CN109950569A - A kind of molding preparation method of fuel battery double plates - Google Patents
A kind of molding preparation method of fuel battery double plates Download PDFInfo
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- CN109950569A CN109950569A CN201910257160.7A CN201910257160A CN109950569A CN 109950569 A CN109950569 A CN 109950569A CN 201910257160 A CN201910257160 A CN 201910257160A CN 109950569 A CN109950569 A CN 109950569A
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- bipolar plates
- plates
- fuel battery
- expanded graphite
- graphite
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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
Abstract
The invention discloses a kind of molding preparation methods for the fuel battery double plates for belonging to fuel cell components manufacture technology field.The following steps are included: selecting expanded graphite, the mold internal pressure that equal pressing equipment is placed in expanded graphite progress Shape correction, by the expanded graphite after shaping is made and has bipolar plates, impregnating resin, rinsing, water cure or the baking and curing in flow field, obtains bipolar plates.The present invention improves the uniformity in bipolar plates gap and the homogeneity of moulded board density after molding, and for density uniformity within ± 1%, bipolar plates are most thin to arrive 0.5mm.And then improve the uniformity of bipolar plates different zones resistance；Meanwhile room temperature isostatic pressing does not need additional release agent for bipolar plates, and molding time is short, is suitble to produce in enormous quantities.
Description
Technical field
The invention belongs to fuel cell components manufacture technology field, in particular to a kind of molding of fuel battery double plates
Preparation method.
Background technique
Fuel cell is a kind of energy conversion device, the chemistry that will be stored in fuel and oxidant according to electrochemical principle
It can be converted into electric energy, the advantage for having generating efficiency high, low in the pollution of the environment has a wide range of applications.Wherein, bipolar
Core component one of of the plate as fuel cell, main function are to separate reaction gas and import reaction gas by flow field to fire
Material battery, collection simultaneously conduct electric current and support membrane electrode, while also undertaking heat dissipation and the drain function of entire fuel cell.
Currently, bipolar plates used in fuel cell mainly include graphite, metal and composite material three classes.
Graphite is the bipolar plate material developed earliest, and graphite bi-polar plate has good corrosion resistance, with carbon fiber diffusion layer
Between have the advantages that good affinity, can satisfy the requirement that fuel cell is run steadily in the long term, be current proton exchange membrane
Most commonly used material in fuel cell studies and application.But the porosity of graphite is big, mechanical strength is lower, brittleness is big, is
Prevention working gas seeped bipolar plates, and met the design of mechanical property, and graphite bi-polar plate is usually thicker, lead to graphite material
Volume and quality it is larger.In addition, graphite plate is using tradition machining, technique is cumbersome, high expensive, is unfavorable for producing in batches.
Compared with graphite plate, metal (aluminium, titanium, nickel, stainless steel) and its alloy (aluminium alloy, titanium alloy etc.) are although bipolar plates
The brittleness of graphite plate is overcome, it is suitable for mass production but mainly anticorrosive poor, big with electrode diffusion layer contact resistance, it is necessary to
By surface treatment, cost increase is caused.Japanese research makees substrate with Titanium, by gas phase deposition technology in Titanium
The surface of plate covers one layer of carbon membrane, and due to complex process, carbon membrane and metal surface binding force are weak, cause carbon membrane easily from Titanium
Surface falls off, and performance and cost still do not obtain big improvement.It is placed in polymer and the intermediate of graphite or Carbon Black Composites
Composite dual-electrode plates, which are made, also in metal plate can also improve one effective way of corrosion resistance of metal material bipolar plates, but technique is multiple
It is miscellaneous.
Composite dual-electrode plates mainly include two major classes: carbon-based polymer composite material and metal-base composites.It is combined
The two-fold advantage of metal double polar plates and graphite bi-polar plate has the characteristics that corrosion-resistant, easily molded, small in size, intensity is high, represents double
The developing direction in pole plate future.As the SGL Graphite Company of Germany releases a variety of composite material double pole plate such as SGL001；Japanese Wu Yu
The patent that chemical industry Co., Ltd. announces, using resin for adhesive, carbon black is that conductive aggregate is prepared by injection molding
Composite material double pole plate.
Based on difficult point on some key indexes of current graphite plate and metal plate and industrialization cost control difficult point etc.
Factor, it can be seen that composite graphite bipolar plates are that one of current pile and bipolar plates industrialization compares rationality, actual choosing
Routing line.
From the point of view of patented technology, a large amount of patents are all applied for both at home and abroad, mainly including pure carbon materials and with carbon
For the composite material of matrix.In terms of pure carbon materials, someone carries out further modification to impermeable graphite, useful pure soft
Property graphite manufacture, it is useful difference graphite gradings of aggregates manufacture.In addition, some answering using graphite as matrix have also been developed at present
Condensation material, including adding the composite material as reinforced phase such as metal, fiber in graphite.
The country, using mould pressing technology, the patent for once preparing the fuel battery double plates with complex flowfield is few.With
Graphite (including artificial graphite, natural flake graphite, micro crystal graphite, expanded graphite) is conductive aggregate, and thermosetting property or thermoplasticity are
Adhesive is added other auxiliary packings according to performance requirement and makes bipolar plates.If patent [is adhesive using thermoplastic resin
Prepare the method ZL2005 10011441.2 of fuel battery double plates] use thermoplastic resin for adhesive, natural graphite powder,
Graphous graphite powder or the mixed powder of two kinds of components do conductive aggregate, are in temperature by adhesive of thermoplastic acrylic resin
Molding one-pass molding is prepared big greater than 200S/cm, flexural strength with complex flowfield, conductivity under conditions of 130-140 DEG C
In the composite material double pole plate of 20MPa.And patent [the preparation of composite material dual polar plates of proton exchange membrane fuel cell
ZL200310112927.6] then use modified thermosetting phenolic resin for adhesive, natural flake graphite is conductive aggregate, pressure
Function admirable is produced, the bipolar plates with complex flowfield.A kind of patent [soft graphite bipolar plates and preparation method thereof
200410008461.X] use expanded graphite for conductive aggregate, the bipolar plates performance that a certain amount of adhesive production is added meets
The requirement of 200W fuel cell pack.
The patent of foreign countries, molding production bipolar plates is also and few.Patent [US4214969Low cost bipolar
Current collector-separator for electrochemical cells] used by material substantially with it is above-mentioned
Patent is essentially identical, patent [US 6248467Composite bipolar plate for electrochemical
Cells] using resin and graphite as main material, the bipolar of the additives such as initiator, release agent molding production is added in molding
Plate benging intensity is 30MPa, and conductivity is higher than 200S/cm, density 1.66g/cm3。
In terms of the situation disclosed by the patent both domestic and external, the composite dual-electrode plates based on graphite-based, generally have powder molding and
Two kinds of technology paths of plate moulding.The technology path of general powder molding are as follows: preheated mold is added in mixed powder, using poly-
The melting temperature and certain pressure of object are closed, so that powder flows in a mold and full of entire an actor's rendering of an operatic tune, obtains Composite Double after solidification
Pole plate.If binder is thermosetting plastics, generally only need a few minutes that can solidify demoulding；If binder used is heat
Mold can be then cooled to binder fusing point temperature below, then could demoulded by thermoplastic plastic.Its shortcoming is that the production cycle
It is longer, it manufactures one piece of bipolar plates and needs 15~20min, and the moulded board that the technique prepares is thicker, most thin thickness is more than
2mm promotes for pile specific power the thickness for reducing bipolar plates with this, acts on limited.It is general to be molded for plate moulding
Object be prefabricated expanded graphite plate, expanded graphite generally passes through intercalation, washing, drying, high temperature by natural flake graphite
Extruding is prepared, and has loose and porous structure, but simultaneously, expanded graphite granularity is uneven, in irregular shape, corner angle are sharp
It is sharp, after molding, there can be the biggish flaw of localized voids, although there is the presence of gum dipping process, this non-uniform impregnation, one
Aspect influences the air-tightness of bipolar plates, on the other hand also brings much to the zone resistance of bipolar plates and prolonged reliability
It is uncertain.In addition, conventional forming technique is generally used, for example punching press or rolling techniques about the molding of composite plate at present,
The bipolar plates that this conventional technique prepares, density homogeneity, plate construction in terms of have very big defect.
Summary of the invention
The purpose of the present invention is to propose to a kind of molding preparation methods of fuel battery double plates, which is characterized in that including with
Lower step:
1) using expanded graphite as substrate, Shape correction, training time 2-15min, warp are carried out to it using graphite trimmer
Expanded graphite after shaping, major diameter reduce 40%-50%；
2) expanded graphite after shaping is placed in the mold of equal pressing equipment, under room temperature, in 0.5-5min, completes compacting
Process obtains the bipolar plates with flow field；
3) bipolar plates suppressed are taken out, and are placed it in gumming device, glue used is polyimide resin, acrylic acid
Resin, phenolic resin or epoxy resin, impregnation environment are room temperature in vacuo environment, and the impregnation time is 3-12h；
4) bipolar plates after impregnation are taken out, then it is rinsed；Generally use deionized water or special purpose detergent.
5) bipolar plates after impregnation and rinsing are subjected to curing process, general there are two types of curing modes.90 DEG C or so go
1-3h is toasted in boiling 1-2h or 120 DEG C or so of baking oven in ionized water.After the completion of solidification to get arrive final proper fuel
Cell bipolar plate.
The pressure range of the equal static pressure of the step 2) is between 50-250MPa.
The impregnation environment is that room temperature in vacuo environment vacuumizes 2-3 times gumming device repeatedly, guarantees immersing glue process
Vacuum degree is less than 1 atmospheric pressure.
The bipolar plates rinsing of the step 4) uses deionized water or special epoxy resin detergent.
The bipolar plates that the step 5) obtains, for the equal property of density within ± 1%, bipolar plates are most thin to reach 0.5mm.
The beneficial effects of the invention are as follows suppressing shaped expanded graphite using equal pressing equipment, the bipolar plates prepared
It has the special feature that:
1) Shape correction is carried out to expanded graphite, reduces the inhomogeneities of expanded graphite, improve bipolar plates after molding
The uniformity in gap, bipolar plates are most thin to arrive 0.5mm.And then improve the uniformity of bipolar plates different zones resistance；
2) bipolar plates are suppressed using equal pressing equipment, greatly improve the homogeneity of moulded board density, the equal property of density ±
Within 1%, meanwhile, room temperature isostatic pressing does not need additional release agent for bipolar plates, and molding time is short, is suitble to high-volume
Production.
Detailed description of the invention
Fig. 1 is to suppress bipolar plate flow sheet.
Specific embodiment
The present invention proposes a kind of molding preparation method of fuel battery double plates, with reference to the accompanying drawings and examples to this hair
It is bright to be further described.
Fig. 1 show the bipolar plate flow sheet of compacting.As shown in the figure the following steps are included: selecting expanded graphite, to expansion stone
Ink progress Shape correction, the mold internal pressure that the expanded graphite after shaping is placed in equal pressing equipment are made bipolar with flow field
Plate, impregnating resin, rinsing, water cure or baking and curing obtain bipolar plates.Specifically enumerate embodiment explanation.
Embodiment 1
1) 2000g expanded graphite is taken, carries out Shape correction to it using graphite trimmer, training time 10min is shaped
Expanded graphite afterwards, major diameter reduce 40% or so；
2) expanded graphite after taking 150g shaping is placed in the mold of equal pressing equipment, in 200MPa pressure and normal temperature environment
Under, suppression process is completed in 2min, obtains the bipolar plates that 0.9mm thicker strip has flow field；
3) bipolar plates suppressed are taken out, and are placed it in gumming device, then, which is vacuumized, it
Injecting a certain amount of polyimide resin inside afterwards, resin is totally submerged bipolar plates, with this condition, impregnation 12h.It crosses herein
Cheng Zhong is vacuumized 2-3 times repeatedly, guarantees the vacuum degree of immersing glue process less than 1 atmospheric pressure.
4) bipolar plates after impregnation are taken out, then it is rinsed with special epoxy resin cleaning agent；
5) bipolar plates after impregnation and rinsing are placed in 120 DEG C or so of baking oven and toast 3h, taken out, obtain final qualification
Fuel battery double plates.
Embodiment 2
1) 1000g expanded graphite is taken, carries out Shape correction to it using graphite trimmer, training time 5min is shaped
Expanded graphite afterwards, major diameter reduce 40% or so.
2) expanded graphite after taking 100g shaping is placed in the mold of equal pressing equipment, in 100MPa pressure and normal temperature environment
Under, in 1min, suppression process is completed, the bipolar plates that 0.6mm thicker strip has flow field are obtained.
3) bipolar plates suppressed are taken out, and are placed it in gumming device, then, which is vacuumized, it
Injecting a certain amount of acrylic resin inside afterwards, resin is totally submerged bipolar plates, with this condition, impregnation 8h.In this process
In, it vacuumizes 2-3 times repeatedly, guarantees the vacuum degree of immersing glue process less than 1 atmospheric pressure.
4) bipolar plates after impregnation are taken out, then it is rinsed with deionized water.
5) bipolar plates after impregnation and rinsing are placed in boiling 1h in 90 DEG C or so of deionized water, are completed after taking-up solid
Change, obtains final proper fuel cell bipolar plate.
Claims (5)
1. a kind of molding preparation method of fuel battery double plates, which comprises the following steps:
1) using expanded graphite as substrate, Shape correction is carried out to it using graphite trimmer, and training time 2-15min is shaped
Expanded graphite afterwards, major diameter reduce 40%-50%；
2) expanded graphite after shaping is placed in the mold of equal pressing equipment, under room temperature, in 0.5-5min, completes presser
Sequence obtains the bipolar plates with flow field；
3) bipolar plates suppressed are taken out, and are placed it in gumming device, glue used is polyimide resin, acrylic acid tree
Rouge, phenolic resin or epoxy resin, impregnation environment are room temperature in vacuo environment, and the impregnation time is 3-12h；
4) bipolar plates after impregnation are taken out, then it is rinsed；Using deionized water or special purpose detergent；
5) bipolar plates after impregnation and rinsing are subjected to curing process, general there are two types of curing mode, 90 DEG C or so of deionizations
1-3h is toasted in boiling 1-2h or 120 DEG C or so of baking oven in water, arrives final proper fuel battery after the completion of solidification
Bipolar plates.
2. the molding preparation method of a kind of fuel battery double plates according to claim 1, which is characterized in that the step 2)
Equal static pressure pressure range between 50-250MPa.
3. the molding preparation method of a kind of fuel battery double plates according to claim 1, which is characterized in that the impregnation ring
Border is that room temperature in vacuo environment vacuumizes 2-3 times gumming device repeatedly, guarantees the vacuum degree of immersing glue process less than 1 atmospheric pressure.
4. the molding preparation method of a kind of fuel battery double plates according to claim 1, which is characterized in that the step 4)
Bipolar plates rinsing use deionized water or special epoxy resin detergent.
5. the molding preparation method of a kind of fuel battery double plates according to claim 1, which is characterized in that the step 5)
Obtained bipolar plates, for the equal property of density within ± 1%, bipolar plates are most thin to reach 0.5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910257160.7A CN109950569B (en) | 2019-04-01 | 2019-04-01 | Die pressing preparation method of fuel cell bipolar plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910257160.7A CN109950569B (en) | 2019-04-01 | 2019-04-01 | Die pressing preparation method of fuel cell bipolar plate |
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| CN109950569B CN109950569B (en) | 2021-01-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323467A (en) * | 2019-07-09 | 2019-10-11 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | A kind of closed pore enhancing processing system for fuel cell graphite pole |
| CN110690472A (en) * | 2019-09-20 | 2020-01-14 | 一汽解放汽车有限公司 | Composite bipolar plate and preparation method and application thereof |
| CN112563528A (en) * | 2020-12-15 | 2021-03-26 | 广东国鸿氢能科技有限公司 | Preparation method of compression molding bipolar plate |
| CN112590263A (en) * | 2020-12-15 | 2021-04-02 | 广东国鸿氢能科技有限公司 | Preparation method of air-cooled compression molding graphite bipolar plate |
| CN113320194A (en) * | 2021-06-28 | 2021-08-31 | 一汽解放汽车有限公司 | Composite bipolar plate and preparation method thereof |
| CN113571726A (en) * | 2021-08-04 | 2021-10-29 | 广东省武理工氢能产业技术研究院 | High-conductivity composite bipolar plate and preparation method and application thereof |
| CN113659165A (en) * | 2021-08-05 | 2021-11-16 | 苏州摩尔新材料科技有限公司 | Carbon-based composite conductive slurry, graphite plate and preparation method of graphite plate |
| WO2024045697A1 (en) * | 2022-09-02 | 2024-03-07 | 上海神力科技有限公司 | Method for impregnating flexible graphite electrode plate of fuel cell |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323467A (en) * | 2019-07-09 | 2019-10-11 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | A kind of closed pore enhancing processing system for fuel cell graphite pole |
| CN110690472A (en) * | 2019-09-20 | 2020-01-14 | 一汽解放汽车有限公司 | Composite bipolar plate and preparation method and application thereof |
| CN112563528A (en) * | 2020-12-15 | 2021-03-26 | 广东国鸿氢能科技有限公司 | Preparation method of compression molding bipolar plate |
| CN112590263A (en) * | 2020-12-15 | 2021-04-02 | 广东国鸿氢能科技有限公司 | Preparation method of air-cooled compression molding graphite bipolar plate |
| CN113320194A (en) * | 2021-06-28 | 2021-08-31 | 一汽解放汽车有限公司 | Composite bipolar plate and preparation method thereof |
| CN113571726A (en) * | 2021-08-04 | 2021-10-29 | 广东省武理工氢能产业技术研究院 | High-conductivity composite bipolar plate and preparation method and application thereof |
| CN113659165A (en) * | 2021-08-05 | 2021-11-16 | 苏州摩尔新材料科技有限公司 | Carbon-based composite conductive slurry, graphite plate and preparation method of graphite plate |
| WO2024045697A1 (en) * | 2022-09-02 | 2024-03-07 | 上海神力科技有限公司 | Method for impregnating flexible graphite electrode plate of fuel cell |
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