WO2017072000A1 - Alimentation de cathode pour une pile à combustibles multiples ainsi que procédé d'alimentation de sous-piles à combustible avec un combustible de cathode - Google Patents

Alimentation de cathode pour une pile à combustibles multiples ainsi que procédé d'alimentation de sous-piles à combustible avec un combustible de cathode Download PDF

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Publication number
WO2017072000A1
WO2017072000A1 PCT/EP2016/075066 EP2016075066W WO2017072000A1 WO 2017072000 A1 WO2017072000 A1 WO 2017072000A1 EP 2016075066 W EP2016075066 W EP 2016075066W WO 2017072000 A1 WO2017072000 A1 WO 2017072000A1
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WO
WIPO (PCT)
Prior art keywords
cathode
fuel cell
operating medium
supply
partial
Prior art date
Application number
PCT/EP2016/075066
Other languages
German (de)
English (en)
Inventor
Christian Lucas
Daniel Grundei
Jan-Philipp Brinkmeier
Hannes Scholz
Christian Schlitzberger
Original Assignee
Volkswagen Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen Ag filed Critical Volkswagen Ag
Publication of WO2017072000A1 publication Critical patent/WO2017072000A1/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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04126—Humidifying
    • H01M8/04141—Humidifying by water containing exhaust gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/249—Grouping of fuel cells, e.g. stacking of fuel cells comprising two or more groupings of fuel cells, e.g. modular assemblies
    • 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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04111—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants using a compressor turbine assembly
    • 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 cathode supply for a multiple fuel cell of a
  • Fuel cell system Furthermore, the invention relates to a method for supplying the cathodes of partial fuel cells of a multiple fuel cell of a
  • Fuel cell system with a cathode operating medium Furthermore, the invention relates to a fuel cell system or a vehicle with such.
  • a fuel cell uses an electrochemical conversion of a fuel with oxygen to water to generate electrical energy.
  • the fuel cell contains as a core component at least one so-called membrane-electrode unit (English MEA for Membrane Electrode Assembly), which is a structure of an ion-conducting, often
  • GDL gas diffusion layers
  • Bipolar plates also called flux field plates or separator plates
  • the individual membrane electrode units which supply and usually also supply the membrane electrode units, ie a supply of the individual cells of the fuel cell with the operating media, the so-called reactants to serve a cooling.
  • the bipolar plates provide for a respective electrical connection to the respective adjacent membrane electrode units.
  • anode operating medium in particular hydrogen (H 2 ) or a hydrogen-containing
  • Fuel cell in the anode spaces of the single cells to the cathode electrodes
  • cathode electrodes via a cathode side open flow field of the bipolar plates, a so-called cathode operating medium, in particular oxygen (0 2 ) or a
  • oxygen-containing gas mixture for example air
  • V2O 2 + 2e " -> O 2 " oxygen-containing gas mixture
  • O 2- oxygen anions formed on the cathode electrodes
  • the cathode operating medium entering the cathode of the fuel cell must have a certain relative humidity in order to prevent the membranes from drying out.
  • a humidifier is used in the fuel cell system, which transmits a part of a moisture from the cathode exhaust gas in the cathode operating medium, which is supplied to the fuel cell.
  • Such a humidifier needs a comparatively large space, which is a problem for a unit of a fuel cell assembly (fuel cell plus their devices and facilities (anode supply, cathode supply et cetera)) and the vehicle having the fuel cell assembly.
  • Fuel cell unit especially a double fuel cell unit to take advantage of.
  • a comparatively large humidifier of the dual fuel cell assembly is to be reduced, so that space can be saved. This should be feasible and feasible with simple and inexpensive means.
  • the object of the invention is by means of a cathode supply for a multiple fuel cell of a fuel cell system; by a method for supplying the Cathodes of partial fuel cells of a multiple fuel cell of a
  • Fuel cell system with a cathode operating medium by means of a
  • the cathode supply according to the invention comprises at least two in one
  • Partial fuel cells wherein an upstream Partbrennstoffzelle upstream with a humidated cathode operating medium is supplied and a downstream
  • Partial fuel cell upstream with a non-moistened cathode operating medium is supplied to the non-moistened cathode operating medium, a cathode exhaust gas at least one or the upstream part of the fuel cell fuel is immiscible.
  • the upstream can be supplied with the cathode operating medium
  • Partial fuel cell a first upstream partial fuel cell.
  • a plurality of such upstream partial fuel cells are applied.
  • the entire cathode off-gas from the upstream sub-fuel cell, or even a portion thereof, is admixable with the cathode operating medium for the downstream sub-fuel cell.
  • the at least two partial fuel cells can be provided separately (external cascading), for example in at least two housings, or also together (internal cascading) in a single housing.
  • a first mass flow of an entire multi-fuel cell cathode operating medium is humidified by means of the humidifier and supplies the first, that is, upstream, partial fuel cell.
  • a second, unaerated mass flow of the entire cathode operating medium is admixed with a flowing fluid, which is increasingly being transferred from the humidified cathode operating medium to the cathode waste gas, between the partial fuel cells.
  • a necessary moistening of the second, unaerated mass flow takes place via the present cathode waste gas, in which newly formed water vapor or newly formed liquid water is located.
  • the cathode supply to a humidifier being provided by the humidifier on the one hand to be humidified cathode operating medium for the upstream part fuel cell hin matströmbar and by the humidifier on the other hand to be dehumidified cathode exhaust at least one or the downstream
  • Part fuel cell is provided hin matströmbar.
  • a first portion of the total (unswept) cathode operating medium for the multiple fuel cell flows as a humidified fluid for wetting by the humidifier and then passes upstream and passes upstream as a humidified cathode operating medium into the upstream particulate fuel cell.
  • this sub-fuel cell is at a cathode of this partial fuel cell part of the
  • Partial fuel cell is converted to water and passes as oxygen depleted and enriched with water vapor or water cathode exhaust gas (fluid) downstream a fluid outlet of this sub-fuel cell. In time, this fluid is at least partially, but preferably completely, supplied to the downstream partial fuel cell.
  • This cathode operating medium has not passed the humidifier.
  • This fluid that is, a mixture of the cathode exhaust gas (from the upstream partial fuel cell) and the other
  • cathode operating medium for the downstream partial fuel cell
  • this fluid being depleted in oxygen and steam or water enriched cathode exhaust gas leaves a downstream fluid outlet of this sub-fuel cell.
  • the cathode exhaust gas of the second that is in the fluid flow direction of the wet cathode operating medium rear partial fuel cell leaves the multiple fuel cell and subsequently enters the humidifier for wetting the unused cathode operating medium for the first partial fuel cell.
  • the first partial fuel cell may be both the first and / or an upstream partial fuel cell.
  • the cathode exhaust optionally together with an anode exhaust gas, can be supplied to an exhaust device of the vehicle.
  • the unhumidified cathode operating medium is downstream of the upstream sub-fuel cell, on a connection line between the two
  • Unmoved cathode operating medium to an additional cathode supply path by means of which the unhumidated cathode operating medium is the fluid from the upstream fuel cell zuzuschbar the cathode exhaust gas from the upstream part.
  • an adjusting means can be provided on / in the additional cathode supply path. This means that at least one more or the other part of the total
  • Unwetted cathode operating medium is admixed by at least one or the additional cathode supply path to the cathode exhaust gas from the upstream part of the fuel cell for the downstream part of the fuel cell.
  • the first portion and the further portion of the total (humidified and unhumidified) cathode operating medium add up to 100%.
  • the first portion and the further portion of the total (humidified and unhumidified) cathode operating medium add up to 100%.
  • there are, for example, two further parts of the entire (humidified and unhumidified) cathode operating medium which then add up to 100% with the first portion of the entire (humidified and unhumidified) cathode operating medium.
  • a fluid-mechanical parameter mass flow, volume flow, fluid pressure, etc.
  • the additional cathode supply path opens downstream of the upstream sub-fuel cell on / in the connection line between the sub-fuel cells or upstream on the downstream
  • a humidity of the un-moistened cathode operating medium mixed with the cathode exhaust from the upstream sub-fuel cell is upstream at the downstream
  • Configuration of the cathode supply are adjusted to each other. It can be iterated, that is, first select a scaling of the partial fuel cells and then determining the humidity of the mixed fluid (cathode exhaust from the upstream part of the fuel cell plus unsmoked cathode operating medium for the downstream part of the fuel cell) and a size of the humidifier. Subsequently it is determined what this has to do with scaling, which allows the scaling to be adjusted. Of course, this can also be done the other way round.
  • a scaling of the partial fuel cells relative to one another is understood to mean, for example, a respective size of the partial fuel cells and thus a total size of the multiple fuel cell, ie how a size of the respective partial fuel cell relates to the total size of the multiple fuel cell or how the sizes of the respective fuel cells behave
  • Partial fuel cells behave to each other. This means, for example: a respective number of individual cells, a size of one or the individual cells, an area of the individual cells et cetera in the respective partial fuel cell.
  • the size of the humidifier naturally includes parameters such as a humidifier, a type of humidifier and so on.
  • the cathode supply has a cathode compressor, by means of which both the upstream partial fuel cell with the humidified cathode operating medium and the downstream partial fuel cell with the unhumidified cathode operating medium can be supplied.
  • the additional branches Cathode supply path for downstream partial fuel cell downstream of the cathode compressor and upstream of the humidifier on / in the cathode supply path for the upstream partial fuel cell from. It is of course possible to reverse this, that is, the cathode supply path for the upstream sub-fuel cell branches from the additional cathode supply path for the downstream sub-fuel cell
  • the cathode compressor is partially or exclusively driven by an electric motor; that is, it is optionally a cathode turbine (for example, by an exhaust gas turbocharger) additionally applicable for driving the cathode compressor.
  • a cathode turbine for example, by an exhaust gas turbocharger
  • the cathode compressor In the case of two partial fuel cells, a single cathode compressor accordingly results. In the case of more than two partial fuel cells, it is also possible to use two or more cathode compressors and / or two or more electric motors.
  • the cathode supply for transporting the humidifying cathode operating medium at / in the cathode supply path to a cathode compressor wherein the cathode supply for transport of the unhumidified cathode operating medium on / in the additional cathode supply path an additional
  • Cathode compressor drivable together by means of an electric motor.
  • the cathode compressor Preferably sit the cathode compressor, the additional cathode compressor and the electric motor on a common shaft.
  • a transmission is optionally applicable, which can sit between the electric motor and one of the two cathode compressor. It is also possible to additionally or alternatively provide one or the transmission between the cathode compressors.
  • the cathode compressor can be driven partially or exclusively by means of the electric motor; that is, it is optionally a cathode turbine (for example, by an exhaust gas turbocharger) and optionally additionally applicable with an electric motor for driving the cathode compressor.
  • the cathode compressor is by means of a cathode turbine
  • the additional cathode compressor driven by an electric motor.
  • the additional cathode compressor is again partial or can only be driven by means of the electric motor; that is, it is optionally a cathode turbine (for example, by an exhaust gas turbocharger) additionally applicable for driving the cathode compressor.
  • the cathode compressor by means of an electric motor and the additional cathode compressor by means of a cathode turbine (exhaust gas turbocharger) and optionally additionally driven by an electric motor.
  • the cathode compressor is in turn partially or exclusively driven by means of the electric motor; that is, it is
  • a cathode turbine for example, by an exhaust gas turbocharger additionally applicable for driving the additional cathode compressor.
  • a first upstream sub-fuel cell is supplied with a moistened cathode operating medium, with respect to the fluid flow direction of the wet Cathode operating medium, a downstream partial fuel cell is supplied with a non-moistened cathode operating medium and a cathode exhaust gas at least one or the upstream partial fuel cell.
  • the multiple fuel cell or the partial fuel cells a cathode supply, which as an inventive
  • Figure 1 is a simplified block diagram of a preferred embodiment of a
  • Fuel cell system according to the invention with a double fuel cell
  • Figure 2 is a simplified block diagram of a first embodiment of a
  • FIG. 3 is a simplified block diagram of a second embodiment of the invention.
  • FIG. 4 is a simplified block diagram of a third embodiment of the invention.
  • FIG. 5 is a simplified block diagram of a fourth embodiment of the invention.
  • the invention is based on four embodiments of a cathode supply 30 for a dual fuel cell 10; 101, 102 of a vehicle and by a method (implicitly) for supplying the cathodes of partial fuel cells 101, 102 of a dual fuel cell 10; 101, 102 explained in more detail.
  • the invention is not limited to the embodiments explained below, but is of a more fundamental nature, so that it can be applied to all cathode supplies of multiple fuel cells, for example with three or more partial fuel cells, or even to stationary fuel cell systems.
  • FIG. 1 shows a fuel cell system 1 according to a preferred embodiment of the invention.
  • the fuel cell system 1 is preferably part of a vehicle not shown in detail, in particular a motor vehicle or an electric vehicle, which preferably has an electric traction motor, which or which by the
  • Fuel cell system 1 can be supplied with electrical energy.
  • the fuel cell system 1 includes, as a core component, a dual fuel cell 10; 101, 102 with two partial fuel cells 101, 102 and two, respectively
  • Stacked form arranged single fuel cells 1 1 - hereinafter referred to as single cells 1 1 - have and preferably in a fluid-tight stack housing 16 (only Figure 1) or in two separate fluid-tight stacking housings 16, 16 (see Figures 2 to 5) are housed.
  • Each single cell 1 1 comprises an anode compartment 12 and a
  • a partial fuel cell stack 101, 102 is also referred to simply as partial fuel cell 101, 102.
  • the anode chambers 12 and the cathode chambers 13 of the dual fuel cell 10; 101, 102 each have a restrictive catalytic electrode (part of the membrane-electrode assembly 14, see below), that is, an anode electrode and a cathode electrode, each catalyzing a partial reaction of a fuel cell reaction.
  • the anode electrode and the cathode electrode each comprise a catalytic material, such as platinum, which is supported on an electrically conductive substrate having a large specific area
  • a structure of a membrane and the two associated electrodes is also called
  • Membrane electrode unit 14 denotes. Between two such membrane-electrode units 14 (in FIG. 1, only a single membrane-electrode unit 14 is indicated), a bipolar plate 15 is also indicated in FIG. 1, which indicates a supply of operating media 3, 5 into a relevant anode compartment 12 a first single cell 1 1 and a respective cathode space 13 of a directly adjacent thereto second single cell 1 1 and beyond an electrical connection between the two directly adjacent single cells 1 1 realized. Between a bipolar plate 15 and a directly adjacent anode electrode of a membrane electrode assembly 14 there is an anode space 12 and between a cathode electrode of the same membrane electrode assembly 14 and a directly adjacent second
  • Bipolar plate 15 is a cathode compartment 13 is formed (single cell 1 1).
  • Gas diffusion layers between the membrane electrode assemblies 14 and the bipolar plates 15 may be arranged.
  • 101, 102 are thus membrane electrode units 14 and bipolar plates 15 alternately arranged or stacked (partial fuel cell stack 101, 102).
  • Partial fuel cell stack 101, 102 with the operating media 3, 5 has the
  • Fuel cell system 1 on the one hand, an anode supply 20 and on the other hand a
  • the anode supply 20 includes an anode supply path 21, which is a
  • Feeding an anode operating medium 3, a fuel 3, for example, hydrogen 3 or a hydrogen-containing gas mixture 3, in the anode chambers 12 of the dual fuel cell 10; 101, 102 serves.
  • the anode supply path 21 connects a fuel storage tank 23 or fuel tank 23 with an anode inlet of the dual fuel cell 10; 101, 102.
  • the anode supply 20 further comprises an anode exhaust path 22, which an anode exhaust gas 4 from the anode chambers 12 by a
  • Anode output of the dual fuel cell 10; 101, 102 passes through.
  • a built-up anode operating pressure on an anode side of the dual fuel cell 10; 101, 102 is preferably adjustable by means of an adjusting means 24 in the anode supply path 21.
  • the anode supply 20 preferably has a fuel recirculation line 25, which contains the anode exhaust gas path 22 with the anode supply path 21
  • a compressor may be provided on / in the fuel recirculation line 25 (not shown).
  • the cathode supply 30 includes a cathode supply path 31 which connects the
  • the cathode supply 30 further comprises a cathode exhaust path 32, which is a cathode exhaust gas 6, in particular an exhaust air 6, from the cathode chambers 13 of the dual fuel cell 10; 101, 102 dissipates and this optionally provided exhaust device (not shown) supplies.
  • a cathode compressor 33 is preferably arranged on / in the cathode supply path 31.
  • the cathode compressor 33 is designed as a cathode compressor 33 driven exclusively or also by an electric motor, the drive of which (also) takes place by means of an electric motor 34 or a drive 34, which is preferably equipped with a corresponding power electronics 35.
  • the cathode compressor 33 is designed as an at least electrically driven turbocharger 33 (English ETC for Electric Turbo Charger).
  • the cathode compressor 33 may further include a cathode turbine 36 disposed in the cathode exhaust path 32
  • the cathode turbine 36 constitutes an expander which causes an expansion of the cathode exhaust gas 6 and thus a lowering of its fluid pressure (increasing an efficiency of the dual fuel cell 10, 101, 102).
  • the cathode supply 30 may also according to the illustrated embodiment
  • Wastegate 37 and a wastegate line 37 have, which
  • the wastegate 37 allows an operating pressure of the cathode operating medium 5 to be temporarily in the double fuel cell 10; 101, 102 without shutting down the cathode compressor 33.
  • An adjusting means 38 arranged in the wastegate 37 permits adjustment of a volume flow of the double fuel cell 10; 101, 102 optionally circulating cathode operating medium. 5
  • All adjusting means 24, 26, 38, 132 (see also below) of the fuel cell system 1 can be designed as controllable, controllable or non-controllable valves, flaps, throttles, diaphragms et cetera.
  • at least one other corresponding adjusting means (not shown) on / in an anode path 21, 22 and / or a cathode path 31, 32 or on / in a line of the anode path 21, 22 and / or a line of the cathode path 31, 32 may be arranged.
  • the preferred fuel cell system 1 also has a humidifier 110.
  • humidifier 10 is arranged in the cathode supply path 31 such that it can be flowed through by the cathode operating medium 5.
  • the humidifier is arranged in the cathode exhaust path 32 so that it can be flowed through by the cathode exhaust gas 6.
  • the humidifier 110 is preferably located in the cathode supply path 31 between the cathode compressor 33 and a cathode input of the dual fuel cell 10; 101, 102 and, on the other hand, in the cathode exhaust path 32 between a cathode exit of the dual fuel cell 10; 101, 102 and the optionally provided cathode turbine 36 is arranged.
  • a moisture carrier (not shown) of the humidifier 110 preferably has a plurality of membranes, which are often formed either flat or in the form of hollow fibers.
  • Bypass line to be bypassed may also be provided a cathode turbine bypass line from the cathode exhaust path 32 which bypasses the cathode turbine 36.
  • the anode supply 20 may alternatively or additionally have a humidifier that is analogous to the cathode supply 30.
  • the anode exhaust path 22 may open into the cathode exhaust path 32, wherein the anode exhaust gas 4 and the cathode exhaust gas 6 may optionally be discharged via the common exhaust device.
  • Embodiments the cathode operating medium 5 to flow through a provided on / in the cathode supply path 31 intercooler.
  • the invention discloses humidification of the dual fuel cell 10; 101, 102 and the dual fuel cell stack 10; 101, 102 one
  • Fuel cell assembly 1 of the fuel cell system 1 It is of course possible for the invention to be applied to a different number of individual fuel cells 101, 102, ...
  • FIG. 2 greatly simplifies the first embodiment of the cathode supply 30 for the dual fuel cell 10; 101, 102.
  • the compressible by means of the cathode compressor 33 cathode operating medium 5 can be divided into two partial streams or mass flows before the humidifier 1 10.
  • a first mass flow is humidified by means of the humidifier 1 10 and supplied in an operation of the dual fuel cell 10; 101, 102 through the cathode supply path 31 through the first partial fuel cell 101 (see arrows in Figures 1 to 5).
  • only the first mass flow is humidified, which allows a reduction of the humidifier 1 10.
  • the cathode exhaust gas 6 of the first partial fuel cell 101 is then miscible with the second, un-moistened (dry) mass flow of the cathode compressor 33, which flows through an additional cathode supply path 130 during operation.
  • This mixed and wet by the cathode exhaust gas 6 mass flow then supplies the second partial fuel cell 102.
  • the additional cathode supply path 130 branches off the cathode supply path 31 downstream of the cathode compressor 33.
  • an adjusting means 132 for example a flap 132, is additionally provided in the additional cathode supply path 130 for the second mass flow, by means of which pressure losses in the first
  • Partial fuel cell 101 can be compensated.
  • the cathode compressor 33 can be driven analogously to FIG. 1 by means of the electric motor 34 or by means of the drive 34.
  • the electric motor 34 can also be driven in a supportive manner analogous to FIG. 1 by means of the cathode turbine 36.
  • the admixing of the unhumidified mass flow (second mass flow) to the cathode waste gas 6 of the first partial fuel cell 101 can take place downstream of the first partial fuel cell 101, on a connecting line 120 between the partial fuel cells 101, 102 or upstream of the second partial fuel cell 102.
  • a scaling of the two Partial fuel cells 101, 102 to each other a humidity at an inlet of the second partial fuel cell 102 and / or a size of the humidifier 1 10 adjustable.
  • Partial fuel cell 102 to ensure.
  • a branch line falls away from the cathode supply path 31.
  • the additional cathode compressor 133 preferably sucks the cathode operating medium 5 through the additional cathode supply path 130 to an air filter box (not shown) which is in fluid communication with the environment 2. This also preferably relates to the cathode compressor 33 of the cathode supply path 31.
  • a power of the additional cathode compressor 133 may be higher than that of the first partial fuel cell 101
  • Cathode compressor 33 can be reduced.
  • An adjusting means 132 in the additional cathode supply path 130 may be applicable.
  • the two cathode compressors 33, 133 can be arranged, for example, via a common shaft, for example with a back-to-back arrangement, which reduces bearing forces.
  • the electric motor 34 can in turn be supported in a supportive manner analogous to FIG. 1 by means of the cathode turbine 36. Furthermore, a transmission between the electric motor 34 and at least one of
  • the cathode compressor 33 is drivable on / in the cathode supply path 31 via the cathode turbine 36 on / in the cathode exhaust path 32, through which preferably the entire cathode exhaust gas 6 of both partial fuel cells 101, 102 flows.
  • a cathode compressor-cathode turbine combination 33, 36 as in an exhaust gas turbocharger, be formed without an additional electric motor;
  • an electric motor (34) is applicable.
  • the additional cathode compressor 133 on / in the additional Cathode supply path 130 is drivable analogously to Figure 3 by means of the electric motor 34, wherein optionally the additional cathode compressor 133 can be driven in turn supportive analogous to Figure 1 by means of a cathode turbine (36).
  • the multiple fuel cell 10; 101, 102 be designed such that always a sufficient supply of the partial fuel cells 101, 102 is ensured.
  • Partial fuel cells 101, 102 preferably do not have the same size.
  • FIG. 5 greatly simplifies the preferred fourth embodiment of the invention
  • Cathode supply path 31 is from electric motor 34 and the additional cathode compressor 133 on / in the additional cathode supply path 130 is drivable by the cathode turbine 36 at / in the cathode exhaust path 32.
  • Fuel cell system fuel cell assembly, preferably for a vehicle with an electric motor, in particular an electric traction motor
  • Fluid, exhaust gas optionally including liquid water, in particular anode exhaust gas fluid, operating medium, reactant, in particular cathode operating medium, preferably air
  • Fluid, exhaust gas including, if appropriate, liquid water, in particular cathode exhaust gas, preferably exhaust air (double / multiple) fuel cell, (double / multiple) fuel cell stack of the fuel cell system 1 with at least two partial fuel cells,
  • Membrane electrode unit preferably with a polymer electrolyte membrane and an anode electrode and a cathode electrode
  • Adjusting means (on) controllable, (controllable), not controllable, in particular valve, flap, throttle, aperture et cetera
  • Fuel recirculation line Adjusting means (on) controllable, (controllable), not controllable, in particular valve, flap, throttle, aperture et cetera fuel cell supply, cathode supply, cathode circuit of the
  • Turbine with optionally variable turbine geometry, cathode turbine, expander, possibly an exhaust gas turbocharger
  • Adjustment means (on) controllable, (controllable), not controllable, in particular valve, flap, throttle, orifice et cetera upstream partial fuel cell, partial fuel cell stack
  • controllable (controllable), not controllable, in particular valve, flap, throttle, aperture et cetera

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Abstract

L'invention concerne une alimentation de cathode (30) pour une pile à combustibles multiples (10; 101, 102) d'un système à piles à combustible (1) avec au moins deux sous-piles à combustible (101, 102) montées en série dans une direction d'écoulement d'un combustible de cathode (5), une sous-pile à combustible en amont (101) pouvant être alimentée par un combustible de cathode (5) humidifié tandis qu'une sous-pile à combustible en aval (102) peut être alimentée avec un combustible de cathode (5) non humidifié et un gaz d'évacuation de cathode (6) au moins d'une ou de la sous-pile à combustible en amont (101) peut être mélangé au combustible de cathode (5) non humidifié. L'invention concerne en outre un procédé d'alimentation des cathodes de sous-piles à combustibles (101, 102) d'une pile à combustibles multiples (10 ; 101, 102) d'un système de piles à combustible (1) avec un combustible de cathode (5). Dans une direction d'écoulement du combustible de cathode (5) à travers la pile à combustibles multiples (10 ; 101, 102), une sous-pile à combustible en amont (101) est alimentée avec un combustible de cathode humidifié (5) et (en référence à la direction d'écoulement du combustible de cathode (5)) une sous-pile à combustible en aval (102) est alimentée avec un combustible de cathode non humidifié (5) et avec un gaz d'évacuation de cathode (6) au moins d'une ou de la sous-pile à combustible en amont (101).
PCT/EP2016/075066 2015-10-27 2016-10-19 Alimentation de cathode pour une pile à combustibles multiples ainsi que procédé d'alimentation de sous-piles à combustible avec un combustible de cathode WO2017072000A1 (fr)

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Application Number Priority Date Filing Date Title
DE102015220950.4 2015-10-27
DE102015220950.4A DE102015220950A1 (de) 2015-10-27 2015-10-27 Kathodenversorgung für eine Mehrfach-Brennstoffzelle sowie Verfahren zum Versorgen von Teilbrennstoffzellen mit einem Kathoden-Betriebsmedium

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WO2017072000A1 true WO2017072000A1 (fr) 2017-05-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT523681A1 (de) * 2020-04-02 2021-10-15 Avl List Gmbh Sammelvorrichtung für ein Sammeln von Produktwasser in einem Anodenpfad

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EP1294037A2 (fr) * 2001-09-14 2003-03-19 Honda Giken Kogyo Kabushiki Kaisha Empilement de piles à combustible et méthode d'alimentation de gaz de réaction pour l'empilement de piles à combustible
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