WO2016005176A1 - Plaque bipolaire comprenant un élément d'étanchéité disposé dans une moulure et procédé de production d'une plaque bipolaire - Google Patents

Plaque bipolaire comprenant un élément d'étanchéité disposé dans une moulure et procédé de production d'une plaque bipolaire Download PDF

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Publication number
WO2016005176A1
WO2016005176A1 PCT/EP2015/063976 EP2015063976W WO2016005176A1 WO 2016005176 A1 WO2016005176 A1 WO 2016005176A1 EP 2015063976 W EP2015063976 W EP 2015063976W WO 2016005176 A1 WO2016005176 A1 WO 2016005176A1
Authority
WO
WIPO (PCT)
Prior art keywords
bead
bipolar plate
tempering
sealing element
base plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2015/063976
Other languages
German (de)
English (en)
Inventor
Friedhelm Walkling
Martin Buchenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of WO2016005176A1 publication Critical patent/WO2016005176A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H01M8/002—Shape, form of a fuel cell
    • H01M8/006—Flat
    • 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
    • H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
    • H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
    • 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
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • 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
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • 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

Definitions

  • Bipolar plate with arranged in bead sealing element
  • the invention relates to a bipolar plate for a fuel cell, comprising a base plate, which has a tempering side and an operating medium side opposite the tempering side, and a flow field for distributing an operating medium for the fuel cell, and a bead at least partially encircling the flow field, which opens away from the operating medium side and forms a density elevation on the operating medium side. Furthermore, the invention relates to a method for producing a bipolar plate for a fuel cell, in which a base plate of the bipolar plate is formed with a flow field and a flow field at least partially circumferential bead.
  • the density raised bump allows easy and efficient sealing of a flow volume between the operating media side of the base plate and a membrane electrode assembly adjacent to the base plate so that operating media can be safely routed to the membrane electrode assembly along the operating media side.
  • the density elevation may rest against the membrane-electrode arrangement and, in particular, be pressed against it, for example when the bipolar plate and the membrane-electrode arrangement are pressed together in a fuel cell stack.
  • a tempering fluid flowing over the tempering side and thereby tempering the fuel cell can flow off undesirably, so that a large part of the tempering fluid, for example a mixture of water and alcohol, flows through the bead without a significant tempering effect.
  • the Temperierfluidstrom is to increase, however, which worsens the temperature control of the fuel cell.
  • the invention is based on the object to provide a bipolar plate for a fuel cell and a method for producing a bipolar plate, wherein a bipolar plate having the fuel cell is efficiently tempered and the bipolar plate can be easily manufactured.
  • the object is achieved by at least one sealing element arranged in the bead.
  • the object is achieved for the aforementioned method in that in the bead a sealing element is introduced.
  • the amount of tempering fluid flowing through the bead is at least reduced, so that a larger proportion of the tempering fluid flowing over the tempering side is used to control the temperature of the fuel cell. Even if the tempering fluid flows into the bead, the running through the bead portion of the Temperierffenstroms is blocked. If the temperature control agent does not flow through the bead, it can lie flat on the temperature control side and flow over it. Consequently, the fuel cell can be tempered more efficiently.
  • the base plate may have two tempering openings, which are arranged outside a circulation area circumscribed by the bead for a tempering fluid of the flow field, wherein the sealing element is arranged in a section of the flow area extending between the tempering openings and through the bead.
  • tempering fluid can flow to the temperature control. If the bipolar plate is part of a fuel cell arrangement with several fuel cells, the two can
  • Tempering each part of a Temperierkanals be, for example, extends at least partially perpendicular to the base plate through the fuel cell assembly. Consequently, all the fuel cells of the fuel cell assembly can be easily replaced by the
  • the fluid can be conducted away from the temperature control side and in particular to the flow area through one of the temperature control openings and from there through the other of the temperature control openings.
  • the sealing element By arranging the sealing element in the bead extending between the tempering openings, a tempering fluid flow through the bead, which extends from one of the tempering openings to the other of the tempering openings, is reliably blocked, so that the tempering fluid can not flow off or only through the bead in a reduced amount.
  • the input is arranged, for example, behind the respective temperature control.
  • the output is arranged in the flow direction in front of the respective other temperature control. Even if tempering fluid should flow into the bead between the input and the output, it can no longer flow through the output to the other tempering opening, which reliably prevents or at least severely limits the outflow of the tempering fluid.
  • Temperierötechnische connect with each other both sections are blocked on the input side and output side.
  • the bead can absorb tempering fluid between the sealing elements blocking the bead. However, this can not be done by one of
  • the at least one sealing element preferably completely fills a cross section of the bead, so that the amount of tempering fluid which can flow past the sealing element through the bead is negligible.
  • the at least one sealing element may be dimensioned similarly along the bead, as transverse to the bead. Such a sealing element may be sufficient to sufficiently block the tempering fluid flow through the bead. Alternatively, the at least one sealing element may extend along the bead and thus be dimensioned larger along the bead than transversely to the bead. In particular, the at least one sealing element can substantially fill the bead along its course extending between the tempering openings, that is to say a section of the throughflow area extending through the bead.
  • the sealing element completely fills out at least one section of the bead extending between the tempering fluid openings, it can not only block the tempering fluid from flowing from one of the tempering openings to the other of the tempering openings through the bead. Rather, such a sealing element can also prevent the tempering laterally from the
  • Base plate drains and thus is no longer available for heat exchange with the tempering.
  • the base plate In order to bring the sealing element into the bead can, even if the bipolar plate is connected on the temperature side with another bipolar plate, the base plate a fluidly connected to the bead and, for example, up to an edge of the
  • the bipolar plate may have two base plates according to the invention whose tempering sides point towards one another and their operating media sides away from one another, and whose beads form at least one line blocked by the at least one sealing element.
  • the beads can open to each other and perpendicular to the base plate limit the line so that the line extends parallel to the base plate.
  • the conduit may be at least partially open towards a center of the base plate to a
  • this can be arranged in the bead before the base plate with another base plate for
  • Bipolar plate is joined together.
  • a sealing compound such as silicone
  • the sealing element may be solid in nature and, for example, an elastomeric stopper.
  • the sealing element can be introduced after the joining of the two base plates in the bead.
  • it may have the groove.
  • the groove is accessible from outside the bipolar plate.
  • the groove in the mounted state of the bipolar plate, the groove can form a injection channel opening laterally of the bipolar plate, through which a liquid material, for example liquid silicone, can be injected into the bead to form the sealing element.
  • Sealing element be formed so that it does not extend much further along the bead than transverse to the bead.
  • the sealing element along the bead have a greater extent than transversely thereto and fill the bead in particular completely.
  • Figure 1 is a schematic plan view of a first embodiment of a
  • FIG. 2 is a schematic sectional view of another embodiment of the bipolar plate according to the invention.
  • FIGS 3 and 4 are schematic representations of embodiments of the
  • the base plate 1 shows a base plate 1 of the bipolar plate according to the invention in a schematic plan view of a tempering 2 of the base plate. 1 Opposite the temperature control side 2, the base plate 1 has an operating medium side 3 with a flow field 4 for uniform distribution of operating media, for example hydrogen and air, within one
  • Fuel cell and in particular to a membrane electrode assembly of the fuel cell Fuel cell and in particular to a membrane electrode assembly of the fuel cell.
  • Density elevation 5 which circulates the flow field 4 and projecting from the flow field 4 on the operating medium side 3. If the base plate 1 is formed as an embossed sheet, the formation of the sealing elevation 5 produces a bead 6 which opens on the tempering side 2 and which circulates the flow field 4 on the tempering side 2. If, for example, the base plate 1 contacts another base plate on the temperature side, the bead 6 can be sealed at least in sections transversely to its course by the contact of the two base plates 1.
  • the base plate 1 operating medium openings 7, 7 ', 8, 8', which extend vertically through the base plate 1.
  • Each of the operating medium openings 7, 7 ', 8, 8' can on the tempering 2 of a Be sealed sealing edge 9, 9 ', wherein the sealing edge 9, 9' as well as the density elevation 5 in which the Grundpplatte 1 possibly forming sheet be embossed, but can project from the tempering 2.
  • the sealing edge 9, 9 ' prevents fluid flowing via the temperature-control side 2 from mixing with the respective operating medium.
  • one of the operating medium openings 7, 7 'or 8, 8' can likewise be circulated by a sealing edge 9, 9 ', so that either the operating medium flowing through the operating medium openings 7, 7' or through the operating medium openings 8, 8 ' is directed to the operating medium side 3 when the base plate 1 is arranged in the fuel cell stack.
  • the base plate 1 preferably has two tempering openings 10, 10 ', which likewise extend perpendicularly through the base plate 1. In the embodiment of Figure 1, only the operating media openings 7, 7 ', 8, 8', but not the tempering 10, 10 'of the bead 6 rotate.
  • Temperature control openings 10, 10 ' are located diagonally opposite each other. Also the
  • Operating medium openings 7 ', 8' arranged.
  • the base plate 1 is shown in the embodiment of Figure 1 by way of example rectangular. If the base plate 1 is not rectangular, then it must be ensured in the positioning of the openings 7, 7 ', 8, 8', 10, 10 'that the operating media and the tempering fluid over as large an area as possible of the base plate 1 of one of Operating media openings 7, 7 'or 8, 8' to the other of the
  • Operating medium openings 7, 7 'or 8, 8' or from one of the temperature control openings 10, 10 'to the other of the temperature control openings 10, 10' can flow.
  • the tempering fluid can flow transversely to the course of the bead 6 through it, from one of the tempering openings 10, 10' to a throughflow area D arranged between the tempering openings 10, 10 'and from there to the other of the tempering openings 10, 10 'to be able to flow, even if the base plate 1 contacted, for example, on the temperature side another base plate.
  • the flow field 4 is arranged between the operating medium openings 7, 8 and 7 ', 8' and distributes one of the operating media on the operating medium side 3 during operation of the fuel cell.
  • the flow field 4 can be structured for this purpose and have, for example, ducts, the structure of the flow field 4 in FIG the figure 1 is not shown for clarity. If the tempering fluid now flows through one of the tempering openings 10, 10 'and, for example, through the tempering opening 10, onto the tempering side 2, there is the risk that a not insignificant amount of the tempering fluid passes through the bead 6 to the respective other of the tempering openings 10, 10' and For example, to the temperature control 10 'flows.
  • the flow area D temperier chart
  • the flow field 4 and the adjacent to the flow field 4 bead 6 may include.
  • a portion T of the flow area D extending through the bead 6 can form a flow path P, through which a not insignificant proportion of the tempering fluid can flow during operation of the fuel cell.
  • the proportion of the tempering fluid flowing through the bead 6, for example, can make up 30% of the total tempering fluid conducted via the tempering side 2, is no longer available for the efficient exchange of heat with the tempering side 2, so that a larger amount of tempering fluid flows via the tempering side 2 must be promoted. As a result, the temperature control of the fuel cell is reduced.
  • at least one sealing element 1 1 is provided, which is arranged in the bead 6. The sealing element 1 1 thus blocks the
  • Temperature control openings 10, 10 'to the other of the temperature control openings 10, 10' can flow.
  • a Temperierfluidstrom S is shown schematically in the embodiment of Figure 1 by arrows, which point in possible flow directions of the tempering. Along the flow directions, two inputs E, E 'of the flow path P extending between the temperature control openings 10, 10' are shown behind the tempering opening 10.
  • a flow of the tempering fluid through the bead 6 is, however, through the sealing elements 1 1, 1 1 'and by optional in the outputs A, A' to be provided sealing elements 1 1 ", 1 1"'blocked.
  • the sealing elements 1 1, 1 1 ', 1 1 1 ", 1 1"' of the embodiment of Figure 1 seal the bead 6 only selectively.
  • the at least one sealing element 1 1 can continue along the bead 6, as it is transverse to the bead. 6 expands.
  • the at least one sealing element 1 1 can extend from the inlet E, E 'to the outlet A, A' of the flow path P extending through the bead 6.
  • the sealing element 1 1 fills the bead 6 between the inputs E, E 'and the outputs A, A' completely.
  • the beads 6 of both base plates 1 can form a line.
  • a cross section of the conduit may be completely filled by the sealing element 11 to block the flow path P.
  • the sealing element 1 1 completely fill the line, so that not only a flow of the tempering through the bead 6, but also a flow of the tempering laterally away from the base plate 1, is prevented.
  • FIG. 2 shows a further embodiment of the bipolar plate according to the invention in a lateral sectional view.
  • the same reference numerals are used.
  • the differences from the exemplary embodiment of FIG. 1 will be discussed below.
  • FIG. 2 schematically shows a bipolar plate 20 with two base plates 1, 1 'which are fastened to one another on the temperature side. Both base plates 1, 1 'each have a bead 6, 6', which together form the conduit 21, and form the operating medium side of the density elevations 5, 5 '.
  • the line 21 is accessible from outside the bipolar plate 20.
  • at least one of the base plates 1, 1 ' is provided with a groove 23 formed, which opens on the temperature side. If both base plates 1, 1 'each have a groove 23, 23', they can form a shot channel 24, through which a sealant, for example liquid silicone, can be injected into the line 21.
  • a sealant for example liquid silicone
  • the tempering mass can completely fill at least the cross-section of the line 21 and in particular the line 21. Even if tempering fluid can be exchanged with the conduit 21, the sealing element prevents flow through the conduit 21.
  • FIGS 3 and 4 show two embodiments of inventive method for
  • FIGS. 1 and 2 which are used to explain the methods below, are given the same reference numerals below.
  • the base plate 1 is formed.
  • the base plate 1 is formed from a sheet, this can for example be punched and in particular embossed, wherein in the embossing in particular the bead 6 and, for example, the flow field 4 and the sealing edges 9, 9 'can be formed.
  • the base plate 1 is not formed from a metal sheet but, for example, from a plastic, then the base plate 1 can also be injection-molded. Other shaping methods, such as milling, are also possible.
  • method step 31 is followed by method step 32, in which the at least one sealing element 11 is arranged in bead 6.
  • the method step 33 may follow, in which the base plates 1, 1 'to the bipolar plate 20 are joined together.
  • the method step 31 can be followed by the method step 33, in which the base plates 1, 1' are joined together.
  • method step 32 may be followed by method step 32, in which the at least one sealing element 11 is arranged in bead 6.
  • the groove 23 can additionally be formed during the method step 31, so that in the method step 32 of the method 30', a liquid and curable sealant can be introduced into the line 21 through the containment channel 24.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne une plaque bipolaire (20) pour une pile à combustible ainsi qu'un procédé de production d'une plaque bipolaire. La plaque bipolaire comprend une plaque de base (1) qui présente une face de thermorégulation (2) et une face de milieux de fonctionnement (3) opposée à la face de thermorégulation (2), ainsi qu'un champ de flux (4) servant à répartir un milieu de fonctionnement pour la pile à combustible, et une moulure (6) qui fait le tour du champ de flux (4), qui s'ouvre à distance de la face de milieux de fonctionnement (3) et qui forme sur la face de milieux de fonctionnement (3) une élévation d'étanchéité (5). L'invention vise à pouvoir refroidir efficacement la pile à combustible. A cet effet, selon l'invention, au moins un élément d'étanchéité (11) est disposé dans une moulure (6, 6') de la plaque de base (1).
PCT/EP2015/063976 2014-07-08 2015-06-22 Plaque bipolaire comprenant un élément d'étanchéité disposé dans une moulure et procédé de production d'une plaque bipolaire Ceased WO2016005176A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014213192.8A DE102014213192A1 (de) 2014-07-08 2014-07-08 Bipolarplatte mit in Sicke angeordnetem Dichtelement und Verfahren zur Herstellung einer Bipolarplatte
DE102014213192.8 2014-07-08

Publications (1)

Publication Number Publication Date
WO2016005176A1 true WO2016005176A1 (fr) 2016-01-14

Family

ID=53434365

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/063976 Ceased WO2016005176A1 (fr) 2014-07-08 2015-06-22 Plaque bipolaire comprenant un élément d'étanchéité disposé dans une moulure et procédé de production d'une plaque bipolaire

Country Status (2)

Country Link
DE (1) DE102014213192A1 (fr)
WO (1) WO2016005176A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10324157B3 (de) * 2003-05-22 2004-08-19 Reinz-Dichtungs-Gmbh & Co. Kg Hochtemperatur-Brennstoffzellensystem
DE102012214268A1 (de) * 2011-08-16 2013-02-21 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Formungs- und Füll-Unterdichtung
DE102012221730A1 (de) * 2012-11-28 2014-05-28 Robert Bosch Gmbh Verfahren zum Abdichten eines Kühlmittelraums einer Bipolarplatte einer Brennstoffzelle sowie Brennstoffzelle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3830805B2 (ja) * 2001-11-07 2006-10-11 本田技研工業株式会社 燃料電池
DE102006056468A1 (de) * 2005-11-28 2007-07-05 Behr Gmbh & Co. Kg Bipolarplatte, insbesondere für einen Brennstoffzellenstapel eines Fahrzeugs
KR101210638B1 (ko) * 2010-11-17 2012-12-07 현대자동차주식회사 가스켓을 가지는 연료전지용 분리판 및 이의 제조방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10324157B3 (de) * 2003-05-22 2004-08-19 Reinz-Dichtungs-Gmbh & Co. Kg Hochtemperatur-Brennstoffzellensystem
DE102012214268A1 (de) * 2011-08-16 2013-02-21 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Formungs- und Füll-Unterdichtung
DE102012221730A1 (de) * 2012-11-28 2014-05-28 Robert Bosch Gmbh Verfahren zum Abdichten eines Kühlmittelraums einer Bipolarplatte einer Brennstoffzelle sowie Brennstoffzelle

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