WO2021122164A1 - Dispositif électrochimique et procédé de fabrication d'un élément d'étanchéité pour une unité électrochimique d'un dispositif électrochimique - Google Patents

Dispositif électrochimique et procédé de fabrication d'un élément d'étanchéité pour une unité électrochimique d'un dispositif électrochimique Download PDF

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Publication number
WO2021122164A1
WO2021122164A1 PCT/EP2020/085092 EP2020085092W WO2021122164A1 WO 2021122164 A1 WO2021122164 A1 WO 2021122164A1 EP 2020085092 W EP2020085092 W EP 2020085092W WO 2021122164 A1 WO2021122164 A1 WO 2021122164A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
electrochemical device
elastomer part
sealing element
electrochemical
Prior art date
Application number
PCT/EP2020/085092
Other languages
German (de)
English (en)
Inventor
Kathrin KULLEN
Wolfgang Fritz
Dennis Dollinger
Oliver Fink
Thomas DIX-LANDGRAF
Paul Volz
Manuel SALZMANN
Andreas Schmid
Jürgen KRAFT
Manuel Morcos
Stefan Dwenger
Carsten Horn
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
Priority claimed from DE102019135292.4A external-priority patent/DE102019135292A1/de
Priority claimed from DE102020120293.8A external-priority patent/DE102020120293A1/de
Application filed by Elringklinger Ag filed Critical Elringklinger Ag
Priority to EP20821196.1A priority Critical patent/EP4077767A1/fr
Priority to CN202080083796.5A priority patent/CN115053020A/zh
Publication of WO2021122164A1 publication Critical patent/WO2021122164A1/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
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • 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
    • C25B9/75—Assemblies comprising two or more cells of the filter-press type having bipolar electrodes
    • 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
    • H01M8/24—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
    • H01M8/02—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
    • 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 a plurality of electrochemical units following one another along a stacking direction, each of the electrochemical units each having a membrane, a first gas diffusion layer, a second gas diffusion layer, a first sealing element connected to the first gas diffusion layer and a material connection the second gas diffusion layer connected two th sealing element and a bipolar plate.
  • SoGDL Seal on Gas Diffusion Layer
  • the sealing element can be molded directly onto the gas diffusion layer, in particular in an injection molding process.
  • the sealing system formed by the first sealing elements and the second sealing elements serves in particular to seal the flow fields of the electrochemical device from the media channels of the electrochemical device and from the environment and / or to seal the media channels of the electrochemical device from one another and from the environment.
  • both the sealing element formed from an elastomer material and the gas diffusion layer are very unstable and not dimensionally stable components, the assembly formed from these components is also quite unstable and not very dimensionally stable.
  • a SoGDL seal therefore has a high level of waviness and poor dimensional accuracy. Due to its low dimensional stability, it is at the Assembly of the electrochemical device is difficult to handle, and the assembly process of the electrochemical device is difficult to automate.
  • the present invention is based on the object of providing an electrochemical device of the type mentioned, the sealing elements of which can be easily manufactured and precisely positioned relative to the other components of the electrochemical device and can be assembled with the other components of the electrochemical device.
  • one of the sealing elements is designed as a frame sealing element which comprises an elastomer part and a frame, the frame being formed from a material which has a higher form stability than the elastomer material from which the elastomer part is formed.
  • the present invention is based on the concept of stabilizing an assembly consisting of a sealing element and the gas diffusion layer, with which the relevant sealing element is cohesively connected, by integrating a dimensionally stable frame into the relevant sealing element, preferably surrounding the relevant sealing element.
  • the dimensionally stable frame improves the manageability of the assembly consisting of the sealing element and the gas diffusion layer with which the sealing element is materially connected.
  • the sealing element in question has greater dimensional accuracy in the XY plane aligned perpendicular to the stacking direction of the electrochemical device.
  • a ripple of the gas diffusion layer and / or of the sealing element which is integrally connected to the gas diffusion layer in the Z direction (parallel to the stacking direction of the electrochemical device) is reduced or avoided entirely.
  • a dimensionally stable assembly is generated which comprises a gas diffusion layer and a SoGDL seal, this assembly having significantly improved properties with regard to its dimensional stability and its manageability.
  • the frame is cohesively and / or positively connected to the elastomer part.
  • the frame is not directly connected to the gas diffusion layer with which the elastomer part is connected in a materially bonded manner.
  • the frame is connected directly to the gas diffusion layer, preferably below the sealing lips of the sealing element, especially when the frame and the elastomer part of the sealing element are manufactured in a two-component injection molding process.
  • the frame preferably comprises a frame contact area on which the frame is connected to the elastomer part in a materially and / or form-fitting manner, the elastomer part having an upper elastomer part contact area which is arranged in the stacking direction above the frame contact area and / or a lower elastomeric part contact area disposed below the frame contact area in the stacking direction.
  • top and “bottom” relate exclusively to the Orientie tion of the elements with respect to the stacking direction of the electrochemical device, which does not have to be vertically aligned, but can assume any position relative to the vertical.
  • the upper elastomer part contact area and / or the lower elastomer part contact area achieve an improved connection of the elastomer part to the frame, in particular in the case of chemical and / or mechanical connection.
  • the elastomer part contact areas which engage behind the frame contact area - viewed in the stacking direction of the electrochemical device - can produce a form-fitting connection between the elastomer part and the frame in the stacking direction.
  • the upper elastomer part contact area and / or the lower elastomer part contact area are preferably arranged on a frame contact area of the frame, which has a smaller thickness, that is to say a smaller extension along the stacking direction of the electrochemical device, than a frame contact area Contact area of adjoining frame base body which is not in contact with the upper elastomer part contact area or with the lower elastomer part contact area.
  • the elastomer part comprises at least one elastomer part undercut area, softer a region of the The frame engages behind, and / or when the frame comprises at least one frame undercut area which partially engages behind an area of the elastomer.
  • Reaching behind preferably relates to an undercut direction which is oriented perpendicular to the stacking direction of the electrochemical device.
  • the frame has at least one passage opening through which the elastomer part extends.
  • the frame comprises at least one recess which opens at an opening on an elastomer part-side edge of the frame, the recess comprising a constriction adjacent to the opening and an enlarged area which is connected to the opening via the constriction .
  • Such a recess can in particular - viewed in the stacking direction of the electrochemical device - have essentially the shape of a keyhole.
  • the recess is preferably at least partially, in particular essentially completely, filled with the elastomer material of the elastomer part.
  • the frame of the frame sealing element is an electrochemical unit has at least one positioning element which is in engagement with a positioning opening of a frame sealing element of an adjacent electrochemical unit.
  • the positioning opening is formed in the elastomer part of the frame sealing element and is undersized in relation to the positioning element before the assembly of the electrochemical device.
  • the positioning element is essentially cylindrical and the positioning opening is essentially circular, the diameter of the positioning opening before the assembly of the electrochemical device being smaller than the outer diameter of the positioning element, preferably by at least 0.1 mm smaller, particularly preferably at least 0.2 mm smaller.
  • the frame comprises at least one positioning element which is in engagement with a positioning opening of a bipolar plate adjacent to the frame.
  • the frame has at least one handling passage opening which is not or at least not completely filled with elastomer material.
  • a positioning element of a handling device for example a robot, can engage in such a handling passage opening during the assembly of the electrochemical device in order to position the frame sealing element relative to other components of the electrochemical device.
  • the frame has a ventilation area which is filled with elastomer material of the elastomer part, which contains or can contain air bubbles.
  • a cavity of a shaping tool in which the frame sealing element is produced by an injection molding process can be vented via such a venting area while the cavity is being filled with the elastomer material of the elastomer part.
  • vent area of the frame When the vent area of the frame is filled during the injection molding process, the air bubbles form, which do not impair the function of the frame sealing element, however, since the vent area is preferably arranged outside the medium duct sealing areas and the flow field sealing area of the frame sealing element.
  • the vent area of the frame therefore does not have to be separated after the frame sealing element has been produced in an injection molding process, but can remain on the frame sealing element which is used to assemble the electrochemical unit and the electrochemical device as a whole.
  • the frame In an entry area of the venting area through which the elastomer material penetrates into the venting area during the injection molding process, the frame preferably has a smaller thickness, i.e. a smaller expansion along the stacking direction of the electrochemical device, than in the areas of the frame adjoining the entry area .
  • the thickness of the frame increases in the venting area, preferably up to one end area or up to several, for example two, end areas of the venting area.
  • This increase in the thickness of the frame from the entry area to the end area or to the end areas of the vent area preferably takes place essentially continuously.
  • the frame is formed in one piece and extends ringför mig closed along the entire circumference of the frame sealing element.
  • the frame of the frame sealing element is not formed in one piece, but rather comprises two or more separate frame parts and has at least one gap along its circumference that separates two frame parts of the frame from one another.
  • the frame has at least two, in particular at least three, particularly preferably at least four, gaps along its circumference, each of which separates two frame parts of the frame from one another.
  • At least one of the gaps, preferably each gap, of the frame is filled with the elastomer material of the elastomer part.
  • Such a gap can serve as an expansion joint in order to effect a tolerance compensation due to different coefficients of thermal expansion of the material of the frame and the material of the elastomer part.
  • the components of a further electrochemical unit adjacent to an electrochemical unit of the electrochemical device are identical to the components of the electrochemical unit, but at an angle of 180 ° around a central axis of rotation parallel to the stacking direction are mounted rotated to each other in the stack.
  • the components of a further electrochemical unit adjacent to an electrochemical unit of the electrochemical device are not only identical to one another, but are also mounted in the same orientation in the stack of the electrochemical device, i.e. in particular without twisting around an angle of 180 ° around a central axis of rotation running parallel to the stacking direction.
  • the present invention also relates to a method for producing a sealing element for an electrochemical unit of an electrochemical device, which comprises several electrochemical units following one another along a stacking direction, the electrochemical units each comprising a membrane, a first gas diffusion layer, a second gas diffusion layer and a bipolar plate .
  • the present invention is based on the further object of providing such a method for producing a sealing element for an electrochemical unit of an electrochemical device, which makes it possible to to position the sealing element produced by the method in a simple and precise manner relative to other components of the electrochemical device during the assembly of the electrochemical device.
  • this object is achieved by a method which comprises the following:
  • an elastomer part which is materially connected to the gas diffusion layer and materially and / or positively connected to the frame, through an injection molding process in the forming tool; wherein the frame is formed from a material which has a higher form stability than the elastomer material from which the elastomer part is formed.
  • the frame can be introduced into the forming tool as a separately manufactured insert, the elastomer part then being produced by molding the elastomer material onto the frame and onto the gas diffusion layer.
  • the material for the frame can comprise a thermoplastic material.
  • the material used for the frame can be a material which, preferably in addition to a thermoplastic material, contains glass fibers.
  • the glass fibers are contained in the material of the frame in a proportion of preferably at least 10 percent by weight, in particular at least 20 percent by weight, particularly preferably at least 30 percent by weight, and / or preferably at most 50 percent by weight.
  • a material with the designation PPS GF40 which contains a polyphenylene sulfide material with an addition of 40 percent by weight of glass fibers, can be used as the material for the frame.
  • a material with the designation PPA GF35 can be used for the frame, for example, which contains a polyphthalamide with an addition of 35 weight percent glass fibers.
  • a printed circuit board material can be used as the material for the frame, in particular a hard paper.
  • a flame-retardant printed circuit board base material can be used as the material for the frame.
  • the printed circuit board base material FR2 which comprises a paper and phenolic resin, can be used.
  • circuit board base material FR3 can be used, which comprises a core made of epoxy resin and paper.
  • the printed circuit board base material FR4 which comprises epoxy resin and a glass fiber cloth
  • the frame sealing element can also be produced in a multi-component injection molding process, in particular in a two-component injection molding process, the process comprising the following:
  • the gas diffusion layer with the desired outer contour is separated from a strip-shaped starting material, for example cut out or punched out, and placed in a shaping tool.
  • the starting material can for example be a rollable roll material.
  • the frame is manufactured from a dimensionally stable material in an injection molding process in the molding tool.
  • the elastomer part is then generated in the shaping tool in an injection molding process.
  • the elastomer part can be injected onto the gas diffusion layer and onto the frame at the same time.
  • a plastic material for example a thermoplastic material, which contains glass fibers, can be used as the material for the frame.
  • the glass fibers are contained in the material of the frame in a proportion of preferably at least 10 percent by weight, in particular at least 20 percent by weight, particularly preferably at least 30 percent by weight, and / or preferably at most 50 percent by weight.
  • the material with the designation PBTP GF30 can be used, which contains polybutylene teraphthalate, to which glass fibers are added in a weight proportion of 30 percent by weight.
  • the material with the designation PPS GF40 can be used, which contains a polyphenylene sulfide to which glass fibers are added in a weight proportion of 40 percent by weight.
  • the material with the designation PPA GF35 can be used, which contains a polyphthalamide to which glass fibers are added in a weight proportion of 35 percent by weight.
  • the frame can in particular comprise a metallic material and preferably be formed essentially entirely from a metallic material.
  • Such a frame which is formed entirely or partially from a metallic material, is preferably essentially completely embedded in the elastomer material of the elastomer part during the injection molding process, preferably by essentially completely encapsulating the frame with the elastomer material.
  • Such a frame which contains a metallic material, can, for example, be cut out, in particular punched out, from a sheet-like starting material.
  • such a frame which contains a me-metallic material, is bent from a wire, in particular from a flat wire or from a profile wire.
  • the frame can have a ventilation area, via which a cavity of the shaping tool is vented while the cavity is being filled with the elastomer material of the elastomer part.
  • the frame of the frame sealing element can in particular be connected at the end to the elastomer part of the frame sealing element, the end of the frame preferably being oriented essentially parallel to the stacking direction of the electrochemical device.
  • the frame can be connected to the elastomer part in such a way that an area of the frame engages behind the elastomer part and / or an area of the elastomer part engages behind the frame.
  • the frame can be connected to the elastomer part, for example, in that the frame has one or more holes through which the elastomer part extends.
  • connection of the frame to the elastomer part can also take place via webs, so that areas of the frame or of the elastomer part arranged between the webs are not directly connected to one another.
  • the webs can be formed in one piece with the elastomer part or in one piece with the frame.
  • a contact surface of the frame that is in contact with the elastomer part can be structured in such a way that the production of a mechanical and / or chemical connection between the elastomer part and the frame is facilitated.
  • the contact surface of the frame can be roughened and / or have projections and / or depressions.
  • the frame can have holes and / or recesses into which the elastomer part penetrates in order to form a form fit between the elastomer part and the frame.
  • the number of these holes and / or recesses and the spacing of these holes or recesses from one another in the circumferential direction of the frame is selected so that a sufficiently stable connection between the elastomer part and the frame is ensured.
  • such holes and / or recesses are arranged in areas of the frame sealing element in which mechanical stresses are to be expected due to a higher degree of shrinkage of the elastomer part and / or due to different thermal expansion coefficients of the material of the frame and the material of the elastomer part.
  • the frame preferably has at least two, in particular at least four, particularly preferably at least six, for example at least eight, holes through which the elastomer part extends.
  • the frame has at least ten, preferably at least twenty, in particular at least twenty-five recesses into which the elastomer part extends in order to form a form fit with the frame.
  • At least one of the holes in the frame and / or at least one of the recesses in the frame can have the shape of a keyhole.
  • the frame is not connected directly to the gas diffusion layer to which the elastomer part is connected in a materially bonded manner.
  • the frame is connected directly to the gas diffusion layer with which the elastomer part of the frame sealing element is connected in a materially bonded manner.
  • the elastomer part is preferably produced by an injection molding process in which the elastomer material of the elastomer part infiltrates a region of the gas diffusion layer.
  • the frame can additionally be molded onto a hard stop on the outside in order to lengthen the air and creepage distance between the bipolar plates of the electrochemical device.
  • the frame can be used as part of the hard stop or in place of the hard stop.
  • the frame can protrude over the bipolar plate of the respective electrochemical unit in a direction perpendicular to the stacking direction of the electrochemical device. As a result, good electrical insulation is achieved between the bipolar plates that follow one another in the stacking direction.
  • the frame can serve as a stop for the stack of electrochemical units on a housing of the electrochemical device when the electrochemical device is exposed to high acceleration in the event of a collision (in particular when the electrochemical device is used in an automobile).
  • the frame can serve as a protection against contact for the bipolar plates.
  • the positioning opening into which the positioning element arranged on the frame engages can be designed as an elongated hole.
  • Such an elongated hole can be provided in the context of a frame sealing element of a neighboring electrochemical unit or in a bipolar plate adjacent to the frame.
  • the frame can be centered relative to an adjacent bipolar plate if the frame has a projection protruding towards the bipolar plate and the bipolar plate has a cup which receives the projection.
  • the well can for example be embossed in one or more bipolar plate layers of the bipolar plate.
  • the frame of a frame sealing element of an electrochemical unit's relative to the frame of a frame sealing element of a neighboring electrochemical unit can be centered when the frame has a projection and the frame of the frame sealing element of the neighboring electrochemical unit has a recess for receiving the Has before jump of the frame.
  • the frame can be stepped, with an outer frame area facing away from the elastomer part being offset along the stacking direction of the electrochemical device relative to an inner frame area facing the elastomer part. Due to the step arising between the outer frame area and the inner frame area, each stepped frame can be centered on an adjacent stepped frame in the stacking direction. In addition, the stepped design of the frame increases the rigidity of the frame and / or provides better protection against contact for the bipolar plates that are covered on the outside by the frame.
  • an outer frame area facing away from the elastomer part encloses an obtuse angle with an inner frame area facing the elastomer part.
  • This increases the rigidity of the frame and / or improves the protection against contact for the bipolar plates of the electrochemical device, which are covered on the outside by the frame.
  • the outer frame area can be connected to the inner frame area via a curved area of the frame.
  • the obtuse angle a which the outer frame area encloses with the inner frame area is preferably greater than 100 °, in particular greater than 110 °.
  • the obtuse angle a which the outer frame area encloses with the inner frame area, is preferably smaller than 160 °, in particular smaller than 150 °.
  • the frame can be designed as an insert which is at least partially, preferably completely, embedded in the elastomer material of the elastomer part.
  • the insert part can be formed from a metallic material.
  • the frame can be provided with passage openings which make it possible to hang the frame sealing element after the injection molding process during a tempering process.
  • Such a passage opening can in particular be formed on an outwardly protruding tab of the frame away from the elastomer part of the frame sealing element.
  • the bipolar plate of at least one electrochemical unit of the electrochemical device can have a contacting tab on which the relevant bipolar plate can be contacted for a voltage tap.
  • Such a contact tab of the bipolar plate is preferably supported on the frame of an adjacent frame sealing element in order to achieve the most precise possible alignment of the contact tab by the support on the frame.
  • An outer contour of the frame can form a corner which can serve as a stop for a stacking aid, as a stacking edge and / or as a measuring edge for detecting the position of the frame sealing element.
  • the frames of two frame sealing elements following one another along the stacking direction of the electrochemical device can be designed so that they can be interlocked with one another.
  • the frame of a frame sealing element can be provided with a sealing lip, preferably made of an elastomer material, in order to close a gap between two frames of frame sealing elements of adjacent one another along the stacking direction of the electrochemical device To bridge electrochemical units, so that a medium is prevented from escaping from the electrochemical device and contamination of the electrochemical device by media penetrating from the outside is prevented.
  • the sealing lip is spaced from the elastomer part of the frame sealing element, preferably in a direction perpendicular to the stacking direction.
  • the sealing lip is preferably arranged between the elastomer part of the frame sealing element and an outer edge of the frame of the frame sealing element.
  • Fig. 1 is a plan view from above of an arrangement of several electrochemical units, which each have a membrane, a first gas diffusion layer, a second gas diffusion layer, a cohesively connected to the first gas diffusion layer first sealing element, a cohesively connected to the second gas diffusion layer second sealing element and a multilayer bipolar plate include;
  • FIG. 2 is a cross-section, taken parallel to the stacking direction, through the arrangement from Fig. 1 in the area of a flow field sealing device, along the line 2-2 in Fig. 1;
  • FIG. 3 shows an enlarged illustration of the area I from FIG. 1;
  • FIG. 4 shows a cross section through the arrangement from FIG. 3 in the area of a medium channel seal, along the line 4-4 in FIG. 3;
  • FIG. 5 shows an enlarged illustration of area II from FIG. 1;
  • FIG. 6 shows a cross section through the arrangement from FIG. 5 in the area of a coupling device, by means of which the second sealing element is mechanically coupled with a dimensionally stable frame of the first sealing element and with a bipolar plate, along the line 6-6 in FIG. 5;
  • FIG. 7 shows a further enlarged illustration of area II from FIG. 1;
  • FIG. 8 shows a cross section through the arrangement from FIG. 7 in the area of a coupling device, by means of which a frame of a first sealing element of an electrochemical unit is coupled to an elastomer part of a first sealing element of an adjacent electrochemical unit, along the line 8-8 in FIG. 7 ;
  • FIG. 9 shows an enlarged illustration of the area III from FIG. 1; FIG.
  • FIG. 10 shows a cross section through the arrangement from FIG. 9 in the area of a medium channel seal, along the line 10-10 in FIG. 9;
  • FIG. 11 shows an enlarged illustration of the area IV from FIG. 1;
  • FIG. FIG. 12 shows a cross section through the arrangement from FIG. 11 in the area of a coupling device, by means of which the frame of a first sealing element of an electrochemical unit is coupled to an elastomer part of the first sealing element of an adjacent electrochemical unit;
  • FIG. 11 shows an enlarged illustration of the area IV from FIG. 1;
  • FIG. FIG. 12 shows a cross section through the arrangement from FIG. 11 in the area of a coupling device, by means of which the frame of a first sealing element of an electrochemical unit is coupled to an elastomer part of the first sealing element of an adjacent electrochemical unit;
  • FIG. 13 shows an enlarged illustration of the area V from FIG. 12;
  • FIG. 14 is a top plan view of the frame of the first sealing element of one of the electrochemical units of the arrangement from FIG. 1;
  • FIG. 15 shows an enlarged illustration of the region VI from FIG. 14;
  • FIG. 16 shows an enlarged illustration of the region VII from FIG. 14;
  • FIG. 17 shows a plan view of a cathode-side bipolar plate layer of the bipolar plate of one of the electrochemical units from FIG. 1;
  • FIG. 18 shows a plan view of a bipolar plate layer on the anode side of the bipolar plate of one of the electrochemical units of the arrangement from FIG. 1;
  • FIG. 19 shows a plan view of the elastomer part of the first sealing element of one of the electrochemical units of the arrangement from FIG. 1;
  • FIG. 20 shows a plan view of the second sealing element of one of the electrochemical units of the arrangement from FIG. 1, this second sealing element comprising only one elastomer part;
  • FIG. 21 shows a top view of the first sealing element of one of the electrochemical units of the arrangement from FIG. 1, the first sealing element comprising an elastomer part and a dimensionally stable frame;
  • FIG. 22 shows an enlarged illustration of the region VIII from FIG. 21;
  • FIG. 23 shows a cross section through the first sealing element from FIGS. 21 and 22 in a ventilation region of the frame
  • FIG. 24 shows an enlarged illustration of the region IX from FIG. 21;
  • FIG. 25 shows a cross section through the first sealing element from FIG. 24 in the area of a flow field seal, along the line 25-25 in FIG. 24;
  • FIG. 26 shows a cross section through the first sealing element from FIG. 24 in the area of a coupling opening in the elastomer part of the first sealing element, along the line 26-26 in FIG. 24;
  • FIG. 27 shows a cross section through the first sealing element from FIG. 24 in
  • 28 shows a cross section corresponding to FIG. 13 through a second embodiment of an arrangement of a plurality of electrochemical units in the area of a coupling device by which the frame of the first sealing element of an electrochemical unit is coupled to an adjacent bipolar plate;
  • 29 shows a plan view of a section of a first sealing element of an electrochemical unit in a third embodiment in which the frame of the first sealing element is formed in several parts and has at least one gap along its circumference which separates two frame parts of the frame from one another;
  • FIG. 30 shows a cross section, taken parallel to the stacking direction, through an arrangement of several electrochemical units in a fourth embodiment of the electrochemical device, in which the frame of the frame sealing element is stepped, along the line 30-30 in FIG. 1;
  • the frame of the frame sealing element is designed as a metallic insert embedded in the elastomer material of the elastomer part, which includes an outer frame area and an inner frame area, the outer The frame area is connected to the inner frame area via a curved area and forms an obtuse angle with the inner frame area;
  • FIGS. 30 and 31 show a cross section corresponding to FIGS. 30 and 31 through a sixth embodiment of the electrochemical device, in which the frame is provided with a sealing lip which is spaced from the elastomer part and between the elastomer part and an outer edge of the frame of the frame sealing element is arranged;
  • 33 shows a partial plan view from above of the frame of a frame sealing element in a variant of the first embodiment of an electrochemical device, in which a recess provided on the frame is designed as a passage opening with a closed edge;
  • FIG. 34 shows a cross section corresponding to FIG. 6 through a seventh one
  • Embodiment of the electrochemical device in which the components of electrochemical units adjacent to one another in the stacking direction of the electrochemical device's device are identical to one another and are mounted in the stack without being rotated by an angle of 180 ° around a central axis of rotation running parallel to the stacking direction, i.e. with an identical orientation are.
  • An electrochemical device designated as a whole by 100 for example a fuel cell device or an electrolyser, comprises a stack 102, which contains several electrochemical units 106 successive in a stacking direction 104, for example fuel cell units or electrolysis units, and a clamping device (not shown) for opening the electrochemical Units 106 with a direction along the stacking direction 104 tensioning force comprises.
  • each electrochemical unit 106 of the electrochemical device 100 comprises a first gas diffusion layer 108, a second gas diffusion layer 110, a membrane 112 arranged between the gas diffusion layers 108 and 110, in particular a catalyst-coated membrane ( CCM), a material bond with the first First sealing element 114 connected to the gas diffusion layer 108, a second sealing element 116 connected to the second gas diffusion layer 110 in a materially bonded manner, and a bipolar plate 118.
  • CCM catalyst-coated membrane
  • the bipolar plate 118 is formed, for example, from a metallic material or from an electrically conductive plastic material.
  • each bipolar plate 118 comprises a first bipolar plate layer 120, which faces the first gas diffusion layer 108 of the respective electrochemical unit 106, and a second bipolar plate layer 122 which faces away from the first gas diffusion layer 108 of the respective electrochemical unit 106 and the second gas diffusion Sion layer 110 facing an adjacent electrochemical unit 106 '.
  • each bipolar plate 118 is materially bonded, in particular by welding, for example by laser welding, fixed to one another in a fluid-tight manner.
  • the first bipolar plate layer 120 is shown individually in FIG. 18.
  • the second bipolar plate layer 122 is shown individually in FIG.
  • the second bipolar plate 122 On its outer circumference, the second bipolar plate 122 is provided with at least one contacting tab 121, on which the bipolar plate 118 can be contacted with a voltage tap element (not shown).
  • the second bipolar plate layer 122 is provided on its outer circumference with at least one stacking edge 123, on which during a Assembliervorgangs the electrochemical device 100 can attack a (not shown) stacking aid in order to precisely align the components of the stack 102.
  • the contacting tab 121 and / or the stacking edge 123 can also be arranged on the first bipolar plate layer 120.
  • the first sealing element 114 is shown individually in FIG. 21.
  • the second sealing element 116 is shown individually in FIG. 20.
  • the first gas diffusion layer 108 can be, for example, an anode-side gas diffusion layer of the electrochemical unit 106.
  • the second gas diffusion layer 110 can be, for example, a cathode-side gas diffusion layer of the electrochemical unit 106.
  • the anode side and cathode side of the electrochemical unit 106 can also be interchanged so that the first gas diffusion layer 108 is then the cathode-side gas diffusion layer and the second gas diffusion layer 110 is the anode-side gas diffusion layer.
  • the components of the adjacent electrochemical unit 106 ′ are preferably identical to the components of the electrochemical unit 106, but mounted in the stack 102 rotated by an angle of 180 ° about a central axis of rotation running parallel to the stacking direction 104.
  • the first sealing element 114 is designed as a frame sealing element 124, which comprises an elastomer part 126 shown individually in FIG. 19 and a frame 128 shown individually in FIG. 14.
  • the elastomer part 126 is formed from an elastomer material, for example from a silicone material.
  • the frame 128 is formed from a material that has a higher Formstabili ity than the elastomer material from which the elastomer part 126 is formed.
  • a material with the designation PPS GF40 can be used as the material for the frame 128, which contains a polyphenylene sulfide material with an addition of glass fibers in a proportion of 40 percent by weight of glass fibers.
  • a material with the designation PPA GF35 can be used as material for the frame 128, which contains a polyphthalamide material with an addition of glass fibers in a proportion of 35 percent by weight of glass fibers.
  • a printed circuit board material can be used as the material for the frame 128, in particular a hard paper.
  • a flame-retardant printed circuit board base material for example the printed circuit board base material with the designation FR2, FR3 or FR4 ("FR" stands for "flame retardant”), can be used as the material for the frame 128.
  • the FR2 circuit board base material comprises standard quality paper and phenolic resin.
  • the circuit board base material FR3 comprises a core made of epoxy resin and paper.
  • the circuit board base material FR4 comprises an epoxy resin and a fiberglass fabric.
  • the first sealing element 114 can be produced by an injection molding process, the process comprising:
  • the first sealing element 114 can also be produced in a multi-component injection molding process, in particular in a two-component injection molding process, the process comprising the following:
  • the frame 128 is produced by an injection molding process in the forming tool, the frame 128 being made, for example, of a polybutylene teraphthalate (PBTP) from the material with the designation PPS GF40 (polyphenylene sulfide with an addition of glass fibers in a proportion of 40 percent by weight glass fibers ) or from the Material with the designation PPA GF35 (polyphthalamide with an addition of glass fibers in a proportion of 35 weight percent glass fibers) is formed;
  • PBTP polybutylene teraphthalate
  • the elastomer part 126 which is materially connected to the first gas diffusion layer and materially connected to the frame 128, is produced by a second injection molding process in the molding tool.
  • Each bipolar plate layer 120, 122 and the elastomer part 126 of the frame sealing element 124 each has a plurality of medium passage openings 130 through which a fluid medium to be supplied 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 respective bipolar plate layer 120, 122 or through the elastomer part 126 of the frame sealing element 124.
  • a fluid medium to be supplied to the electrochemical device 100 in the case of a fuel cell device, for example, a fuel gas, an oxidizing agent or a coolant
  • Each medium channel 132 through which a fluid medium can be fed to the electrochemical device 100 is assigned at least one other medium channel 132 through which the fluid medium in question can be discharged from the electrochemical device 100.
  • the medium can flow from the first medium channel 132 transversely, preferably essentially perpendicularly, to the stacking direction 104 to the respectively assigned second medium channel 132.
  • Figs. 1, 17, 18 and 19 for example, two medium channels 134 for an oxidizing agent of the electrochemical device 100, two Mediumka channels 136 for a coolant of the electrochemical device 100 and two medium channels 138 for a fuel gas or a residual fuel gas of the electrochemical rule Device 100 shown.
  • each medium channel 132 is in fluid connection with a respective assigned flow field through a respective flow port 140.
  • the elastomer part 126 of the first sealing element 114 comprises a flow field sealing region 142, which extends around a flow field, for example around the flow field for the fuel gas, and one or more, in the illustrated embodiment comprises two sealing lips 144 which abut the first bipolar plate layer 120 of the bipolar plate 118 in a fluid-tight manner, without being firmly attached to the same.
  • the elastomer part 126 of the first sealing element 114 comprises several medium duct sealing areas 146, which each extend around a medium duct 132 and on the first bipolar plate layer 120 of the bipolar plate 118 the same electrochemical unit 106 and on the second bipolar plate layer 122 of the bipolar plate 118 of an adjacent electrochemical unit 106 'in a fluid-tight manner, without being fixed to these bipolar plate layers 120 or 122, respectively.
  • the medium channel sealing area 146 preferably has one or more sealing lips 148 with which the elastomer part 126 rests on the first bipolar plate layer 120.
  • the medium channel sealing area 146 preferably comprises one or more sealing lips 150 with which the elastomer part 126 rests against the second bi-polar plate layer 122 of the adjacent electrochemical unit 106.
  • the second sealing element 116 comprises, as shown for example in FIGS.
  • a flow field sealing region 152 which extends around a flow field of the electrochemical unit 106, for example around the flow field for oxidizing agent.
  • the flow field sealing area 152 of the second sealing element 116 preferably comprises one or more sealing lips 154 with which the second sealing element 116 rests in a fluid-tight manner on a second bipolar plate layer 122 of an adjacent electrochemical unit without being attached to the bipolar plate layer 122.
  • the flow field sealing area 152 of the second sealing element 116 and the flow field sealing area 142 of the first sealing element 114 with their preferably substantially flat contact surfaces 156a and 156b facing one another are in fluid-tight contact without being attached to one another.
  • the frame 128 of the first sealing element 114 is not directly connected to the first gas diffusion layer 108, with which the elastomer part 126 of the first sealing element 114 is firmly connected.
  • the frame 128, however, comprises a frame contact area 158, on wel chem the frame 128 is integrally connected to the elastomer part 126 (see in particular FIGS. 2 and 4).
  • the frame 128 is designed to be flattened in the frame contact area 158 for improved connection of the elastomer part 126 to the frame 128; the extension of the frame 128 along the stacking direction 104 is thus less in the frame contact area 158 than in the frame base body 160 adjoining the frame contact area 158.
  • the elastomer part 126 comprises an upper elastomer part contact area 162 which is arranged above the frame contact area 158 in the stacking direction 104, and a lower elastomer part contact area 164 which is arranged in the stacking direction 104 below the frame contact area 158.
  • the elastomer part 126 comprises at least one, preferably several, elastomer part undercut areas 166, each of which engages behind an area of the frame 128 (see in an undercut direction 168 perpendicular to the stacking direction 104) .
  • the frame 128 comprises at least one, preferably several, frame undercut areas 170, each of which engages behind an area of the elastomer part 126.
  • the frame 128 can in particular have at least one passage opening 172 through which the elastomer part 126 extends.
  • the frame 128 comprises at least one recess 174 (see FIGS. 15 and 16) which opens at an opening 176 which is arranged on an edge 178 of the frame 128 on the elastomer part side, the recess 174 being a narrow point 180 adjacent to the opening 176 and an enlarged area 182 which is connected to the mouth opening 176 of the recess 174 via the constriction 180.
  • the recess 174 does not open at an opening 176, but is designed as a passage opening 224 in the frame 128, which has an annularly closed edge 226.
  • the elastomer part 126 extends through this passage opening 224, whereby a particularly resilient form-fitting connection is achieved between the elastomer part 126 and the frame 128 because a frame undercut area 228 lying between the passage opening 224 and an inner edge 227 of the frame 128 is the Elastomer part 126 engages behind.
  • the contacting tabs 121 and the stacking edges 123 of the bipolar plate 118 protrude laterally, in a direction perpendicular to the stacking direction 104, over the frame 124.
  • the frame 128 has at least one positioning element 184 with a positioning opening 186 of the first sealing element 114 of an adjacent electrochemical unit 106 ′ is in engagement (see FIGS. 12 and 13).
  • the positioning element 184 is designed, for example, as a pin 188 protruding in the stacking direction 104 from the frame base body 160, for example essentially cylindrical.
  • the positioning opening 186 is formed in the elastomer part 126 of the first sealing element 114 of the adjacent electrochemical unit 106 and, prior to the assembly of the electrochemical device 100, has an undersize compared to the positioning element 184, which is introduced into the positioning opening 186 during assembly.
  • the diameter of the positioning opening 186 before assembly is smaller than the outer diameter of the positioning element 184, preferably by at least 0.1 mm, in particular by at least 0.2 mm.
  • the positioning element 184 is thus mechanically coupled to the elastomer part 126 in which the positioning opening 186 is formed by a force fit, in particular by a press fit.
  • the positioning element 184 thus also forms a coupling element 190, and the positioning opening 186 forms a coupling opening 192, the coupling element 190 and the coupling opening 192 together forming a coupling device 194, through which the first sealing element 114 of the one electrochemical unit 106 mechanically with the first Sealing element 114 of the adjacent electrochemical unit 106 'is coupled.
  • the coupling element 190 or the positioning element 184 extends through a passage opening 196 in the bipolar plate layers 120 and 122 of the bipolar plate 118 arranged between the first sealing element 114 of the one electrochemical unit 106 and the first sealing element 114 of the adjacent electrochemical unit 106 '.
  • the electrochemical device 100 further comprises a further coupling device 198, shown in FIG. 6, by which the second sealing element 116 of the one electrochemical unit 106 is mechanically connected to the frame 128 of the first sealing element 114 of the same electrochemical unit 106 and to that of the first sealing element 114 adjacent bipolar plate 118 is coupled.
  • This further coupling device 198 comprises a coupling element 190 in the form of a cup or mushroom head 200, which is formed in one piece with the second sealing element 116 made of elastomer material and extends through a coupling opening 192 which is provided in the frame 128 of the first sealing element 114.
  • the coupling element 198 has an undercut region 202, which engages behind the edge of the coupling opening 192 in the frame 128 of the first sealing element 114 (viewed in the stacking direction 104).
  • the coupling element 190 of the further coupling device 198 is also in engagement with a further coupling opening 204, which were located in the bipolar plates 120 and 122 of the bipolar plate 118 adjacent to the first sealing element 114 is provided.
  • the second sealing element 116 is thus also coupled to the bipolar plate 118 by the further coupling device 198.
  • the coupling element 190 of the further coupling device 198 is arranged on a tab 206 of the second sealing element 116, which is arranged outside the flow field sealing area 152 of the second sealing element 116 and is away from the flow field -Sealing area 152 of the second sealing element 116 extends away.
  • the coupling device 198 is designed as a latching device 208, by means of which the second sealing element 116 of the electrochemical unit 106 is latched with the first sealing element 114 of the same electrochemical unit 106.
  • the coupling element 190 of the coupling device 198 has a cavity 210, in which a positioning pin of a handling device, for example a robot, can engage during the assembly of the electrochemical unit 106 in order to place the second sealing element 116 in the area of the coupling device 198 relative to the first sealing element 114 to be positioned.
  • a positioning pin of a handling device for example a robot
  • the frame 128 has one or more handling openings 222, which are shown in particular in FIGS. 1, 6, 8 and 12 and are not filled with the elastomer material of the elastomer part 126.
  • a handling device can engage in these handling through openings 222 during the assembly of the electrochemical unit 106 or the electrochemical device 100 in order to position the first sealing element 114 relative to other components.
  • the frame 128 of the first sealing element 114 comprises a ventilation region 212 shown in FIGS. 21 and 22, via which a cavity of the forming tool is vented while the cavity is being filled with the elastomer material of the elastomer part 126.
  • the vent area 212 is filled with the elastomer material of the elastomer part 126, the elastomer material arranged in the vent area 212 containing air bubbles which were formed when the vent area 212 was filled during the injection molding process.
  • the ventilation area 212 which lies outside the medium channel sealing areas 146 and the flow field sealing area 142 of the first sealing element 114, these air bubbles in the elastomer material do not impair the sealing function of the first sealing element 114.
  • the ventilation area 212 therefore does not have to be separated after the first sealing element 114 has been produced in an injection molding process, but can remain on the first sealing element 114, which is used to assemble the electrochemical unit 106 and the electrochemical device 100.
  • the frame 128 In an entry area 214 of the ventilation area 212 through which the elastomer material penetrates into the ventilation area 212 during the injection molding process, the frame 128 has a smaller thickness, i.e. a smaller extent in the stacking direction 104, than in the areas adjoining the entry area 214 Basic frame body 160.
  • the thickness of the frame 128 increases in the venting area 212 up to an end area 216 or up to several, for example two, end areas 216 of the venting area 212.
  • the ventilation area 212 is preferably arranged at a point at which two elastomer injection areas of the elastomer part flow together. During the production of this elastomer part, each of the elastomer injection areas is filled with a flowable elastomer starting material through an elastomer injection point. The more such elastomer injection points and thus elastomer injection areas there are, the higher the number of ventilation areas 212 of the frame 128.
  • the presence of a ventilation area 212 is not absolutely necessary.
  • the frame 128 can also be designed without a ventilation area 212.
  • a second embodiment of an electrochemical device 100 shown in detail in FIG. 28 differs from the first embodiment shown in FIGS. 1 to 27, in particular in FIG. 13 corresponding to FIG. 28, in that the positioning element 184 is not frictionally connected to the elastomer part 126 of the first sealing element 114 of the adjacent electrochemical unit 106 by a press fit, but merely engages with play in a positioning opening 186 which is provided on the frame 128 of the first sealing element 114 of the adjacent electrochemical unit 106 '.
  • the first sealing element of the electrochemical unit is precisely positioned relative to the adjacent bipolar plate 118 in that the positioning element 184 in the form of the pin 188 engages with little play with a positioning opening 186 'which is located on the bipolar plate 118, in particular on the the second bipolar plate layer 122 facing away from the first sealing element 114 is formed.
  • the positioning element 184 also forms a coupling element 190, which is provided on the first sealing element 114 of the electrochemical unit 106 and is in engagement with the positioning opening 186 'of the bipolar plate 118 serving as a coupling opening 192.
  • the second embodiment of an electrochemical device 100 shown in FIG. 28 corresponds in terms of structure, function and manufacture with the first embodiment shown in FIGS. 1 to 27, reference being made to the above description.
  • a third embodiment of an electrochemical device 100 shown in detail in FIG. 29 differs from the first embodiment shown in FIGS. 1 to 27 in that the frame 128 of the first sealing element 114 is not formed in one piece, but rather comprises two or more separate frame parts 218 and has at least one gap 220 along its circumference which separates two frame parts 218 of the frame 128 from one another.
  • the gap 220 is preferably filled with elastomer material of the elastomer part 126.
  • the third embodiment of an electrochemical device 100 shown in FIG. 29 corresponds in terms of structure, function and manufacture with the first embodiment shown in FIGS. 1 to 27 or with the second embodiment shown in FIG Description is referred to in this respect.
  • a fourth embodiment of an electrochemical device 100 differs from the first embodiment described above and shown in FIGS. 1 to 27 in that the frame 128 of the frame sealing element 124 is stepped out, with an outer frame area 230 facing away from the elastomer part 126 being offset from an inner frame area 232 facing the elastomer part 126 along the stacking direction 104 of the electrochemical device 100.
  • each stepped frame 128 can be centered on a stepped frame 128 adjacent in the stacking direction.
  • the stepped design of the frame 128 can increase the rigidity of the frame 128 and / or better protection against contact can be achieved for the bipolar plates 118 covered on the outside by the frame 128.
  • the fourth embodiment of an electrochemical device 100 shown in FIG. 30 corresponds to the first embodiment shown in FIGS. 1 to 27 or to one of the embodiments shown in FIGS. 28 or 29 in terms of structure, function and manufacture the above description is referred to in this respect.
  • FIG. 30 The cross-section through the fourth embodiment of an electrochemical device 100 shown in FIG. 30 and taken parallel to the stacking direction is taken at the point which corresponds to the line 30-30 in FIG. 1 in the first embodiment, but (unlike in FIG 2, which shows only two electrochemical units which follow one another along the stacking direction 104, four electrochemical units 106 are shown which follow one another along the stacking direction 104.
  • a fifth embodiment of an electrochemical device 100 shown in detail in FIG. 31 differs from the first embodiment shown in FIGS. 1 to 27 and described above in that the frame 128 of the frame sealing element 124 is designed as an insert part 236, which is at least partially, preferably essentially completely, embedded in the elastomer material of the elastomer part 126 of the respective frame sealing element 124.
  • the insert 236 is preferably formed from a metallic material.
  • the insert part 236 comprises an outer frame area 230 and an inner frame area 232, the outer frame area 230 being connected to the inner frame area 232 via a curved area 238 and enclosing an obtuse angle ⁇ with the inner frame area 232.
  • the angle a is preferably greater than 100 °, in particular greater than 110 °.
  • angle ⁇ is preferably smaller than 160 °, in particular smaller than
  • the angle ⁇ can be approximately 140 °.
  • the angled structure of the frame 128 increases the rigidity of the frame 128 and / or improves the protection against accidental contact for the bipolar plates 118 of the electrochemical device 100, which are covered to the outside by the frame 128.
  • the fifth embodiment of an electrochemical device 100 shown in FIG. 31 corresponds to the first embodiment shown in FIGS. 1 to 27 or to one of the embodiments shown in FIGS. 28 and 29 in terms of structure, function and manufacture the above description is referred to in this respect.
  • the cross section shown in FIG. 31, taken parallel to the stacking direction, through the fifth embodiment of an electrochemical device 100 is taken at a point which corresponds to the point of the fourth embodiment, at which the cross section shown in FIG. 30 through the fourth embodiment of a electrochemical device 100 has been taken.
  • a sixth embodiment of an electrochemical device 100 differs from the first embodiment shown in FIGS. 1 to 27 in that the frame 128 of the frame sealing element 124 is provided with a sealing lip 240, around a gap 242 between to bridge two frames 128 of frame sealing elements 124 of adjacent electrochemical units 106 in each case along the stacking direction 104 of the electrochemical device 100.
  • the sealing lips 240 prevent a medium from escaping from the electrochemical device 100 and / or prevent contamination of the electrochemical device 100 by media penetrating from the outside.
  • the sealing lip 240 is preferably formed from an elastomer material.
  • the elastomer material of the sealing lip 240 can be identical to the elastomer material of the elastomer part 126 of the frame sealing element 124.
  • the sealing lip 240 is spaced apart from the elastomer part 126 of the frame sealing element 124.
  • the sealing lip 240 is preferably arranged between the elastomer part 126 of the frame sealing element 124 and an outer edge 244 of the frame 128 of the frame sealing element 124.
  • the sealing lip 240 is thus spaced apart from the elastomer part 126 in a direction perpendicular to the stacking direction 104.
  • the sixth embodiment of an electrochemical device 100 shown in FIG. 32 corresponds to the first embodiment shown in FIGS. 1 to 27 or to one of the embodiments shown in FIGS. 28 or 29 in terms of structure, function and manufacture the above description is referred to in this respect.
  • the cross section shown in FIG. 32 through the sixth embodiment of an electrochemical device 100 is taken at a point which corresponds to the position at which the cross section shown in FIG. 30 through the fourth embodiment of an electrochemical device 100 has been taken.
  • a seventh embodiment of an electrochemical device 100 differs from the first embodiment shown in FIGS. 1 to 27 in that the components of the adjacent electrochemical units 106 and 106 'are not only formed identically to one another, but are also mounted in the same orientation in the stack 102 of the electrochemical device 100, that is to say without a rotation by an angle of 180 ° about a central axis of rotation running parallel to the stacking direction 104.
  • FIG. 34 which corresponds to the illustration of FIG. 6 for the first embodiment of the electrochemical device 100, in this sixth embodiment the coupling elements 190 of adjacent electrochemical units 106 are directly above one another in the stacking direction 104.
  • the coupling elements 190 of electrochemical units 106 adjacent to one another in the stacking direction 104 touch one another directly in the assembled state of the electrochemical device 100.
  • the coupling elements 190 are more filigree and have a smaller height (measured along the stacking direction 104) than in the first embodiment of the electrochemical device 100.
  • the seventh embodiment of an electrochemical device 100 shown in FIG. 34 corresponds in terms of structure, function and manufacture to the first embodiment shown in FIGS. 1 to 27 or to one of the embodiments shown in FIGS. 28 to 32 the above description is referred to in this respect.

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Abstract

La présente invention a pour objet de créer dispositif électrochimique comprenant une pluralité d'unités électrochimiques qui sont disposées l'une après l'autre le long d'une direction d'empilement et dont chacune comprend une membrane, une première couche de diffusion de gaz, une seconde couche de diffusion de gaz, un premier élément d'étanchéité relié d'un seul tenant à la première couche de diffusion de gaz, un second élément d'étanchéité relié d'un seul tenant à la seconde couche de diffusion de gaz et à une plaque bipolaire, les éléments d'étanchéité du dispositif électrochimique étant simples à produire et aptes à être positionnés de manière précise par rapport aux autres composants du dispositif électrochimique et aptes à être assemblés avec les autres composants du dispositif électrochimique, l'un des éléments d'étanchéité de chaque unité électrochimique étant réalisé sous la forme d'un élément d'étanchéité cadre qui comprend une partie élastomère et un cadre, le cadre étant constitué d'un matériau qui a une stabilité dimensionnelle supérieure à celle du matériau élastomère à partir duquel la partie élastomère est fabriquée.
PCT/EP2020/085092 2019-12-19 2020-12-08 Dispositif électrochimique et procédé de fabrication d'un élément d'étanchéité pour une unité électrochimique d'un dispositif électrochimique WO2021122164A1 (fr)

Priority Applications (2)

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EP20821196.1A EP4077767A1 (fr) 2019-12-19 2020-12-08 Dispositif électrochimique et procédé de fabrication d'un élément d'étanchéité pour une unité électrochimique d'un dispositif électrochimique
CN202080083796.5A CN115053020A (zh) 2019-12-19 2020-12-08 电化学设备和用于制造电化学设备的电化学单元的密封元件的方法

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DE102019135292.4A DE102019135292A1 (de) 2019-12-19 2019-12-19 Elektrochemische Vorrichtung und Verfahren zum Herstellen einer elektrochemischen Vorrichtung
DE102019135290.8 2019-12-19
DE102019135290 2019-12-19
DE102019135292.4 2019-12-19
DE102020120293.8 2020-07-31
DE102020120293.8A DE102020120293A1 (de) 2019-12-19 2020-07-31 Elektrochemische Vorrichtung und Verfahren zum Herstellen eines Dichtelements für eine elektrochemische Einheit einer elektrochemischen Vorrichtung

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PCT/EP2020/085092 WO2021122164A1 (fr) 2019-12-19 2020-12-08 Dispositif électrochimique et procédé de fabrication d'un élément d'étanchéité pour une unité électrochimique d'un dispositif électrochimique

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JP4077509B2 (ja) * 2006-04-21 2008-04-16 松下電器産業株式会社 固体高分子型燃料電池
US7790305B2 (en) * 2007-02-20 2010-09-07 Freudenberg-Nok General Partnership Gas diffusion layers with integrated seals having interlocking features
DE102007030343A1 (de) * 2007-06-29 2009-01-02 Carl Freudenberg Kg Gasdiffusionseinheit für eine Brennstoffzelle
JP2011040359A (ja) * 2009-07-17 2011-02-24 Nok Corp 燃料電池用ガス拡散層一体型ガスケット

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US20030104262A1 (en) * 2000-06-29 2003-06-05 Yuichi Kuroki Constituent part for fuel cell
JP2003007328A (ja) * 2001-06-20 2003-01-10 Nok Corp 燃料電池用構成部品
JP2006210234A (ja) * 2005-01-31 2006-08-10 Uchiyama Mfg Corp 燃料電池用構成部材
US20180183073A1 (en) * 2015-06-15 2018-06-28 Nissan Motor Co., Ltd. Fuel cell electrode structure, metal separator, fuel cell employing said fuel cell electrode structure and said metal separator, and die for fabricating said fuel cell electrode structure

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