DE102008013038A1 - Seal for a fuel cell - Google Patents

Seal for a fuel cell

Info

Publication number
DE102008013038A1
DE102008013038A1 DE102008013038A DE102008013038A DE102008013038A1 DE 102008013038 A1 DE102008013038 A1 DE 102008013038A1 DE 102008013038 A DE102008013038 A DE 102008013038A DE 102008013038 A DE102008013038 A DE 102008013038A DE 102008013038 A1 DE102008013038 A1 DE 102008013038A1
Authority
DE
Germany
Prior art keywords
seal
recesses
membrane
characterized
page
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE102008013038A
Other languages
German (de)
Inventor
Stefan Dr. Geiss
Lars Gerding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Freudenberg Carl KG
Original Assignee
Freudenberg Carl KG
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 Freudenberg Carl KG filed Critical Freudenberg Carl KG
Priority to DE102008013038A priority Critical patent/DE102008013038A1/en
Publication of DE102008013038A1 publication Critical patent/DE102008013038A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/02Details
    • H01M8/0271Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/028Sealing means characterised by their material
    • H01M8/0284Organic resins; Organic polymers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/02Details
    • H01M8/0271Sealing or supporting means around electrodes, matrices or membranes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/02Details
    • H01M8/0271Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276Sealing means characterised by their form
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/10Fuel cells with solid electrolytes
    • H01M2008/1095Fuel cells with polymeric electrolytes

Abstract

A gasket (1) for a fuel cell, comprising a flat layer (3) with a first side (4) and a second side (5), wherein recesses (in the first side (4) and / or the second side (5) 6) are introduced or in the position (3) openings (7) are introduced.

Description

  • Technical area
  • The The invention relates to a gasket for a fuel cell, consisting of a flat position with a first and a second page.
  • State of the art
  • Fuel cells consist of a juxtaposition of individual cells. These form a so-called stack or cell stack, into which often additional components for cooling are integrated. A stack can consist of up to 500 individual cells. A cell is characterized by a layered structure, wherein a cell consists of an arrangement formed by two bipolar plates with gas distribution structure, two gas diffusion layers and a reaction layer in the form of a catalyzed membrane. Two gas diffusion layers each surround the reaction layer and form a membrane-electrode arrangement. To avoid leakage, the membrane-electrode assembly or the bipolar plate is equipped with a seal, as shown in WO 2003/100894 A2 is known. There are seals known loose, so are arranged without cohesive bond between the bipolar plates, abut both sides of the membrane and seal them. The seals are compressed when mounting the stack and displaced to the outside due to the incompressibility of the sealing material. At the contact surfaces to the membrane tensions arise which lead to the destruction of the membrane.
  • Presentation of the invention
  • Of the Invention is based on the object, a seal for to provide a membrane electrode assembly of a fuel cell, which allows a low-stress shoring.
  • These The object is achieved with the features of claim 1 and 2. In advantageous embodiments, the dependent claims Reference.
  • to Solution of the task are in the first page and / or the second side of the sheet-like sealing layer recesses introduced or in the gasket layer openings are introduced. In the recesses or breakthroughs can the material of the seal during compression be displaced. Thus, there is room in the interior of the seal available so that the displaced sealing material only a small way, the deformation forces fall during assembly and only very low voltages within the seal are generated. Due to the lower voltages on the contact surface with the membrane reduces the risk of damage the membrane considerably. Furthermore sinks through the recesses / openings the gasket effective area of the gasket, so that too the assembly / clamping force drops and therefore the membrane-electrode assembly safer with the seal according to the invention assemble is. The two sides of the seal are preferred just trained, but can also in addition be profiled.
  • The Recesses or perforations can be in multiple rows are arranged in the layers. By the arrangement of the recess or breakthroughs in several rows, on the one hand, the tension lowered particularly effective during pressing in this area and thereby preventing the cracking of the sealing material and on the other hand, there is a continuous sealing surface which ensures maximum tightness.
  • It At least three rows can be provided, wherein the Recesses or openings preferably offset in the rows are arranged to each other. This ensures that sufficient sealing material flat and sealing to the Bipolar plates and is applied to the membrane and no leakage occur can.
  • The Layer can be made of elastomeric material. It is the advantageous Effect of the embodiment according to the invention in particular given in the materials, which by itself on a high Stiction, since here the material at displacement not displaced due to the adhesion to the sealing surfaces can be and thus even at low compression high Tensions on the contact surfaces occur. As the material at the embodiment of the invention in open spaces can be displaced, which is arranged in the seal itself are the occurrence of high shear stresses safely avoided. Commonly used gasket materials for fuel cells are for example EPDM, PIB, FKM or silicone. These sealing materials are adapted to the requirements in a fuel cell but a high static friction coefficient. Therefore, the invention Embodiment of the seal particularly advantageous for these materials.
  • The associated with the inner circumference and the outer circumference of the layer Edge areas can be free of recesses or openings be.
  • To the one is the edge area due to the free edges in Regarding shear stress uncritical and the other will result an edge region in which the seal rests flat and so no impurities can penetrate into the sealing area.
  • In an inventive arrangement of the seal this is mounted adjacent to a membrane-electrode assembly. This includes a membrane that is double sided with a gas diffusion layer is covered. The membrane-electrode assembly is in turn between two bipolar plates arranged. The seal is as a separate seal formed and is arranged for mounting between the bipolar plates and seals the space between the bipolar plates after assembly, So the pressing, from. There are two seals provided, the each sealingly against a bipolar plate and the membrane. To stabilize the membrane, it is known that the membrane in the edge region to be provided with a protective layer. This can, for example, as Plastic film formed. The protective layer causes a mechanical Stabilization of the sensitive membrane. Since the inventive Gasket allows a low tension construction is the Membrane only subjected to low mechanical stresses and the protective layer can be omitted in advantageous embodiments.
  • Brief description of the drawing
  • Some Embodiments of the invention Seal will be explained in more detail with reference to FIGS. These show, in each case schematically:
  • 1 a membrane-electrode assembly with two seals according to the invention prior to assembly;
  • 2 a membrane-electrode assembly with two seals according to the invention after assembly;
  • 3 a seal in plan view;
  • 4 a seal with recesses;
  • 5 a seal with openings;
  • 6 a seal with recesses.
  • Embodiment of the invention
  • 1 shows an arrangement as part of a PEM fuel cell 14 with two bipolar plates 11 between which is a membrane-electrode assembly 2 located. The membrane electrode assembly 2 consists of a membrane 12 , on both sides with a gas diffusion layer 13 is covered. The membrane 12 protrudes circumferentially on the gas diffusion layers 13 out. Adjacent to the gas diffusion layers 13 is each a seal 1 intended. The seals 1 each cover a flat location 3 , in the breakthroughs 7 are introduced.
  • 2 shows the arrangement 14 according to 1 after assembly. After pressing the bipolar plates 11 and the interposed membrane-electrode assemblies 2 lie the seals 1 sealing on the membrane 12 and in each case a bipolar plate 11 at. Due to the breakthroughs 7 the material displacement of the sealing material was carried out in the direction of the openings 7 , so that only a small material displacement takes place in the direction of the outer circumference. As a result, the two contact surfaces of the seal 1 to the bipolar plate 11 and to the membrane 12 stress.
  • 3 shows a seal 1 for a fuel cell as described above. The seal 1 consists of a flat location 3 consisting of elastomeric material. The flat location 3 has a first page 4 and a second page 5 on, in the recesses 6 or in another embodiment breakthroughs 7 are introduced. The recesses 6 or breakthroughs 7 are in several rows 8th , here are three rows 8th , arranged, with the rows 8th the center of the situation are assigned and the the inner circumference 9 and the outer circumference 10 The location associated edge areas are free of recesses or openings. The recesses 6 or breakthroughs 7 are arranged in rows offset from each other, so that an optimal distribution of sealing material 6 and recesses or openings 7 results in and so a low-stress displacement of the sealing material in the region of the greatest displacement is possible.
  • 4 shows a seal 1 according to 3 , wherein in this embodiment recesses 6 are provided. The recesses 6 are arranged in rows with the recesses 6 the first page 4 and the second page 5 offset from one another.
  • 5 shows a seal 1 according to 3 , wherein in this embodiment openings 7 are provided.
  • 6 shows a seal according to 3 , wherein in this embodiment recesses 6 are provided. The recesses 6 are arranged in rows with the recesses 6 the first page 4 and the second page 5 are arranged one below the other.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • WO 2003/100894 A2 [0002]

Claims (8)

  1. Poetry ( 1 ) for a fuel cell, consisting of a flat layer ( 3 ) with a first page ( 4 ) and a second page ( 5 ), characterized in that in the first page ( 4 ) and / or the second page ( 5 ) Recesses ( 6 ) are introduced.
  2. Poetry ( 1 ) for a fuel cell, consisting of a flat layer ( 3 ), characterized in that 3 ) Breakthroughs ( 7 ) are introduced.
  3. Seal according to claim 1 or 2, characterized in that the recesses ( 6 ) or breakthroughs ( 7 ) in several rows ( 8th ) in a position ( 3 ) are arranged.
  4. Seal according to claim 3, characterized in that at least three rows ( 8th ) are provided.
  5. Seal according to claim 3 or 4, characterized in that the recesses ( 6 ) or breakthroughs ( 7 ) in the rows ( 8th ) are offset from one another.
  6. Seal according to one of claims 1 to 5, characterized in that the position ( 3 ) consists of elastomeric material.
  7. Seal according to one of claims 1 to 6, characterized in that the inner circumference ( 9 ) and the outer circumference ( 10 ) the situation ( 3 ) associated edge regions free of recesses ( 6 ) or breakthroughs ( 7 ) are.
  8. Arrangement ( 14 ) comprising two bipolar plates ( 11 ) between which a membrane electrode assembly ( 2 ) with a membrane ( 12 ) two gas diffusion layers ( 13 ) and at least one seal ( 1 ) are arranged according to one of the preceding claims.
DE102008013038A 2008-03-06 2008-03-06 Seal for a fuel cell Withdrawn DE102008013038A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102008013038A DE102008013038A1 (en) 2008-03-06 2008-03-06 Seal for a fuel cell

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008013038A DE102008013038A1 (en) 2008-03-06 2008-03-06 Seal for a fuel cell
PCT/EP2009/001477 WO2009109352A1 (en) 2008-03-06 2009-03-03 Seal for a fuel cell

Publications (1)

Publication Number Publication Date
DE102008013038A1 true DE102008013038A1 (en) 2009-09-10

Family

ID=40637159

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102008013038A Withdrawn DE102008013038A1 (en) 2008-03-06 2008-03-06 Seal for a fuel cell

Country Status (2)

Country Link
DE (1) DE102008013038A1 (en)
WO (1) WO2009109352A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017137292A1 (en) * 2016-02-10 2017-08-17 Volkswagen Ag Bipolar plate having asymmetrical sealing sections, and fuel cell stack having such a bipolar plate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5884713B2 (en) * 2012-11-30 2016-03-15 トヨタ自動車株式会社 Fuel cell and fuel cell stack

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100894A2 (en) 2002-05-17 2003-12-04 3M Innovative Properties Company Membrane electrode assembly with compression control gasket
DE102004028857A1 (en) * 2004-06-15 2006-01-12 Carl Freudenberg Kg Substrate with integrated seal

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6355371B1 (en) * 1999-08-27 2002-03-12 Plug Power Inc. Profiled fuel cell flow plate gasket
US6761991B2 (en) * 2001-10-16 2004-07-13 Dow Corning Corporation Seals for fuel cells and fuel cell stacks
US7087339B2 (en) * 2002-05-10 2006-08-08 3M Innovative Properties Company Fuel cell membrane electrode assembly with sealing surfaces
DE10250434A1 (en) * 2002-10-30 2004-05-13 Ab Skf Module for a fuel cell arrangement
US7070876B2 (en) * 2003-03-24 2006-07-04 Ballard Power Systems, Inc. Membrane electrode assembly with integrated seal
US20060210857A1 (en) * 2005-03-15 2006-09-21 David Frank Electrochemical cell arrangement with improved mea-coolant manifold isolation
CN101336493B (en) * 2006-02-09 2010-12-08 卡尔弗罗伊登柏格两合公司 Gas diffusion unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100894A2 (en) 2002-05-17 2003-12-04 3M Innovative Properties Company Membrane electrode assembly with compression control gasket
DE102004028857A1 (en) * 2004-06-15 2006-01-12 Carl Freudenberg Kg Substrate with integrated seal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017137292A1 (en) * 2016-02-10 2017-08-17 Volkswagen Ag Bipolar plate having asymmetrical sealing sections, and fuel cell stack having such a bipolar plate

Also Published As

Publication number Publication date
WO2009109352A1 (en) 2009-09-11

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20141001