EP4566103A2 - Procédé d'assemblage par liaison de matière d'une première couche de plaque bipolaire et d'une seconde couche de plaque bipolaire, plaque bipolaire pour une unité électrochimique d'un dispositif électrochimique et dispositif électrochimique - Google Patents

Procédé d'assemblage par liaison de matière d'une première couche de plaque bipolaire et d'une seconde couche de plaque bipolaire, plaque bipolaire pour une unité électrochimique d'un dispositif électrochimique et dispositif électrochimique

Info

Publication number
EP4566103A2
EP4566103A2 EP23748005.8A EP23748005A EP4566103A2 EP 4566103 A2 EP4566103 A2 EP 4566103A2 EP 23748005 A EP23748005 A EP 23748005A EP 4566103 A2 EP4566103 A2 EP 4566103A2
Authority
EP
European Patent Office
Prior art keywords
bipolar plate
plate layer
support structure
support
connecting seam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23748005.8A
Other languages
German (de)
English (en)
Inventor
Michael Schaich
Arno BAYER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ekpo Fuel Cell Technologies GmbH
Original Assignee
Ekpo Fuel Cell Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ekpo Fuel Cell Technologies GmbH filed Critical Ekpo Fuel Cell Technologies GmbH
Publication of EP4566103A2 publication Critical patent/EP4566103A2/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—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
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
    • 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
    • H01M8/2404—Processes or apparatus for grouping fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/247—Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
    • H01M8/248—Means for compression of the fuel cell stacks
    • 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 a method for materially connecting a first bipolar plate layer and a second bipolar plate layer of a bipolar plate for an electrochemical unit of an electrochemical device which comprises a plurality of electrochemical units which follow one another along a stacking direction, the method comprising the following:
  • the connecting seam is preferably produced by welding, in particular by laser welding.
  • a specially adapted and high-precision welding tool which includes clamping tools for applying a clamping force to the first bipolar plate layer and the second bipolar plate layer, so that the first bipolar plate layer and the second bipolar plate layer are to be connected to one another in the contact areas in which the bipolar plate layers are to be connected to one another , only to have an almost "technical zero gap" with a height (along the stacking direction of the electrochemical Device) are spaced apart by less than 0.03 mm.
  • clamping tools designed as clamping webs must be placed on flat areas of the bipolar plate layers on both sides of the connecting seam to be created in order to achieve a sufficient clamping effect.
  • the connecting seams and the flat areas of the bipolar plate layers that have to be kept free on both sides of the connecting seams require a significant proportion of the total space available on the bipolar plate, which is disadvantageous in terms of development and design, as there is also a lot of space for the arrangement of the bipolar plate layers by forming Introduced elements are required which direct the flow of media to be supplied to the electrochemical device (anode gas, cathode gas, coolant) and/or support components of electrochemical units adjacent to the bipolar plate, for example gas diffusion layers or components of sealing arrangements of the electrochemical units.
  • the present invention is based on the object of creating a method for the material connection of a first bipolar plate layer and a second bipolar plate layer of a bipolar plate for an electrochemical unit of an electrochemical device of the type mentioned, which makes it possible to connect the two bipolar plate layers to one another in a process-reliable manner, without the to deteriorate the fluidic properties of the bipolar plate or to impair the support function of the bipolar plate for components of the electrochemical units of the electrochemical device.
  • This object is achieved according to the invention in a method for materially connecting a first bipolar plate layer and a second bipolar plate layer of a bipolar plate for an electrochemical unit of an electrochemical device with the features of the preamble of claim 1 in that at least one clamping tool is attached to a support surface of at least one support structure of at least one of the Bipolar plate layers are supported, wherein the support surface of the support structure is offset from the surface of the bipolar plate layer on which the support structure is formed, in the contact area along the stacking direction away from the other bipolar plate layer.
  • the solution according to the invention is based on the concept of structures required anyway for directing the media flows and/or for supporting components of the electrochemical units, which are preferably formed into at least one of the bipolar plate layers, in addition to supporting at least one clamping tool during the production of a connecting seam between the to use the first bipolar plate layer and the second bipolar plate layer of the bipolar plate.
  • the at least one support structure is designed so that it has a support surface for supporting a clamping tool during the production of the connecting seam, this support surface preferably also being used to support a component of an electrochemical unit adjacent to the support structure, for example a gas diffusion layer or a component of a sealing arrangement of an electrochemical unit , can serve.
  • the height of the support structure that is, the distance of the support surface from the surface of the bipolar plate layer on which the support structure is formed, in a contact area in which this bipolar plate layer is on the respective other bipolar plate layer - preferably flat - is coordinated with the adjacent component of an electrochemical unit to be supported, for example a membrane-electrode arrangement.
  • the shape, especially the outer contour, of the support structure is optimized for the creation process of the connecting seam.
  • the at least one support structure can, for example, have the shape of a bowl or “dimple” with a circular, oval or free-shaped edge.
  • the edge of a support structure is a line at which the support structure merges into a flat area aligned parallel to the stacking direction.
  • Such a support structure can be arranged on an anode-side bipolar plate layer or on a cathode-side bipolar plate layer.
  • Such a support structure is preferably formed by a forming process on one of the bipolar plate layers, for example by an embossing process or a deep-drawing process.
  • Such a support structure can be formed on one side of the anode-side bipolar plate layer or on the cathode-side bipolar plate layer, the other bipolar plate layer having a flat open surface in the corresponding area, against which a clamping tool can rest during the production of a connecting seam.
  • a, preferably cup-shaped, support structure is also formed on the other bipolar plate layer, which - viewed along the stacking direction of the electrochemical device - is essentially congruent with the support structure on the first bipolar plate layer or only slightly opposite Support structure is offset on the first bipolar plate layer.
  • At least one web structure on at least one of the bipolar plate layers to be connected to one another is designed to be web-shaped and runs essentially parallel to the connecting seam.
  • a support surface formed on such a web-shaped support structure preferably has an extension perpendicular to the stacking direction of less than 3 mm, particularly preferably of less than 1.5 mm.
  • Such a web-shaped support structure can be arranged on one side only on an anode-side bipolar plate layer or only on a cathode-side bipolar plate layer, with the other bipolar plate layer in this area has a flat open surface to which a clamping tool can be applied while the connecting seam is being created.
  • the other bipolar plate layer is also provided with a second web-shaped support structure, which - with respect to the contact plane of the two bipolar plate layers - is designed symmetrically to the first web-shaped support structure or only deviates slightly from its shape.
  • the position of the second web-shaped support structure - viewed along the stacking direction - is essentially congruent with the position of the first web-shaped support structure or only slightly offset from the position of the first web-shaped support structure.
  • edges of the support structures at which the support structures merge into a flat area of the respective bipolar plate layer, preferably meet again on both opposite sides of the web-shaped support structure in such a way that the two bipolar plate layers rest against one another "on a block". This results in a force balance when the web-shaped support structures are pressed using the clamping tools during the creation of the connecting seam, in which the forces exerted by the bipolar plate layers on one another and on the clamping tools are equal to one another ("Actio equals Reactio").
  • one of the bipolar plate layers to be connected to one another has a plurality of web-shaped support structures which run transversely to the connecting seam and end at a short distance from the connecting seam.
  • the other bipolar plate layer can have a flat open surface in the area of these tapering web-shaped support structures, onto which a clamping tool can be applied during the production of the connecting seam.
  • the other bipolar plate layer has one or more web-shaped support structures running essentially parallel to the connecting seam in the area in which the first bipolar plate layer has web-shaped support structures that run transversely to the connecting seam.
  • the edges of the support structures meet in the area between the web-shaped support structures of the first bipolar plate layer, which run transversely to the connecting seam, and on the side of the web-shaped support structures of the second bipolar plate layer facing away from the connecting seam in such a way that the two bipolar plate layers are "on block" at these points. lie against each other.
  • a balance of forces is achieved in which the forces exerted by the bipolar plate layers on one another and on the clamping tools are equal to one another ("Actio equals Reactio").
  • the edge of a support structure, at which the support structure merges into a flat area of the bipolar plate layer, is preferably at a distance from the connecting seam which is smaller than 1 mm, in particular smaller than 0.5 mm, particularly preferably smaller than 0.1 mm.
  • the edge of the support structure which is formed on one of the bipolar plate layers, preferably meets the edge of a further support structure, which is formed on the other bipolar plate layer, in order to ensure that the bipolar plate layers are on this Section of their edges rest against each other "on block” in order to achieve a sufficient supporting effect through the balance of forces created thereby ("Actio equals Reactio").
  • These sections of the edges of the support structures facing away from the connecting seam preferably have a distance from the connecting seam that is greater than 1 mm and/or less than 5 mm.
  • the at least one support structure of the bipolar plate produced according to the invention allows, on the one hand, to arrange a clamping tool very close to the connecting seam during the production of a connecting seam.
  • the at least one support structure can serve to support an adjacent component of an electrochemical unit, for example a gas diffusion layer or a component of a sealing arrangement of an electrochemical unit.
  • the at least one support structure is designed as a stable element for absorbing the clamping force of the clamping tools during the creation of the connecting seam and is placed as close as possible to the connecting seam.
  • the at least one support structure which is formed on one of the bipolar plate layers, is preferably supported both on its side facing the connecting seam and on its side facing away from the connecting seam on a support structure, which is formed on the other bipolar plate layer.
  • the bipolar plate layers to be connected to one another are only spaced apart by a small gap from one another in the contact area in which they lie against one another - preferably flatly - and are to be connected to one another by the connecting seam which has a height (along the stacking direction) that is less than 0.03 mm.
  • the supporting effect of the support structure ensures during operation of the electrochemical device that the component of an electrochemical unit supported on the support structure, for example a gas diffusion layer, a sub-gasket or another element of a sealing arrangement of an electrochemical unit, does not get into the space between a medium Distribution area and a medium passage opening of the bipolar plate penetrates and thereby closes media outlets of sealing beads or a medium distribution area.
  • a gas diffusion layer, a sub-gasket or another element of a sealing arrangement of an electrochemical unit does not get into the space between a medium Distribution area and a medium passage opening of the bipolar plate penetrates and thereby closes media outlets of sealing beads or a medium distribution area.
  • At least one of the clamping tools is supported on several support surfaces of several different support structures and on several contact areas of the bipolar plate layers, which lie between the support structures.
  • At least one first clamping tool is supported on at least one first support structure, which is formed on the first bipolar plate layer, and at least one second clamping tool is supported on at least one second support structure, which is formed on the second bipolar plate layer.
  • the first support structure has a first edge at which the first support structure merges into a flat region of the first bipolar plate layer, and the second support structure has a second edge at which the second support structure merges into a flat region of the second bipolar plate layer.
  • the first edge and the second edge are preferably essentially congruent with one another in a projection onto a plane aligned perpendicular to the stacking direction or preferably deviate from one another by a distance of at most 0.5 mm. This distance is preferably measured perpendicular to the longitudinal direction of the first edge or perpendicular to the longitudinal direction of the second edge.
  • at least one support structure is formed at a location of one of the bipolar plate layers, which is opposite a flat region of the other bipolar plate layer that is not provided with a support structure.
  • the support surface of at least one support structure preferably has a smallest extent (a) perpendicular to the stacking direction, which is at least 0.1 mm, in particular at least 0.5 mm.
  • the support surface of at least one support structure preferably has a smallest extent (a) perpendicular to the stacking direction, which is at most 3 mm, in particular at most 1.5 mm.
  • the support surface of at least one support structure has a greatest extent perpendicular to the stacking direction, which is greater than 3 mm, in particular greater than 5 mm.
  • At least one support structure has an edge at which the support structure merges into a flat area of the bipolar plate layer on which the support structure is formed, the smallest distance (d) of the edge of the support structure from the Center line of the connecting seam is at most 0.8 mm, in particular at most 0.5 mm, particularly preferably at most 0.3 mm.
  • the smallest distance (d) of the edge of the support structure from the center line of the connecting seam is preferably taken perpendicular to the center line of the connecting seam. Furthermore, it is preferably provided that at least one support structure has an edge at which the support structure merges into a flat area of the bipolar plate layer on which the support structure is formed, the greatest distance (D) of the edge of the support structure from the center line of the connecting seam being at most 5 mm, in particular at most 3 mm, particularly preferably at most 2 mm.
  • the greatest distance (D) from the edge of the support structure is preferably taken perpendicular to the center line of the connecting seam.
  • At least one of the support structures can be cup-shaped.
  • At least one support structure is designed to be circular or oval in a top view along the stacking direction.
  • At least one support structure is designed to be web-shaped.
  • a web-shaped support structure can run essentially parallel to the connecting seam, at least in sections.
  • the distance (d') from the center line of the connecting seam is preferably taken perpendicular to the center line of the connecting seam.
  • the present invention further relates to a bipolar plate for an electrochemical unit of an electrochemical device, which comprises a plurality of electrochemical units which follow one another along a stacking direction, the bipolar plate comprising the following: a first bipolar plate layer and a second bipolar plate layer which are in a contact area of the bipolar plate layers along a Connecting seam are cohesively connected to each other.
  • the present invention is based on the further object of creating a bipolar plate of the type mentioned above, in which the first bipolar plate layer and the second bipolar plate layer can be connected to one another in a process-safe manner, without the fluid mechanical properties of the bipolar plate being impaired and without the function of the support being impaired Bipolar plate adjacent components of electrochemical units are affected.
  • a bipolar plate wherein at least one support structure is formed on the first bipolar plate layer and / or on the second bipolar plate layer, a support surface of the at least one support structure opposite the surface of the bipolar plate layer on which the support structure is formed, in the contact area is offset along the stacking direction away from the other bipolar plate layer and wherein the at least one support structure has an edge on which the support structure merges into a flat area of the bipolar plate layer on which the support structure is formed, the smallest distance (i.e , d') of the edge of the support structure from the center line of the connecting seam is at most 0.8 mm, in particular at most 0.5 mm, particularly preferably at most 0.3 mm.
  • the smallest distance (d, d') of the edge of the support structure from the center line of the connecting seam is preferably taken perpendicular to the center line of the connecting seam.
  • the method according to the invention for materially connecting a first bipolar plate layer and a second bipolar plate layer of a bipolar plate can be used in particular for materially connecting the bipolar plate layers of the bipolar plate according to the invention.
  • the bipolar plate according to the invention can be produced in particular using the method according to the invention for materially connecting a first bipolar plate layer and a second bipolar plate layer of a bipolar plate.
  • the bipolar plate according to the invention is particularly suitable for use in an electrochemical device which comprises a plurality of electrochemical units which follow one another along a stacking direction and each comprise a bipolar plate according to the invention.
  • Such an electrochemical device can be, for example, a fuel cell device or an electrolyzer.
  • the electrochemical device can be designed as a polymer electrolyte membrane (PEM) fuel cell device.
  • PEM polymer electrolyte membrane
  • Fig. 1 is a top view of a bipolar plate for an electrochemical unit of an electrochemical device, which comprises a plurality of electrochemical units, which follow one another along a stacking direction, the bipolar plate having a first bipolar plate layer and a second bipolar plate layer, which are cohesively bonded in a contact area of the bipolar plate layers along a connecting seam are connected to each other, wherein at least one support structure is formed on the first bipolar plate layer and / or on the second bipolar plate layer, wherein a support surface of the at least one support structure opposite the surface of the bipolar plate layer on which the support structure is formed, in the contact area along Stacking direction is offset away from the other bipolar plate layer and wherein the at least one support structure has an edge on which the support structure merges into a flat area of the bipolar plate layer on which the support structure is formed, the smallest distance taken perpendicular to the center line of the connecting seam Edge of the support structure from the center line of the connecting seam is at most 0.8 mm, looking towards the an
  • Fig. 2 is a top view of a left end region of the bipolar plate from Fig. 1;
  • Fig. 3 is an enlarged view of area I from Fig. 2;
  • Fig. 4 is a partial, partially sectioned representation of the area of the bipolar plate from Fig. 3, cut along line 4 - 4 in Fig. 3;
  • FIG. 5 shows a partial top view of a connecting seam of the bipolar plate from FIG. 3 and support structures adjacent to the connecting seam;
  • Fig. 6 is a top view of the end region of the bipolar plate from Fig. 2, looking towards the cathode side of the bipolar plate;
  • Fig. 7 is an enlarged view of area II from Fig. 6;
  • FIG. 8 shows a partial longitudinal section through a web-shaped support structure of the bipolar plate, along line 8 - 8 in FIG. 7;
  • Fig. 9 is an enlarged view of area III from Fig. 6;
  • Fig. 10 is a schematic sectional view showing how a clamping force is applied to the first bipolar plate layer and the second bipolar plate layer by means of several clamping tools, the clamping tools being located on both sides of a connecting seam to be produced on a respective support structure of the first bipolar plate layer and on a respective support structure of the support second bipolar plate layer;
  • 11 shows a schematic longitudinal section through clamping tools, which are supported on cup-shaped support structures, which are formed on the first bipolar plate layer and on the second bipolar plate layer, and on flat regions of the first bipolar plate layer or the second bipolar plate layer lying between the support structures, along line 11 - 11 in Fig. 10;
  • FIG. 12 shows a schematic section corresponding to FIG. 10 through the bipolar plate layers and the clamping tools supported on support structures of the bipolar plate layers, whereby on the one in FIG.
  • FIG. 13 shows a schematic longitudinal section corresponding to FIG. 11 through the clamping tools and the support structures which are formed on the first bipolar plate layer, along the line
  • FIG. 14 shows a partial plan view of a medium distribution area of a second embodiment of a bipolar plate, with web-shaped support structures of a medium flow field running obliquely to sections of a connecting seam of the bipolar plate;
  • FIG. 15 is a top view of the back of the area of the bipolar plate from FIG. 14, with web-shaped support structures of a medium flow field running parallel to the sections of the connecting seam of the bipolar plate; and Fig. 16 shows a partial longitudinal section through the bipolar plate from Figs. 15 and 16, along line 16 - 16 in Fig. 14, the course of the sectional plane in Fig. 15 being indicated by line 16 ' - 16'.
  • an electrochemical unit 102 (not shown as a whole), which, in addition to the bipolar plate 100, can include a membrane-electrode arrangement, gas diffusion layers and a sealing arrangement.
  • a plurality of such electrochemical units 102 follow one another along a stacking direction 104 to form a stack of electrochemical units 102, which is a component of an electrochemical device 106, for example a fuel cell device.
  • the bipolar plate 100 has a substantially rectangular shape, with long sides 107 of the bipolar plate 100 extending along a longitudinal direction 108 and short sides 109 of the bipolar plate 100 extending along a transverse direction 110 of the bipolar plate 100.
  • the longitudinal direction 108 and the transverse direction 110 are preferably aligned perpendicular to each other and perpendicular to the stacking direction 104.
  • the longitudinal direction 108 is also referred to as the x direction
  • the transverse direction 110 is referred to as the y direction
  • the stacking direction 104 is referred to as the z direction.
  • the x-direction, the y-direction and the z-direction form a rectangular coordinate system.
  • the bipolar plate 100 has two end regions 112 and an electrochemically active region 114 located between the end regions 112.
  • the electrochemically active region 114 of the bipolar plate 100 comprises an anode gas flow field 116 through which an anode gas can flow, a cathode gas flow field 118 through which a cathode gas can flow, and a coolant flow field 120 through which a coolant can flow.
  • the bipolar plate 100 is designed in two layers and comprises a first bipolar plate layer 121 and a second bipolar plate layer 123.
  • the first bipolar plate layer 121 is an anode-side bipolar plate layer 122, on which the anode gas flow field 116 is formed
  • the second bipolar plate layer 123 is a cathode-side bipolar plate layer 124, on which the cathode gas flow field 118 is formed.
  • the first bipolar plate layer 121 can also be a cathode-side bipolar plate layer 124 and the second bipolar plate layer 123 can be an anode-side bipolar plate layer 122.
  • the bipolar plate layers 121 and 123 consist of a material with good electrical conductivity, preferably a metallic material.
  • the bipolar plate layers 121 and 123 are materially connected to one another along connecting seams 294, preferably welded, in particular by laser welding.
  • the anode flow field 116 of the bipolar plate 100 is in fluid communication with an anode-side electrode of a membrane-electrode arrangement - possibly via an anode-side gas diffusion layer.
  • the cathode flow field 118 of the bipolar plate 100 is in fluid communication with a cathode-side electrode of a membrane-electrode arrangement - possibly via a cathode-side gas diffusion layer.
  • Anode gas and cathode gas can thus reach the electrochemically active areas of a membrane-electrode arrangement from the electrochemically active area 114 of the bipolar plate 100. Therefore, the area of the bipolar plate 100 provided with the anode gas flow field 116 and the cathode gas flow field 118 is referred to as its electrochemically active area 114, although no electrochemical reactions take place on the bipolar plate 100 itself.
  • the anode gas flow field 116 includes anode gas flow channels 126, the main flow direction of which is aligned parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100.
  • the cathode gas flow field 118 includes cathode gas flow channels 128, the main flow direction of which extends parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100.
  • the bipolar plate 100 has a plurality of medium passage openings 130, through which a fluid medium (an anode gas (fuel gas, for example hydrogen), a cathode gas (oxidizing agent, for example oxygen or air) or a coolant (for example water)) can pass through the bipolar plate 100.
  • a fluid medium an anode gas (fuel gas, for example hydrogen), a cathode gas (oxidizing agent, for example oxygen or air) or a coolant (for example water)
  • the medium passage openings 130 of the stack of electrochemical units 102 successive Bipolar plates 100 and the spaces between the medium passage openings 130 in the stacking direction 104 together form a medium channel 132.
  • the fluid media pass through the anode gas flow field 116, the cathode gas flow field 118 and the coolant flow field 120 in the electrochemically active region 114 of the bipolar plate 100 from one end region 112 to the other end region 112.
  • An anode gas passage opening 134, a cathode gas passage opening 136 and a coolant passage opening 138 are arranged in the first end region 112a of the bipolar plate 100 shown in FIGS. 2 to 9.
  • each of these passage openings 134, 136 and 138 can serve either to supply the relevant medium to the electrochemical device 106 or to remove the relevant medium from the electrochemical device 106.
  • each of the three media anode gas, cathode gas and coolant can flow through the electrochemically active region 114 parallel to the other media or with the opposite main flow direction with respect to the main flow directions of one or two of the other media.
  • all passage openings 134, 136 and 138 arranged in the first end region 112a of the bipolar plate 100 supply the respective medium to the electrochemical device 106 and the passage openings 134, 136 and arranged in the second end region 112b of the bipolar plate 100 138 serve to remove the respective medium from the electrochemical device 106.
  • each of these passage openings is provided with a sealing bead 140.
  • the anode gas passage opening 134 is surrounded by an anode gas sealing bead 142.
  • the anode gas sealing bead 142 is provided on its inside facing the anode gas passage opening 134 with several anode gas inlets 144, through which anode gas from the anode gas passage opening 134 into the Interior of the anode gas sealing bead 142 can flow in (see Fig. 2).
  • the anode gas inlets 144 each open at an edge 146 of the anode gas passage opening 134.
  • the edge 146 of the anode gas passage opening 134 is square; However, the polygonal edge 146 of the anode gas passage opening 134 can also have more or fewer than four corners.
  • the corners of the anode gas passage opening 134 are preferably rounded in order to avoid tearing of the bipolar plate layers 122 and 124 in the area of these corners.
  • the anode gas sealing bead 142 is provided with several anode gas outlets 154 on its outside facing away from the anode gas passage opening 134.
  • the anode gas outlets 154 are preferably arranged on a section 156 of the anode gas sealing bead 142, which faces the electrochemically active region 114 of the bipolar plate 100.
  • the anode gas inlets 144 which are arranged on the same section 156 of the anode gas sealing bead 142, are preferably offset along the circumferential direction of the anode gas sealing bead 142 relative to the anode gas outlets 154.
  • the anode gas flows out through the anode gas outlets 154 on the section 156 of the anode gas sealing bead 142 into an anode gas distribution area 170, which serves to distribute the anode gas as evenly as possible to the anode gas flow channels 126 of the anode gas flow field 116.
  • the anode gas distribution area 170 each comprises a plurality of directional distribution structures 172 and a plurality of non-directional distribution structures 174, which serve to deflect the anode gas from its original flow direction.
  • the directed distributor structures 172 are designed, for example, as essentially linearly extending distributor webs 176.
  • the non-directional distributor structures 174 are designed, for example, as essentially cup-shaped distributor knobs 178.
  • the distributor structures 172 and 174 like all other structures of the bipolar plate 100 described above and below, are preferably formed in one piece with the material of the bipolar plate layers 121 or 123 and are inserted into the respective bipolar plate layer 121 or 123 by a forming process, for example by an embossing process or a Deep drawing process introduced.
  • the cathode gas passage opening 136 is surrounded by a cathode gas sealing bead 162.
  • the coolant passage opening 138 is surrounded by a coolant sealing bead 164.
  • a ring-shaped closed edge bead 182 runs around near the outer edge 180 of the bipolar plate 100.
  • the edge bead 182 encloses the electrochemically active region 114 of the bipolar plate 100, the anode gas passage openings 134 and the anode gas sealing beads 142 in both end regions 112, the cathode gas passage openings 136 and the cathode gas sealing beads 162 in both end regions 112 and the coolant Passage openings 138 and the coolant sealing beads 164 in both end regions 112 of the bipolar plate 100.
  • the edge bead 182 serves to prevent the media to be supplied to the electrochemical device 106, in particular the anode gas, the cathode gas and the coolant, from escaping from the electrochemical units 102 into the outer space 184 of the electrochemical device 106.
  • the cathode gas sealing bead 162 is provided with a plurality of cathode gas inlets 194 on its inside facing the cathode gas passage opening 136 (see in particular FIG. 6).
  • Cathode gas passes through the cathode gas inlets 194 from the cathode gas passage opening 136 into the interior of the cathode gas sealing bead 162.
  • the cathode gas inlets 194 preferably open at the edge 198 of the cathode gas passage opening 136.
  • the edge 198 of the cathode gas passage opening 136 is square.
  • the number of corners of the polygonal edge 198 can also be smaller or larger than four.
  • Cathode gas outlets 214 which are arranged on the outside of the cathode gas sealing bead 162 facing away from the cathode gas passage opening 136 and through which the cathode gas flows out of the interior of the cathode gas sealing bead 162, are preferably all arranged on a section 200 of the cathode gas sealing bead 162, which the electrochemically active region 114 of the bipolar plate 100 faces.
  • the cathode gas inlets 194, which are arranged on the same section 200 of the cathode gas sealing bead 162, are arranged offset along the circumferential direction of the cathode gas sealing bead 162 relative to the cathode gas outlets 214.
  • cathode gas outlets 214 are provided on the cathode gas sealing bead 162.
  • the cathode gas flows through the cathode gas outlets 214 into a cathode gas distribution region 216 of the bipolar plate 100, which serves to distribute the cathode gas as evenly as possible to the cathode gas flow channels 128 of the cathode gas flow field 118.
  • the cathode gas distribution area includes distribution structures 218, which are designed as directional distribution structures 220 or as non-directional distribution structures 221.
  • the directed distributor structures 220 are preferably designed as linearly extending distributor webs 222.
  • the non-directional distributor structures 221 are designed, for example, as essentially cup-shaped distributor knobs 223.
  • the coolant sealing bead 164 is provided with a plurality of coolant inlets 224 on its inside facing the coolant passage opening 138 (see in particular FIGS. 2 and 6).
  • the coolant passes through the coolant inlets 224 from the coolant passage opening 138 into the interior of the coolant sealing bead 164.
  • the edge 228 of the coolant passage opening 138 is square in the embodiment shown in the drawing. However, the number of corners of the polygonal edge 228 of the coolant passage opening 138 can also be larger or smaller than four.
  • Coolant outlets 225 which are arranged on the outside of the coolant sealing bead 164 facing away from the coolant passage opening 138 and through which the coolant flows out of the interior of the coolant sealing bead 164, are preferably all arranged on a section 230 of the coolant sealing bead 164, which the electrochemically active region 114 of the bipolar plate 114 faces.
  • the coolant inlets 224 which are arranged on the same section 230 of the coolant sealing bead 164, are arranged offset along the circumferential direction of the coolant sealing bead 164 relative to the coolant outlets 225.
  • the coolant flows through the coolant outlets 225 into a coolant distribution area 242 of the bipolar plate 100, which serves to distribute the coolant as evenly as possible across the coolant flow channels of the coolant flow field.
  • the anode-side bipolar plate layer 122 and the cathode-side bipolar plate layer 124 are offset in opposite directions along the stacking direction 104 relative to a longitudinal center plane of the bipolar plate 100 that is oriented perpendicular to the stacking direction 104, so that the flow of the coolant through the coolant distribution area 242 a large flow-through cross-section is available.
  • the bipolar plate 100 is preferably designed to be rotationally symmetrical with respect to a rotation of 180° about an axis of rotation running through the center of the electrochemically active region 114 of the bipolar plate 100 and parallel to the stacking direction 104 (z direction).
  • the medium passage openings 130 arranged in the second end region 112b, in particular the anode gas passage opening 134 arranged there, the cathode gas passage opening 136 arranged there and the coolant passage opening 138 arranged there, are therefore preferably constructed and arranged in essentially the same way as the anode gas passage opening 134, the cathode gas passage opening 136 and the coolant passage opening 138 in the first end region 112a, which have been described above.
  • bipolar plate 100 described above and shown in FIGS Media to be supplied (anode gas, cathode gas, coolant) passes through gaps between the first bipolar plate layer 121 and the second bipolar plate layer 123 to a medium passage opening 130 of another medium or into a medium distribution area or into a medium flow field of another medium.
  • Such connecting seams 294, at which the first bipolar plate layer 121 and the second bipolar plate layer 123 are connected to one another in a materially bonded manner, preferably by welding, in particular by laser welding, are, for example, in the area between the outside of the anode gas sealing bead 142 on the one hand and the anode gas distribution area 170 on the other ( see in particular FIGS. 3 to 5) and between the cathode gas sealing bead 162 on the one hand and the cathode gas distribution area 216 on the other hand (see in particular FIG. 9) and between the anode gas sealing bead 142 on the one hand and the coolant distribution area 242 on the other hand (see in particular Fig. 7) arranged.
  • support structures 296 are preferably formed on both sides of the connecting seam 294, which serve during the production of the connecting seam 294 to support clamping tools which are in contact with support surfaces 298 of the support structures 296 and optionally also are in contact with flat contact areas 300 of the bipolar plate layers 121, 123 lying between the support structures 296 in order to press the first bipolar plate layer 121 and the second bipolar plate layer 123 against each other with a sufficient clamping force during the connection process, in particular a welding process.
  • This ensures that at most a “technical zero gap” of less than 0.03 mm in height (along the stacking direction 104) remains between the two bipolar plate layers 121, 123 before the connection process.
  • the support structures 296 are formed on the side of the connecting seam 294 facing the sealing bead 140 (anode gas sealing bead 142) by the previously mentioned non-directional distributor structures 174 in the form of distributor knobs 178.
  • cup-shaped support structures 302 each have a support surface 298, which is aligned perpendicular to the stacking direction 104 (z-direction) of the bipolar plate 100 and in the plane relative to the surface 299 of the first bipolar plate layer 121, on which these cup-shaped support structures 302 are formed by forming Contact area 300, in which the two bipolar plate layers 121 and 123 lie flat against one another, is offset away from the second bipolar plate layer 123 along the stacking direction 104 (z-direction) of the bipolar plate 100.
  • the support surface 298 of the cup-shaped support structures 302 preferably has a smallest extent a perpendicular to the stacking direction 104 (z-direction) of the bipolar plate 100, which is at least 0.1 mm, in particular at least 0.5 mm. Furthermore, the smallest extent a of the support surfaces 298 of these cup-shaped support structures 302 perpendicular to the stacking direction 104 (z-direction) of the bipolar plate 100 is preferably at most 3 mm, in particular at most 1.5 mm.
  • each of the cup-shaped support structures 302 has an edge 304, on which the relevant support structure 302 merges into a flat area of the first bipolar plate layer 121, on which the support structures 302 are formed, the - taken perpendicular to the center line 306 of the connecting seam 294 - the smallest distance d of the edge 304 of the respective support structure 296 from the center line 306 of the connecting seam 294 is at most 0.8 mm, in particular at most 0.5 mm, particularly preferably at most 0.3 mm.
  • the greatest distance D of the edge 304 of the respective support structure 296 from the center line 306 of the connecting seam 294 - taken perpendicular to the center line 306 of the connecting seam 294 - is preferably at most 5 mm, in particular at most 3 mm, particularly preferably at most 2 mm.
  • the support structures 296 are formed on the side of the connecting seam 294 facing away from the sealing bead 140 (anode gas sealing bead 142) by the directed distribution structures 172 of the anode distribution region 170 in the form of the distribution webs 176.
  • These web-shaped support structures 308 also each include a support surface 298, the smallest extent a 'perpendicular to the stacking direction 104 (z-direction) of the bipolar plate 100 is preferably at least 0.1 mm, in particular at least 0.5 mm.
  • the web-shaped support structures 308 have their greatest extent perpendicular to the stacking direction 104 (z direction) of the bipolar plate 100 along their longitudinal direction 310, and this greatest extent is preferably greater than 3 mm, in particular greater than 5 mm.
  • the web-shaped support structures 308 run transversely to the connecting seam 294, and their ends 292 facing the sealing bead 140 (anode gas sealing bead 142) are preferably at a distance d' from the center line 306 of the connecting seam 294 - taken perpendicular to the center line 306 of the connecting seam 294. which is less than 0.8 mm, in particular less than 0.5 mm, particularly preferably less than 0.3 mm.
  • the ends 292 of the web-shaped support structures 308 lie on an edge 312 of the respective support structure 296, on which the support structure 296 merges into a flat area of the first bipolar plate layer 121, on which the support structure 296 is formed, the - perpendicular to the center line 306 of the connecting seam 294 - the smallest distance d' of the edge 312 of the support structure 296 from the center line 306 of the connecting seam 294 is preferably at most 0.8 mm, in particular at most 0.5 mm, particularly preferably at most 0.3 mm.
  • adjacent components of electrochemical units 102 for example gas diffusion layers or sub-gaskets of membrane electrode units of electrochemical units 102, are supported on the support surfaces 298 of the support structures 296.
  • the distances between these support surfaces 298 should therefore not be too large in order to avoid that these neighboring components of electrochemical units 102 sag in the areas between the support surfaces 298 and reduce the flow-through cross sections present there.
  • a method for materially connecting the first bipolar plate layer 121 and the second bipolar plate layer 123 is explained below with reference to FIGS. 10 and 11.
  • cup-shaped support structures 302 are formed on the first bipolar plate layer 121 on both sides of the connecting seam 294 to be produced and at positions that correspond to the positions of the cup-shaped support structures 302 on the first bipolar plate layer 121 are essentially congruent or are only slightly offset from these positions, cup-shaped support structures 302 'are also arranged on the second bipolar plate layer 123.
  • first bipolar plate layer 121 and the second bipolar plate layer 123 are arranged so that they are in contact with one another, preferably flatly, at one or more contact areas 300.
  • a clamping force is applied to the first bipolar plate layer 121 and the second bipolar plate layer 123, through which the first bipolar plate layer 121 and the second bipolar plate layer 123 are pressed against each other in the contact areas 300, so that at most a " “technical zero gap” with a height (extension along the stacking direction 104) of less than 0.03 mm remains.
  • the clamping tools 316 rest on support surfaces 298 of the support structures 296, which are offset from the surface 299 of the bipolar plate layer 121, on which the support structures 296 are formed, in the contact areas 300 by a height H along the stacking direction 104 away from the other bipolar plate layer 123 .
  • the smallest distances d, d' of the edges 304, 304' of the support structures 296, 296' from the center line 306 of the connecting seam 294 to be produced are so small, preferably at most 0.8 mm, in particular at most 0.5 mm, particularly preferably at most 0 .3 mm that the clamping forces introduced along the edges 304, 304' into the contact areas 300 of the bipolar plate layers 121, 123 are sufficiently high to produce a stable clamping effect between the bipolar plate layers 121 and 123 in the flat contact areas 300.
  • the clamping tools 316, 316 ' which in the exemplary embodiment shown are designed as clamping webs 318 extending in a longitudinal direction, lie both on the support surfaces 298 of the support structures 296 and in the Areas between two support structures 296, which follow each other along the longitudinal direction of a clamping tool 316, 316 ', on a flat contact area 300 of the first bipolar plate layer 121 or the second bipolar plate layer 123 in order to transmit clamping forces to the bipolar plate layers 121, 123 on these surfaces.
  • the first bipolar plate layer 121 and the second bipolar plate layer 123 are materially connected to one another along the connecting seam 294, preferably by welding, for example by laser welding.
  • a laser for producing a connecting seam 294 by means of laser welding can be arranged on the side of the first bipolar plate layer 121 facing away from the second bipolar plate layer 123 or on the side of the second bipolar plate layer 123 facing away from the first bipolar plate layer 121.
  • the clamping tools 316, 316 ' are released from the bipolar plate layers 121, 123.
  • a second embodiment of a method for materially connecting the first bipolar plate layer 121 and the second bipolar plate layer 123 shown in FIGS. 12 and 13 differs from the first embodiment shown in FIGS. 10 and 11 in that on the second bipolar plate layer 123 to the left of the No support structures 296' are provided for a clamping tool 316' in the connecting seam 294 to be created, but instead the clamping tool 316' rests against a flat area of the second bipolar plate layer 123 in this area. As can be seen from the longitudinal section of FIG. 13, this clamping tool 316' therefore has the same cross-section everywhere in its longitudinal direction and thus has an essentially cuboid shape overall.
  • the cathode gas sealing bead 162 is also surrounded by a closed connecting seam 294.
  • support structures 296 are provided on both sides of the connecting seam 294 for supporting clamping tools 316 during the creation of the connecting seam 294.
  • the support structures 296, which are arranged on the side of the connecting seam 294 facing the sealing bead 140 (cathode gas sealing bead 162), are designed as cup-shaped support structures 302 molded into the second bipolar plate layer 123, while those on the sealing bead 140 (cathode gas sealing bead 162 ) opposite side of the connecting seam 294 arranged support structures 296 are formed as web-shaped support structures 308 molded into the second bipolar plate layer 123, the longitudinal direction 310 of which runs transversely to the center line 306 of the connecting seam 294.
  • the longitudinal direction 310 includes an angle a of more than 75°, in particular more than 80°, with the center line 306 of the connecting seam 294.
  • the support structures 296 on the two sides of the connecting seam 294 surrounding the cathode gas sealing bead 162 correspond in terms of structure, function and method of manufacture to the supporting structures 296 on the two sides of the connecting seam 294 surrounding the anode gas sealing bead 142, with reference to the above description in this respect is taken.
  • the method for cohesively connecting the first bipolar plate layer 121 and the second bipolar plate layer 123 along the connecting seam 294, which surrounds the cathode gas sealing bead 162, agrees - except for the swapping of the first bipolar plate layer 121 and the second bipolar plate layer 123 with each other - with that referred to above 10 to 13, the above description of which is referred to in this respect.
  • a support structure 296 is provided on the cathode side of the bipolar plate 100 along the connecting seam 294 surrounding the anode gas sealing bead 142, on the side facing away from the sealing bead (anode gas sealing bead 142). extends parallel to the connecting seam 294.
  • This web-shaped support structure 308 can also be used to support a clamping tool 316 during the creation of the connecting seam 294.
  • FIG. 14 to 16 show a second embodiment of a bipolar plate 100, in which a connecting seam 294, along which a first bipolar plate layer 121 and a second bipolar plate layer 123 are cohesively connected to one another, runs at least in sections parallel to a bead 320, on which the connecting seam 294 facing flank 322 several medium outlet openings 324 are arranged.
  • a medium flow field 326 is arranged, which has webs 328 which run at an angle of approximately 45 ° with respect to the longitudinal direction of the connecting seam 294.
  • a medium flow channel 330 is formed between two webs 328, into which medium flowing out of the medium outlet openings 324 of the bead 320 flows.
  • the medium flow field 326 shown in FIG. 14 can be, for example, the anode gas flow field 116 of the bipolar plate 100.
  • FIG. 15 shows the back of the bipolar plate 100 in the area shown in FIG. 14 and thus a medium flow field 326 ', which is assigned to another medium that is to be supplied to the electrochemical device 106.
  • FIG. 14 shows the anode gas flow field 116
  • FIG. 15 shows the cathode gas flow field 118 of the bipolar plate 100.
  • the anode side and the cathode side of the bipolar plate 100 can also be swapped with one another.
  • the webs 328 of the medium flow field 326 ' run at least in sections parallel to the connecting seam 294.
  • the medium channels 330 'of the medium flow field 326' and the medium channels 330 of the medium flow field 326 therefore cross each other, whereby a sequence of local support centers 332 is formed parallel to the connecting seam 294, at which the first bipolar plate layer 121 and the second bipolar plate layer 123 are support each other so that at these local Support centers 332 can establish a balance of forces when the bipolar plate layers 121 and 123 are pressed and elevations adjacent to these local support centers 332 in the first bipolar plate layer 121 or second bipolar plate layer 123 can serve as support structures 296 for supporting clamping tools 316 (see Fig. 16).

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  • Sustainable Energy (AREA)
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  • General Chemical & Material Sciences (AREA)
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Abstract

L'invention vise à mettre au point un procédé permettant d'assembler par liaison de matière une première couche de plaque bipolaire et une seconde couche de plaque bipolaire d'une plaque bipolaire pour une unité électrochimique d'un dispositif électrochimique, lequel comprend plusieurs unités électrochimiques se succédant le long d'une direction d'empilage, ledit procédé comprenant les étapes suivantes : mettre en contact la première couche de plaque bipolaire et la seconde couche de plaque bipolaire en une ou en plusieurs zones de contact des couches de plaques bipolaires, appliquer une force de serrage sur la première couche de plaque bipolaire et la seconde couche de plaque bipolaire au moyen d'un ou de plusieurs outils de serrage, et relier par liaison de matière la première couche de plaque bipolaire et la seconde couche de plaque bipolaire le long d'un cordon de liaison, ledit procédé devant permettre d'assembler les deux couches de plaque bipolaire de manière fiable, sans détériorer les propriétés d'écoulement fluidique de la plaque bipolaire ou sans altérer la fonction de support de la plaque bipolaire pour des composants des unités électrochimiques du dispositif électrochimique. A cet effet, selon l'invention, au moins un outil de serrage est soutenu au niveau d'une surface d'appui d'au moins une structure de support d'au moins une des couches de plaque bipolaire, la surface d'appui de la structure de support étant décalée dans chaque cas de l'autre couche de plaque bipolaire par rapport à la surface de la couche de plaque bipolaire sur laquelle la structure de support est réalisée, dans la zone de contact le long de la direction d'empilage.
EP23748005.8A 2022-08-01 2023-07-17 Procédé d'assemblage par liaison de matière d'une première couche de plaque bipolaire et d'une seconde couche de plaque bipolaire, plaque bipolaire pour une unité électrochimique d'un dispositif électrochimique et dispositif électrochimique Pending EP4566103A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022119222.9A DE102022119222A1 (de) 2022-08-01 2022-08-01 Verfahren zum stoffschlüssigen Verbinden einer ersten Bipolarplattenlage und einer zweiten Bipolarplattenlage, Bipolarplatte für eine elektrochemische Einheit einer elektrochemischen Vorrichtung und elektrochemische Vorrichtung
PCT/EP2023/069824 WO2024028095A2 (fr) 2022-08-01 2023-07-17 Procédé d'assemblage par liaison de matière d'une première couche de plaque bipolaire et d'une seconde couche de plaque bipolaire, plaque bipolaire pour une unité électrochimique d'un dispositif électrochimique et dispositif électrochimique

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EP4566103A2 true EP4566103A2 (fr) 2025-06-11

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EP23748005.8A Pending EP4566103A2 (fr) 2022-08-01 2023-07-17 Procédé d'assemblage par liaison de matière d'une première couche de plaque bipolaire et d'une seconde couche de plaque bipolaire, plaque bipolaire pour une unité électrochimique d'un dispositif électrochimique et dispositif électrochimique

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US (1) US20250174681A1 (fr)
EP (1) EP4566103A2 (fr)
CN (1) CN119522494A (fr)
DE (1) DE102022119222A1 (fr)
WO (1) WO2024028095A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024107605A1 (de) * 2024-03-18 2025-09-18 Ekpo Fuel Cell Technologies Gmbh Plattenelement, Bipolarplatte, Plattenanordnung und elektrochemisches System
DE102024111490A1 (de) * 2024-04-24 2025-10-30 Schaeffler Technologies AG & Co. KG Bipolarplatte, Plattenanordnung und Elektrolyseur
DE102024123593A1 (de) * 2024-08-19 2026-02-19 Ekpo Fuel Cell Technologies Gmbh Bipolarplatte für eine elektrochemische Vorrichtung

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EP1826850A2 (fr) * 2006-02-25 2007-08-29 Behr GmbH & Co. KG Procédé d'assemblage de plaques bipolaires, en particulier pour un empilement de piles à combustible d'un véhicule automobile
CN102668205B (zh) 2009-10-02 2014-11-19 myFC股份公司 燃料电池组件
DE202020100346U1 (de) * 2020-01-23 2021-04-26 Reinz-Dichtungs-Gmbh Separatorplattenanordnung für ein elektrochemisches System
DE102020208927A1 (de) * 2020-07-16 2022-01-20 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren und System zum Verbinden von plattenförmigen Bauteilen einer Bipolarplatte
CN214978498U (zh) 2020-10-21 2021-12-03 湖南理工学院 一种基于电磁工作台的金属双极板焊接夹具
CN215658498U (zh) 2020-10-21 2022-01-28 湖南理工学院 一种燃料电池金属双极板激光焊接夹具

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US20250174681A1 (en) 2025-05-29
WO2024028095A3 (fr) 2024-03-28
DE102022119222A1 (de) 2024-02-01
CN119522494A (zh) 2025-02-25

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