CN101212056A - Gas flow field for proton exchange membrane fuel cell - Google Patents
Gas flow field for proton exchange membrane fuel cell Download PDFInfo
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- CN101212056A CN101212056A CNA2006101350987A CN200610135098A CN101212056A CN 101212056 A CN101212056 A CN 101212056A CN A2006101350987 A CNA2006101350987 A CN A2006101350987A CN 200610135098 A CN200610135098 A CN 200610135098A CN 101212056 A CN101212056 A CN 101212056A
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- flow field
- gas
- parallel groove
- fuel cell
- proton exchange
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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 fuel cell with a proton exchange membrane and a gas flow field used thereof. The invention is characterized in that an exit and an entrance of the gas flow field are respectively provided with a section of reticular flow field, between which a parallel groove flow field is located. The reticular floe fields are connected with the parallel groove flow field. The invention has the advantages of small resistance, even gas distribution, simple structure and easy processing.
Description
Technical field
The present invention relates to Proton Exchange Membrane Fuel Cells, is a kind of used in proton exchange membrane fuel cell gas flowfield specifically.
Background technology
Fuel cell is a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT) that directly chemical energy is converted into electric energy by electrochemical means.Therefore it be not subjected to the restriction of Carnot cycle, energy conversion efficiency height, environmental friendliness without the overheated machine process.Because above these outstanding advantages, the research and development of fuel cell technology in the last few years are the attention of national governments and major company extremely, the cleaning that is considered to the 21 century first-selection is generation mode efficiently.
Proton exchange model fuel cell (PEMFC) is an electrolyte with perfluorinated sulfonic acid type solid polymer, platinum/carbon or platinum-ruthenium/carbon is eelctro-catalyst, hydrogen or purification reformation gas are fuel, and air or pure oxygen are oxidant, and having the graphite of gas flow channel or the metallic plate of surface modification is bipolar plates.During battery operation, electrode reaction: H takes place in the hydrogen of anode under the effect of catalyst
2→ 2H
++ 2e
-
The electronics that this electrode reaction produces arrives negative electrode through external circuit, and hydrogen ion then arrives negative electrode through proton exchange membrane.Oxygen and hydrogen ion and electronics are at negative electrode the Cheng Shui that reacts.
1/20
2+2H
++2e
-→H
2O
The key component of PEMFC comprises membrane electrode assembly and bipolar plates etc.Flow field on the bipolar plates plays a part gas and distributes.The flow field can be processed as one with pole plate, also can separate with pole plate.The function in flow field is the mobile direction of guiding reaction gas, guarantees that reaction gas is evenly distributed to electrode everywhere, arrives Catalytic Layer through electrode diffusion layer and participates in electrochemical reaction.In the design flow field, should guarantee that electrode can both obtain sufficient reactant everywhere, if somewhere reactant deficiency will cause this place's electrochemical reaction rates to slow down even reaction can not be carried out.Reacting gas falls moderate by the pressure in flow field.So far developed point-like, netted, porous body, parallel groove, snakelike and interdigital shape flow field.
The fluid distribution of mesh flow field more even, and help the reaction gas mass transfer, reduce concentration polarization, but resistance drop is higher.
The parallel groove flow field is to be arranged in parallel by straight channel to form.The handling ease in this kind of flow field, simple in structure, resistance is little, flexible design.Yet test shows that what reacting gas distributed is not very even in this kind of flow field runner, the distribution of flow and gas inlet-outlet position, and the sizes of runner etc. are different and variant.
The advantage of serpentine flow is that gas flow distribution is even, but gas the length of process longer, flow resistance is bigger, the required power consumption that is used to promote gas flow is bigger.The oversize concentration of runner downstream direction gas that also may cause of runner is not enough, and concentration polarization increases.Flexibility ratio is also less relatively during serpentine flow design simultaneously.
So far, the extensive flow field of adopting of PEMFC is based on parallel groove flow field and serpentine flow.
Summary of the invention
The object of the present invention is to provide a kind of simple effective method to transform the parallel groove flow field, keep the little advantage of its resistance simple in structure, and reduce the shortcoming of its reacting gas skewness.
For achieving the above object, technical scheme of the present invention is:
With the parallel groove runner is the flow field main body, and import and export section at gaseous reactant and join the preceding paragraph mesh flow field: the porch of gas is connected with one section mesh flow field, connects one section parallel groove runner thereafter, and the exit connects one section mesh flow field again.
A kind of used in proton exchange membrane fuel cell gas flowfield respectively is provided with one section mesh flow field in the outlet and the porch of gas flowfield, and the centre is the parallel groove flow field, and mesh flow field links to each other with middle parallel groove flow field.
The area summation of described entrance and exit place mesh flow field is the 5%-15% of the gas flowfield gross area; The area of entrance and exit place mesh flow field preferably equates.
The advantage that the present invention is provided with mesh flow field is: when reaction gas flows through this kind of flow field, easily form the mass transfer that local turbulence helps diffusion layer, gas can be even in the entire electrode surface distributed.The gas inlet-outlet section adds mesh flow field can alleviate the flow distribution inequality that causes because of factors such as gas inlet-outlet positions, and it is little to have a resistance, the characteristics of gas distributed uniform; Gas forms shearing force in the local turbulence of mesh flow field inside simultaneously, has improved the ability of carrying aqueous water secretly, has reduced the water logging problem of battery in outlet one side.Simultaneously mesh flow field and parallel trench flow field also all have simple in structure, the advantage that is easy to process.
Description of drawings
Fig. 1 is a flow field structure schematic diagram of the present invention.
Fig. 2 is for adopting flow field of the present invention battery pack and adopting common parallel groove flow field battery pack at 500mA/cm
2The performance of moving 10 minutes down compares.
Fig. 3 is Proton Exchange Membrane Fuel Cells that adopts flow field of the present invention and the battery performance schematic diagram that adopts common parallel groove flow field.
Embodiment
Technical scheme for a better understanding of the present invention further describes below in conjunction with accompanying drawing.
Flow field as shown in Figure 1, wherein 1,3 part is porch mesh flow field, exit mesh flow field, and the material of mesh flow field can be wire netting or other porous materials, and 2 is the parallel groove flow field, can adopt graphite or other metal material processing to form.The height unanimity of mesh flow field and parallel trench flow field.The area of the mesh flow field at entrance and exit place is according to relatively determining with the resistance drop in common parallel groove flow field, generally be no more than 25% of common parallel groove flow field resistance drop, the area summation of entrance and exit place mesh flow field probably is about the 5%-15% of the flow field gross area, and the centre is the parallel groove flow field as the flow field main body.
The influence of flow field that utilized experiment test to battery performance.In the experiment, an example is for adopting the battery in flow field of the present invention, and another example is for adopting the battery of common parallel groove graphite flow field.The battery that adopts flow field of the present invention is at 500mA/cm
2Following operation, battery single-unit ceiling voltage reaches 0.714V, and the battery that adopts common parallel groove graphite flow field is at 500mA/cm
2Following operation, the single-unit ceiling voltage is 0.686V, two routine batteries are at 500mA/cm
210 minutes performance of operation is shown in figure two under the condition.The volt-ampere curve of two routine batteries under the same operation condition is shown in figure three.From figure three as can be seen, adopt the battery performance in flow field of the present invention to compare with common parallel groove graphite flow field battery, certain improvement has been arranged on the performance, especially under high current densities, performance improves more obviously.
Claims (3)
1. used in proton exchange membrane fuel cell gas flowfield, it is characterized in that: outlet and porch at gas flowfield respectively are provided with one section mesh flow field, and the centre is the parallel groove flow field, and mesh flow field links to each other with middle parallel groove flow field.
2. according to the described gas flowfield of claim 1, it is characterized in that: the area summation of described entrance and exit place mesh flow field is the 5%-15% of the gas flowfield gross area.
3. according to the described gas flowfield of claim 1, it is characterized in that: the area of described entrance and exit place mesh flow field equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101350987A CN100517838C (en) | 2006-12-27 | 2006-12-27 | Gas flow field for proton exchange membrane fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101350987A CN100517838C (en) | 2006-12-27 | 2006-12-27 | Gas flow field for proton exchange membrane fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101212056A true CN101212056A (en) | 2008-07-02 |
| CN100517838C CN100517838C (en) | 2009-07-22 |
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ID=39611835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101350987A Active CN100517838C (en) | 2006-12-27 | 2006-12-27 | Gas flow field for proton exchange membrane fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100517838C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842062A (en) * | 2017-03-29 | 2017-06-13 | 广州中国科学院工业技术研究院 | Secondary cell thermal runaway test device and its method of testing |
| CN112242535A (en) * | 2019-07-16 | 2021-01-19 | 未势能源科技有限公司 | Bipolar plate structure for fuel cell, fuel cell and fuel cell vehicle |
-
2006
- 2006-12-27 CN CNB2006101350987A patent/CN100517838C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842062A (en) * | 2017-03-29 | 2017-06-13 | 广州中国科学院工业技术研究院 | Secondary cell thermal runaway test device and its method of testing |
| CN112242535A (en) * | 2019-07-16 | 2021-01-19 | 未势能源科技有限公司 | Bipolar plate structure for fuel cell, fuel cell and fuel cell vehicle |
| CN112242535B (en) * | 2019-07-16 | 2022-03-22 | 未势能源科技有限公司 | Bipolar plate structure for fuel cell, fuel cell and fuel cell vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100517838C (en) | 2009-07-22 |
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Effective date of registration: 20230117 Address after: 213000 No. 17, beitanghe East Road, Tianning District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Zhirui Bocheng Energy Technology Co.,Ltd. Address before: 401 #, Block A, No. 1, Torch Road, Qixianling, High-tech Zone, Dalian Patentee before: Sunrise Power Co.,Ltd. |