EP3818197A1 - Dispositif électrochimique - Google Patents

Dispositif électrochimique

Info

Publication number
EP3818197A1
EP3818197A1 EP19737677.5A EP19737677A EP3818197A1 EP 3818197 A1 EP3818197 A1 EP 3818197A1 EP 19737677 A EP19737677 A EP 19737677A EP 3818197 A1 EP3818197 A1 EP 3818197A1
Authority
EP
European Patent Office
Prior art keywords
medium channel
bipolar plate
electrochemical device
flow field
medium
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.)
Pending
Application number
EP19737677.5A
Other languages
German (de)
English (en)
Inventor
Peter Stahl
Jürgen KRAFT
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.)
Ekpo Fuel Cell Technologies GmbH
Original Assignee
ElringKlinger AG
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 ElringKlinger AG filed Critical ElringKlinger AG
Publication of EP3818197A1 publication Critical patent/EP3818197A1/fr
Pending legal-status Critical Current

Links

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
    • H01M8/24—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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/02—Diaphragms; Spacing elements characterised by shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/70—Assemblies comprising two or more cells
    • C25B9/73—Assemblies comprising two or more cells of the filter-press type
    • C25B9/77—Assemblies comprising two or more cells of the filter-press type having diaphragms
    • 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • 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
    • H01M8/0276—Sealing means characterised by their form
    • 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
    • H01M8/0286—Processes for forming seals
    • 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
    • H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
    • 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
    • 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 present invention relates to an electrochemical device, which comprises:
  • At least one medium channel which extends through a plurality of the electrochemical units along the stacking direction
  • sealing system comprises a flow field sealing arrangement which extends around at least one flow field and at least one medium channel sealing arrangement which extends around a medium channel.
  • the sealing system is connected to one or more gas diffusion layers of the membrane electrode arrangement, so that a so-called seal-on-GDL unit is created.
  • there are larger areas of the sealing system especially in the area of the medium channel sealing arrangements, which are mechanically unstable. Only the areas of the sealing system in the vicinity of the gas diffusion layers, in particular areas of the flow field sealing arrangement, are stabilized by the mechanical rigidity of the gas diffusion layers.
  • these mechanically unstable areas of the sealing system are disadvantageous in the assembly process of the electrochemical device, in particular in the assembly process of the membrane electrode assembly itself and in the assembly process of the membrane electrode assembly on the bipolar plate.
  • the positioning accuracy of the sealing system in the area of the medium channels is significantly reduced by the instability of the sealing system in this area, or an adequate positioning may not be possible at all. This increases the complexity and the costs of the assembly processes that are required to manufacture the electrochemical device.
  • the present invention has for its object to provide an electrochemical device of the type mentioned, in which the
  • Sealing system has a high mechanical stability and can be precisely positioned during assembly of the electrochemical device.
  • this object is achieved according to the invention in that the flow field sealing arrangement is fixed on the membrane electrode arrangement and the at least one medium channel sealing arrangement is fixed on the bipolar plate.
  • the solution according to the invention is based on the concept of mechanically stabilizing the areas of the sealing system which are further away from the membrane electrode arrangement, in particular from the gas diffusion layers, by connection to the bipolar plate and thus to improve their positioning accuracy during assembly of the electrochemical device.
  • the flow field sealing arrangement which seals the electrochemically active area of an electrochemical unit and is located in the immediate vicinity of the membrane electrode arrangement, is connected to the membrane electrode arrangement.
  • the membrane electrode arrangement comprises two gas diffusion layers and the flow field sealing arrangement is fixed to at least one of the gas diffusion layers.
  • the flow field sealing arrangement forms a seal-on-GDL unit together with the at least one gas diffusion layer.
  • the flow field sealing arrangement comprises two flow field sealing elements, each of which is fixed to one of the gas diffusion layers.
  • the flow field sealing arrangement is thus formed in several parts, in particular in two parts.
  • the bipolar plate can in particular comprise at least two bipolar plate layers, and the medium channel sealing arrangement can comprise a medium channel sealing element which is fixed to one of the bipolar plate layers or to both bipolar plate layers.
  • the medium channel sealing element can have been produced on one of the bipolar plate layers before the bipolar plate layers have been fixed to one another. It is possible to position the individual bipolar plate layer on which a
  • Injection molded sealing element is supported on the side facing away from the sealing element.
  • a tool edge which, for example, a
  • Injection mold cavity seals to the environment can be placed with sufficient contact pressure on the bipolar plate layer during the creation of the medium channel sealing element.
  • the bipolar plate layers are fixed to one another along connecting lines, in particular welding lines, which the medium channel sealing element - viewed along the stacking direction - do not cross.
  • the medium channel sealing element has been produced on one of the bipolar plate layers after the bipolar plate layers have been fixed to one another. In this case, damage to the medium channel sealing element by the joining process, by means of which the bipolar plate is formed from the bipolar plate layers, is excluded from the outset.
  • the medium channel seal arrangement can be produced, for example, by means of an injection molding process.
  • the medium channel sealing arrangement is produced by means of a screen printing process.
  • the medium channel sealing arrangement is arranged, in particular fixed, on a bead which is formed in a bipolar plate position of the bipolar plate.
  • the medium channel sealing arrangement bears in a fluid-tight manner on a bead which is formed in a bipolar plate layer of a bipolar plate.
  • the height h of the medium-channel sealing arrangement is preferably less than the height Hi of the bead at which the medium-channel sealing arrangement is fixed and / or less than the height H2 of the bead at which the medium-channel sealing arrangement in the assembled state the electrochemical device is fluid-tight. As an alternative or in addition to this, it can be provided that the height h of the medium channel sealing arrangement is less than the sum of the heights Hi and Hz.
  • the height of an element is to be understood as the extent thereof along the stacking direction.
  • the flow gate preferably comprises a medium passage opening which is formed in the bead on which the medium channel sealing arrangement is fixed or is formed in the bead which is in fluid-tight contact with the medium channel sealing arrangement in the assembled state of the electrochemical device.
  • the medium passage opening is preferably formed on the side of the respective bead facing the medium channel.
  • one of the bipolar plate layers of the bipolar plate has an edge web running around the flow field, it can be provided that a medium passage opening is formed in the edge web.
  • Such a medium passage opening can in particular form part of a flow gate through which the medium channel and the flow field are in fluid communication with one another.
  • the medium passage opening formed in the edge web is preferably arranged on the side of the edge web facing the flow field.
  • the flow field sealing arrangement can be produced in particular by means of an injection molding process, a screen printing process or a dispenser application process.
  • the present invention further relates to a method for producing an electrochemical device which
  • At least one medium channel which extends through a plurality of the electrochemical units along the stacking direction
  • sealing system comprises a flow field sealing arrangement which extends around at least one flow field and at least one medium channel sealing arrangement which extends around a medium channel.
  • the present invention is based on the further object of creating such a method for producing an electrochemical device which achieves high mechanical stability and high positioning accuracy of the sealing system in the manufacture of the electrochemical device.
  • the method according to the invention is particularly suitable for producing an electrochemical device according to the invention.
  • the electrochemical device can in particular be designed as a fuel cell device or an electrolyzer.
  • the fuel cell device can in particular be designed as a polymer electrolyte membrane fuel cell device.
  • the bipolar plate can comprise one or more individual layers.
  • the membrane-electrode unit can in particular comprise a membrane, an anode-side catalyst element, a cathode-side catalyst element and preferably two gas diffusion layers.
  • the electrochemical device comprises manifolds or media channels, via which fluid media, in particular an oxidizing agent, a fuel gas and / or a coolant, can be fed to the electrochemical units in the stacking direction of the electrochemical device and can be removed from the electrochemical units.
  • the electrochemical device can comprise flow gates, via which a fluid medium is fed from a medium channel to a flow field or to the electrochemically active area of an electrochemical unit, or via which a fluid medium from the flow field or from the electrochemically active area to the electrochemical unit a medium channel can be led away.
  • the sealing system seals the media spaces for the anode-side fluid medium, the cathode-side fluid medium and possibly the coolant against one another and against the environment.
  • the flow field sealing arrangement runs around the electrochemically active area of the electrochemical unit.
  • Each of the medium channel sealing arrangements runs around a medium channel or around a medium passage opening in the bipolar plate.
  • the flow field sealing arrangement which runs around the electrochemically active area, is connected to the membrane electrode arrangement.
  • the medium channel sealing arrangements which each run around a medium channel, are connected to the bipolar plate.
  • the flow field sealing arrangement can consist of two parts, each of which is connected to one of the two gas diffusion layers of the membrane electrode arrangement.
  • the medium channel sealing arrangement and / or the flow field sealing arrangement can be produced by means of injection molding, screen printing, dispenser application or by a similar process.
  • Each of the medium channel sealing arrangements can be connected to a single layer of the bipolar plate or to a bipolar plate consisting of several individual layers.
  • the process in which the respective medium channel sealing arrangement is produced on the bipolar plate can be followed by a joining process, in particular a welding process, in which several layers of the bipolar plate are joined to one another, in particular welded to one another.
  • Fig. 1 is a partial schematic plan view of a
  • FIG. 2 shows a schematic section through the oxidant supply of the electrochemical unit from FIG. 1, along the line 2-2 in FIG. I;
  • Fig. 3 is a partial schematic plan view of a second
  • Embodiment of an electrochemical unit of an electrochemical device comprising a plurality of electrochemical units which follow one another in a stacking direction, in the region of a residual fuel gas discharge, a coolant supply and an oxidant supply;
  • Fig. 4 shows a schematic section through the fuel gas supply
  • a fuel cell device or an electrolyser designated as a whole by 100, for example a fuel cell device or an electrolyser, comprises a stack 102 which comprises a plurality of electrochemical units 106, for example fuel cell units or electrolysis units, which follow one another in a stacking direction 104. and a clamping device (not shown) for applying a clamping force directed along the stacking direction 104 to the electrochemical units.
  • each electrochemical unit 106 of the electrochemical device 100 comprises a bipolar plate 108, a membrane electrode assembly (MEA) 110 and a sealing system
  • the membrane electrode arrangement 110 comprises, for example, a catalyst coated membrane (CCM) 113 and two gas diffusion layers 114 and 116, a first gas diffusion layer 114 being arranged on the anode side and a second gas diffusion layer 116 on the cathode side.
  • CCM catalyst coated membrane
  • the bipolar plate 108 is formed, for example, from a metallic material.
  • the bipolar plate 108 has a plurality of medium passage openings 118, through which a fluid medium to be fed to the electrochemical device 100 (in the case of a fuel cell device, for example, a fuel gas, an oxidizing agent or a coolant) can pass through the bipolar plate 108.
  • a fluid medium to be fed to the electrochemical device 100 in the case of a fuel cell device, for example, a fuel gas, an oxidizing agent or a coolant
  • the medium passage openings 118 of the successive bipolar plates 108 in the stack 102 and the intermediate spaces lying in the stacking direction 104 between the medium passage openings 118 each form a medium channel 120.
  • Each medium channel 120, through which a fluid medium can be supplied to the electrochemical device 100, is assigned at least one other medium channel, through which the fluid medium in question can be removed from the electrochemical device 100.
  • the medium from the first medium channel 120 can cross, preferably essentially flow perpendicular to the stacking direction 104 to the second medium channel.
  • 1 shows, for example, a medium channel 124 for an oxidizing agent of the electrochemical device 100, a medium channel 126 for a coolant of the electrochemical device 100 and a medium channel 128 for a fuel gas or a residual fuel gas of the electrochemical device 100.
  • Each medium channel 120 is in fluid communication with the respectively associated flow field 122 through a flow gate 130.
  • each bipolar plate 108 comprises a first bipolar plate layer 132 and a second bipolar plate layer 134, the along connecting lines 136, which in FIG.
  • broken lines are shown, preferably in a fluid-tight manner, in particular by welding, for example by laser welding.
  • the medium channel 124 for oxidizing agent is in fluid communication via a flow gate 138 for oxidizing agent with a flow field 140 for the oxidizing agent, which is formed between the second bipolar plate layer 134 and the second gas diffusion layer 116.
  • the flow gate 138 comprises a connection chamber 142, which is formed by a space between the first bipolar plate layer 132 and the second bipolar plate layer 134 and has inlet openings 144 facing the oxidant medium in fluid communication with the medium channel 124 and above the flow field 140 for the oxidant facing outlet openings 146 is in fluid communication with the flow field 140.
  • the medium channel 126 for coolant is in fluid communication with a flow field via a flow gate 148 for coolant, which is formed by a space between the first bipolar plate layer 132 and the second bipolar plate layer 134 of the bipolar plate 108 for the coolant which is formed in the space between the first bipolar plate layer 132 and the second bipolar plate layer 134.
  • the medium channel 128 for fuel gas or residual fuel gas is in fluid communication with a flow field for the fuel gas, which is formed between the first bipolar plate layer 132 and the first gas diffusion layer 114, via a flow gate 150 for fuel gas.
  • the first bipolar plate layer 132 and the second bipolar plate layer 134 of the bipolar plate 108 are provided in the region of the flow fields 122 with flow guide elements 152, which can be designed, for example, in the form of raised beads ,
  • the sealing system 112 prevents an undesired escape of the fluid media from the medium channels 120 and the flow fields 122 of the electrochemical device.
  • the sealing system 112 includes a flow field seal assembly 154 that extends around the flow fields 122.
  • the sealing lines 156 of this flow field sealing arrangement 154 are shown in the top view of FIG. 1 by dash-and-dot lines.
  • the sealing system 112 comprises a plurality of medium channel sealing arrangements 158, which each extend around a medium channel 120.
  • the sealing lines 160 of these medium-channel sealing arrangements 158 are shown in the top view of FIG. 1 by dash-dotted lines.
  • the flow field sealing arrangement 154 comprises a first flow field sealing element 162, which is fixed on the (anode-side) first gas diffusion layer 114, and a second flow field sealing element 164, which on the ( cathode-side) second gas diffusion layer 116 is fixed.
  • the flow field sealing elements 162 and 164 are preferably produced by means of an injection molding process, a screen printing process or a dispenser application process on the respectively assigned gas diffusion layer 114 or 116.
  • the flow field sealing elements 162 and 164 preferably comprise an elastomer material and in particular can be formed essentially entirely from an elastomer material.
  • the flow field sealing elements 162 and 164 preferably abut one another in a fluid-tight manner without being fixed to one another.
  • the first flow field sealing element 162 and the second flow field sealing element 164 are preferably - seen in the stacking direction 104 - congruent with one another.
  • each of the flow field sealing elements 162 and 164 is in fluid-tight contact with a bipolar plate layer 132 or 134 without being fixed to the bipolar plate layer 132 or 134 in question.
  • Each of the medium channel sealing arrangements 158 preferably comprises a medium channel sealing element 166, which is fixed to one of the bipolar plate layers 132 or 134 of the bipolar plate 108, for example to the first bipolar plate layer 132.
  • the medium-channel sealing element 166 lies with a sealing surface 168 on the bipolar plate 108 of an electrochemical unit 106 adjacent in the stacking direction 104 in a fluid-tight manner.
  • the medium channel sealing element 166 can be produced on the bipolar plate 108, for example, by means of an injection molding process, a screen printing process or a dispenser application process.
  • the medium channel sealing element 166 preferably comprises an elastomer material and can, in particular, essentially consist entirely of one
  • the medium channel sealing element 166 can have been produced on one of the bipolar plate layers 132, 134 of the bipolar plate 108 after the bipolar plate layers 132 and 134 have been fixed to one another.
  • the medium channel sealing element 166 has been produced on one of the bipolar plate layers 132, 134 before the bipolar plate layers 132 and 134 have been fixed to one another.
  • the connecting lines 142 in particular welding lines, along which the bipolar plate layers 132 and 134 are fixed to one another, do not cross the medium-channel sealing element 166 — viewed along the stacking direction 104 — so that damage to the
  • Medium channel sealing arrangement 158 is avoided during the connection process of the bipolar plate layers 132 and 134, in particular during a welding process, by means of which the bipolar plate layers 132 and 134 are fixed to one another.
  • the medium channel sealing arrangements 158 which extend around the medium channels 120, were produced in one operation on the bipolar plate 108 of the respective electrochemical unit 106.
  • the flow field sealing elements 162 and 164 of the flow field sealing arrangement 154 have each been produced at one of the gas diffusion layers 114 or 116.
  • the large medium channel sealing arrangements 158 By connecting the large medium channel sealing arrangements 158 to the bipolar plate 108, in particular in a tool-based process (for example in an injection molding process or a screen printing process), the otherwise expensive positioning of the sealing system 112 in the area of the medium channels 120 relative to the bipolar plate 108 is eliminated the assembly of the electrochemical device 100.
  • the positioning tolerance of the sealing system 112 on the bipolar plate 108 is therefore composed only of the positioning tolerance of the bipolar plate 108 in the tool that is used to manufacture the medium channel sealing arrangements 158 and the manufacturing tolerance, in particular the tool tolerance, of the medium channel sealing arrangements 158 ,
  • the two seal-on-GDL units 170 are assembled together with the membrane 113 of the membrane-electrode assembly 110 during the assembly of the electrochemical device 100.
  • a second embodiment of an electrochemical device 100 shown in FIGS. 3 and 4 differs from the first embodiment shown in FIGS. 1 and 2 in that the medium channel sealing arrangements 158 each have a bead 172 which is arranged in a of the bipolar plate layers 132, 134 of the bipolar plate 108 is formed.
  • the height h of the medium channel sealing arrangement 158 is preferably less than the height Hi of the bead 172 in the bipolar plate layer 132 or 134, at which the medium channel sealing arrangement 158 is fixed.
  • the medium channel sealing arrangement 158 bears in the assembled state of the electrochemical device 100 via a sealing surface 168 on the bipolar plate 108 of an electrochemical unit 106 adjacent in the stacking direction 104.
  • a bead 174 is preferably also formed in the bipolar plate layer 134 or 132, on which the medium channel sealing arrangement 158 with the sealing surface 168 is in a fluid-tight manner, on which the medium channel sealing arrangement 158 lies.
  • the height h of the medium-channel sealing arrangement 158 is preferably less than the height H2 of the bead 174 in the bipolar plate layer 134 or 132, against which the medium-channel sealing arrangement 158 bears in a fluid-tight manner in the assembled state of the electrochemical device 100.
  • the height h of the medium channel seal arrangement 158 is less than the sum of the height Hi of the bead 172 in the bipolar plate layer 132 or 134, on which the medium channel seal arrangement 158 is fixed, and the height H2 of the bead 174 in the bipolar plate layer 134 or 132, on which the medium channel seal arrangement 158 bears in a fluid-tight manner in the assembled state of the electrochemical device 100, without being fixed thereon.
  • the required height h of the medium channel sealing arrangement 158 in the area of these beads 172, 174 is reduced, so that in particular less elastomer material is required for the production of the medium channel sealing arrangement 158.
  • the medium channel sealing arrangement 158 can be easily produced on the bipolar plate 108 after the two bipolar plate layers 132 and 134 have been fixed to one another, for example by a welding process.
  • the two bipolar plate layers 132 and 134 are fixed to one another, in particular by a welding process, before a seal has been produced on the bipolar plate layers 132, 134, so that there is no risk of such a seal being contaminated by the joining process consists.
  • the connecting lines 136, in particular the welding lines, along which the two bipolar plate layers 132 and 134 are fixed to one another can easily cross the medium channel sealing arrangements 158 — viewed in the stacking direction 104 — since the medium channels - Sealing arrangements 158 are only produced after the bipolar plate layers 132 and 134 have been connected to one another and therefore no damage to the medium channel sealing arrangements 158 can occur during the joining process of the bipolar plate layers 132 and 134.
  • FIG. 4 shows a schematic section through the second embodiment of the electrochemical device 100 in the region of a flow gate 150 for the fuel gas.
  • the flow gate 150 comprises a connecting chamber 142, which is formed by a space between the first bipolar plate layer 132 and the second bipolar plate layer 134 and has inlet openings 144 facing the fuel channel or residual fuel gas in fluid communication with the medium channel 128 and above the flow field 176 for the fuel gas facing outlet openings 146 is in fluid communication with the flow field 176 for the fuel gas.
  • the inlet openings 144 are preferably formed in the bead 172, on which the medium channel sealing arrangement 158 is arranged, specifically preferably on the side of the bead 172 facing the medium channel 120.
  • the outlet openings 146 of the flow gate 130 are preferably formed in an edge web 178 which runs around the flow field 120, in particular the flow field 176 for the fuel gas, preferably on the side of the edge web 178 facing the flow field 120.
  • the flow field sealing arrangement 154 preferably has a lower height than in sections lying outside the flow gates 130.
  • the second embodiment of an electrochemical device 100 shown in FIGS. 3 and 4 corresponds in structure, function and method of manufacture to the first embodiment shown in FIGS. 1 and 2, to the above description of which reference is made in this regard ,

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

Abstract

Dispositif électrochimique comprenant un empilement de plusieurs unités électrochimiques se succédant dans un sens d'empilement, lesquelles sont pourvues chacune d'un ensemble membrane active de manière électrochimique-électrodes, d'une plaque bipolaire et d'un système d'étanchéité, au moins un canal de milieu qui s'étend à travers plusieurs des unités électrochimiques dans le sens d'empilement, et au moins un champ d'écoulement à travers lequel un milieu peut s'écouler à partir du canal de milieu perpendiculairement au sens d'empilement du canal de milieu vers un autre canal de milieu, le système d'étanchéité comprenant un ensemble d'étanchéité de champ d'écoulement qui s'étend autour d'au moins un champ d'écoulement, et au moins un ensemble d'étanchéité de canal de milieu qui s'étend autour d'un canal de milieu. Selon l'invention, l'ensemble d'étanchéité de champ d'écoulement est fixé sur l'ensemble membrane-électrodes et l'au moins un ensemble d'étanchéité de canal de milieu est fixé sur la plaque bipolaire afin d'obtenir un système d'étanchéité avec une grande stabilité mécanique et pouvant être positionné de manière précise durant le montage du dispositif électrochimique.
EP19737677.5A 2018-07-02 2019-06-28 Dispositif électrochimique Pending EP3818197A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018115983.8A DE102018115983A1 (de) 2018-07-02 2018-07-02 Elektrochemische Vorrichtung
PCT/EP2019/067370 WO2020007735A1 (fr) 2018-07-02 2019-06-28 Dispositif électrochimique

Publications (1)

Publication Number Publication Date
EP3818197A1 true EP3818197A1 (fr) 2021-05-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19737677.5A Pending EP3818197A1 (fr) 2018-07-02 2019-06-28 Dispositif électrochimique

Country Status (5)

Country Link
US (1) US20210126275A1 (fr)
EP (1) EP3818197A1 (fr)
CN (1) CN112352066A (fr)
DE (1) DE102018115983A1 (fr)
WO (1) WO2020007735A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022113249A1 (de) 2022-05-25 2023-11-30 Ekpo Fuel Cell Technologies Gmbh Elektrochemische Vorrichtung

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Publication number Priority date Publication date Assignee Title
EP1568092A4 (fr) * 2002-11-18 2009-06-17 Protonex Technology Corp Empilement de piles electrochimiques a membranes
JP4096027B2 (ja) * 2006-06-26 2008-06-04 松下電器産業株式会社 固体高分子電解質型燃料電池
DE102006054849A1 (de) * 2006-11-20 2008-05-21 Behr Gmbh & Co. Kg Bipolarplatte, insbesondere für eine Brennstoffzelle
DE102007003096A1 (de) * 2007-01-16 2008-07-17 Carl Freudenberg Kg Dichtungsanordnung für ein Plattenelement einer Brennstoffzelle
DE102014104017A1 (de) * 2014-03-24 2015-09-24 Elringklinger Ag Elektrochemische Vorrichtung

Also Published As

Publication number Publication date
US20210126275A1 (en) 2021-04-29
WO2020007735A1 (fr) 2020-01-09
CN112352066A (zh) 2021-02-09
DE102018115983A1 (de) 2020-01-02

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