CN112477245B - Mould pressing preparation method of flexible graphite bipolar plate - Google Patents

Mould pressing preparation method of flexible graphite bipolar plate Download PDF

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Publication number
CN112477245B
CN112477245B CN202011243625.2A CN202011243625A CN112477245B CN 112477245 B CN112477245 B CN 112477245B CN 202011243625 A CN202011243625 A CN 202011243625A CN 112477245 B CN112477245 B CN 112477245B
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China
Prior art keywords
bipolar plate
laser
mold
die
flexible graphite
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CN202011243625.2A
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CN112477245A (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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Hubei Mofang New Energy Technology Co ltd
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Classifications

    • 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 application provides a mould 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 die, and then pressing the die 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 the leftover materials to obtain the bipolar plate product. The mould pressing preparation method provided by the application can completely remove burrs of a product and completely eliminate the problems of short circuit and the like caused by burrs of a follow-up polar plate in a galvanic pile.

Description

Mould pressing preparation method of flexible graphite bipolar plate
Technical Field
The application relates to the technical field of manufacturing of fuel cell parts, in particular to a mould 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 being limited by Carnot cycle, so that the energy conversion efficiency is high, and the proton exchange membrane fuel cell is environment-friendly and can be widely used for transportation, ground power generation and the like. However, the voltage of the single battery is low (0.6V-1.0V), so that in order to obtain the practically usable voltage, a plurality of single batteries need to be connected in series, and the serial connection piece is called a bipolar plate, and the bipolar plate has the functions of separating hydrogen and oxygen, collecting current and supporting a membrane electrode, and simultaneously plays roles of heat dissipation and drainage of the whole battery system, so that the material for manufacturing the bipolar plate needs to have the characteristics of corrosion resistance, good conductivity, high mechanical strength, low price and easiness in batch processing.
Bipolar plates are largely 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 molded for mass production, 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 a die; vacuumizing and maintaining pressure; the die is pressed down according to the set value pressing pressure; breaking vacuum; manually/mechanically removing the waste material and taking out the polar plate; the graphite bipolar plate produced by the process has the problems of more burrs at corners, easiness in damaging the plate when waste materials are removed, and the like.
Disclosure of Invention
In view of the above, the present application provides a method for manufacturing a flexible graphite bipolar plate by compression molding, which is capable of completely removing burrs.
The application provides a mould 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 and maintaining the inside of the die for a period of time, and then pressing the die according to a set pressure;
s103, introducing nitrogen or other gases into the die to break vacuum, opening the die, and taking out the whole bipolar plate product;
and S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing the leftover materials to obtain the 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 limit, and the thickness of first edge suppression portion and second edge suppression portion is less, and the setting of bevel limit and thickness can ensure can not lead to product edge fracture because of the extrusion of mould to the product in the compression process, can give polar plate edge trait again simultaneously and make things convenient for follow-up CCD to shoot at the compression process.
Further, in step S102, after the vacuum is applied, the relative atmospheric pressure in the mold is 100MPa to 500MPa.
Further, in step S102, the set pressure is 5000MPa to 40000MPa.
Further, in step S104, the laser mode of the laser is a TEM00 mode laser, the beam divergence angle is as small as possible, and the continuous output mode cutting is adopted.
Further, in step S104, the laser power of the laser is 50KW, 100KW or 250KW; the laser is used for cutting the product and the leftover materials, after cutting, the cut product has no burrs due to the characteristics of high temperature of the laser and combustibility of graphite, and meanwhile, the product is more easily separated from the leftover materials.
Further, in step S104, oxygen with purity not less than 95% is introduced during the laser cutting process by using the air blowing pipe, and the oxygen blowing amount needs to be kept continuously and uniformly during the cutting process, and the blowing direction of the oxygen is opposite to the cutting direction.
Further, the laser instrument is from right to left removal, the gas blowing pipe passes through a plurality of supports to be fixed in the left side of laser instrument, the gas blowing pipe includes vertical portion and tilting portion, vertical portion is equipped with the air inlet, tilting portion is equipped with the gas outlet, the gas outlet blows out oxygen from left to right to the direction that laser sent.
The technical scheme provided by the application has the beneficial effects that: according to the die pressing preparation method provided by the application, leftover materials and products are not broken in the die pressing process of the polar plate, the pressed products and redundant leftover materials are still integrated, the products and the leftover materials are separated in a laser cutting mode after the integrated products are taken out, 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 mould pressing preparation method provided by the application improves the consistency of the appearance and the dimension of the product and can improve the success rate of electric pile loading; the bipolar plate product prepared by the mould pressing preparation method provided by the application is easier to separate from the leftover materials, and the problem that quality is affected due to the occurrence of 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 process for preparing a flexible graphite bipolar plate according to the present application.
Fig. 2 is a schematic structural diagram of a mold used in the molding process of the flexible graphite bipolar plate of the present application.
Fig. 3 is a schematic drawing of blow air from a compression molding process for making flexible graphite bipolar plates according to the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1, embodiment 1 of the present application provides a method for preparing a flexible graphite bipolar plate by compression molding, comprising the following steps:
step S101, placing graphite into a mold, and then closing the mold;
step S102, vacuumizing and maintaining the inside of the die for a period of time, and then pressing the die according to a set pressure; wherein, after vacuumizing, the relative atmospheric pressure in the die is 200MPa; setting the pressure to 6000MPa;
step S103, introducing nitrogen into the die to break vacuum, opening the die, and taking out the whole bipolar plate product;
step S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing the leftover materials to obtain a bipolar plate finished product; the laser mode is a TEM00 mode laser, the laser power is 50KW, oxygen with the purity of more than or equal to 95% 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:
the embodiment 2 of the application provides a mould pressing preparation method of a flexible graphite bipolar plate, which comprises the following steps:
step S101, placing graphite into a mold, and then closing the mold;
step S102, vacuumizing and maintaining the inside of the die for a period of time, and then pressing the die according to a set pressure; wherein, after vacuumizing, the relative atmospheric pressure in the die is 150MPa; setting the pressure to be 8000MPa;
step S103, introducing air into the die to break vacuum, opening the die, and taking out the whole bipolar plate product;
step S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing the leftover materials to obtain a bipolar plate finished product; the laser mode is a TEM00 mode laser, the laser power is 100KW, oxygen with the purity of more than or equal to 95% 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:
the embodiment 3 of the application provides a mould pressing preparation method of a flexible graphite bipolar plate, which comprises the following steps:
step S101, placing graphite into a mold, and then closing the mold;
step S102, vacuumizing and maintaining the inside of the die for a period of time, and then pressing the die according to a set pressure; wherein, after vacuumizing, the relative atmospheric pressure in the die is 250MPa; setting the pressure to 9000MPa;
step S103, introducing nitrogen into the die to break vacuum, opening the die, and taking out the whole bipolar plate product;
step S104, cutting along the outer surface of the bipolar plate product by using a laser, and removing the leftover materials to obtain a bipolar plate finished product; the laser mode is a TEM00 mode laser, the laser power is 250W, oxygen with the purity of more than or equal to 95% 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.
In the above-described embodiment 1 to embodiment 3, the schematic diagram of the mold used is shown in fig. 2, and the mold includes an upper mold 1 and a lower mold 2, wherein the upper mold 1 is provided with two first edge pressing portions 11, the sides of the two first edge pressing portions 11 are both diagonal sides, and the lower mold 2 is provided with two second edge pressing portions 21, and the sides of the two second edge pressing portions 21 are both diagonal sides.
In the above embodiment 1-embodiment 3, the schematic blowing diagram is shown in fig. 3, referring to fig. 3, the blowing tube 3 is fixed on the left side of the laser 5 by a plurality of brackets 4, the blowing tube 3 includes a vertical portion 31 and an inclined portion 32, the vertical portion 31 is provided with an air inlet 311, the inclined portion 32 is provided with an air outlet 321, the laser 5 moves from right to left during the cutting process, and the air outlet 321 blows oxygen from left to right in the direction of laser emission.
In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application.
The embodiments described above and features of the embodiments herein may be combined with each other without conflict.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.

Claims (7)

1. The mould pressing preparation method of the flexible graphite bipolar plate is characterized by comprising the following steps of:
s101, placing graphite into a mold, and then closing the mold;
s102, vacuumizing and maintaining the pressure in the die, and then pressing the die according to the set pressure;
s103, introducing gas into the mold to break vacuum, opening the mold, and taking out the whole bipolar plate product;
s104, cutting along the outer surface of the bipolar plate product by using a laser, and removing the leftover materials to obtain a bipolar plate finished product;
the die comprises an upper die and a lower die, the upper die is provided with two first edge pressing parts, the lower die is provided with two second edge pressing parts, the sides of the first edge pressing parts and the second edge pressing parts are bevel edges, the thicknesses of the first edge pressing parts and the second edge pressing parts are smaller, and the arrangement of the bevel edges and the thicknesses can ensure that the edges of the products are not broken due to the extrusion of the dies to the products in the pressing process, and meanwhile, polar plate edge characteristics can be given out in the pressing process, so that the subsequent CCD (charge coupled device) shooting is convenient.
2. The method for producing a flexible graphite bipolar plate according to claim 1, wherein in step S102, the relative atmospheric pressure in the mold after the evacuation is 100MPa to 500MPa.
3. The method for producing a flexible graphite bipolar plate according to claim 1, wherein in step S102, the pressure is set to a value of 5000MPa to 40000MPa.
4. The method according to claim 1, wherein in step S104, the laser mode of the laser is TEM00 mode laser.
5. The method of claim 1, wherein in step S104, the laser power of the laser is 50KW, 100KW or 250KW.
6. The method for manufacturing a flexible graphite bipolar plate according to claim 1, wherein in step S104, oxygen with purity not less than 95% is introduced during laser cutting by using a blowing pipe, and the blowing direction of the oxygen is opposite to the cutting direction.
7. The method for manufacturing a flexible graphite bipolar plate according to claim 6, wherein the laser moves from right to left, the air blowing pipe is fixed on the left side of the laser through a plurality of brackets, 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 of 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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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
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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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

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US7009136B2 (en) * 2002-10-09 2006-03-07 General Motors Corporation Method of fabricating a bipolar plate assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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