CN101630746A - Fuel cell flow field plate with anti-seepage and hydrophobic performance as well as special impregnant, impregnation method and device thereof - Google Patents
Fuel cell flow field plate with anti-seepage and hydrophobic performance as well as special impregnant, impregnation method and device thereof Download PDFInfo
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- CN101630746A CN101630746A CN200910147748A CN200910147748A CN101630746A CN 101630746 A CN101630746 A CN 101630746A CN 200910147748 A CN200910147748 A CN 200910147748A CN 200910147748 A CN200910147748 A CN 200910147748A CN 101630746 A CN101630746 A CN 101630746A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a fuel cell flow field plate with of anti-seepage and hydrophobic performance, a special impregnant, an impregnation method and a device thereof. Cleaning, drying, vacuum and pressurization dipping with PTFE emulsion, drying and A flow field plate is cleaned, dried and plastic treatment are carried out on a flow field palate to obtain the fuel cell flow field plate impregnated by the PTFE emulsion. In the invention, the PTFE, a special polymer agent with unique characteristic is utilized to impregnate the flow field plate so that the mechanical strength of a graphite carbon plate can not be changed, the seepage capability of air in the carbon plate is greatly reduced, furthermore the key component membrane electrode MEA of the fuel cell can be ensured to subject any influences and hydrophobic treatment can be carried out on the surface of the flow field plate. Besides applied to the graphite carbon plate, the invention also can be applied to the impregnation treatment of flow field plates made of other materials to obtain the flow field plates with the anti-seepage and hydrophobic performance.
Description
Technical field
The present invention relates to fuel cell field, is the graphite flow field plates of fuel cell specifically.
Background technology
Fuel cell is a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT) that directly chemical energy is changed into electric energy, and is environmentally friendly during this device generating, can realize fully that zero discharge, noise are low, and generating efficiency height, power density height, starts soon, is widely used.Based on these advantages, fuel cell more and more is subjected to the support energetically of Ministry of Energy of domestic and international government.Wherein the development of Proton Exchange Membrane Fuel Cells especially is subjected to the research and the application of every field.
Pile in the Proton Exchange Membrane Fuel Cells is in series by a plurality of monolithic batteries, in each monocell monomer, forms by the membrane electrode (MEA) in the middle of two blocks of gas stream field plates and the flow-field plate.Wherein the anode of each monocell then is close together with the negative electrode of adjacent single cells; Or the two sides of same flow-field plate all is carved with the flow field that gas stream is crossed, and wherein one side is an anode, and another side is a negative electrode.
The fuel gas that uses in the Proton Exchange Membrane Fuel Cells is hydrogen, because the hydrogen molecule diameter is little, and hydrogen is again to flow in flow-field plate under certain pressure, so hydrogen shows very strong penetrating power, should be material fine and close, that gas is difficult for infiltration so the material of flow-field plate is done in choosing.The flow-field plate overwhelming majority of Proton Exchange Membrane Fuel Cells is that former material processes from strand with the graphite carbon plate.Because be subjected to the production sintering process condition influence of graphite carbon plate, the graphitic carbon intralamellar part that causes producing has the micropore of many apertures at 5-10 μ m, and voidage is up to 18%-32%; And the hydrogen molecule kinetic diameter only is 0.289nm, so the aperture in the graphite carbon plate for hydrogen just as a huge passage, can directly cause the fuel gas of anode use or the oxygen of negative electrode use to be gone here and there mutually like this, cause the direct reaction of fuel battery inside hydrogen and oxygen, the lighter produces very big heat and MEA is burnt out, and weight person then causes burning.Therefore, the graphite flow field plates that the sintering that fuel cell adopted comes out must be passed through impregnation process, fills internal void with impregnating agent.
Again because Proton Exchange Membrane Fuel Cells negative electrode in work has water to generate, and the gas that uses in the fuel cell system that has may be through adding wet process, cause having in the flow-field plate existence of big water gaging, if water can not in time be discharged, then cause the water logging of MEA easily, this situation has very big influence to fuel battery performance.Therefore convection current field plate surface hydrophobicity is handled and is also seemed particularly important.
In the present carbon plate impregnation process technology, impregnating agent is coal tar, pitch, oil, grease, paraffin, inorganic salts and organic reagent etc., all can play good filling effect to the material internal hole, can reach the function that prevents that gas from collaborating.But for fuel cell, because the self-characteristic of these impregnating agent, what have behind the dipping may discharge certain poisonous gas that has, that have even have organic grease material and ooze out, also there are some metal ions in the impregnating agent that has, can produce very large influence the MEA performance of fuel cell.
PTFE (polytetrafluoroethylene) emulsion composition is fairly simple, and the back that is heating and curing forms a kind of plastic resin of function admirable, can not produce toxic gas or organic grease thing, and also metal ion not is many at present as anti-stick material, for example coatings of non-stick pan.
Summary of the invention
Gas permeation and waterproof problem at the flow-field plate of fuel cell exists the object of the present invention is to provide a kind of novel fuel cell flow field board, and this flow-field plate has good antiseep and hydrophobic performance concurrently, and does not have harmful substances.
The present invention adopts following technical scheme: a kind of fuel cell flow field board with antiseep and hydrophobic performance, comprise the flow-field plate matrix, and described flow-field plate matrix is through PTFE emulsion dipping.
The present invention also provides a kind of flow-field plate special-purpose impregnating agent, it is characterized in that described impregnating agent is the PTFE emulsion.
The PTFE emulsion of described dipping usefulness, can adopt the quality percentage composition is 5～90 emulsion, preferred 60%, content too high osmosis can be poor, to the flow-field plate internal penetration, the bad needs of too low dipping effect flood repeatedly when being unfavorable for flooding, and increase the workload of impregnation process time.
In addition, the present invention also provides a kind of impregnation process method of flow-field plate:
(1) cleans the flow-field plate that is carved with runner with acetone and other organic solvent and water, dry processing after having cleaned;
(2) chilled flow-field plate is flooded with the PTFE emulsion;
(3) wiping is carried out on the graphite flow field plates surface after will flooding, and the graphite flow field plates that sassafras was wiped away is carried out heat treated, makes the PTFE plasticizing.
Situation according to dipping can also repeat the operating process of an above-mentioned steps (2) and (3) at least, so that dipping evenly, fully.
Drying course in the described step (1) can carry out in baking oven, is incubated under 50～200 ℃ of conditions.
In order to improve the uniformity that impregnating agent in the dipping process floods inside and outside the speed of flow-field plate infiltration and flow-field plate, more satisfactory is to adopt vacuum impregnation, promptly under vacuum state, flood, to reduce air drag in the hole, specifically can adopt following process to operate: 1. chilled flow-field plate to be put into impregnation tank, impregnation tank is evacuated down to 0.001～0.05MPa; 2. with the charging in impregnation tank of PTFE emulsion, exceed flow-field plate, close the charging valve, continue to vacuumize, make to keep vacuum shape certain hour in the storage tank up to the PTFE emulsion by charging valve on the dip pipe and pipeline.
For improving dipping effect, can also comprise a pressure process further 3., promptly after 2. step is finished, start air compressor, in impregnation tank, pressurize, with the infiltration of facilitating impregnation agent.The employing two step modes that vacuumize and pressurize can improve dipping efficient and quality.
Described step 2. in, when in impregnation tank, advancing the PTFE emulsion, can make the PTFE emulsion exceed flow-field plate 1～20cm, generally be controlled at about 5cm, guarantee that flow-field plate is to be immersed in fully in the PTFE emulsion in whole process.
Described step 2. in, can after vacuumizing 0.5h, close vacuum pump and extraction valve again, make to keep vacuum shape 2h in the storage tank, be beneficial to emulsion and further in flow-field plate, permeate fully.
Described step 3. in, can in storage tank, be forced into 0.2～1MPa, pressurization 0.1～4h improves the motive force of infiltration by external pressurized.
In above-mentioned steps (3), muffle furnace heating plasticizing processing procedure can for: earlier be warming up to 150～200 ℃ in 1h, insulation 0.1～5h is to dry; In muffle furnace, continue temperature then and rise to 300～400 ℃, insulation 0.1～2h, generally at 360 ℃ of insulation 0.5h, if the temperature of control is lower slightly in the said temperature scope, it is long then to dry and plastify the time that needs, the high time weak point of temperature, efficient height.
The present invention also provides a kind of immersion system, comprise an impregnation tank and the storage tank that is used to store the PTFE emulsion, described impregnation tank also is communicated with described storage tank by inlet valve and feed pipe, comprise that also vacuum pump communicates with described impregnation tank by extraction valve and pipeline, so that vacuumize.
Immersion system can also comprise air compressor, communicates with described impregnation tank by intake valve and pipeline, so that short the oozing of pressurizeing.
The present invention adopts the polymeric reagent convection current field plate of this unique property of PTFE to do impregnation process, not only can not change the mechanical strength of graphite carbon plate self and gas penetrating power in carbon plate is reduced greatly, can also guarantee that key component membrane electrode MEA is not affected in the fuel cell, meanwhile can also play the hydrophobic treatment function in convection current field plate surface.Except that can be used for the graphite carbon plate, also can be used for the impregnation process of other material flow-field plate, to obtain to have concurrently the flow-field plate of anti-gas-leak and hydrophobic performance.
Description of drawings
Fig. 1 is an immersion system schematic diagram of the present invention.
Fig. 2 is the impregnation technology flow chart.
Fig. 3 is graphite flow field plates dipping back cutaway view.
Fig. 4 floods preceding water droplet at graphite cake surface configuration figure for graphite flow field plates.
Fig. 5 floods the back water droplet at graphite cake surface configuration figure for graphite flow field plates.
Embodiment
Below by specific embodiment the present invention is described in further detail.
Embodiment 1 immersion system
Be used for graphite flow field plates is carried out the immersion system of impregnation process, as shown in Figure 1, comprise an impregnation tank 3 and the storage tank 1 that is used to store the PTFE emulsion, impregnation tank 3 also is communicated with storage tank 1 by inlet valve 2 and feed pipe, comprise that also vacuum pump 4 communicates with impregnation tank 3 by extraction valve 5 and pipeline, so that vacuumize.
Also comprise air compressor 7, also communicate, so that short the oozing of pressurizeing with impregnation tank 3 by intake valve 6 and pipeline.
Embodiment 2 dipping methods
With reference to Fig. 2 and shown in Figure 1, its dipping process is:
Clean and oven dry: choosing graphite carbon plate (the lasting Group Co.,Ltd in Qingdao provides) is raw material, be machined to the required fuel cell flow field board of fuel cell with finishing impression, clean through being carved with the graphite flow field plates of runner, so that organic and inorganic water-solubility impurity, dirt are washed with acetone and pure water.Put into baking oven after having cleaned,, dry at 150 ℃ of insulation 2h.
Vacuumize: chilled graphite flow field plates is put into impregnation tank 3 seal impregnation tank then, open the valve 5,8 on vacuum pump and the pipeline, impregnation tank is evacuated down to-0.1MPa, close vacuum pump after vacuumizing 0.5h, close extraction valve 5 simultaneously with vacuum pump 4.
Vacuum impregnation: the storage tank 1 that will store concentration and be 60% PTFE emulsion is opened with the inlet valve 2 on impregnation tank 3 connecting pipes, because in the impregnation tank 3 is vacuum state, the PTFE emulsion is sucked in the impregnation tank 3 under two pressure tank difference effects, exceed about graphite flow field plates 5cm up to the PTFE emulsion, close inlet valve 2 and stop into PTFE emulsion.Open vacuum pump 4 and extraction valve 5 and valve 8 and continue to vacuumize after the 0.5h, close vacuum pump and extraction valve 5 again, make to keep vacuum shape 2h in the impregnation tank.
Impregnating by pressure: open air compressor 7, in impregnation tank 3, be forced into 0.5MPa, pressurization 2h.
Oven dry: open impregnation tank, take out the graphite flow field plates of impregnated mistake, a little the graphite surface sassafras is wiped away totally with clean rag.The graphite flow field plates that sassafras was wiped away is put into muffle furnace and is heat-treated, and is warming up to 180 ℃ in the 1h, and insulation 2h is dried.
Plasticizing: muffle furnace continues temperature and rises to 360 ℃, and insulation 0.5h plastifies.
Be evacuated to the plasticizing operation above repeating once again, obtain the fuel cell graphite flow-field plate product through PTFE emulsion impregnation process, as shown in Figure 3,10 is graphite flow field plates, 20 hydrophobic layers for PTFE emulsion plasticizing back formation, and 30 is runner.
As the PTFE emulsion of impregnating agent, its technical indicator is as shown in table 1.
Table 1 is a 60%PTFE emulsion technology index
| Outward appearance | Solid content | Particle diameter | Viscosity | Density | The incipient melting peak value |
| The white emulsion liquid | ?60％(w％) | ??0.210μm | ??25mPa·s | ??1.5g/cm 3 | ??337℃ |
The technical performance of the graphite flow field plates before and after the impregnation process is as shown in table 2.
Table 2 is correlated performance comparative result before and after the dipping plasticizing
| Content | Density g/cm 3 | Resistivity μ Ω m | Compressive strength MP | Voidage % | The performance of collaborating |
| Before the dipping | ??1.85 | ?15 | ??78 | ??18.5 | It is very severe to collaborate under the 30KPa air pressure |
| Behind the dipping | ??2.15 | ?19 | ??78 | ??3.5 | 0.3MPa air pressure does not have the phenomenon of collaborating down |
As can be seen from Table 2, after using PTFE emulsion impregnation process, the intensity of graphite flow field plates does not change, and resistivity slightly goes up rising, and voidage obviously reduces, and does not have the phenomenon of collaborating under 0.3MPa air pressure.
Before dipping, water droplet 40 drop on the graphite flow field plates 10 shape as shown in Figure 4, show that water has immersional wetting to graphite flow field plates before the impregnation process.And after the impregnation process, water droplet 40 drop in into the shape on the graphite flow field plates 10 as shown in Figure 5, be pearl, show that graphite flow field plates has hydrophobicity.
Claims (12)
1, a kind of fuel cell flow field board with antiseep and hydrophobic performance comprises the flow-field plate matrix, it is characterized in that: described flow-field plate matrix is through PTFE emulsion dipping.
2, the special-purpose impregnating agent of a kind of flow-field plate, it is characterized in that: described impregnating agent is the PTFE emulsion.
3, a kind of impregnation process method of flow-field plate is characterized in that this method in turn includes the following steps:
(1) cleans the flow-field plate that is carved with runner with organic solvent and water, dry after having cleaned;
(2) chilled flow-field plate is flooded with the PTFE emulsion;
(3) wiping is carried out on the flow-field plate surface after will flooding, and the flow-field plate that sassafras was wiped away is carried out heat treated, makes the PTFE plasticizing.
4, the impregnation process method of flow-field plate as claimed in claim 3 is characterized in that: at least also repeat an above-mentioned steps (2) and step (3).
5, as the impregnation process method of claim 3 or 4 described flow-field plate, it is characterized in that: the drying course in the described step (1) is to carry out in baking oven, 50～200 ℃ of insulations.
6, as the impregnation process method of claim 3 or 4 described flow-field plate, it is characterized in that: the PTFE emulsion in the described step (2) is that employing PTFE polymer quality percentage composition is 60% emulsion.
7,, it is characterized in that the dipping process in the described step (2) is: 1. chilled flow-field plate is put into impregnation tank, impregnation tank is evacuated to 0.001～0.05MPa as the impregnation process method of claim 3 or 4 described flow-field plate; 2. with the charging in impregnation tank of PTFE emulsion, exceed flow-field plate, close the charging valve, continue to vacuumize, make to keep vacuum shape certain hour in the storage tank up to the PTFE emulsion by charging valve on the dip pipe and pipeline.
8, the impregnation process method of flow-field plate as claimed in claim 7 is characterized in that: also comprising a pressure process further 3., is after 2. step is finished, and starts air compressor, pressurizes in storage tank, with the infiltration of facilitating impregnation agent.
9, the impregnation process method of flow-field plate as claimed in claim 8 is characterized in that: described step 3. in, pressurized operation pressure is 0.2～1MPa in storage tank, keep the pressurization 0.1～4h.
10, as the impregnation process method of claim 3 or 4 described flow-field plate, it is characterized in that: in above-mentioned steps (3), in muffle furnace heating plasticizing processing procedure be: in 1h, be warming up to 150～200 ℃ earlier, insulation 0.1～5h, muffle furnace continuation temperature rises to 300～400 ℃ then, insulation 0.1～2h.
11, a kind of immersion system, comprise an impregnation tank and the storage tank that is used to store the PTFE emulsion, described impregnation tank also is communicated with described storage tank by inlet valve and feed pipe, comprises that also vacuum pump communicates with described impregnation tank by extraction valve and pipeline, so that vacuumize.
12, immersion system as claimed in claim 11 is characterized in that: also comprise air compressor, communicate with described impregnation tank by intake valve and pipeline, impel the infiltration of impregnating agent so that pressurize.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910147748A CN101630746A (en) | 2009-06-19 | 2009-06-19 | Fuel cell flow field plate with anti-seepage and hydrophobic performance as well as special impregnant, impregnation method and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910147748A CN101630746A (en) | 2009-06-19 | 2009-06-19 | Fuel cell flow field plate with anti-seepage and hydrophobic performance as well as special impregnant, impregnation method and device thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544548A (en) * | 2012-02-27 | 2012-07-04 | 新源动力股份有限公司 | Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof |
| CN102544455A (en) * | 2010-10-09 | 2012-07-04 | 荷贝克电池***股份有限公司 | Method for producing a positive nickel-hydroxide electrode for a nickel-metal hydrid or nickel-cadmium battery |
| CN107331875A (en) * | 2017-08-14 | 2017-11-07 | 福建亚南电机有限公司 | A kind of carbon paper hydrophobic treatment device |
| CN110197912A (en) * | 2018-02-24 | 2019-09-03 | 航天特种材料及工艺技术研究所 | A kind of graphite bipolar plate material and preparation method |
| CN112563525A (en) * | 2019-09-26 | 2021-03-26 | 荆门市格林美新材料有限公司 | Regeneration method of graphite electrode plate of fuel cell |
| WO2021077644A1 (en) * | 2019-10-22 | 2021-04-29 | 清华大学 | Bipolar plate of fuel cell and processing method therefor |
| CN113161566A (en) * | 2021-03-19 | 2021-07-23 | 东睦新材料集团股份有限公司 | Preparation method of metal support plate for fuel cell |
| WO2022193525A1 (en) * | 2021-03-19 | 2022-09-22 | 东睦新材料集团股份有限公司 | Method for manufacturing metal support plate for fuel cell |
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2009
- 2009-06-19 CN CN200910147748A patent/CN101630746A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544455A (en) * | 2010-10-09 | 2012-07-04 | 荷贝克电池***股份有限公司 | Method for producing a positive nickel-hydroxide electrode for a nickel-metal hydrid or nickel-cadmium battery |
| CN102544548A (en) * | 2012-02-27 | 2012-07-04 | 新源动力股份有限公司 | Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof |
| CN107331875A (en) * | 2017-08-14 | 2017-11-07 | 福建亚南电机有限公司 | A kind of carbon paper hydrophobic treatment device |
| CN110197912A (en) * | 2018-02-24 | 2019-09-03 | 航天特种材料及工艺技术研究所 | A kind of graphite bipolar plate material and preparation method |
| CN112563525A (en) * | 2019-09-26 | 2021-03-26 | 荆门市格林美新材料有限公司 | Regeneration method of graphite electrode plate of fuel cell |
| WO2021077644A1 (en) * | 2019-10-22 | 2021-04-29 | 清华大学 | Bipolar plate of fuel cell and processing method therefor |
| CN113161566A (en) * | 2021-03-19 | 2021-07-23 | 东睦新材料集团股份有限公司 | Preparation method of metal support plate for fuel cell |
| WO2022193525A1 (en) * | 2021-03-19 | 2022-09-22 | 东睦新材料集团股份有限公司 | Method for manufacturing metal support plate for fuel cell |
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