CN112993309A - Snakelike flow field structure - Google Patents
Snakelike flow field structure Download PDFInfo
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- CN112993309A CN112993309A CN201911287560.9A CN201911287560A CN112993309A CN 112993309 A CN112993309 A CN 112993309A CN 201911287560 A CN201911287560 A CN 201911287560A CN 112993309 A CN112993309 A CN 112993309A
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- flow field
- field structure
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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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- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a snakelike flow field structure, and belongs to the field of fuel cells. The center area of the flow field structure is provided with a plurality of S-shaped ridges II, the S-shaped ridges II are formed by connecting a plurality of S-shaped units end to end, and S-shaped gas channels are formed between every two adjacent S-shaped ridges II. The snakelike flow field structure has the advantages of good mass transfer effect, strong drainage capability and the like, and can remarkably improve the performance of the battery. Meanwhile, the snakelike flow field structure is simple to process, does not need a complex mold design, and can be realized by utilizing the traditional machining.
Description
Technical Field
The invention relates to a snakelike flow field structure, and belongs to the field of fuel cells.
Background
In recent years, due to the increasing exhaustion of fossil resources and the increasing prominence of environmental problems, people have been calling for new energy more and more. The proton exchange membrane fuel cell has the characteristics of absolute cleanness (only water is a product), high efficiency, mild working conditions, good concealment and the like, and has wide application prospects in the aspects of transportation, aerospace, portable power supplies and the like. In 2019, the domestic fuel cell industry is developing in a small and high tide, and fuel cell enterprises bloom all the time.
However, the fuel cell technology itself has a great promotion space throughout the current domestic fuel cell market, and the first time is the cell performance. The improvement of fuel cell technology can be generally promoted from three aspects of membrane electrode, bipolar plate and cell structure. The improvement in the aspect of membrane electrodes also enters a bottleneck stage at present, and high battery performance is often accompanied by high noble metal consumption; the structural design of the battery, particularly the electric pile, usually needs repeated experimental verification, and the experimental verification of the electric pile consumes a large amount of manpower and material resources. Optimization of the bipolar plate, and particularly the flow field, is the simplest and easiest approach, relatively speaking.
The flow field for the fuel cell is generally a parallel groove flow field, a serpentine flow field, an interdigitated flow field or a dotted flow field. A common feature of these flow fields is that they rely on molecular diffusion to transport reactants to the active sites, which also need to be driven out of the cell by concentration or drag forces. The flow fields are collectively called two-dimensional flow fields, and the two-dimensional flow field has the advantages of simple structure and low processing cost. However, with the development of fuel cells, the pursuit of working current density is higher and higher, the simple molecular diffusion cannot meet the requirement of reactants under the condition of high electric density, and the generated reaction water cannot be discharged out of the cell in time, so that a new flow field structure needs to be designed.
Since the advent of Mirai, toyota, three-dimensional flow fields became the focus of research for everyone. Compared with the traditional two-dimensional flow field, the three-dimensional flow field increases the disturbance vertical to the electrode plane, can promote the mass transfer and drainage in the battery, and increases the performance of the battery under the condition of high electric density. However, the corresponding cost of the three-dimensional flow field is high, and the requirements for the process are increased, so that the application is limited.
Disclosure of Invention
When a fuel cell is operated at a high current density, the problems of insufficient reaction gas, incapability of timely discharging products, incapability of timely dissipating heat and the like are usually encountered, and as a result, the performance of the cell is rapidly reduced, and the temperature of the cell can rapidly rise when the performance is severe, thereby causing accidents. In order to solve the problems, the invention designs a novel flow field structure which can promote the transfer of gas from a flow channel to an active site and the discharge of reactants from the active site of a battery under the work of high current density, thereby improving the performance of the battery.
The invention provides a snake-shaped flow field structure, wherein a plurality of snake-shaped ridges II are arranged in the central area of the flow field structure, each snake-shaped ridge II is formed by connecting a plurality of s-shaped units end to end, and snake-shaped gas channels are formed between every two adjacent snake-shaped ridges II.
The invention preferably has a linear distance between the two ends of the s-shaped unit of 1-10 mm.
The invention preferably has the arc radius of the s-shaped unit of 0.5-20 mm.
The present invention preferably has a height of said s-shaped elements of 0.2-2 mm.
The present invention preferably provides that the height of each of said s-shaped elements is the same.
The invention preferably adopts a parallel arrangement of a plurality of serpentine ridges II.
According to the invention, the flow field structure is preferably provided with a plurality of ridges I, a gas inlet channel is formed between every two adjacent ridges I, and the gas inlet channel is communicated with the snake-shaped gas flow channel.
The present invention preferably has a plurality of the ridges i arranged in parallel.
According to the invention, preferably, the flow field structure is provided with a plurality of ridges III, a gas outlet channel is formed between every two adjacent ridges III, and the gas outlet channel is communicated with the snake-shaped gas flow channel.
The present invention preferably has a plurality of said ridges iii arranged in parallel.
The turbulent motion degree of the gas in the s-shaped unit is controlled by adjusting three parameters of the linear distance between two ends of the s-shaped unit, the arc radius of the s-shaped unit and the height of the s-shaped unit, so that the mass transfer capacity of the gas is adjusted, and the performance of the battery is changed.
The invention has the beneficial effects that:
the snakelike flow field structure has the advantages of good mass transfer effect, strong drainage capability and the like, and can remarkably improve the performance of the battery. Meanwhile, the snakelike flow field structure is simple to process, does not need a complex mold design, and can be realized by utilizing the traditional machining. The snakelike flow field structure has great application potential in the fields of proton exchange membrane fuel cells and direct methanol fuel cells.
Drawings
In the figure 3 of the attached drawings of the invention,
FIG. 1 is a schematic structural view of a serpentine flow field structure according to the present invention;
FIG. 2 is a schematic structural view of an s-shaped unit according to the present invention;
FIG. 3 is a graph of I-V curves for the batteries of examples 1-4;
wherein: 1. ridge I, 2, snakelike ridge II, 3, snakelike gas flow channel, 4, ridge III, 5, the S-shaped unit.
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 snakelike flow field structure is characterized in that a plurality of snakelike ridges II 2 are arranged in the central area of the flow field structure, the snakelike ridges II 2 are arranged in parallel, each snakelike ridge II 2 is formed by connecting a plurality of s-shaped units 5 end to end, the linear distance L between two ends of each s-shaped unit 5 is 2mm, the arc radius R of each s-shaped unit 5 is 2mm, the height H of each s-shaped unit 5 is 0.4mm, the height H of each s-shaped unit 5 is identical, and a snakelike gas flow channel 3 is formed between every two adjacent snakelike ridges II 2;
the flow field structure is provided with a plurality of ridges I1, the ridges I1 are arranged in parallel, a gas inlet channel is formed between every two adjacent ridges I1, and the gas inlet channel is communicated with the snake-shaped gas flow channel 3;
the flow field structure is equipped with a plurality of ridges III 4, and is a plurality of III 4 parallel arrangement of ridge is adjacent form gas outlet channel between the ridge III 4, gas outlet channel and snakelike gas flow channel 3 intercommunication.
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. From FIG. 3, at 1000mA/cm2The cell voltage of this example reached 0.65V or more at the current density.
Example 2
A plurality of S-shaped ridges II 2 are arranged in the central area of a flow field structure, the S-shaped ridges II 2 are arranged in parallel, the S-shaped ridges II 2 are formed by connecting a plurality of S-shaped units 5 end to end, the linear distance L between two ends of each S-shaped unit 5 is 2mm, the arc radius R of each S-shaped unit 5 is 1.5mm, the height H of each S-shaped unit 5 is 0.4mm, the height H of each S-shaped unit 5 is the same, and a S-shaped gas flow channel 3 is formed between every two adjacent S-shaped ridges II 2;
the flow field structure is provided with a plurality of ridges I1, the ridges I1 are arranged in parallel, a gas inlet channel is formed between every two adjacent ridges I1, and the gas inlet channel is communicated with the snake-shaped gas flow channel 3;
the flow field structure is equipped with a plurality of ridges III 4, and is a plurality of III 4 parallel arrangement of ridge is adjacent form gas outlet channel between the ridge III 4, gas outlet channel and snakelike gas flow channel 3 intercommunication.
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. From FIG. 3, at 1000mA/cm2The cell voltage of this example can reach 0.68V or more at the current density.
Example 3
A plurality of S-shaped ridges II 2 are arranged in the central area of a flow field structure, the S-shaped ridges II 2 are arranged in parallel, the S-shaped ridges II 2 are formed by connecting a plurality of S-shaped units 5 end to end, the linear distance L between two ends of each S-shaped unit 5 is 4mm, the arc radius R of each S-shaped unit 5 is 1.5mm, the height H of each S-shaped unit 5 is 0.4mm, the height H of each S-shaped unit 5 is the same, and a S-shaped gas flow channel 3 is formed between every two adjacent S-shaped ridges II 2;
the flow field structure is provided with a plurality of ridges I1, the ridges I1 are arranged in parallel, a gas inlet channel is formed between every two adjacent ridges I1, and the gas inlet channel is communicated with the snake-shaped gas flow channel 3;
the flow field structure is equipped with a plurality of ridges III 4, and is a plurality of III 4 parallel arrangement of ridge is adjacent form gas outlet channel between the ridge III 4, gas outlet channel and snakelike gas flow channel 3 intercommunication.
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. From FIG. 3, at 1000mA/cm2The cell voltage of this example can reach 0.68V or more at the current density.
Example 4
A snakelike flow field structure is characterized in that a plurality of snakelike ridges II 2 are arranged in the central area of the flow field structure, the snakelike ridges II 2 are arranged in parallel, each snakelike ridge II 2 is formed by connecting a plurality of s-shaped units 5 end to end, the linear distance L between two ends of each s-shaped unit 5 is 2mm, the arc radius R of each s-shaped unit 5 is 2mm, the height H of each s-shaped unit 5 is 0.6mm, the height H of each s-shaped unit 5 is identical, and a snakelike gas flow channel 3 is formed between every two adjacent snakelike ridges II 2;
the flow field structure is provided with a plurality of ridges I1, the ridges I1 are arranged in parallel, a gas inlet channel is formed between every two adjacent ridges I1, and the gas inlet channel is communicated with the snake-shaped gas flow channel 3;
the flow field structure is equipped with a plurality of ridges III 4, and is a plurality of III 4 parallel arrangement of ridge is adjacent form gas outlet channel between the ridge III 4, gas outlet channel and snakelike gas flow channel 3 intercommunication.
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. From FIG. 3, at 1000mA/cm2The cell voltage of this example reached 0.67V or more at the current density.
Claims (10)
1. A serpentine flow field structure, comprising: the central area of flow field structure is equipped with a plurality of snakelike ridges II, snakelike ridge II comprises a plurality of s shape unit end to end, and is adjacent snakelike gas flow channel is formed between the snakelike ridge II.
2. The serpentine flow field structure of claim 1, wherein: the linear distance between the two ends of the s-shaped unit is 1-10 mm.
3. The serpentine flow field structure of claim 2, wherein: the arc radius of the s-shaped unit is 0.5-20 mm.
4. The serpentine flow field structure of claim 3, wherein: the height of the s-shaped unit is 0.2-2 mm.
5. The serpentine flow field structure of claim 4, wherein: the height of each s-shaped unit is the same.
6. The serpentine flow field structure of claim 5, wherein: a plurality of the serpentine ridges II are arranged in parallel.
7. The serpentine flow field structure of claim 6, wherein: the flow field structure is equipped with a plurality of ridges I, and is adjacent form gas inlet passageway between the ridge I, gas inlet passageway and snakelike gas flow channel intercommunication.
8. The serpentine flow field structure of claim 7, wherein: a plurality of the ridges i are arranged in parallel.
9. The serpentine flow field structure of claim 8, wherein: the flow field structure is provided with a plurality of ridges III, and is adjacent to form a gas outlet channel between the ridges III, and the gas outlet channel is communicated with the snake-shaped gas flow channel.
10. The serpentine flow field structure of claim 9, wherein: a plurality of the ridges iii are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911287560.9A CN112993309A (en) | 2019-12-14 | 2019-12-14 | Snakelike flow field structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911287560.9A CN112993309A (en) | 2019-12-14 | 2019-12-14 | Snakelike flow field structure |
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| CN112993309A true CN112993309A (en) | 2021-06-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299343A (en) * | 2011-07-26 | 2011-12-28 | 武汉理工大学 | Leaf biomimetic structure based bipolar plate for proton exchange membrane fuel cells |
| CN108695524A (en) * | 2018-07-03 | 2018-10-23 | 武汉轻工大学 | Dual polar plates of proton exchange membrane fuel cell |
| CN108899562A (en) * | 2018-07-09 | 2018-11-27 | 北京氢璞创能科技有限公司 | A kind of fuel battery double plates |
| CN109390603A (en) * | 2018-11-15 | 2019-02-26 | 华南理工大学 | A kind of ripple flow-field plate |
| CN109509896A (en) * | 2018-12-11 | 2019-03-22 | 中国科学院大连化学物理研究所 | A kind of flow field structure improving fuel battery double plates waveform fluid flow on channel effective area |
| CN208955150U (en) * | 2018-11-22 | 2019-06-07 | 南京户能电子科技有限公司 | A kind of liquid cooling structure of snakelike drainage |
-
2019
- 2019-12-14 CN CN201911287560.9A patent/CN112993309A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299343A (en) * | 2011-07-26 | 2011-12-28 | 武汉理工大学 | Leaf biomimetic structure based bipolar plate for proton exchange membrane fuel cells |
| CN108695524A (en) * | 2018-07-03 | 2018-10-23 | 武汉轻工大学 | Dual polar plates of proton exchange membrane fuel cell |
| CN108899562A (en) * | 2018-07-09 | 2018-11-27 | 北京氢璞创能科技有限公司 | A kind of fuel battery double plates |
| CN109390603A (en) * | 2018-11-15 | 2019-02-26 | 华南理工大学 | A kind of ripple flow-field plate |
| CN208955150U (en) * | 2018-11-22 | 2019-06-07 | 南京户能电子科技有限公司 | A kind of liquid cooling structure of snakelike drainage |
| CN109509896A (en) * | 2018-12-11 | 2019-03-22 | 中国科学院大连化学物理研究所 | A kind of flow field structure improving fuel battery double plates waveform fluid flow on channel effective area |
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Application publication date: 20210618 |