• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In order to improve the sealing between an elastomeric end frame (20) and the adjacent stack frame (3) of a cell stack (4) of a redox flow battery, it is provided that on the end frame (20) on the side of the recess (22) for receiving a pantograph (21 ) is formed on a first end face (24) of the end frame (20) along the circumference of the end frame (20) extending, circumferentially closed, from the first end face (24) of the end frame (20) rising first sealing element (25) is formed.
    公开号:AT513834A4
    申请号:T50136/2013
    申请日:2013-03-01
    公开日:2014-08-15
    发明作者:Herbert Ing Bucsich；Martin Dipl Ing Fh Harrer；Peter Ing Pokorny；Markus Dr Trampert；Adam Dr Whitehead
    申请人:Cellstrom Gmbh；
    IPC主号:
    专利说明:

    FW-3525 AT
    Elastomer end frame of a redox flow battery
    The present invention relates to an elastomeric end frame of a redox flow battery having a central first recess for receiving a current collector and a radially outer frame having a first end face surrounding the central recess and a cell stack having such an end frame.
    Redox flow batteries are known to consist of cells that are traversed by electrically different charged electrolytes. The cells comprise two juxtaposed frames, in each of which an electrode is arranged, which are separated by a semipermeable membrane, typically an ion-exchange membrane. Two individual cells of the redox flow battery are arranged in a bipolar plate. However, in the end frames at the axial ends of the redox flow battery there is no electrode as in the cells, but a metallic current collector connected to an outgoing electrical connection of the redox flow battery. The individual frames of the redox flow-through battery must be sealed against each other to prevent electrolyte from leaking to the outside (external sealing) and to prevent the differently charged electrolytes from mixing (internal sealing), resulting in a loss of efficiency would mean. However, leaks in the area of the metallic current collector are problematic, since an electrolyte would inevitably cause corrosion at the current collector, which after a certain time would entail the total failure of the redox flow battery. Contact between the electrolyte and the metallic current collector should therefore be prevented.
    In redox flow batteries, two types of frames are used, namely, frames made of elastic plastics (elastomers) and non-elastic plastics, e.g. PVC, PP, PE, PTFE, epoxy resin, etc. Non-elastic plastics, typically thermo-plastic plastics, are stiff and can only be molded within a certain temperature range. Elastomers are dimensionally stable, but elastically deformable plastics, that is, an elastomer returns to its original shape after deformation.
    For sealing between rigid frames made of non-elastic plastics are usually sealing element, such. O-rings are used, which are arranged between the rigid frame an-30 and which seal by compressing the frames. The sealing elements are usually arranged in grooves on the end faces of the frame. Examples of this can be found in EP 1 411 576 A1 or WO 2004/079849 A1. The problem with this is that the rigid frames can be mechanically damaged relatively easily, e.g. through scratches on the surface. It has been shown that even small scratches range from -35 to permanently affect the sealing effect. Such seals are also 2/131
    FW-3525 AT sensitive to foreign bodies (hair, fibers, etc.) on the frame, which in conjunction with the sealing elements can again lead to leaks. In addition, the assembly of a redox flow battery is complicated by the large number of necessary sealing elements that can easily slip and pinch.
    Likewise, frames made of non-elastic plastics have already become known, which have formed on one end circumferential, raised ribs, which engage positively for sealing in grooves of the adjacent end face. Such frames are e.g. from US 4,640,876 A or US 6,086,643 A known. Also such frames are regarding the sealing effect very susceptible to the smallest damage to the surfaces. However, another problem of such frames are the manufacturing tolerances in the production, usually by injection molding of the frame. In this case, manufacturing tolerances of +/- 1% are common. However, this can easily lead to alignment errors between ribs and associated grooves, especially if multiple ribs are provided, which in turn can lead to leakage between the frame.
    In elastomeric stack frame with molded raised sealing elements, such as sealing ribs, it took two different running stack frame to prevent that in the assembled state sealing element is applied to sealing element, which in turn would bring problems with the exact alignment of the sealing elements with it. For adjacent sealing elements by deforming the sealing elements during assembly would also have the problem, possibly crossing sealing elements. In addition, one would also deal with elastic stack frame problems with foreign bodies (hair, fibers, etc.) on the sealing surfaces or small damage (scratches). Therefore, you would have to examine the stack frame very carefully for damage or foreign bodies during assembly, which would significantly increase the assembly effort. All of these problems, however, would again lead to a higher susceptibility to leaking cell stacks. In addition, this would also increase the complexity of assembling a redox flow battery, as more different parts are needed, which ultimately increases the error rate of assembly. For these reasons, no elastomeric frame with molded, raised sealing elements are used per se.
    For elastomeric frames, for these reasons, the properties of the elastomeric material are exploited to make a seal by pressing the flat faces of the stacked stacking frames together and thereby sealing between the stacking frames. Such stack frames are e.g. from AT 501 902 A1 and AT 501 903 AI become known. The advantage here is that the seal is effected by the abutting end faces themselves and thus no further sealing elements or uplifting ribs are needed. In addition, such a 3/132 '
    FW-3525 AT elastomeric stack frame with sealing faces less sensitive to damage to the surface, However, make the manufacturing tolerances in the production of the frame difficulties. Between two stack frames must be sealed to the electrode plate, for the internal tightness, and to the adjacent stack frame, for the external tightness of the redox flow battery. Due to the manufacturing tolerances but can not be securely sealed at the same time both sealing surfaces. Due to the dimensions of the stack frame, however, the internal or the external sealing effect can be emphasized by setting more contact pressure between the electrode plate and stack frame or between the two stack frames by the dimensions of the stack frame. In general, the external tightness is preferred because internally a small leakage between stack frame and electrode plate is not a big problem. However, this is not possible between the stack frame and the end frame of the redox flow battery, since such internal leakage of electrolyte fluid would destroy the metallic current collector in the end frame due to corrosion.
    It is therefore an object of the subject invention to provide a seal between the end frame and adjacent frame of a cell stack of a redox flow battery that seals securely both internally and externally.
    This object is achieved by integrally formed on the side of the recess for receiving a current collector on the first end face along the circumference of the end frame extending, circumferentially closed, rising from the first end face of the frame first sealing element. For the end frame so the disadvantages of the greater effort in the assembly (caused by the need for an accurate inspection of the end frame of surface damage or foreign body) accepted, as created by the sealing element a seal that reduces the probability that electrolyte fluid comes into contact with the pantograph. To the outside, the seal is as usual through the abutting faces of elastic end frame and stack frame.
    If a circumferential elevation with a second end face is provided on the end frame on the radially outer edge and on the second end face is formed along the circumference of the end frame, circumferentially closed, rising from the second end face second sealing element, the external sealing effect is still be additionally increased. In addition, the sealing effect is no longer or only insignificantly influenced by manufacturing tolerances of the end frame or stack frame.
    By providing a plurality of sealing elements on the first end face or on the second end face, the sealing effect can be further improved. 4/1
    FW-3525 AT
    The subject invention will be explained in more detail below with reference to Figures 1 to 6, which show by way of example, schematically and not by way of limitation advantageous embodiments of the invention. It shows
    FIG. 1 shows a redox flow battery with a cell stack, FIG. 2 shows a section through the cell stack,
    3 and 4 detail views of the end frame and the adjacent stack frame,
    5 shows a perspective view of an end frame according to the invention and FIG. 6 shows possible cross sections of the sealing elements on the end frame.
    With reference to Figs. 1 and 2, the structure of a redox flow battery 1 will be explained. A cell stack 4 of a redox flow battery 1 comprises a plurality of cells 2, which in turn are each formed from two stack frames 3. A stack frame 3 is made of an elastomer, e.g. a polyolefinic thermoplastic elastomer (TPE or TPO), e.g. Santoprene®, or a thermoplastic vulcanate (TPV), manufactured, in particular in an injection molding process. The frame material has e.g. a hardness in the range of 40-15 95 Shore A, preferably 60-75 Shore A, on. Between each of two stack frames 3 of a cell 2 is disposed a semipermeable membrane 7, typically an ion exchange membrane (either cation or anion exchange membrane, e.g., Nation®). Between two adjacent cells 2 is electrode plate 5, e.g. a bipolar plate, wherein the electrode plate 5, as shown here, can be inserted into depressions in the stack frame 3. The stack frames 3 have central, continuous recesses in each of which electrodes 6, e.g. Mats made of carbon fibers, are arranged. Via holes 8, 9 in the stack frame 3 electrically differently charged electrolyte liquids are pumped through the cells 2, wherein the electrodes 6 of each half cell of a cell 2 is by a different electrolyte liquid durehströmt. The electrolyte liquids can be supplied and removed from the outside via 25 electrolyte liquid connections 10 and are then distributed internally via a channel system. As a result, as is well known, electrochemical processes generate electric current or charge the redox flow battery 1, or more precisely, the electrolyte liquids.
    The stack between the stack frame 3 via the abutting Stirnflä-30 chen the stack frame 3. Since the stack frame 3 are made of an elastomer and thus elastic, the tightness between the stack frame 3 and 2 cells is effected at a sufficient pressure.
    The cell stack 4 is placed between two rigid end plates 11 and tensioned by means such as e.g. durchreichende bolt 12, which are clamped by means of nuts 13, washers 15 and springs 14 35, compressed. At the end plates 11 may further an electrical
    FW-3525 AT
    Terminal 16 may be provided, via which the redox flow battery 1 can be connected to an external circuit. Furthermore, 11 terminals 10 are provided for the supply and discharge of the electrolyte liquid at the end plates. The two end plates 11 are here further arranged between two pressure plates 17, which are pressed together by the clamping means. Of course, any other suitable clamping means can be used. In order to prevent setting of the elastic stack frame 3 by the contact pressure, a stop or spacers 18 may be provided between the end plates 11. Of course, only a single plate may be used instead of the end plate 11 and the pressure plate 17.
    The cell stack 4 is closed at the two axial ends by a respective end frame 20 which bears against the end plate 11. In the end frame 20, e.g. in a recess on an end face of the end frame 20, a metallic current collector 21 is arranged, which is connected to an electrical connection 16. The current collector 21 is e.g. made of copper or aluminum, possibly with an outer coating with an electrically conductive material. The coating is e.g. Zn, Sn, Ni, Pb, Sb, Cd, Cr, C, In, or an alloy thereof. Likewise, inorganic compounds, e.g. Oxides, hydroxides, carbides, phosphides, sulphides, borides, etc., or electrically conductive polymers as a coating conceivable. Likewise, intermediate layers, e.g. made of Ni, between the coating and the base material possible. A current collector 21 could e.g. be made of 200pm aluminum with an intermediate layer of 5pm Ni and an outer coating of 10-100pm Sn. The end frame 20 will be described in more detail below with reference to FIG.
    The end frame 20 has a first central recess 22, in which the current collector 21 is arranged. Around the central first recess 22, the end frame 20 forms a radially outer frame 23 with a first end face 24 on the side of the first recess 22, which faces the adjacent stack frame 3. At the first end face 24 of the frame 23 and the end frame 20, a first sealing element 25 is formed, which extends along the circumference of the end frame 20, is closed in the circumferential direction and rises from the first end face 24. As used herein, "molded" means that the sealing element 25 is an integral part of the end frame 20 and co-formed in the molding process (e.g., injection molding) of the end frame 20. The sealing element 25 is thus preferably made of the same material as the end frame 20. In the embodiment shown, two such sealing elements 25 are arranged side by side. This first sealing element 25 cooperates sealingly in the stacked cell stack 4 with the electrode plate 5 of the adjacent cell 2 by the acting contact pressure. By the contact pressure, the sealing element 25 is elastically deformed, thus forming an effective seal between 6/135 '
    FW-3525 AT
    Electrode plate 5 and end frame 20, which prevents internal leakage and thus prevents electrolyte liquid comes into contact with the current collector 21. The first end surface 24 may further sealingly cooperate with the opposite end surface 26 of the adjacent stack frame 3 to also provide an external seal which prevents outward penetration of electrolyte liquid from the cell stack 4.
    Another advantageous embodiment of the seal between the end frame 20 and adjacent stack frame 3 is described with reference to Figs. 4 and 5 described. Here, on the side of the first recess 22 at the outer edge of the end frame 20 and the frame 23, a circumferential around the circumference of the end frame 20 elevation 27 is provided with a two-ten th end face 28. As a result, the end frame 20 is provided with a central first
    Recess 22 for receiving the current collector 21 and radially outside the first recess with a second recess 29 with the end face 24 for receiving the electrode plate 5 of the adjacent cell 2 executed. On the second end face 28 of the end frame 20, a second sealing element 30 is formed, which extends along the circumference of the end frame 15 20, is closed in the circumferential direction and rises from the second end face 28. In the embodiment shown, two such sealing elements 30 are arranged side by side. This second sealing element 30 acts in the assembled cell stack 4 by the acting contact pressure with the opposite end face 26 of the adjacent stack frame 3 sealingly together. By the contact pressure, the second Dichtele-20 ment 30 elastically deformed, thus forming an effective seal between the end frame 20 and adjacent stack frame 3, which prevents external leakage and thus a Nachaußendringen of electrolyte liquid from the cell stack 4.
    Likewise, around the bores 8, 9 such sealing elements 31 may be provided on the first end face 24 or second end face 28 in order to improve the seal, as shown in FIG.
    FIGS. 6a to 6e show conceivable cross-sectional shapes of the sealing elements 25, 30, 31. The sealing elements 25, 30, 31 may e.g. 6a), dome-shaped (FIG. 6b), semicircular or in the form of a circle segment (FIG. 6c), in the form of a flattened curve or a polygonal line (FIG. 6d), rectangular (FIG. In this case, a sealing element is provided with a width w in the range of 0.1 to 10 mm and with a height h in the range of 5 to 500 pm. If a plurality of sealing elements 25, 30, 31 are arranged side by side, the distance s between them is preferably in the range of 0.5 to 30 mm. 7 / if
    权利要求:
    Claims (5)
    [1]
    FW-3525 AT Claims 1. Elastomeric end frame of a redox flow battery with a central first recess (22) for receiving a current collector (21) and a radially outer Rah-5 men (23) having a first end face (24), the central Recess (22) surrounds, characterized in that on the side of the recess (22) on the first end face (24) extending along the circumference of the end frame (20), circumferentially closed, from the first end face (24) of Frame (23) elevating first sealing element (25) is integrally formed. io
    [2]
    2. Elastomeric end frame according to 1, characterized in that on the end frame (20) on the radially outer edge a peripheral elevation (27) with a second end face (28) is provided and on the second end face (28) along the circumference of the end frame (2o) extending, circumferentially closed, from the second end face (28) elevating second sealing element (30) is integrally formed.
    [3]
    3. elastomeric end frame according to claim 1 or 2, characterized in that on the first end face (24) or on the second end face (28) a plurality of sealing elements (25, 30) are integrally formed.
    [4]
    4. cell stack of a redox flow battery with a plurality of adjacent cells (2) from each two adjacent stack frame (3), wherein adjacent cells (3) 20 by electrode plates (5) are separated from each other, and with an end frame (20) one of claims 1 to 3, characterized in that the end frame (20) at the axial end of the cell stack (4) adjacent to the adjacent cell (2) is arranged, wherein the current collector (21) in the end frame (20) and the first sealing element (25) on the electrode plate (5) of the adjacent cell (2) and the first end face (24) of the end plate 25 (20) on the facing end face (26) of the adjacent stack frame (3).
    [5]
    5. cell stack according to claim 4, characterized in that the second sealing element (30) against the zugwandten end face (26) of the adjacent stack frame (3). 8/137 '
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    同族专利:
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    US20160006046A1|2016-01-07|
    CA2903284A1|2014-09-04|
    引用文献:
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    US20080309027A1|2004-08-02|2008-12-18|Pascal Rogeon|Static Seal|
    WO2006111704A1|2005-04-16|2006-10-26|Re-Fuel Technology Limited|Electrochemical cell stack with frame elements|
    US20120282501A1|2010-09-08|2012-11-08|Primus Power Corporation|Metal Electrode Assembly for Flow Batteries|
    JP4530122B2|2001-03-09|2010-08-25|Ｎｏｋ株式会社|gasket|
    JP3682244B2|2001-06-12|2005-08-10|住友電気工業株式会社|Cell frame for redox flow battery and redox flow battery|
    WO2008004987A1|2006-07-05|2008-01-10|Agency For Science, Technology And Research|Method, device and computer program for classifying a received signal|
    CA2758869C|2009-04-15|2013-02-05|Toyota Jidosha Kabushiki Kaisha|Fuel cell system|
    JP5617268B2|2009-05-19|2014-11-05|Nok株式会社|Fuel cell sealing structure|
    AT510723B1|2010-12-21|2012-06-15|Cellstrom Gmbh|FRAME OF A CELL OF A REDOX FLOW BATTERY|AT518279B1|2016-02-24|2017-09-15|Gildemeister Energy Storage Gmbh|Spacer for cell stack|
    JP6677045B2|2016-03-29|2020-04-08|住友電気工業株式会社|Frame for redox flow battery, redox flow battery, and cell stack|
    US11031619B2|2017-05-25|2021-06-08|The Curators Of The University Of Missouri|Cell for flow battery|
    GB2570892A|2018-02-07|2019-08-14|Redt Ltd Dublin Ireland|Electrochemical cell stack|
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    WO2021231152A1|2020-05-15|2021-11-18|Ess Tech, Inc.|Redox flow battery and battery system|
    法律状态:
    2016-11-15| PC| Change of the owner|Owner name: GILDEMEISTER ENERGY STORAGE GMBH, AT Effective date: 20161005 |
    2018-12-15| PC| Change of the owner|Owner name: ENEROX GMBH, AT Effective date: 20181018 |
    2020-11-15| MM01| Lapse because of not paying annual fees|Effective date: 20200301 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50136/2013A|AT513834B1|2013-03-01|2013-03-01|Elastomer end frame of a redox flow battery|ATA50136/2013A| AT513834B1|2013-03-01|2013-03-01|Elastomer end frame of a redox flow battery|
    PCT/EP2014/053429| WO2014131702A1|2013-03-01|2014-02-21|Elastomeric end frame of a redox flow battery|
    CA2903284A| CA2903284A1|2013-03-01|2014-02-21|Elastomeric end frame of a redox flow battery|
    EP14706298.8A| EP2962352A1|2013-03-01|2014-02-21|Elastomeric end frame of a redox flow battery|
    US14/771,391| US20160006046A1|2013-03-01|2014-02-21|Elastomeric End Frame of a Redox Flow Battery|
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