WO2012079659A1 - Method for producing a bipolar plate and bipolar plate for a fuel cell - Google Patents

Method for producing a bipolar plate and bipolar plate for a fuel cell Download PDF

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Publication number
WO2012079659A1
WO2012079659A1 PCT/EP2011/005148 EP2011005148W WO2012079659A1 WO 2012079659 A1 WO2012079659 A1 WO 2012079659A1 EP 2011005148 W EP2011005148 W EP 2011005148W WO 2012079659 A1 WO2012079659 A1 WO 2012079659A1
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WO
WIPO (PCT)
Prior art keywords
plate
adhesive
cathode
anode
cathode plate
Prior art date
Application number
PCT/EP2011/005148
Other languages
German (de)
French (fr)
Inventor
Christian Martin Erdmann
Arle-Stephan Koller
Original Assignee
Daimler Ag
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Filing date
Publication date
Application filed by Daimler Ag filed Critical Daimler Ag
Publication of WO2012079659A1 publication Critical patent/WO2012079659A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0206—Metals or alloys
    • H01M8/0208—Alloys
    • H01M8/021—Alloys based on iron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
    • 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
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • 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
    • H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
    • 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
    • H01M8/2465—Details of groupings of fuel cells
    • 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
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • 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 method for producing a bipolar plate, in which an anode plate and a cathode plate are joined together.
  • the invention further relates to a bipolar plate for a fuel cell, comprising an anode plate and a cathode plate joined thereto.
  • Fuel cells and methods for their production are generally known from the prior art, wherein a fuel cell comprises a fuel cell stack, also called a fuel cell stack.
  • a fuel cell comprises a fuel cell stack, also called a fuel cell stack.
  • bipolar plates form electrodes which are each connected by a membrane, in particular a membrane-electrode unit (im
  • the bipolar plates are made of a single plate or two interconnected plates, i. H. an anode plate and a cathode plate.
  • the anode plate and cathode plate are produced in a one-off production by forming steel sheets and then joined by laser welding. It varies depending on a linear propagation of the laser radiation and a
  • Laser beam length one cycle time for the joining of the anode plate and cathode plate to the bipolar plate.
  • the invention is based on the object, an improved over the prior art method for producing a bipolar plate and an improved
  • an anode plate and a cathode plate are joined together. According to the invention is between the
  • Anode plate and the cathode plate an adhesive introduced by means of which the anode plate and the cathode plate are glued together.
  • Adhesive process reduces certain cycle times and thus the joining of the plates is significantly accelerated by means of the gluing process, so that a higher
  • Bipolar plate can be achieved.
  • the bonding takes place in such a way that the anode plate and cathode plate are in direct electrical contact.
  • the electrical contact is realized by means of the adhesive, for which purpose, according to a development of the method according to the invention, the adhesive is admixed with electrically conductive particles.
  • FIG. 1 schematically shows a bipolar plate according to the invention in a plan view
  • FIG. 2 schematically shows an anode plate
  • FIG. 3 shows schematically a cathode plate
  • FIG. 1 shows a sectional representation during a joining process
  • Fig. 5 shows schematically a detail of a first embodiment of
  • Bipolar plate according to the invention according to Figure 1 in a sectional view in a joined region
  • Fig. 6 shows schematically a detail of a second embodiment of
  • Bipolar plate according to the invention according to Figure 1 in a sectional view in a joined region.
  • FIG. 1 shows a bipolar plate 1 according to the invention.
  • Fuel cell stack with membrane electrode units also not shown alternately stacked.
  • a plurality of the fuel cell stacks formed are electrically connected in series and stacked plane-parallel one above the other and form one or more fuel cells.
  • Each of these fuel cells has electrodes in the form of Gas diffusion electrodes, an anode, a cathode and an electrolyte disposed therebetween, in particular an electrolyte membrane, which together form the membrane electrode assembly.
  • the respective bipolar plate 1 arranged between two membrane-electrode units serves in this case for the spacing of the membrane-electrode units, the distribution of reactants for the fuel cell via the adjacent membrane-electrode units and the removal of the reactants in each case provided for this purpose the membrane-electrode units open towards, shown in more detail in Figure 4
  • the bipolar plate 1 serves to dissipate the heat of reaction via a coolant conducted in separate coolant channels, not shown, and to establish an electrical connection between the anode and the cathode of adjacent membrane-electrode assemblies.
  • the reactants used are a fuel and an oxidizing agent.
  • gaseous reactants so-called reaction gases are used, wherein the reaction gases, for example, hydrogen or a hydrogen-containing gas, such as.
  • reformate gas as fuel and oxygen or an oxygen-containing gas such.
  • air as an oxidizing agent.
  • Reactants are all substances involved in the electrochemical reaction, including the reaction products P, such as. B. water or
  • the respective bipolar plate 1 consists of two plane-parallel interconnected moldings, which are formed as plates.
  • one of the plates serves as shown in detail in Figure 2 anode plate 1.1 for connection to the anode of the membrane electrode assembly and the remaining of the plates as shown in more detail in Figure 3 cathode plate 1.2 for connection to the cathode of the other membrane electrode unit.
  • Anodenplatte 1.1 are arranged according to Figure 4 formed as anode channels channels SK1 for distribution of the fuel along a membrane-electrode unit, wherein at the other membrane electrode unit facing surface of the cathode plate 1.2 formed as a cathode channels SK2 channels to distribute the Oxidizer are arranged above the other membrane electrode assembly.
  • Membrane electrode units are inserted between the bipolar plate 1 and the membrane electrode assemblies sealing elements.
  • the sealing elements are preferably formed as a form of seals.
  • FIG. 2 shows the anode plate 1.1.
  • the anode plate 1.1 is preferably made
  • Such an advantageously used stainless steel has in particular the material number 1.4404.
  • the cathode plate 1.2 is shown.
  • the cathode plate 1.2 is preferably formed of stainless steel.
  • a stainless steel which can be used advantageously has, in particular, the material number 1.4404.
  • Figure 4 shows the bipolar plate 1 according to the invention in a sectional view, wherein the anode plate 1.1 and the cathode plate 1.2 are connected to each other by means of an adhesive K.
  • the bottom elements of the channels SK1, SK2 are in the active region of the anode plate 1.1 and the cathode plate 1.2.
  • the adhesive K is applied in a manner not shown in an outer sealing region of the anode plate 1.1 and / or the cathode plate 1.2.
  • a viscosity of the adhesive K is adjusted depending on the material and a design, in particular a structure of a surface of the anode plate 1.1 and cathode plate 1.2.
  • the adhesive K is designed such that it is activated when pressure is applied and hardens.
  • the anode plate 1.1 and the cathode plate 1.2 are heated to activate and cure the adhesive K. The heating takes place in the illustrated
  • Embodiment inductively, for which purpose at least one induction coil 2 is provided.
  • the heating is carried out, for example, by radiation or in an oven, in particular a so-called continuous furnace.
  • activators are added, which are excited when exposed to heat and pressure such that the activation and curing in a short time.
  • the adhesive K is formed such that an adhesion of the adhesive K is automatically activated upon contact with the anode plate 1.1 and / or the cathode plate 1.2.
  • the adhesive K is chemically reactive to the material of
  • Anodenplatte 1.1 and cathode plate 1.2 is formed so that this in contact with the material, in particular the stainless steel with the material number 1.4404, so reacts with this, that there is a particularly rapid adhesion of the adhesive K to the anode plate 1.1 and cathode plate 1.2.
  • FIG. 5 shows a detail of a first exemplary embodiment of the bipolar plate 1 according to the invention in the joined area provided with the adhesive K
  • the anode plate 1.1 and the cathode plate 1.2 are connected to one another during the joining process such that they touch each other directly at least in sections and form a direct and electrically conductive connection between the anode plate 1.1 and the cathode plate 1.2. Between the direct
  • Touch areas of the adhesive K is arranged, by means of which the bonding of the anode plate 1.1 and the cathode plate 1.2 is generated.
  • FIG. 6 shows a section of a second exemplary embodiment of FIG.
  • Bipolar plate 1 in the joined and provided with the adhesive K region of the anode plate 1.1 and the cathode plate 1.2.
  • the adhesive K is electrically conductive.
  • the adhesive K comprises electrically conductive particles P.
  • Anodenplatte 1.1 and the cathode plate 1.2 is a large-scale connection of the anode plate 1.1 and the cathode plate 1.2 can be generated, which is characterized by a particularly low electrical resistance. This results in a high electrical performance of the bipolar plate 1. Furthermore, on the basis of the admixture of different amounts of the particles P and / or by means of a selection of the type and the material of the particles P, the desired electrical conductivity between the
  • Anode plate 1.1 and the cathode plate 1.2 variably predetermined.

Abstract

The invention relates to a method for producing a bipolar plate (1), in which an anode plate (1.1) and a cathode plate (1.2) are joined to each other. According to the invention, an adhesive (K) is introduced between the anode plate (1.1) and the cathode plate (1.2), wherein by means of said adhesive the anode plate (1.1) and the cathode plate (1.2) are glued to each other. The invention further relates to a bipolar plate (1) for a fuel cell, comprising an anode plate (1.1) and a cathode plate (1.2) joined thereto. According to the invention, the anode plate (1.1) and the cathode plate (1.2) are joined to each other by means of an adhesive (K).

Description

Verfahren zur Herstellung einer Bipolarplatte und Bipolarplatte für eine Brennstoffzelle  Method for producing a bipolar plate and bipolar plate for a fuel cell
Die Erfindung betrifft ein Verfahren zur Herstellung einer Bipolarplatte, bei dem eine Anodenplatte und eine Kathodenplatte miteinander gefügt werden. The invention relates to a method for producing a bipolar plate, in which an anode plate and a cathode plate are joined together.
Die Erfindung betrifft weiterhin eine Bipolarplatte für eine Brennstoffzelle, umfassend eine Anodenplatte und eine mit dieser gefügte Kathodenplatte. The invention further relates to a bipolar plate for a fuel cell, comprising an anode plate and a cathode plate joined thereto.
Aus dem Stand der Technik sind allgemein Brennstoffzellen und Verfahren zu deren Herstellung bekannt, wobei eine Brennstoffzelle einen Brennstoffzellenstapel, auch Brennstoffzellenstack genannt, umfasst. Dabei bilden Bipolarplatten Elektroden, welche jeweils durch eine Membran, insbesondere eine Membran-Elektroden-Einheit (im Fuel cells and methods for their production are generally known from the prior art, wherein a fuel cell comprises a fuel cell stack, also called a fuel cell stack. In this case, bipolar plates form electrodes which are each connected by a membrane, in particular a membrane-electrode unit (im
Englischen: membrane electrode assembly) oder ein Elektrolyt elektrisch voneinander getrennt sind. Die Bipolarplatten sind aus einer einzelnen Platte oder zwei miteinander verbundenen Platten, d. h. einer Anodenplatte und einer Kathodenplatte, gebildet. Die Anodenplatte und Kathodenplatte werden in einer Einzelfertigung durch Umformung von Stahlblechen erzeugt und anschließend mittels Laserschweißen gefügt. Dabei variiert in Abhängigkeit einer linienförmigen Ausbreitung der Laserstrahlung und einer English: membrane electrode assembly) or an electrolyte are electrically isolated from each other. The bipolar plates are made of a single plate or two interconnected plates, i. H. an anode plate and a cathode plate. The anode plate and cathode plate are produced in a one-off production by forming steel sheets and then joined by laser welding. It varies depending on a linear propagation of the laser radiation and a
Laserstrahllänge eine Taktzeit für das Fügen der Anodenplatte und Kathodenplatte zur Bipolarplatte. Laser beam length one cycle time for the joining of the anode plate and cathode plate to the bipolar plate.
Der Erfindung liegt die Aufgabe zugrunde, ein gegenüber dem Stand der Technik verbessertes Verfahren zur Herstellung einer Bipolarplatte und eine verbesserte The invention is based on the object, an improved over the prior art method for producing a bipolar plate and an improved
Bipolarplatte für eine Brennstoffzelle anzugeben. Specify bipolar plate for a fuel cell.
Hinsichtlich des Verfahrens wird die Aufgabe erfindungsgemäß durch die im Anspruch 1 angegebenen Merkmale und hinsichtlich der Bipolarplatte durch die im Anspruch 8 angegebenen Merkmale gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche. With regard to the method, the object is achieved by the features specified in claim 1 and in terms of the bipolar plate by the features specified in claim 8. Advantageous embodiments of the invention are the subject of the dependent claims.
In einem Verfahren zur Herstellung einer Bipolarplatte werden eine Anodenplatte und eine Kathodenplatte miteinander gefügt. Erfindungsgemäß wird zwischen die In a method of manufacturing a bipolar plate, an anode plate and a cathode plate are joined together. According to the invention is between the
Anodenplatte und die Kathodenplatte ein Klebstoff eingebracht, mittels welchem die Anodenplatte und die Kathodenplatte miteinander verklebt werden. Anode plate and the cathode plate, an adhesive introduced by means of which the anode plate and the cathode plate are glued together.
Aus der Verklebung der Anodenplatte und der Kathodenplatte resultiert insbesondere gegenüber einer Verschweißung oder anderen thermischen Verfahren zur Erzeugung eines Stoffschlusses der Vorteil, dass eine Korrosionsbeständigkeit der Anodenplatte und Kathodenplatte nicht negativ beeinflusst wird. Weiterhin werden die durch den From the bonding of the anode plate and the cathode plate results in particular against a weld or other thermal methods for producing a material bond the advantage that corrosion resistance of the anode plate and cathode plate is not adversely affected. Furthermore, by the
Klebeprozess bestimmten Taktzeiten verringert und somit wird das Fügen der Platten mittels des Klebeprozesses wesentlich beschleunigt, so dass eine höhere Adhesive process reduces certain cycle times and thus the joining of the plates is significantly accelerated by means of the gluing process, so that a higher
Ausbringungsmenge und eine hohe Wirtschaftlichkeit bei der Herstellung der Application rate and high efficiency in the production of
Bipolarplatte erzielbar sind. Bipolar plate can be achieved.
Die Verklebung erfolgt dabei in der Art, dass die Anodenplatte und Kathodenplatte in direktem elektrischen Kontakt stehen. Alternativ oder zusätzlich wird der elektrische Kontakt mittels des Klebstoffs realisiert, wobei hierzu gemäß einer Weiterbildung des erfindungsgemäßen Verfahrens dem Klebstoff elektrisch leitfähige Partikel beigemengt werden. The bonding takes place in such a way that the anode plate and cathode plate are in direct electrical contact. Alternatively or additionally, the electrical contact is realized by means of the adhesive, for which purpose, according to a development of the method according to the invention, the adhesive is admixed with electrically conductive particles.
Aufgrund einer derartigen direkten und/oder indirekten Verbindung der Anodenplatte und Kathodenplatte sind große elektrische Kontaktflächen zwischen der Anodenplatte und Kathodenplatte realisierbar. Dadurch wird ein Elektronenfluss, d. h. eine elektrische Leitfähigkeit zwischen der Anodenplatte und der Kathodenplatte verbessert und somit eine Leistungsfähigkeit der Bipolarplatte erhöht, woraus sich eine erhöhte Qualität und Leistungsfähigkeit des aus den Bipolarplatten gebildeten Brennstoffzellenstapels ergibt. Aus der Erhöhung der elektrischen Leitfähigkeit des Brennstoffzellenstapels ergibt sich in besonders vorteilhafter Weise die Möglichkeit, die Größe des Brennstoffzellenstapels bei gleichbleibender Leistung, wie sie herkömmliche Brennstoffzellenstapel aufweisen, zu verkleinern. Mit anderen Worten: Es sind weniger Bipolarplatten zur Erzeugung der gleichen elektrischen Leistung erforderlich. Aus der Verwendung des erfindungsgemäßen Verfahrens ergibt sich insbesondere die Möglichkeit, 40 % oder mehr Bipolarplatten einzusparen. Aufgrund der hohen elektrischen Leitfähigkeit und der gleichmäßigen Verbindung der Anodenplatte und Kathodenplatte resultiert eine erhöhte Qualität der Bipolarplatte und somit eine erhöhte Lebensdauer des Brennstoffzellenstapels. Due to such a direct and / or indirect connection of the anode plate and cathode plate large electrical contact surfaces between the anode plate and cathode plate can be realized. As a result, an electron flow, ie, an electrical conductivity between the anode plate and the cathode plate is improved, thus increasing a performance of the bipolar plate, resulting in an increased quality and performance of the fuel cell stack formed from the bipolar plates. From the increase in the electrical conductivity of the fuel cell stack results in a particularly advantageous manner, the possibility of reducing the size of the fuel cell stack with the same performance as conventional fuel cell stack to reduce. In other words, fewer bipolar plates are required to produce the same electrical power. From the use of the method according to the invention results in particular the possibility of saving 40% or more bipolar plates. Due to the high electrical conductivity and the uniform Connection of the anode plate and cathode plate results in an increased quality of the bipolar plate and thus an increased life of the fuel cell stack.
Ausführungsbeispiele der Erfindung werden im Folgenden anhand von Zeichnungen näher erläutert. Embodiments of the invention are explained in more detail below with reference to drawings.
Dabei zeigen: Showing:
Fig. 1 schematisch eine erfindungsgemäße Bipolarplatte in einer Draufsicht, Fig. 2 schematisch eine Anodenplatte, Fig. 3 schematisch eine Kathodenplatte, 1 schematically shows a bipolar plate according to the invention in a plan view, FIG. 2 schematically shows an anode plate, FIG. 3 shows schematically a cathode plate,
Fig. 4 schematisch einen Ausschnitt der erfindungsgemäßen Bipolarplatte gemäß 4 schematically shows a detail of the bipolar plate according to the invention
Figur 1 in einer Schnittdarstellung während eines Fügeprozesses,  FIG. 1 shows a sectional representation during a joining process,
Fig. 5 schematisch einen Ausschnitt eines ersten Ausführungsbeispiels der Fig. 5 shows schematically a detail of a first embodiment of
erfindungsgemäßen Bipolarplatte gemäß Figur 1 in einer Schnittdarstellung in einem gefügten Bereich und  Bipolar plate according to the invention according to Figure 1 in a sectional view in a joined region and
Fig. 6 schematisch einen Ausschnitt eines zweiten Ausführungsbeispiels der Fig. 6 shows schematically a detail of a second embodiment of
erfindungsgemäßen Bipolarplatte gemäß Figur 1 in einer Schnittdarstellung in einem gefügten Bereich.  Bipolar plate according to the invention according to Figure 1 in a sectional view in a joined region.
Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen. Corresponding parts are provided in all figures with the same reference numerals.
In Figur 1 ist eine erfindungsgemäße Bipolarplatte 1 dargestellt. FIG. 1 shows a bipolar plate 1 according to the invention.
Mehrere Bipolarplatten 1 werden zur Erzeugung eines nicht näher dargestellten Several bipolar plates 1 are used to produce a non-illustrated
Brennstoffzellenstapels mit ebenfalls nicht näher dargestellten Membran-Elektroden- Einheiten abwechselnd übereinander gestapelt. Fuel cell stack with membrane electrode units also not shown alternately stacked.
Vorzugsweise werden mehrere der gebildeten Brennstoffzellenstapel elektrisch in Serie geschaltet und planparallel übereinander gestapelt und bilden eine oder mehrere Brennstoffzellen. Jede dieser Brennstoffzellen weist als Elektroden in Form von Gasdiffusionselektroden eine Anode, eine Kathode und einen dazwischen angeordneten Elektrolyt, insbesondere eine Elektrolytmembran, auf, die zusammen die Membran- Elektroden-Einheit bilden. Preferably, a plurality of the fuel cell stacks formed are electrically connected in series and stacked plane-parallel one above the other and form one or more fuel cells. Each of these fuel cells has electrodes in the form of Gas diffusion electrodes, an anode, a cathode and an electrolyte disposed therebetween, in particular an electrolyte membrane, which together form the membrane electrode assembly.
Die jeweilige, zwischen zwei Membran-Elektroden-Einheiten angeordnete Bipolarplatte 1 dient dabei der Beabstandung der Membran-Elektroden-Einheiten, dem Verteilen von Reaktionsstoffen für die Brennstoffzelle über die angrenzenden Membran-Elektroden- Einheiten und dem Abführen der Reaktionsstoffe in hierfür vorgesehenen, jeweils zu den Membran-Elektroden-Einheiten hin offenen, in Figur 4 näher dargestellten The respective bipolar plate 1 arranged between two membrane-electrode units serves in this case for the spacing of the membrane-electrode units, the distribution of reactants for the fuel cell via the adjacent membrane-electrode units and the removal of the reactants in each case provided for this purpose the membrane-electrode units open towards, shown in more detail in Figure 4
Kanälen SK1 , SK2. Weiterhin dient die Bipolarplatte 1 der Abfuhr der Reaktionswärme über ein in separaten, nicht gezeigten Kühlmittelkanälen geführtes Kühlmittel sowie der Herstellung einer elektrischen Verbindung zwischen der Anode und der Kathode von benachbarten Membran-Elektroden-Einheiten. Channels SK1, SK2. Furthermore, the bipolar plate 1 serves to dissipate the heat of reaction via a coolant conducted in separate coolant channels, not shown, and to establish an electrical connection between the anode and the cathode of adjacent membrane-electrode assemblies.
Als Reaktionsstoffe werden ein Brennstoff und ein Oxidationsmittel eingesetzt. Dabei werden vorzugsweise gasförmige Reaktionsstoffe, sogenannte Reaktionsgase, eingesetzt, wobei die Reaktionsgase beispielsweise Wasserstoff oder ein Wasserstoff enthaltendes Gas, wie z. B. ein sogenanntes Reformatgas, als Brennstoff und Sauerstoff oder ein Sauerstoff enthaltendes Gas, wie z. B. Luft, als Oxidationsmittel umfassen. Unter Reaktionsstoffen werden alle an der elektrochemischen Reaktion beteiligten Stoffe verstanden, einschließlich der Reaktionsprodukte P, wie z. B. Wasser oder The reactants used are a fuel and an oxidizing agent. In this case, preferably gaseous reactants, so-called reaction gases are used, wherein the reaction gases, for example, hydrogen or a hydrogen-containing gas, such as. As a so-called reformate gas, as fuel and oxygen or an oxygen-containing gas such. As air, as an oxidizing agent. Reactants are all substances involved in the electrochemical reaction, including the reaction products P, such as. B. water or
Restbrenngas. Residual fuel gas.
Die jeweilige Bipolarplatte 1 besteht dabei aus zwei planparallel miteinander verbundenen Formteilen, welche als Platten ausgebildet sind. Dabei dient eine der Platten als in Figur 2 näher dargestellte Anodenplatte 1.1 zur Verbindung mit der Anode der Membran- Elektroden-Einheit und die verbleibende der Platten als in Figur 3 näher dargestellte Kathodenplatte 1.2 zur Verbindung mit der Kathode der anderen Membran-Elektroden- Einheit. The respective bipolar plate 1 consists of two plane-parallel interconnected moldings, which are formed as plates. In this case, one of the plates serves as shown in detail in Figure 2 anode plate 1.1 for connection to the anode of the membrane electrode assembly and the remaining of the plates as shown in more detail in Figure 3 cathode plate 1.2 for connection to the cathode of the other membrane electrode unit.
An der der einen Membran-Elektroden-Einheit zugewandten Oberfläche der At the one of the membrane electrode unit surface facing the
Anodenplatte 1.1 sind gemäß Figur 4 die als Anodenkanäle ausgebildete Kanäle SK1 zur Verteilung des Brennstoffs entlang der einen Membran-Elektroden-Einheit angeordnet, wobei an der der anderen Membran-Elektroden-Einheit zugewandten Oberfläche der Kathodenplatte 1.2 die als Kathodenkanäle ausgebildeten Kanäle SK2 zur Verteilung des Oxidators über der anderen Membran-Elektroden-Einheit angeordnet sind. Die Anodenplatte 1.1 are arranged according to Figure 4 formed as anode channels channels SK1 for distribution of the fuel along a membrane-electrode unit, wherein at the other membrane electrode unit facing surface of the cathode plate 1.2 formed as a cathode channels SK2 channels to distribute the Oxidizer are arranged above the other membrane electrode assembly. The
Kathodenkanäle und die Anodenkanäle haben keine Verbindung miteinander. Zur Medienabdichtung und zur elektrischen Isolierung der Bipolarplatte 1 von den Cathode channels and the anode channels are not connected. For media sealing and electrical insulation of the bipolar plate 1 of the
Membran-Elektroden-Einheiten sind zwischen der Bipolarplatte 1 und den Membran- Elektroden-Einheiten Dichtungselemente eingebracht. Die Dichtungselemente sind dabei vorzugsweise als Formdichtungen ausgebildet. Membrane electrode units are inserted between the bipolar plate 1 and the membrane electrode assemblies sealing elements. The sealing elements are preferably formed as a form of seals.
Figur 2 zeigt die Anodenplatte 1.1. Die Anodenplatte 1.1 ist vorzugsweise aus FIG. 2 shows the anode plate 1.1. The anode plate 1.1 is preferably made
nichtrostendem Stahl gebildet. Ein solcher vorteilhaft einzusetzender nichtrostender Stahl weist insbesondere die Werkstoffnummer 1.4404 auf. made of stainless steel. Such an advantageously used stainless steel has in particular the material number 1.4404.
In Figur 3 ist die Kathodenplatte 1.2 dargestellt. Die Kathodenplatte 1.2 ist vorzugsweise aus nichtrostendem Stahl gebildet. Ebenso weist hierzu ein vorteilhaft einsetzbarer nichtrostender Stahl insbesondere die Werkstoffnummer 1.4404 auf. In Figure 3, the cathode plate 1.2 is shown. The cathode plate 1.2 is preferably formed of stainless steel. Likewise, a stainless steel which can be used advantageously has, in particular, the material number 1.4404.
Figur 4 zeigt die erfindungsgemäße Bipolarplatte 1 in einer Schnittdarstellung, wobei die Anodenplatte 1.1 und die Kathodenplatte 1.2 mittels eines Klebstoffs K miteinander verbunden sind. Figure 4 shows the bipolar plate 1 according to the invention in a sectional view, wherein the anode plate 1.1 and the cathode plate 1.2 are connected to each other by means of an adhesive K.
Zur Herstellung der Bipolarplatte 1 , d. h. des dargestellten Verbunds aus der For the preparation of the bipolar plate 1, d. H. of the illustrated composite of the
Anodenplatte 1.1 , der Kathodenplatte 1.2 und dem Klebstoff K wird der Klebstoff K auf Bodenelemente der Kanäle SK1 und/oder der Kanäle SK2 der Anodenplatte 1.1 und/oder der Kathodenplatte 1.2 auf jeweils den Kanälen SK1 und/oder Kanälen SK2 abgewandten und bei der Fügung der Anodenplatte 1.1 und der Kathoden platte 1.2 einander zugewandten Seiten aufgebracht. Die Bodenelemente der Kanäle SK1 , SK2 befinden im aktiven Bereich der Anodenplatte 1.1 bzw. der Kathodenplatte 1.2. Zusätzlich wird der Klebstoff K in nicht dargestellter Weise in einem Außendichtbereich der Anodenplatte 1.1 und/oder der Kathodenplatte 1.2 aufgebracht. Anode plate 1.1, the cathode plate 1.2 and the adhesive K, the adhesive K on bottom elements of the channels SK1 and / or the channels SK2 of the anode plate 1.1 and / or the cathode plate 1.2 on each of the channels SK1 and / or channels SK2 facing away and at the junction of the Anode plate 1.1 and the cathode plate 1.2 facing each other facing sides. The bottom elements of the channels SK1, SK2 are in the active region of the anode plate 1.1 and the cathode plate 1.2. In addition, the adhesive K is applied in a manner not shown in an outer sealing region of the anode plate 1.1 and / or the cathode plate 1.2.
Um eine besonders schnelle, gleichmäßige und vollständige Benetzung der zu To ensure a particularly fast, even and complete wetting of the
verklebenden Bereiche der Anodenplatte 1.1 und der Kathodenplatte 1.2 zu erzielen, wird in Abhängigkeit des Materials und einer Ausbildung, insbesondere einer Struktur einer Oberfläche der Anodenplatte 1.1 und Kathodenplatte 1.2 eine Viskosität des Klebstoffs K eingestellt. to achieve bonding areas of the anode plate 1.1 and the cathode plate 1.2, a viscosity of the adhesive K is adjusted depending on the material and a design, in particular a structure of a surface of the anode plate 1.1 and cathode plate 1.2.
Zur Verklebung der Anodenplatte 1.1 und der Kathoden platte 1.2 werden diese bei der Fügung mit Druck beaufschlagt. Der Klebstoff K ist dabei derart ausgebildet, dass dieser bei der Beaufschlagung mit Druck aktiviert wird und aushärtet. Zusätzlich werden die Anodenplatte 1.1 und die Kathodenplatte 1.2 zur Aktivierung und Aushärtung des Klebstoffs K erwärmt. Die Erwärmung erfolgt im dargestellten For bonding the anode plate 1.1 and the cathode plate 1.2, these are pressurized in the joining. The adhesive K is designed such that it is activated when pressure is applied and hardens. In addition, the anode plate 1.1 and the cathode plate 1.2 are heated to activate and cure the adhesive K. The heating takes place in the illustrated
Ausführungsbeispiel induktiv, wobei hierzu zumindest eine Induktionsspule 2 vorgesehen ist. Embodiment inductively, for which purpose at least one induction coil 2 is provided.
Alternativ oder zusätzlich wird die Erwärmung beispielsweise durch Strahlung oder in einem Ofen, insbesondere einem so genannten Durchlaufofen, durchgeführt. Alternatively or additionally, the heating is carried out, for example, by radiation or in an oven, in particular a so-called continuous furnace.
Zur weiteren Beschleunigung der Aktivierung und Aushärtung werden dem Klebstoff K zusätzlich Aktivatoren beigemengt, welche bei der Beaufschlagung mit Wärme und Druck derart angeregt werden, dass die Aktivierung und Aushärtung in kurzer Zeit erfolgen. To further accelerate the activation and curing of the adhesive K additionally activators are added, which are excited when exposed to heat and pressure such that the activation and curing in a short time.
Weiterhin ist der Klebstoff K derart ausgebildet, dass eine Adhäsion des Klebstoffs K bei einer Berührung mit der Anodenplatte 1.1 und/oder der Kathodenplatte 1.2 automatisch aktiviert wird. Hierzu ist der Klebstoff K chemisch reaktiv zum Material der Furthermore, the adhesive K is formed such that an adhesion of the adhesive K is automatically activated upon contact with the anode plate 1.1 and / or the cathode plate 1.2. For this purpose, the adhesive K is chemically reactive to the material of
Anodenplatte 1.1 und Kathodenplatte 1.2 ausgebildet, so dass dieser bei Berührung mit dem Material, insbesondere dem nichtrostenden Stahl mit der Werkstoffnummer 1.4404, derart mit diesem reagiert, dass es besonders schnell zu einer Adhäsion des Klebstoffs K an der Anodenplatte 1.1 und Kathodenplatte 1.2 kommt. Anodenplatte 1.1 and cathode plate 1.2 is formed so that this in contact with the material, in particular the stainless steel with the material number 1.4404, so reacts with this, that there is a particularly rapid adhesion of the adhesive K to the anode plate 1.1 and cathode plate 1.2.
In Figur 5 ist ein Ausschnitt eines ersten Ausführungsbeispiels der erfindungsgemäßen Bipolarplatte 1 im gefügten und mit dem Klebstoff K versehenen Bereich der FIG. 5 shows a detail of a first exemplary embodiment of the bipolar plate 1 according to the invention in the joined area provided with the adhesive K
Anodenplatte 1.1 und der Kathodenplatte 1.2 dargestellt. Anode plate 1.1 and the cathode plate 1.2 shown.
Die Anodenplatte 1.1 und die Kathodenplatte 1.2 werden während des Fügeprozesses derart miteinander verbunden, dass diese sich zumindest in Abschnitten unmittelbar berühren und sich zwischen der Anodenplatte 1.1 und die Kathodenplatte 1.2 eine direkte und elektrisch leitfähige Verbindung ausbildet. Zwischen den direkten The anode plate 1.1 and the cathode plate 1.2 are connected to one another during the joining process such that they touch each other directly at least in sections and form a direct and electrically conductive connection between the anode plate 1.1 and the cathode plate 1.2. Between the direct
Berührungsbereichen ist der Klebstoff K angeordnet, mittels welchem die Verklebung der Anodenplatte 1.1 und der Kathodenplatte 1.2 erzeugt wird. Touch areas of the adhesive K is arranged, by means of which the bonding of the anode plate 1.1 and the cathode plate 1.2 is generated.
Um eine möglichst schnelle und vollständige Aushärtung, insbesondere Polymerisation des Klebstoffs K zu erzielen, wird ein Klebstoff-Spalt KS und eine Dicke des Klebstoffs K zwischen der Anodenplatte 1.1 und der Kathodenplatte 1.2 möglichst gering gewählt. Figur 6 zeigt einen Ausschnitt eines zweiten Ausführungsbeispiels der In order to achieve the fastest possible and complete curing, in particular polymerization of the adhesive K, an adhesive gap KS and a thickness of the adhesive K between the anode plate 1.1 and the cathode plate 1.2 are selected as small as possible. FIG. 6 shows a section of a second exemplary embodiment of FIG
erfindungsgemäßen Bipolarplatte 1 im gefügten und mit dem Klebstoff K versehenen Bereich der Anodenplatte 1.1 und der Kathodenplatte 1.2. Bipolar plate 1 according to the invention in the joined and provided with the adhesive K region of the anode plate 1.1 and the cathode plate 1.2.
Im Unterschied zu dem in Figur 5 dargestellten Ausführungsbeispiel liegt keine unmittelbare Berührung der Anodenplatte 1.1 und der Kathodenplatte 1.2 im dargestellten Bereich vor. Um die elektrische Leitung zwischen der Anodenplatte 1.1 und der In contrast to the exemplary embodiment illustrated in FIG. 5, there is no direct contact of the anode plate 1.1 and the cathode plate 1.2 in the region shown. To the electrical line between the anode plate 1.1 and the
Kathodenplatte 1.2 zu erzeugen, ist der Klebstoff K elektrisch leitfähig ausgebildet. Hierzu umfasst der Klebstoff K elektrisch leitfähige Partikel P. To produce cathode plate 1.2, the adhesive K is electrically conductive. For this purpose, the adhesive K comprises electrically conductive particles P.
Bei dieser Ausbildung des Klebstoffs K und einem derartigen Verbund, der In this embodiment of the adhesive K and such a composite, the
Anodenplatte 1.1 und der Kathodenplatte 1.2 ist eine großflächige Verbindung der Anodenplatte 1.1 und der Kathodenplatte 1.2 erzeugbar, welche sich durch einen besonders geringen elektrischen Widerstand auszeichnet. Daraus resultiert eine hohe elektrische Leistungsfähigkeit der Bipolarplatte 1. Weiterhin ist anhand der Beimengung verschiedener Mengen der Partikel P und/oder mittels einer Auswahl der Art und dem Material der Partikel P die gewünschte elektrische Leitfähigkeit zwischen der Anodenplatte 1.1 and the cathode plate 1.2 is a large-scale connection of the anode plate 1.1 and the cathode plate 1.2 can be generated, which is characterized by a particularly low electrical resistance. This results in a high electrical performance of the bipolar plate 1. Furthermore, on the basis of the admixture of different amounts of the particles P and / or by means of a selection of the type and the material of the particles P, the desired electrical conductivity between the
Anodenplatte 1.1 und der Kathodenplatte 1.2 variabel vorgebbar. Anode plate 1.1 and the cathode plate 1.2 variably predetermined.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Bipolarplatte 1 bipolar plate
1.1 Anodenplatte  1.1 anode plate
1.2 Kathodenplatte  1.2 cathode plate
2 Induktionsspule  2 induction coil
K Klebstoff K glue
KS Klebstoffspalt  KS adhesive gap
P Partikel  P particles
SK1 Kanal  SK1 channel
SK2 Kanal  SK2 channel

Claims

Patentansprüche claims
1. Verfahren zur Herstellung einer Bipolarplatte (1 ), bei dem eine Anodenplatte (1.1 ) und eine Kathodenplatte (1.2) miteinander gefügt werden, 1. A method for producing a bipolar plate (1), in which an anode plate (1.1) and a cathode plate (1.2) are joined together,
dadurch gekennzeichnet, dass zwischen die Anodenplatte (1.1 ) und die  characterized in that between the anode plate (1.1) and the
Kathodenplatte (1.2) ein Klebstoff (K) eingebracht wird, mittels welchem die Anodenplatte (1.1) und die Kathodenplatte (1.2) miteinander verklebt werden.  Cathode plate (1.2) an adhesive (K) is introduced, by means of which the anode plate (1.1) and the cathode plate (1.2) are glued together.
2. Verfahren nach Anspruch 1 , 2. The method according to claim 1,
dadurch gekennzeichnet, dass eine Adhäsion des Klebstoffs (K) bei einer Berührung mit der Anodenplatte (1.1 ) und/oder der Kathodenplatte (1.2) automatisch aktiviert wird.  characterized in that an adhesion of the adhesive (K) upon contact with the anode plate (1.1) and / or the cathode plate (1.2) is automatically activated.
3. Verfahren nach Anspruch 1 oder 2, 3. The method according to claim 1 or 2,
dadurch gekennzeichnet, dass dem Klebstoff (K) Aktivatoren zur Beschleunigung einer Aktivierung und/oder Aushärtung des Klebstoffs (K) beigemengt werden.  characterized in that the adhesive (K) activators for accelerating an activation and / or curing of the adhesive (K) are added.
4. Verfahren nach einem der vorhergehenden Ansprüche, 4. The method according to any one of the preceding claims,
dadurch gekennzeichnet, dass in Abhängigkeit eines Materials und/oder einer Ausbildung einer Oberfläche der Anodenplatte (1.1) und/oder der  characterized in that, depending on a material and / or a formation of a surface of the anode plate (1.1) and / or the
Kathodenplatte (1.2) eine Viskosität des Klebstoffs (K) eingestellt wird.  Cathode plate (1.2) a viscosity of the adhesive (K) is adjusted.
5. Verfahren nach einem der vorhergehenden Ansprüche, 5. The method according to any one of the preceding claims,
dadurch gekennzeichnet, dass dem Klebstoff (K) elektrisch leitfähige Partikel (P) beigemengt werden. characterized in that the adhesive (K) electrically conductive particles (P) are added.
6. Verfahren nach einem der vorhergehenden Ansprüche, 6. The method according to any one of the preceding claims,
dadurch gekennzeichnet, dass die Anodenplatte (1.1), die Kathodenplatte (1.2) und/oder der Klebstoff (K) zu einer Aushärtung des Klebstoffs (K) erwärmt und/oder mit Druck beaufschlagt werden.  characterized in that the anode plate (1.1), the cathode plate (1.2) and / or the adhesive (K) are heated to a curing of the adhesive (K) and / or pressurized.
7. Verfahren nach einem der vorhergehenden Ansprüche, 7. The method according to any one of the preceding claims,
dadurch gekennzeichnet, dass der Klebstoff (K) auf einen Außendichtbereich und/oder einen aktiven Bereich der Anodenplatte (1.1) und/oder der  characterized in that the adhesive (K) to an outer sealing region and / or an active region of the anode plate (1.1) and / or the
Kathodenplatte (1.2) aufgebracht wird.  Cathode plate (1.2) is applied.
8. Bipolarplatte (1) für eine Brennstoffzelle, umfassend eine Anodenplatte (1.1) und eine mit dieser gefügte Kathodenplatte (1.2), 8. bipolar plate (1) for a fuel cell, comprising an anode plate (1.1) and a cathode plate (1.2) joined thereto,
dadurch gekennzeichnet, dass die Anodenplatte (1.1) und die Kathodenplatte (1.2) mittels eines Klebstoffs (K) miteinander verbunden sind.  characterized in that the anode plate (1.1) and the cathode plate (1.2) by means of an adhesive (K) are interconnected.
9. Bipolarplatte (1) nach Anspruch 8, 9. bipolar plate (1) according to claim 8,
dadurch gekennzeichnet, dass der Klebstoff (K) elektrisch leitfähige Partikel (P) umfasst.  characterized in that the adhesive (K) comprises electrically conductive particles (P).
10. Bipolarplatte (1) nach Anspruch 8 oder 9, 10. bipolar plate (1) according to claim 8 or 9,
dadurch gekennzeichnet, dass die Anodenplatte (1.1) und/oder die  characterized in that the anode plate (1.1) and / or the
Kathodenplatte (1.2) aus nichtrostendem Stahl gebildet sind.  Cathode plate (1.2) are made of stainless steel.
PCT/EP2011/005148 2010-12-18 2011-10-13 Method for producing a bipolar plate and bipolar plate for a fuel cell WO2012079659A1 (en)

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CN115084565A (en) * 2022-05-20 2022-09-20 苏州瀚川智能科技股份有限公司 Full-automatic dispensing and pressing device for fuel cell polar plate

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CN114023989A (en) * 2021-11-02 2022-02-08 上海电气集团股份有限公司 Bipolar plate and electric pile comprising same
CN114464838A (en) * 2022-02-16 2022-05-10 安徽瑞氢动力科技有限公司 Method for manufacturing fuel cell bipolar plate
CN115084565A (en) * 2022-05-20 2022-09-20 苏州瀚川智能科技股份有限公司 Full-automatic dispensing and pressing device for fuel cell polar plate

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