, taking out the bipolar plate and washing the bipolar plate by clean water at the temperature of 45-55 ℃; step 65, cleaning the bipolar plate by using 3% -10% of alkali liquor; step 66, washing with clear water at 35-45 ℃; and 67, drying by a dryer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211227529.8A CN115602871A (en) | 2022-10-09 | 2022-10-09 | Fuel cell, three-dimensional serpentine flow field bipolar plate and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211227529.8A CN115602871A (en) | 2022-10-09 | 2022-10-09 | Fuel cell, three-dimensional serpentine flow field bipolar plate and preparation method thereof |
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- 2022-10-09 CN CN202211227529.8A patent/CN115602871A/en active Pending
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