CN114853929A - Bipolar plate resin composition, preparation method, bipolar plate, fuel cell and vehicle - Google Patents

Bipolar plate resin composition, preparation method, bipolar plate, fuel cell and vehicle Download PDF

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Publication number
CN114853929A
CN114853929A CN202110146862.5A CN202110146862A CN114853929A CN 114853929 A CN114853929 A CN 114853929A CN 202110146862 A CN202110146862 A CN 202110146862A CN 114853929 A CN114853929 A CN 114853929A
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CN
China
Prior art keywords
bipolar plate
resin
resin composition
fuel cell
vinyl resin
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Pending
Application number
CN202110146862.5A
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Chinese (zh)
Inventor
刘超凡
张金见
张小磊
甘全全
戴威
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Shanghai Shenli Technology Co Ltd
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Shanghai Shenli Technology Co Ltd
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Priority to CN202110146862.5A priority Critical patent/CN114853929A/en
Publication of CN114853929A publication Critical patent/CN114853929A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/02Ethene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00Electric propulsion with power supplied within the vehicle
    • B60L50/50Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/70Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
    • B60L50/72Constructional details of fuel cells specially adapted for electric vehicles
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/04Monomers containing three or four carbon atoms
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/02Details
    • H01M8/0202Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204Non-porous and characterised by the material
    • H01M8/0221Organic resins; Organic polymers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

The invention relates to the technical field of fuel cells, in particular to a bipolar plate resin composition, a preparation method, a bipolar plate, a fuel cell and a vehicle, wherein the bipolar plate resin composition comprises 3-30% of vinyl resin, 70-97% of styrene and 0.1-1% of an inducer; the bending strength of the bipolar plate obtained by the bipolar plate resin composition and the expanded graphite plate can reach 50MPa, the compressive strength can reach 80MPa, and the mechanical property of the expanded graphite plate is greatly improved; styrene is selected as a viscosity regulator of the vinyl resin, so that the viscosity of the resin can be regulated to 15mPa.s, and the resin is greatly suitable for graphite impregnation; the vinyl resin has the advantages of excellent bending strength and compressive strength, high temperature resistance and good corrosion resistance.

Description

Bipolar plate resin composition, preparation method, bipolar plate, fuel cell and vehicle
Technical Field
The invention relates to the technical field of fuel cells, in particular to a bipolar plate resin composition, a preparation method, a bipolar plate, a fuel cell and a vehicle.
Background
The fuel cell efficiently converts chemical energy stored in fuel (such as hydrogen, methanol and the like) into electric energy, and is a carbon-emission-free and environment-friendly power generation mode. The power generation principle is that electrochemical reaction occurs in the fuel cell, which divides an oxidation-reduction reaction into two half reactions of oxidation of fuel (such as hydrogen) and reduction of oxidant (such as oxygen), the middle is separated by an electrolyte membrane, ions migrate in the electrolyte membrane, and electrons do work through an external circuit. Fuel cells have components such as bipolar plates, gas diffusion layers, and catalyst layers in addition to electrolyte membranes.
Currently, the electrode plate materials used in fuel cells mainly include graphite, metal, and expanded graphite.
Graphite is the earliest material applied to the fuel cell bipolar plate, and the graphite bipolar plate has the advantages of good corrosion resistance, good affinity with a carbon fiber diffusion layer and the like, and can meet the requirement of long-term stable operation of the fuel cell. However, graphite has a large porosity, a low mechanical strength, and a large brittleness. In addition, the graphite plate is machined by a traditional machine, so that the process is complicated, the cost is high, and the batch production is not facilitated. The bipolar plate prepared from metals (aluminum, titanium, nickel and stainless steel) and alloys thereof (aluminum alloy, titanium alloy and the like) overcomes the defect of brittleness of a graphite plate, is suitable for batch production, and mainly has the defects of poor corrosion resistance, large contact resistance with an electrode diffusion layer and increased cost due to surface treatment.
After the expanded graphite pole plate is molded into a shape with a certain flow field, the expanded graphite pole plate needs to be put into liquid thermosetting resin for impregnation, and then the resin enters the solidification of the resin in the pores of the expanded graphite pole plate, so that the strength of the flexible graphite pole plate is improved, and the air tightness of the expanded graphite pole plate is also improved.
The impregnating resin mainly applied to the existing expanded graphite pole plate is thermosetting resin such as polyimide resin, acrylic resin, phenolic resin or epoxy resin; these resins such as phenolic resins and epoxy resins have the disadvantage of having too high a viscosity and inadequate gas impermeability of the impregnated expanded graphite sheet, whereas the low viscosity acrylic resin impregnated expanded graphite sheet has good gas impermeability but low strength.
For example, patent CN201910257160.7 discloses steps in a method for preparing a fuel cell bipolar plate by die pressing:
the resin adopted in the patent is polyimide resin, acrylic resin, phenolic resin or epoxy resin.
Present expanded graphite board flooding often uses acrylic resin, and this resin has viscosity low, and the effectual advantage of flooding mixes acrylic resin and a certain amount of azo-bis isobutyronitrile during the use, then the bending strength of graphite plate that the flooding was come out is 15 ~ 30MPa usually, and compressive strength is at 40 ~ 50MPa, and no matter bending strength or compressive strength are all lower, influence the structural design of polar plate, also can't further prepare the thinner expanded graphite bipolar plate of thickness simultaneously.
The strength of the expanded graphite pole plate after being impregnated depends on the selected resin to a great extent, so that the vinyl resin with more excellent performance is selected to impregnate the expanded graphite pole plate, and a product with better performance can be obtained.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a bipolar plate resin composition which has better bending strength and compressive strength, resists high temperature and corrosion and is more suitable for industrial production, a preparation method, a bipolar plate, a fuel cell and a vehicle
In order to solve the above technical problems, a first technical solution adopted by the present invention is:
a resin composition for bipolar plate contains vinyl resin (3-30%), styrene (70-97%) and inducer (0.1-1%).
Preferably, the vinyl resin is a standard bisphenol a epoxy vinyl resin, synthesized by reacting methacrylic acid with a bisphenol a epoxy resin.
As can be seen from the above description, bisphenol a epoxy vinyl resin synthesized by reacting methacrylic acid with bisphenol a epoxy resin can be easily dissolved in styrene solution. The resin has extremely active double bonds at two ends of a molecular chain, so that the vinyl resin can be quickly cured, the use strength is quickly obtained, and the polymer with high corrosion resistance is obtained.
Preferably, the inducer is azobisisobutyronitrile.
In order to solve the above technical problem, the second technical solution adopted by the present invention is:
a method for preparing a bipolar plate resin composition comprises
Adding a certain amount of styrene into the vinyl resin to reduce the viscosity of the resin system to 15 mPa.s;
adding a certain amount of azobisisobutyronitrile into the system, and uniformly stirring to obtain the resin composition.
Preferably, the obtained resin composition is stored in a low-temperature storage tank.
In order to solve the above technical problems, the third technical solution adopted by the present invention is:
a bipolar plate is obtained by impregnating an expanded graphite sheet with the above resin composition and then curing the impregnated sheet.
In order to solve the above technical problem, a fourth technical solution adopted by the present invention is:
a fuel cell comprises the bipolar plate.
In order to solve the above technical problems, a fifth technical solution adopted by the present invention is:
a vehicle includes the fuel cell.
The invention has the beneficial effects that: the bipolar plate (expanded graphite plate) obtained by the bipolar plate resin composition and the expanded graphite plate has the bending strength of 50MPa and the compressive strength of 80MPa, and greatly improves the mechanical property of the expanded graphite plate. Styrene is selected as a viscosity regulator of the vinyl resin, so that the viscosity of the resin can be regulated to 15mPa.s, and the preparation method is greatly suitable for graphite impregnation. The vinyl resin has the advantages of excellent bending strength and compressive strength, high temperature resistance and good corrosion resistance.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
Example one
A resin composition for bipolar plate comprises 3% of vinyl resin, 96.9% of styrene and 0.1% of azobisisobutyronitrile.
The vinyl resin is standard bisphenol A epoxy vinyl resin and is synthesized by reacting methacrylic acid with bisphenol A epoxy resin.
Example two
A resin composition for bipolar plates comprises 30% of vinyl resin, 69% of styrene and 1% of azobisisobutyronitrile.
The vinyl resin is standard bisphenol A epoxy vinyl resin and is synthesized by reacting methacrylic acid with bisphenol A epoxy resin.
EXAMPLE III
A resin composition for bipolar plate is prepared from vinyl resin (17%), styrene (82.5%) and azobisisobutyronitrile (0.5%).
The vinyl resin is standard bisphenol A epoxy vinyl resin and is synthesized by reacting methacrylic acid with bisphenol A epoxy resin.
Example four
A resin composition for bipolar plate comprises 10% of vinyl resin, 89.7% of styrene and 0.3% of azobisisobutyronitrile.
The vinyl resin is standard bisphenol A epoxy vinyl resin and is synthesized by reacting methacrylic acid with bisphenol A epoxy resin.
EXAMPLE five
A resin composition for bipolar plate comprises 23% of vinyl resin, 76.3% of styrene and 0.7% of azobisisobutyronitrile.
The vinyl resin is standard bisphenol A epoxy vinyl resin and is synthesized by reacting methacrylic acid with bisphenol A epoxy resin.
EXAMPLE six
A method for preparing a bipolar plate resin composition comprises
Adding a certain amount of styrene into the vinyl resin to reduce the viscosity of the resin system to 15 mPa.s;
adding a certain amount of azodiisobutyronitrile into the system, and uniformly stirring to obtain a resin composition;
the obtained resin composition was stored in a low-temperature storage tank.
EXAMPLE seven
A bipolar plate obtained by impregnating an expanded graphite sheet with the resin composition of any one of examples one to five and then curing the impregnated sheet.
Example eight
A fuel cell comprising the bipolar plate of embodiment seven.
Example nine
A vehicle comprising the fuel cell of embodiment eight.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.

Claims (8)

1. The bipolar plate resin composition is characterized by comprising 3-30% of vinyl resin, 70-97% of styrene and 0.1-1% of an inducer.
2. The bipolar plate resin composition of claim 1, wherein the vinyl resin is a standard bisphenol a epoxy vinyl resin synthesized by reacting methacrylic acid with a bisphenol a epoxy resin.
3. The bipolar plate resin composition of claim 1, wherein the inducing agent is azobisisobutyronitrile.
4. The preparation method of the bipolar plate resin composition is characterized by comprising
Adding a certain amount of styrene into the vinyl resin to reduce the viscosity of the resin system to 15 mPa.s;
adding a certain amount of azobisisobutyronitrile into the system, and uniformly stirring to obtain the resin composition.
5. The method for producing a bipolar plate resin composition as claimed in claim 4, wherein the obtained resin composition is stored in a low-temperature storage tank.
6. A bipolar plate obtained by impregnating an expanded graphite sheet with the resin composition according to any one of claims 1 to 3 and then curing the impregnated sheet.
7. A fuel cell comprising the bipolar plate of claim 6.
8. A vehicle characterized by comprising the fuel cell according to claim 7.
CN202110146862.5A 2021-02-03 2021-02-03 Bipolar plate resin composition, preparation method, bipolar plate, fuel cell and vehicle Pending CN114853929A (en)

Priority Applications (1)

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CN202110146862.5A CN114853929A (en) 2021-02-03 2021-02-03 Bipolar plate resin composition, preparation method, bipolar plate, fuel cell and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110146862.5A CN114853929A (en) 2021-02-03 2021-02-03 Bipolar plate resin composition, preparation method, bipolar plate, fuel cell and vehicle

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Publication Number Publication Date
CN114853929A true CN114853929A (en) 2022-08-05

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1344429A (en) * 1999-03-19 2002-04-10 量子组合物公司 Highly conductive molding compounds and fuel cell bipolar plates comprising these compounds
TWI221039B (en) * 2003-07-02 2004-09-11 Univ Tsinghua Preparation of fuel cell composite bipolar plate
US20040254294A1 (en) * 2003-06-11 2004-12-16 John Clulow Conductive adhesive sealant for bipolar fuel cell separator plate assemblies

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1344429A (en) * 1999-03-19 2002-04-10 量子组合物公司 Highly conductive molding compounds and fuel cell bipolar plates comprising these compounds
US20040254294A1 (en) * 2003-06-11 2004-12-16 John Clulow Conductive adhesive sealant for bipolar fuel cell separator plate assemblies
TWI221039B (en) * 2003-07-02 2004-09-11 Univ Tsinghua Preparation of fuel cell composite bipolar plate

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Application publication date: 20220805