CN1238919C - Process for preparing fuel cell bipolar plate and composite material used thereof - Google Patents
Process for preparing fuel cell bipolar plate and composite material used thereof Download PDFInfo
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- CN1238919C CN1238919C CNB2003101129276A CN200310112927A CN1238919C CN 1238919 C CN1238919 C CN 1238919C CN B2003101129276 A CNB2003101129276 A CN B2003101129276A CN 200310112927 A CN200310112927 A CN 200310112927A CN 1238919 C CN1238919 C CN 1238919C
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Classifications
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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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Abstract
The present invention relates to technology for preparing a bipolar plate for a fuel battery and composite material used in the technology, which belongs to the technical field of proton exchanging membrane fuel batteries. The composite material of the present invention comprises 75 to 87 wt% of electricity conductive skeletal material and 13 to 25 wt% of adhesive agents and curing agents, wherein the electricity conductive skeletal material is formed by mixing natural flake graphite and artificial graphite in a certain proportion, vinyl resin modified by phenolic aldehyde or unsaturated P17-902 polyester resin is used as an adhesive agent, and methyl ethyl ketone peroxide or benzoyl peroxide is used as the curing agent. A small amount of fine powder of black carbon or natural graphite as an auxiliary component is added. A bipolar plate for a fuel battery is formed once by mold pressing at certain forming temperature and unde certain forming pressure. Compared with single graphite, the electric conductivity, bending strength, air permeability and other performance indexes of the prepared bipolar plate for a proton exchange membrane fuel battery are greatly enhanced, and the bipolar plate for a proton exchange membrane fuel battery has the advantages of simple preparing technology and low product cost.
Description
Technical field
The present invention relates to the composite material and the preparation technology thereof of a kind of manufacturing Proton Exchange Membrane Fuel Cells (PEMFC) bipolar plates, belong to the Proton Exchange Membrane Fuel Cells technical field.
Background technology
Fuel cell (FC) is a kind of chemical energy that will be stored in fuel and the oxidant is directly changed into electric energy by electrode reaction a device.Its maximum characteristics are because course of reaction does not relate to fossil fuel, so its energy conversion efficiency is not subjected to the restriction of " Carnot cycle ", the energy conversion efficiency height.Raymond George points out that the energy of Proton Exchange Membrane Fuel Cells changes rate up to 60%～80% in " fuel cell and development prospect thereof " literary composition, actual service efficiency then is 2 times [referring to International Power, 2001 (2): 24～26] of ordinary internal combustion engine.It also has the fuel variation in addition, environmental pollution is little, noise is low, reliability and maintainability are good, and therefore advantages such as cold-starting, no electrolyte leakage are acknowledged as the first-selected power supply that promises to be space flight, military affairs, electric automobile and regional power station most.
Bipolar plates is the vitals of Proton Exchange Membrane Fuel Cells, and also being influences battery performance, especially influences a key factor of power of battery density and manufacturing cost.In the PEMFC battery pack, requiring bipolar plate material is the good conductor (finishing the effect of collected current) of electricity and the good conductor (being beneficial to heat extraction) of heat, exist acid or alkali and oxidation and reducing medium owing in the operational environment of fuel cell simultaneously, so require bipolar plate material to have resistance to corrosion.In the running of PEMFC, need come transfer reaction gas with bipolar plates, and get rid of reaction product, therefore, also require bipolar plates that complicated runner is arranged.At present, fuel cell technology is quite ripe, be in business-like eve, because the cost of manufacture and the price higher (2000～3000dollars/Kw) of fuel cell, article [Per Ekdunge, Monika Raberg.The fuel cell vehicle analysis of energy use, Emissions and cost, Int.J Hydrigeb Ebergym 1998,23 (5): 381～385], cost of manufacture to fuel cell is assessed, and wherein the cost of manufacture of bipolar plates accounts for the 60%-70% of whole fuel cell, has become and has limited one of its business-like obstacle.
People such as HENTALL L P study the different materials that can be used for dual polar plates of proton exchange membrane fuel cell at [the 80th phase of J Power Sources] in 1999 " New materials for polymerelectrolyte membrane fuel cell current collectors " literary composition, and that these materials comprise is gold-plated, stainless steel, titanium and the flake graphite etc. of aluminium.Flake graphite is compared performance with standard graphite and is improved a lot, and cheap, be easy to machine work.But it is easy to collsion damage, and its compressibility has hindered its application in many battery pile.Gold-plated, aluminium sheet must guarantee the complete imporosity of coating as the bipolar plates of Proton Exchange Membrane Fuel Cells, to avoid the reaction of aluminium sheet and electrolyte solution.The titanium performance that scribbles nitride is similar to conventional graphite, and titanium is easier to preparation, and firm, and volume is little, the water-cooling apparatus of also can in plate, packing into simultaneously, but cost is higher.Gold-plated corrosion resistant plate performance is better than the conventional graphite plate, and more cheap than titanium, but its density is big, simultaneously because its passivated surface layer in conjunction with very stable under the temperature, therefore is difficult to carry out diffusion-bonded.Because the stainless steel relative cost is low, intensity is high, easily processing and moulding, fuel cell studies group of Birmingham, GBR university will its bipolar plate material as Proton Exchange Membrane Fuel Cells.
Aspect the bipolar plates development, fuel cell ERC of Dalian Chemical Physics institute has initiated the metal sheet modification and has prepared bipolar plates technology, compares with traditional graphite bi-polar plate, and cost descends, but cost of manufacture is still very high.
The bipolar plates of using single flexible graphite to make has good conductivity and thermal conductivity, has certain difficulty but how to improve its intensity by process means to satisfy instructions for use; Large scale thin type bipolar plates is added metal forming strengthen, under the less situation of thickness, the full surface that how to make the even clad metal paper tinsel of flexible graphite is technological difficulties.
The plain composite material double pole plate of resin-based charcoal is the developing direction of dual polar plates of proton exchange membrane fuel cell, the plain composite material dual polar plates of proton exchange membrane fuel cell of present resin-based charcoal, only use a kind of single native graphite or Delanium component to make the conduction aggregate, its conductivity and intensity are all lower.
Summary of the invention
At present the deficiencies in the prior art and defective, the purpose of this invention is to provide a kind of preparation technology of fuel battery double plates and used composite material thereof, preparation technology is simple, the proton fuel cell bipolar plates that makes, not only have higher conductivity, higher intensity and lower air penetrability, and cost is low, and runnability is stable under lower temperature.
Technical scheme of the present invention is as follows: a kind of composite material for preparing fuel battery double plates is characterized in that: it is 75%～87% conduction aggregate that this composite material contains weight ratio, and weight ratio is 13%～25% adhesive and curing agent; Described conduction aggregate adopts Delanium and two kinds of graphite of natural flake graphite to mix, and the weight ratio of natural flake graphite and Delanium is 0.8～1.50; Described adhesive adopts phenol aldehyde modified vinylite or unsaturated polyester resin P17-902 styrene solution, and the solid content of wherein phenol aldehyde modified vinylite or unsaturated polyester resin P17-902 is 60%～66%; Described curing agent adopts MEKP or benzoyl peroxide, and its content accounts for 1%～3% of vinylite phenol aldehyde modified in the adhesive or unsaturated polyester resin P17-902 weight content.
The preferred content of its conduction aggregate is 80%～84% in the composite material of preparation fuel battery double plates of the present invention; The preferred content of adhesive is 16%～20%, and the preferred content of curing agent addition is 1.5%～2%. of vinylite phenol aldehyde modified in the adhesive or a unsaturated polyester resin P17-902 weight resin content.
In the component of above-mentioned composite material, also contain carbon black or native graphite fine powder, its weight percent content greater than zero less than 4%.
The present invention also provides a kind of process that adopts above-mentioned Composite Preparation fuel battery double plates, it is characterized in that this method comprises the steps:
Step 1, be 0.8～1.50 evenly to be mixed and made into the conduction aggregate in the pot mixing to pinch by weight with natural flake graphite and Delanium;
Step 2, in the adhesive that accounts for composite material total weight 13%～25%, add 1%～3% curing agent of vinylite phenol aldehyde modified in the adhesive or unsaturated P17-902 alkyd resin weight content, mix the back adding and account in the conduction aggregate of composite material total weight 75%～87%, make raw mix;
Demoulding or outer demoulding carry out compression molding in step 3, the employing, and briquetting pressure is 6MPa～25MPa, and preferred briquetting pressure is 10MPa～20Mpa, 150 ℃～250 ℃ of forming temperatures, and preferred forming temperature is 160 ℃～180 ℃; Be 10-30 minute curing time.
In the process of the present invention, when demoulding carries out compression molding in adopting, should in the raw mix that step 2 is made, add inner pattern releasing agent applicable earlier, addition is 0.5～2% of vinylite phenol aldehyde modified in the adhesive or a unsaturated P17-902 alkyd resin weight content, takes the dish out of the pot after stirring 2～4 hours under 20～25 ℃ of conditions then.
The present invention uses natural flake graphite and two kinds of components of Delanium conduction aggregate as bipolar plates, styrene solution with phenol aldehyde modified vinylite or unsaturated P17-902 alkyd resin is an adhesive, with methyl ethyl ketone peroxide or benzoyl peroxide is curing agent, and adds a spot of helper component carbon black or native graphite fine powder; Under certain forming temperature and briquetting pressure, through the mold pressing one-shot forming, preparation technology is simple; Make dual polar plates of proton exchange membrane fuel cell, the more single graphite of every performance index is greatly improved.The dual polar plates of proton exchange membrane fuel cell that uses the present invention to make, have following feature: 1. volume conductance at normal temperatures is 110S/cm～500S/cm; 2. the rupture strength of bipolar plates is 25MPa～40MPa under the normal temperature; 3. the air transmission coefficient under the normal temperature is 10
-7Cm
2/ s; 4. the density of bipolar plates is 1.85g/cm under the room temperature
3～2.0g/cm
3
Embodiment
Below concrete enforcement of the present invention is further described.
The conduction aggregate: in composite material of the present invention, used conduction aggregate is the mixed powder of natural flake graphite and Delanium, can be the natural flake graphite and the Delanium in any source, and the granularity of natural flake graphite is generally-150 orders; The Delanium granularity is-250 orders; The proportioning of two kinds of graphite is in the composite material of bipolar plates: natural flake graphite: Delanium=0.8～1.50, and conduction aggregate consumption accounts for 87%～75% of composite material weight, and preferred value is 80%～84%.
Adhesive resin: adhesive resin not only plays the effect that other solid particle in the composite material is bonded together, also can have influence on the intensity of bipolar plates, also can influence conductivity and the bipolar plates stability in use and the process conditions of moulding of bipolar plates simultaneously.As the adhesive resin of bipolar plates, not only require to improve the conductivity of bipolar plates, to have suitable forming temperature and briquetting pressure simultaneously, have excellent acid, alkali resistance.Adopt by phenol aldehyde modified vinylite or unsaturated P17-902 alkyd resin, adhesive resin as composite material of the present invention, be made into solid content 60%～66% during use, viscosity is the solution of 210～230mpa.s, used solvent is for can dissolve employed phenol aldehyde modified vinylite or unsaturated polyester resin P17-902 and volatile organic solvent.Adhesive resin is phenol aldehyde modified vinylite preferably, with this resin dissolves in styrene, be made into solid content 60%～66%, viscosity is the solution of 210～230mpa.s.This adhesive also can directly be bought from DSM resin Co., Ltd (JDR), and the performance index behind the resin solidification are: density is 1.08g/cm
3Hot strength is 90MPa; Heat distortion temperature is 140 ℃; Vitrification point is 158 ℃, and this fluoropolymer resin has acid and alkali resistance preferably.Use for a long time under 100 ℃ of conditions, can not deform, it is highly stable to be with this resin that adhesive makes the performance of bipolar plates.Prepare the adhesive consumption of using in the bipolar plates composite material of the present invention and account for 25%～13% of composite material weight, be preferably 16%～20%.
Curing agent: in composite material of the present invention, described curing agent adopts benzoyl peroxide (BPO) or methyl ethyl ketone peroxide (MEKP).The curing agent addition be in the adhesive resin demand 1%～3%, 1.5%～2% of preferable amount.
Release agent: mainly contain four kinds of the alcoholic solution, zinc stearate, MOLDWININT-PUL24 of phenolic resins and XTEND 19W as release agent of the present invention.Preferred release agent is two kinds of liquid release agents, and is a kind of for being applied directly to the external release agent of the XTEND 19W type on the mould, generally is being higher than 25 ℃, is being lower than 250 ℃ of following film forming.When filming, at first oily thing, dust on the die surface are cleaned out, then mold heated is arrived operating temperature, with textile cloth release agent XTEND19W is coated on the mould, wipe unnecessary release agent, apply two-layer or two-layer above XTEND 19W again, dry, curing joins batch mixing then and carries out mold pressing in the film chamber.
Another kind of release agent is the inner pattern releasing agent applicable of MOLD WIN INT-PUL24, and this release agent adds when batch mixing.The advantage of this release agent is to improve production line efficiency when reducing pulling capacity, reducing the mould loss.It can reduce the viscosity of resin, improves the wetability of resin to mould, improves resin flow, can keep or improve simultaneously the physical property of bipolar plates.The consumption of inner pattern releasing agent applicable generally accounts for 0.5%～2% of adhesive resin content.
Above-mentioned these two kinds of release agents can directly be bought from Lars composite material Co., Ltd of Beijing section.
Helper component: in composite material provided by the invention, also can add 0～4% helper component such as carbon black or the native graphite fine powder that account for composite material weight, can further improve the conductivity and the intensity of bipolar plates.
The preparation of bipolar plates: make bipolar plates with composite material provided by the invention and can utilize the method for any manufacturing resinous substrates proton exchange film fuel cell to prepare basically.The invention provides a kind of die pressing of utilizing and prepare bipolar plates, demoulding and outer demoulding were two kinds in this method comprised, the process conditions of moulding: forming temperature is 150 ℃～250 ℃, and preferred forming temperature scope is 160 ℃～180 ℃; Briquetting pressure is 6MPa～25MPa, and preferred pressure range is 10MPa～20MPa; Be 10～30min curing time.
(a) adopt in demoulding: with natural flake graphite/Delanium with 0.8～1.50 ratio mix pinch in the pot evenly mixing after, the adhesive of adding 13%～25%, add curing agent again, the curing agent addition be in the adhesive resin content 1%～3%, if use inner pattern releasing agent applicable, can add inner pattern releasing agent applicable this moment, release agent is MOLD WIN INT-PUL24, addition be in the adhesive resin content 0.5～2%, after stirring 2 hours～4 hours under 20～25 ℃ of (room temperature) conditions, take the dish out of the pot, can carry out mold pressing.The material that mixes is poured in the die cavity, briquetting pressure is that (preferred pressure range is 10MPa～20Mpa) to 6MPa～25Mpa, after forming temperature is 150 ℃～250 ℃ (preferred forming temperature scope are 160 ℃～180 ℃), cooling after the insulation, pressurize 10-30 minute, release, depanning.
(b) adopt outer demoulding: if use external release agent, release agent adopts XTEND 19W during mold pressing.Should be at first with mold heated to 80～140 ℃, occupy external release agent with cotton and be coated on the clean die surface, apply one deck after the drying again and get final product.At least be coated with two-layer, dried/cured.Briquetting pressure is added to 6MPa～25MPa, after forming temperature is 150 ℃～250 ℃, and cooling behind insulation, the pressurize 10-30min, release, depanning.
Embodiment 1:
Material weight %
Delanium (one 250 orders, conduction aggregate) 41.7
Native graphite (150 orders, conduction aggregate) 33.3
Unsaturated P17-902 alkyd resin (adhesive) 25
Curing agent 2 (accounting for resin content)
Inner pattern releasing agent applicable 2 (accounting for resin content)
Briquetting pressure: 6MPa
Forming temperature: 150 ℃
Curing time: 30 minutes
Performance is as follows:
Density: 1.84g/cm3 conductivity: 120S/cm rupture strength: 41MPa
Embodiment 2:
Material weight %
Delanium (250 orders, conduction aggregate) 32
Native graphite (150 orders, conduction aggregate) 48
Carbon black 2
Unsaturated P17-902 alkyd resin (adhesive) 20
Curing agent 2 (accounting for resin content)
Inner pattern releasing agent applicable 1 (accounting for resin content)
Briquetting pressure: 20MPa
Forming temperature: 200 ℃
Curing time: 10 minutes
The bipolar plates performance is as follows:
Density: 1.88g/cm
3Conductivity: 195S/cm rupture strength: 32MPa
Embodiment 3:
Material weight %
Delanium (250 orders, conduction aggregate) 39.4
Native graphite (150 orders, conduction aggregate) 42.6
Native graphite fine powder 2
Unsaturated P17-902 alkyd resin (adhesive) 16
Curing agent 2 (accounting for resin content)
Inner pattern releasing agent applicable 0.5 (accounting for resin content)
Briquetting pressure: 25MPa
Forming temperature: 250 ℃
Curing time: 10 minutes
The bipolar plates performance is as follows:
Density: 1.82g/cm
3Conductivity: 240S/cm rupture strength: 28.2MPa
Embodiment 4:
Material weight %
Delanium (250 orders, conduction aggregate) 35.5
Native graphite (150 orders, conduction aggregate) 39.5
Benzoyl peroxide (BPO) 2% (accounting for resin content)
Phenol aldehyde modified vinylite (adhesive) 25
Release agent (being coated with outward)
Briquetting pressure: 20MPa
Forming temperature: 160 ℃
Curing time: 20 minutes
The bipolar plates performance is as follows:
Density: 1.95g/cm
3Conductivity: 195S/cm rupture strength: 38MPa
Embodiment 5:
Material weight %
Delanium (250 orders, conduction aggregate) 39.5
Native graphite (150 orders, conduction aggregate) 45.5
Methyl ethyl ketone peroxide (MEKP) 2 (resin content)
Phenol aldehyde modified vinylite (adhesive) 15
Release agent (being coated with outward)
Briquetting pressure: 20MPa
Forming temperature: 180 ℃
Curing time: 25 minutes
The bipolar plates performance is as follows:
Density: 1.98g/cm
3Conductivity: 430S/cm rupture strength: 33MPa
Embodiment 6:
Material weight, %
Delanium (250 orders, conduction aggregate) 41.5
Native graphite (150 orders, conduction aggregate) 45.5
Benzoyl peroxide (BPO) 2% (accounting for resin content)
Phenol aldehyde modified vinylite (adhesive) 13
Release agent is coated with outward
Briquetting pressure: 10MPa
Forming temperature: 200 ℃
Curing time: 25 minutes
The bipolar plates performance is as follows:
Density: 1.98g/cm
3Conductivity: 491S/cm rupture strength: 31Mpa
Claims (8)
1. composite material for preparing fuel battery double plates is characterized in that: it is 75%～87% conduction aggregate that this composite material contains weight ratio, and weight ratio is 13%～25% adhesive and curing agent; Described conduction aggregate adopts Delanium and two kinds of graphite of natural flake graphite to mix, and the weight ratio of natural flake graphite and Delanium is 0.8～1.50; Described adhesive adopts phenol aldehyde modified vinylite or unsaturated polyester resin P17-902 styrene solution, and the solid content of wherein phenol aldehyde modified vinylite or unsaturated polyester resin P17-902 resin is 60%～66%; Described curing agent adopts MEKP or benzoyl peroxide, and its content accounts for 1%～3% of vinylite phenol aldehyde modified in the adhesive or unsaturated polyester resin P17-902 weight resin content.
2. according to the described composite material of claim 1, it is characterized in that: this composite material also contains carbon black or native graphite fine powder, its weight percent content greater than zero less than 4%.
3. according to claim 1 or 2 described composite materials, it is characterized in that: the weight content of described conduction aggregate is 80%～84%; The weight content of adhesive is 16%～20%, and the curing agent addition is 1.5%～2% of vinylite phenol aldehyde modified in the adhesive or a unsaturated polyester resin P17-902 weight resin content.
4 according to the described composite material of claim 1, it is characterized in that: the granularity of described natural flake graphite is-150 orders, and the Delanium granularity is-250 orders.
5. a process that adopts Composite Preparation fuel battery double plates as claimed in claim 1 is characterized in that this method comprises the steps:
Step 1, be 0.8～1.50 evenly to be mixed and made into the conduction aggregate in the pot mixing to pinch by weight with natural flake graphite and Delanium;
Step 2, in the adhesive that accounts for composite material total weight 13%～25%, 1%～3% the curing agent that adds vinylite phenol aldehyde modified in the adhesive or unsaturated P17-902 alkyd resin weight content, mix the back adding and account in the conduction aggregate of composite material total weight 75%～87%, make raw mix;
Demoulding or outer demoulding carry out compression molding in step 3, the employing, and briquetting pressure is 6MPa～25MPa, 150 ℃～250 ℃ of forming temperatures, and be 10-30 minute curing time.
6. according to the described process of claim 5, it is characterized in that: in step 3, adopting during demoulding, earlier in the raw mix that step 2 is made, add inner pattern releasing agent applicable, addition be in the adhesive vinylite weight content 0.5～2%, after stirring 2～4 hours under 20～25 ℃ of conditions, take the dish out of the pot then.
7. according to claim 5 or 6 described processes, it is characterized in that: the briquetting pressure described in the step 3 is 10MPa～20Mpa, and forming temperature is 160 ℃～180 ℃.
8. according to the described process of claim 7, it is characterized in that: remover adopts MOLD WININT-PUL24 type inner pattern releasing agent applicable in described; External release agent adopts the ethanolic solution or the XTEND 19W of phenolic resins.
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| CNB2003101129276A CN1238919C (en) | 2003-12-26 | 2003-12-26 | Process for preparing fuel cell bipolar plate and composite material used thereof |
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| CN1238919C true CN1238919C (en) | 2006-01-25 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305154C (en) * | 2005-03-18 | 2007-03-14 | 清华大学 | Method for preparing bipolar plate of fuel cell by using thermoplastic resin as adhesive |
| CN1316656C (en) * | 2005-04-18 | 2007-05-16 | 浙江大学 | Preparing method for composite two-pole plate for proton exchange film fuel cell |
| CN100423925C (en) * | 2005-11-11 | 2008-10-08 | 浙江大学 | Preparation method of macromolecule resin composite bipolar plate for ion exchange membrane fuel battery |
| CN102569828A (en) * | 2010-12-22 | 2012-07-11 | 清华大学 | Microcrystal graphite compound for double-pole plate of fuel cell and preparation method of microcrystal graphite compound |
| CN109935850A (en) * | 2017-12-18 | 2019-06-25 | 洁星环保科技投资（上海）有限公司 | For the bipolar plates and composite material of fuel cell pile, process of preparing |
| CN108808037A (en) * | 2018-06-12 | 2018-11-13 | 江苏墨泰新材料有限公司 | Fuel battery double plates, fuel cell, fuel battery engines and electric vehicle |
| CN109244501B (en) * | 2018-09-25 | 2021-03-26 | 德州新动能铁塔发电有限公司 | Fuel cell bipolar plate composite material and preparation method and application thereof |
| CN109713320A (en) * | 2018-12-29 | 2019-05-03 | 绍兴金创意塑化电器有限公司 | A kind of battery pole plates BMC material and preparation method thereof |
| CN111916782B (en) * | 2020-06-29 | 2021-12-14 | 青岛杜科新材料有限公司 | Ultrathin graphite composite bipolar plate base material capable of being rapidly cold-pressed and formed and preparation method thereof |
| CN116072905B (en) * | 2021-12-06 | 2023-06-27 | 北京华胜信安电子科技发展有限公司 | Composite material, composite graphite bipolar plate, fuel cell and preparation method |
| CN114784307B (en) * | 2022-03-29 | 2023-11-17 | 广东氢发新材料科技有限公司 | Graphene reinforced expanded graphite/polyimide-polyether-ether-ketone composite bipolar plate and preparation method thereof |
| CN114678555A (en) * | 2022-04-08 | 2022-06-28 | 国网智能电网研究院有限公司 | Graphite bipolar plate with multi-scale microstructure and preparation method and application thereof |
| CN114824344B (en) * | 2022-04-18 | 2024-01-19 | 冠驰新能科技(南京)有限公司 | Graphite-resin composite bipolar plate and preparation method and application thereof |
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