CN112477245A - Die pressing preparation method of flexible graphite bipolar plate - Google Patents

Die pressing preparation method of flexible graphite bipolar plate Download PDF

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Publication number
CN112477245A
CN112477245A CN202011243625.2A CN202011243625A CN112477245A CN 112477245 A CN112477245 A CN 112477245A CN 202011243625 A CN202011243625 A CN 202011243625A CN 112477245 A CN112477245 A CN 112477245A
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China
Prior art keywords
mold
bipolar plate
laser
flexible graphite
graphite bipolar
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CN202011243625.2A
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Chinese (zh)
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CN112477245B (en
Inventor
华周发
陈煦帆
刘震
杨海军
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Hubei Mofang New Energy Technology Co ltd
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Shandong Cube New Energy Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/28—Presses specially adapted for particular purposes for forming shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/40—Removing material taking account of the properties of the material involved
    • B23K26/402—Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0213—Gas-impermeable carbon-containing materials
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0234—Carbonaceous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
    • 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

Abstract

The invention provides a die pressing preparation method of a flexible graphite bipolar plate, which comprises the following steps: placing graphite into a mold, and then closing the mold; vacuumizing and maintaining the pressure in the mold, and then pressing the mold according to the set pressure; introducing gas into the mold to break vacuum, opening the mold, and taking out the bipolar plate product integrally; and cutting along the outer surface of the bipolar plate product by using a laser, and removing leftover materials to obtain a finished bipolar plate product. The mould pressing preparation method provided by the invention can completely remove product burrs and completely eliminate the problems of short circuit and the like caused by the burrs of the subsequent electrode plate in the galvanic pile.

Description

Die pressing preparation method of flexible graphite bipolar plate
Technical Field
The invention relates to the technical field of fuel cell part manufacturing, in particular to a die pressing preparation method of a flexible graphite bipolar plate.
Background
The proton exchange membrane fuel cell directly converts chemical energy in hydrogen and oxygen into electric energy without the restriction of Carnot cycle, so the proton exchange membrane fuel cell has high energy conversion efficiency and environmental protection, and can be widely used for transportation, ground power generation and the like. However, the voltage of a single cell is low (0.6V-1.0V), so in order to obtain a practically usable voltage, a plurality of single cells need to be connected in series, the connected members in series are called bipolar plates, and the bipolar plates have the functions of separating hydrogen and oxygen, collecting current and supporting membrane electrodes, and simultaneously have the functions of heat dissipation and drainage of the whole cell system, so the materials for manufacturing the bipolar plates need to have the characteristics of corrosion resistance, good electric conduction, high mechanical strength, low price and easy batch processing.
The bipolar plates are mainly classified into graphite bipolar plates (hard graphite bipolar plates and flexible graphite bipolar plates), composite bipolar plates, and metal bipolar plates. The flexible graphite bipolar plate has the characteristics of high conductivity and corrosion resistance, has certain toughness, can be produced in a mould pressing batch mode, and is an ideal fuel cell bipolar plate.
The current mould pressing production process of the flexible graphite bipolar plate comprises the following steps: pressing down by a press, and closing the die; vacuumizing and maintaining pressure; pressing the die according to a set value; breaking vacuum; removing waste materials manually/mechanically, and taking out the polar plate; the graphite bipolar plate produced by the process has the problems of more corner burrs, easy damage to the bipolar plate when waste materials are removed and the like.
Disclosure of Invention
In view of the above, the invention provides a method for preparing a flexible graphite bipolar plate by die pressing, which can completely remove burrs.
The invention provides a die pressing preparation method of a flexible graphite bipolar plate, which comprises the following steps:
s101, placing graphite into a mold, and then closing the mold;
s102, vacuumizing the mold, keeping the mold for a period of time, and pressing the mold according to set pressure;
s103, introducing nitrogen or other gases into the mold to break vacuum, opening the mold, and taking out the bipolar plate product integrally;
and S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing leftover materials to obtain a finished bipolar plate product.
Further, the mould includes mould and bed die, it is equipped with two first edge suppression portions to go up the mould, the bed die is equipped with two second edge suppression portions, the side of first edge suppression portion and second edge suppression portion is the bevel edge, and the thickness of first edge suppression portion and second edge suppression portion is less, and the setting of bevel edge and thickness can ensure can not lead to product edge fracture because of the mould to the extrusion of product in the pressing process, can give the convenient follow-up CCD of polar plate edge speciality simultaneously again and shoot at the pressing in-process.
Further, in step S102, after evacuation, the relative atmospheric pressure in the mold is 100MPa to 500 MPa.
Further, in step S102, the set pressure is 5000MPa to 40000 MPa.
Further, in step S104, the laser mode of the laser is TEM00 mode laser, the beam divergence angle is as small as possible, and the cutting is performed in a continuous output manner.
Further, in step S104, the laser power of the laser is 50KW, 100KW, or 250 KW; the laser is used for cutting the product and the leftover materials, and the cut product has no rough edges due to the characteristics that the laser is high in temperature and graphite is combustible, and meanwhile, the product is easier to separate from the leftover materials.
Further, in step S104, oxygen with a purity of not less than 95% is introduced by using an air blowing pipe during the laser cutting process, and the blowing amount of the oxygen needs to be kept continuous and uniform during the cutting process, wherein the blowing direction of the oxygen is opposite to the cutting direction.
Further, the laser moves from right to left, the air blowing pipe is fixed on the left side of the laser through a plurality of supports, the air blowing pipe comprises a vertical portion and an inclined portion, the vertical portion is provided with an air inlet, the inclined portion is provided with an air outlet, and the air outlet blows oxygen from left to right in the direction sent by the laser.
The technical scheme provided by the invention has the beneficial effects that: according to the die pressing preparation method provided by the invention, the leftover materials and the products are not broken in the die pressing process of the polar plate, the pressed products and the redundant leftover materials are still integrated, the products and the leftover materials are separated in a laser cutting mode after the integrated product is taken out, the burrs of the products can be completely removed, and the problems of short circuit and the like caused by the burrs of the subsequent polar plate in a galvanic pile are completely eliminated; the die pressing preparation method provided by the invention improves the consistency of the appearance size of the product, and can improve the success rate of stacking the galvanic pile; the bipolar plate product prepared by the die pressing preparation method provided by the invention is easier to separate from the leftover materials, and the problem that the quality is affected by gaps and the like when the leftover materials are separated from the product in the traditional process is solved.
Drawings
FIG. 1 is a schematic flow chart of a molding preparation method of a flexible graphite bipolar plate according to the present invention.
Fig. 2 is a schematic structural diagram of a mold used in the molding preparation method of the flexible graphite bipolar plate of the present invention.
Fig. 3 is a schematic diagram of the air blowing of the molding preparation method of the flexible graphite bipolar plate of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1, an embodiment 1 of the present invention provides a method for preparing a flexible graphite bipolar plate by die pressing, including the following steps:
step S101, putting graphite into a mold, and then closing the mold;
step S102, vacuumizing the mold, keeping the mold for a period of time, and pressing the mold according to set pressure; wherein, after vacuum pumping, the relative atmospheric pressure in the mould is 200 MPa; setting the pressure to be 6000 MPa;
step S103, introducing nitrogen into the mold to break vacuum, opening the mold, and taking out the bipolar plate product integrally;
step S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing leftover materials to obtain a finished bipolar plate product; wherein, the laser mode adopts the laser of TEM00 mode, the laser power is 50KW, oxygen with the purity more than or equal to 95 percent is introduced in the laser cutting process by utilizing an air blowing pipe, and the air blowing direction of the oxygen is opposite to the cutting direction.
Example 2:
embodiment 2 of the present invention provides a method for preparing a flexible graphite bipolar plate by die pressing, comprising the following steps:
step S101, putting graphite into a mold, and then closing the mold;
step S102, vacuumizing the mold, keeping the mold for a period of time, and pressing the mold according to set pressure; wherein, after vacuum pumping, the relative atmospheric pressure in the mould is 150 MPa; the set pressure is 8000 MPa;
step S103, introducing air into the mold to break vacuum, opening the mold, and taking out the bipolar plate product integrally;
step S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing leftover materials to obtain a finished bipolar plate product; wherein, the laser mode adopts the laser of TEM00 mode, the laser power is 100KW, oxygen with the purity more than or equal to 95 percent is introduced in the laser cutting process by utilizing an air blowing pipe, and the air blowing direction of the oxygen is opposite to the cutting direction.
Example 3:
embodiment 3 of the present invention provides a method for preparing a flexible graphite bipolar plate by die pressing, comprising the following steps:
step S101, putting graphite into a mold, and then closing the mold;
step S102, vacuumizing the mold, keeping the mold for a period of time, and pressing the mold according to set pressure; wherein, after vacuum pumping, the relative atmospheric pressure in the mould is 250 MPa; setting the pressure to 9000 MPa;
step S103, introducing nitrogen into the mold to break vacuum, opening the mold, and taking out the bipolar plate product integrally;
step S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing leftover materials to obtain a finished bipolar plate product; wherein, the laser mode adopts TEM00 mode laser, the laser power is 250W, oxygen with the purity more than or equal to 95 percent is introduced in the laser cutting process by using an air blowing pipe, and the air blowing direction of the oxygen is opposite to the cutting direction.
In the above-described embodiments 1 to 3, the schematic view of the mold used is shown in fig. 2, the mold includes an upper mold 1 and a lower mold 2, the upper mold 1 is provided with two first edge pressing portions 11, both side edges of the two first edge pressing portions 11 are beveled edges, the lower mold 2 is provided with two second edge pressing portions 21, both side edges of the two second edge pressing portions 21 are beveled edges.
In the above embodiments 1 to 3, the schematic drawing of air blowing is shown in fig. 3, referring to fig. 3, the air blowing pipe 3 is fixed on the left side of the laser 5 by a plurality of brackets 4, the air blowing pipe 3 includes a vertical part 31 and an inclined part 32, the vertical part 31 is provided with an air inlet 311, the inclined part 32 is provided with an air outlet 321, the laser 5 moves from right to left during cutting, and the air outlet 321 blows oxygen from left to right in the direction of laser emission.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The die pressing preparation method of the flexible graphite bipolar plate is characterized by comprising the following steps:
s101, placing graphite into a mold, and then closing the mold;
s102, vacuumizing and maintaining pressure in the mold, and then pressing the mold according to set pressure;
s103, introducing gas into the mold to break vacuum, opening the mold, and taking out the bipolar plate product integrally;
and S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing leftover materials to obtain a finished bipolar plate product.
2. The molding method of a flexible graphite bipolar plate according to claim 1, wherein the mold comprises an upper mold provided with two first edge pressing portions and a lower mold provided with two second edge pressing portions, and wherein the side edges of the first and second edge pressing portions are both beveled edges.
3. The molding process of claim 1, wherein in step S102, after evacuation, the relative atmospheric pressure in the mold is 100MPa to 500 MPa.
4. The molding method of flexible graphite bipolar plate according to claim 1, wherein the pressure is set to 5000MPa to 40000MPa in step S102.
5. The molding method for preparing a flexible graphite bipolar plate according to claim 1, wherein in step S104, the laser mode of the laser is TEM00 mode laser.
6. The process of claim 1, wherein in step S104, the laser power of the laser is 50KW, 100KW or 250 KW.
7. The mold pressing preparation method of the flexible graphite bipolar plate as claimed in claim 1, wherein in step S104, oxygen with purity not less than 95% is introduced by using an air blow pipe in the laser cutting process, and the air blow direction of the oxygen is opposite to the cutting direction.
8. The embossing preparation method of the flexible graphite bipolar plate as claimed in claim 7, wherein the laser moves from right to left, the gas blowing pipe is fixed on the left side of the laser through a plurality of brackets, the gas blowing pipe comprises a vertical part and an inclined part, the vertical part is provided with a gas inlet, the inclined part is provided with a gas outlet, and the gas outlet blows oxygen from left to right in the direction of the laser emission.
CN202011243625.2A 2020-11-10 2020-11-10 Mould pressing preparation method of flexible graphite bipolar plate Active CN112477245B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113524768A (en) * 2021-06-23 2021-10-22 河南城建学院 Pressing device for graphite bipolar plate of fuel cell
CN116278144A (en) * 2023-05-25 2023-06-23 上海韵量新能源科技有限公司 Fuel cell graphite bipolar plate punching and die pressing integrated die and punching and die pressing method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040072053A1 (en) * 2002-10-09 2004-04-15 Harald Schlag Method of fabricating a bipolar plate assembly
TW200945650A (en) * 2008-04-25 2009-11-01 Nat Univ Chin Yi Technology Manufacturing method for fuel cell dual-electrode board
CN102211255A (en) * 2010-04-09 2011-10-12 深圳市大族激光科技股份有限公司 Laser cutting method and equipment
CN107046140A (en) * 2017-04-06 2017-08-15 大连融科储能装备有限公司 A kind of fluorine-containing bipolar plates and preparation method thereof
CN107584209A (en) * 2016-07-08 2018-01-16 京东方科技集团股份有限公司 Laser cutting device
CN109768296A (en) * 2019-01-26 2019-05-17 杭州德海艾科能源科技有限公司 A kind of bipolar plate of all-vanadium redox flow battery and its preparation process
CN109940809A (en) * 2017-12-20 2019-06-28 中国科学院大连化学物理研究所 A kind of graphite bi-polar plate punch-forming mold used for high-temperature fuel cell and method
CN110696416A (en) * 2019-10-31 2020-01-17 山东魔方新能源科技有限公司 Graphite bipolar plate compression molding system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040072053A1 (en) * 2002-10-09 2004-04-15 Harald Schlag Method of fabricating a bipolar plate assembly
TW200945650A (en) * 2008-04-25 2009-11-01 Nat Univ Chin Yi Technology Manufacturing method for fuel cell dual-electrode board
CN102211255A (en) * 2010-04-09 2011-10-12 深圳市大族激光科技股份有限公司 Laser cutting method and equipment
CN107584209A (en) * 2016-07-08 2018-01-16 京东方科技集团股份有限公司 Laser cutting device
CN107046140A (en) * 2017-04-06 2017-08-15 大连融科储能装备有限公司 A kind of fluorine-containing bipolar plates and preparation method thereof
CN109940809A (en) * 2017-12-20 2019-06-28 中国科学院大连化学物理研究所 A kind of graphite bi-polar plate punch-forming mold used for high-temperature fuel cell and method
CN109768296A (en) * 2019-01-26 2019-05-17 杭州德海艾科能源科技有限公司 A kind of bipolar plate of all-vanadium redox flow battery and its preparation process
CN110696416A (en) * 2019-10-31 2020-01-17 山东魔方新能源科技有限公司 Graphite bipolar plate compression molding system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113524768A (en) * 2021-06-23 2021-10-22 河南城建学院 Pressing device for graphite bipolar plate of fuel cell
CN116278144A (en) * 2023-05-25 2023-06-23 上海韵量新能源科技有限公司 Fuel cell graphite bipolar plate punching and die pressing integrated die and punching and die pressing method
CN116278144B (en) * 2023-05-25 2023-09-01 上海韵量新能源科技有限公司 Fuel cell graphite bipolar plate punching and die pressing integrated die and punching and die pressing method

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Address after: B312-111, No. 2 Fengwei Road, Huizhi Enterprise Center, Xishan Economic and Technological Development Zone, Wuxi City, Jiangsu Province, 214000

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