CN115275269A - Vein parallel flow field structure with gas distribution area and application of structure in fuel cell - Google Patents
Vein parallel flow field structure with gas distribution area and application of structure in fuel cell Download PDFInfo
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- CN115275269A CN115275269A CN202210945316.2A CN202210945316A CN115275269A CN 115275269 A CN115275269 A CN 115275269A CN 202210945316 A CN202210945316 A CN 202210945316A CN 115275269 A CN115275269 A CN 115275269A
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- 238000009826 distribution Methods 0.000 title claims abstract description 109
- 210000003462 vein Anatomy 0.000 title claims abstract description 24
- 239000000446 fuel Substances 0.000 title claims abstract description 13
- 230000009286 beneficial effect Effects 0.000 claims abstract description 4
- 239000006185 dispersion Substances 0.000 claims description 8
- 210000001367 artery Anatomy 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 95
- 238000013461 design Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 239000012495 reaction gas Substances 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 108091006146 Channels Proteins 0.000 description 67
- 239000012528 membrane Substances 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000011664 nicotinic acid Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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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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- 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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention provides a vein parallel flow field structure with a gas distribution area and application thereof in a fuel cell, belonging to the field of fuel cells. The gas distribution area is formed by arranging cylindrical ridges, and the arrangement angle of the gas distribution area is parallel to the edges of the distribution area; the central area is formed by interlacing a primary flow passage and a secondary flow passage; the primary flow channel is a parallel straight flow channel; the secondary flow channel is a branch flow channel inclined at a certain angle, and forms a vein structure with the primary direct flow channel to communicate all the primary flow channels. The reaction gas enters the flow field from the gas inlet and is distributed through the gas distribution area and the secondary flow channel for two times, so that the reaction gas is uniformly distributed in the flow field. The secondary distribution design of the invention is beneficial to the flow of water in the flow channel, effectively avoids the accumulation of water in the channel, avoids the occurrence of flooding phenomenon and can obviously improve the performance of the battery. In addition, the invention has simple structure, is easy to process and saves the manufacturing cost.
Description
Technical Field
The invention relates to a vein parallel flow field structure with a gas distribution area and application thereof in a fuel cell, belonging to the field of proton exchange membrane fuel cells.
Background
In recent years, although proton exchange membrane fuel cells have been developed rapidly, their large-scale commercial application still faces two technical challenges, cost and lifetime. The bipolar plate is used as an important component of the proton exchange membrane fuel cell, and the commercialization difficulty of the proton exchange membrane fuel cell can be greatly reduced due to the reasonable design of the flow field structure of the bipolar plate. On one hand, through reasonable flow field structure design, the processing difficulty of the bipolar plate is reduced, the post-processing procedure is simplified, the cost of the bipolar plate is further reduced, and the PEMFC cost problem is greatly solved; on the other hand, the optimization of the flow field structure and the improvement of the distribution condition in the single cell plane and the consistency of the galvanic pile are important ways for prolonging the service life of the galvanic pile.
The common flow fields comprise a dot flow field, a parallel flow field and a serpentine flow field, the serpentine flow field is widely applied, the single-channel design ensures that gas can only flow along the channel, the gas flow rate is high, the gas diffusion into the membrane electrode is facilitated, but the serpentine flow field has the problem of large pressure drop in the flow field, and once the serpentine flow field is flooded, the consequences are very serious. The parallel flow field has the advantages of relatively simple structure, easy processing, small pressure drop and the like, and has more uniform gas distribution compared with a punctiform flow field, so the parallel flow field has wider application prospect, but the parallel flow field also has the problem of easy flooding.
The bionic flow field mainly takes the structures of systems, individuals or organs and the like in the nature as inspiration, and applies the natural law in the bionic flow field to the design of the flow field. The leaf vein structure demonstrates to humans how to efficiently transport nutrients in a two-dimensional plane, and thus the vein structure is mimicked and used in pem fuel cell flow field design. Researches show that the vein-type flow field has more uniform gas distribution and water management conditions, but the bionic flow field generally has the problems of complex structure and high processing difficulty.
Disclosure of Invention
Based on the problems, the invention provides the vein parallel flow field structure with the gas distribution area, combines the advantages of the parallel flow field and the vein structure, simplifies the vein structure and enables the flow field to be processed more easily. The secondary distribution design of the invention is not only beneficial to the uniform distribution of gas, but also beneficial to the flow of water in the flow channel due to the design of the secondary flow channel, thereby effectively avoiding the accumulation of water in the flow channel and the occurrence of flooding phenomena, and remarkably improving the mass transfer performance and the service life of the fuel cell.
The invention provides a vein parallel flow field structure with a gas distribution area, which comprises: the gas inlet, the gas inlet distribution area, the central area, the gas outlet distribution area and the gas outlet are communicated in sequence;
the inlet gas distribution area and the outlet gas distribution area are trapezoidal in shape, cylindrical ridges favorable for gas dispersion are arranged in the inlet gas distribution area and the outlet gas distribution area, the cylindrical ridges are arranged in a staggered mode, and the arrangement angle of the cylindrical ridges is parallel to the edges of the inlet gas distribution area and the outlet gas distribution area;
the central area comprises a central area ridge, primary flow channels and secondary flow channels, the primary flow channels are arranged on two sides of the central area ridge and staggered with the secondary flow channels, and the secondary flow channels are symmetrically distributed on two sides of the primary flow channels to form a vein-shaped structure with the primary flow channels so as to communicate all the primary flow channels;
the central zone ridges are discontinuously distributed by secondary runner cuts.
The reaction gas enters the flow field from the gas inlet, uniformly enters the central area through the gas distribution of the gas inlet gas distribution area, is uniformly distributed in the central area through the redistribution of the secondary flow channels, and is discharged out of the flow field from the gas outlet through the gas distribution of the gas outlet gas distribution area.
Furthermore, the structure of the gas inlet distribution area is the same as that of the gas outlet distribution area, the gas inlet distribution area and the gas outlet distribution area are positioned on two sides of the central area, and the gas inlet and the gas outlet are arranged in a diagonal manner; the shape of the gas distribution area and the gas distribution area of giving vent to anger is trapezoidal, the base angle that the entry (gas inlet) was kept away from to the lower base in the gas distribution area that admits air is 10-45, and the two base angle sums of the gas distribution area lower base that admits air are 90, and the gas distribution area that admits air is with the inside cylindrical ridge staggered arrangement who is favorable to gas dispersion in the gas distribution area of giving vent to anger, and it arranges: the transverse rows are parallel to the bottom edge of the trapezoid, and the longitudinal rows are parallel to the short waist of the trapezoid;
further, the one-level runner of central zone is crisscross with the second grade runner, the one-level runner is parallel straight runner, the second grade runner is the rami artery runner of certain angle of slope, the rami artery runner is the straight runner, and the symmetric distribution forms the leaf vein branch structure in parallel straight runner both sides, with adjacent parallel runner intercommunication.
Furthermore, the central area ridge of the primary parallel straight flow channel is divided into parallelograms by the secondary flow channel, and the central area ridge close to the gas inlet distribution area and the gas outlet distribution area is trapezoidal.
Furthermore, the secondary flow channels are symmetrically or alternatively distributed on two sides of the primary flow channel to form a vein-shaped structure.
The invention preferably has the radius of the cylindrical ridges of 0.4-1.0mm and the height of 0.2-2mm, the circle centers of different cylindrical ridges have the distance of 1-2mm in the transverse direction and the distance of 1-2mm in the longitudinal direction.
The invention preferably has the width of the primary flow channel of 0.4-1.2mm and the depth of the flow channel of 0.2-2mm.
The width of the secondary flow channel is preferably 0.2-1.0mm, and the depth of the secondary flow channel is the same as that of the primary flow channel.
The distance between two adjacent secondary flow channels (two branches on the same side of the vein structure) is preferably 3-6mm.
The distance between the first branch of the secondary flow channel close to the gas distribution area and the distribution area is preferably 2-8mm.
The invention preferably selects that when the secondary flow passages are distributed in a staggered way, the distance between two branches on the same side is unchanged, and the branch structure on the other side is staggered by 1-3 mm.
The invention preferably has an included angle between the secondary flow channel and the primary flow channel of 15-75 degrees.
The preferred ridge width of the central region of the present invention is 0.4 to 1.5mm.
The invention is preferably such that the height of the cylindrical ridge of the gas distribution section is the same as the height of the ridge of the central section, and is in the range of 0.2 to 2mm.
The invention also relates to a method for protecting the vein parallel flow field structure with the gas distribution area, which can be used as a cathode and/or anode flow field and applied to the field of fuel cells.
The secondary flow channels can enable the gases in different primary flow channels to be communicated and gathered with each other, and finally flow in the whole flow field, so that the gases in the flow field are uniformly distributed in all the levels of flow channels, and dead zones caused by flooding in the flow channels are avoided; meanwhile, the secondary flow channels are distributed on two sides of the primary parallel flow channel, water accumulated in a certain parallel flow channel can be dispersed to an adjacent parallel flow channel in time, and flooding is avoided. In addition, the flow field structure of the invention inherits the advantages of a parallel flow field, and has the advantages of simple structure, small processing difficulty and low manufacturing cost.
Drawings
Figure 4 of the present invention;
FIG. 1 is a schematic view of example 1 of the present invention;
FIG. 2 is a schematic view of example 2 of the present invention;
FIG. 3 is a schematic diagram of the inclination angle of a branch;
fig. 4 is a graph of performance curves for inventive examples 1 and 2.
In the figure: 1-air inlet, 2-air inlet distribution area, 3-central area, 4-air outlet distribution area, 5-air outlet, 6-cylindrical ridge, 7-primary flow channel, 8-secondary flow channel and 9-central ridge.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
Example 1
As shown in fig. 1 and 3, a vein-parallel flow field structure with a gas distribution region comprises: the gas inlet 1, the gas inlet distribution area 2, the central area 3, the gas outlet distribution area 4 and the gas outlet 5 are communicated in sequence.
The inlet gas distribution area 2 and the outlet gas distribution area 4 have the same structure and are both trapezoidal, the inlet gas distribution area 2 and the outlet gas distribution area 4 are positioned at two sides of the central area 3, and the gas inlet 1 and the gas outlet 5 are arranged in a diagonal manner; the angle of a bottom angle of the lower bottom edge of the gas inlet distribution area 2 far away from the inlet is 20 degrees, and the sum of the two bottom angles of the lower bottom edge of the gas inlet distribution area 2 is 90 degrees; the cylindrical ridges 6 which are favorable for gas dispersion inside the inlet gas distribution area 2 and the outlet gas distribution area 4 are staggered and arranged as follows: the horizontal row is parallel with trapezoidal base, and the vertical row is parallel with trapezoidal short waist, 6 radiuses of cylindrical spine are 0.5mm, and highly are 1mm, and the distance is 2mm between every cylindrical spine centre of a circle is horizontal, and is 1.88mm between vertical.
The central area ridge 9 of the primary parallel straight flow channel is divided into parallelograms by the secondary flow channel 8, the central area ridge 9 close to the inlet gas distribution area 2 and the outlet gas distribution area 4 is trapezoidal, and the width of the central area ridge 9 is 1mm.
The performance curve of the embodiment tested under the conditions of 80 ℃, 0.15Mpa, 100% humidified hydrogen at the anode, 100% humidified air at the cathode, 3.6 of anode metering ratio, 4.0 of cathode metering ratio and parallel vein flow field at the cathode and anode flow fields is shown in figure 4. As can be seen from FIG. 4, the concentration of the compound is 1A/cm 2 The voltage of the embodiment can reach 0.6V, and the current density can reach 0.6W/cm 2 。
Example 2
As shown in fig. 2 and 3, a vein-parallel flow field structure with a gas distribution region comprises: the gas inlet 1, the gas inlet distribution area 2, the central area 3, the gas outlet distribution area 4 and the gas outlet 5 are communicated in sequence.
The inlet gas distribution area 2 and the outlet gas distribution area 4 have the same structure and are both trapezoidal, the inlet gas distribution area 2 and the outlet gas distribution area 4 are positioned on two sides of the central area 3, and the gas inlet 1 and the gas outlet 5 are arranged in a diagonal manner; the angle of the bottom angle of the lower bottom edge of the gas inlet distribution area 2 far away from the inlet is 20 degrees, the sum of the two bottom angles of the lower bottom edge of the gas inlet distribution area 2 is 90 degrees, and the cylindrical ridges 6 which are favorable for gas dispersion in the gas inlet distribution area 2 and the gas outlet distribution area 4 are staggered and arranged as follows: the horizontal row is parallel with trapezoidal base, and the vertical row is parallel with trapezoidal short waist, 6 radiuses of cylindrical spine are 0.5mm, and highly are 1mm, and 6 centre of a circle of each cylindrical spine are apart from 2mm between horizontal, and are apart from 1.88mm between vertical.
The central area 3 comprises a central area ridge 9, a primary flow channel 7 and a secondary flow channel 8, the primary flow channel 7 is arranged on two sides of the central area ridge 9, the primary flow channel 7 is staggered with the secondary flow channel 8, the primary flow channel 7 is a parallel straight flow channel, the secondary flow channel 8 is a branch flow channel inclined by 60 degrees, the branch flow channel is a straight flow channel, the branch flow channels are distributed on two sides of the parallel straight flow channel in a staggered mode to form a vein branch structure, adjacent parallel flow channels are communicated, and the distance between the secondary flow channels 8 on two sides of the parallel flow channel in a staggered mode is 3mm; the width of the first-stage flow channel 7 of the central area 3 is 1mm, and the depth of the flow channel is 1mm; the width of the secondary flow channel 8 is 1mm, and the depth of the secondary flow channel is the same as that of the primary flow channel 7; the distance between the center of the first branch of the secondary flow channel 8 close to the gas distribution area and the gas inlet distribution area 2 and the gas outlet distribution area 4 is 4mm; the distance between the two branches on the same side of the vein structure is 6mm.
The central area ridge 9 of the primary parallel straight flow channel is divided into parallelograms by the secondary flow channel 8, the central ridge 9 close to the inlet gas distribution area 2 and the outlet gas distribution area 4 is trapezoidal, and the width of the central area ridge 9 is 1mm.
The performance curve of the embodiment tested under the conditions of 80 ℃, 0.15Mpa, 100% humidified hydrogen at the anode, 100% humidified air at the cathode, 3.6 of the anode metering ratio, 4.0 of the cathode metering ratio and the anode flow field being the vein parallel flow field is shown in fig. 4. As can be seen from FIG. 4, in1A/cm 2 The voltage of the embodiment can reach 0.6V, and the current density can reach 0.6W/cm 2 。
Claims (9)
1. The utility model provides a parallel flow field structure of vein with gas distribution district which characterized in that: the flow field structure comprises a gas inlet (1), a gas inlet distribution area (2), a central area (3), a gas outlet distribution area (4) and a gas outlet (5) which are communicated in sequence;
the inlet gas distribution area (2) and the outlet gas distribution area (4) are trapezoidal in shape, cylindrical ridges (6) which are beneficial to gas dispersion are arranged inside the inlet gas distribution area and the outlet gas distribution area, and the cylindrical ridges (6) are arranged in a staggered mode;
the central area (3) comprises a central area ridge (9), primary flow channels (7) and secondary flow channels (8), the primary flow channels (7) are arranged on two sides of the central area ridge (9), the primary flow channels (7) and the secondary flow channels (8) are staggered, and the secondary flow channels (8) are symmetrically distributed on two sides of the primary flow channels (7) to form a vein-shaped structure;
the central area ridge (9) is cut by the secondary flow channel (8) and is distributed discontinuously.
2. The lobed parallel flow field structure with gas distribution lands of claim 1, wherein: the structure of the gas inlet distribution area (2) is the same as that of the gas outlet distribution area (4), the gas inlet distribution area (2) and the gas outlet distribution area (4) are positioned on two sides of the central area (3), and the gas inlet (1) and the gas outlet (5) are arranged diagonally; the angle of a bottom angle of the lower bottom edge of the intake gas distribution area (2) far away from the inlet is 10-45 degrees, and the sum of two bottom angles of the lower bottom edge of the intake gas distribution area (2) is 90 degrees.
3. The lobed parallel flow field structure with a gas distribution region of claim 1, wherein: the cylindrical ridges (6) in the gas inlet distribution area (2) and the gas outlet distribution area (4) are used as gas dispersion columns, the horizontal rows of the gas dispersion columns are parallel to the bottom edge of the trapezoid, the vertical rows of the gas dispersion columns are parallel to the short waist of the trapezoid, the radius of the cylindrical ridges (6) is 0.4-1.0mm, the height of the cylindrical ridges (6) is 0.2-2mm, the distance between the horizontal circles of the circle centers of different cylindrical ridges (6) is 1-2mm, and the distance between the vertical circles of different cylindrical ridges (6) is 1-2mm.
4. The lobed parallel flow field structure with gas distribution lands of claim 1, wherein: the primary flow channel (7) of the central area (3) is a parallel straight flow channel, the width of the primary flow channel (7) is 0.4-1.2mm, the depth of the primary flow channel (7) is 0.2-2mm, and the height of the primary flow channel is the same as that of the cylindrical ridge (6).
5. The lobed parallel flow field structure with a gas distribution region of claim 1, wherein: the artery runner of certain angle of slope is in second grade runner (8) of central zone (3), artery runner symmetric distribution or crisscross distribution form vein branch structure in one-level runner (7) both sides, with adjacent one-level runner (7) intercommunication, the width of second grade runner (8) is 0.2-1mm, and its degree of depth is the same with one-level runner (7), first artery and distribution district distance that second grade runner (8) are close to gas distribution district (2) are 2-8mm, the vein structure is 3-6mm with the same side between two arteries, the contained angle between second grade runner (8) and one-level runner (7) is 15-75.
6. The lobed parallel flow field structure with gas distribution lands of claim 5, wherein: when the secondary flow passages (8) are distributed in a staggered way, the distance between the two branches on the same side is unchanged, and the branches on the other side are staggered by 1-3 mm.
7. The lobed parallel flow field structure with gas distribution lands of claim 1, wherein: the central area ridge (9) of the primary flow channel (7) is divided into parallelograms by the secondary flow channel (8), the central area ridge (9) close to the gas inlet distribution area (2) and the gas outlet distribution area (4) is trapezoidal, the width of the central area ridge (9) is 0.4-1.5mm, and the height of the central area ridge (9) is the same as the height of the cylindrical ridge (6) in the gas inlet distribution area (2) and the gas outlet distribution area (4).
8. The application of the vein parallel flow field structure with the gas distribution area, which is described in the claim 1, in the field of fuel cells.
9. The use according to claim 8, said lobed parallel flow field configuration with gas distribution regions being used as a cathode and/or anode flow field.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115881997A (en) * | 2022-12-19 | 2023-03-31 | 安徽明天新能源科技有限公司 | Fuel cell bipolar plate with novel flow field and preparation method thereof |
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| CN111509256A (en) * | 2020-06-10 | 2020-08-07 | 温州大学 | Flow field of fork-shaped leaf vein-shaped interdigitated proton exchange membrane fuel cell bipolar plate |
| CN113193207A (en) * | 2021-04-29 | 2021-07-30 | 天津大学 | Parallel partition staggered proton exchange membrane fuel cell cathode flow field plate |
| CN113299941A (en) * | 2021-06-04 | 2021-08-24 | 大连海事大学 | Double polar plate of proton exchange film fuel cell with parallelogram combined baffle |
| CN113314726A (en) * | 2021-06-04 | 2021-08-27 | 大连海事大学 | Arrow-feather-shaped bipolar plate of proton exchange membrane fuel cell |
| CN113410487A (en) * | 2021-06-17 | 2021-09-17 | 深圳润世华研发科技有限公司 | Mixed type fuel cell bipolar plate flow channel structure with three ports distributed at same side |
| CN113571727A (en) * | 2021-07-20 | 2021-10-29 | 大连海事大学 | Novel bipolar plate with wave-shaped structure and under-ridge flow channel coupling proton exchange membrane fuel cell |
| CN114267848A (en) * | 2021-12-24 | 2022-04-01 | 吉林大学 | Fuel cell bipolar plate of bionic multistage bifurcated flow field and implementation method thereof |
| CN114464835A (en) * | 2022-02-23 | 2022-05-10 | 一汽解放汽车有限公司 | Water drop-shaped bipolar plate and application thereof |
| CN114583202A (en) * | 2022-04-29 | 2022-06-03 | 北京新研创能科技有限公司 | Fuel cell polar plate and fuel cell stack |
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| CN115881997A (en) * | 2022-12-19 | 2023-03-31 | 安徽明天新能源科技有限公司 | Fuel cell bipolar plate with novel flow field and preparation method thereof |
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