DE19921007C1 - PEM fuel cell with membrane electrode assembly has gas channels integrated in bipolar plates cladded with fluid transporting layer for damping membranes via condensed water - Google Patents
PEM fuel cell with membrane electrode assembly has gas channels integrated in bipolar plates cladded with fluid transporting layer for damping membranes via condensed waterInfo
- Publication number
- DE19921007C1 DE19921007C1 DE19921007A DE19921007A DE19921007C1 DE 19921007 C1 DE19921007 C1 DE 19921007C1 DE 19921007 A DE19921007 A DE 19921007A DE 19921007 A DE19921007 A DE 19921007A DE 19921007 C1 DE19921007 C1 DE 19921007C1
- Authority
- DE
- Germany
- Prior art keywords
- fuel cell
- transporting layer
- liquid
- layer
- dew point
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
-
- 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
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
-
- 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
- H01M8/04291—Arrangements for managing water in solid electrolyte fuel cell systems
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
Description
Die Erfindung betrifft die Befeuchtung der Membran einer PEM Brennstoffzelle mit Membran-Elektroden-Einheiten (MEA) und in den Bipolarplatten integrierten Gaska nälen.The invention relates to the moistening of the membrane of a PEM fuel cell Membrane electrode units (MEA) and Gaska integrated in the bipolar plates neal.
In US 5529855 wird ein Verfahren zur Befeuchtung der Membran-Elektroden-Einheit (MEA) beschrieben, mittels in oder auf der MEA angebrachter Kanäle oder Leitun gen. Das zur Beschickung der Kanäle oder Leitungen verwendete Wasser kann aus einem Reservoir bezogen und mit einer Pumpe gefördert werden.US 5529855 describes a method for moistening the membrane electrode assembly (MEA), by means of channels or lines installed in or on the MEA The water used to feed the canals or pipes can run out can be obtained from a reservoir and pumped.
Aufgabe der Erfindung ist die wartungsfreie und zuverlässige Befeuchtung der Membran einer Brennstoffzelle. Diese Aufgabe wird durch den Gegenstand des Patentanspruchs gelöst; die Unteransprüche betreffen vorteilhafte Ausgestaltungen der Erfindung.The object of the invention is the maintenance-free and reliable humidification of the Membrane of a fuel cell. This task is the subject of Claim resolved; the subclaims relate to advantageous refinements the invention.
Die Erfindung wird nachfolgend anhand von Figuren näher erläutert.The invention is explained in more detail below with reference to figures.
Es zeigen:Show it:
Fig. 1-4 die Befeuchtung eine Zone einer MEA (Membran-Electrode- Assembly) in prinzipieller Darstellung, Fig. 1-4 moistening a zone of a MEA (membrane-Electrode- Assembly) in a basic representation,
Fig. 5 die Entwässerung einer MEA, Fig. 5, the dewatering of a MEA,
Fig. 6A-6C Leitungsmechanismen für den Flüssigkeitstransport, Fig. 6A-6C conduction mechanisms for liquid transport,
Fig. 7A-7B Einzelheiten von Fig. 6. 7A-7B. Details of Fig. 6.
Die Figuren zeigen eine Zone einer PEM-Brennstoffzelle mit einer MEA 2, Bipolar platten (BIP) 4, Kanälen 6, Kapillarschicht 8, Gaseintritt 10, Produktwasser-Ausfall 12 Gasaustritt 26.The figures show a zone of a PEM fuel cell with an MEA 2 , bipolar plates (BIP) 4 , channels 6 , capillary layer 8 , gas inlet 10 , product water failure 12, gas outlet 26 .
Zur Befeuchtung der MEA wird ein Teil des im Brennstoffzellenbetrieb anfallenden Produktwassers durch Kapillarkräfte zum Gaseingang zurückgeleitet (Fig. 3). Der (relativ) trockene Gasstrom kann sich dadurch mit Wasser anreichern; damit wird das Austrocknen der MEA durch den trockenen Eintrittsgasstrom vermieden. Zum Flüssigkeitstransport können dabei sowohl der Kanalboden 14 als auch die Kanal wände 16 mit einer Kapillarschicht 8 versehen werden (Fig. 2). Die Kapillarschicht 8 kann als offene oder teilweise geschlossene Struktur ausgeführt werden. Im ge schlossenen Fall ist die Kapillarschicht im Bereich der Wasseraufnahme und Was serabgabe geöffnet, um den Wasseraustausch an den gewünschten Stellen zu ermöglichen. Die Flüssigkeitsabgabe der Kapillarschicht am Gaseintritt kann dabei sowohl an den Gasstrom als auch direkt an die MEA erfolgen. Zur Mitbefeuchtung der MEA kann z. B. die Fließrichtung der Flüssigkeit an den Kanalwänden so einge stellt werden, daß die Kapillarenden direkten Kontakt mit der MEA-Zone erhalten (Fig. 4). Alternativ dazu kann durch Verwendung einer amorphen, schwammartigen Kapillarstruktur eine homogene Befeuchtung des gesamten Sektors erzielt werden (Fig. 1).To humidify the MEA, part of the product water generated in fuel cell operation is returned to the gas inlet by capillary forces ( FIG. 3). The (relatively) dry gas flow can thereby be enriched with water; this prevents the MEA from drying out due to the dry inlet gas flow. For liquid transport, both the channel bottom 14 and the channel walls 16 can be provided with a capillary layer 8 ( Fig. 2). The capillary layer 8 can be designed as an open or partially closed structure. In the closed case, the capillary layer in the area of water absorption and water discharge is open to enable water exchange at the desired locations. The liquid release of the capillary layer at the gas inlet can take place both to the gas flow and directly to the MEA. To moisten the MEA z. B. the flow direction of the liquid on the channel walls is set so that the capillary ends get direct contact with the MEA zone ( Fig. 4). Alternatively, homogeneous humidification of the entire sector can be achieved by using an amorphous, sponge-like capillary structure ( FIG. 1).
Analog zur Befeuchtung kann die Kapillarwirkung des weiteren zur Abführung des in der Zelle entstandenen Produktwassers verwendet werden; dabei wird das von der Kapillarschicht 8 aufgenommene, überschüssige Produktwasser aus der Zelle transportiert und die Zelle somit entwässert (Fig. 5). Zum Flüssigkeitstransport können dabei sowohl der Kanalboden als auch die Kanalwände mit einer Kapillar schicht versehen werden.Analogous to moistening, the capillary action can also be used to drain the product water that has formed in the cell; the excess product water taken up by the capillary layer 8 is transported out of the cell and the cell is thus dewatered ( FIG. 5). For the liquid transport, both the channel floor and the channel walls can be provided with a capillary layer.
In Ihrer Ausführung kann die Kapillarschicht eine amorphe (schwammartige) oder auch eine gerichtete Struktur aufweisen. Darüber hinaus kann die gewünschte Kapillarwirkung auch durch Modifikation der Kanaloberfläche durch mechanische, chemische oder andersgeartete Bearbeitung erzeugt werden.In its design, the capillary layer can be an amorphous (sponge-like) or also have a directional structure. It can also be the one you want Capillary action also through modification of the channel surface by mechanical, chemical or other types of processing are generated.
Fig. 2
Es wird eine bereits konturierte bipolare Platte mit einem oxidierbaren Material - z. B.
Nickel - beschichtet, oxidiert und zur Porenausbildung wieder reduziert. Der Vorteil
dieser Variante liegt im reduzierten Materialverbrauch der (teureren) Nickelbe
schichtung, da kein Beschichtungsmaterial weggeätzt werden muß und die Be
schichtung damit dünner ausfallen kann. Fig. 2
An already contoured bipolar plate with an oxidizable material - e.g. B. Nickel coated, oxidized and reduced again to form pores. The advantage of this variant lies in the reduced material consumption of the (more expensive) nickel coating, since no coating material has to be etched away and the coating can therefore be thinner.
Fig. 4
Zur Mitbefeuchtung der MEA kann die Fließrichtung der Flüssigkeit an den Kanal
wänden so eingestellt werden, daß die Kapillarenden direkten Kontakt mit der MEA-
Zone erhalten und die MEA durch direkten Wasseraustausch mit der Kapillarschicht
gezielt direkt befeuchtet wird Fig. 4
To co-moisten the MEA, the direction of flow of the liquid on the channel walls can be set so that the capillary ends are in direct contact with the MEA zone and the MEA is specifically moistened by direct water exchange with the capillary layer
Fig. 6A
Zur Erzeugung von Kapillarkräften können z. B. fluidleitende Folien 20
in die Kanalstruktur durch Einlegen oder einkleben
eingebracht werden. Diese Folien sind beispielsweise in der Zeitschrift "bild der
wissenschaft" 2, 1998 auf den Seiten 16 bis 21 beschrieben und weisen eine
mikroreplizierte Oberfläche auf. Mitteis der Folien ist eine gerichtete Flüssigkeitslei
tung im. Kanal möglich. Zur gleichzeitigen Entwässerung und Befeuchtung kann es
sinnvoll sein, einen Teil des Produktwassers zum Eingang zurückzuleiten (um die
Befeuchtung zu verbessern) und den Rest in Richtung Ausgang abzuführen (Fig. 5). Figure 6A
To generate capillary forces z. B. fluid-conducting films 20 can be introduced into the channel structure by inserting or gluing. These foils are described, for example, in the journal "picture of science" 2, 1998 on pages 16 to 21 and have a microreplicated surface. The middle of the foils is a directional liquid line in the. Channel possible. For simultaneous dewatering and humidification, it can make sense to return part of the product water to the entrance (to improve humidification) and to discharge the rest towards the exit ( Fig. 5).
Fig. 6B
Alternativ zur fluidleitenden Folie können schwammartige Kapillarstrukturen 22
Verwendung finden. Ein Vorteil dieser amorphen Kapillarstruktur legt in der einfa
cheren Einbringung in stark gekrümmte Kanäle. Ein Nachteil liegt im reduzierten und
nicht genau gerichteten, langsameren Flüssigkeitstransport sowie in der Tatsache,
daß ein Flüssigkeitsverlust durch unkontrolliertes Abdampfen möglich ist.
Figure 6B
As an alternative to the fluid-conducting film, sponge-like capillary structures 22 can be used. One advantage of this amorphous capillary structure lies in the simpler introduction into strongly curved channels. A disadvantage is the reduced and not precisely directed, slower liquid transport and the fact that a loss of liquid is possible due to uncontrolled evaporation.
Alternativ zur fluidleitenden Folie können auch röhrenförmige Kapillarstrukturen 24, wie sie z. B. in Wärmerohren (Heatpipes) eingesetzt werden, Verwendung finden. Da röhrenförmige Kapillarstrukturen auch in stark gekrümmte Kanäle - zum Beispiel durch Einlegen oder Einkleben - eingebracht werden können, tritt nur ein geringer Flüssigkeitsverlust durch unkontrolliertes Ausdampfen während des Transportes zwischen den Enden auf. Zur Erzielung einer genügend großen Wasseraufnahme am "feuchten" Ende muß ein breiter Einzugsbereich durch unterschiedliche Kapillar längen vorgesehen werden.As an alternative to the fluid-conducting film, tubular capillary structures 24 , such as, for. B. are used in heat pipes (heat pipes). Since tubular capillary structures can also be introduced into highly curved channels - for example, by inserting or gluing - there is only a small loss of liquid due to uncontrolled evaporation during transport between the ends. In order to achieve a sufficiently large water absorption at the "moist" end, a wide intake area through different capillary lengths must be provided.
Fig. 7A
Als ganzheitlicher Lösungsansatz kann der Transport des Produktwassers zur
Befeuchtung/Entwässerung der Zelle auch in kapillaren Strukturen innerhalb der
Kanalstege 8 erfolgen. Figure 7A
As a holistic solution, the transport of the product water for moistening / dewatering the cell can also take place in capillary structures within the channel webs 8 .
Zur Erzeugung einer möglichst umfangreichen, kapillar wirksamen Schicht im Steg kann z. B. ein oxidierbares Material, z. B. Nickel, auf die glatte Bipolarplatte - z. B. galvanisch - aufgebracht und durch Anwendung chemischer Ätzverfahren mit einer Kanalstruktur versehen werden. Durch Oxidation der verbleibenden Nickelstege bei hohen Temperaturen (< 600°C) und anschließende Reduktion wandelt sich der Steg in eine stark poröse, schwammartige Struktur um, welche die geforderte Kapillarwir kung entwickeln kann.To create the largest possible capillary layer in the web can e.g. B. an oxidizable material, e.g. B. nickel, on the smooth bipolar plate - z. B. electroplated and applied using chemical etching techniques with a Channel structure. By oxidizing the remaining nickel bars high temperatures (<600 ° C) and subsequent reduction, the web changes into a highly porous, sponge-like structure, which creates the required capillary kung can develop.
Fig. 7B
Es kann auch eine Bipolarplatte aus einem vollständig porösen Material verwendet
werden, die zur Vermeidung eines etwaigen Wasser- und Gasdurchtritts senkrecht
zur Plattenebene mindestens einseitig - z. B. durch eine Beschichtung - versiegelt
ist 25. Figure 7B
It is also possible to use a bipolar plate made of a completely porous material, which at least on one side - e.g. B. by a coating - is sealed 25.
Claims (7)
- - daß die Gaskanäle zumindest teilweise mit einer flüssigkeitstransportierenden Schicht ausgekleidet sind,
- - daß diese flüssigkeitstransportierende Schicht in einem Bereich beginnt, in dem der thermodynamische Zustand des Gasstroms unterhalb des Taupunkts der Wassersättigung liegt und in einem Bereich endet, in dem der thermody namische Zustand des Gasstroms über dem Taupunkt liegt, d. h. in dem Was ser auskondensiert.
- - daß diese Schicht zumindest einen Teil des bei der Brennstoffzellenreaktion entstehenden Produktwassers in einem Zellbereich, in dem der thermodyna mische Zustand des Gasstroms oberhalb des Taupunkts der Wassersättigung liegt, aufnimmt, in einen Bereich transportiert, in dem der thermodynamische Zustand des Gasstroms unterhalb des Taupunkts liegt, d. h. der Gasstrom noch ungesättigt ist, und diesen dort an den Gasstrom abgibt.
- that the gas channels are at least partially lined with a liquid-transporting layer,
- - That this liquid-transporting layer begins in an area in which the thermodynamic state of the gas flow is below the dew point of the water saturation and ends in an area in which the thermody namic state of the gas flow is above the dew point, ie in which water condenses.
- - That this layer takes up at least a portion of the product water formed in the fuel cell reaction in a cell area in which the thermodynamic state of the gas flow is above the dew point of water saturation, transported into an area in which the thermodynamic state of the gas flow is below the dew point , ie the gas stream is still unsaturated, and releases it there to the gas stream.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE19921007A DE19921007C1 (en) | 1999-05-06 | 1999-05-06 | PEM fuel cell with membrane electrode assembly has gas channels integrated in bipolar plates cladded with fluid transporting layer for damping membranes via condensed water |
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Application Number | Priority Date | Filing Date | Title |
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DE19921007A DE19921007C1 (en) | 1999-05-06 | 1999-05-06 | PEM fuel cell with membrane electrode assembly has gas channels integrated in bipolar plates cladded with fluid transporting layer for damping membranes via condensed water |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001061775A2 (en) * | 2000-02-17 | 2001-08-23 | Nedstack Holding B.V. | Water removal in pem fuel cells |
WO2004021497A2 (en) * | 2002-08-07 | 2004-03-11 | Battelle Memorial Institute | Passive vapor exchange systems and techniques for fuel reforming and prevention of carbon fouling |
WO2005004265A1 (en) * | 2003-06-30 | 2005-01-13 | Paul Scherrer Institut | Method and apparatus for internal humidification of the membrane of a fuel cell |
EP1920486A1 (en) * | 2005-07-15 | 2008-05-14 | UTC Power Corporation | Single plate pem fuel cell |
DE102009011239A1 (en) * | 2009-03-02 | 2010-09-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Low-temperature fuel cell with integrated water management system for the passive discharge of product water |
DE102017212067A1 (en) * | 2017-07-14 | 2019-01-17 | Bayerische Motoren Werke Aktiengesellschaft | Fuel cell stack and its stacking elements |
DE102020202061A1 (en) | 2020-02-19 | 2021-08-19 | Robert Bosch Gesellschaft mit beschränkter Haftung | Surface structure for separating water in a fuel cell system |
US11695134B2 (en) | 2018-06-07 | 2023-07-04 | Volkswagen Ag | Method for humidifying a reactant, and fuel cell system for carrying out the method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5529855A (en) * | 1992-12-24 | 1996-06-25 | Tanaka Kikinzoku Kogyo K.K. | Structure for wetting diaphragm of solid polymer electolyte electrochemical cell and process of preparing same |
-
1999
- 1999-05-06 DE DE19921007A patent/DE19921007C1/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5529855A (en) * | 1992-12-24 | 1996-06-25 | Tanaka Kikinzoku Kogyo K.K. | Structure for wetting diaphragm of solid polymer electolyte electrochemical cell and process of preparing same |
Non-Patent Citations (1)
Title |
---|
DE-Z: Bild der Wissenschaft, 2/1998, 1b-21 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001061775A2 (en) * | 2000-02-17 | 2001-08-23 | Nedstack Holding B.V. | Water removal in pem fuel cells |
WO2001061775A3 (en) * | 2000-02-17 | 2002-08-22 | Nedstack Holding B V | Water removal in pem fuel cells |
WO2004021497A2 (en) * | 2002-08-07 | 2004-03-11 | Battelle Memorial Institute | Passive vapor exchange systems and techniques for fuel reforming and prevention of carbon fouling |
WO2004021497A3 (en) * | 2002-08-07 | 2005-09-22 | Battelle Memorial Institute | Passive vapor exchange systems and techniques for fuel reforming and prevention of carbon fouling |
WO2005004265A1 (en) * | 2003-06-30 | 2005-01-13 | Paul Scherrer Institut | Method and apparatus for internal humidification of the membrane of a fuel cell |
JP2009501421A (en) * | 2005-07-15 | 2009-01-15 | ユーティーシー パワー コーポレイション | Single plate proton exchange membrane fuel cell |
EP1920486A1 (en) * | 2005-07-15 | 2008-05-14 | UTC Power Corporation | Single plate pem fuel cell |
EP1920486A4 (en) * | 2005-07-15 | 2009-10-21 | Utc Power Corp | Single plate pem fuel cell |
US7871732B2 (en) | 2005-07-15 | 2011-01-18 | Utc Power Corporation | Single reactant gas flow field plate PEM fuel cell |
CN101238604B (en) * | 2005-07-15 | 2011-11-16 | Utc电力公司 | Single plate PEM fuel cell |
DE102009011239A1 (en) * | 2009-03-02 | 2010-09-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Low-temperature fuel cell with integrated water management system for the passive discharge of product water |
DE102017212067A1 (en) * | 2017-07-14 | 2019-01-17 | Bayerische Motoren Werke Aktiengesellschaft | Fuel cell stack and its stacking elements |
US11695134B2 (en) | 2018-06-07 | 2023-07-04 | Volkswagen Ag | Method for humidifying a reactant, and fuel cell system for carrying out the method |
DE102020202061A1 (en) | 2020-02-19 | 2021-08-19 | Robert Bosch Gesellschaft mit beschränkter Haftung | Surface structure for separating water in a fuel cell system |
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