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WO2009067617A1 - Ensemble de plaques de champ d'écoulement pour pile à combustible - Google Patents

Ensemble de plaques de champ d'écoulement pour pile à combustible Download PDF

Info

Publication number
WO2009067617A1
WO2009067617A1 PCT/US2008/084224 US2008084224W WO2009067617A1 WO 2009067617 A1 WO2009067617 A1 WO 2009067617A1 US 2008084224 W US2008084224 W US 2008084224W WO 2009067617 A1 WO2009067617 A1 WO 2009067617A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow field
field plate
cross
plates
plate assembly
Prior art date
Application number
PCT/US2008/084224
Other languages
English (en)
Inventor
Simon Farrington
Original Assignee
Bdf Ip Holdings Ltd.
Ballard Material Products Inc.
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 Bdf Ip Holdings Ltd., Ballard Material Products Inc. filed Critical Bdf Ip Holdings Ltd.
Publication of WO2009067617A1 publication Critical patent/WO2009067617A1/fr

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
    • H01M8/02—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
    • H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
    • 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
    • H01M8/0206—Metals or alloys
    • 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
    • H01M8/0223—Composites
    • H01M8/0226—Composites in the form of mixtures
    • 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric electrolytes
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates generally to a flow field plate assembly for a fuel cell, and, more particularly, to a flow field plate assembly with reduced effects of the residual deformation of the plates on the reactant channel alignment.
  • fuel is electrochemically oxidized on the anode side, typically resulting in the generation of protons, electrons, and possibly other species depending on the fuel employed.
  • the protons are conducted from the reaction sites at which they are generated, through the membrane, to electrochemically react with the oxidant on the cathode side.
  • the electrons travel through an external circuit providing useable power and then react with the protons and oxidant on the cathode side to generate water reaction product.
  • the fuel stream may be substantially pure hydrogen gas, a gaseous hydrogen-containing reformate stream, or methanol in a direct methanol fuel cell.
  • the oxidant may be, for example, substantially pure oxygen or a dilute oxygen stream such as air.
  • the electrocatalyst is typically a precious metal composition (e.g., platinum metal black or an alloy thereof) and may be provided on a suitable support (e.g., fine platinum particles supported on a carbon black support).
  • a precious metal composition e.g., platinum metal black or an alloy thereof
  • a suitable support e.g., fine platinum particles supported on a carbon black support
  • a MEA In a fuel cell, a MEA is typically interposed between two separator plates that are substantially impermeable to the reactant fluid streams.
  • the plates typically act as current collectors and provide support for the MEA.
  • the assembly is typically compressed to ensure good electrical contact between the plates and the electrodes, in addition to good sealing between fuel cell components.
  • a plurality of fuel cell assemblies may be combined in series or in parallel to form a fuel cell stack.
  • a plate may be shared between adjacent fuel cell assemblies, in which case the plate also serves as a separator to fluidly isolate the fluid streams of the adjacent fuel cell assemblies.
  • these plates on either side of the MEA may incorporate flow fields for the purpose of directing reactants across the surfaces of the fluid diffusion electrodes or electrode substrates.
  • the flow fields comprise fluid distribution channels separated by landings.
  • the channels provide passages for the distribution of reactant to the electrode surfaces and also for the removal of reaction products and depleted reactant streams.
  • the landings act as mechanical supports for the fluid distribution layers in the MEA and provide electrical contact thereto. Because it is interposed between two adjacent MEAs a plate has to be provided with oxidant distribution channels on one side and with fuel distribution channels on the other.
  • flow field plates may also include channels for directing coolant fluids along specific portions of the fuel cell.
  • coolant distribution channels are formed as channels that traverse through the plate or, in the case of a flow field plate assembly, as partial coolant channels incorporated on the inner surface of each plate to form complete coolant distribution channels when the two plates are assembled together.
  • Plates are typically made of expanded graphite or metal.
  • Expanded graphite (e.g., Grafoil®) plates are typically embossed side-by-side on one sheet of material, surrounded by a frame containing various additional features to aid in the manufacturing of the parts (e.g., alignment features, sacrificial edges to protect the part from handling damage).
  • Anode and cathode plates can be embossed side by side on a single sheet of Grafoil. After embossing, the plates may be impregnated with a resin and cured.
  • Bipolar plate assemblies are then made by applying glue to the sheet material containing the plates and bonding this sheet to another identical sheet that is flipped over to form two bipolar plate assemblies side by side.
  • the fuel and oxidant plates may be each made on separate dies and they are afterwards aligned to one another to ensure proper alignment of the channels so that when the fuel cell stack is assembled, the MEA in each fuel cell is properly supported by opposing anode and cathode plate landings.
  • a problem that may arise during this manufacturing process is that, after the plates are embossed on the graphite sheet and impregnated, there is a certain amount of dimensional change due to the elastic recovery of the plate material and/or due to the material growth or shrinkage on curing the impregnating resin which can be different in X, Y and Z directions (where X is the flow field direction, Y is perpendicular to the flow field direction in the plane of the plate and Z is perpendicular to the plane of the plate).
  • the dimensional change of the material is influenced by the geometry of the flow channels, such that very small differences in the cross-section of the channels can cause significant differences in how the part if finally dimensioned. If the plates are made of metal the issues are similar, such that the differential dimensional changes of the fuel and oxidant plates may result in a finished plate assembly with misaligned channels and a distorted profile.
  • 2002/0168561 describes a fuel cell unit comprising two plates having a similar channel region, offset from the geometric center of the plate, and a membrane electrode assembly (MEA) interposed between the plates, whereby the plates are arranged such that the forces acting on the stack are transmitted to the MEA without any flexural moment. Any damage to the MEA is thereby prevented.
  • the stack operates without any coolant circulation and it does not address the problem of reactant channels misalignment.
  • a flow field plate for a fuel cell comprising: a first planar flow field plate having a surface with open channels, having a first channel cross-section and an opposite surface with open channels having a second channel cross-section with a larger area than the first channel cross-section; and a second flow field plate being essentially the same as the first flow field plate, wherein the surface of the first flow field plate with open channels with a larger cross-sectional area engages the surface of the second flow field plate with open channels of a smaller cross-sectional area to define a closed coolant flow field.
  • the cross-section of the plates is essentially identical and therefore they deform essentially in the same way during molding.
  • the first cross-section and the second cross-section of the open channels may be curvilinear or polygonal.
  • the first flow field plate and the second flow field plate may be made of a moldable material.
  • the flow field plates are made of graphite or expanded graphite that can also be impregnated with a resin material.
  • the resin material may be, for example, a methacrylate, an epoxy or a phenolic resin.
  • the flow field plates are made of metal.
  • the first flow field plate may be the anode plate such that the open channels of a smaller cross-section are used for fuel circulation and the open channels of a larger cross-section are used for coolant circulation.
  • the second flow field plate is the cathode plate such that the open channels of a larger cross-section are used for the oxidant circulation and the open channels of a smaller cross-section are used for the coolant circulation.
  • the surface of the first flow field may slidably engage the surface of the second flow field plate.
  • slidingably is defined to mean that the engagement of the two plates allows some relative movement between them during the fuel cell stack operation. Such movement may be caused by the stack expansion during manufacturing or by the vibrations transferred to the stack from the fuel cell system.
  • a method of engaging the surfaces of the two plates making the flow field plate assembly is also presented.
  • Figure 1 is an exploded view of a conventional fuel cell unit, showing one membrane electrode assembly and the corresponding flow field plates in conformity to the prior art.
  • Figure 2 is a sectional view of a conventional flow field plate assembly showing the possible reactant channel misalignments caused by the residual deformation of the plates after manufacturing.
  • Figure 3 is a sectional view of one embodiment of the flow field assembly with plates made of graphite.
  • Figure 4 is a sectional view of another embodiment of the flow field assembly with plates made of metal.
  • FIG. 1 illustrates a conventional (prior art) fuel cell unit.
  • a single cell, from the fuel cell stack is represented. It is to be understood that this represents a repeating unit of the fuel cell stack.
  • This repeating unit 1 includes a membrane electrode assembly (MEA) 2 interposed between a flow field plate 3 and a flow field plate in an adjacent unit (not shown), similar to plate 4.
  • the MEA comprises a solid polymer ion exchange membrane 5 sandwiched between an anode 6 and a cathode 7.
  • the anode 6 and cathode 7 each contain a fluid diffusion layer 8 and 9, respectively, and a catalyst layer 10, 11, respectively, on the respective sides facing membrane 5.
  • Fluid distribution layers 8 and 9 serve as electrically conductive backings and mechanical supports for catalyst layers 10, 11, and also serve to distribute the reactants from the flow field plates to the catalyst layer.
  • the reactants typically hydrogen and oxygen or oxygen-containing air, are supplied to flow field plates 3 and 4 and then delivered through the fluid distribution channels 13 and 12 of the flow fields to the surfaces of the fluid distribution layers 8 and 9.
  • flow field plate 4 contains channels 14 on the side facing flat surface 15 of flow field plate 3. The cooperating sides of channel 14 and flat surface 15 form a closed inner flow field for carrying a coolant fluid, typically water.
  • the flow field plate assembly 16 shown in Figure 2(a) includes a first flow field plate 17 provided with open channels on both sides, and a second flow field plate 18 also provided with open channels on both sides, such that the cooperating sides of the plates form an inner flow field 19 for carrying a coolant fluid.
  • the fuel cell unit 20, according to one embodiment shown in Figure 3, includes a flow field plate assembly 21 and a MEA 22.
  • the flow field plate assembly 21 includes a first flow field plate 23 having a surface 24 with open channels 25 having a first channel cross-section, and an opposite surface 26 with open channels 27 having a second channel cross-section of a larger area than the first channel cross-section.
  • the flow field plate assembly 21 further includes a second flow field plate 28, essentially the same as the first flow field plate.
  • Surface 29 of the second flow field plate having open channels 30 of a smaller cross-sectional area engages surface 26 of the first flow field plate with open channels of a larger cross-sectional area and thereby defines a closed coolant flow field 31.
  • the first flow field plate may be the anode plate and, consequently, the second flow field plate will be the cathode plate, as illustrated in Figure 3, such that the fuel circulates through the open channels 25 of a smaller cross-section, and the oxidant circulates through the open channels 33 of a larger cross-section.
  • the fuel cell stack is made of a succession of fuel cells similar to the fuel cell unit illustrated in Figure 3 assembled together using tie rods that go through the plates and ensure their alignment. Tie rods or straps are also used to ensure the compression of the fuel cell for a good electrical contact between the plates and the electrodes.
  • Tie rods or straps are also used to ensure the compression of the fuel cell for a good electrical contact between the plates and the electrodes.
  • Seals or glue 34 may be placed between plates 23 and 28, and/or seals or glue 35 between the flow field plate assembly 21 and the MEA 22, to ensure a good sealing between the fuel cell components.
  • the cross-section of the open channels of plates 23 and 28 is curvilinear.
  • the shape of this cross-section may vary such that in alternate embodiments, the cross-section may be polygonal or of any other shape that would allow a smooth fluid movement along the channels and is compatible with the manufacturing methods appropriate to the plate material.
  • plates 23 and 28 are made of graphite. Impregnated graphite may be used as the material for manufacturing the plates in this case.
  • Graphite plates may be impregnated with a methacrylate, an epoxy or a phenolic resin or any other suitable resin material. The resin is cured before plate assembly. In other embodiments the plates may be manufactured from any moldable material.
  • plates 35 and 36 of flow field plate assembly 21 may be made of metal.
  • Plate 35 has a surface 37 defining open channels 38 having a first channel cross-section, and an opposite surface 39 defining open channels 40 having a second channel cross-section of a larger area than the first channel cross-section.
  • the second flow field plate 36 is essentially the same as the first flow field plate 35.
  • Surface 41 of the second flow field plate with open channels 42 of a smaller cross- sectional area engages surface 39 of the first flow field plate with open channels 40 of a larger cross-sectional area, and thereby defines a closed coolant flow field 43.
  • Fuel cell unit 20 represents a repeating unit of the fuel cell stack, such that surface 37 of the flow field plate 35 engages the MEA of the neighboring fuel cell (not illustrated). It is to be understood that seals between the plates and between the flow field plate assembly and the MEA may be used in this embodiment, even if not illustrated in Figure 4. As a person skilled in the art may appreciate, they may be different in shape and composition from the seals used in the first embodiment in order to be compatible with the plate material.
  • a method of making a flow field plate assembly with reduced residual deformation comprises the step of engaging a first flow field plate having open channels of a first cross-section on one surface and open channels of a second cross-section of a larger area than the first cross-section on the opposite surface of the plate with a second flow field plate that is essentially the same as the first flow field plate, such that the surface of the first flow field plate with channels of a larger cross- sectional area engages the surface of the second flow field plate with channels of a smaller cross-sectional area to define a closed coolant flow field.
  • the flow field plate assembly shown in Figure 3 and Figure 4 comprises two plates that are essentially the same, having essentially the same flow field, that are engaged with one another on the surfaces that have open channels of different cross-sectional area.
  • the cross-section of the plates is essentially identical and therefore they deform essentially in the same way during molding.
  • the first flow field plate could be the anode or the cathode plate, allowing the fuel or the oxidant flow through the channels of a smaller cross- section depending on the required pressure drop across the fuel or oxidant flow field, the preferred flow field design (straight, serpentine or any other layout) and the fuel cell system conditions (dead-ended or partially dead-ended operation or hydrogen or oxidant recirculation).

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

Abstract

L'invention concerne un ensemble de plaques de champ d'écoulement pour pile à combustible comprenant une première plaque et une seconde plaque, essentiellement identique à la première plaque, chacune pourvue de canaux de champ d'écoulement ouverts, d'une première section sur un côté, et avec des canaux de champ d'écoulement ouverts d'une seconde section, plus grande que la première section, sur l'autre côté, et s'accouplant les uns les autres pour former une boucle fermée de fluide de refroidissement. L'ensemble de plaques réduit les effets de la déformation résiduelle des plaques qui apparaît habituellement après fabrication sur le réactif et alignement des canaux du fluide de refroidissement. La déformation résiduelle de plaque est la même et, en raison de l'agencement relatif des plaques pour former l'ensemble de plaques de champ d'écoulement, la déformation d'une plaque est compensée par la déformation résiduelle de l'autre plaque.
PCT/US2008/084224 2007-11-20 2008-11-20 Ensemble de plaques de champ d'écoulement pour pile à combustible WO2009067617A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98939807P 2007-11-20 2007-11-20
US60/989,398 2007-11-20

Publications (1)

Publication Number Publication Date
WO2009067617A1 true WO2009067617A1 (fr) 2009-05-28

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PCT/US2008/084224 WO2009067617A1 (fr) 2007-11-20 2008-11-20 Ensemble de plaques de champ d'écoulement pour pile à combustible

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2639868A1 (fr) * 2012-03-13 2013-09-18 Siemens Aktiengesellschaft Plaque bipolaire ainsi que cellule électrochimique dotée d'une telle plaque bipolaire
FR3016243A1 (fr) * 2014-01-07 2015-07-10 Commissariat Energie Atomique Plaque de guidage d'ecoulement pour pile a combustible
DE102015122264A1 (de) * 2015-12-18 2017-06-22 Volkswagen Ag Bipolarplatte für Brennstoffzellen mit optimiertem Design, Brennstoffzellenstapel mit solchen Bipolarplatten sowie Fahrzeug mit einem solchen Brennstoffzellenstapel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1213780A2 (fr) * 2000-12-11 2002-06-12 Toyota Jidosha Kabushiki Kaisha Empilement de cellules à combustible à électrolyte polymère
US20040157100A1 (en) * 2003-02-10 2004-08-12 Seiji Mizuno Separator passage structure of fuel cell
US20050100771A1 (en) * 2003-11-07 2005-05-12 Gayatri Vyas Low contact resistance bonding method for bipolar plates in a pem fuel cell
US20060046130A1 (en) * 2004-08-25 2006-03-02 Yeh-Hung Lai Flexible bipolar plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1213780A2 (fr) * 2000-12-11 2002-06-12 Toyota Jidosha Kabushiki Kaisha Empilement de cellules à combustible à électrolyte polymère
US20040157100A1 (en) * 2003-02-10 2004-08-12 Seiji Mizuno Separator passage structure of fuel cell
US20050100771A1 (en) * 2003-11-07 2005-05-12 Gayatri Vyas Low contact resistance bonding method for bipolar plates in a pem fuel cell
US20060046130A1 (en) * 2004-08-25 2006-03-02 Yeh-Hung Lai Flexible bipolar plate

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2639868A1 (fr) * 2012-03-13 2013-09-18 Siemens Aktiengesellschaft Plaque bipolaire ainsi que cellule électrochimique dotée d'une telle plaque bipolaire
KR20140140547A (ko) * 2012-03-13 2014-12-09 지멘스 악티엔게젤샤프트 양극 플레이트 및 그러한 양극 플레이트를 포함하는 전기화학 전지
US9595724B2 (en) 2012-03-13 2017-03-14 Siemens Aktiengesellschaft Bipolar plate and electrochemical cell comprising such a bipolar plate
KR101875520B1 (ko) * 2012-03-13 2018-07-06 지멘스 악티엔게젤샤프트 양극 플레이트 및 그러한 양극 플레이트를 포함하는 전기화학 전지
FR3016243A1 (fr) * 2014-01-07 2015-07-10 Commissariat Energie Atomique Plaque de guidage d'ecoulement pour pile a combustible
WO2015104492A1 (fr) * 2014-01-07 2015-07-16 Commissariat à l'énergie atomique et aux énergies alternatives Plaque de guidage d'ecoulement pour pile a combustible
US10170774B2 (en) 2014-01-07 2019-01-01 Commissariat à l'énergie atomique et aux énergies alternatives Flow-guiding plate for a fuel cell
US10680255B2 (en) 2014-01-07 2020-06-09 Commissariat A L'energie Atomique Et Aux Energies Alternatives Flow-guiding plate for a fuel cell
DE102015122264A1 (de) * 2015-12-18 2017-06-22 Volkswagen Ag Bipolarplatte für Brennstoffzellen mit optimiertem Design, Brennstoffzellenstapel mit solchen Bipolarplatten sowie Fahrzeug mit einem solchen Brennstoffzellenstapel

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