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EP1396039A2 - Pile a combustible et procede de fabrication associe - Google Patents

Pile a combustible et procede de fabrication associe

Info

Publication number
EP1396039A2
EP1396039A2 EP02751015A EP02751015A EP1396039A2 EP 1396039 A2 EP1396039 A2 EP 1396039A2 EP 02751015 A EP02751015 A EP 02751015A EP 02751015 A EP02751015 A EP 02751015A EP 1396039 A2 EP1396039 A2 EP 1396039A2
Authority
EP
European Patent Office
Prior art keywords
support structure
anode
fuel cell
electrolyte
wires
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.)
Withdrawn
Application number
EP02751015A
Other languages
German (de)
English (en)
Inventor
Franz-Josef Wetzel
Rudolf Henne
Erich Bittner
Ralf Rauenbusch
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.)
Bayerische Motoren Werke AG
Rhodius GmbH
Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Bayerische Motoren Werke AG
Rhodius GmbH
Deutsches Zentrum fuer Luft und Raumfahrt eV
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 Bayerische Motoren Werke AG, Rhodius GmbH, Deutsches Zentrum fuer Luft und Raumfahrt eV filed Critical Bayerische Motoren Werke AG
Priority to EP03026862A priority Critical patent/EP1455404A2/fr
Publication of EP1396039A2 publication Critical patent/EP1396039A2/fr
Withdrawn legal-status Critical Current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
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8882—Heat treatment, e.g. drying, baking
    • H01M4/8885—Sintering or firing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8605—Porous electrodes
    • H01M4/8621—Porous electrodes containing only metallic or ceramic material, e.g. made by sintering or sputtering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • H01M4/9041—Metals or alloys
    • H01M4/905—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC
    • H01M4/9066—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC of metal-ceramic composites or mixtures, e.g. cermets
    • 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
    • H01M8/0236—Glass; Ceramics; Cermets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • 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
    • 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

  • Fuel cells are known to be electrochemical energy converters that convert chemical energy directly into electrical current.
  • the so-called single (fuel) cells are continuously supplied with fuel on an anode side and oxygen or air on a cathode side.
  • the basic principle is characterized by the spatial separation of the reactants by an electrolyte, which is conductive for ions or protons, but not for electrons.
  • the oxidation and reduction reactions take place at different locations, namely on the anode on the one hand and on the cathode on the other, the electron exchange thus caused between the oxidizing agent and the reducing agent taking place via an external circuit.
  • the fuel cell is part of a circuit.
  • the individual cells are connected to one another by means of electrically conductive end or intermediate plates (so-called bipolar plates) and combined to form a stack (so-called stack).
  • bipolar plates electrically conductive end or intermediate plates
  • stack stack
  • the gaseous reactants are distributed on the electrode surfaces of the reaction layers via grooves milled into the bipolar plates. The production of these milling grooves is very expensive.
  • fuel cells produced in this way have a relatively low weight-specific and volume-specific power density owing to the large-area covering of the reaction layers and the associated impediments to mass transfer.
  • a fuel cell construction is known in which the cathode-electrolyte-anode layers which form the named CEA are applied to a porous solid substrate which serves as a carrier layer.
  • thermomechanical stresses occur during operation which result from different thermal expansions of the cathode, electrolyte and anode layers on the one hand and the porous solid substrate on the other hand.
  • different reaction temperatures occur due to different reaction speeds over a single carrier layer plate, which likewise led to thermomechanical stresses.
  • thermomechanical voltages there can be considerable functional impairments as a result of damage to the individual cell. This problem is exacerbated, in particular, when such a fuel cell is used in the automotive field, in which additional stresses from vibrations occur during a journey.
  • the object of the present invention is therefore to specify a fuel cell and a method for its production, in which or with which the aforementioned problems can be eliminated and an economical method of production can be ensured. This object is achieved by the features mentioned in claims 1 or 3 and 14.
  • a key concept of the present invention is the use of a supporting structure constructed from metal wire or metal wires for a single fuel cell on which the anode-electrolyte-cathode unit is applied.
  • a support structure consisting of wires (and thus naturally porous), which can preferably be in the form of a metallic knitted fabric, but also in the form of a metallic knitted fabric or woven or braided fabric, brings considerable advantages in a wide variety of areas.
  • a main advantage is a certain freedom of movement in all three dimensions, which is why such a support structure then has three-dimensional elasticity and mobility.
  • CEA cathode-electrolyte-anode coating
  • gradations in the different expansion directions or flow directions can be achieved by a suitable structure and in particular by a locally different design of the support structure, which means that the fluid flowing through occurs in different areas and / or different directions different flow resistance can be opposed.
  • the (free) flow cross sections in the supporting structure can be deliberately different in wide areas. Different flow velocities are then set in different areas of the support structure.
  • the reaction behavior can be specifically adjusted over the active surface of the CEA unit. For example. can be ensured that in the feed area of the single fuel cell, in which a large amount of fresh reaction fluid is available, the reactivity is dampened by this reaction fluid having a relatively high flow rate in a to the active surface of the CEA unit parallel direction is impressed and / or in that the reaction fluid is opposed to a relatively high flow resistance in a flow direction running towards the CEA unit.
  • the reactivity can be increased by a relative to this reaction fluid low flow velocity is impressed in a direction parallel to the active surface of the CEA unit and / or in that the reaction fluid is opposed to a relatively low flow resistance in a flow direction running towards the CEA unit.
  • the support structure or the knitted fabric or the like can be “graded” in its thickness direction, in which case the free or effective flow cross section within the support structure or the knitted fabric increases
  • the cathode-electrolyte-anode unit decreases, for example by changing the mesh size in the knitted fabric and / or the thickness of the wire forming the supporting structure, the component density, the mesh shape, the loop curvature in the knitted fabric or the like and / or
  • the knitting process can be adapted accordingly, so that the wires are suitable or specifically knitted together with respect to the desired so-called “grading”.
  • supporting structure or “knitted fabric” always stand for a porous supporting structure according to the invention for the CEA unit of a single fuel cell, which is composed of one or more metallic wires in the form of a knitted fabric or knitted fabric or braid or fabric.
  • grading in the tag structure ie to the locally different flow resistances for the reaction fluid
  • Such a change in the free or effective flow cross section in the direction of flow of the reactants and reaction products can achieve a homogenization of the material conversions and the release of energy, since, for example, a flow expansion in the direction of flow compensates for the effects of poorer media due to the decrease in speed resulting in longer reaction times can be.
  • the grading i.e.
  • the change in flow cross-section, in the direction of the later flow direction of a reactant can be achieved by appropriate formation of the (e.g.) knitted fabric, i.e. by different mesh sizes, wire thickness, component density, mesh shape, loop curvature and / or surface properties of the wires.
  • Suitable channels can also be formed in the knitted fabric or in the supporting structure, the free channel cross section of which changes over the channel length, which means that there are so-called diverging (alternatively converging) channels. If these channels are provided on the surface of the support structure, it is possible to bring about the different flow conditions mentioned by stamping or pressing (profiling) corresponding channels onto or into the support structure. This stamping or pressing in of channels on the surface of the supporting structure can take place, for example, by means of stamping or rolling.
  • the wires of the supporting structure can consist of nickel, ferritic or austenitic alloys and of a material that contains these elements or alloys.
  • NiFe22, Inconel, FeCrAloy or stainless steel can be used.
  • the material nickel namely improves the reaction kinetics of the (in the finished fuel single cell) anode of the above-mentioned CEA which rests on the supporting structure.
  • the wires can be coated with a corrosion-resistant material in order to prevent corrosion by the gaseous reactants even in high-temperature fuel cells.
  • wires made of different materials for example different wires can be connected to or in the support structure are put together and, for example, are suitably arranged locally with regard to their effect on the reactions taking place.
  • a particularly preferred method for applying the cathode-electrolyte-anode layer (s) to the support structure is a thermal coating method.
  • a flame spraying process simple flame spraying; high velocity oxygen flame spraying
  • a plasma spraying process atmospheric plasma spraying, vacuum plasma spraying, low pressure plasma spraying
  • the plasmas can be generated, for example, by means of a direct voltage or by inductive high-frequency excitation, it being possible to use powders, suspensions, liquid and / or gaseous starting materials to generate the layer.
  • the plasma sources can be provided with high-speed nozzles, it then being possible to produce very dense layers at a reactor pressure in the range below 1 bar, for example between 50 and 300 mbar ,
  • the structure of the coating for the anode-electrolyte-cathode unit can be started with the anode on a knitted fabric side or support structure side, the knitted fabric or the Support structure in this area can be slightly pre-compressed or otherwise pretreated, as will be explained in more detail below.
  • nickel or a NiAI alloy mixed with ZrO 2 can serve as the anode base material.
  • the aluminum can then be removed, for example with a potassium hydroxide solution, so that a firmly bonded, highly conductive, highly porous nickel-ZrO 2 composite layer is formed.
  • anode base layer or so-called cover layer can be applied as the first layer on which the actually active anode is then applied, with nickel, a nickel, again for the anode base layer or cover layer Alloy or a nickel aluminum alloy can be used.
  • the electrolyte layer can then be applied to the suitably applied first electrode layer (this is the anode layer according to the previous description) and then the second electrode layer (this is the cathode layer according to the previous description), after which a complete anode electrolyte layer can be applied.
  • Cathode unit is located on the knitted fabric. It is expressly pointed out that the cathode layer of this so-called CEA can also be applied to the knitted fabric as the first layer, then the electrolyte layer and finally the anode layer can be applied to this.
  • the knitted side concerned can or should be prepared beforehand in order to prevent the electrode material from penetrating too far into the knitted fabric and clogging it .
  • So-called “spray blocking”, “jet braking” or “jet stopper” can be used for this purpose.
  • These designations are all aimed at measures in which on or in the area of the knitted fabric surface or support structure surface on which the anode (possibly also the cathode) is applied, a layer is arranged which prevents the knitted fabric or the supporting structure from spraying or radiating in.
  • additional wires can be woven in, for example, near the surface of the knitted fabric or the supporting structure , braided or knitted in, which consist of a detachable material so that they can be removed later.
  • material for such wires for example, aluminum is suitable, which can be washed out again with the use of potassium hydroxide solution.
  • spray barrier Wires are made of carbon, which is at an elevated temperature , e.g. using oxygen or hydrogen, i.e. can almost be burned out.
  • a so-called jet stopper or pointed blocker it is also possible, as a so-called jet stopper or pointed blocker, to introduce a suitable, for example pasty, filler material on the side of the knitted fabric (or the like) facing the anode-electrolyte-cathode unit, which may or may not be dried or cured and after application of the electrode layer (s) burned out or removed in another suitable manner.
  • This filling mass which virtually forms a cover layer, can be formed, for example, by a so-called slurry (this is a slurry material, similar to a slurry plaster), for example on a graphite basis, because of the possibility of burning out.
  • a pasty filler can also be used, particularly in the area of the coarse knitted structure or porous support structure according to the invention.
  • a ceramic filling compound can also be washed out again after the production of the single cell.
  • a preferred embodiment is characterized in that the support structure is placed on a dense, uncoatable substrate and is irradiated from the opposite side using a thermal spray process, so that deposition takes place in the area of the dense substrate or a so-called cover layer is formed in the support structure ,
  • This method has the advantage that an anode material can already be used as the radiation material, so that later removal of a jet brake is no longer necessary.
  • a graphite foil can also be used as a “spray barrier” or “jet brake”, which is inserted (for example rolled in) into the first layer of knitted fabric, the electrical contact between an electrode and the uppermost wire loops or wire areas being ensured eg can be brushed free.
  • the support structure can be stretched over a convex surface when applying the electrode material by the proposed (plasma) spraying method, since then a subsequent straight laying in a Level closes any pores in the surface.
  • the individual adjacent wires forming the support structure can preferably be firmly connected to one another at their contact points. This connection can be made by gluing, soldering, joining or welding. A combination in a suitable furnace at higher temperatures can preferably be carried out under a suitable contact pressure.
  • a just-mentioned welding between the individual wires of the support structure at their respective contact points can be achieved, for example, by resistance welding, in that a current pulse flows through it with the aid of two metallic electrodes on the top and bottom of the support structure.
  • This welding is preferably carried out in a protective gas atmosphere or in a vacuum.
  • Linear electrodes, plates or rollers can be used as welding electrodes.
  • the electrode surfaces should be appropriately designed, for example have corresponding coatings that prevent welding or have the lowest possible contact resistance to the support structure, so that hardly any ohmic heat is released at the contact surface.
  • Such strength-increasing elements can, for example, be metallic wire frames or wire grids.
  • suitable longitudinal wires can also be installed.
  • the wire spacing can be selected, for example, in the range from 0.5 to 20 mm.
  • the edge of the knitted fabric for example, to form a single fuel cell, of which several are then assembled to form a stack, can also be suitably pressed to form a so-called edge strip.
  • the knitted fabric can then - after the anode-electrolyte-cathode unit has been applied to it in the manner described - the side opposite to this unit is welded to the bipolar plate mentioned at the outset (or otherwise suitably connected in a form-fitting or material-locking manner), which has the advantage that then no independent seal between the edge of the knitted fabric and the bipolar plate is required.
  • the knitted fabric or the supporting structure in its entirety can be connected to the bipolar plate by a method that ensures a power line, such as cold welding, welding, soldering or sintering. Such methods are mature for series production and can be optimally used.
  • the said power line ensures that electrical current can not only be generated as desired, but can also be passed on from single cell to single cell.
  • the spaces between the anodes can be close
  • the position of the support structure or the knitted fabric can be filled up with a filling compound mixed with pore formers and preferably with an electrically conductive filling compound, this filling compound then remaining in the knitted fabric or in the supporting structure, ie after the application of the electrode layer (s) - unlike the spray locks or jet brakes explained first - is not removed.
  • a suitable stainless steel paste for example, can be used as such a filling compound, which paste is converted, for example, by sintering into a porous carrier for the (named) CEA electrode unit.
  • a porous cover layer for example made of metallic, ceramic or metallic-ceramic material
  • a porous cover layer for example made of metallic, ceramic or metallic-ceramic material
  • a porous film in particular made of an electrically conductive material, is applied to the anode side of the knitted fabric before the electrode layer is applied, this porosity of the film also only after its application, in particular by mechanical or electrochemical or thermal means (by adding a so-called Pore former is introduced) can be generated.
  • the pores mentioned are (of course) necessary to allow a desired passage of the reactants between the knitted fabric (or generally the supporting structure) and the adjacent electrode layer.
  • the material composition of the support structure can also change locally.
  • This can also be used to control the internal gas reforming on the anode side, which is endothermic and is accomplished in particular by nickel, i.e. Nickel acts as a catalyst.
  • a reduced proportion of nickel surface area in the so-called fuel gas inlet of the fuel cell changes the reforming process and thus the reactivity of the fuel gas in the fuel cell and thus effectively cools down, which locally causes a reduction in the performance of the cell.
  • the structure and material composition of the supporting structure are therefore generally parameters with which the reforming process, the material conversion and the power release of the single fuel cell can be made more uniform.
  • a knitted band or support structure band can first be continuously produced from a single wire, in which the desired so-called gradations for the formation of different local flow resistances (as explained in detail above), as well as the welds or general connections between the individual wires -Crossing points can be realized.
  • the knitted tape (or the like) formed in this way can then be continuously processed further, it being possible for the said anode layers, electrolyte layers and cathode layers to be applied continuously in succession.
  • the individual fuel cells can be made from this so-called fuel cell band by cutting.
  • FIG. 1 shows a schematic partial sectional view through a single fuel cell arranged on a bipolar plate (as section AA from FIG. 2)
  • FIG. 2 shows a plan view of the knitted fabric of this single cell with embossed divergent flow channels (according to section BB from FIG. 1)
  • FIG. 3 shows a schematic illustration of a manufacturing method according to the invention.
  • a bipolar plate 14 which is customary in the design of fuel cells or individual fuel cells.
  • the ceramic solid ZrO 2 can be used as the electrolyte with (Y 2 O 3 ) Stabilization can be used.
  • This electrolyte is conductive for oxygen ions.
  • Ni-YSZ is used for the anode layer.
  • a persoskitic oxide, for example LSM, can be used for the cathode layer.
  • an electrical current flow according to arrows 31 or a corresponding electrical voltage potential can be generated in the single fuel cell as a result of these processes if a suitable fuel gas is used with the anode side (A) of the CEA and with the cathode side (C) of the CEA Air oxygen unit contacted becomes. At least the fuel gas is passed through the knitted fabric 10, specifically in the illustration according to FIG. 1 perpendicular to the plane of the drawing. The fuel gas is thus conducted between the CEA unit and the bipolar plate 14. In FIG. 2, the fuel gas flows into the knitted fabric 10 according to the arrows 24, the so-called fuel gas inlet being located on the (lower) edge 13.
  • the wire 12, from which the knitted fabric 10 is formed consists of a nickel alloy, so that there is corrosion resistance to the reactants introduced (from the fuel gas and from and also against the air).
  • the knitted fabric 10 is both in terms of its thickness or density in the arrow direction 31 towards the CEA layer, i.e. in the direction of movement of the reactants, as well as in the main flow direction of the fuel gas (in FIG. 1 perpendicular to the plane of the drawing, in FIG. 2 according to arrow direction 24) with respect to the flow cross section “graded” such that there is a locally different flow resistance of the knitted fabric 10, the mesh density of the knitted fabric 10 is locally different in order to achieve this so-called grading (which cannot be seen from the figure).
  • the individual wires 12 of the knitted fabric 10 are connected to one another by a welding process or the like , so that the lowest possible electrical resistance for carrying the electrical current (according to arrows 31) is reached.
  • Channels 16 are formed on the (lower) side of the knitted fabric 10 opposite the CEA unit, which run in the flow direction 24 of the fuel gas and thus distribute it better over the entire surface or the entire volume of the knitted fabric 10.
  • Corresponding channels 17 can (as usual) be provided in the surface of the bipolar plate 14 facing the knitted fabric 10. At least the channels 16 formed in the knitted fabric 10, for example by pressing, run - as shown in FIG. 2 - diverging, ie widening in cross-section in the direction of flow 24, so that there is a higher flow velocity in the vicinity of the fuel gas inlet (edge 13) than in the opposite one Outlet area 15 of the single fuel cell.
  • the single fuel cell consisting of the knitted fabric 10 and the CEA unit is arranged on a bipolar plate 14, as has already been explained.
  • a bipolar plate 14 By lining up several such bipolar plates / knitted CEA cells, any stack of individual cells can be built up, which then forms the core area of a fuel cell.
  • a further single cell in FIG. 1 above the single cell shown and the cathode layer C shown in the figure Single cell also a flow channel is formed. This can also be achieved, for example, by means of a knitted insert.
  • a method can be used as described below with reference to FIG. 3. Accordingly, a single continuous wire 12 (alternatively also a plurality of wires at the same time) is introduced into a knitting device 50 and knitted there according to the specifications to form a knitted band 52 which continuously leaves the knitting device 50. Depending on the entanglement, a so-called grading described above can be introduced into the knitted fabric, i.e. a locally different knitted fabric density or the like is generated in order to obtain locally different flow resistances. In addition, the properties of the knitted fabric, particularly in chemical terms, are determined by the nature of the wire.
  • the continuous knitted belt 52 is next fed to a roll unit consisting of an upper roll 53 and a lower roll 54, in which it is rolled.
  • the rollers 53 and 54 have a multiple function.
  • the upper roller 53 thus has embossing dies which are aligned transversely to the direction of passage of the knitted strip 52 and which alternately emboss diverging flow channels (as shown in FIG. 2 under reference number 16) into the knitted strip 10 or knitted strip 52.
  • the two electrically conductive rollers 53 and 54 are also subjected to current, so that when the knitted strip 52 passes through, the wires 12 lying against one another in the knitted fabric 10 are welded. As already mentioned above, this results in a particularly low ohmic resistance within the knitted fabric 10, which has a positive effect on the removal of the electrons from the single fuel cell.
  • the knitted fabric band 52 treated in this way is then passed over a dense substrate 58 and irradiated from the opposite side in a coating process I by means of a plasma spraying process with a compression material or anode material.
  • This anode material settles in the area of the dense substrate 58 on the surface of the knitted fabric 10 or knitted tape 52 in the form of a so-called deposition and thus forms a so-called cover layer 11 (or first surface layer) of the knitted fabric 10 (or 52) (namely on its “underside”), which can advantageously be used at the same time as an anode.
  • this can also be provided with a release agent.
  • the coating process I also takes place continuously.
  • Nickel or a nickel alloy-ZrO 2 mixture can be used as the compression material.
  • a very thin anode layer is applied again, which is applied with the layer previously applied in the coating process I and also as an anode layer Functioning cover layer 11 connects and forms the total anode (see Fig. 1, letter A).
  • the knitting of the knitted band 52 for the coating process II is necessary in order to be able to apply the material again from above after - as has been explained - in the coating process I the material has been introduced through the knitted band 52 into its lower side there.
  • a particularly smooth anode surface can be achieved in coating process II by guiding or tensioning the knitted strip 52 over a convex support surface 62 (in a plane perpendicular to the plane of the drawing), as was also explained above. Overall, a very thin and advantageously smooth anode surface can be achieved with the procedure from process steps I and II.
  • the electrolyte (E, cf. FIG. 1) of the CEA unit is also applied by means of a plasma spraying process and the cathode material (C) in a coating process IV.
  • DC excitation is used in this case, the respective layer material being made available in the form of a powder.
  • All coating processes I, II, III and IV run continuously with a continuously running knitted belt 52. Cleaning steps can also be provided between the individual production steps.
  • the respective thermal spraying processes take place in separate chambers with locks and preferably under a protective gas atmosphere, so that oxidation processes and mutual contamination can be largely avoided.
  • individual single-cell structures can be obtained by assembling the coated knitted strip 52, for example by cutting (for example using a laser or water jet). These individual cells can then be processed into a fuel cell stack. Process steps such as fixing, sealing, contacting etc. are to be carried out.
  • the method according to the invention represents a simple and extremely cost-effective production possibility for individual fuel cell cells, which in turn have particularly favorable properties with regard to thermomechanical stresses due to the design according to the invention and are also particularly suitable for non-stationary use.
  • the protected fuel cell as a component is also not limited to a porous support structure 10 formed from a knitted fabric; rather, woven fabrics, braids or knitted fabrics made of metal wires 12 can also be used for this purpose.

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

Abstract

L'invention concerne une pile à combustible et un procédé de fabrication associé. Pour fabriquer cette pile à combustible, on fabrique d'abord un matériau tissé (10) ou une structure support poreuse similaire, telle qu'un tissage, un maillage ou un grillage formé d'un ou de plusieurs fils métalliques (12). Ensuite, une unité anode-électrolyte-cathode (CEA) y est déposée progressivement par couches. A partir des cellules individuelles, il est alors possible de former un empilement de cellules à combustible, chaque cellule étant séparée des autres par des plaques bipolaires (14). La réalisation de la structure support (10), telle qu'elle est décrite en détail dans la présente invention, permet d'y créer des résistances de courant localement différentes et d'influencer ainsi le déroulement de la réaction dans une cellule à combustible individuelle.
EP02751015A 2001-06-13 2002-06-12 Pile a combustible et procede de fabrication associe Withdrawn EP1396039A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03026862A EP1455404A2 (fr) 2001-06-13 2002-06-12 Pile à combustible et procédé de fabrication

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10128786 2001-06-13
DE10128786 2001-06-13
PCT/EP2002/006453 WO2002101859A2 (fr) 2001-06-13 2002-06-12 Pile a combustible et procede de fabrication associe

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP03026862A Division EP1455404A2 (fr) 2001-06-13 2002-06-12 Pile à combustible et procédé de fabrication

Publications (1)

Publication Number Publication Date
EP1396039A2 true EP1396039A2 (fr) 2004-03-10

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EP02751015A Withdrawn EP1396039A2 (fr) 2001-06-13 2002-06-12 Pile a combustible et procede de fabrication associe
EP03026862A Withdrawn EP1455404A2 (fr) 2001-06-13 2002-06-12 Pile à combustible et procédé de fabrication

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EP03026862A Withdrawn EP1455404A2 (fr) 2001-06-13 2002-06-12 Pile à combustible et procédé de fabrication

Country Status (4)

Country Link
US (1) US20040185326A1 (fr)
EP (2) EP1396039A2 (fr)
JP (1) JP2004529477A (fr)
WO (1) WO2002101859A2 (fr)

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US7575821B2 (en) 2002-06-11 2009-08-18 General Electric Company Interconnect supported fuel cell assembly and preform
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Also Published As

Publication number Publication date
WO2002101859A3 (fr) 2003-05-08
WO2002101859A2 (fr) 2002-12-19
JP2004529477A (ja) 2004-09-24
EP1455404A2 (fr) 2004-09-08
US20040185326A1 (en) 2004-09-23

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