WO2024256538A1 - Plaque séparatrice pour système électrochimique - Google Patents

Plaque séparatrice pour système électrochimique Download PDF

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Publication number
WO2024256538A1
WO2024256538A1 PCT/EP2024/066360 EP2024066360W WO2024256538A1 WO 2024256538 A1 WO2024256538 A1 WO 2024256538A1 EP 2024066360 W EP2024066360 W EP 2024066360W WO 2024256538 A1 WO2024256538 A1 WO 2024256538A1
Authority
WO
WIPO (PCT)
Prior art keywords
webs
plate
region
individual
fluid
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.)
Ceased
Application number
PCT/EP2024/066360
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German (de)
English (en)
Inventor
Bernadette GRÜNWALD
Thomas Glück
Arnold Gente
Stefan Schoenbauer
Stefan Schuerg
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.)
Robert Bosch GmbH
Reinz Dichtungs GmbH
Original Assignee
Robert Bosch GmbH
Reinz Dichtungs 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 Robert Bosch GmbH, Reinz Dichtungs GmbH filed Critical Robert Bosch GmbH
Publication of WO2024256538A1 publication Critical patent/WO2024256538A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—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
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0223—Composites
    • H01M8/0228—Composites in the form of layered or coated products
    • 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
    • H01M8/02—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
    • H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
    • 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
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • 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
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • 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 invention relates to a separator plate for an electrochemical system.
  • the electrochemical system can in particular be a fuel cell system, an electrochemical compressor, an electrolyzer or a redox flow battery.
  • An electrochemical system with a plurality of such separator plates is also disclosed.
  • Known electrochemical systems of the type mentioned normally comprise a stack of electrochemical cells, each of which is separated from one another by separator plates.
  • the separator plates are also referred to as bipolar plates.
  • the separator plates can serve, for example, to electrically contact the electrodes of the individual electrochemical cells (e.g. fuel cells) and/or to electrically connect adjacent cells (series connection of the cells).
  • the separator plates are typically formed from two individual plates, in particular joined together.
  • the individual plates can be joined together in a materially bonded manner, e.g. by one or more welded joints, in particular by one or more laser welded joints.
  • the separator plates or the individual plates can each have or form structures which are designed, for example, to supply the electrochemical cells arranged between adjacent separator plates with one or more media and/or to transport away reaction products.
  • these structures can be used to guide a cooling fluid through a gap between the individual plates of a separator plate.
  • the structures can, for example, comprise sequences of webs and channels.
  • the media can therefore be fuels (e.g. hydrogen or methanol), reaction gases (e.g. air or oxygen) or coolants.
  • the terms medium and fluid can be used synonymously.
  • the separator plates usually each have at least one through-opening through which the media can be fed to the electrochemical cells or membrane electrode assemblies (MEAs).
  • MEAs membrane electrode assemblies
  • a respective fluid is guided by means of the structures described above into a respective first distribution area and from there into a flow field opposite the active area of the cell or MEA. After flowing through the active area, the fluid is fed back to an outlet through-opening via a second distribution area, also called a collection area.
  • a second distribution area also called a collection area.
  • a first fluid e.g. a fuel
  • a second fluid e.g. a reaction gas
  • a cooling fluid is usually guided in an interior space delimited by the inner sides of the individual plates.
  • the media are usually guided through the system by means of external pumping.
  • An object of the present invention is therefore to limit pressure losses in the fluid flow of a separator plate and thus to improve a total performance of an electrochemical system with a plurality of such separator plates.
  • a separator plate for an electrochemical system, comprising a first individual plate and a second individual plate, the first individual plate, which is in particular an anode plate, comprising:
  • the distribution region comprising:
  • first portion defining a fluid connection between the through-opening and the connection region and having a plurality of first webs and first channels formed between the first webs
  • connection region which defines a fluid connection between the connection region and the flow field and which has a plurality of second webs and second channels formed between the second webs
  • connection region is arranged between the first and second sections of the distribution region such that each fluid exchange between the first and second sections flows through the connection region
  • a width of the connection region runs parallel to the main flow axis and the width is at least 1 mm and a maximum of 5 mm.
  • the width is between at least 2 mm and a maximum of 3 mm.
  • none or a maximum of 7%, preferably a maximum of 5%, of the first webs and the second webs merge into one another through the connection region.
  • the connection region can therefore be completely or at least substantially web-free or, in other words, at least have reduced webs compared to the first and second sections.
  • channel/web structures in the distribution areas and in the flow field usually differ from one another in terms of the number of webs and channels.
  • the webs in the distribution area usually run at a different angle to the main flow axis than in the flow field, which results in a smaller number of channels in the distribution area, even if the channel and web width corresponds to that of the flow field.
  • a coarser structure is often chosen in the distribution area than in the flow field, for example in the form of larger channel and web widths, since no material turnover and thus no power generation takes place in the distribution area.
  • Such a web layout has the disadvantage that the web/channel width in the distribution area must be an integer multiple of the web/channel width in the flow field. This also results in the restriction that the number of webs in the flow field must be an integer multiple of the number of webs in the distribution area. This is one of the structural restrictions that has so far made it difficult to design the transition area between the distribution area and the flow field in a way that optimizes pressure loss.
  • the invention provides for the connection of webs of the flow field with webs in the transition region of the first individual plate of the distribution area completely or at least for the most part, in particular any or at least most of the connections that can be made in principle between all of these webs.
  • the invention preferably all or at least almost all of the webs of the flow field end at the transition to the distribution area.
  • pressure equalization can take place between adjacent channels, which improves the even distribution of the volume flow across all channels of the flow field.
  • both the number of webs and the channel/web width in the distribution area and flow field can be designed more independently of each other than was previously the case.
  • the number of webs in the flow field does not necessarily have to be an integer multiple of the number of webs in the distribution area. This means that the structure of the distribution area can be optimized more freely than before, e.g. with regard to fluid flow, uniform distribution and pressure losses.
  • the first and the second individual plates can have inner sides facing each other, which have or define a cooling fluid distribution structure.
  • the webs and channels on an outer side of the respective individual plates can form complementarily shaped webs and channels on their respective inner side. These complementarily shaped webs and channels can be included in the cooling fluid distribution structure and/or guide the cooling fluid.
  • the cooling fluid distribution structure can also have at least one distribution area and one flow field, which can each overlap with the distribution area and flow field of the first and/or second individual plate.
  • the first and second individual plates can each have a distribution area and a flow field for fluid guidance on their outer sides, with these distribution areas and flow fields preferably overlapping in sections.
  • the second individual plate can form a cathode plate and/or can carry oxygen or air as a first fluid on its outer side.
  • the first individual plate can form an anode plate and/or can carry hydrogen or another fuel gas as a second fluid on its outer side.
  • a length of the completely or substantially web-free connection region which is measured along a longitudinal axis extending perpendicular to the main flow axis, is substantially as large as a length of the flow field measured along this longitudinal axis. This causes any fluid that is exchanged between the first and second sections of the distribution region to always flow through the connection region.
  • the width of the connection area i.e. the area through which the webs do not extend, is advantageously understood as a width in which the webs do not rest on the MEA or its reinforcing edge or the GDL at all. It therefore begins with the lowering of the first web and ends when the second web reaches its full height in the area of the web crest or vice versa.
  • the width is preferably determined parallel to the aforementioned main flow axis.
  • the second webs can each have an end facing the completely or substantially web-free connecting region, and a connecting line between these ends cannot be straight.
  • the connecting line can be corrugated, for example. In particular, it can be periodically corrugated. The periodicity can result from a repeating sequence of differently shaped and/or dimensioned second webs. This sequence can, for example, be in a direction transverse to the main flow axis.
  • the width dimensions of the completely or substantially web-free connecting area can be limited (in particular due to the straight connecting line of the ends of the first webs).
  • the design freedom for the second webs can be increased.
  • the latter enables, for example, the formation of sufficiently large and suitably extending flow cross sections of the cooling fluid distribution structure on the inside of the first individual plates.
  • the connecting lines can each define a boundary of the web-free connection area.
  • at least the longest sections of the first webs run at an angle relative to the main flow axis that is greater than or equal to 70°. The smallest achievable cutting angle can be considered.
  • At least the longest sections of the second webs can run at an angle relative to the main flow axis that is less than 45° and preferably less than 20°. Again, the smallest achievable intersection angle can be considered.
  • the longest sections of the first and second webs can be straight.
  • ends of the second webs in particular can be non-straight and in particular curved and/or have enlarged or varying flow cross-sectional dimensions.
  • At least the first webs are each at least three times, in particular at least five times, in particular at least seven times as long as they are wide, thus serving to provide direction and not just to support the MEA, its reinforcing edge or the GDL, with the length and width dimensions each running parallel to a flat surface plane of the separator plate.
  • the plane surface of a respective individual plate can be defined, for example, by an edge of the individual plate or by those flat areas of the individual plate that are not formed as a result of an embossing or deep drawing process to form the web-channel structures or beads described here.
  • the plane surfaces can run in the neutral fibers of the corresponding sections of the plates, on the other hand, it is also possible to consider the surfaces of the relevant sections of the plates as plane surfaces. With the latter approach, however, it must be ensured that the material thickness of only one of the two plates considered is taken into account when considering distances or the like.
  • the first section has a greater extent than the second section, with the extensions each running parallel to the main flow axis.
  • the extension of the first section can be at least three times as large as the extension of the second section.
  • the number of second webs is not an integer multiple of the number of first webs.
  • the number of first webs can be less than half the number of second webs. This results in corresponding design freedom for the first and second sections of the distribution area.
  • the second individual plate can have channels on its inner side opposite the completely or essentially web-free connection area of the first individual plate and in particular bridging channels.
  • the cooling fluid can be guided along the inside of the connection area in these channels. In this way, the cooling fluid can be exchanged between the flow field and distribution area of the cooling fluid distribution structure, even if the completely or essentially web-free connection area does not provide any channels for the cooling fluid on its inside.
  • this can mean both the actual flow field and an overlap area that closes off the flow field in the direction of the distribution area.
  • the channels of the cooling fluid in the overlap area can be formed less high, so that there is sufficient space for the overlap of the GDL and the MEA reinforcement edge, which will be explained below.
  • a further development provides that the completely or substantially web-free connection region of the first individual plate is opposite a region of the second individual plate which has at least sections of a plurality of webs formed in the second individual plate and channels formed between the webs.
  • the invention also relates to an electrochemical system having a plurality of separator plates according to any aspect described herein.
  • Figure 1 shows a perspective view of an electrochemical system with a plurality of stacked separator plates with membrane electrode units arranged between them.
  • Figure 2 shows a perspective view of two separator plates of a system similar to Figure 1 with a membrane electrode assembly (MEA) arranged between the separator plates.
  • MEA membrane electrode assembly
  • Figure 3 shows a perspective partial view of the separator plate of the first embodiment in the region of a distribution area of a first Single plate, especially anode plate, of the separator plate.
  • Figure 4 shows an orthogonal projection of the structural features of a part of the separator plate into a common plane.
  • Figure 5 shows in two sub-figures 5A, 5B a comparable orthogonal projection as Figure 4 as well as a corresponding sectional view.
  • Figures 6 and 7 each show views analogous to Fig. 3 of separator plates according to further embodiments.
  • FIG 1 shows an electrochemical system 1 of the type proposed here with a plurality of identical metallic separator plates 2 (or bipolar plates). These are arranged in a stack 6 and stacked along a z-direction 7. The separator plates 2 of the stack 6 are clamped between two end plates 3, 4. The z-direction 7 is also called the stack direction.
  • the system 1 is a fuel cell stack. Two adjacent separator plates 2 of the stack 6 enclose an electrochemical cell between them, which serves, for example, to convert chemical energy into electrical energy.
  • a membrane electrode unit (MEA) 10 is arranged between adjacent separator plates 2 of the stack 6 (see Figure 2 below).
  • the MEAs typically each contain at least one membrane, e.g. an electrolyte membrane.
  • a gas diffusion layer (GDL) can be arranged on one or both surfaces of the MEA.
  • GDL gas diffusion layer
  • the system 1 can also be designed as an electrolyzer, compressor or redox flow battery.
  • Separator plates can also be used in these electrochemical systems.
  • the structure of these separator plates can correspond to the structure of the separator plates 2 explained in more detail here, even if the media guided on or through the separator plates in an electrolyzer, an electrochemical compressor or a redox flow battery can differ from the media used for a fuel cell system.
  • the separator plates 2 each define a plate plane, whereby the plate planes of the separator plates 2 are each aligned parallel to the xy plane and thus perpendicular to the stacking direction (z-axis 7).
  • the end plate 4 has a plurality of media connections 5 via which media can be fed into the system 1 and via which media can be removed from the system 1.
  • These media that can be fed into the system 1 and removed from the system 1 can include, for example, fuels such as molecular hydrogen or methanol, reaction gases such as air or oxygen, reaction products such as water vapor or depleted fuels or a cooling fluid such as water and/or glycol.
  • Figure 2 shows in perspective two adjacent separator plates 2 or bipolar plates, which can be included in an electrochemical system of the type of system 1 from Figure 1.
  • the separator plates 2 correspond to an example from the prior art. However, the properties and features explained below in relation to this can also apply to the separator plates 2 according to the invention disclosed here or can be provided for them, unless otherwise mentioned or apparent.
  • Fig. 2 also shows a known membrane electrode unit (MEA) 10 arranged between these adjacent separator plates 2, wherein the MEA 10 in Fig. 2 is largely covered by the separator plate 2 facing the viewer.
  • the separator plate 2 is formed from two materially joined individual plates 2a, 2b, of which in Fig. 2 only the individual plate 2a facing the viewer is visible, which covers the other individual plate 2b.
  • the individual plates 2a, 2b can each be made from a metal sheet, e.g. from a stainless steel sheet.
  • the individual plates 2a, 2b can, for example, be welded to one another, e.g. by laser welding connections or only be connected when the stack is stacked.
  • the design of fluid-conducting structures on the outside of the individual plate 2a facing the viewer can differ in Fig. 2 from the structures according to the invention in the other figures below.
  • the individual plates 2a, 2b have through holes aligned with each other, which form through holes 11a-c of the separator plate 2.
  • the through openings 11a-c form lines that extend in the stacking direction 7 through the stack 6 (see Figure 1).
  • each of the lines formed by the through openings 11a-c is in fluid communication with one of the ports 5 in the end plate 4 of the system 1.
  • a cooling fluid for example, can be introduced into the stack 6 or drained from the stack 6 via the lines formed by the through openings 11a.
  • the lines formed by the through openings 11b, 11c can be designed to supply the electrochemical cells of the fuel cell stack of the system 1 with fuel and with reaction gas and to drain the reaction products from the stack 6.
  • the distribution areas 20a each comprise structures which are designed to distribute a medium introduced from a first of the two through-openings 11b into one of the distribution areas 20a by means of the flow field 17b over the active area 18 or to distribute a medium flowing from the active area 18 or from the flow field 17a to the second of the through-openings 11b. To collect or bundle medium. In the latter case, the collecting distribution area 20a can also be referred to as a collection area.
  • the fluid-conducting structures of the distribution areas 20a in Figure 2 are also provided by webs and channels running between the webs and delimited by the webs.
  • a cooling fluid distribution structure 19 formed and/or enclosed between the individual plates 2a, 2b also has distribution areas which overlap with the distribution areas 20a, b of the individual plates 2a, 2b.
  • This cooling fluid distribution structure is fluidically connected to a flow field or comprises this, wherein this flow field overlaps with the flow fields 17a, b of the outer sides of the individual plates 2a, 2b or is enclosed between them.
  • the web-channel structures on the outer sides of the individual plates 2a, 2b form complementarily shaped web-channel structures on the corresponding inner sides and thus complementarily shaped web-channel structures of the cooling fluid distribution structure 19.
  • the two through-openings 11b or the lines formed by the through-openings 11b through the plate stack of the system 1 are each in fluid communication with one another via passages 13b in sealing beads 12b, via the distribution structures of the distribution areas 20a, b and via the flow field 17a of the individual plate 2a facing the viewer in Figure 2.
  • This individual plate 2a is a first individual plate 2a in the sense of this disclosure.
  • a fluid guided along the outside of this individual plate 2a is preferably hydrogen, so that the through-openings 11b are preferably hydrogen through-openings 11b. This results in particular from the smallest cross-section of the hydrogen through-openings 11b compared to the other through-openings 11a, 11c.
  • the through-openings 11a are each in fluid communication with one another via a cavity enclosed or surrounded by the individual plates 2a, 2b, which forms the cooling fluid distribution structure 19. This is again done, for example, by means of feedthroughs 13a.
  • This cavity or this cooling fluid distribution structure 19 serves to guide a cooling fluid through the separator plate 2, in particular to cool the electrochemically active region 18 of the MEA.
  • the through-openings 11a are therefore cooling fluid through-openings, which is particularly obvious from their average cross-sectional size in comparison to the other through-openings 11b, 11c.
  • Figure 3 shows a section of the bipolar plate 2 with a view of the outside of the first individual plate 2a, preferably an anode plate, in the dashed area in Figure 2.
  • the viewing angle is rotated compared to Figure 2, as can be seen from the indicated position of the through-opening 11b in Figure 3. Only a cut-off part of the distribution area 20a and the flow field 17a are shown.
  • a fluid is guided into the flow field 17a from the through-opening 11b via the distribution area 20a and guided by a web-channel structure 46a on the outside of the second individual plate 2a.
  • the flow field 17a has a main flow axis S, along which the fluid flows through the flow field 17a (see also main flow axis S in Fig. 2).
  • the web-channel structure 46a has several outwardly projecting webs 27a, 37a as well as channels 29a, 39a enclosed between them, selected ones of which are provided with a corresponding reference symbol.
  • the deepest areas of the channels 29a, 39a run in the plane of the second individual plate 2a.
  • the web-channel structure 46a has first webs 27a and first channels 29a in a first section 21a of the distribution area 20a, which run from the through-opening 11b to a connecting area 60.
  • the first webs 27a are, as shown, optionally interrupted in sections along their longitudinal extension within the distribution area 20a, but can also extend continuously.
  • the web-channel structure 46a also has second webs 37a and second channels 39a, which run from the connecting region 60 to the flow field 17a and continue there as webs and channels of the flow field 17a or merge into corresponding webs and channels.
  • the second webs 37a and second channels 39a extend in a second section 22a of the distribution region 20a.
  • the first and second sections 21a, 22a are connected via the connecting region 60, so that all fluid that is exchanged between the first and second sections 21a, 22a must pass through the connecting region 60.
  • the connecting region 60 is completely free of webs. It therefore extends as a gap-like free region between the first and second sections 21a, 22a. Furthermore, it preferably has a consistently constant height and/or a consistently planar shape.
  • the number of second webs 37a in the second section 22a is greater than the number of first webs 27a in the first section 21a. For example, at least five times or at least nine times as many second webs 37a as first webs 27a can be provided.
  • the flow field 17a can be characterized, for example, in that all of the webs and channels included here are straight and run parallel to one another and parallel to the main flow direction.
  • the webs and channels of the flow field 17a could also be wave-shaped and run with a similar wave shape next to one another and along the main flow direction S.
  • the wave shape can oscillate evenly around the main flow axis S and/or the main flow axis S can define a central axis of the wave shape around which it oscillates in a wave-like manner.
  • the flow field 17a can be characterized in that it lies within an MEA reinforcement edge and in particular is surrounded and/or framed by it at least in sections.
  • the MEA reinforcement edge is not opposite the flow field 17a itself, but rather the actually active area of the MEA, in particular in the form of its electrolyte membrane.
  • the situation can be different with regard to the less deeply formed area assigned to the flow field, in which the MEA reinforcement edge and the GDL overlap one another.
  • the completely web-free connecting region 60 in the example of Fig. 3 preferably runs in the plane of the first individual plate 2a.
  • the webs 27a, 37a run out onto the plane of the first individual plate 2a at the edges of the web-free connecting region 60.
  • the webs 27a, 37a do not extend along the main flow axis S through the connecting region 60 and are therefore not directly connected to one another and do not merge into one another. Instead, they end on a respective adjacent side of the connecting region 60 and are spaced apart from one another by the latter.
  • Fig. 3 shows that ends of the first webs 27a, which adjoin the connecting region 60, can be connected by means of a straight connecting line 62.
  • the connecting line 62 runs perpendicular to the main flow axis S.
  • the ends of the second webs 37a, which adjoin the connecting region 60 can be connected by means of a non-rectilinear connecting line 64.
  • this connecting line 64 is wave-shaped and, in particular, periodically wave-shaped. This results from the fact that the ends of the second webs 37a, which adjoin the connecting region 60, form a regularly repeating sequence of in a certain way shaped and define ends extending to a certain extent parallel to the main flow axis S.
  • a part of the second webs 37a has enlarged and curved end sections 33 at the transition to the web-free connection region 60.
  • the web-free connection region 60 in Fig. 3 is designed to be continuous, in particular in such a way that it has a continuous region without webs. This region can extend essentially orthogonally to the main flow axis S.
  • Figure 3 shows a longitudinal axis L3 of the web-free connection region 60, which runs orthogonally to the main flow axis S.
  • a dimension of the web-free connection region 60 along this longitudinal axis L3 is at least as large as a dimension of the flow field 17a along the longitudinal axis L3. This underlines that the fluid must always flow through the web-free connection region 60 in order to switch between the first and second sections 21a, 22a.
  • a width dimension B of the web-free connection region 60 extends orthogonally to the longitudinal axis L3 and along the main flow axis S. Due to the uneven extension of the ends of the second webs 37a, which border on the web-free connection region 60 - see the wavy connection line 64 - the width dimension B of the web-free connection region 60 varies along the longitudinal axis L3. The width B thus fluctuates between at least 1 mm and up to 5 mm.
  • both the extension E1 of the first section 21a and the extension E2 of the second section 22a are significantly larger than the width dimension B of the web-free connection region 60 in Fig. 3, for example at least twice as large or at least three times as large. Furthermore, the extension E1 of the first section 21a is at least twice and preferably at least three times as large as the extension E2 of the second section 22a.
  • Figure 3 also shows the different orientations of the first and second webs 27a, 37a based on respective angles Wl, W2. These angles Wl, W2 define orientations of the webs 27a, 37a relative to the main flow axis S.
  • a longitudinal axis LI is entered for one of the first webs 27a. This runs at an angle Wl relative to the main flow axis S, the is smaller than 90° when considering the smallest possible cutting angle.
  • a longitudinal axis L2 is also entered for one of the second webs 37a. This is angled relative to the main flow axis S by an angle W2, which is, however, significantly smaller than the angle W1 of the first webs 27a.
  • the angle W2 is shown schematically greatly enlarged and can be significantly smaller. It can also be 0°.
  • Figure 3 further shows that the first webs 27a are at least three times, in particular at least five times, in particular seven times as long as they are wide, wherein the length and width dimensions each run parallel to a flat surface plane of the first individual plate 2a.
  • Fig. 4 shows an orthogonal projection of a section of the separator plate 2 of the first embodiment, which is oriented analogously to Fig. 2, in a plane parallel to the planes of the flat surfaces of the individual plates 2a, 2b.
  • the view corresponds to a view through an area of the separator plate 2 that includes a transition between the flow field 17a and the distribution area 20a of the first individual plate 2a and thus also a part of the connection area 60, which is completely web-free in this embodiment, wherein the area in which the webs are completely lowered is shown schematically hatched from top left to bottom right.
  • Positions of the distribution areas 20a-c and flow fields 17a-c on the outer and inner sides of the first and second individual plates 2a, b are entered. These overlap at least in sections.
  • Those webs and channels from Fig. 4 that are not present in Fig. 3 are webs and channels of the second individual plate 2b.
  • the essentially or completely web-free connection area 60 in the first individual plate 2a is thus opposite an area in the second individual plate 2b through which both channels 30c on the inside of the first individual plate 2a and unspecified channels on the outside of the first individual plate 2a extend, which are formed in the area of the back of the webs between the channels 30c.
  • the essentially or completely web-free connection region 60 is therefore advantageously formed only in one of the two individual plates of the separator plate.
  • Three channels 27c of the cooling fluid distribution structure 19 are shown, each of which is formed complementarily to webs on the outside of the second individual plate 2b.
  • the channels 27c each have an optionally widened curvature region 52, which, however, could also not be widened compared to adjacent segments of the first channels 27c.
  • each channel 27c is connected in a fluid-conducting manner to three channels 30c on the inside of the first individual plate 2a. These channels 30c are shaped complementarily to second webs 37a on the outside of the first individual plate 2a. Not all of the second channels 30c are marked with a corresponding reference symbol in Figure 4.
  • the curved regions 52 of the second individual plate 2b partially overlap with the web-free connection region 60 and extend through it or, in other words, bridge it. This allows cooling fluid to flow through the cooling fluid distribution structure 19, although there are no webs on the outside of the first individual plate 2a in the web-free connection region 60 that could form complementarily shaped channels of the cooling fluid distribution structure 19.
  • the web-free connection region 60 is opposite channels formed on the inside of the second individual plate 2b, which provide a fluid connection between a distribution region 20c and the flow field 17c of the cooling fluid distribution structure 19.
  • Figure 5A shows essentially the same section as Figure 4, but here we will now look more closely at the determination of the width B of the connection area 60
  • the area that is shown hatched in Figure 5A from bottom left to top right represents the area in which there is no contact between the webs and the MEA reinforcement edge or the GDL on the corresponding outer side, i.e. the actual connection area 60.
  • the areas 270 of the first webs 27a closest to the second webs 37a, which have the maximum height of the webs 27a are considered and on the other hand the areas 370 of the second webs 37a closest to the first webs 27a, which also have the maximum height, whereby the height can vary, as is clear from Figure 5B.
  • these are therefore, on the side of the distribution area 20a, the web crest lines 280 of the first webs 27a closest to the second webs 37a up to the respective start of their lowering.
  • the connection between corresponding line sections on web crest lines 280 is parallel to the main flow axis S.
  • the areas of maximum height of the webs 37a facing the distribution area 20a are the end points of the web crest lines 380 at the points 375 at which the lowering of the web crests begins to form the connecting area 60.
  • the width B can be determined, for example, along one of the double arrows from Figure 5A, see also Figure 5B.
  • Figures 6 and 7 each show views of separator plates 2 according to further embodiments that are analogous to Figure 3.
  • the only difference to the embodiment of Figure 3 is that the connecting region 60 is not completely web-free in this case.
  • All explanations for Figure 3 also apply to the identical features and structures of the embodiments of Figures 6 and 7.
  • the connecting region 60 is not completely free of webs.
  • the majority of the first and second webs 27a, 37a do not merge into another of the first and second webs 27a, 37a and the connecting region 60 is web-free in a large part of its surface.
  • first and second webs 27a, 37a that merge into one another are only examples in Figures 6 and 7 and may differ from the variants shown.

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

Abstract

L'invention concerne une plaque séparatrice pour système électrochimique. Le système électrochimique peut en particulier être un système de pile à combustible, un compresseur électrochimique, un électrolyseur ou une batterie à flux redox. L'invention concerne également un système électrochimique comprenant de multiples plaques séparatrices de ce type.
PCT/EP2024/066360 2023-06-13 2024-06-13 Plaque séparatrice pour système électrochimique Ceased WO2024256538A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202023103245.1U DE202023103245U1 (de) 2023-06-13 2023-06-13 Separatorplatte für ein elektrochemisches System
DE202023103245.1 2023-06-13

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WO2024256538A1 true WO2024256538A1 (fr) 2024-12-19

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102034986A (zh) * 2010-11-25 2011-04-27 新源动力股份有限公司 一种质子交换膜燃料电池双极板分配头
JP5082313B2 (ja) * 2006-07-12 2012-11-28 日産自動車株式会社 燃料電池のセパレータ構造
US8889318B2 (en) * 2010-05-11 2014-11-18 Ford Global Technologies, Llc Fuel cell stack that promotes generally uniform flow therein
DE202016107302U1 (de) 2016-12-22 2018-03-27 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
CN113571729A (zh) * 2020-04-29 2021-10-29 未势能源科技有限公司 燃料电池用双极板和电堆结构
CN215418241U (zh) * 2021-08-10 2022-01-04 阜新德尔汽车部件股份有限公司 燃料电池双极板以及燃料电池
DE202020106459U1 (de) 2020-11-11 2022-02-16 Reinz-Dichtungs-Gmbh Anordnung für ein elektrochemisches System, Stapel sowie elektrochemisches System
WO2022268256A1 (fr) * 2021-06-22 2022-12-29 Schaeffler Technologies AG & Co. KG Plaque bipolaire et procédé de fonctionnement de plaque bipolaire

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018103058U1 (de) * 2018-05-30 2019-09-02 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
DE102022112931A1 (de) * 2021-06-01 2022-12-01 Schaeffler Technologies AG & Co. KG Bipolarplatte und Verfahren zum Betrieb eines Brennstoffzellensystems
DE102021214297B4 (de) * 2021-12-14 2023-08-17 Vitesco Technologies GmbH Bipolarplatte für einen Brennstoffzellenstapel
CN220358125U (zh) * 2023-06-14 2024-01-16 安徽瑞氢动力科技有限公司 燃料电池阴极板气体分配结构

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5082313B2 (ja) * 2006-07-12 2012-11-28 日産自動車株式会社 燃料電池のセパレータ構造
US8889318B2 (en) * 2010-05-11 2014-11-18 Ford Global Technologies, Llc Fuel cell stack that promotes generally uniform flow therein
CN102034986A (zh) * 2010-11-25 2011-04-27 新源动力股份有限公司 一种质子交换膜燃料电池双极板分配头
DE202016107302U1 (de) 2016-12-22 2018-03-27 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
CN113571729A (zh) * 2020-04-29 2021-10-29 未势能源科技有限公司 燃料电池用双极板和电堆结构
DE202020106459U1 (de) 2020-11-11 2022-02-16 Reinz-Dichtungs-Gmbh Anordnung für ein elektrochemisches System, Stapel sowie elektrochemisches System
WO2022268256A1 (fr) * 2021-06-22 2022-12-29 Schaeffler Technologies AG & Co. KG Plaque bipolaire et procédé de fonctionnement de plaque bipolaire
CN215418241U (zh) * 2021-08-10 2022-01-04 阜新德尔汽车部件股份有限公司 燃料电池双极板以及燃料电池

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