• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    In order to hold gaskets (10) in place in a fuel cell (1), projections (11) are provided which during assembly are pressed into the surface of the flat gasket (10) and maintain sealing conditions despite deformation of the gasket (10) due to thermal cycles.
    公开号:DK201800024U1
    申请号:DK201800024U
    申请日:2018-03-12
    公开日:2018-03-23
    发明作者:Mads Bang；Anders Risum Korsgaard
    申请人:Serenergy As；
    IPC主号:
    专利说明:

    < 1 θ> DENMARK < 1 °> DK 2018 00024 U1
    < 12 > USE MODEL APPLICATION
    Patent and
    Commonly available
    Trademark Office (51) Int.CI .: H 01M 8/0271 (2016.01) (21) Application number: BA 2018 00024 (22) Filing date: 2018-03-12 (24) Running day: 2016-05-31 (41) Aim. available: 2018-03-12 (67) Reg. is a branch from DK pat. ans. no: PA 2016 70386 (71) Applicant: SERENERGY A / S, Lyngvej 8, 9000 Aalborg, Denmark (72) Producer: Mads Bang, Hanesvinget 1,9520 Skørping, Denmark Anders Risum Korsgaard, Heilskovsgade 36, 9000 Aalborg, Denmark (74 ) Plenipotentiary: Patrade A / S, Ceresbyen 75, 8000 Aarhus C, Denmark (54) Title: Fuel cell device for securing gaskets in the fuel cell (56) Relevant publications:
    (57) Summary:
    In order to hold gaskets (10) in place in a fuel cell (1), projections (11) are provided which during assembly are pressed into the surface of the flat gasket (10) and maintain sealing conditions despite deformation of the gasket (10) due to thermal cycles.
    To be continued ...

    Η
    DK 2018 00024 U1 i
    Fuel cell cleaning to secure gaskets in fuel cell
    FIELD OF THE INVENTION
    The present invention relates to fuel cell gaskets and a device for ensuring that the gaskets remain sealed despite thermal cycles.
    BACKGROUND OF THE INVENTION
    In fuel cell stacks, polymer gaskets are used for sealing between the anode and cathode plates, for example between bipolar plates.
    1.0
    US7Ö81316 by Rock discloses a fuel cell stack wherein a bipolar plate assembly is sandwiched between two gaskets covering the rim of the bipolar plate assembly. The gaskets include openings near opposite edges to ducts necessary for transporting fuel gas and air along the stack. The bipolar plate assembly is made
    1.5 of metal plates which are connected so that water channels are provided between the plates for cooling.
    Placement of such gaskets during production must be performed accurately to ensure proper sealing; and to ensure good long-term sealing, the gaskets must be kept at this location. Good long-term sealing is a challenge, as repeated thermal cycles of the fuel cell when turned on and off result in small extensions and contractions of the gaskets relative to the bipolar plates as they are made of another material with a different thermal expansion coefficient. Repeating such an expansion and contraction hundreds or even thousands of times leads to one. considerable deformation and deformation of the gaskets, which ultimately leads to leakage.
    Patent applications US2Ö05 / Ö7940Ö by Sugiura and US2002 / 0122970 by Inoue disclose molding of gaskets on bipolar devices. However, this is a complicated and expensive solution, although it can provide good long-term sealing. Patent US8865362Cross This fax was sent with GF! FaxMake a fax server. For more information, visit: hops, // www.gfi.corn
    DK 2018 00024 U1 farm, handed over to Serenergy A / S, describes a groove in which a gasket is placed. to attach to the gasket · International patent application WO2Ö13 / Ö69888 in Korean describes a fuel sealing device in which gaskets are provided with bevelled protrusions Sang's edge areas, which fit into respective grooves.
    Although the various methods aim to give the fuel cell stacks a long life, long-term stability of gaskets is still a problem in many cases, especially when the fuel cells are heated and cooled in cycles. We would like to provide further improvements.
    DESCRIPTION / SUMMARY OF THE INVENTION
    It is therefore the object of the invention to provide an improvement in the art. In particular, it is an object to provide a fuel seal device with improved long-term stability of gaskets. This object is achieved by a fuel cell device as described below.
    The fuel cell, for example as part of a fuel cell stack, comprises an anode plate and a cathode path and a proton exchange membrane in a region therebetween.
    For example, the anode plate and cathode pad are integrated as a bipolar plate in a fuel cell stack. Alternatively, the anode plate and the bipolar plate are combined in a bipolar plate bedding set, for example attached to each other back to back with a sealed coolant flow feature therebetween. Examples of such cooling flow fields are channels, for example meandered channels. In the bipolar pSad arrangement, the anode plate has an anode side toward the membrane and the cathode has a cathode side towards the membrane. Both the anode plate and the cathode plate have an opposite cooling side facing. each other and includes the cooling flow field.
    The package has two opposite, flat, deformable, for example elastic, surfaces provided abutting against the anode plate and the cathode plate to seal the gap in which the membrane is provided. In particular, the package has one. first flat surface
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    GB 2018 00024 U1 j abuts against the anode pad along an edge region of the anode plate, and an opposite, second flat surface abuts against the cathode plate along an edge region of the cathode plate.
    To provide an improved seal, the anode plate or cathode plate or both protrusions provided as imaging profiles comprise along the edge regions. These projections extend sealingly into the deformable surface of the gasket; For example, the membrane is surrounded by the edge regions of the anode plate and the cathode plate, and the projections extend along the edge regions and sealingly surround the membrane as they interact with the gasket.
    During the preparation of the fuel cell, the membrane is provided in the space between the anode plate and the cathode plate. The gasket is disposed with the edge region of the anode plate and the opposite edge region of the cathode plate, and the anode plate and cathode plate are compressed, thereby pressing the projections into the flat deformable surface of the gasket. The flat surface of the gasket is thereby deformed as the projections create recesses in the gasket surface during assembly.
    The projections ensure a long-term sealing wrap of the gasket as it allows the gasket to expand and contract and allow small ones. movements of it without loss of the sealing properties. Ϊ in case of movement, expansion or contraction of the seal 1 in relation to the projections, only another part of the gasket is compressed and deformed, for example elastically deformed while the sealing effect is maintained. In addition, this principle also has the advantage that a precise positioning of the gasket relative to the anode plate and the cathode plate are not strictly necessary as the protrusion creates recesses in the deformable flat surface of the gasket, regardless of which portion of the gasket is pressurized between the anode and cathode plates.
    in comparison with systems in which the package comprises projections which are accommodated in a portion of the bipolar plate, the inverse principle of the invention has been found to be far simpler and more long-term reliable because it does not involve the risk that a projection is not longer fits into a groove.
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    DK 2018 00024 U1
    The projections on the anode plate are preferably of the same first height. Similarly, the projections on the cathode plate have the same second height, however, the seams do not have to be identical to the first height, although this is typically the case. For example, the projections have a height H in the range of 0.02-0.1 mm.
    For example, the gasket comprises two abutting halves abutting one half abutting an edge region of the anode plate and the other half requesting an edge region of the cathode plate. This embodiment is useful in the case where the diaphragm is provided. for example, a frame extending around the diaphragm where the frame is shaped like a sheet. The sheet can then be clamped between the two halves of the package, thereby sealing the anode space on one side of the membrane to the cathode space on the opposite side of the membrane. In this way, the membrane, anode space and cathode space are also sealed to the surroundings.
    Advantageously, the edge section of the anode plate as well as the edge region of the cathode plate include such projections. During assembly of the fuel cell, the protrusions of the anode plate are pressed into the deformable flat surface on one side of the gasket and the protrusions of the cathode plate are pressed into the deformable flat surface on the opposite side of the gasket. Thereby, the space of the membrane is sealed between the anode plate and the cathode plate,
    In some embodiments, the protuberances have a high H. increase is provided as a double line profile with a distance D between a first line profile and a second line profile. In some embodiments, the ratio D; H is in the range of 5 to 40, for example 10 to 40. Prior to example, the distance D is 1.5-2 mm.
    As an option, as a special measure against leaks, ribs are provided at several locations along the projections, where the ribs connect one line profile to the other line profile and optionally have the same height H or substantially the same height as the line profiles.
    In an example of dimensions, the flat surface of the gasket has a width W across the edge region towards the outer edge of the fuel cell, and this width W is
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    GB 2018 00024 U1 at least 3 times, for example at least 4 times, a thickness T of the gasket. The thickness T corresponds to the distance between the anode plate and the cathode pad after assembly. For example, the width W of the gasket is along its flat surface across the edge region of the anode plate or cathode plate or both in the range of 1-10 mm, optionally 2-4 mm. An example of packing thickness T is in the range of 0.5-1 mm, optionally 0.6-0.8 mm.
    Cases made of a deformable, for example, elastic polymer, so that the projections can deform the polymer to a safe deflection state. For example, the gasket is made of fluoropolymer. Examples are fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE) or perfluoroalkoxy polystyrene (PFA). For example, fluoropolymers entail lower production costs than rubber. They also imply a buoyant degree of long-term stability, even when made very thin as illustrated in the drawings. Silicone is typically less useful in PEM fuel cells as it degrades under acidic conditions.
    An example of. application of the principles described above is in connection with high temperature proton exchange membrane fuel cells, also called high temperature proton exchange membrane (HTPEM) fuel cells. The operating temperature of HTPEM bi-fuel cells is: the range of 120 to 200 degrees Celsius »for example in the range of 1.60 to 170 degrees Celsius. Repeated thermal cycles between this operating temperature and the ambient temperature, to which the fuel cells are cooled when not in use, entail a significant temperature variation that challenges the packings in fuel cells.
    The principles as described above and explained in more detail below imply a substantial improvement in fuel cell sealing during long term operation, especially for H IPfcM fuel cells.
    For the anode plate and cathode pad, the bipolar plate or the bipolar composite plate, various materials and production methods are possible. For example, metal sheets, such as steel sheets, are pressed to the correct shape with the projections by a corresponding press. Alternatively, the sheets are made by milling or molding.
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    DK 2018 00024 U1
    Examples of materials in the latter case are graphite, rubber-containing polymers, ceramics, metals and metal alloys.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The invention will be explained in more detail with reference to the drawing, in which Fig. 1 illustrates an example of a fuel cell arrangement;
    FIG. 2 illustrates double projections on an edge region of a cathode plate;
    FIG. 3 illustrates a fuel cell in a) an exploded overview and b) an enlarged section.
    DETAILED DESCRIPTION / PREFERRED EMBODIMENT
    FIG. 1 illustrates an example of a PEM fuel cell stack t (PEM ::: proton exchange membrane proton exchange membrane). The device 1 comprises an anode plate 2 with fuel channels 3 for controlling the flow of hydrogen fuel on a first side of a proton exchange membrane 4 and a cathode plate 5 with oxygen channels 6 for controlling the air flow on a second side of the proton exchange membrane 4. The anode plate 2 and the cathode plate 5 oriented back to back with a bunk flow field comprising channels 7 in between. The anode plate 2 in combination with the cathode plate 5 forms a bipolar plate composition 8 with integral cooling channels 7. Between two such bipolar plate compositions 8, proton from the exchange membrane 4 is provided. The diaphragm 4 is in contact with the two bipolar plate compositions 8 and is connected to a gasket 10 by means of a connecting sheet 9. 4 and is in contact with. the two bipolar pad devices 8. Thus, the gasket seals, the volume on the anode side of the membrane 4 and the volume on the cathode side of the membrane 4. It also seals the bipolar plate structure 8 against the surroundings.
    As indicated in FIG. 1, but most clearly seen in FIG. 2, the anode plate 2 and correspondingly the cathode plate 5 are provided with projections 11 at their edge regions 12. The projections extend as line profiles along the edge region 12 and surround the membrane 4 to
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    DK 2018 00024 U1 complete seal. As seen in FIG. i, the gasket 10 does not comprise protrusions or grooves along the edge region 12 of the bipolar plate composition 8. However, indentations 1.3 in the gasket 1.0 are formed by the protrusions 1.1, due to the protrusions 11 which create the indentations 13 in the gaskets 10 during assembly of the fuel cell stack. high degree of sealing, which is maintained even Ϊ in case the seals 10 apply to the bipolar plate assembly 8, even if the seals 10 are deformed during prolonged use.
    the example of FIG. I and FIG. 2, the projections 11 are provided as double-line profiles 1a, 1bb across the membrane 4. However, a single-line profile will also work in principle: However, it has been found that a double-line process works better. As shown in FIG. 2, the distance D between the projections in Ia, 1 Ih is much greater than the height H. of the projections. For example, the ratio D: H between the distance D and the height H is in the range 5-30, such as '10-30.
    In some examples of embodiments, the following dimensions apply. The distance D is in the range 1.5-2 mm and the height H in the range 0.02-0.1 mm. The gasket 10 has a thickness T of 0.5-1 mm. For example, the gasket is made of two halves 10a, barrels, each having a thickness of 0.25-0.5 mm, optionally 0.3-0.4 mm, and clamping the thin connecting sheet 9 between the two halves 10a, 10b, the width W of the gasket 10 along its flat surface, as indicated in FIG. 1 is in the range 1-1.0 mm, optionally 2-4 mm,
    FIG. 3a is an outline drawing of two bipolar plate assemblies 8 sandwiched between two seals 10. FIG. 3b is an enlarged end portion of FIG. 3A. The seals 10 as well as the bipolar plate assemblies 8 comprise a plurality of inlet and outlet openings 14, 15 for cooling water, fuel gas and air. In the drawing shown, a gasket 10 is missing in position 16 between the two bipolar plate compositions 8, which is due to better illustration of the compositions 8. As seen in FIG. 3 b, is a portion of the surface of the bipolar plate compositions 8 provided with buds 1 in the region shown towards the ends of the bipolar plate compositions 8, whereas channels towards the center of the bipolar plate compositions 8 are provided as illustrated in FIG. I, which is a cross section near the center of the device.
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    DK 2018 00024 U1
    As shown, the two line profiles 1a, 1b are connected to ribs 18 extending from one line profile Ha to the other line profile 11b. These ribs 18 are provided at ten locations along the projections 11 as a further remedy for possible leaks.
    For example, the gasket is made of fluoropolymer, which, for example, induces far more production costs than rubber. The fiberglass stirrer also provides a high degree of elongation stability, even when rendered very thin as illustrated in the drawings. Silicone is less useful in FEM fuel cells as it degrades under acidic conditions.
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    DK 2018 00024 U1
    权利要求:
    Claims (10)
    [1]
    REQUIREMENTS
    A fuel cell device (1) comprising an anode plate (2) and a cathode plate (5), for example provided as bipolar plates, and a proton exchange membrane (4) at a space between the anode plate (2) and the cathode pad (5); wherein a gasket (10) having a flat deformable surface is provided between the anode plate (2) and the cathode plate (5), the gasket (10) sealing the gap; the gasket (10) having a first flat surface abutting with the anode plate (2) along an edge region (12) of the anode plate (2) and another opposing flat surface abutting the cathode pad (5) along one. edge region of the cathode path (5); wherein the anode plate (2) or cathode pad (5) or both comprise projections (II) provided as line peptophils along the edge regions (12), the projection sealingly extending into the deformable surface of the gasket (1.0).
    [2]
    A fuel cell (1) according to claim 1, wherein the edge regions (12) of the anode plate (2) and the cathode path (S) surround the membrane (4), and the projections (II) extend along the edge regions (12) and surround the membrane. sealing show.
    [3]
    A fuel sealing device according to claim 1 or 2, wherein the gasket (10) comprises two halves (10a, 10b) abutting one another, one half (1.0a) being disposed in abutment with an edge region (12) of the anode plate (2). and the other half (10b) t having an edge region of the cathode path (5); wherein the membrane (4) is provided on a frame, the frame extending around the membrane (4) and formed as a sheet (9); wherein a portion of the sheet (9) is clamped between the two halves (10a, 10b) of the gasket (10), sealing the anode sleeve on one side of the membrane (4) against the cathode space on the opposite side of the membrane (4).
    [4]
    Fuel cell assembly according to any one of the preceding claims, wherein the projections have a height H increase are provided with a double line profile (1a, 1.1b) with a distance D between a first line profile (1a) and a second line profile (1). Ib), where the ratio D: H is in the range of 5 to 40.
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    DK 2018 00024 U1 ιο
    [5]
    A fuel cell assembly according to any one of the preceding claims, wherein the projections are provided as a dip line profile (11a, 1 lb) with a distance D between a first line profile (11a) and a second back profile (1 lb), wherein ribs (18) is provided at several locations along the projections (11) as a means for leaks, the ribs connecting the first line profile (1a) with the second line profile (11b).
    [6]
    6, Fuel cell arrangement according to any one of the preceding claims, wherein the flat surface of the gasket (.10) across the edge region (12) has a width W which is at least 3 times the thickness T of the gasket (10), the thickness T corresponding to the distance between the anode plate (2) and the cathode plate (5) after assembly.
    [7]
    A board silicon silicon device according to any one of the preceding claims, wherein the protrusions (11) have a constant height H in the range of 0.02-0.1 mm; wherein the gasket (10) has a thickness T in the range 0.5-1 mm.
    [8]
    A fuel cell arrangement according to any one of the preceding claims, wherein the width W of the gasket (10) is in the range 1-10 mm along its flat surface over the edge area (12) of the anode plate (2) or the cathode plate (5) or both.
    [9]
    A fuel cell arrangement according to any one of the preceding claims, wherein the anode plate (2) comprises fuel channels (3) in a system with a first side of the proton 'exchange membrane (4) for controlling the flow of burning fuel on the first side of the ptoton exchange membrane (4). and wherein the cathode plate (5) comprises oxygen channels (6) in systems with a second side opposite to the first side of the proton exchange membrane (4) to control flow of air or oxygen. on the other side of the diaphragm (4),
    [10]
    A fuel cell arrangement according to any one of the preceding claims, wherein the ribbon seismic device is a high temperature piotone-resistant Tolyte membrane (HTPEM.) Fuel cell device and the gasket is made of finor polymer.
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    同族专利:
    公开号 | 公开日
    DK201800024Y3|2018-04-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2020099351A1|2018-11-12|2020-05-22|Fischer Eco Solutions Gmbh|Method for bonding two plates together for a fuel cell, especially gluing bipolar plates in a fuel cell|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DKBA201800024U|DK201800024Y3|2018-03-12|2018-03-12|Fuel cell device for securing gaskets in the fuel cell|DKBA201800024U| DK201800024Y3|2018-03-12|2018-03-12|Fuel cell device for securing gaskets in the fuel cell|
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