WO2024256509A1 - Plaque séparatrice pour système électrochimique - Google Patents

Plaque séparatrice pour système électrochimique Download PDF

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Publication number
WO2024256509A1
WO2024256509A1 PCT/EP2024/066306 EP2024066306W WO2024256509A1 WO 2024256509 A1 WO2024256509 A1 WO 2024256509A1 EP 2024066306 W EP2024066306 W EP 2024066306W WO 2024256509 A1 WO2024256509 A1 WO 2024256509A1
Authority
WO
WIPO (PCT)
Prior art keywords
distribution
flow field
flow
region
area
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/EP2024/066306
Other languages
German (de)
English (en)
Inventor
Bernadette GRÜNWALD
Rainer 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
Priority to DE112024002532.3T priority Critical patent/DE112024002532A5/de
Priority to CN202480039984.6A priority patent/CN121399741A/zh
Publication of WO2024256509A1 publication Critical patent/WO2024256509A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H01M8/026—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
    • H01M8/0265—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
    • 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric electrolytes
    • 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 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.
  • a separator plate for an electrochemical system comprising:
  • the first individual plate has a first flow field on its outside and at least one first distribution region which connects the first flow field and the first through-opening in a fluid-conducting manner
  • the second individual plate has a second flow field on its outside and at least one second distribution region which connects the second flow field and the second through-opening in a fluid-conducting manner
  • the first and second distribution regions each have a plurality of fluid-conducting channels
  • the first and second flow fields each have a flow field main flow axis along which the respective fluid can flow through them, and a length dimension of the first and second distribution regions extends parallel to the respective flow field main flow axis, ie to the flow field main flow axis of the flow field to which a distribution region under consideration is connected in a fluid-conducting manner
  • the first and second distribution regions each have a
  • the surface area of the first distribution area on the outside of the first individual plate can be significantly reduced without significantly impairing the function of the separator plate.
  • the surface area of the first flow field can be increased, which improves the performance of an electrochemical system comprising the separator plate.
  • the second distribution area can also be reduced accordingly, whereas the proportion of the second flow field can be increased.
  • the aim was to reduce the length of the distribution field for a fixed flow field without substantially changing the width of the distribution field. Instead, an average channel length was reduced. As a result, the required proportions were maintained.
  • any distribution region disclosed here can be spatially positioned between the through-opening, in particular a center of gravity thereof, and the flow field which the distribution region connects to one another in a fluid-conducting manner. This intermediate positioning can in particular be present along the flow field main flow axis of the flow field connected to the distribution region in a fluid-conducting manner.
  • the separator plate also has a through-opening for coolant, whereby the through-opening for coolant is preferably arranged between the through-opening for oxygen and the through-opening for hydrogen in a direction perpendicular to the flow field main flow axis.
  • the end of the distribution area facing away from the flow field can be defined by the furthest point of a distribution area, from which the medium guided on the outer surface of the individual plate is guided between the coolant through-opening and the distribution area in the direction of the flow field past the coolant through-opening.
  • the width of a distribution area can be defined so that it corresponds to the width of the associated flow field.
  • the latter can be determined as the distance between the points that are most deflected from the plane of the plane, i.e. the channel base, of the outermost channel of the flow field. If one or both of these outermost channels not only have a line of maximum deflection from the plane of the plane, but also a bottom surface of maximum deflection from the plane of the plane, the center line of this bottom surface, i.e. the center orthogonal to the flow field main flow axis, is considered. If the flow field is formed by periodically deflected, for example wave-shaped, channels and webs, the width of the flow field and thus also the width of the distribution area can result from the width of the center lines of the lowest points of the outermost channels or the corresponding bottom surfaces.
  • the average width on the last 10% of the length of the flow field adjacent to the distribution area in question can be considered as the width of the flow field.
  • the end of the flow field towards the distribution area can be defined at the point at which, on an outer side of the flow field, which forms an outer side or an outer edge of the flow field when viewed transversely to the flow field main flow axis, for example, the center line of the outermost channel experiences a first change in direction relative to the flow field main flow axis, which is at least 0.5% of the width of the flow field.
  • This can mean that the center line changes its direction relative to the flow field main flow axis, so that a distance of the center line to this flow field main flow axis changes by at least 0.5% of the width of the flow field.
  • the location at which this change in distance first occurs can define the end of the flow field towards the distribution area.
  • the location that is closer to the outer edge of the single plate that is at least substantially orthogonal to the flow field main flow axis and that lies beyond the nearest through openings can be considered.
  • the separator plate can have regions with differing heights, e.g. a region that is lowered relative to another region. For example, average, minimum or maximum heights of the respective regions can be considered.
  • regions with differing heights can each extend over a large part of the width of the separator plate, in particular over the region in which fluid-carrying channels are formed, whereby this width can run transversely to any of the flow field main axes.
  • the differences in thickness are not formed in the regions in which the sealing elements are formed.
  • these areas can be distributed along any of the flow field main axes and/or follow one another.
  • the distribution area and the flow field can be arranged in areas that differ from one another, with a height, in particular a mean or maximum height, of these areas differing from one another. Locations of maximum height can, for example, comprise web crests, with a respective web running between adjacent channels and separating them from one another.
  • a further area of different height can be arranged, which has a lower height than both the other flow field and the other distribution area.
  • This transition area can be allocated proportionately to both with regard to the aforementioned demarcation between flow field and distribution area, or belong to only one of the two; the aforementioned width definition should be the only decisive factor for this.
  • the height and the thickness can be measured orthogonally to a plane of the separator plate and in particular to a plane of any of its individual plates.
  • the plane 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 deformed as a result of an embossing or deep-drawing process to form the web-channel structures or beads described here.
  • the planes of the planes of the corresponding sections of the plates 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 planes of the planes of the planes of the plates.
  • a first area can be lowered relative to the plane of the flat surface, whereas a further area can be lowered more or less significantly relative to the plane of the flat surface.
  • the further area can lie in the plane of the flat surface or be raised relative to it. Raising relative to the plane of the flat surface can be equivalent to removing opposing areas of the individual plates, whereas lowering can reduce the distance between these opposing areas.
  • the separator plate comprises a height-reduced and/or lowered first region, which is preferably designed to be covered by a gas diffusion layer (GDL).
  • the first region can be height-reduced or lowered, for example, compared to a flat surface plane and/or compared to a second region explained below.
  • the first region can comprise the flow fields of the separator plate.
  • a GDL can be arranged on one or both surfaces of an MEA, which is supported by the separator plate and is arranged in particular between two adjacent separator plates of a stack.
  • the first region can be used as an active region by covering it with the GDL and the MEA.
  • the separator plate comprises at least one second region which is raised and/or not reduced in height. This can apply, for example, in comparison to a flat surface plane and/or the first region explained above. When comparing the heights of the first and second regions, locations of maximum height of these regions can be compared with one another, in particular web crests of these regions. Any distribution region disclosed here can be comprised of a raised second region.
  • the separator plate has a first region, which in particular comprises the flow fields, and which has a lower, in particular maximum, height compared to at least one second region, wherein the second region comprises at least one first and at least one second distribution region of the type explained above.
  • first and second regions can therefore be defined in such a way that they comprise parts of the outer sides of both individual plates, i.e. complete sections and in particular complete cross sections of the assembled separator plate.
  • the aforementioned transition region can in this sense represent a third region in terms of height, but in terms of width it can either be completely the first region, completely the second area or partly to the first and partly to the second area, according to the width of the outermost channels on both sides.
  • Any flow field disclosed here can be characterized, for example, in that all webs and channels included thereby are straight over at least a large part of their length and run parallel to one another and parallel to a flow field main flow direction of this flow field.
  • the webs and channels of a respective flow field can also be wave-shaped and run next to each other and along the main flow axis with a similar wave shape.
  • the flow field main flow axis can correspond to a longitudinal axis and/or an axis of symmetry, in particular a mirror symmetry axis, of a respective flow field or run parallel thereto.
  • the separator plate can have two outer edges or also longitudinal sides that lie opposite one another and run at least in sections along at least one of the flow field main flow axes.
  • the flow field main flow axes of the first and second flow fields can run parallel to one another or coincide with one another, in particular in an orthogonal projection into a common plane.
  • the channel lengths, as well as the total and average channel length in a distribution area are short.
  • the average channel length can be determined by adding up all the individual channel lengths of a distribution area on the outside of a single plate and then dividing by the number of these channels.
  • a maximum length of the second distribution area is less than 65%, preferably less than 55%, in particular less than 50%, of the maximum length of the first distribution area.
  • a corresponding reduction in the size of the second distribution area creates additional degrees of freedom in order to provide flow spaces for the cooling fluid, in particular by means of the second individual plates. In particular, this makes it possible to reduce flow resistances of the cooling fluid in the first distribution area.
  • a reduced length of the second distribution area compared to the first distribution area is also acceptable because the second distribution area carries hydrogen, for which this reduction in size results in only partially relevant flow resistances.
  • the maximum length of the second distribution area is greater than 35%, in particular greater than 40%, of the maximum length of the first distribution area.
  • a further development provides that the first and second flow fields are lowered relative to the respective first and second distribution areas connected thereto.
  • the connection relates to the fluid-conducting connection of the distribution area and the flow field.
  • the lowering can apply in relation to locations of maximum height encompassed by the distribution areas and flow fields. These can be, for example, web crests and preferably not channel bottoms.
  • This further development can be implemented in particular by and/or can in particular include the flow fields being encompassed by a first area of the type discussed above and the distribution areas being encompassed by a second area of the type discussed above, wherein the first area is lowered relative to the second area.
  • the maximum length of the first and second distribution region lies between a transition from the respective distribution region and (or to) an associated flow field and a point of the respective distribution region that is at a maximum distance from this transition.
  • a maximum dimension of the first and second distribution region can be orthogonal to one of the flow field main flow axes in each case in an edge region of the first and second distribution region, in which fluid from the correspondingly connected one of the first and second flow fields is fed into the distribution regions or in which fluid from the distribution regions is fed into the correspondingly connected one of the first and second flow fields.
  • the maximum dimension can run orthogonal to the flow field main flow axis of the flow field that is fluidly connected to the distribution region in question.
  • the invention also relates to an electrochemical system comprising a plurality of separator plates according to any aspect disclosed 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 is an illustration of a portion of a separator plate according to an example of the prior art.

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  • 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 séparatrice pour système électrochimique. Le système électrochimique peut consister notamment en un système de pile à combustible, un compresseur électrochimique, un électrolyseur ou une batterie redox. L'invention divulgue également un système électrochimique comprenant de multiples plaques séparatrices de ce type.
PCT/EP2024/066306 2023-06-13 2024-06-13 Plaque séparatrice pour système électrochimique Ceased WO2024256509A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112024002532.3T DE112024002532A5 (de) 2023-06-13 2024-06-13 Separatorplatte für ein elektrochemisches System
CN202480039984.6A CN121399741A (zh) 2023-06-13 2024-06-13 用于电化学系统的分隔板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202023103257.5U DE202023103257U1 (de) 2023-06-13 2023-06-13 Separatorplatte für ein elektrochemisches System
DE202023103257.5 2023-06-13

Publications (1)

Publication Number Publication Date
WO2024256509A1 true WO2024256509A1 (fr) 2024-12-19

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ID=91581189

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PCT/EP2024/066306 Ceased WO2024256509A1 (fr) 2023-06-13 2024-06-13 Plaque séparatrice pour système électrochimique

Country Status (3)

Country Link
CN (1) CN121399741A (fr)
DE (2) DE202023103257U1 (fr)
WO (1) WO2024256509A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7318973B2 (en) * 2004-08-12 2008-01-15 General Motors Corporation Stamped bridges and plates for reactant delivery for a fuel cell
DE202015104300U1 (de) * 2015-08-14 2016-08-19 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
DE202016107302U1 (de) 2016-12-22 2018-03-27 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
CN114883592A (zh) * 2022-04-18 2022-08-09 武汉众宇动力系统科技有限公司 燃料电池的极板组件及阴极板和阳极板
CN115528263A (zh) * 2022-10-18 2022-12-27 中国科学院青岛生物能源与过程研究所 一种用于大功率电解槽的矩形极板

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022106498A1 (de) * 2021-04-08 2022-10-13 Schaeffler Technologies AG & Co. KG Elektrolyseur für die Wasserelektrolyse und Verfahren zur Wasserelektrolyse
DE102022205102A1 (de) * 2022-05-23 2023-11-23 Siemens Energy Global GmbH & Co. KG Verteilerstruktur für elektrochemische Zellen, Elektrolyseur und Power-to-X-Anlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7318973B2 (en) * 2004-08-12 2008-01-15 General Motors Corporation Stamped bridges and plates for reactant delivery for a fuel cell
DE202015104300U1 (de) * 2015-08-14 2016-08-19 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
DE202016107302U1 (de) 2016-12-22 2018-03-27 Reinz-Dichtungs-Gmbh Separatorplatte für ein elektrochemisches System
CN114883592A (zh) * 2022-04-18 2022-08-09 武汉众宇动力系统科技有限公司 燃料电池的极板组件及阴极板和阳极板
CN115528263A (zh) * 2022-10-18 2022-12-27 中国科学院青岛生物能源与过程研究所 一种用于大功率电解槽的矩形极板

Also Published As

Publication number Publication date
CN121399741A (zh) 2026-01-23
DE112024002532A5 (de) 2026-05-07
DE202023103257U1 (de) 2024-09-17

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