CN113571727A - Novel bipolar plate with wave-shaped structure and under-ridge flow channel coupling proton exchange membrane fuel cell - Google Patents
Novel bipolar plate with wave-shaped structure and under-ridge flow channel coupling proton exchange membrane fuel cell Download PDFInfo
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- CN113571727A CN113571727A CN202110821199.4A CN202110821199A CN113571727A CN 113571727 A CN113571727 A CN 113571727A CN 202110821199 A CN202110821199 A CN 202110821199A CN 113571727 A CN113571727 A CN 113571727A
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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
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention discloses a novel bipolar plate with a corrugated structure and an under-ridge runner coupling proton exchange membrane fuel cell, which comprises: the device comprises a periodic corrugated structure, an under-ridge structure, an inlet and an outlet, a gas dispersion column, a bipolar plate body and a diffusion groove; the bipolar plate body is provided with a diffusion groove; the two ends of the diffusion groove are provided with the inlet and the outlet; the gas dispersion column is positioned at the inner side of the inlet and the outlet, a plurality of rows of periodic corrugation structures are arranged in parallel from the gas dispersion column at one end to the gas dispersion column at the other end in the diffusion groove, and an under-ridge structure is arranged between any two rows of periodic corrugation structures. The invention can not only obviously improve the shunting effect of the parallel flow field, but also improve the material transmission in the proton exchange membrane fuel cell. Compared with the traditional parallel flow channel, the concentration of reactants under the ridge is obviously increased, the concentration of products is obviously reduced, and the distribution of substances, temperature and current density is more uniform. Effectively reduces concentration polarization and improves the overall performance of the proton exchange membrane fuel cell.
Description
Technical Field
The invention relates to the field of proton exchange membrane fuel cells, in particular to a novel bipolar plate with a corrugated structure and a ridge lower flow channel coupling proton exchange membrane fuel cell.
Background
In the proton exchange membrane fuel cell flow field structure, there are mainly the structure of the whole form of the convection field and the method of reducing the flow channel volume by adding the block and the structure ripple flow channel structure.
The structure of the whole flow field mainly has a serpentine flow field, an interdigital flow field, a parallel flow field and the like. The novel flow fields of snake shape, interdigital shape and the like can promote the material transmission in the proton exchange membrane fuel cell, but the main defects of the proton exchange membrane fuel cell are that the pressure drop is large and the processing is complex. The parallel flow field has small pressure drop and easy processing, and is the most applied flow field form at present. By adding a block, on the one hand the reaction gas is forced into the diffusion layer and on the other hand the discharge of the produced water is also facilitated. This will improve the mass transport capacity, reduce the effects of concentration polarization, and improve proton exchange membrane fuel cell performance. However, this method causes a large pressure drop difference, resulting in additional energy consumption.
The corrugated flow field has a wavy structure with a periodical structure, and can also generate forced convection to promote the transportation of substances in the proton exchange membrane fuel cell so as to improve the performance of the proton exchange membrane fuel cell, and compared with a method for increasing a block, the pressure drop difference caused by the method is smaller. However, the addition of the blocking block and the corrugated flow channel structure only allows more gas to enter the diffusion layer from the flow channel, and the material transmission characteristics in the diffusion layer under the flow channel and the diffusion layer under the ridge are different. Reaction gas in the lower ridge part is difficult to enter and generated water is difficult to discharge.
Disclosure of Invention
The invention provides a novel bipolar plate with a wavy structure and a ridge lower runner coupling proton exchange membrane fuel cell, which aims to solve the problems.
The invention comprises the following steps: the device comprises a periodic corrugated structure, an under-ridge structure, an inlet and an outlet, a gas dispersion column, a bipolar plate body and a diffusion groove; the bipolar plate body is provided with a diffusion groove; the two ends of the diffusion groove are provided with an inlet and an outlet; the gas dispersion column is positioned at the inner side of the inlet and the outlet, a plurality of rows of periodic corrugation structures are arranged in parallel from the gas dispersion column at one end to the gas dispersion column at the other end in the diffusion groove, and the under-ridge structure is arranged between any two rows of periodic corrugation structures.
Furthermore, the periodic corrugated structure is a strip-shaped structure with a plurality of repeated corrugated structures on the surface, the length of the periodic corrugated structure is 1mm-5mm, the width of the periodic corrugated structure is 0.8mm, the height of a flow channel is 0.1mm-0.8mm, and the number of the waves is 4-18; one end of the periodic corrugated structure close to the inlet and outlet is 2mm away from the inlet and outlet.
Furthermore, the under-ridge structure is composed of 4-18 repeated under-ridge units, the under-ridge units are located right below the lowest position of the wave of the adjacent straight flow channel, the under-ridge units are in a cross connection structure located at the bottom of the flow channel, the length of the under-ridge units is 1mm-5mm, the width of the under-ridge units is 0.1mm-0.2mm, the height of the under-ridge units is 0.1mm-0.2mm, and the under-ridge units are communicated with the wave bottom end of the periodic wave-shaped structure.
Furthermore, the length of the entrance and the exit is 1-3mm, the width is 1-3mm, and the height is 1-1.6 mm; the inner side of the inlet and the outlet is provided with a plurality of rows of gas dispersion columns, the centers of the gas dispersion columns close to one side of the periodic corrugated structure are aligned with the periodic corrugated structure, the radius of the gas dispersion columns is 0.6-0.8 mm, the height of the gas dispersion columns is 0.4-0.8mm, the distance between the circle centers of the gas dispersion columns in the transverse direction is 1-2mm, and the distance between the circle centers in the longitudinal direction is 0.5-1.5 mm.
Furthermore, the length of the bipolar plate body is 30mm-40mm, the width is 20-30mm, and the height is 1.6 mm. The invention can not only obviously improve the shunting effect of the parallel flow field, but also improve the material transmission in the proton exchange membrane fuel cell. Compared with the traditional parallel flow channel, the concentration of reactants under the ridge is obviously increased, the concentration of products is obviously reduced, and the distribution of substances, temperature and current density is more uniform. Effectively reduces concentration polarization and improves the overall performance of the proton exchange membrane fuel cell.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an overall structural view of the present invention;
FIG. 2 is a comparative experimental diagram of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is an enlarged view of a periodic corrugation structure of the present invention;
FIG. 5 is an enlarged view of the under-ridge structure of the present invention;
FIG. 6 is an enlarged view of the gas dispersion column of the present invention.
The reference numbers illustrate:
1. a periodic corrugated structure; 2. a sub-ridge structure; 3. an entrance and an exit; 4. a gas dispersion column; 6. a bipolar plate body; 7. a diffusion groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and 3:
the invention comprises the following steps: the device comprises a periodic corrugated structure 1, an under-ridge structure 2, an inlet and an outlet 3, a gas dispersion column 4, a bipolar plate body 5 and a diffusion groove 6; the bipolar plate body 5 is provided with a diffusion groove 6; the inlet and outlet 3 is arranged at the two ends of the diffusion groove; the gas dispersion column 4 is positioned on the inner side of the inlet and outlet 3, a plurality of rows of periodic corrugated structures 1 are arranged in parallel from one end to the other end of the diffusion groove 6, and the under-ridge structure 2 is positioned between any two rows of periodic corrugated structures 1.
As shown in fig. 4, the periodic corrugated structure 1 is a strip-shaped structure with a plurality of repeated waves on the surface, the length of the periodic corrugated structure 1 is 1mm-5mm, the width is 0.8mm, the height of the flow channel is 0.1mm-0.8mm, and the number of the waves is 4-18; the distance between the periodic corrugated structure 1 and an inlet and an outlet of the runner is 2mm, and the periodic corrugated structure 1 is a straight runner.
Specifically, the periodic corrugated structure causes the velocity vector of the gas to periodically change during the movement process, which generates a forced convection effect and enhances the substance exchange between the flow channel and the diffusion layer.
As shown in fig. 5, a plurality of rows of under-ridge structures 2 are arranged between any two rows of the periodic corrugated structures 1, each row of under-ridge structure 2 is composed of 4-18 repeated under-ridge units, the repeated under-ridge units are located right below the lowest position of the adjacent straight-channel waves, the bottoms of the repeated under-ridge unit flow channels are in a cross connection structure, the length of the repeated under-ridge units is 1mm-5mm, the width of the repeated under-ridge units is 0.1mm-0.2mm, the height of the repeated under-ridge units is 0.1mm-0.2mm, the repeated under-ridge units are communicated with the lowest ends of the waves of the periodic corrugated structures 1, and the distances from the inlet and the outlet of the flow channels are respectively 2 mm.
In particular, the under-ridge channels may enhance mass transport between the under-ridge diffusion layer and the under-channel diffusion layer.
As shown in FIG. 6, the length of the entrance 3 is 1-3mm, the width is 1-3mm, and the height is 1-1.6 mm; the inner side of the inlet and outlet 3 is provided with a plurality of rows of gas dispersion columns 4, the centers of the gas dispersion columns 4 close to one side of the periodic corrugated structure 1 are aligned with the periodic corrugated structure 1, the radius is 0.6mm-0.8mm, the height is 0.4-0.8mm, the distance between the circle centers of each gas dispersion column 4 in the transverse direction is 1-2mm, and the distance between the circle centers in the longitudinal direction is 0.5mm-1.5 mm; the number of the gas dispersion columns 4 is 13, 10, 7 and 4 from the inlet direction.
The length of the bipolar plate body 5 is 30mm-40mm, the width is 20-30mm, and the height is 1.6 mm.
Example 2
During operation of the pem fuel cell, gas enters the flow channels through the inlet. The gas flows through the diffusion area and then flows to the next flow channel area uniformly. In the area of the flow channel, the wave structure with the periodically arranged structure can generate a velocity component vertical to the direction of the flow channel, and generate and forcibly strengthen the exchange of substances in the flow channel and a diffusion layer below the flow channel. Second, the under-ridge channels between the channels also enhance the mass exchange between the under-ridge diffusion layer and the under-channel diffusion layer.
As shown in FIG. 2, the current density of the novel flow channel is improved by 4% under the voltage of 0.4V, and the concentration polarization loss under high current density is effectively relieved.
The whole beneficial effects are as follows:
the invention can not only obviously improve the shunting effect of the parallel flow field, but also improve the material transmission in the proton exchange membrane fuel cell. Compared with the traditional parallel flow channel, the concentration of reactants under the ridge is obviously increased, the concentration of products is obviously reduced, and the distribution of substances, temperature and current density is more uniform. Effectively reduces concentration polarization and improves the overall performance of the proton exchange membrane fuel cell.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A novel bipolar plate with a corrugated structure and an under-ridge runner coupling proton exchange membrane fuel cell is characterized by comprising: the device comprises a periodic corrugated structure (1), a ridge lower structure (2), an inlet and an outlet (3), a gas dispersion column (4), a bipolar plate body (5) and a diffusion groove (6);
the bipolar plate body (5) is provided with the diffusion groove (6); the two ends of the diffusion groove are provided with the inlet and the outlet (3); the gas dispersion column (4) is located on the inner side of the access (3), a plurality of rows of periodic corrugated structures (1) are arranged in the diffusion groove (6) from one end of the gas dispersion column (4) to the other end of the gas dispersion column (4) in parallel, and the ridge lower structure (2) is arranged between any two rows of periodic corrugated structures (1).
2. The novel fuel cell bipolar plate flow field structure of claim 1, wherein the periodic corrugated structure (1) is a strip-shaped structure with a plurality of repeated corrugations on the surface, the length of the periodic corrugated structure (1) is 1mm-5mm, the width is 0.8mm, the height of the flow channel is 0.1mm-0.8mm, and the number of the corrugations is 4-18; one end of the periodic corrugated structure (1) close to the entrance (3) is 2mm away from the entrance (3).
3. The novel fuel cell bipolar plate flow field structure of claim 1, wherein said under-ridge structure (2) is composed of 4-18 repeated under-ridge units, said under-ridge units are located right below the lowest part of the wave of the adjacent straight flow channel, said under-ridge units are cross-connected structure located at the bottom of the flow channel, said under-ridge units have length of 1mm-5mm, width of 0.1mm-0.2mm and height of 0.1mm-0.2mm, said under-ridge units are connected with the lowest end of the wave of said periodic corrugated structure (1).
4. The novel fuel cell bipolar plate flow field structure as claimed in claim 1, wherein the inlet and outlet (3) dimensions are 1-3mm long, 1-3mm wide and 1-1.6mm high; the inner side of the inlet and outlet (3) is provided with a plurality of rows of gas dispersion columns (4), the centers of the gas dispersion columns (4) close to one side of the periodic corrugated structure (1) are aligned with the periodic corrugated structure (1), the radius of each gas dispersion column (4) is 0.6-0.8 mm, the height of each gas dispersion column is 0.4-0.8mm, the distance between the circle centers of each gas dispersion column (4) in the transverse direction is 1-2mm, and the distance between the circle centers in the longitudinal direction is 0.5-1.5 mm.
5. The novel fuel cell bipolar plate flow field structure as claimed in claim 1, wherein said bipolar plate body (5) has a length of 30mm-40mm, a width of 20-30mm and a height of 1.6 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110821199.4A CN113571727B (en) | 2021-07-20 | 2021-07-20 | Flow field structure of bipolar plate of fuel cell |
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| CN202110821199.4A CN113571727B (en) | 2021-07-20 | 2021-07-20 | Flow field structure of bipolar plate of fuel cell |
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| CN113571727B CN113571727B (en) | 2022-06-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115275269A (en) * | 2022-08-08 | 2022-11-01 | 大连理工大学 | Vein parallel flow field structure with gas distribution area and application of structure in fuel cell |
| CN116666681A (en) * | 2023-07-28 | 2023-08-29 | 山东美燃氢动力有限公司 | Bipolar plate of normal pressure fuel cell stack |
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| CN112909283A (en) * | 2021-03-22 | 2021-06-04 | 苏州弗尔赛能源科技股份有限公司 | Proton exchange membrane fuel cell bipolar plate |
| DE102019220534A1 (en) * | 2019-12-23 | 2021-06-24 | Robert Bosch Gmbh | Electrochemical cell with a distribution plate |
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2021
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| CN108963297A (en) * | 2018-06-29 | 2018-12-07 | 上海交通大学 | The waveform flow channels for proton exchange membrane fuel cells of convection current under a kind of reinforcing ridge |
| CN110993985A (en) * | 2019-12-14 | 2020-04-10 | 中国科学院大连化学物理研究所 | Flow channel structure of metal bipolar plate flow field of fuel cell |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115275269A (en) * | 2022-08-08 | 2022-11-01 | 大连理工大学 | Vein parallel flow field structure with gas distribution area and application of structure in fuel cell |
| CN116666681A (en) * | 2023-07-28 | 2023-08-29 | 山东美燃氢动力有限公司 | Bipolar plate of normal pressure fuel cell stack |
| CN116666681B (en) * | 2023-07-28 | 2023-12-08 | 山东美燃氢动力有限公司 | Bipolar plate of normal pressure fuel cell stack |
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