CN106848362A - The integrated light-duty pile of metallic graphite carbon composite bipolar plate fuel battery and its manufacture method - Google Patents
The integrated light-duty pile of metallic graphite carbon composite bipolar plate fuel battery and its manufacture method Download PDFInfo
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- CN106848362A CN106848362A CN201710093909.XA CN201710093909A CN106848362A CN 106848362 A CN106848362 A CN 106848362A CN 201710093909 A CN201710093909 A CN 201710093909A CN 106848362 A CN106848362 A CN 106848362A
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
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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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
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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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/96—Carbon-based electrodes
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The present invention relates to a kind of integrated light-duty pile of metallic graphite carbon composite bipolar plate fuel battery.The pile uses the integrated metallic graphite carbon composite dual-electrode plates being made up of metal corrugated plate and graphite cake, and wherein metal corrugated plate is minus plate, and raised keel chamber is oxygen flow field on metal corrugated plate, and raised ridge takes into account radiated rib simultaneously；Graphite cake is positive plate, and it is that have a hydrogen flow field in a side surface of graphite cake body, and is provided with seal groove at the edge of the side surface, and the opposite side of graphite cake body is graphite board corrugated structure；Graphite cake is embedded in metal corrugated plate and is connected as one by graphite board corrugated structure.The performance and stability of pile of the present invention are obviously improved.Because of doped negative temperature coefficient thermistor material in graphite cake material, the cold start-up time can be reduced significantly, and enable normal use under higher temperature of the pile more than 60 DEG C.
Description
Technical field
The invention belongs to the light-duty pile technical field of fuel cell, more particularly to a kind of integrated metal-graphite Composite Double
The light-duty pile of pole plate fuel cell and its manufacture method.
Background technology
Chemical energy in fuel directly can be changed into electric energy and without combustion by Proton Exchange Membrane Fuel Cells (PEMFC)
Burn, with cleaning, efficiently, energy-saving and environmental protection, simple structure, toggle speed is fast, power density is high, the characteristic such as applied widely and
Get the attention, convenient is that traffic and aviation field provide dynamical system.Bipolar plates are the core components of PEMFC, and its is heavy
Amount accounts for the 70%-80% of whole pile, and cost accounts for more than the 50% of pile.Meanwhile, bipolar plates also act as separation reacting gas simultaneously
Reacting gas is imported by fuel cell by flow field, is collected and conduct electric current and support membrane electrode, support membrane electrode assembly, uniform
The effect of reacting gas is distributed, the task of the radiating of whole fuel cell system is also undertaken, its performance quality directly affects battery
Power output and service life.Therefore, light-duty, easy processing bipolar plates are developed for improving pile specific power, reducing production
Cost, promotion PEMFC commercializations are significant
Bipolar plates are broadly divided into graphite bi-polar plate and the major class of metal double polar plates two.Metal double polar plates have that thickness is small, weight
Gently, it is easy to produce in batches, and the characteristics such as the specific power of fuel cell pack can be greatly improved and is paid close attention to by all circles.Metal bipolar
Plate is that sheet metal (aluminium, nickel, stainless sheet steel and titanium band) is struck out into the moon with various flow fields by die press technology for forming
Pole, anode unipolar plate, then two panels unipolar plate is welded together by composition bipolar plates by laser welding.Metal plate weld can only be
Linear contact lay or point contact, contact surface are narrow, and contact resistance is big, and general out-of-flatness.The stainless hardness of steel of wherein 316L is high, corrosion resistant
Corrosion can be protruded, and be to make a kind of most promising stainless steel material of metal double polar plates at present.The metallic plate of stainless steel
There are problems, be first that stainless steel surfaces easily form passivating film, increased the contact resistance of battery, so as to reduce battery
Power output.Secondly, working environment pH=2~4 of Proton Exchange Membrane Fuel Cells, stainless steel is susceptible to corrosion and produces gold
Category iron ion, nickel ion etc., make catalyst poisoning lose activity, and reduce the service life of pile.Graphite bi-polar plate has good
Electric conductivity, thermal conductivity and corrosion resistance.But the fragility of graphite causes processing difficulties, therefore the thickness of graphite bi-polar plate all exists
2~more than 3mm, the specific power reduction of the pile compared with metal double polar plates pile of its assembling.
The specific power of fuel cell is to weigh an important parameter of Performance data quality.In order to improve the ratio of fuel cell
Power, part producer selects pure titanium (TA0, TA1, TA2) as metallic sheet material, and the thickness of metal monopole plate is thinned to
Below 0.1mm.The consistent specific power density in order to pursue battery, that is, reduce the thickness of metallic plate, and metallic plate thinning also brings
A series of problem：The thinning of metallic plate, has been significantly increased the processing charges of metallic plate；The metal sheet plane one of thinning
As out-of-flatness, increase contact resistance, reduce pile performance output；The metal double polar plates of the metallic plate manufacture of thinning are also uneven
It is whole, the resistance between bipolar plates and membrane electrode is not only increased, pile is understood unbalance stress in assembling and is influenceed pile
Uniformity and stability；Metallic plate thinning, its intensity is relatively low, and many difficulties are brought to the assembling of pile；Metallic plate thinning, electricity
The insufficient strength of heap, loses the effect of support pile and against shock, and making the reliability of whole pile reduces.Patent
The light-duty pile of polymer dielectric film fuel cell and its manufacture method mentioned in CN104157895A, it is characterized in that by one piece
Metal corrugated plate and one piece of metal plate are formed by welding the positive contact of metal double polar plates, bipolar electrode flat sides and membrane electrode, ripple
Line face and the cathode contacts of membrane electrode, the flat metal plate of the described metal double polar plates air cooling fuel cell in this patent is without stream
, there are problems, first, diffusion of the influence anodic gas between the carbon paper of flow field；Secondly positive plate without flow field, easy ponding
And cause anode water logging；Finally, metal plate is big with the positive contact area of membrane electrode, easily corrosion.Therefore,
There is certain technological deficiency in the design of bipolar plates air cooling heap affiliated in CN104157895A.
In addition, the big bottleneck of fuel cell other is exactly difficult cold start-up.When battery is in sub-zero temperature
When, the aqueous water of inside battery electrochemical reaction generation and the water of anode can be frozen, and membrane electrode material can be caused during icing
The damage of material, catalyst comes off, so that fuel cell cannot normally start, influences the operating efficiency of fuel cell.At present,
In order to solve the cold start-up of fuel cell, it is former that most design tends to the embedded electrical heating between membrane electrode and bipolar plates
Part, while the cold start-up of fuel cell is solved the problems, such as, make the design of battery becomes more complicated to this method, increased
The weight of fuel cell.
The content of the invention
In view of the shortcomings of the prior art, light the invention provides a kind of integrated metal-graphite composite bipolar plate fuel battery
Type pile and its manufacture method.
The integrated light-duty pile of metal-graphite composite bipolar plate fuel battery, mainly including membrane electrode, bipolar plates, adopt electricity
Plate, end plate and fuel gas inlet and outlet piping, the membrane electrode are to be furnished with catalysis successively respectively in the both sides of polymer dielectric film
Layer and gas diffusion layers, the bipolar plates are the integrated metal-graphite composite dual-electrode plates that metal corrugated plate and graphite cake are constituted,
Wherein metal corrugated plate is minus plate, and raised keel chamber is oxygen flow field on metal corrugated plate, and raised ridge takes into account scattered simultaneously
Hot fin；Graphite cake is positive plate, and it is that have hydrogen flow field in a side surface of graphite cake body, and on the side of the side surface
Edge is provided with seal groove, and the opposite side of graphite cake body is graphite board corrugated structure；Graphite cake is embedded in by graphite board corrugated structure
In metal corrugated plate and connect as one；
N+1 pieces integration metal-graphite composite dual-electrode plates and N piece membrane electrodes are stacked gradually, wherein the seal groove of graphite cake
In be provided with sealing gasket, make between graphite cake and membrane electrode formed hydrogen electrochemical reaction confined space；Metal corrugated plate and film
It is the open spaces with air insertion between electrode；
It is sequentially arranged respectively in the upper and lower both sides of stacked body and adopts electroplax and end plate, and fastening is connected by screw rod.
The raw material composition of the graphite cake is calculated as with weight/mass percentage composition：68%~78% graphite substrate, 10%~
20% binding agent, 5% reinforcing agent, 2% conductive filler and 5% negative temperature coefficient heat-sensitive resistance material.The graphite
Base material is selected from native graphite, Delanium, expanded graphite；The binding agent is selected from phenolic resin, the fluoride-based resin of epoxy；Institute
State reinforcing agent and be selected from CNT, carbon fiber；The conductive filler is selected from carbon black, metal powder, and the metal powder can be passed through for grain
Bronze, silver powder or the nickel powder that 50 μm of ＜；Described negative temperature coefficient heat-sensitive resistance material is electric using the temperature-sensitive of Mn-Cu-X series
Resistance.
The thickness of the graphite cake body is 0.4~1mm.
The hydrogen flow field provides passage for the discharge of the water that the diffusion of hydrogen and electrochemical reaction are generated, and hydrogen flow field is
Parallel DC fields, serpentine flow, intertexture flow field or point-like flow field, the depth of hydrogen flow field is 0.05~0.5mm.
The sheet metal thickness of the metal corrugated plate is 0.05~0.2mm.
The surface that the metal corrugated plate is contacted with membrane electrode carries out good conductive and corrosion resistant using surface modification technologies
Erosion resisting coating treatment, specifically covers layer of precious metal, titanium nitride layer, titanium carbide layer or nickel based metal layer in wavy metal plate surface.
In the membrane electrode, card-protecting film is provided with the edge of polymer dielectric film.The card-protecting film can be thin in PET
The side of film is covered with EVA adhesive linkages, and card-protecting film thickness is 80 μm, and its Main Function is the edge part for protecting polymer dielectric film
Point.
The manufacture method of the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery, comprises the following steps：
1) preparation of integrated metal-graphite composite dual-electrode plates：
1. the side surface covering layer of precious metal of sheet metal, titanium nitride layer, titanium carbide layer or nickel based metal layer are carried out
The good conductive and corrosion-resistant finishes modification on surface；
2. the one of surface-modified treatment faces down and sheet metal is placed on the lower mould with corrugated surface, uses 20MPa
Power by sheet metal pre-molding；
3. in terms of weight/mass percentage composition, by 68%~78% graphite substrate, 10%~20% binding agent, 5% increasing
Strong agent, 2% conductive filler and 5% negative temperature coefficient heat-sensitive resistance material are sufficiently mixed and obtain Graphite Composite Powder, by stone
Black composite granule is inserted in lower mould, the bellows chamber on the upside of metal corrugated plate is filled full, and continues to fill up certain thickness, then
The mold with micro flow channel is covered, using compression-moulding methods heating pressurization one-shot forming, the molding temperature is 200
DEG C, molding pressure 35MPa, press time 1h, integration metal-graphite composite dual-electrode plates are obtained；
2) preparation of membrane electrode：Polymer dielectric film of the both sides with Catalytic Layer, gas are expanded by the method for hot pressing
Dissipate layer and card-protecting film encapsulates integral battery core；The temperature of the hot pressing is 101 DEG C, pressure 0.15MPa, time 20s；
3) fuel gas air inlet pipe and fuel gas escaping pipe are respectively and vertically fixed in the hole at bottom plate two ends, adopt electroplax
It is inserted in fuel gas air inlet pipe and fuel gas escaping pipe and is covered on bottom plate, according to integrated metal-graphite Composite Double
Pole plate, sealing gasket, membrane electrode, the order of integrated metal-graphite composite dual-electrode plates, by N pieces membrane electrode and N+1 pieces integration gold
Category-graphite composite bipolar plate is inserted in fuel gas air inlet pipe successively and fuel gas escaping pipe is stacked on and adopts on electroplax, Ran Hou
Upper end sets gradually adopts electroplax and upper head plate, then is fastened by screw rod, being assembled integrally metal-graphite composite dual-electrode plates fuel
The light-duty pile of battery.
Beneficial effects of the present invention are：
1. integrated metal-graphite composite dual-electrode plates of the invention cause graphite cake and metal corrugated plate, graphite cake and gas
There is lower contact resistance between body diffused layer；The thickness of graphite cake is big compared with the thickness of metal corrugated plate more than 5 times, is made up of it
The intensity of integrated graphite-metal bipolar plates significantly improve, be not only convenient to fill heap but also the mechanical strength of whole pile can have been improved
And anti-seismic performance；Graphite cake carries minitype gas flow field with the contact surface of membrane electrode, is conducive to gas diffusion uniform, and anode is difficult
Ponding, not only improves the overall output performance of pile, is more beneficial for the radiating of pile；Graphite cake and membrane electrode directly contact, compared with
Metal corrugated plate has more preferable decay resistance, and avoids H2Diffuse to the metallic hydrogen caused in the lattice of metal corrugated plate
It is crisp；Graphite cake is easier processing, low cost of manufacture compared with metal corrugated plate thinning；The ripple struction of graphite cake is by metal corrugated plate
Bellows chamber filling is full, improves the flatness of integrated metal-graphite composite dual-electrode plates, and the pile intensity being assembled into is higher and receives
Evenly, the uniformity of pile can be ensured preferably power.
2. using air as oxygen source, while used as cooling medium, metal corrugated plate need to only leave the single channel of air, make electricity
The more traditional pile of volume of heap reduces 1 times.
3. pile specific power of the invention can reach more than 1.2kW/kg, and the more traditional pile of performance lifts more than 1 times.
4. the durability of pile of the present invention reaches more than 20000h, and the more traditional pile of stability lifts more than 20 times.
5. because of doped negative temperature coefficient thermistor material, negative temperature coefficient heat-sensitive in the graphite cake material of pile of the present invention
Resistance material has resistance higher at low temperature, can realize cold start-up by self-heating, and when being reduced significantly cold start-up
Between, the cold start-up time is only 3s or so.Conventional bipolar plate is big because of resistance, it is impossible to applied at a temperature of more than 40 DEG C, and subzero temperature
Coefficient heat-sensitive resistance material resistance very little at high temperature is spent, graphite cake resistance is substantially reduced, can be in more than 60 DEG C higher temperatures
The lower normal use of degree.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery.
Fig. 2 is a kind of fractionation structural representation of the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery.
Fig. 3 is the schematic diagram of metal corrugated plate.
Fig. 4 is the micro flow channel schematic diagram of graphite cake.
Fig. 5 is the structural representation of graphite cake.
The schematic diagram of the integrated metal-graphite composite dual-electrode plates of Fig. 6.
Label declaration：1- screw rods；21- upper head plates；22- bottom plates；3- metal corrugated plates；4- membrane electrodes；5- sealing gaskets；6-
Graphite cake；61- graphite cake bodies；The graphite board corrugated structures of 62-；7- adopts electroplax；8- oxygen flow fields；9- hydrogen flow fields；10- is sealed
Groove；11- integration metal-graphite composite dual-electrode plates.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.It is emphasized that the description below
It is merely exemplary, rather than in order to limit the scope of the present invention and its application.
Fig. 1 show a kind of integrated light-duty pile of metal-graphite composite bipolar plate fuel battery of the present embodiment offer,
It is main to include that integrated metal-graphite composite dual-electrode plates 11, membrane electrode 4, sealing gasket 5, fuel gas supply line (do not show in figure
Go out), adopt electroplax 7, upper head plate 21, bottom plate 22 and for fasten screw rod 1.
As shown in fig. 6, the integrated metal-graphite composite dual-electrode plates 12 are by piece of metal corrugated plating 3 and piece of graphite
Plate 6 is constituted.Metal corrugated plate 3 is minus plate, and its structural representation is as shown in figure 3, sheet metal is made up of Sheet Metal Forming Technology
Corrugated obtains metal corrugated plate 3, its material may be selected from 316 stainless sheet steels, 316L stainless sheet steels, 304 stainless sheet steels,
349 stainless sheet steels, TA1 titaniums band, TA2 titaniums band, aluminium alloy sheet, nickel alloy thin plate, but this is not limited to, sheet metal thickness is
0.05~0.2mm.Raised keel chamber constitutes the oxygen flow field 8 of fuel cell on metal corrugated plate 3, and raised ridge is simultaneously
Take into account radiated rib.Graphite cake 6 is positive plate, and as shown in fig. 4-5, graphite cake 6 is by graphite cake body 61 for its structural representation
Constituted with graphite board corrugated structure 62.The thickness of graphite cake body 61 is 0.4~1mm, in a side surface of graphite cake body 61
It is that the diffusion of hydrogen and the discharge of the water of electrochemical reaction generation provide passage with hydrogen flow field 9, hydrogen flow field 9 can be
Parallel DC fields, serpentine flow, intertexture flow field or point-like flow field, the depth of hydrogen flow field 9 is 0.05~0.5mm；And in the side
The edge on surface is provided with seal groove 10.The opposite side of graphite cake body 61 is the graphite board corrugated knot coordinated with metal corrugated plate 3
Structure 62.Metal corrugated plate 3 need not be welded and Nian Jie with graphite cake 6, using metal corrugated plate 3 and hot pressing of Graphite Composite Powder
Shaping, forms the integrated metal-graphite composite dual-electrode plates 11 that metal corrugated plate 3 is closely bonded with graphite cake 6.Integrated gold
The once hot-forming of category-graphite composite bipolar plate 11 comprises the following steps：
1) side surface of sheet metal is carried out into special modification, is existed using technologies such as chemical plating, plating, PVD
Wavy metal plate surface covers one layer of good conductor of electricity as erosion shield, such as layer of precious metal, titanium nitride layer, titanium carbide layer or
Nickel based metal layer.
2) the one of surface-modified treatment faces down and sheet metal is placed on the lower mould with corrugated surface, uses 20MPa
Power by sheet metal pre-molding, obtain metal corrugated plate 3.
3) in terms of weight/mass percentage composition, by 68%~78% graphite substrate, 10%~20% binding agent, 5% increasing
Strong agent, 2% conductive filler and 5% negative temperature coefficient heat-sensitive resistance material (NTC) are sufficiently mixed, and obtain graphite composite powder
Body；The Graphite Composite Powder that will be mixed is inserted in lower mould, makes the bellows chamber filling of the upside of metal corrugated plate 3 full, and continue
Filling certain thickness, then covers the mold with micro flow channel, using compression-moulding methods heating pressurization one-shot forming, its
Middle molding temperature in 200 DEG C or so, molding pressure 35MPa, press time 1h, be obtained surface smoothness integrated metal high-
Graphite composite bipolar plate 12.The pile intensity of integrated metal-graphite composite dual-electrode plates 11 assembling prepared by the method is higher, and
Evenly, the uniformity of pile can be ensured preferably stress.Wherein, the graphite substrate can be selected from natural stone
Ink, Delanium, expanded graphite；The binding agent can be resin-bonded selected from phenolic resin, the fluoride-based resin of epoxy etc.
Agent；The reinforcing agent can be selected from CNT, carbon fiber；The conductive filler main purpose is to improve the electricity of graphite cake 6
Conductance, it can be selected from carbon black, metal powder；Described negative temperature coefficient heat-sensitive resistance material can be selected from Mn-Cu-X (X
=Zn, Bi2O3, Co, Ni) series thermistor, using negative temperature coefficient heat-sensitive resistance material there is resistance to be inversely proportional with temperature
Characteristic so that graphite cake 6 simultaneously substitute electrical heating elements, realize quick cold start-up, the time of cold start-up using self-heating
In 3s or so, the cold start-up that pile is solved the problems, such as while additional electrical heating elements are not needed is realized.And negative temperature system
The admixture of number thermistor material causes that the resistance of graphite cake 6 is quickly reduced with the rising of temperature so that pile can be 60
Normally used under higher temperature more than DEG C.
The membrane electrode 4 is to be furnished with Pt/C Catalytic Layers and many successively respectively in the both sides of perfluorinated sulfonic acid polymer dielectric film
The gas diffusion layers in hole, and it is provided with card-protecting film at the edge of polymer dielectric film.Gas is realized by porous gas diffusion layers
Be uniformly distributed and the faster transmission rate of body, the porous gas diffusion layers can be the graphitic carbon of high diffusivity coefficient feature
Paper.
Integrated metal-graphite composite dual-electrode plates 11 and membrane electrode 4 are stacked gradually, integrated metal-graphite Composite Double
The metal corrugated plate 3 of pole plate 11 and the negative electrode side contacts of membrane electrode 4, the corrugated surface of metal corrugated plate 3 provide gas for oxygen circulates
Body spreads flow field, while taking into account radiating；It is the unlimited sky with air insertion without sealing between metal corrugated plate 3 and membrane electrode 4
Between.Graphite cake 6 and the anode side contacts of membrane electrode 4, make hydrogen flow field 9 and the directly contact of membrane electrode 4, the marginal belt of graphite cake 6
There is seal groove 10, sealing gasket 5 is placed in seal groove 10, between membrane electrode 4 and graphite cake 6, prevent hydrogen gas leakage, make to carry
The electrochemical reaction confined space of hydrogen is formed between the graphite cake 6 and membrane electrode 4 of hydrogen flow field 9.In order to obtain output high
Power, can be combined according to integrated metal-graphite composite dual-electrode plates 11, sealing gasket 5, membrane electrode 4, integrated metal-graphite
Be stacked for N pieces membrane electrode and N+1 pieces integration metal-graphite composite dual-electrode plates by the order of bipolar plates 11, constitutes N piece films
The stacked body of electrode 4 and N+1 pieces integration metal-graphite bipolar plates 11, improves output voltage.Then distinguish at stacked body two ends
Electroplax 7 is adopted in setting, and sets upper head plate 21, bottom plate 22, then is assembled into novel all-in-one metal-graphite by the fastening of screw rod 1
The light-duty pile of composite bipolar plate fuel battery.The light-duty pile of the fuel cell have specific power high, small volume, intensity it is high, accelerate
Can normally be used under cold boot of fuel cell, higher temperature, high reliability, high-performance, the spy of high performance-price ratio such as long wearing
Point.
The present invention is further illustrated with specific embodiment below：
1) material of metal corrugated plate 3 is TA1, and TA1 titaniums tape thickness is 0.1mm.One side surface of TA1 titanium bands is carried out into spy
Different modification, distant metal level that a layer thickness is 1 μm is covered as erosion shield in TA1 titanium belt surfaces.
2) the one of surface-modified treatment faces down and TA1 titanium bands is placed on the lower mould with corrugated surface, with 20MPa's
Power is by TA1 titaniums with pre-molding.
3) in terms of weight/mass percentage composition, by 78% native graphite base material, 10% phenolic resin adhesive, 5% carbon
Fiber enhancer, 2% graphite powder conductive filler and 5% negative temperature coefficient heat-sensitive resistance material (Mn-Cu-Co) are fully mixed
Close, obtain Graphite Composite Powder；The Graphite Composite Powder that will be mixed is inserted in lower mould, makes the ripple on the upside of metal corrugated plate
Chamber filling is full, and continues to fill up certain thickness, then covers the mold with micro flow channel, is heated using compression-moulding methods
Pressurization one-shot forming, wherein molding temperature are obtained surface smoothness in 200 DEG C or so, molding pressure 35MPa, press time 1h
Integrated metal-graphite composite dual-electrode plates 11 high.Wherein, the thickness of graphite cake body 61 is 1mm, and hydrogen flow field 9 is parallel
DC fields, the depth of hydrogen flow field 9 is 0.4mm.
4) preparation of membrane electrode：Polymer dielectric film of the both sides with Catalytic Layer, gas are expanded by the method for hot pressing
Dissipate layer and card-protecting film encapsulates integral battery core；The temperature of the hot pressing is 101 DEG C, pressure 0.15MPa, time 20s.The shield card
Film can be to be covered with EVA adhesive linkages in the side of PET film, and card-protecting film thickness is 80 μm, and its Main Function is protection polymer
The marginal portion of dielectric film.
5) it is combined according to integrated metal-graphite composite dual-electrode plates 11, sealing gasket 5, membrane electrode 4, integrated metal-graphite
Be stacked for 45 membrane electrodes and 46 integrated metal-graphite composite dual-electrode plates by the order of bipolar plates 11, constitutes 45
Membrane electrode 4 and 46 stacked bodies of integrated metal-graphite bipolar plates 11, are then respectively provided with stacked body two ends and adopt electroplax 7,
And upper head plate 21, bottom plate 22 are set, then being assembled integrally metal-graphite composite dual-electrode plates fuel electricity is fastened by screw rod 1
The light-duty pile in pond.
Air cooling fuel cell based on the above-mentioned integrated light-duty pile of metal-graphite composite bipolar plate fuel battery is -20
The time of cold start-up is 2s at DEG C.Under 65 DEG C of operating temperature, pile specific power reaches more than 1.2kW/kg, pile it is durable
Property reach more than 20000h.
Claims (9)
1. the integrated metal-graphite light-duty pile of composite bipolar plate fuel battery, mainly including membrane electrode, bipolar plates, adopt electroplax,
End plate and fuel gas inlet and outlet piping, the membrane electrode be the both sides of polymer dielectric film be furnished with successively respectively Catalytic Layer and
Gas diffusion layers, it is characterised in that the bipolar plates are that the integrated metal-graphite that metal corrugated plate and graphite cake are constituted is combined
Bipolar plates, wherein metal corrugated plate are minus plate, and raised keel chamber is oxygen flow field on metal corrugated plate, and raised ridge is simultaneously
Take into account radiated rib；Graphite cake is positive plate, and it is that have hydrogen flow field in a side surface of graphite cake body, and in the side table
The edge in face is provided with seal groove, and the opposite side of graphite cake body is graphite board corrugated structure；Graphite cake passes through graphite board corrugated knot
Structure is embedded in metal corrugated plate and connects as one；
N+1 pieces integration metal-graphite composite dual-electrode plates and N piece membrane electrodes are stacked gradually, and are wherein set in the seal groove of graphite cake
There is sealing gasket, make to form the electrochemical reaction confined space of hydrogen between graphite cake and membrane electrode；Metal corrugated plate and membrane electrode
Between be open spaces with air insertion；
It is sequentially arranged respectively in the upper and lower both sides of stacked body and adopts electroplax and end plate, and fastening is connected by screw rod.
2. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 1, its feature exists
In the raw material composition of the graphite cake is calculated as with weight/mass percentage composition：68%~78% graphite substrate, 10%~20% it is viscous
Knot agent, 5% reinforcing agent, 2% conductive filler and 5% negative temperature coefficient heat-sensitive resistance material.
3. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 2, its feature exists
In the graphite substrate is selected from native graphite, Delanium, expanded graphite；The binding agent is selected from phenolic resin, epoxy fluorine second
Ene based resins；The reinforcing agent is selected from CNT, carbon fiber；The conductive filler is selected from carbon black, metal powder；Described subzero temperature
Degree coefficient heat-sensitive resistance material is using Mn-Cu-X serial thermistor.
4. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 1, its feature exists
In the thickness of the graphite cake body is 0.4~1mm.
5. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 1, its feature exists
In the discharge of the water that the hydrogen flow field is generated for the diffusion of hydrogen and electrochemical reaction provides passage, and hydrogen flow field is parallel
DC fields, serpentine flow, intertexture flow field or point-like flow field, the depth of hydrogen flow field is 0.05~0.5mm.
6. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 1, its feature exists
In the sheet metal thickness of the metal corrugated plate is 0.05~0.2mm.
7. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 1, its feature exists
In the surface that the metal corrugated plate is contacted with membrane electrode carries out good conductive and corrosion-resistant finishes using surface modification technologies
Treatment, specifically covers layer of precious metal, titanium nitride layer, titanium carbide layer or nickel based metal layer in wavy metal plate surface.
8. the integrated light-duty pile of metal-graphite composite bipolar plate fuel battery according to claim 1, its feature exists
In in the membrane electrode, card-protecting film being provided with the edge of polymer dielectric film.
9. the manufacture method of the integrated metal-graphite light-duty pile of composite bipolar plate fuel battery, it is characterised in that including as follows
Step：
1) preparation of integrated metal-graphite composite dual-electrode plates：
1. the side surface covering layer of precious metal of sheet metal, titanium nitride layer, titanium carbide layer or nickel based metal layer are carried out into surface
Good conductive and corrosion-resistant finishes modification；
2. the one of surface-modified treatment faces down and sheet metal is placed on the lower mould with corrugated surface, with the power of 20MPa
By sheet metal pre-molding；
3. in terms of weight/mass percentage composition, by 68%~78% graphite substrate, 10%~20% binding agent, 5% reinforcing agent,
2% conductive filler and 5% negative temperature coefficient heat-sensitive resistance material are sufficiently mixed and obtain Graphite Composite Powder, and graphite is combined
Powder is inserted in lower mould, the bellows chamber on the upside of metal corrugated plate is filled full, and continues to fill up certain thickness, then covers tool
There is the mold of micro flow channel, using compression-moulding methods heating pressurization one-shot forming, integration metal-graphite Composite Double is obtained
Pole plate；
2) preparation of membrane electrode：Both sides are carried by the method for hot pressing for polymer dielectric film, the gas diffusion layers of Catalytic Layer
Integral battery core is encapsulated with card-protecting film；
3) fuel gas air inlet pipe and fuel gas escaping pipe are respectively and vertically fixed in the hole at bottom plate two ends, are adopted electroplax and are inserted in
Fuel gas air inlet pipe and fuel gas escaping pipe are simultaneously covered on bottom plate, according to integrated metal-graphite composite dual-electrode plates,
Sealing gasket, membrane electrode, the order of integrated metal-graphite composite dual-electrode plates, by N pieces membrane electrode and N+1 pieces integration metal-stone
Black composite dual-electrode plates are inserted in fuel gas air inlet pipe successively and fuel gas escaping pipe is stacked on and adopts on electroplax, then upper end according to
Electroplax and upper head plate are adopted in secondary setting, then are fastened by screw rod, and being assembled integrally metal-graphite composite bipolar plate fuel battery is light
Type pile.
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