CN112993303B - Corrugated flow field structure - Google Patents
Corrugated flow field structure Download PDFInfo
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- CN112993303B CN112993303B CN201911287491.1A CN201911287491A CN112993303B CN 112993303 B CN112993303 B CN 112993303B CN 201911287491 A CN201911287491 A CN 201911287491A CN 112993303 B CN112993303 B CN 112993303B
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- arc surface
- convex arc
- field structure
- flow field
- flow
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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
- H01M8/0265—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
Abstract
The invention relates to a corrugated flow field structure, and belongs to the field of fuel cells. The central area of the flow field structure is formed by a plurality of primary flow channels and a plurality of secondary flow channels alternately; the primary flow channel is formed by a plurality of same concave arc surfaces and a plurality of same convex arc surfaces I in an alternating mode; the secondary flow channel is formed by a plurality of same convex arc surfaces II and a plurality of same planes in an alternating mode. The invention designs a novel corrugated flow field structure which is provided with a periodically-changed flow channel, so that the turbulence degree of gas in a battery is increased, the performance of the battery is improved, and the effect is more obvious particularly under high current density.
Description
Technical Field
The invention relates to a corrugated flow field structure, and belongs to the field of fuel cells.
Background
As the demand for energy rises and environmental problems become more prominent, the disadvantages of conventional energy conversion devices, such as internal combustion engines, are gradually magnified, and people around the world have increasingly high calls for new energy. The fuel cell, especially the proton exchange membrane fuel cell, has the advantages of zero emission, high efficiency, mild working conditions and the like, is unique in new energy resources, and becomes a research hotspot in recent years. However, large-scale commercialization of fuel cells is currently plagued by a range of technical problems, with cost being one of the most significant problems, in addition to the hydrogen source. The solution of the cost problem, on the one hand, requires improvement of the materials, for example, the use of non-platinum catalysts or reduction of the cost of the materials or parts processing; on the other hand, the performance of the battery is improved. Current membrane electrode technology has advanced to a higher level and it is becoming more and more difficult to improve cell performance with a constant share. Compared with the improvement of membrane electrode technology, the improvement effect of flow field design on the cell performance is obvious.
Conventional flow fields for fuel cells include parallel groove flow fields, serpentine flow fields, dotted flow fields, and interdigitated flow fields. The flow fields have the advantages of simple processing and suitability for large-scale production. However, mass transfer power of these flow fields is single molecular diffusion, and the cell easily faces the problems of lack of raw material gas and incapability of discharging product water under large flow density, so that it is necessary to develop a flow field with better mass transfer effect.
Since the second generation of Toyota fuel cell vehicles Mirai came into existence, the heat in three-dimensional flow fields has been increasing. Compared with the traditional two-dimensional flow field, the three-dimensional flow field has the velocity component vertical to the membrane electrode, so that the capability of the cell for transferring gas to the membrane electrode and discharging product water out of the cell can be improved, and the performance of the cell is further improved. This effect is particularly pronounced at high current densities. However, the three-dimensional flow field of the toyota is very complex, has high requirements for raw materials and processing, has high cost, and is not necessarily suitable for large-scale application of the fuel cell, so that the development of a more efficient and simpler three-dimensional flow field is required to adapt to large-scale commercialization of the fuel cell.
Disclosure of Invention
The invention designs a novel corrugated flow field structure which is provided with a periodically-changed flow channel, so that the turbulence degree of gas in a battery is increased, the performance of the battery is improved, and the effect is more obvious particularly under high current density.
The invention provides a corrugated flow field structure, wherein the central area of the flow field structure is formed by a plurality of primary flow channels and a plurality of secondary flow channels alternately; the primary flow channel is formed by a plurality of same concave arc surfaces and a plurality of same convex arc surfaces I in an alternating mode; the secondary flow channel is formed by a plurality of same convex arc surfaces II and a plurality of same planes in an alternating mode.
The primary flow channel is a main flow channel of gas and is also a main discharge channel of product water; the secondary flow channel not only has the function of a conventional flow field ridge, but also can communicate different flow channels, so that gas can flow in the range of the full battery
The invention preferably arranges the primary flow channel and the secondary flow channel in parallel.
The radius of the concave arc surface is preferably equal to the radius of the convex arc surface I, and the radius of the concave arc surface is 2-2.5mm.
The height of the concave arc surface is preferably equal to that of the convex arc surface I.
The radius of the convex arc surface II is preferably 2mm.
The height of the convex arc surface II is preferably 0.4-0.6mm.
The length of the concave arc surface is preferably equal to that of the convex arc surface II.
The length of the convex arc surface I is preferably equal to that of the plane.
The concave arc surface is preferably adjacent to the convex arc surface II.
The invention preferably selects the convex arc surface I to be adjacent to the plane.
The invention has the beneficial effects that:
the invention can control the turbulence degree of the gas in the primary flow passage by adjusting the radius of the circular arc surface of the primary flow passage;
the secondary flow channel is a flow channel between adjacent primary flow channels, and the secondary flow channel can enable gas between different primary flow channels to be communicated, so that gas in the battery can flow freely;
the invention can control the turbulence degree of the gas in the battery by adjusting the radius and the height of the arc surface of the secondary flow channel, thereby regulating and controlling the performance of the battery.
Drawings
In the figure 3 of the attached drawings of the invention,
FIG. 1 is a schematic structural view of a corrugated flow field structure according to the present invention;
FIG. 2 is an elevational view of a corrugated flow field structure according to the present invention;
FIG. 3 is a graph of I-V curves for the batteries of examples 1-3;
wherein: 1. inlet manifold, 2, outlet manifold, 3, plane, 4, convex arc face II, 5, convex arc face I, 6, concave arc face.
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
A corrugated flow field structure comprising a plurality of inlet manifolds 1, a plurality of outlet manifolds 2 and a central region between the inlet manifolds 1 and the outlet manifolds 2;
the central area is formed by a plurality of primary flow channels and a plurality of secondary flow channels in an alternating mode, and the primary flow channels and the secondary flow channels are arranged in parallel;
the primary flow channel is formed by alternately forming a plurality of same concave arc surfaces 6 and a plurality of same convex arc surfaces I5, the radius of each concave arc surface 6 is 2mm, the radius of each convex arc surface I5 is equal to that of each concave arc surface 6, and the height of each convex arc surface I5 is equal to that of each concave arc surface 6;
the secondary flow channel is formed by a plurality of identical convex arc surfaces II 4 and a plurality of identical planes 3 in an alternating mode, the radius of each convex arc surface II 4 is 2mm, and the height of each convex arc surface II 4 is 0.6mm;
the concave arc surface 6 is adjacent to the convex arc surface II 4, and the length of the concave arc surface 6 is equal to that of the convex arc surface II 4;
the convex arc surface I5 is adjacent to the plane 3, and the length of the convex arc surface I5 is equal to that of the plane 3;
a plurality of inlet manifolds 1 are arranged in parallel, and the inlet manifolds 1 are communicated with primary flow channels;
a plurality of the outlet manifolds 2 are arranged in parallel, and the outlet manifolds 2 communicate with the primary flow channels.
The polarization curve of this example tested under conditions of 0.1MPa, 80 deg.C, 100% humidification at anode, 50% humidification at cathode, 1.5 stoichiometric ratio at anode, and 2.5 stoichiometric ratio at cathode is shown in FIG. 3.
Example 2
A corrugated flow field structure comprising a plurality of inlet manifolds 1, a plurality of outlet manifolds 2 and a central region between the inlet manifolds 1 and the outlet manifolds 2;
the central area is formed by a plurality of primary runners and a plurality of secondary runners in an alternating mode, and the primary runners and the secondary runners are arranged in parallel;
the primary flow channel is formed by alternately forming a plurality of same concave arc surfaces 6 and a plurality of same convex arc surfaces I5, the radius of each concave arc surface 6 is 2mm, the radius of each convex arc surface I5 is equal to that of each concave arc surface 6, and the height of each convex arc surface I5 is equal to that of each concave arc surface 6;
the secondary flow channel is formed by a plurality of identical convex arc surfaces II 4 and a plurality of identical planes 3 in an alternating mode, the radius of each convex arc surface II 4 is 2mm, and the height of each convex arc surface II 4 is 0.4mm;
the concave arc surface 6 is adjacent to the convex arc surface II 4, and the length of the concave arc surface 6 is equal to that of the convex arc surface II 4;
the convex arc surface I5 is adjacent to the plane 3, and the length of the convex arc surface I5 is equal to that of the plane 3;
a plurality of inlet manifolds 1 are arranged in parallel, and the inlet manifolds 1 are communicated with primary flow channels;
a plurality of the outlet manifolds 2 are arranged in parallel, and the outlet manifolds 2 communicate with the primary flow passages.
The polarization curve of this example tested under conditions of 0.1MPa, 80 deg.C, 100% humidification at anode, 50% humidification at cathode, 1.5 stoichiometric ratio at anode, and 2.5 stoichiometric ratio at cathode is shown in FIG. 3.
Example 3
A corrugated flow field structure comprising a plurality of inlet manifolds 1, a plurality of outlet manifolds 2 and a central region between the inlet manifolds 1 and the outlet manifolds 2;
the central area is formed by a plurality of primary flow channels and a plurality of secondary flow channels in an alternating mode, and the primary flow channels and the secondary flow channels are arranged in parallel;
the primary flow channel is formed by alternately forming a plurality of same concave arc surfaces 6 and a plurality of same convex arc surfaces I5, the radius of each concave arc surface 6 is 2.5mm, the radius of each convex arc surface I5 is equal to that of each concave arc surface 6, and the height of each convex arc surface I5 is equal to that of each concave arc surface 6;
the secondary flow channel is formed by a plurality of identical convex arc surfaces II 4 and a plurality of identical planes 3 in an alternating mode, the radius of each convex arc surface II 4 is 2mm, and the height of each convex arc surface II 4 is 0.4mm;
the concave arc surface 6 is adjacent to the convex arc surface II 4, and the length of the concave arc surface 6 is equal to that of the convex arc surface II 4;
the convex arc surface I5 is adjacent to the plane 3, and the length of the convex arc surface I5 is equal to that of the plane 3;
a plurality of inlet manifolds 1 are arranged in parallel, and the inlet manifolds 1 are communicated with primary flow channels;
a plurality of the outlet manifolds 2 are arranged in parallel, and the outlet manifolds 2 communicate with the primary flow passages.
The polarization curve of this example tested under conditions of 0.1MPa, 80 deg.C, 100% humidification at anode, 50% humidification at cathode, 1.5 stoichiometric ratio at anode, and 2.5 stoichiometric ratio at cathode is shown in FIG. 3.
Claims (7)
1. A corrugated flow field structure characterized by: the central area of the flow field structure is formed by a plurality of primary flow channels and a plurality of secondary flow channels alternately;
the primary flow channel is formed by a plurality of same concave arc surfaces and a plurality of same convex arc surfaces I in an alternating mode;
the secondary flow channel is formed by a plurality of same convex arc surfaces II and a plurality of same planes in an alternating mode;
the primary flow channel and the secondary flow channel are arranged in parallel;
the primary flow channel is a main flow channel of gas and is also a main discharge channel of product water; the secondary flow channel not only has the function of a conventional flow field ridge, but also can communicate different flow channels, so that gas can flow in the range of the full battery;
the concave arc surface is adjacent to the convex arc surface II;
the convex arc surface I is adjacent to the plane.
2. The corrugated flow field structure of claim 1, wherein: the radius of the concave arc surface is equal to that of the convex arc surface I, and the radius of the concave arc surface is 2-2.5mm.
3. The corrugated flow field structure of claim 2, wherein: the height of the concave arc surface is equal to that of the convex arc surface I.
4. The corrugated flow field structure of claim 3, wherein: the radius of the convex arc surface II is 2mm.
5. The corrugated flow field structure of claim 4, wherein: the height of the convex arc surface II is 0.4-0.6mm.
6. The corrugated flow field structure of claim 5, wherein: the length of the concave arc surface is equal to that of the convex arc surface II.
7. The corrugated flow field structure of claim 6, wherein: the length of the convex arc surface I is equal to that of the plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911287491.1A CN112993303B (en) | 2019-12-14 | 2019-12-14 | Corrugated flow field structure |
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| CN201911287491.1A CN112993303B (en) | 2019-12-14 | 2019-12-14 | Corrugated flow field structure |
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| CN112993303A CN112993303A (en) | 2021-06-18 |
| CN112993303B true CN112993303B (en) | 2022-11-15 |
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| CN113675424B (en) * | 2021-07-27 | 2023-03-31 | 华南理工大学 | Derived corrugated flow field plate based on sine corrugations |
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| JP5287453B2 (en) * | 2009-04-13 | 2013-09-11 | トヨタ車体株式会社 | Gas flow path forming member used in fuel cell, manufacturing method thereof and molding apparatus |
| CN104253280B (en) * | 2014-09-04 | 2017-01-25 | 华中科技大学 | Solid-oxide-fuel-cell cathode gas flow field plate and preparation method thereof |
| JP6551291B2 (en) * | 2016-04-19 | 2019-07-31 | トヨタ車体株式会社 | Fuel cell gas flow path forming plate and fuel cell stack |
| KR101867696B1 (en) * | 2016-10-24 | 2018-06-15 | 현대제철 주식회사 | Fuel cell apparatus |
| JP2019067695A (en) * | 2017-10-04 | 2019-04-25 | トヨタ車体株式会社 | Gas passageway formation plate for fuel cell and fuel cell stack |
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