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WO2018108548A1 - Plaque bipolaire pour une pile à combustible et pile à combustible - Google Patents

Plaque bipolaire pour une pile à combustible et pile à combustible Download PDF

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Publication number
WO2018108548A1
WO2018108548A1 PCT/EP2017/080966 EP2017080966W WO2018108548A1 WO 2018108548 A1 WO2018108548 A1 WO 2018108548A1 EP 2017080966 W EP2017080966 W EP 2017080966W WO 2018108548 A1 WO2018108548 A1 WO 2018108548A1
Authority
WO
WIPO (PCT)
Prior art keywords
distribution structure
fluid
porous foam
bipolar plate
fuel cell
Prior art date
Application number
PCT/EP2017/080966
Other languages
German (de)
English (en)
Inventor
Helerson Kemmer
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018108548A1 publication Critical patent/WO2018108548A1/fr

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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
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • C22C1/081—Casting porous metals into porous preform skeleton without foaming
    • C22C1/082—Casting porous metals into porous preform skeleton without foaming with removal of the preform
    • 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
    • H01M8/0232—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
    • H01M8/023—Porous and characterised by the material
    • H01M8/0241—Composites
    • H01M8/0245—Composites in the form of layered or coated products
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2207/00—Aspects of the compositions, gradients
    • B22F2207/11—Gradients other than composition gradients, e.g. size gradients
    • B22F2207/17—Gradients other than composition gradients, e.g. size gradients density or porosity gradients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
    • B22F3/1125—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
    • B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
    • B22F7/006—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part the porous part being obtained by foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/04—Inorganic
    • B32B2266/045—Metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/18—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
    • 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

  • the invention relates to a bipolar plate for a fuel cell, which comprises a first distribution structure for distributing a fuel to a first electrode and a second distribution structure for distributing an oxidizing agent to a second electrode, wherein at least one of the distribution structures comprises a porous foam.
  • the invention also relates to a fuel cell, the
  • a fuel cell is a galvanic cell, which is the chemical
  • Reaction energy of a continuously supplied fuel and an oxidizing agent converts into electrical energy.
  • a fuel cell is therefore an electrochemical energy converter.
  • known fuel cells in particular hydrogen (H2) and oxygen (02) in water (H20), electrical energy and heat are converted.
  • proton exchange membrane PEM
  • PEM proton exchange membrane
  • Air oxygen is thereby spatially from the fuel, in particular
  • Proton exchange membrane fuel cells further include an anode and a cathode.
  • the fuel is supplied to the anode of the fuel cell and catalytically oxidized to protons with release of electrons.
  • the protons pass through the membrane to the cathode.
  • the emitted electrons are discharged from the fuel cell and flow through an external circuit to the cathode.
  • the oxidant is supplied to the cathode of the fuel cell and it reacts by absorbing the electrons from the external circuit and protons that have passed through the membrane to the cathode to water. The resulting water is discharged from the fuel cell.
  • the gross reaction is:
  • a plurality of fuel cells can be arranged mechanically one behind the other to form a fuel cell stack and electrically connected in series. For uniform distribution of the fuel to the anode and for uniform distribution of the oxidant to the cathode are
  • the bipolar plates have, for example, channel-like structures for distributing the fuel and the oxidizing agent to the electrodes.
  • the channel-like structures also serve to dissipate the water formed during the reaction.
  • the bipolar plates can also structures for
  • bipolar plates having distribution structures for distributing the fuel to the anode and for distributing the oxidant to the cathode, which have porous foams.
  • the foams have such porosities that the supplied reaction gases and the water formed during the reaction can flow through.
  • the bipolar plate has distribution structures which are made of metallic foam and which serve to introduce the reaction gases into the fuel cell stack and to dissipate the water formed during the reaction.
  • the bipolar plate also has a Distribution structure, which is made of metallic foam and which serves to pass a cooling liquid.
  • a bipolar plate for a fuel cell which comprises a first distribution structure for distributing a fuel to a first electrode and a second distribution structure for distributing an oxidizing agent to a second electrode. At least one of the distribution structures has a porous foam.
  • the separating layer is impermeable to the gaseous fuel supplied to the fuel cell, to the gaseous oxidizing agent supplied to the fuel cell, and to the water to be drained from the fuel cell.
  • the foam of the distribution structure is therefore porous in an inner region and thus fluid-permeable and has on the top surface of said fluid-tight separation layer.
  • a foam is, for example, by a powder metallurgical
  • Manufacturing process can be produced.
  • a metal powder and a blowing agent are first mixed together.
  • This is followed by a two-stage compaction and a heat treatment.
  • the result is a foam with a fluid-tight separation layer.
  • This separation layer is about 10 to 100 ⁇ thick.
  • Such a foam is also by a melt metallurgical
  • a porous shaped body is created as a placeholder made of, for example, polyurethane or similar material.
  • the placeholder is formed in such a way that an open-porous space is created in its interior, and some sides are completely free of the placeholder material.
  • a liquid casting compound is, for example, a molten metal. The potting compound penetrates into the open-pore space or into the free side spaces of the shaped body and, after solidification, forms the open-pore foam or the fluid-tight separating layers, which
  • the placeholder material is then removed by rinsing or burning away.
  • the porous foam with the fluid-tight separating layer is preferably provided in the second distribution structure, which is used to distribute the
  • Oxidizing agent to the second electrode and for the derivation of water formed in the reaction can also be provided in the first distribution structure for distributing a fuel to the first electrode.
  • the at least one distribution structure which has the foam, is cuboidal.
  • one of the top surface opposite bottom surface of the distribution structure is formed fluid-permeable. Through the fluid-permeable bottom surface, the fuel or the oxidizing agent can reach the electrode. If, due to the manufacturing process of the foam, all surfaces are fluid-tight
  • two opposing side surfaces of the cuboid distribution structure are each completely of a fluid-tight
  • opposite end faces of the cuboid distribution structure each partially formed by a fluid-tight separation layer, wherein the fluid-tight separation layers are formed integrally with the porous foam.
  • End faces also have fluid-permeable areas to the inlet and the Outlet of the fuel, the oxidizing agent and the derived
  • the third distribution structure is also cuboid and has a porous foam.
  • the third distribution structure is arranged in the bipolar plate such that a
  • Covering surface of the first distribution structure faces, and that one of the
  • the third top surface of the third distribution structure which faces the first distribution structure, and the third bottom surface of the third
  • Distribution structure which faces the second distribution structure, each completely formed by a fluid-tight separation layer, wherein the fluid-tight separation layers are formed integrally with the porous foam.
  • the fluid-tight separating layers are impermeable in particular for the coolant to be passed through.
  • two opposing third side surfaces of the third distribution structure are each also completely formed by a fluid-tight separation layer, the fluid-tight separation layers being integral with the porous one
  • Each of the third and third distribution faces of the third distribution structure is partially formed by a fluid-tight separation layer, wherein the fluid-tight
  • Separating layers are integrally formed with the porous foam.
  • the third end faces also have fluid-permeable areas to the inlet and to the outlet of the coolant.
  • the third cover surface of the third distribution structure is integrally connected to the first cover surface of the first distribution structure.
  • the third bottom surface of the third distribution structure is preferably with the second Cover surface of the second distribution structure cohesively connected.
  • the porous foam of the first distribution structure and the porous foam of the second distribution structure and the porous foam of the third distribution structure are made of a metallic material. This is the
  • Distribution structures electrically conductive.
  • the at least one membrane electrode unit having a first electrode and a second electrode, which are separated from each other by a membrane, and at least one
  • Bipolar plate according to the invention comprises.
  • the fuel cell is constructed in such a way that in each case a bipolar plate adjoins the membrane electrode unit on both sides.
  • the bipolar plate according to the invention has excellent electrical and thermal conductivity. Also, the production of the distribution structures of integrally formed foam with fluid-tight separating layer is relatively simple and inexpensive to carry out. Also is a coating for
  • FIG. 1 shows a schematic representation of a fuel cell stack with a plurality of fuel cells
  • Figure 2 shows two sectional views of a first distribution structure for
  • Figure 3 shows two sectional views of a second distribution structure for
  • Figure 4 shows two sectional views of a third distribution structure for
  • Figure 5 is a sectional view of a bipolar plate of
  • FIG. 1 shows a schematic representation of a fuel cell stack 5 with a plurality of fuel cells 2.
  • Each fuel cell 2 has a membrane electrode unit 10 which comprises a first electrode 21, a second electrode 22 and a membrane 18.
  • the two electrodes 21, 22 are arranged on mutually opposite sides of the membrane 18 and thus separated from each other by the membrane 18.
  • the first electrode 21 will also be referred to below as the anode 21 and the second electrode 22 will also be referred to below as the cathode 22.
  • the membrane 18 is formed as a polymer electrolyte membrane.
  • the membrane 18 is permeable to hydrogen ions, ie H + ions.
  • Each fuel cell 2 also has two bipolar plates 40, which adjoin the membrane electrode unit 10 on both sides. In the arrangement of multiple fuel cells 2 shown in the fuel cell stack 5 shown here, each of the bipolar plates 40 may be arranged as being adjacent to each other
  • Fuel cell 2 are considered properly.
  • the bipolar plates 40 each comprise a first distribution structure 50 for
  • the bipolar plates 40 each also include a second distribution structure 60 for distributing the
  • the second distribution structure 60 simultaneously serves to dissipate water formed in a reaction in the fuel cell 2.
  • the bipolar plates 40 further include a third distribution structure 70 disposed between the first distribution structure 50 and the second distribution structure 60.
  • the third distribution structure 70 serves to pass a
  • fuel is conducted via the first distribution structure 50 to the anode 21.
  • oxidizing agent is via the second
  • Distributed structure 60 passed to the cathode 22.
  • the fuel present
  • Hydrogen is catalytically oxidized at the anode 21 with the emission of electrons to protons.
  • the protons pass through the membrane 18 to the cathode 22.
  • the emitted electrons flow through the distribution structures 50, 60, 70 to the cathode 22 of the adjacent fuel cell 2, or from the anode 21 of the peripheral fuel cell 2 via an external circuit the cathode 22 located at the other edge
  • Fuel cell 2 The oxidizing agent, in the present case atmospheric oxygen, reacts by taking up the thus conducted electrons and the protons, which through the
  • Membrane 18 have come to the cathode 22, to water.
  • FIG. 2 shows two sectional representations of a first distribution structure 50 for distributing a fuel to the anode 21.
  • the first distribution structure 50 has a cuboid shape and has a first cover surface 52, a opposite first bottom surface 53, two opposing first side surfaces 54 and two opposing first end surfaces 55 on.
  • the first side surfaces 54 and the first end faces 55 extend at right angles to each other and at right angles to the first cover surface 52 and the first bottom surface 53.
  • the first distribution structure 50 comprises a porous foam 80 made of a metallic material.
  • the first cover surface 52 and the first side surfaces 54 are each completely formed by a fluid-tight separation layer 82.
  • the fluid-tight separation layers 82 are integral with the porous
  • Foam 80 is formed.
  • the first bottom surface 53 is free of a fluid-tight separating layer 82 and thus formed fluid-permeable.
  • the first end faces 55 are each partially formed by a fluid-tight separating layer 82 integrally formed with the porous foam 80.
  • One of the first end faces 55 has a fluid-permeable first
  • Inlet region 56 which is free of a fluid-tight separation layer 82.
  • the other of the first end faces 55 has a fluid-permeable first
  • Outlet region 57 which is free of a fluid-tight separation layer 82.
  • the first outlet region 57 is arranged such that an optimum flow of the fuel is possible with respect to the first inlet region 56.
  • first inlet region 56 and the first outlet region 57 are arranged at diagonally opposite corners of the first distribution structure 50.
  • the first inlet region 56 serves to introduce the fuel.
  • the first outlet region 57 serves to discharge unneeded fuel.
  • the fuel flows in a first flow direction 51 through the first
  • FIG. 3 shows two sectional representations of a second distribution structure 60 for distributing an oxidizing agent to the cathode 22.
  • the second distribution structure 60 has a cuboid shape and has a second cover surface 62, one opposite second bottom surface 63, two opposing second side surfaces 64 and two opposing second end surfaces 65 on.
  • the second side surfaces 64 and the second end surfaces 65 extend at right angles to each other and at right angles to the second cover surface 62 and the second bottom surface 63.
  • the second distribution structure 60 comprises a porous foam 80 made of a metallic material.
  • the second cover surface 62 and the second side surfaces 64 are each completely formed by a fluid-tight separation layer 82.
  • the fluid-tight separation layers 82 are formed integrally with the porous foam 80.
  • the second bottom surface 63 is free of a fluid-tight separating layer 82 and thus fluid-permeable.
  • the second end surfaces 65 are each partially formed by a fluid-tight separation layer 82 integrally formed with the porous foam 80.
  • One of the second end faces 65 has a fluid-permeable second
  • Inlet region 66 which is free of a fluid-tight separation layer 82.
  • the other of the second end faces 65 has a fluid-permeable second outlet region 67, which is free of a fluid-tight separating layer 82.
  • the second outlet region 67 is arranged such that an optimal flow of the oxidizing agent is possible relative to the second inlet region 66.
  • the second inlet region 66 and the second outlet region 67 are arranged at diagonally opposite corners of the second distribution structure 60.
  • the second inlet region 66 serves to introduce the oxidizing agent.
  • the second outlet area 67 serves for the discharge of unneeded
  • FIG. 4 shows two sectional representations of a third distribution structure 70 for the passage of a coolant.
  • the third distribution structure 70 is of cuboid shape and has a third cover surface 72, an opposite third bottom surface 73, two opposing third side surfaces 74 and two opposing third end surfaces 75.
  • the third side surfaces 74 and the third end surfaces 75 extend at right angles to each other and at right angles to the third cover surface 72 and the third bottom surface 73.
  • the third distribution structure 70 comprises a porous foam 80 made of a metallic material.
  • Bottom surface 73 and the third side surfaces 74 are each completely formed by a fluid-tight separation layer 82.
  • the fluid-tight separation layers 82 are formed integrally with the porous foam 80.
  • the third end surfaces 75 are each partially formed by a fluid-tight separation layer 82 integrally formed with the porous foam 80.
  • the one of the third end faces 75 has a third fluid-permeable
  • Inlet region 76 which is free of a fluid-tight separation layer 82.
  • the other of the third end faces 75 has a third fluid-permeable one
  • Outlet region 77 which is free of a fluid-tight separation layer 82.
  • the third inlet region 76 serves to introduce the coolant.
  • the third outlet region 77 serves to discharge the coolant.
  • the coolant flows in a third flow direction 71 through the third inlet region 76 into the third distribution structure 70. From there, the coolant flows out of the third distribution structure 70 through the third outlet region 77.
  • FIG. 5 shows a cutaway view of a bipolar plate 40 of FIG
  • the bipolar plate 40 has the first distribution structure 50 shown in Figure 2, the second shown in Figure 3
  • the third cover surface 72 of the third distribution structure 70 faces the first distribution structure 50.
  • the third bottom surface 73 of the third distribution structure 70 faces the second distribution structure 60.
  • the first top surface 52 of the first Distribution structure 50 faces the second distribution structure 60 and the third distribution structure 70.
  • the second cover surface 62 of the second distribution structure 60 faces the first distribution structure 50 and the third distribution structure 70.
  • the third top surface 72 of the third distribution structure 70 is with the first
  • the third bottom surface 73 of the third distribution structure 70 is materially connected to the second top surface 62 of the second distribution structure 60.

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

Abstract

L'invention concerne une plaque bipolaire (40) pour une pile à combustible, comprenant une première structure distributrice (50) pour la distribution d'un combustible à une première électrode et une deuxième structure distributrice (60) pour la distribution d'un milieu d'oxydation à une deuxième électrode, au moins une des structures distributrices (50, 60) comportant une mousse poreuse (80). À cet effet, une surface couvrante (52, 62) de la structure distributrice (50, 60) comportant la ou les mousses poreuses (80), laquelle est tournée vers l'autre structure distributrice (50, 60), est constituée complètement d'une couche séparatrice (82) étanche aux fluides, laquelle est réalisée d'un bloc avec la mousse poreuse (80). L'invention concerne également une pile à combustible qui comprend au moins une unité membrane-électrodes comportant une première électrode et une deuxième électrode, lesquelles sont séparées l'une de l'autre par une membrane, et qui comprend au moins une plaque bipolaire (40) selon l'invention.
PCT/EP2017/080966 2016-12-12 2017-11-30 Plaque bipolaire pour une pile à combustible et pile à combustible WO2018108548A1 (fr)

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DE102016224688.7A DE102016224688A1 (de) 2016-12-12 2016-12-12 Bipolarplatte für eine Brennstoffzelle und Brennstoffzelle

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WO2019048340A1 (fr) * 2017-09-05 2019-03-14 Robert Bosch Gmbh Pile à combustible à robustesse améliorée

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Publication number Priority date Publication date Assignee Title
EP3644421A1 (fr) 2018-10-25 2020-04-29 Ecole Polytechnique Federale De Lausanne (EPFL) EPFL-TTO Réacteur électrochimique

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US3711363A (en) * 1970-04-21 1973-01-16 Ethyl Corp Foamed core sandwich construction
EP0963614A2 (fr) * 1997-01-24 1999-12-15 Lynntech, Inc. Plaques bipolaires pour piles de cellules electrochimiques
EP1323201B1 (fr) * 2000-09-15 2004-08-04 Lynntech, Inc. Liaison de composants de cellules electrochimiques
FR2921281A1 (fr) * 2007-09-26 2009-03-27 C T I F Ct Tech Des Ind De La Preforme et procede pour la fabrication d'une mousse de metal ou d'alliage.
DE102013223776A1 (de) 2013-11-21 2015-05-21 Robert Bosch Gmbh Separatorplatte für einen Brennstoffzellenstapel
DE102013226815A1 (de) * 2013-12-20 2015-06-25 Robert Bosch Gmbh Brennstoffzelle
DE102015224189A1 (de) * 2015-12-03 2017-06-08 Bayerische Motoren Werke Aktiengesellschaft Herstellungsverfahren für eine Bipolarplatte für Brennstoffzellen

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Publication number Priority date Publication date Assignee Title
US3711363A (en) * 1970-04-21 1973-01-16 Ethyl Corp Foamed core sandwich construction
EP0963614A2 (fr) * 1997-01-24 1999-12-15 Lynntech, Inc. Plaques bipolaires pour piles de cellules electrochimiques
EP1323201B1 (fr) * 2000-09-15 2004-08-04 Lynntech, Inc. Liaison de composants de cellules electrochimiques
FR2921281A1 (fr) * 2007-09-26 2009-03-27 C T I F Ct Tech Des Ind De La Preforme et procede pour la fabrication d'une mousse de metal ou d'alliage.
DE102013223776A1 (de) 2013-11-21 2015-05-21 Robert Bosch Gmbh Separatorplatte für einen Brennstoffzellenstapel
DE102013226815A1 (de) * 2013-12-20 2015-06-25 Robert Bosch Gmbh Brennstoffzelle
DE102015224189A1 (de) * 2015-12-03 2017-06-08 Bayerische Motoren Werke Aktiengesellschaft Herstellungsverfahren für eine Bipolarplatte für Brennstoffzellen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019048340A1 (fr) * 2017-09-05 2019-03-14 Robert Bosch Gmbh Pile à combustible à robustesse améliorée

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