EP4566104A1 - Plaque bipolaire pour unité électrochimique d'appareil électrochimique, et appareil électrochimique - Google Patents

Plaque bipolaire pour unité électrochimique d'appareil électrochimique, et appareil électrochimique

Info

Publication number
EP4566104A1
EP4566104A1 EP23748441.5A EP23748441A EP4566104A1 EP 4566104 A1 EP4566104 A1 EP 4566104A1 EP 23748441 A EP23748441 A EP 23748441A EP 4566104 A1 EP4566104 A1 EP 4566104A1
Authority
EP
European Patent Office
Prior art keywords
medium
bipolar plate
sealing bead
passage opening
flow
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
EP23748441.5A
Other languages
German (de)
English (en)
Inventor
Michael Schaich
Joachim Scherer
Leander Hess
Simon Grünenwald
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 EP4566104A1 publication Critical patent/EP4566104A1/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
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—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
    • H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
    • 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

  • Bipolar plate for an electrochemical unit of an electrochemical device and electrochemical device
  • the present invention 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: at least one medium passage opening, which forms part of a medium channel extends along the stacking direction through the electrochemical device; a sealing bead which extends around the medium passage opening; a plurality of medium inlets which are arranged on an inside of the sealing bead facing the medium passage opening and enable medium to flow into the interior of the sealing bead; and a plurality of medium outlets, which are arranged on an outside of the sealing bead facing away from the medium passage opening and enable medium to flow out of the interior of the sealing bead.
  • the medium inlets and the medium outlets, through which the interior of the sealing bead is in fluid communication with the medium passage opening or with the external space surrounding the sealing bead, are also referred to as gas ports.
  • medium inlets and medium outlets or gas ports are arranged on the flanks of the sealing bead and enable the respective medium to pass from the respective medium channel into a medium distribution area and from there into a medium flow field of the bipolar plate.
  • medium inlets and medium outlets or gas ports are arranged on the flanks of the sealing bead and enable the respective medium to pass from the respective medium channel into a medium distribution area and from there into a medium flow field of the bipolar plate.
  • the present invention is based on the object of creating a bipolar plate of the type mentioned at the outset, in which the pressure loss that occurs during the flow of the medium from the medium passage opening through the medium inlets, the interior of the sealing bead and the medium outlets is as possible as possible is low, with the medium preferably flowing out of the medium outlets as evenly as possible over a medium inlet area of a medium distribution area.
  • the flow-through cross sections of the medium inlets and the medium outlets are taken along a plane which is aligned parallel to the stacking direction and perpendicular to the average flow direction of the medium through the relevant medium inlet or medium outlet.
  • the solution according to the invention is based on the concept of overfilling the interior of the sealing bead with the relevant medium. Since the flow-through cross-section of the interior of the sealing bead itself is significantly larger than the flow-through cross-section of the medium inlets and medium outlets, the flow resistance within the sealing bead hardly contributes to the pressure drop in the medium as it flows from the medium passage opening to the outside of the sealing bead. By increasing the total cross-section of the medium inlets that can flow through, a maximum medium flow is achieved at the medium outlets on the outside of the sealing bead.
  • the average flow velocity when flowing through the medium inlets becomes lower, which reduces the pressure drop in the medium at the medium inlets and also reduces the overall pressure drop when the medium passes through from the medium passage opening to the outside of the sealing bead.
  • the total pressure drop is then essentially determined by the flow resistance of the medium outlets.
  • the total cross section of the medium inlets through which flow is at least 15%, particularly preferably at least 20%, larger than the entire cross section of the medium outlets through which flow can flow.
  • the flow-through cross-section of the medium inlets can be influenced by the choice of the number of medium inlets and by the choice of the size of the flow-through cross-sectional area of the medium inlets.
  • the entire cross-section of the medium outlets that can be flowed through can be influenced by the choice of the number of medium outlets and by the choice of the size of the cross-sectional area of the medium outlets that can be flowed through.
  • the number of medium inlets is greater than the number of medium outlets, each on the same sealing bead.
  • the average flow-through cross section of a medium inlet can, for example, be essentially the same size as the average flow-through cross section of a medium outlet.
  • the number of medium inlets is two or more larger than the number of medium outlets.
  • the medium inlets are preferably arranged offset from the medium outlets along the circumference of the sealing bead.
  • the bipolar plate comprises an electrochemically active region, which comprises an anode gas flow field through which an anode gas can flow, a cathode gas flow field through which a cathode gas can flow, and a coolant flow field through which a coolant can flow, wherein the bipolar plate comprises a medium distribution area, via which the medium passage opening is in fluid communication with the electrochemically active area of the bipolar plate.
  • Anode gas travels from the anode gas flow field of the electrochemically active region - possibly through a gas diffusion layer on the anode side - to an anode of a membrane-electrode arrangement. From the cathode gas flow field of the electrochemically active region, cathode gas passes - possibly through a gas diffusion layer on the cathode side - to a cathode of a membrane-electrode arrangement.
  • the area of the bipolar plate comprising the anode gas flow field and the cathode gas flow field is therefore referred to as its electrochemically active area, although no electrochemical reactions take place on the bipolar plate itself.
  • At least one medium outlet is arranged and aligned on the sealing bead in such a way that the medium flows out of the medium outlet directed towards a medium inlet area of the medium distribution area.
  • a plurality of medium outlets are arranged on a distribution area section of the sealing bead, which lies opposite a medium inlet area of the medium distribution area. It is particularly advantageous if all medium outlets of a sealing bead are arranged on the distribution area section of the sealing bead, which lies opposite the medium inlet area of the medium distribution area.
  • At least one medium inlet is preferably arranged outside the distribution area section of the sealing bead on the sealing bead.
  • At least two medium inlets in particular at least three medium inlets, particularly preferably at least four medium inlets, are arranged outside the distribution area section of the sealing bead on the sealing bead.
  • all medium outlets are arranged on a medium outlet section of the sealing bead, which begins at a first outer medium outlet and ends at a second outer medium outlet. All other medium outlets are then distributed along the circumference of the sealing bead between the first outer medium outlet and the second outer medium outlet.
  • At least two medium inlets are arranged outside the medium outlet section of the sealing bead on the sealing bead.
  • a longitudinal direction of the bipolar plate preferably runs parallel to a main flow direction of the medium through a medium flow field of the bipolar plate assigned to the medium. It is preferably at least a medium inlet is arranged and aligned on the sealing bead in such a way that the medium flows through the medium inlet into the interior of the sealing bead essentially perpendicular to the longitudinal direction of the bipolar plate.
  • the longitudinal direction of the bipolar plate is preferably aligned parallel to the long sides of a substantially rectangular bipolar plate - seen in a top view along the stacking direction.
  • the flow-through cross section of the sealing bead is preferably larger than the average flow-through cross section of a medium flow channel of a medium flow field of the bipolar plate assigned to the medium.
  • the medium passage opening for whose assigned sealing bead it applies that the total flow-through cross-section of the medium inlets is at least 10% larger than the total flow-through cross-section of the medium outlets, can be an anode gas passage opening, a cathode gas passage opening or a coolant passage opening Be bipolar plate.
  • the total flow-through cross-section of the medium inlets at the respective assigned sealing bead is at least 10% larger than the total flow-through area Cross section of the medium outlets.
  • an anode gas passage opening, a cathode gas passage opening and a coolant passage opening of the bipolar plate are all surrounded by a sealing bead on which medium inlets and medium outlets are arranged, the entire flow-through cross section of the medium inlets at each of these sealing beads is larger by at least 10%, in particular by at least 15%, particularly preferably by at least 20%, than the entire flow-through cross section of the medium outlets at the respective sealing bead.
  • the bipolar plate according to the invention is particularly suitable for use as a component of an electrochemical device which comprises several 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 is designed as a polymer electrolyte membrane (PEM) fuel cell device.
  • PEM polymer electrolyte membrane
  • Fig. 1 is a plan view of an end region of a bipolar plate for an electrochemical unit of an electrochemical device, which comprises a plurality of electrochemical units, which are longitudinal follow one another in a stacking direction, wherein the bipolar plate has a plurality of medium passage openings, each of which forms part of a medium channel which extends along the stacking direction through the electrochemical device, a sealing bead in each case, which extends around the medium passage opening, several in each case Medium inlets, which are arranged on an inside of the sealing bead facing the medium passage opening and enable medium to flow into the interior of the sealing bead, and each a plurality of medium outlets, which are arranged on an outside of the sealing bead facing away from the medium passage opening and enable medium to flow out of the interior of the sealing bead, wherein the total flow-through cross-section of the medium inlets on a sealing bead is at least 10% larger than the total flow-through cross-section of the medium outlets on the same sealing bead, with the viewing direction towards
  • Fig. 2 is a top view of the end region of the bipolar plate from Fig. 1, looking towards the anode side of the bipolar plate;
  • FIGS. 1 and 2 shows a plan view of the inside of the end region of an anode-side bipolar plate layer of the bipolar plate from FIGS. 1 and 2;
  • Identical or functionally equivalent elements are designated with the same reference numerals in all figures. 1 to 4, designated as a whole by 100, forms a component of 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 an anode-side bipolar plate layer 122, on which the anode gas flow field 116 is formed, and a cathode-side bipolar plate layer 124, on which the cathode gas flow field 118 is formed.
  • the bipolar plate layers 122 and 124 consist of a material that has good electrical conductivity, preferably a metallic material.
  • the bipolar plate layers 122 and 124 are materially connected to one another along joining lines (not shown in the drawing), 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, with the anode gas flow field 116 and the cathode gas flow field 118 provided area of the bipolar plate 100 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 bipolar plates 100 successive in the stack of electrochemical units 102 and the spaces between the medium passage openings 130 in the stacking direction 104 together each 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. 1 to 4.
  • 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 112 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 anode gas inlets 144 each open at a rectilinear edge section 148, 150 or 152 of the anode gas passage opening 134.
  • the rectilinear edge section 148 runs obliquely to the longitudinal direction 108 (x direction) of the bipolar plate 100 and obliquely to the transverse direction 110 (y direction) of the bipolar plate 100 and preferably faces the electrochemically active region 114 of the bipolar plate 100.
  • anode gas inlets through which the anode gas flows into the interior of the anode gas sealing bead 142, preferably perpendicular to the longitudinal direction 108 (x direction) of the bipolar plate 100.
  • the rectilinear edge section 150 preferably runs essentially parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100 and preferably faces the coolant passage opening 138.
  • One or more anode gas inlets 144 open at the edge section 150, in the exemplary embodiment shown two anode gas inlets 144.
  • the rectilinear edge section 152 preferably runs essentially parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100 and is preferably facing away from the coolant passage opening 138.
  • One or more anode gas inlets 144 in the exemplary embodiment shown, preferably open at the edge section 152, two anode gas inlets 144, through which the anode gas preferably flows into the interior of the anode gas sealing bead 142 perpendicular to the longitudinal direction 108 (x direction) of the bipolar plate 100.
  • edge 146 of the anode gas passage opening 134 comprises a rectilinear edge section 153, which is preferably aligned obliquely to the longitudinal direction 108 (x direction) of the bipolar plate 100 and obliquely to the transverse direction 110 (y direction) of the bipolar plate 100 and preferably to the electrochemically active Area 114 of the bipolar plate 100 faces away.
  • no anode gas inlet 144 opens at the edge section 153.
  • edge sections 148, 150, 152 and 153 form a polygonal 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 section 156 of the anode gas sealing bead 142 preferably runs essentially parallel to the rectilinear edge section 148 of the edge 146 of the anode gas passage opening 134 and essentially parallel to the rounded corner regions 157a and 157b of the edge 146, which connect the rectilinear edge section 148 with the edge section 150 or connect to the edge section 152.
  • anode gas outlets 154 are preferably arranged on section 156.
  • 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 sealing bead 142 includes further sections 158a, 158b and 160, which are each essentially parallel to the straight-line edge sections 150 and 152 running parallel to the longitudinal direction 108 of the bipolar plate 100 or substantially parallel to the straight-line edge section facing away from the electrochemically active region 114 153 of the edge 146 of the anode gas passage opening 134 are aligned.
  • 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 are preferably formed in one piece with the material of the bipolar plate layers 122 or 124 and are inserted into the respective bipolar plate layer 122 or 124 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. 1).
  • 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 straight edge sections 196, 202 and 204 of the edge 198 of the cathode gas passage opening 136.
  • the rectilinear edge section 196 preferably runs obliquely to the longitudinal direction 108 (x direction) of the bipolar plate 100 and obliquely to the transverse direction 110 (y direction) of the bipolar plate 100 and preferably faces the electrochemically active region 114 of the bipolar plate 100.
  • the rectilinear edge section 202 preferably runs essentially parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100 and preferably faces the coolant passage opening 138.
  • One or more cathode gas inlets 194 in the exemplary embodiment shown, preferably open at the edge section 202, two cathode gas inlets 194, through which the cathode gas preferably flows into the interior of the cathode gas sealing bead 162 perpendicular to the longitudinal direction 108 (x direction) of the bipolar plate 100.
  • the rectilinear edge section 204 preferably runs essentially parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100 and preferably faces the edge bead 182.
  • One or more cathode gas inlets 194 in the exemplary embodiment shown, preferably open at the edge section 204, two cathode gas inlets 194, through which the cathode gas preferably flows into the interior of the cathode gas sealing bead 162 perpendicular to the longitudinal direction 108 (x direction) of the bipolar plate 100.
  • the edge 198 of the cathode gas passage opening 136 can comprise a rectilinear edge section 206 which runs essentially parallel to the transverse direction 110 (y direction) of the bipolar plate 100 and preferably faces away from the electrochemically active region 114 of the bipolar plate 100.
  • the edge sections 196, 202, 204 and 206 form a polygonal 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 are arranged on the outside of a section 200 of the cathode gas sealing bead 162, which is essentially parallel to the rectilinear edge section 196 of the edge 198 of the cathode gas passage opening 136 and runs substantially parallel to the rounded corner regions 201a and 201b of the edge 198, which connect the rectilinear edge section 196 with the edge section 202 and with the edge section 204, respectively.
  • the cathode gas sealing bead 162 includes further sections 208, 210 and 212, which are each essentially parallel to the straight edge sections 202 and 204 that run parallel to the longitudinal direction 108 of the bipolar plate 100 or substantially parallel to the straight edge section facing away from the electrochemically active region 114 206 of the edge 198 of the cathode gas passage opening 136 are aligned.
  • the cathode gas outlets 214 are preferably all arranged on the section 200 of the cathode gas sealing bead 162, which faces the electrochemically active region 114 of the bipolar plate 100.
  • 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 FIG. 1).
  • the coolant passes through the coolant inlets 224 from the coolant passage opening 138 into the interior of the coolant sealing bead 164.
  • the coolant inlets 224 preferably open at straight edge sections 226, 232a and 232b of the edge 228 of the coolant passage opening 138.
  • the rectilinear edge section 226 preferably runs essentially parallel to the transverse direction 110 (y-direction) of the bipolar plate 100 and preferably faces the electrochemically active region 114 of the bipolar plate 100.
  • the rectilinear edge section 232a preferably runs essentially parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100 and preferably faces the anode gas passage opening 134.
  • the rectilinear edge section 232b preferably runs essentially parallel to the longitudinal direction 108 (x direction) of the bipolar plate 100 and preferably faces the cathode gas passage opening 136.
  • the edge 228 of the coolant passage opening 138 can comprise a rectilinear edge section 234 which runs essentially parallel to the transverse direction 110 (y-direction) of the bipolar plate 100 and preferably faces away from the electrochemically active region 114 of the bipolar plate 100.
  • no coolant inlet 224 opens at the edge section 234.
  • the edge sections 226, 232a, 232b and 234 together form a polygonal edge 228 of the coolant passage opening 138, which is square in the embodiment shown in the drawing.
  • 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 are arranged on a section 230 of the coolant sealing bead 164, which is essentially parallel to the rectilinear edge section 226 of the edge 228 of the coolant passage opening 138 and in Essentially parallel to the rounded corner regions 231a and 231b of the edge 228, which connect the straight edge section 226 with the edge section 232a and with the edge section 232b, respectively.
  • the section 200 of the coolant sealing bead 164 preferably faces the electrochemically active region 114 of the bipolar plate 100.
  • 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 sealing bead 164 preferably includes further sections 238a, 238b and 240, which are each aligned essentially parallel to the edge sections 232a, 232b and 234 of the edge 228 of the coolant passage opening 138.
  • 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 112, 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 in Essentially constructed and arranged in 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.
  • the anode gas inlets 144 form medium inlets 272 on the anode gas sealing bead 142.
  • the anode gas outlets 154 form medium outlets 274 on the anode gas sealing bead 142.
  • the cathode gas inlets 194 form medium inlets 272 on the cathode gas sealing bead 162.
  • the cathode gas outlets 214 form medium outlets 274 on the cathode gas sealing bead 162.
  • the coolant inlets 224 form medium inlets 272 on the coolant sealing bead 164.
  • the coolant outlets 225 form medium outlets 274 on the coolant sealing bead 164.
  • the aim of the bipolar plate 100 shown in FIGS. 1 to 4 and described above is to reduce the pressure drop in the media to be supplied to the electrochemical device 106 as it passes through the respectively assigned sealing beads 140.
  • the entire flow-through cross section of the respective medium inlets 272 at the relevant sealing bead 140 is at least 10%, in particular at least 15%, particularly preferably at least 20%, larger than the entire flow-through cross section of the medium outlets 274 at the same sealing bead 140.
  • the flow-through cross section of a medium inlet 272 on a sealing bead 140 is essentially the same size as the flow-through cross section of a medium outlet 274 on the same sealing bead 140, but the number of Medium inlets 272 on the sealing bead 140 is larger than the number of medium outlets 274.
  • the number of medium inlets 272 is two or more larger than the number of medium outlets 274.
  • anode gas inlets 144 on which the anode gas intake 134 faces are arranged on the anode gas in the anode gas.
  • six anode gas outlets 154 are arranged.
  • cathode gas inlets 194 are arranged on the inside of the cathode gas sealing bead 162 facing the cathode gas passage opening 136, while eight are arranged on the outside of the cathode gas sealing bead 162 facing away from the cathode gas passage opening 136
  • Cathode gas outlets 214 are arranged.
  • coolant inlets 224 are arranged on the inside of the coolant sealing bead 164 facing the coolant passage opening 138, while seven coolant outlets 225 are arranged on the outside of the coolant sealing bead 164 facing away from the coolant passage opening 138 . This significantly reduces the pressure drop in the coolant when the coolant flows from the coolant passage opening 138 through the coolant sealing bead 164 into the coolant distribution area 242.
  • the anode gas distribution area 170 forms a medium distribution area 276 for the anode gas.
  • the cathode gas distribution area 216 forms a medium distribution area 276 for the cathode gas.
  • the coolant distribution area 242 forms a medium distribution area 276 for the coolant.
  • Each of the medium distribution areas 276 includes a medium inlet area 278 through which the respective medium enters the respective medium distribution area 276.
  • That section of a sealing bead 140 which faces the electrochemically active region 114 of the bipolar plate 100 forms a distribution area section 280 of the respective sealing bead 140.
  • the anode gas flow field 116 forms a medium flow field 282 for the anode gas.
  • the cathode gas flow field 118 forms a medium flow field 282 for the cathode gas.
  • the coolant flow field 120 forms a medium flow field 282 for the coolant.
  • Each of the medium flow fields 282 of the bipolar plate 100 includes medium flow channels 284 which extend along a main flow direction of the medium through the relevant medium flow field 282.
  • Each of the medium outlets 274 is preferably arranged and aligned on the respective sealing bead 140 in such a way that the medium flowing through the medium outlet 274 flows out of the medium outlet 274 directed towards a medium inlet area 278 of the respectively assigned medium distribution area 276.
  • All medium outlets 274 are preferably arranged on the distribution area section 280 of the respective sealing bead 140, which lies opposite the medium inlet area 278 of the respectively assigned medium distribution area 276.
  • At least one medium inlet 272 is preferably arranged outside the distribution area section 280 of the respective sealing bead 140 on the relevant sealing bead 140.
  • At least two, in particular at least three, particularly preferably at least four, medium inlets 272 are arranged outside the distribution area section 280 of the respective sealing bead 140 on the relevant sealing bead 140.
  • a medium outlet section 286 of the respective sealing bead 140 is defined in that it begins at a first outer medium outlet 274a and ends at a second outer medium outlet 274b.
  • each sealing bead 140 It is preferably provided for each sealing bead 140 that at least one medium inlet 272 is arranged outside the medium outlet section 286 of the respective sealing bead 140 on the relevant sealing bead 140.
  • the longitudinal direction 108 (x direction) of the bipolar plate 100 runs parallel to a main flow direction of the media through the medium flow fields 282 assigned to the media.
  • each sealing bead 140 at least one medium inlet 272 is arranged and aligned on the respective sealing bead 140 in such a way that the medium is essentially perpendicular to the longitudinal direction 108, i.e. essentially parallel to the transverse direction 110, of the bipolar plate 100 through the relevant medium inlet 272 into the Interior of the respective sealing bead 140 flows in.
  • no medium inlet 272 is arranged on a curved section of the edge of the respective medium passage opening 130.
  • the flow-through cross section of the respective sealing bead 140 is preferably larger than the average flow-through cross section of a medium flow channel 284 of the medium flow field 282 of the bipolar plate 100 assigned to the respective medium.

Landscapes

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

Abstract

L'invention concerne une plaque bipolaire pour une unité électrochimique d'un appareil électrochimique, qui comprend une pluralité d'unités électrochimiques qui se suivent le long d'une direction d'empilement, la plaque bipolaire comprenant les éléments suivants : - Au moins une ouverture de passage de milieu, qui forme une partie d'un canal de milieu qui s'étend le long de la direction d'empilement à travers l'appareil électrochimique ; - un cordon d'étanchéité, qui s'étend autour de l'ouverture de passage de milieu ; - une pluralité d'entrées de milieu, qui sont disposées sur un côté interne du cordon d'étanchéité faisant face à l'ouverture de passage de milieu et permettent à un milieu de s'écouler à l'intérieur du cordon d'étanchéité ; et - une pluralité de sorties de milieu, qui sont disposées sur un côté extérieur du cordon d'étanchéité opposé à l'ouverture de passage de milieu et permettent à un milieu de s'écouler hors de l'intérieur du cordon d'étanchéité, la perte de pression qui se produit lorsque le milieu s'écoule à partir de l'ouverture de passage de milieu à travers les entrées de milieu, l'intérieur du cordon d'étanchéité et les sorties de milieu, est aussi faible que possible et, de préférence, le milieu s'écoule hors des sorties de milieu aussi uniformément que possible par l'intermédiaire d'une région d'entrée de milieu d'une région de distribution de milieu, à laquelle il est proposé que la section transversale d'écoulement total des entrées de milieu soit d'au moins 10 % plus grande que la section transversale d'écoulement total des sorties de milieu.
EP23748441.5A 2022-08-01 2023-07-17 Plaque bipolaire pour unité électrochimique d'appareil électrochimique, et appareil électrochimique Pending EP4566104A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022119219.9A DE102022119219A1 (de) 2022-08-01 2022-08-01 Bipolarplatte für eine elektrochemische Einheit einer elektrochemischen Vorrichtung und elektrochemische Vorrichtung
PCT/EP2023/069814 WO2024028093A1 (fr) 2022-08-01 2023-07-17 Plaque bipolaire pour unité électrochimique d'appareil électrochimique, et appareil électrochimique

Publications (1)

Publication Number Publication Date
EP4566104A1 true EP4566104A1 (fr) 2025-06-11

Family

ID=87520059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23748441.5A Pending EP4566104A1 (fr) 2022-08-01 2023-07-17 Plaque bipolaire pour unité électrochimique d'appareil électrochimique, et appareil électrochimique

Country Status (5)

Country Link
US (1) US20250174680A1 (fr)
EP (1) EP4566104A1 (fr)
CN (1) CN119547230A (fr)
DE (1) DE102022119219A1 (fr)
WO (1) WO2024028093A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6618513B2 (ja) 2017-07-21 2019-12-11 本田技研工業株式会社 発電セル
FR3079676B1 (fr) * 2018-03-27 2022-01-07 Symbiofcell Plaque bipolaire a canaux ondules
JP7038692B2 (ja) 2019-11-25 2022-03-18 本田技研工業株式会社 燃料電池用セパレータ及び発電セル
JP2021125329A (ja) * 2020-02-04 2021-08-30 本田技研工業株式会社 燃料電池用部材の製造方法
JP7469085B2 (ja) 2020-03-12 2024-04-16 本田技研工業株式会社 燃料電池用金属セパレータ及び発電セル
DE202020103228U1 (de) * 2020-06-04 2021-09-07 Reinz-Dichtungs-Gmbh Bipolarplatte mit verbesserter Temperaturverteilung
DE102021103436A1 (de) * 2021-02-15 2022-08-18 Audi Aktiengesellschaft Bipolarplatte mit geneigt angeordneten Einströmkanalabschnitten für einen Brennstoffzellenstapel, Brennstoffzellensystem und Kraftfahrzeug

Also Published As

Publication number Publication date
CN119547230A (zh) 2025-02-28
WO2024028093A1 (fr) 2024-02-08
US20250174680A1 (en) 2025-05-29
DE102022119219A1 (de) 2024-02-01

Similar Documents

Publication Publication Date Title
DE102005057045B4 (de) Bipolarplatte und deren Verwendung in einer Brennstoffzelleneinheit
DE112006003413T5 (de) Separator für Brennstoffzellen
WO2024028094A2 (fr) Plaque bipolaire destinée à une unité électrochimique d'un dispositif électrochimique et dispositif électrochimique
DE202018103058U1 (de) Separatorplatte für ein elektrochemisches System
DE102022119209A1 (de) Bipolarplatte für eine elektrochemische Einheit einer elektrochemischen Vorrichtung und elektrochemische Vorrichtung
WO2017016976A1 (fr) Plaque bipolaire et unité électrodes-membrane pour une cellule de combustible disposée dans un empilement de cellules de combustible, cellule de combustible et empilement de cellules de combustible
DE102022106498A1 (de) Elektrolyseur für die Wasserelektrolyse und Verfahren zur Wasserelektrolyse
WO2024028095A2 (fr) 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
EP2156495B1 (fr) Unité récurrente pour empilement de piles à combustible
WO2022084135A1 (fr) Plaque bipolaire pour une pile à combustible, pile à combustible, et véhicule ayant un empilement de pile à combustible
DE102022122717B3 (de) Bipolarplatte und elektrochemische Zelle
EP3756231B1 (fr) Structure de distribution de fluide pour dispositif électrochimique
WO2024028093A1 (fr) Plaque bipolaire pour unité électrochimique d'appareil électrochimique, et appareil électrochimique
DE102005057044B4 (de) Bipolarplatte und deren Verwendung
DE102016205010A1 (de) Bipolarplatte, Brennstoffzelle und ein Kraftfahrzeug
WO2024188698A1 (fr) Plaque de champ d'écoulement et dispositif électrochimique comprenant une plaque de champ d'écoulement
EP4128401B1 (fr) Plaque bipolaire pour un dispositif électrochimique
DE102006039794A1 (de) Polymer-Feststoffbrennstoffzelle
DE102024114370A1 (de) Bipolarplatte und Brennstoffzellenvorrichtung mit einer Bipolarplatte
DE102022113249A1 (de) Elektrochemische Vorrichtung
DE102024127952A1 (de) Plattenanordnung für einen Stapel elektrochemischer Zellen und Verfahren zur Herstellung einer Plattenanordnung
DE102023129011A1 (de) Elektrochemische Vorrichtung
WO2019011869A1 (fr) Système d'étanchéité conçu pour un dispositif électrochimique
EP4293761A1 (fr) Guidage de l'écoulement de fluide pour le guidage d'un fluide en écoulement et utilisations du guidage de l'écoulement de fluide
WO2026041340A1 (fr) Unité de cadre d'écoulement pour une cellule électrochimique d'une batterie à flux redox, et empilement de cellules

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20250128

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR

P01 Opt-out of the competence of the unified patent court (upc) registered

Free format text: CASE NUMBER: APP_28713/2025

Effective date: 20250616

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)