WO2021122169A1 - Procédé destiné à produire un joint pour une unité électrochimique d'un dispositif électrochimique et ensemble pour un dispositif électrochimique - Google Patents

Procédé destiné à produire un joint pour une unité électrochimique d'un dispositif électrochimique et ensemble pour un dispositif électrochimique Download PDF

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Publication number
WO2021122169A1
WO2021122169A1 PCT/EP2020/085112 EP2020085112W WO2021122169A1 WO 2021122169 A1 WO2021122169 A1 WO 2021122169A1 EP 2020085112 W EP2020085112 W EP 2020085112W WO 2021122169 A1 WO2021122169 A1 WO 2021122169A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
bipolar plate
tool
electrochemical
plate layer
Prior art date
Application number
PCT/EP2020/085112
Other languages
German (de)
English (en)
Inventor
Peter Stahl
Manuel SALZMANN
Thomas DIX-LANDGRAF
Andreas Schmid
Paul Volz
Jürgen KRAFT
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 WO2021122169A1 publication Critical patent/WO2021122169A1/fr

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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
    • H01M8/02—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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • 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
    • H01M8/028—Sealing means characterised by their material
    • H01M8/0284—Organic resins; Organic polymers
    • 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
    • H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
    • 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
    • H01M8/002—Shape, form of a fuel cell
    • H01M8/006—Flat
    • 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
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a method for producing a seal for an electrochemical unit of an electrochemical device, the method comprising:
  • the electrochemical device can in particular be a fuel cell device, an electrolyzer or a battery cell stack.
  • the outer areas of such a seal are unsupported areas which, due to the lack of connection to a dimensionally stable component, have great mechanical instability. This can cause great difficulties when assembling the electrochemical unit and / or when assembling the electrochemical device from the electrochemical units that follow one another along a stacking direction of the electrochemical device, since the areas of the seal which conduct medium channels from the electrochemical Fluid media to be supplied to the device or for the removal of fluid media from the electrochemical device, can only be positioned with large positioning tolerances on the respectively adjacent bipolar plates of the electrochemical device or have to be prepositioned with a high level of assembly effort. In addition, the removal of a seal from a molding tool is complex, since the seal must not be damaged during removal from the mold and, due to the low rigidity of the seal, can only be gripped with difficulty.
  • the present invention has for its object to provide a method for producing a seal for an electrochemical unit of an electrochemical mixing device of the type mentioned, which light made it possible to separate the seal in a simple manner undamaged from the shaping tool and preferably a precise positioning the you direction relative to other components of the electrochemical unit to he aim.
  • the present invention is based on the concept of producing a seal in a tool-related process, for example in an injection molding process, with the seal on another component of the electrochemical unit, in particular on a component of a membrane-electrode arrangement, for example on a gas diffusion layer, can be connected.
  • the seal remains on a tool part of the molding tool.
  • the tool part on which the seal remains when the forming tool is opened can be a movable tool part or an immovable tool part of the forming tool.
  • the tool part on which the seal remains when the molding tool is opened can have at least one channel and / or at least one nozzle for introducing an injection molding material into a cavity of the molding tool.
  • At least one bipolar plate layer of a bipolar plate is moved towards the seal remaining on the tool part of the shaping tool and connected to the seal by form fit, material connection and / or force connection. Then the bipolar plate layer or the bipolar plate together with the seal is moved away from the tool part of the shaping tool.
  • the unit of bipolar plate layer or bipolar plate and the seal associated therewith can easily be further processed, stored and assembled together with other components to form the electrochemical device, since the unit of bipolar plate layer or bipolar plate and seal is very high compared to the insulated seal Has dimensional stiffness and can therefore be positioned much more easily.
  • the seal and the at least one bipolar plate layer are connected to one another by means of at least one connecting element.
  • a connecting element can in particular be designed in one piece with a base body of the seal.
  • the main body of the seal can in particular be formed from an elastic material, preferably from an elastomer material.
  • the connecting element can be formed from the same material as the base body of the seal or from a material different from the material of the base body.
  • the connecting element can be formed from a thermoplastic material, for example.
  • the connecting element can in particular be formed from a thermoplastic elastomer (TPE).
  • TPE thermoplastic elastomer
  • the connecting element can be introduced as an insert into the molding tool before the seal is produced, or it can be produced in the molding tool as a first component of a two-component injection molding process before the main body of the seal forming the second component.
  • At least one connecting element preferably comprises an undercut area which engages behind the at least one bipolar plate layer.
  • the undercut area can have any shape, for example the shape of a mushroom, a drop or the tip of an arrow.
  • at least one connecting element comprises an undercut area which is arranged on the bipolar plate layer and engages behind the seal.
  • Such a connecting element can in particular be designed in one piece with the relevant bipolar plate layer.
  • the seal and the at least one bipolar plate layer are connected to one another by a material bond.
  • Such a material connection can be generated, for example, by means of a material connection element that is arranged on the seal and / or on the at least one bi-polar plate layer.
  • Such a material connection element can contain, for example, an adhesive, a resin and / or an adhesion promoter.
  • the seal has a degree of crosslinking of less than 100% when the forming tool is opened, preferably a degree of crosslinking of less than 80%.
  • the at least one bipolar plate layer can be brought into contact with the incompletely crosslinked seal, whereupon further crosslinking of the material of the seal takes place, as a result of which a material connection is established between the seal and the at least one bipolar plate layer.
  • the at least one bipolar plate layer is pretreated with an adhesion promoter.
  • the material of the seal can also contain an adhesion promoter.
  • areas can be provided which serve to generate an increased local compressive stress on the seal and the at least one bipolar plate layer, while the seal and the at least one bipolar plate layer are in contact with one another. These areas are preferably where there is at least one connecting element of the seal.
  • the seal is pressed against the at least one bipolar plate layer by means of a pressing device.
  • Such a pressing device can in particular comprise a movable pin arranged in the tool part on which the seal remains after the molding tool has been opened. Such a pin can be moved against the seal in order to press the seal against the at least one bi-polar plate layer.
  • the seal in the shaping tool is molded onto a component of a membrane-electrode arrangement of the electrochemical unit, in particular onto a gas diffusion layer.
  • the seal is connected to at least two bipolar plate layers which have been connected to one another before they are connected to the seal.
  • the two bipolar plate layers can in particular have been connected to one another by gluing or by welding, in particular by laser welding. Furthermore, it can be provided that an assembly which comprises the at least one bipolar plate layer and the seal connected to it is connected to a further seal, in particular by a form fit, material fit and / or force fit.
  • the assembly is connected to the further seal while the further seal is arranged on a tool part of a molding tool in which the seal has been produced, for example by an injection molding process.
  • the present invention also relates to an assembly for an electrochemical device which comprises at least one bipolar plate layer and a device you.
  • the present invention is based on the further object of providing such an assembly for an electrochemical device, which allows easy and damage-free removal of the seal from a molding tool and preferably also precise positioning of the device relative to other components of the electrochemical device during assembly of the electrochemical device.
  • an assembly for an electrochemical device which has at least one bipolar plate layer and at least one seal produced in a shaping tool separately from the at least one bipolar plate layer, which is connected to the at least one bipolar plate layer by form fit, material connection and / or force connection is, includes.
  • Special configurations of the assembly according to the invention for an electrochemical device have already been explained above in connection with particular configurations of the method according to the invention.
  • the method according to the invention is particularly suitable for producing the assembly according to the invention for an electrochemical device.
  • the assembly according to the invention for an electrochemical device is preferably produced according to the method according to the invention.
  • the assembly according to the invention for an electrochemical device is particularly suitable for use in an electrochemical Vorrich device which comprises a plurality of electrochemical units following one another along a stacking direction, each of which comprises such an assembly according to the invention.
  • the seal can have two sealing sections, a sealing section on the anode side preferably being connected to an anode-side gas diffusion layer and a cathode-side sealing section being connected to a gas diffusion layer on the cathode side.
  • At least one connecting element of the device engages behind the at least one bipolar plate layer on the outer circumference of the bipolar plate layer.
  • a connecting element engages behind the min least one bipolar plate layer along its entire outer circumference. If the seal and the at least one bipolar plate layer are connected to one another by a material connection by means of a material connection element, the material of the material connection element, which contains, for example, an adhesive, a resin and / or an elastomer, can be cured and / or crosslinked by the input of heat while the seal is in contact with the at least one bipolar plate layer.
  • the heat for curing and / or crosslinking the material of the material connection element can be introduced, in particular via the tool part on which the log device remains after the shaping tool has been opened.
  • the seal can have at least one retaining element, by means of which the seal is reliably retained on a predetermined tool part of the shaping tool when the shaping tool is opened.
  • Such a retaining element can hold the seal back on the relevant tool part by means of a force fit, material fit and / or form fit.
  • Such a retaining element can in particular have a rich undercut area.
  • Such a retaining element can be removed and / or destroyed before the seal, together with the at least one bipolar plate layer, is moved away from the tool part on which the seal remains when the forming tool is opened.
  • the retaining element can be destroyed and / or removed, for example, by means of a punching process or a tearing process.
  • the seal can also be attached to a membrane-electrode arrangement comprising two gas diffusion layers and a membrane, to an edge reinforcement, to an edge reinforcement connected to a membrane, to one with one or two Edge reinforcement connected to gas diffusion layers or to an edge reinforcement connected to a membrane and with one or two gas diffusion layers.
  • the assembly which comprises the unit of the seal and the gas diffusion layer as well as the bipolar plate layer or the bipolar plate, can be used together in a subsequent stacking process a membrane and / or a second unit made of a seal and a gas diffusion layer are stacked.
  • the first unit of seal and gas diffusion layer which has been connected to the bipolar plate layer or the bipolar plate for demolding from the molding tool, preferably comprises at least one sealing area which extends around a medium channel of the electrochemical device.
  • a sealing area extending around a medium channel has a particularly low inherent stiffness, so that the increase in the dimensional stiffness of the seal by the bipolar plate layer or the bipolar plate has a particularly favorable effect in this case.
  • two units each comprising a seal and a gas diffusion layer
  • a bipolar plate facing away from one another and in particular connected to the bipolar plate by means of at least one connecting element in each case.
  • these assemblies which each include a bipolar plate, two seals and two gas diffusion layers, are stacked on top of one another in alternation with membranes, in particular with catalyst-coated membranes (CCM).
  • CCM catalyst-coated membranes
  • At least one connecting element for connecting a seal to at least one bipolar plate layer can be designed so that a relative movement between the seal and the at least one bipolar plate layer, for example due to different thermal expansions and / or due to shrinkage of the seal, in one or two spatial directions is possible.
  • the seal can comprise at least one sealing area which, in the assembled state of the electrochemical device, extends around a medium channel of the electrochemical device.
  • Such a sealing area can be connected to a gas diffusion layer on the anode side or to a gas diffusion layer on the cathode side.
  • all sealing areas of the seal surrounding a medium channel are connected to an anode-side gas diffusion layer or that all sealing areas of the seal surrounding a medium channel are connected to a cathode-side gas diffusion layer.
  • at least one sealing area of the seal surrounding a medium channel is connected to an anode-side gas diffusion layer and that at least one other sealing area of the seal surrounding a medium channel is connected to a cathode-side gas diffusion layer.
  • the bipolar plate layers of the bipolar plate can be formed from a metallic material or from a graphitic material.
  • the bipolar plate layers of the bipolar plate can be materially connected to one another, for example, by a welding process.
  • the seal can be formed from an elastomer material.
  • the seal can be produced in an injection molding process and at the same time firmly connected to a gas diffusion layer.
  • a gas diffusion layer is inserted into the molding tool, in particular an injection molding tool, and the injection molding material from which the seal is formed is overmolded.
  • the present invention enables a seal of an electrochemical unit to be produced without edge reinforcement and with a very compact structure and to be precisely positioned relative to the bipolar plate of the electrochemical unit.
  • the bipolar plate can be easily cleaned after its bipolar plate layers have been connected to one another by a welding process or an adhesive process, since there is no sealing material on the bipolar plate at this time.
  • a welding process for producing a multilayered bipolar plate from several bipolar plate layers can be carried out with a lower level of quality assurance effort, since no other components, in particular no membrane-electrode arrangement and / or no seal, are attached to one of the bipolar plate layers during the welding process be found, which would have to be checked for functionality and / or possible contamination after the welding process.
  • Fig. 1 is a schematic exploded view of two electrochemical's units of an electrochemical device, which follow one another along a stacking direction of the electrochemical device and each have an assembly that has a bipolar plate, a gas diffusion layer and a forming tool generated separately from the bipolar plate and attached to the Gas diffusion layer molded seal, which is connected to the bipolar plate by form fit, material connection and / or force connection, comprises an electrochemically active membrane and a further gas diffusion layer to which a further seal has been molded in a molding tool;
  • FIG. 4 is a fragmentary plan view of the bipolar plate from Figure 3, looking along the arrow 4 in Figure 3, on the device facing away from the back of the bipolar plate.
  • FIGS. 3 and 4 show a schematic partial cross-section through a further variant of the embodiment shown in FIGS. 3 and 4 of an assembly comprising a seal and bipolar plate, the undercut area of the connecting element having, for example, a teardrop shape;
  • Tool part of a shaping tool on which a seal formed on a gas diffusion layer is arranged the seal being connected to a bipolar plate by means of a connecting element and the tool part of the shaping tool comprising a pressing device for pressing a region of the seal comprising the connecting element onto the bipolar plate;
  • FIG. 9 is a schematic exploded view of two electrochemical units of an electrochemical device, which along a stacking direction of the electrochemical device follow one another and in each case an assembly which comprises a bipolar plate and two seals produced separately from the bipolar plate in a respective forming tool and each molded onto a gas diffusion layer, which are connected to the bipolar plate by form fit, material connection and / or force connection, and an electrochemically active membrane;
  • FIGS. 3 and 4 show a schematic partial cross section through a further variant of the embodiment shown in FIGS. 3 and 4 of an assembly comprising a seal and a bipolar plate, the seal having a stepped passage opening and the bipolar plate having a connecting element engaging behind the seal;
  • FIG. 11 shows a schematic representation of a method for producing the assembly from FIG. 10, with a bipolar plate held on a holding device being shown between a first tool part and a second tool part of a shaping tool.
  • An electrochemical device shown schematically in FIG. 1 and designated as a whole by 100 comprises several electrochemical units 104 following one another along a stacking direction 102 of the electrochemical device 100, two of which are shown schematically in FIG. 1 in the form of an exploded view.
  • Each of the electrochemical units 104 comprises an assembly 106, which comprises a bipolar plate 108 and a seal 114 produced separately from the bipolar plate 108 in a shaping tool 110 (see FIG. 2) and molded onto a gas diffusion layer 112, as well as an electrochemically active membrane 116, for example a catalyst-coated membrane (CCM), in particular a polymer electrolyte membrane (PEM), and a second gas diffusion layer 118, onto which a second seal 120 is molded.
  • CCM catalyst-coated membrane
  • PEM polymer electrolyte membrane
  • the bipolar plate 108 can be multi-layered, in particular two-layered, and in particular comprise a first bipolar plate layer 122, which faces the seal 114, and a second bipolar plate layer 124, which faces away from the device 114.
  • the shaping tool 110 by means of which the seal 114 is produced in a shaping process and is preferably connected to the gas diffusion layer 112 in a materially bonded manner, comprises a first tool part 126 (shown in detail in FIG. 2) and a second tool part (not shown), which during of the shaping process rests against the first tool part 126 and is removed from the first tool part 126 after the shaping process in order to open the shaping tool 110.
  • the seal 114 remains together with the gas diffusion layer 112 on the first tool part 126.
  • the unit 128 of gas diffusion layer 112 and seal 114 is held back by at least one retaining element (not shown), which can have an undercut area, when the shaping tool 110 is opened on the first tool part 126.
  • the molding process can in particular be an injection molding process in which the seal 114 is formed in the molding tool 110 by injecting and at least partially crosslinking an injection molding material.
  • connection of the seal 114 to the gas diffusion layer 112 inserted into the molding tool 110 before the injection molding process can in particular take place in that the injection molding material penetrates in some areas into the porous material of the gas diffusion layer 112 and hardens there.
  • the seal 114 comprises at least one connecting element 130, which is preferably formed in one piece with a base body 132 of the seal 114.
  • the connecting element 130 comprises an undercut area 134, which is connected to the base body 132 of the seal 114 via a support area 136 and has a larger diameter than the support area 136.
  • the connecting element 130 is assigned a passage opening 138 in the bipolar plate 108, which in the case of the two-layer bipolar plate 108 extends through the first bipolar plate layer 122 and through the second bipolar plate layer 124.
  • the undercut region 134 of the connecting element 130 can, for example, have a spherical segment shape, in particular a hemispherical shape.
  • the connecting element 130 can have a mushroom shape overall.
  • the number of connecting elements 130 is selected so that, in particular, mechanically unstable areas of the seal 114, for example in the area of medium channel openings of the seal 114, can be reliably and precisely positioned relative to the bipolar plate 108.
  • the number of connecting elements 130 is preferably at least two, in particular at least four, particularly preferably at least six.
  • the through opening 138 of the bipolar plate 108 can be designed as an elongated hole 140 which has a longitudinal extent L in a longitudinal direction 142 (preferably lying essentially parallel to the main surfaces of the bipolar plates 122 and 124) which is greater than the transverse extent I which the elongated hole 140 has in a transverse direction 144 perpendicular to the longitudinal direction 142 (and preferably essentially parallel to the main surfaces of the bipolar plate layers 122 and 124).
  • the transverse extent I of the elongated hole 140 in the transverse direction 144 is essentially the same size as or slightly larger than the diameter d of the support area 136 of the connecting element 130.
  • the largest diameter D of the undercut area 134 of the connecting element 130 is greater than the diameter d of the support area 136 and greater than the transverse extent I of the elongated hole 140, so that the undercut area 134 engages behind the bipolar plate layers 122 and 124 when the undercut area 134 passes through the passage opening 138 of the bipolar plate 108 has been pushed through, as shown in FIGS. 3 and 4.
  • the height h of the support area 136 that is to say its extension perpendicular to the main surfaces of the bipolar plate layers 122 and 124 and in the assembled state of the electrochemical device, preferably corresponds 100 - parallel to the stacking direction 102, essentially the total material thickness of both bipolar plate layers 122 and 124 in the area of the through openings 138, so that the undercut area 134, preferably essentially flat, on the rear side 146 facing away from the base body 132 of the seal 114 the second bipolar plate layer 124 and thus the bipolar plate 108 rests.
  • the seal 114 Due to the positive connection of the seal 114 to the bipolar plate 108 by means of the connecting element 130, the seal 114 is fixed in its position relative to the bipolar plate 108 along the transverse direction 144 of the elongated hole 140 of the bipolar plate 108; however, the relative position of the seal 114 with respect to the bipolar plate 108 in the longitudinal direction 142 of the elongated hole 140 is variable within the scope of the longitudinal extent L of the elongated hole 140, so that positioning and / or manufacturing tolerances can be compensated.
  • the demolding of the undercut area 134 from the second tool part (not shown) of the shaping tool 110 is made possible, for example, by deforming the undercut area 134 and / or by displaceable elements in the second tool part of the shaping tool 110.
  • the second tool part is preferably provided with a defined undercut.
  • the bipolar plate 108 After the seal 114 has been positively connected to the bipolar plate 108 by pushing the at least one connecting element 130 through the passage opening 138 of the bipolar plate 108 assigned to it, the bipolar plate 108 is moved away from the first tool part 126 of the forming tool 110, whereby the with the Bipolar plate 108 connected seal 114 and the ver with the seal 114 connected gas diffusion layer 112 from the first tool part 126 of the Shaping tool 110 are removed, so that the demolding of the unit 128 of gas diffusion layer 112 and seal 114 from the shaping tool 110 is completed.
  • a second embodiment of a connection between the seal 114 and the bipolar plate 108 shown in FIG. 5 differs from the first embodiment shown in FIGS. 2 to 4 in that the bipolar plate layers 122 and 124 are not flat in the area of the passage openings 138 , but rather form a collar 148 which at least partially surrounds the openings 138.
  • the two bipolar plate layers 122 and 124 each form a partial collar 150 and 152, respectively.
  • the collar 148 comprises only a part of the collar 150 of the first bipolar plate layer 122 or only a part of the collar 152 of the second bipolar plate layer 124, in which case the respective other bipolar plate layer 122 or 124 in the area of the passage opening 138 can be of essentially flat design .
  • a third embodiment shown in FIG. 6 differs from the first embodiment shown in FIGS. 1 to 4 in that the connecting element 130 does not have a mushroom shape, but rather the undercut area 134 of the connecting element 130 is teardrop-shaped.
  • the undercut area 134 preferably does not lie flat against the rear side 146 of the second bipolar plate layer 124, which enables a certain relative movement between the seal 114 and the bipolar plate 108 along the stacking direction 102.
  • This relative mobility can be used to compensate for positioning and / or manufacturing tolerances when assembling the electrochemical device 100.
  • the third embodiment shown in FIG. 6 agrees with regard to structure, function and method of manufacture with the first embodiment shown in FIGS. 1 to 4, reference is made to the above description.
  • the undercut region 134 can in principle also have any other shape, for example the shape of an arrowhead.
  • a fourth embodiment shown in FIG. 7 differs from the first embodiment shown in FIGS. 1 to 4 in that a pressing device 154 is provided on the first tool part 126 of the shaping tool 110, by means of which the area of the seal 114 on which the connecting element 130 is arranged, can be acted upon with a pressing force directed against the bipolar plate 108 in order to facilitate the establishment of a positive connection between the connecting element 130 and the passage opening 138 of the bipolar plate 108.
  • the pressing device 154 can comprise, for example, a pin 156, which is guided displaceably in a channel 158 of the first tool part 126 of the shaping tool 110 along a displacement direction 160 and is in contact with a rear side 162 of the seal 114 facing away from the bipolar plate 108, while the seal 114 is arranged on the first tool part 126 of the shaping tool 110. Furthermore, the establishment of a positive connection between the connecting element 130 and the passage opening 138 of the bipolar plate 108 can be facilitated by measures that reduce the friction between the log device 114 and the bipolar plate layer 122 and / or the bipolar plate layer 124 of the bipolar plate 108, for example a bevel and / or a deburring of the edge of the passage opening 138.
  • the fourth embodiment shown in FIG. 7 agrees with respect to Lich structure, function and method of manufacture with the first embodiment shown in FIGS. 1 to 4 Darge, reference is made to the above description in this respect.
  • a fifth embodiment shown in FIG. 8 differs from the first embodiment shown in FIGS. 1 to 4 in that the seal 114 is not connected to the bipolar plate 108 by a form fit, but by a material connection, in particular by means of a material connection element 164 which is arranged on the seal 114 or on the bipolar plate 108 before the seal 114 and bipolar plate 108 are brought together.
  • the material connection element 164 can for example contain an adhesive, a tacky resin and / or an adhesion promoter.
  • the bipolar plate 108 - as in the first embodiment - is moved away from the first tool part 126 of the forming tool 110, whereby the unit 128 of gas diffusion layer 112 and seal 114 is removed from the first tool part 126 of the forming tool 110 is demolded.
  • the fifth embodiment shown in FIG. 8 agrees with regard to structure, function and method of manufacture with the first embodiment shown in FIGS. 1 to 4, reference being made to the above description.
  • a sixth embodiment shown in FIG. 9 differs from the first embodiment shown in FIGS. 1 to 4 in that the bipolar plate 108 is used not only for demolding a single unit 128 composed of gas diffusion layer 112 and seal 114, but also for demolding a second unit 128 ′ made up of the second gas diffusion layer 118 and the second seal 120.
  • the second seal 120 after it has been produced in a molding tool, which may be identical to the molding tool 110 for producing the seal 114 or different from the molding tool 110 for producing the seal 114, in the same way (or in a different way ) are connected to the bipolar plate 108 like the seal 114 in order to demold the second seal 120 from a tool part of its forming tool.
  • the two units 128 and 128 'each consisting of a gas diffusion layer 112 or 118 and a seal 114 or 120 are then arranged on opposite sides of the bipolar plate 108, as can be seen from FIG.
  • each electrochemical unit 104 thus comprises an assembly 106 ', which includes the bipolar plate 108, the seal 114 produced separately from the bipolar plate 108 in the forming tool 110, the gas diffusion layer 112 on which the seal 114 is molded, which is also in a forming tool generated separately from the bipolar plate 108 second seal 120 and the second gas diffusion layer 118, on which the second seal 120 is molded, and an electrochemically active membrane 116.
  • the seal 114 and the second seal 120 can be connected to one another by (not illustrated) connecting means, preferably in a form-fitting manner.
  • Such connecting means can be formed in one piece with the seal 114 or in one piece with the second seal 120.
  • an electrochemically active membrane 116 can be inserted between each two such assemblies 106 ′ in order to form a stack of electrochemical units 104 in this way.
  • a seventh embodiment of a connection between the seal 114 and the bipolar plate 108, shown in FIG. 10, differs from the first embodiment shown in FIGS. 2 to 4 in that the connecting element 130 is not formed on the seal 114, but on the Bipolar plate 108, in particular on the first bipolar plate layer 122 facing the seal 114.
  • the bipolar plate layer 122 forms a collar 170 in the area of the passage opening 138 of the bipolar plate layer 122, which collar ends at a radially outwardly protruding annular collar 172 which forms an undercut area 134 of the connecting element 130.
  • the annular collar 172 engages behind an edge region 174 of the seal 114, which borders a narrower section 176 of a stepped passage opening 178 in the seal 114 facing the bipolar plate 108.
  • the annular collar 172 is arranged in a further section 180 of the stepped through opening 178 facing away from the bipolar plate 108.
  • the passage opening 178 of the seal 114 can be provided with a bevel 182.
  • a - preferably cylindrical - core 186 is arranged in a - preferably cylindrical - recess 184 in the first tool part 126, of which the A - preferably cylindrical - projection 190 protrudes towards the cavity of the shaping tool 110, which, when the shaping tool 110 is closed, engages in a complementary recess 192 in the second tool part 194 of the shaping tool 110.
  • the core 186 arranged in the first tool part 126 is surrounded by a movable sleeve 196. After the seal 114 has been produced in the molding tool 110 in an injection molding process, the molding tool 110 is opened by the first tool part 126 and the second tool part 194 being moved away from one another.
  • the holding device comprises a positioning element 200, for example a positioning pin 202, which engages in the collar 170 of the connecting element 130 from the side facing away from the seal 114.
  • the bipolar plate 108 can also be positioned relative to the seal 114 by means of one or more positioning elements arranged outside the cavity of the shaping tool 110.
  • the bipolar plate 108 can be held in its position relative to the first tool part 126 and the seal 114 by means of a suction gripper 204 of the holding device 198, for example.
  • An evacuable chamber open towards the bipolar plate 108 is arranged in the suction gripper 204, so that the bipolar plate 108 is pressed against the suction gripper 204 by the air pressure in the vicinity of the bipolar plate 108.
  • the movable sleeve 196 is moved towards the bipolar plate 108, so that the edge region 174 of the seal 114, which surrounds the stepped passage opening 178, is moved over the annular collar 172 of the connecting element 130 and engages behind the annular collar 172, so that the seal 114 and the bipolar plate 108 are connected to one another by a form fit by means of the connecting element 130.
  • the seventh embodiment shown in FIGS. 10 and 11 corresponds in terms of structure, function and method of manufacture to the first embodiment shown in FIGS. 1 to 4, reference being made to the above description.

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

Abstract

L'invention vise à mettre en œuvre un procédé destiné à produire un joint pour une unité électrochimique d'un dispositif électrochimique dont les étapes consistent : à créer le joint dans un outil de formage ; et à retirer le joint de l'outil de formage. Ledit procédé permet de retirer le joint facilement sans l'endommager de l'outil de formage et de préférence de parvenir à un positionnement précis du joint par rapport à d'autres composants de l'unité électrochimique. Selon l'invention, le joint, lorsqu'il est encore situé sur l'outil de formage, est relié à au moins une couche de plaque bipolaire d'une plaque bipolaire de l'unité électrochimique et la ou les couches de plaque bipolaire sont retirées de l'outil de formage en même temps que le joint qui est relié à ces couches.
PCT/EP2020/085112 2019-12-19 2020-12-08 Procédé destiné à produire un joint pour une unité électrochimique d'un dispositif électrochimique et ensemble pour un dispositif électrochimique WO2021122169A1 (fr)

Applications Claiming Priority (2)

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DE102019135277.0A DE102019135277A1 (de) 2019-12-19 2019-12-19 Verfahren zum Herstellen einer Dichtung für eine elektrochemische Einheit einer elektrochemischen Vorrichtung und Baugruppe für eine elektrochemische Vorrichtung
DE102019135277.0 2019-12-19

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DE102020130343A1 (de) 2020-11-17 2022-05-19 Ekpo Fuel Cell Technologies Gmbh Baugruppe für eine elektrochemisch aktive Einheit, elektrochemisch aktive Einheit und Verfahren zur Herstellung einer Baugruppe für eine elektrochemisch aktive Einheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1622217A2 (fr) * 2004-07-29 2006-02-01 Tokai Rubber Industries, Ltd. Pile à combustible à électrolyte polymérique solide
DE102007003096A1 (de) * 2007-01-16 2008-07-17 Carl Freudenberg Kg Dichtungsanordnung für ein Plattenelement einer Brennstoffzelle
DE102013220486A1 (de) * 2012-10-12 2014-04-17 Elringklinger Ag Verfahren zum Herstellen einer mehrteiligen Bipolarplatte für eine elektrochemische Vorrichtung und Bipolarplatte für eine elektrochemische Vorrichtung

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Publication number Priority date Publication date Assignee Title
KR101301757B1 (ko) * 2010-12-24 2013-08-29 평화오일씰공업주식회사 연료전지 가스켓용 사출금형
CN108110278A (zh) * 2017-12-22 2018-06-01 重庆宗申氢能源动力科技有限公司 一种燃料电池双极板密封方法及密封固化模具

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1622217A2 (fr) * 2004-07-29 2006-02-01 Tokai Rubber Industries, Ltd. Pile à combustible à électrolyte polymérique solide
DE102007003096A1 (de) * 2007-01-16 2008-07-17 Carl Freudenberg Kg Dichtungsanordnung für ein Plattenelement einer Brennstoffzelle
DE102013220486A1 (de) * 2012-10-12 2014-04-17 Elringklinger Ag Verfahren zum Herstellen einer mehrteiligen Bipolarplatte für eine elektrochemische Vorrichtung und Bipolarplatte für eine elektrochemische Vorrichtung

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