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DE202004016991U1 - Cooling element for proton exchange membrane fuel cell has two films rotated through 180 degrees, each with continuous distribution structures on half so continuous distribution structure extending over entire cell exists - Google Patents

Cooling element for proton exchange membrane fuel cell has two films rotated through 180 degrees, each with continuous distribution structures on half so continuous distribution structure extending over entire cell exists Download PDF

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Publication number
DE202004016991U1
DE202004016991U1 DE202004016991U DE202004016991U DE202004016991U1 DE 202004016991 U1 DE202004016991 U1 DE 202004016991U1 DE 202004016991 U DE202004016991 U DE 202004016991U DE 202004016991 U DE202004016991 U DE 202004016991U DE 202004016991 U1 DE202004016991 U1 DE 202004016991U1
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cooling element
continuous distribution
distribution structure
fuel cell
films
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Expired - Lifetime
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DE202004016991U
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German (de)
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INHOUSE ENGINEERING GMBH, DE
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SCHALT und REGELTECHNIK GmbH
SCHALT- und REGELTECHNIK GmbH
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    • 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
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
    • H01M8/04074—Heat exchange unit structures specially adapted for fuel cell
    • 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
    • H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
    • 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
    • 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
    • H01M8/0213—Gas-impermeable carbon-containing materials
    • 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
    • H01M8/0223—Composites
    • H01M8/0228—Composites in the form of layered or coated products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0267—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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric 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
    • H01M8/2465—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

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

Abstract

The cooling element has two films (1) rotated through 180 degrees, each with a continuous distribution structures on a half so that a continuous distribution structure extending over the entire cell exists. The distribution structure films are glued together and two separating plates (2) on the outer sides of the glued films give a sealed, separate cooling element.

Description

Die Erfindung betrifft eine Kühlelement für den Einsatz in einer PEM-Brennstoffzelle.The The invention relates to a cooling element for the Use in a PEM fuel cell.

Die Kühlung von PEM-Brennstoffzellen ist Bestandteil der Funktion und Konstruktion jeder PEM-Brennstoffzelle und ist als Stand der Technik vom Grunde her gegeben.The cooling of PEM fuel cells is part of the function and design every PEM fuel cell and is state of the art given here.

Bei den derzeitigen Kühlelementen für PEM-Brennstoffzellen gibt es zwei verschiedene Typen. Zum einen die sogenannte Bipolarplatte. Hierbei befindet sich zwischen der Anoden- und Kathodenseite zweier Zellen eine Kanalstruktur zur Führung des Kühlmediums. Dabei liegt die Kanalstruktur entweder auf der Anoden- oder der Kathodenseite vor, wobei dann die jeweils gegenüberliegende Seite eine planare Fläche aufweist.at the current cooling elements for PEM fuel cells There are two different types. First, the so-called bipolar plate. Here is located between the anode and cathode side of two Cells a channel structure to guide the Cooling medium. The channel structure is either on the anode or the Cathode side before, in which case the opposite side is a planar area having.

Es ist auch eine Kanalstruktur auf der Anoden- und Kathodenseite bekannt, so dass diese zusammengeführt den Kanal für die Kühlflüssigkeit bilden.It is also a channel structure on the anode and cathode side known so that these merged the channel for the cooling liquid form.

Der zweite Typ ist ein separates Kühlelement. Das Element weist zwei planare Oberflächen auf und im inneren befindet sich die Kanalstruktur zum Transport des Kühlmediums. Diese Typen sind beispielhaft in den deutschen Patentenanmeldungen DE10162871A1 und DE10015360A1 beschrieben.Of the second type is a separate cooling element. The element has two planar surfaces and is located inside the channel structure to transport the cooling medium. These types are exemplary in the German patent applications DE10162871A1 and DE10015360A1 described.

Nachteilig an diesen Konstruktionen ist der Platzbedarf im Brennstoffzellen-Stack. Solche Kühlelemente führen daher regelmäßig zu einer nachteiligen Vergrößerung des Brennstoffzellenstapels. Zudem stellen separate Kühlelemente weitere Komponenten im Brennstoffzellenstapel des Stack dar, dessen Zusammenbau dadurch erschwert wird.adversely These constructions require space in the fuel cell stack. Such cooling elements to lead therefore regularly to one disadvantageous enlargement of the Fuel cell stack. In addition, separate cooling elements other components in the fuel cell stack of the stack, whose Assembly is made difficult.

Aufgabe der Erfindung ist es, ein Kühlelement zu schaffen, welches als eigenständiges Element der PEM-Brennstoffzelle ausgebildet ist, eine dünne Bauweise besitzt und einfach und kostengünstig herzustellen ist.task The invention is a cooling element to create, which as an independent Element of the PEM fuel cell is formed, a thin design owns and easy and inexpensive is to produce.

Die Aufgabe wird erfindungsgemäß durch ein Kühlelement mit der Gesamtheit der Merkmale gemäß Hauptanspruch gelöst. Vorteilhafte Ausführungsformen des Kühlelementes ergeben sich aus den Unteransprüchen.The The object is achieved by a cooling element solved with the totality of the features according to the main claim. advantageous embodiments of the cooling element emerge from the dependent claims.

Das Kühlelement besteht aus zwei baugleichen Folien (1), die eine halbe Verteilungsstruktur aufweisen. Die durchgehende Kanalstruktur der Folien wird mittels einer einfachen Bearbeitungsmethode, z.B. Wasser-, Laserstrahl, Stanzen... gefertigt.The cooling element consists of two identical foils ( 1 ) having a half distribution structure. The continuous channel structure of the films is produced by means of a simple processing method, eg water, laser, punching.

Als Kanalstruktur bieten sich beispielsweise Mäander, parallele Kanäle oder einzelne Stege in unterschiedlicher Anordnung mit Zufluß- und Abflußkanal an.When Channel structure, for example meanders, parallel channels or individual webs in different arrangement with inflow and outflow channel.

Durch Drehung der zweiten Folie um 180° zur ersten Folie entsteht beim Verbinden z.B. Verkleben eine durchgängige, über das gesamte Element ausgedehnte Verteilungsstruktur.By Rotation of the second film by 180 ° to first film is formed when bonding e.g. Glue a continuous, over that entire element extended distribution structure.

Das erfindungsgemäße Kühlelement ist aus Graphit oder einem, für Brennstoffzellen geeignetem, Edelstahl, dessen gute Leitfähigkeit durch entsprechende Verfahren, bei dem keine Oberflächenpassivierung auftritt, erhalten bleibt. Das Kühlelement ist demzufolge elektrisch gut leitend.The Cooling element according to the invention is made of graphite or a, for Fuel cell suitable, stainless steel, its good conductivity by appropriate methods, in which no surface passivation occurs, is preserved. The cooling element is therefore electrically good conductive.

Die Trennwand (2) ist eine beidseitig planare Folie, die ebenso aus den vorgenannten Material besteht.The partition ( 2 ) is a bilaterally planar film, which also consists of the aforementioned material.

Das aus den zwei baugleichen Folien bestehende Kühlelement kann auch ohne Trennwände direkt zwischen dem Anodenflowfield und dem Kathodenflowfield zweier benachbarter Zellen liegen. Dabei liegt dann die erste Seite des Kühlelementes im direktem Kontakt mit dem Anodenflowfield der ersten Zelle und die zweite Seite im direktem Kontakt mit dem Kathodenflowfield der zweiten Zelle.The from the two identical films existing cooling element can also without partitions directly between the anode flowfield and the cathode flowfield of two adjacent ones Cells are lying. In this case, then lies the first side of the cooling element in direct contact with the anode cell of the first cell and the second side in direct contact with the cathode flowfield of the second cell.

Das erfindungsgemäße Kühlelement ermöglicht die Verringerung des Übergangswiderstandes und gleichzeitig die Erhöhung der Stromleitfähigkeit aufgrund der größeren Kontaktfläche, da die Folie ausgleichend auf Bautoleranzen, im Vergleich zu herkömmliche Graphit- oder Graphit-Kompositplatten, wirkt.The Cooling element according to the invention allows the reduction of contact resistance and at the same time the increase the current conductivity due the larger contact area, there the film compensates for building tolerances, compared to conventional Graphite or graphite composite plates, acts.

Mit dem erfindungsgemäßen Kühlelement lassen sich die Material- und Produktionskosten eines Brennstoffzellenstapels erheblich verringern, da die Herstellung und Bearbeitung der Folien des Kühlelementes nur noch einen Bruchteil der Herstellung derzeitiger Kühlelemente kostet. So können z.B. mehrere Folien übereinander gelegt und in einem Arbeitsschritt gefertigt werden.With leave the cooling element according to the invention the material and production costs of a fuel cell stack significantly reduce the production and processing of the films of the cooling element only a fraction of the production of current cooling elements costs. So can e.g. several slides on top of each other be laid and manufactured in one step.

Die Vorteile des erfindungsgemäßen Kühlelementes für PEM-Brennstoffzellen ergeben sich aus der Verringerung der Baulänge eines PEM-Brennstoffzellen-Stacks, der Verbesserung der Stromleitfähigkeit zwischen den einzelnen PEM-Zellen und der Reduzierung der Kosten für einen PEM-Brennstoffzellen-Stacks.The Advantages of the cooling element according to the invention for PEM fuel cells result from the reduction in the length of a PEM fuel cell stack, the improvement of the current conductivity between the individual PEM cells and the reduction of costs for one PEM fuel cell stacks.

1 zeigt eine Explosionszeichnung. Die beiden Folien werden miteinander verklebt. Die Trennwände grenzen die Folie nach beiden Seiten hin ab. 1 shows an exploded view. The two films are glued together. The dividing walls delimit the film on both sides.

2 zeigt die beiden verklebten Folien, die eine durchgängige Mäander ergeben. 2 shows the two glued films, which result in a continuous meander.

1 Explosionszeichnung 1 exploded

2 verbundene (verklebte) Folien des Kühlelemntes 2 bonded (glued) films of Kühlelemntes

1.1.
Foliefoil
2.Second
Trennplatteseparating plate

Claims (5)

Kühlelement für eine PEM-Brennstoffzelle, gekennzeichnet durch zwei um 180° gedrehte Folien (1), die je auf einer Hälfte eine durchgehende Verteilungsstruktur aufweisen, so dass eine durchgehende, sich über die gesamte Zelle erstreckende, Verteilungsstruktur vorliegt.Cooling element for a PEM fuel cell, characterized by two films rotated by 180 ° ( 1 ), each having on one half a continuous distribution structure, so that there is a continuous, extending over the entire cell, distribution structure. Kühlelement nach Anspruch 1, bei der die Verteilungsstrukturfolien (1) miteinander verklebt sind.Cooling element according to claim 1, in which the distribution structure foils ( 1 ) are glued together. Kühlelement nach Anspruch 1 und 2, bei der zwei Trennplatten (2) an den Aussenseiten der verklebten Verteilungsstrukturfolien ein dichtes, separates Kühlelement ergeben.Cooling element according to Claims 1 and 2, in which two separating plates ( 2 ) give a dense, separate cooling element on the outside of the bonded distribution structure foils. Kühlelement nach Ansprüchen 1 – 3, wobei die Trennplatten (2) durch benachbarte Anoden- und Kathodenflowfields ersetzt werden und somit ein integriertes Kühlelement darstellt.Cooling element according to claims 1 - 3, wherein the separating plates ( 2 ) are replaced by adjacent anode and cathode flowfields and thus constitute an integrated cooling element. Kühlelement nach Ansprüchen 1 – 4, wobei die Verteilungsstruktur einen Zu- und Abflußkanal enthält.cooling element according to claims 1 - 4, wherein the distribution structure includes an inflow and outflow channel.
DE202004016991U 2004-11-04 2004-11-04 Cooling element for proton exchange membrane fuel cell has two films rotated through 180 degrees, each with continuous distribution structures on half so continuous distribution structure extending over entire cell exists Expired - Lifetime DE202004016991U1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006003206A1 (en) * 2006-01-24 2007-03-29 Forschungszentrum Jülich GmbH Flow distribution structure for fuel cell end plate, is formed by two or more adjacent plates including flow channel which meanders and has unequal branches
DE102008009377A1 (en) * 2008-02-14 2009-08-20 Behr Gmbh & Co. Kg Bipolar plate for use in fuel cell i.e. hydrogen fuel cell, has channel structure for channelizing reaction reactants and/or reaction products of fuel cell, and channel of channel structure in bipolar plate burned

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006003206A1 (en) * 2006-01-24 2007-03-29 Forschungszentrum Jülich GmbH Flow distribution structure for fuel cell end plate, is formed by two or more adjacent plates including flow channel which meanders and has unequal branches
DE102008009377A1 (en) * 2008-02-14 2009-08-20 Behr Gmbh & Co. Kg Bipolar plate for use in fuel cell i.e. hydrogen fuel cell, has channel structure for channelizing reaction reactants and/or reaction products of fuel cell, and channel of channel structure in bipolar plate burned

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