WO2022111926A1 - Bipolarplatte für eine elektrochemische zelle, verfahren zur herstellung der bipolarplatte, anordnung elektrochemischer zellen und verfahren zum betrieb der anordnung elektrochemischer zellen - Google Patents
Bipolarplatte für eine elektrochemische zelle, verfahren zur herstellung der bipolarplatte, anordnung elektrochemischer zellen und verfahren zum betrieb der anordnung elektrochemischer zellen Download PDFInfo
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- WO2022111926A1 WO2022111926A1 PCT/EP2021/079485 EP2021079485W WO2022111926A1 WO 2022111926 A1 WO2022111926 A1 WO 2022111926A1 EP 2021079485 W EP2021079485 W EP 2021079485W WO 2022111926 A1 WO2022111926 A1 WO 2022111926A1
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- WO
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- Prior art keywords
- bead
- bipolar plate
- opening
- plate
- arrangement
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000011324 bead Substances 0.000 claims abstract description 84
- 239000012528 membrane Substances 0.000 claims description 19
- 238000004049 embossing Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 description 28
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910001868 water Inorganic materials 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
-
- 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
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B13/00—Diaphragms; Spacing elements
- C25B13/02—Diaphragms; Spacing elements characterised by shape or form
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- 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
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
-
- 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
- C25B9/60—Constructional parts of cells
-
- 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
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
- H01M8/0208—Alloys
- H01M8/021—Alloys based on iron
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0256—Vias, i.e. connectors passing through the separator material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
-
- 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
-
- 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
- H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
-
- 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
- Bipolar plate for an electrochemical cell method of making the
- Bipolar plate Bipolar plate, electrochemical cell assembly and method of operating the electrochemical cell assembly
- the invention relates to a bipolar plate for an electrochemical cell, comprising at least a first monopolar plate with a first bead and a second monopolar plate with a second bead, the first bead and the second bead being arranged opposite one another and forming a channel, the first bead and the second bead each comprise a central base and at least two inclined surfaces. Furthermore, the invention relates to a method for producing the bipolar plate and an arrangement of electrochemical cells and a method for operating the arrangement of electrochemical cells.
- Electrochemical cells are electrochemical energy converters and are known in the form of fuel cells or electrolyzers.
- a fuel cell converts chemical reaction energy into electrical energy.
- known fuel cells in particular hydrogen (H 2 ) and oxygen (O 2 ) are converted into water (H 2 O), electrical energy and heat.
- PEM proton exchange membranes
- Fuel cells have an anode and a cathode.
- the fuel is continuously fed to the anode of the fuel cell and is catalytically oxidized to protons with the release of electrons, which then reach the cathode.
- the electrons emitted are derived from the fuel cell and flow to the cathode via an external circuit.
- the oxidizing agent is supplied to the cathode of the fuel cell and reacts by absorbing the electrons from the external circuit and protons to form water. The resulting water is drained from the fuel cell. The gross reaction is:
- a voltage between the anode and the cathode of the fuel cell There is a voltage between the anode and the cathode of the fuel cell.
- several fuel cells can be arranged mechanically one behind the other to form a fuel cell stack, which is also referred to as a stack or fuel cell assembly, and connected electrically in series.
- a stack of electrochemical cells which may be referred to as an electrochemical cell array, typically has end plates that compress the individual cells together and provide stability to the stack.
- the electrodes ie the anode and the cathode, and the membrane can be structurally combined to form a membrane electrode assembly (MEA), which is also referred to as a membrane electrode assembly.
- MEA membrane electrode assembly
- Stacks of electrochemical cells also include bipolar plates, also referred to as gas distribution plates or distribution plates.
- Bipolar plates are used to evenly distribute fuel to the anode and evenly distribute oxidant to the cathode.
- the bipolar plates ensure a planar electrical contact with the membrane.
- a fuel cell stack typically includes up to a few hundred individual fuel cells that are stacked on top of one another in tiers. The individual fuel cells have an MEA and a bipolar plate half on the anode side and on the cathode side.
- a fuel cell includes in particular an anode monopolar plate and a cathode monopolar plate, usually in the form of embossed metal sheets, which together form the bipolar plate and thus channels for conducting gas and liquids and between which the cooling medium can flow.
- electrochemical cells typically include gas diffusion layers sandwiched between a bipolar plate and an MEA.
- an electrolyser In contrast to a fuel cell, an electrolyser is an energy converter which splits water into hydrogen and oxygen when an electrical voltage is applied. Electrolyzers also have, among other things, MEAs, bipolar plates and gas diffusion layers.
- Electrochemical cells in a stack are often supplied with the media, in particular hydrogen and oxygen, or these are removed, via media channels arranged perpendicularly to the membrane of the electrochemical cell.
- the media channels are fluidically connected to the electrochemical cells, in particular to the bipolar plates, through ports, which can also be referred to as fluid connections.
- the media channels are usually located at the edge of the stack and are often created by congruently stacked recesses that form the ports.
- the media are routed from the ports through port bushings into what is known as the flow field, the active area of the bipolar plate or the membrane.
- the port bushings for air or hydrogen pointing to the MEA must be designed in such a way that the port bushings provide the largest possible opening for the media flowing in and out and, on the other hand, offer the best possible mechanical support for seals arranged on the opposite side of the MEA .
- DE 10158772 CI and DE 10248531 B4 relate to fuel cell stacks with a layering of several fuel cells, with media being supplied or removed through bipolar plates and bead arrangements being provided for sealing.
- a bipolar plate for an electrochemical cell comprising at least a first monopolar plate with a first bead and a second monopolar plate with a second bead, the first bead and the second bead being arranged opposite one another and forming a channel, the first bead and the second bead each comprise a central base area and at least two inclined surfaces and the first bead and/or the second bead comprise at least one outer base area and wherein on the first bead and/or the second bead there is at least one opening element for the passage of at least one medium between one of the at least two inclined surfaces and the at least one outer base surface and wherein the at least one opening element has a lateral surface, a first open side surface, a second open side surface and a top surface with an opening and the first open side surface in the at least one outer Base and the second open side surface is located in one of the at least two inclined surfaces.
- an arrangement of electrochemical cells comprising at least the bipolar plate and at least one membrane-electrode arrangement, the at least one opening element being arranged on the at least one bipolar plate in such a way that the opening faces the at least one membrane-electrode arrangement.
- the invention relates to a method for producing the bipolar plate, the first bead and/or the second bead and the at least one opening element being produced by means of embossing from a base plate of the first monopolar plate or the second monopolar plate, and a method for operating the arrangement, wherein the at least one medium is guided from the channel through the at least one opening element to the at least one membrane electrode assembly, wherein the at least one medium flows through the second open side surface and/or through the first open side surface into the at least one orifice element enters and exits through the orifice from the at least one orifice element.
- the electrochemical cell which is preferably a fuel cell or an electrolyzer, preferably comprises at least one bipolar plate according to the invention, at least one gas diffusion layer and at least one membrane or membrane-electrode assembly.
- a membrane-electrode arrangement is arranged between two bipolar plates.
- the arrangement of electrochemical cells which is preferably a fuel cell stack, preferably comprises at least one membrane electrode arrangement, at least one bipolar plate according to the invention, more preferably at least two bipolar plates according to the invention, and at least one port.
- the at least one port can be an inlet or an outlet.
- the bipolar plate preferably comprises carbon such as graphite, a metal such as stainless steel or titanium and/or an alloy containing the metal. More preferably, the bipolar plate is made of carbon, the metal and/or the alloy.
- the at least one medium preferably comprises hydrogen, air or oxygen, water and/or a cooling medium, more preferably the at least one medium comprises the cooling medium, hydrogen or a mixture containing oxygen and/or water.
- the at least one opening element serves to conduct the at least one medium through the first monopolar plate or the second monopolar plate. Preferably, only the at least one opening element is used to conduct the at least one medium through the first monopolar plate or the second monopolar plate.
- the opening element can also be referred to as a molding or embossing.
- the first bead and/or the second bead can also be referred to as, in particular, metallic sealing beads.
- the first bead and the second bead preferably form a sealing element.
- the sealing element which preferably seals the at least one port from the outside and from other media, is overcome by the at least one medium, in particular through the at least one opening in order, if necessary, first to reach a distribution structure and then an active surface of the bipolar plate.
- the first bead and/or the second bead are preferably arranged on the at least one port. More preferably, the first bead and/or the second bead surround the at least one port, more preferably completely.
- the first bead and/or the second bead can only surround the at least one port and preferably only exactly one port. Furthermore, the first bead and the second bead can surround, preferably completely, the active surface of the bipolar plate or the MEA, in particular arranged adjacent, so that the first bead and the second bead together act as a sealing element of the at least one port or the active surface.
- the opening can also be referred to as a through opening, breakthrough or passage.
- the first bead and/or the second bead preferably have a large number of opening elements and accordingly a large number of openings.
- the opening has a preferably round cross-sectional area.
- the opening is preferably produced by perforating, in particular, the base plate of the first monopolar plate or the second monopolar plate.
- the at least one opening element can be produced first and then the opening can be punched out. Machining is also possible.
- the edge contour of the at least one opening element can be optimized in a further embossing step.
- the central base area and the at least one outer base area preferably represent horizontal areas which are arranged essentially parallel to the base plate of the first monopolar plate or the second monopolar plate. More preferably, the central base area and the at least one outer base area of the first bead and/or the second bead are each arranged essentially parallel to one another. “Essentially parallel” means that the bases, ie the middle base and/or the at least one outer base, form an angle of less than 20°, preferably less than 10°, with one another or with the base plate.
- the central base area of the first monopolar plate or the second monopolar plate is preferably arranged between two inclined surfaces.
- the at least two inclined surfaces can also be referred to as legs or flanks.
- the at least two inclined surfaces are inclined in particular with respect to the central base surface and the at least one outer base surface.
- An inclination angle is preferably in a range from 100° to 170°, more preferably from 110° to 160°.
- the central base area and the at least one outer base area are preferably flat areas.
- the at least two inclined surfaces can be curved, ie have at least one curvature.
- the at least two inclined surfaces, which in particular are each arranged adjacent to the central base surface, preferably have an angle of inclination with opposite signs.
- the first bead and/or the second bead can have at least two opening elements, which can be arranged on opposite sides of the central base area.
- the at least two opening elements can be arranged opposite one another or offset from one another.
- the central base area preferably has a first height, based on the base plate of the first monopolar plate or the second monopolar plate, which in particular represents a base level.
- the at least one outer base surface, on which in particular the at least one opening element is arranged is arranged on no more than one inclined surface.
- the at least one outer base area is accordingly preferably arranged at a second height, which is more preferably less than 10% of the first height.
- the at least one outer base area is arranged on the ground level.
- the opening is arranged in the top surface and the top surface, in particular the opening of the at least one opening element, is preferably arranged at an exit height that is more than 20%, in particular more than 50%, of the first height.
- the first bead and/or the second bead each have at least three inclined surfaces, in particular three or four inclined surfaces, wherein the at least one outer base surface is arranged in particular directly between two of the at least three inclined surfaces and forms a step, in particular between the two inclined surfaces.
- the step preferably has a third height, the third height being less than the first height and more preferably the third height being 20% to 80%, more preferably 30% to 70%, particularly preferably 40% to 60% of the first height amounts to.
- the two inclined surfaces, which are arranged in particular on the same side of the central base surface or border on the same step, can have the same angle of inclination.
- the at least one opening element is arranged on the step.
- the central base area of the first bead and/or the second bead preferably has a seal in each case. More preferably, the central base area of the first bead and the central base area of the second bead each have a seal.
- the seal is preferably designed as a coating.
- the seal preferably comprises a polymer such as an elastomer, more preferably the seal comprises a material selected from the group consisting of silicone, rubber, in particular fluororubber (FKM), polytetrafluoroethylene (PTFE) and mixtures thereof.
- the at least one opening element can be designed as a scoop and/or described as half a pot. Furthermore, the at least one opening element can at least partially have a conical shape or the shape of a polyhedron, which is preferably delimited by rhombuses and/or rectangles. In particular, the at least one opening element has the shape of a rhombohedron.
- the top surface is preferably arranged essentially parallel to the at least one outer base surface and in particular to the base plate of the first monopolar plate or the second monopolar plate.
- the top surface preferably has a rectangular shape or is at least partially circular or round.
- the top surface partially has the shape of a semicircle.
- the lateral surface is preferably delimited by the top surface, the at least one outer base surface and one of the at least two inclined surfaces.
- the opening preferably has a round cross section.
- the opening can form a third open side surface of the opening element, so that the opening element can also be referred to as a scoop.
- the top surface is preferably completely open.
- the port of the bipolar plate is fluidly connected to the active surface by the at least one opening element, the port area being stiffened and supported by the opening element at the same time in order to prevent undesired deformation of the port area and to form a contact surface for sealing.
- the flow guidance can be optimized by designing the at least one opening element, for example by a targeted design of the lateral surface.
- the circular opening has only small manufacturing tolerances.
- FIG. 1 shows a schematic representation of an electrochemical cell
- FIG. 2 shows an exploded view of an arrangement of electrochemical cells
- FIG. 3 shows a perspective view of a bead arrangement according to the prior art
- Figure 4 is a perspective view of a first monopolar plate with opening elements
- Figure 5 is a cross-sectional view of a single step bead assembly.
- FIG. 1 schematically shows an electrochemical cell 1 in the form of a fuel cell.
- the electrochemical cell 1 has a membrane 2 as the electrolyte.
- the membrane 2 separates a cathode compartment 6 from an anode compartment 8.
- An electrode layer 3 , a gas diffusion layer 5 and a bipolar plate 7 are arranged on the membrane 2 in the cathode compartment 6 and anode compartment 8 .
- the composite of the membrane 2 and the electrode layer 3 can also be referred to as a membrane-electrode assembly 4 .
- Oxygen 9 reaches the gas diffusion layer 5 through the bipolar plate 7 in the cathode compartment 6 and hydrogen 11 reaches the corresponding gas diffusion layer 5 through the bipolar plate 7 of the anode compartment 8.
- FIG. 2 shows an exploded view of an arrangement 69 of electrochemical cells 1 which represents a fuel cell stack.
- the arrangement 69 includes individual electrochemical cells 1, which are clamped between current collectors 33 and end plates 35 with clamping elements 37.
- FIG 3 shows a perspective view of a section of a bipolar plate 7 with a bead arrangement 57.
- the bipolar plate 7 includes a first Monopolar plate 13 with a first bead 15 and a second monopolar plate 17 with a second bead 19, each according to the prior art.
- the first bead 15 and the second bead 19 are arranged opposite each other and form a channel 21.
- the first bead 15 and the second bead 19 each comprise a central base surface 23 and two inclined surfaces 24, the inclined surfaces 24 having openings 27 through which a medium 29 can be guided.
- FIG. 4 shows a perspective view of a section of a first monopolar plate 13 with a first bead 15.
- the first monopolar plate 13 has a central base area 23, two inclined surfaces 24 and an outer base area 25.
- Two opening elements 111 for the passage of the medium 29 are arranged on the first bead 15 between one of the inclined surfaces 24 and the outer base surface 25 .
- the opening elements 111 each have a lateral surface 121 , a first open side surface 113 , a second open side surface 115 and a top surface 140 .
- the top surfaces 140 each have an opening 27.
- the first open side surface 113 is in the outer base surface 25 and the second open side surface 115 is in the inclined surface 24.
- the medium 29 enters the opening element 111 via the first open side surface 113 and the second open side surface 115 and leaves it again through the opening 27 in the top surface 140.
- a first orifice member 141 is shown wherein the top surface 140 is partially circular. In the case of a second opening element 143, the top surface 140 has a rectangular shape.
- the central base surface 23 of the first bead 15 is arranged at a first height 59, while the cover surfaces 140 are arranged at a second height 61, in each case in relation to a base plate 123 of the first monopolar plate 13.
- FIG. 5 shows a cross-sectional view of a further embodiment of a bead arrangement 57 of a bipolar plate 7.
- the first bead 15 has four inclined surfaces 24, with an outer base surface 25 being arranged between two of the four inclined surfaces 24 and forming a step 31.
- Corresponding the opening element 111 is arranged on the step 31 .
- the step 31 is arranged at a third height 63 with respect to the base plate 123 of the first monopolar plate 13 .
- the central base surfaces 23 have a seal 47 .
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/254,482 US20240047706A1 (en) | 2020-11-30 | 2021-10-25 | Bipolar plate for an electrochemical cell, method for manufacturing said bipolar plate, arrangement of electrochemical cells, and method for operating said arrangement of electrochemical cells |
CN202180092275.0A CN116888775A (zh) | 2020-11-30 | 2021-10-25 | 用于电化学电池的双极板、用于制造双极板的方法、电化学电池的组件和用于运行电化学电池的组件的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102020215013.3 | 2020-11-30 | ||
DE102020215013.3A DE102020215013A1 (de) | 2020-11-30 | 2020-11-30 | Bipolarplatte für eine elektrochemische Zelle, Verfahren zur Herstellung der Bipolarplatte, Anordnung elektrochemischer Zellen und Verfahren zum Betrieb der Anordnung elektrochemischer Zellen |
Publications (1)
Publication Number | Publication Date |
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WO2022111926A1 true WO2022111926A1 (de) | 2022-06-02 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2021/079485 WO2022111926A1 (de) | 2020-11-30 | 2021-10-25 | Bipolarplatte für eine elektrochemische zelle, verfahren zur herstellung der bipolarplatte, anordnung elektrochemischer zellen und verfahren zum betrieb der anordnung elektrochemischer zellen |
Country Status (4)
Country | Link |
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US (1) | US20240047706A1 (de) |
CN (1) | CN116888775A (de) |
DE (1) | DE102020215013A1 (de) |
WO (1) | WO2022111926A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10158772C1 (de) | 2001-11-23 | 2003-06-26 | Reinz Dichtungs Gmbh & Co Kg | Brennstoffzellensystem |
DE10248531B4 (de) | 2002-10-14 | 2005-10-20 | Reinz Dichtungs Gmbh & Co Kg | Brennstoffzellensystem sowie Verfahren zur Herstellung einer in dem Brennstoffzellensystem enthaltenen Bipolarplatte |
DE102005057045A1 (de) * | 2005-11-30 | 2007-06-06 | Daimlerchrysler Ag | Bipolarplatte und Brennstoffzelleneinheit |
JP4959190B2 (ja) * | 2002-10-14 | 2012-06-20 | ラインツ−ディクトゥングス−ゲーエムベーハー | 電気化学的システム |
-
2020
- 2020-11-30 DE DE102020215013.3A patent/DE102020215013A1/de active Pending
-
2021
- 2021-10-25 US US18/254,482 patent/US20240047706A1/en active Pending
- 2021-10-25 CN CN202180092275.0A patent/CN116888775A/zh active Pending
- 2021-10-25 WO PCT/EP2021/079485 patent/WO2022111926A1/de active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10158772C1 (de) | 2001-11-23 | 2003-06-26 | Reinz Dichtungs Gmbh & Co Kg | Brennstoffzellensystem |
DE10248531B4 (de) | 2002-10-14 | 2005-10-20 | Reinz Dichtungs Gmbh & Co Kg | Brennstoffzellensystem sowie Verfahren zur Herstellung einer in dem Brennstoffzellensystem enthaltenen Bipolarplatte |
JP4959190B2 (ja) * | 2002-10-14 | 2012-06-20 | ラインツ−ディクトゥングス−ゲーエムベーハー | 電気化学的システム |
DE102005057045A1 (de) * | 2005-11-30 | 2007-06-06 | Daimlerchrysler Ag | Bipolarplatte und Brennstoffzelleneinheit |
Also Published As
Publication number | Publication date |
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US20240047706A1 (en) | 2024-02-08 |
CN116888775A (zh) | 2023-10-13 |
DE102020215013A1 (de) | 2022-06-02 |
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