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WO2010054744A1 - Plaque bipolaire pour un agencement de piles à combustible, en particulier destinée à être placée entre deux agencements d'électrodes à membrane dans un empilement de piles à combustible - Google Patents

Plaque bipolaire pour un agencement de piles à combustible, en particulier destinée à être placée entre deux agencements d'électrodes à membrane dans un empilement de piles à combustible Download PDF

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Publication number
WO2010054744A1
WO2010054744A1 PCT/EP2009/007591 EP2009007591W WO2010054744A1 WO 2010054744 A1 WO2010054744 A1 WO 2010054744A1 EP 2009007591 W EP2009007591 W EP 2009007591W WO 2010054744 A1 WO2010054744 A1 WO 2010054744A1
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WO
WIPO (PCT)
Prior art keywords
flow field
bipolar plate
channels
plate
inflow
Prior art date
Application number
PCT/EP2009/007591
Other languages
German (de)
English (en)
Inventor
Felix Blank
Markus Schudy
Jörg KLEEMANN
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2010054744A1 publication Critical patent/WO2010054744A1/fr

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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
    • H01M8/0204—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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—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
    • H01M8/0263—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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
    • H01M8/04074—Heat exchange unit structures specially adapted for fuel cell
    • 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
    • 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
    • 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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04029—Heat exchange using liquids
    • 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 a fuel cell assembly in particular for the arrangement between two adjacent membrane-electrode assemblies in a fuel cell stack
  • the invention relates to a bipolar plate for a fuel cell assembly, in particular for the arrangement between two adjacent membrane electrode assemblies in a fuel cell stack according to the features of the preamble of claim 1 and a fuel cell assembly according to the features of the preamble of claim 20.
  • a fuel cell arrangement or a fuel cell stack (also referred to as a stack for short) consists of a plurality of fuel cells, which are electrically connected in series and are arranged plane-parallel one above the other.
  • Each fuel cell has, as electrodes in the form of gas diffusion electrodes, an anode, a cathode and an electrolyte arranged therebetween, for example in the form of a polymer electrolyte membrane (referred to as PEM for short), which together form a membrane electrode arrangement (MEA for short) ,
  • a bipolar plate (also called a bipolar separator plate unit) is arranged in each case between the membrane-electrode assemblies adjacent to the fuel cell stack.
  • the bipolar plate serves the spacing of adjacent membrane-electrode assemblies, the distribution of fuel cell reactants, such as fuel and oxidant, the adjacent membrane electrode assemblies and the removal of the reactants in each provided to the membrane electrode Arrangements for open channels, the removal of the heat of reaction via a guided in separate coolant channels coolant and the establishment of an electrical connection between the anode and the cathode of adjacent membrane-electrode assemblies.
  • the reactants used are a fuel and an oxidizing agent. Most gaseous reactants (in short: reaction gases) are used, for.
  • hydrogen or a hydrogen-containing gas eg reformate gas
  • oxygen or an oxygen-containing gas eg air
  • Reactants are all substances involved in the electrochemical reaction understood, including the reaction products such.
  • the respective bipolar plate consists of two plane-parallel interconnected moldings, in particular plates - an anode plate for connection to the anode of a membrane electrode assembly and a cathode plate for connection to the cathode of the other membrane-electrode assembly - or a plate with upper - and bottom introduced channel structures.
  • plates - an anode plate for connection to the anode of a membrane electrode assembly and a cathode plate for connection to the cathode of the other membrane-electrode assembly - or a plate with upper - and bottom introduced channel structures At the one of the membrane electrode assembly facing surface of the anode plate while anode channels for distributing a fuel along a membrane-electrode assembly are arranged, wherein at the other membrane electrode assembly facing surface of the cathode plate cathode channels for distribution of the oxidant over the other membrane electrode assembly are arranged.
  • the cathode channels and the anode channels are not connected to each other.
  • the cathode and anode channels are formed by depressions (referred to below as channels) which are separated from one another by elevations (referred to below as webs) on the surfaces of the anode and cathode plates which respectively face the membrane electrode assemblies.
  • the cathode and anode plate are preferably shaped, in particular hollow embossed.
  • the ridges and channels are produced, for example, discontinuously by forming, deep drawing, extrusion or the like, or continuously by rolling or drawing.
  • the power per square meter cell area and thus the efficiency of the fuel cell is to be increased.
  • DE 103 92 682 T5 describes a fuel cell which is formed by alternately stacking an electrolyte-electrode arrangement and a pair of separators.
  • the electrolyte-electrode assembly includes a pair of electrodes and an electrolyte interposed between the respective electrodes.
  • a reactant gas supply passage and a reactant gas discharge passage extend the respective separators in a stacking direction. Thereby, at least one oxygen-containing gas or a fuel gas as a reactant gas to a reactant gas flow field, which is formed in a Separator Structure, which faces said membrane electrode assembly, can be fed and discharged from this reactant gas flow field again.
  • At least the respective reactant gas supply passage or said reactant gas discharge passage includes first and second straight portions elongated along two sides from a corner of the respective separator.
  • a fuel cell stack which comprises a coolant supply passage and a coolant discharge passage. These extend in a stacking direction and are connected to a coolant flow field.
  • the coolant supply passage and the coolant discharge passage are disposed on horizontally opposite sides of a reactant gas flow field.
  • the fuel cell stack further includes a venting opening extending in the stacking direction, which is disposed on the coolant flow field such that it is higher than the highest part of the coolant flow field.
  • a drainage opening extending in the stacking direction is arranged on the coolant flow field in such a way that it lies lower than the lowest part of the coolant flow field.
  • US 2004/0106028 A1 describes a fuel cell in which a coolant supply passage, a coolant discharge passage and a vent opening in the stacking direction extend through a bipolar plate.
  • the coolant supply passage and the coolant discharge passage are arranged centrally at horizontally opposite ends of the bipolar plate.
  • a coolant flow field is arranged in between.
  • the vent opening for bleeding the coolant flow field is disposed above the coolant discharge passage. At least part of the vent opening is arranged above the highest part of the coolant flow field.
  • the invention has for its object to provide a bipolar plate for a fuel cell, which is improved over the known from the prior art bipolar plates.
  • an improved fuel cell assembly is to be specified.
  • the object is achieved in terms of the bipolar plate according to the invention by the features specified in claim 1.
  • the object is achieved by the features specified in claim 20.
  • a bipolar plate for a fuel cell in particular for the arrangement between two adjacent membrane electrode assemblies in a fuel cell stack, conventionally comprises two plates arranged plane-parallel to each other, one of which is formed as an anode plate and the other as a cathode plate, on the outer sides of each one Flow field is formed by introduced into the plates flow field channels, which are each traversed by a reactant, wherein between the anode plate and the cathode plate on the inner sides by negative structures of the flow field channels at least one coolant channel is formed.
  • only flow structures for the respective inflowing or outflowing reactant and the coolant or only flow structures for the two reactants are respectively formed in the reactant inflow regions and / or the reactant outflow regions of the bipolar plate.
  • the bipolar plate By reducing the number of flow structures, the bipolar plate is flatter, with deeper flow structures in the reactant inflow regions.
  • a fuel cell stack is therefore more compact executable. This is particularly important in applications in which only a limited space is available, for example in fuel cell vehicles, of great importance. Due to the lower flow structures, a better distribution of the reactants to flow field channels of the flow field can be achieved and a compressor power required for this lower, whereby an improved efficiency can be achieved by an increased power density of the fuel cell.
  • the coolant and the reactants in particular a cathode gas
  • flow largely parallel so that a favorable temperature gradient, ie a temperature progression rising from a start to one end of a cathode gas duct, can be achieved.
  • a favorable temperature gradient ie a temperature progression rising from a start to one end of a cathode gas duct.
  • reactant entrances, a Kuhlffeneingang, reactant exits and a coolant outlet are preferably arranged in respectively different, separate regions of the bipolar plate.
  • inflow channels are arranged in the reactant inflow regions and outflow channels in reactant outflow regions, whereby the reactants can be distributed optimally and uniformly to the channels of the respective flow field.
  • the coolant inlet preferably opens into the reactant inflow region of the bipolar plate and / or the coolant outlet leads away from the reactant outflow region of the bipolar plate. Since inflow channels or outflow channels are arranged in each of these areas, which occupy approximately half the thickness of the bipolar plate on only one plate, the other half of the thickness of the bipolar plate can be used for the coolant. As a result, both an optimal cooling of the reactants from the beginning and optimum delivery of both the reactants and the coolant to the flow field can be achieved.
  • inflow channels of a flow field inflow region and / or outflow channels of a flow field outflow region are preferably arranged on the anode plate in the flow direction perpendicular to the inflow channels of the flow field inflow region and / or outflow channels of the flow field outflow region on the cathode plate, unimpeded inflow of the coolant is also provided formed gaps between the intersecting inflow channels of Anode plate and cathode plate through in the flow field area and similarly ensured an unhindered outflow of the coolant.
  • the coolant inlet opens directly into the flow field region of the bipolar plate and / or the coolant outlet leads directly from the flow field region of the bipolar plate.
  • the reactant inflow region can be used for optimum inflow and distribution of the reactants, since the entire thickness of the bipolar plate can be used in half to form flow structures for the reactants on the anode plate or on the cathode plate.
  • the flow field channels of the flow field are arranged to run straight in the flow direction, whereby an optimal flow of the reactants and optimal utilization of the available space on the bipolar plate for the flow field and thus optimizing the power density of the fuel cell is reached.
  • a number of flow field channels twice the number of inflow channels are arranged in the flow field, wherein in each case one inflow channel of the flow field inflow region opens into two flow field channels of the flow field and two flow field channels of the flow field each open into an outflow channel of the flow field outflow region.
  • the available installation space of the bipolar plate in the longitudinal direction can be used optimally for the flow field or a longitudinal extent of the bipolar plate and thus a size of the fuel cell can be reduced.
  • the number of flow field channels in the flow field and / or the number of inflow channels in the flow field inflow region and / or the number of outflow channels in the flow field outflow region are identical. This is achievable by stretching reaction material entrances or reaction substance outlets in the longitudinal direction of the bipolar plate. In this way, the entire flow field is optimally supplied with the reactants, but this is associated with a slightly larger longitudinal extent of the flow field inflow region or the flow field-outflow region.
  • the flow field channels of the flow field in the flow direction are wavy or serpentine.
  • the channels covering the area of the flow field in a wave-like or serpentine manner i. an entire width of the bipolar plate can be used for the flow field by the channels covering the area of the flow field in a wave-like or serpentine manner.
  • a longitudinal extent of the flow field inflow region or the flow field outflow region is relatively small, so that the available space of the bipolar plate in the longitudinal direction can be used optimally for the flow field or a longitudinal extent of the bipolar plate and thus a size of the fuel cell can be reduced.
  • this also contributes to the parallel arrangement of the flow field channels of the flow field.
  • an optimal design of a channel structure can be used, depending on the respective intended use as well as other factors, such as, for example, production possibilities, expenditure and costs for the bipolar plate.
  • the flow field channels of the flow field and the inflow and outflow preferably have an identical depth, so that an optimal flow and flow through the flow field is secured with reactants and therefore a required compressor power compared to the prior art can be reduced and thus an optimal Power density of the fuel cell can be achieved.
  • the flow field inflow region and the flow field outflow region can be used as active regions of the fuel cell for generating electrical energy, whereby a power density of the fuel cell is significantly optimized.
  • corresponding channels of the anode plate and the cathode plate have an identical flow area, i.
  • the thickness of the bipolar plate can be used in each case half of channels of the anode plate and the cathode plate, this being true for the entire channel structure of the bipolar plate by the solution according to the invention, so that an optimal supply of the fuel cell with reaction gases ensures an optimal sequence of the electrochemical reaction for energy generation is.
  • the flow directions of the reactants and the coolant are equal to or opposite to each other, i. either in the same direction or parallel in the opposite direction.
  • a gaseous reaction or fuel eg. As hydrogen or a hydrogen-containing gas, or an oxidizing agent, for.
  • oxygen or an oxygen-containing gas for.
  • all discharge channels of the respective plate expire expediently into a common reagent outlet, via which water or steam and / or a residual combustion gas can be discharged as reaction products.
  • the two plates are made of metal.
  • the channel structure in the respective plate by forming stretching, deep drawing, extrusion or the like, or continuously by rolling or drawing can be introduced.
  • the bipolar plate according to the invention is preferably used in a fuel cell arrangement.
  • the fuel cell arrangement may be a number of stacked polymer electrolyte membrane fuel cells, between each of which a bipolar plate is arranged.
  • FIG. 3 is a schematic representation of a bipolar plate with undulating channels
  • Fig. 5 is a schematic representation of a bipolar plate with the same number
  • Fig. 6 shows another embodiment of the solution according to the invention. Corresponding parts are provided in all figures with the same reference numerals.
  • FIG. 1 shows a schematic representation of a bipolar plate B.
  • the illustrated bipolar plate B comprises two plane-parallel plates A, K, of which one is formed as the anode plate A and the other as the cathode plate K.
  • a respective flow field S is formed by flow field channels SK introduced into the plates A 1 K.
  • These flow fields S are each traversed by a reactant, which in this way a gas diffusion layer, not shown, for example, a membrane-electrode assembly, a fuel cell for power generation can be fed.
  • coolant channels KK are formed on their insides by negative structures of the flow field channels SK.
  • a depth of the flow field channels SK in each outer side of the plate A, K corresponds approximately to half the thickness of the bipolar plate B.
  • the flow field channels SK of the two plates A, K are arranged exactly above one another so that bottom regions of the flow field channels SK touch the plates A 1 K.
  • an effective and cost-effective support structure of the bipolar plate B is formed, on the other between the two plates A, K between the contacting with the bottom region flow field channels SK gaps are formed, which are used as coolant channels KK.
  • FIG. 2 shows a cross section through a flow field region of the bipolar plate B, which illustrates the structure of an entire channel structure of the bipolar plate B in this area.
  • the two plates A, K of the bipolar plate B with the respective flow field channels SK, which rest on one another, and the coolant channels KK formed thereby between the two plates A, K.
  • the flow field channels SK on the outer sides of the plates A, K use in each case half the thickness of the bipolar plate B, between the full thickness of the bipolar plate B is available for the coolant.
  • reaction material inputs RA, RK or reaction material outputs and a coolant inlet KE or a coolant outlet are arranged. Only one transverse side of the bipolar plate B is shown in FIG. 1, ie two reagent inputs RA 1 RK and one coolant input KE, since the corresponding outputs are arranged analogously thereto.
  • Reactant inputs RA, RK include a reagent inlet RA on the cathode plate K of the bipolar plate B and a reagent inlet RK on the anode side A of the bipolar plate B.
  • the coolant inlet KE is provided for introducing a coolant between the plates A, K of the bipolar plate B.
  • the reagent inputs RA, RK and outputs and the coolant inlet KE and output on the bipolar plate B are all spatially separated from each other.
  • a reactant inlet area RE arranged, analogous to, not shown here, immediately before the respective Christsstoffausgang a reactant outflow area.
  • inflow channels EK for inflowing the respective reactant or outflow channels for outflow of the respective reaction substance are arranged in each of these reactant inflow regions RE and reactant outflow regions in each case only on one plate A, K.
  • the respective full channel depth is half the thickness the bipolar plate B corresponds, have.
  • a flow field inflow region SZ or an unillustrated flow field outflow region is arranged between the reactant inflow regions RE or the reactant outflow regions and the flow field S.
  • a flow field inflow region SZ or an unillustrated flow field outflow region is arranged between the reactant inflow regions RE or the reactant outflow regions and the flow field S.
  • inflow passages EK or outflow passages of both plates A, K of the bipolar plate B are still formed with full channel depth, as the coolant through spaces between the crossing inflow channels EK and outflow to the flow field S feasible or can be discharged from this.
  • the flow field inflow region SZ or the flow field outflow region can be used in addition to the flow field S as active regions of the fuel cell for energy generation optimal use of a space of the fuel cell is reached.
  • a performance of such a fuel cell is therefore significantly increased with the same space requirements or a space requirement of the fuel cell can be significantly reduced at the same power. This is particularly important when using fuel cells, for example for power generation in vehicles of great importance, since only a very limited space is available.
  • the coolant and the reactants flow largely parallel over large parts of the bipolar plate B, thereby producing a favorable temperature gradient, ie. a temperature profile increasing from a beginning to an end of the channel structure can be achieved.
  • a little moistened or not humidified cathode gas can be introduced without the drying out of a polymer electrolyte membrane in the region of the beginning of a cathode gas channel is to be feared.
  • the ability of the cathode gas to absorb water arising during the electrochemical reaction increases. As a result, no liquid water can form, which could clog the entire channel structure.
  • an inflow channel EK of the flow field inflow region SZ or an outflow channel of the flow field outflow region is connected to two flow field channels SK of the flow field S so that the reactants can be distributed uniformly to the respective flow field S or can be diverted therefrom ,
  • FIG. 3 shows a further possibility, on the one hand, of making the reactant entrances RA, RK or outputs as small as possible, but nevertheless to use a full width of the bipolar plate B for the flow field S.
  • this is realized by wave-shaped flow field channels SK of the flow field S.
  • an area available for the flow field S on the bipolar plate B can also be used optimally in order to achieve an optimum power density of the fuel cell.
  • the bipolar plate B for example, longer or shorter executable in the longitudinal direction and optimally adaptable to the fuel cell or the fuel cell to be manufactured optimally adapted to the respective requirements, for example to an available space in a vehicle.
  • the flow field channels SK of the flow field S on the anode plate A of the bipolar plate B are arranged analogously thereto.
  • the reactant inflow region RE, the reactant outflow region as well as the flow field inflow region SZ and the flow field outflow region of the illustrated embodiment are analogous to the embodiment already illustrated and explained in FIG.
  • FIG. 4 shows a further embodiment.
  • a width of the flow field S in the exemplary embodiment illustrated here is subdivided into three regions B1, B2, BM.
  • a first outer region B1 extends along a first longitudinal side of the flow field S and has approximately one third of the width of the flow field S
  • a second outer region B2 extends along a second longitudinal side of the flow field S and likewise has approximately one third of the width of the Flow field S on.
  • a middle one Region BM of the flow field S extends between the first outer region B1 and the second outer region B2 of the flow field S in a middle third of the width of the flow field S.
  • the flow field channels SK extend from the flow field inflow region SZ in the flow direction through the first outer region B1 of the flow field S to a transverse side of the flow field S opposite the flow field inflow region SZ, where they are in a 180 ° curve in the middle region BM of the flow field S open.
  • the flow field channels SK run parallel and counter to the flow direction to a transverse side of the flow field S opposite the flow field discharge region, at which they open, describing a 180 ° curve, into the second outer region B2 of the flow field S. and in this second outer region B2 of the flow field S run parallel and in the flow direction to the flow field discharge region.
  • the flow field channels SK of the illustrated embodiment form three serpentines, which run through these three regions B1, B2, BM of the flow field S.
  • the illustrated embodiment thus offers a further possibility of making the reagent entrances RA, RK or outputs as small as possible, but nevertheless to utilize a full width of the bipolar plate B for the flow field S.
  • a larger number of serpentines are possible in other embodiments.
  • the reactant inflow region RE, the reactant outflow region as well as the flow field inflow region SZ and the flow field outflow region of the illustrated embodiment are similar to the embodiment already illustrated and explained in FIG.
  • inflow channels EK are formed only on one plate A, K.
  • FIG. 5 shows a further exemplary embodiment.
  • the flow field channels SK of the flow field S analogous to Figure 1, run straight again.
  • an identical number of inflow channels EK are arranged both in the flow field S and in the flow field inflow regions SZ or flow field outflow regions.
  • the Reagent inputs RA, RK and outputs increased. Since, however, it must furthermore be ensured that a channel structure is formed in each of the respective reactant inflow regions RE or reactant outflow regions only on one plate A, K, these are
  • Reactant inputs RA, RK and exits in the longitudinal direction of the bipolar plate B increases.
  • an identical number of inflow passages EK can be led out of the reactant material inlets RA, RK, or an identical number of outflow passages can be introduced into the reactant outlets, as are arranged in the flow field S.
  • FIG. 6 shows a further embodiment of the solution according to the invention, which, however, deviates in its mode of operation from the previously illustrated embodiments.
  • this embodiment between the reagent entrances RA, RK and -aus réellen and the flow field S, only the reactant inlet area RE or reactant outflow area of the bipolar plate B is arranged, in which no inflow channels EK or outflow as flow structures, but only Leit- and Support elements L are arranged.
  • These have both a guiding function for the inflowing reactants in order to distribute them optimally to the flow field channels SK of the flow field S, as well as analogous to channel walls of the flow field channels SK, a support function for the voltage applied to these, not shown gas diffusion layer of the fuel cell.
  • the thickness of the bipolar plate B can be used in half for the flow structures of the reactants, whereby an optimal inflow of the reactants and an optimal distribution to the flow field channels SK of the flow field S is ensured, with the already described advantages of the inventive solution over the prior art ,
  • the coolant inputs KE and outputs are arranged in this embodiment, the side of the flow field S, respectively in the region of an input or output of the flow field S.
  • the flow field channels SK of the flow field S for the reactants in these areas partially not with the full Can be executed channel depth, ie in some places, the channel bottoms must not touch, so that passages for a cross-connection between the coolant inputs KE and -aus saun and the cooling channels KK of the flow field region of the bipolar plate B are formed to flow through the coolant.
  • this embodiment of the solution according to the invention is also associated with considerable advantages due to a higher power density, an optimum inflow and distribution of the reactants and a lower required compressor output.
  • bipolar plates B By a large number of possible embodiments of bipolar plates B according to the solution according to the invention, an optimal embodiment can be used for the respective field of application and in this way a fuel cell or a fuel cell stack can be optimized and produced, for example, depending on the required power and the available installation space, wherein by means of the invention Solution over the prior art more efficient or smaller fuel cells can be produced.

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  • Sustainable Development (AREA)
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  • Fuel Cell (AREA)

Abstract

L'invention concerne une plaque bipolaire (B) pour une pile à combustible, avec au moins deux plaques (A, K) formant des plans parallèles entre eux, dont l'une est une plaque anodique (A) et l'autre est une plaque cathodique (K). Sur leurs faces extérieures est formé un champ d'écoulement (S) dans des canaux de champ d'écoulement (SK) formés dans les plaques (A, K) et pouvant être parcourus par une substance réactive. Entre la plaque anodique (A) et la plaque cathodique (K), il est formé au moins un canal de fluide de refroidissement (KK) sur leurs faces intérieures du fait des structures en négatif des canaux de champ d'écoulement (SK). Selon l'invention, il est prévu de former dans les zones d'entrée de substance réactive (RE) et/ou dans les zones de sortie des substances réactives de la plaque bipolaire (B) uniquement des structures d'écoulement pour la substance réactive considérée entrant ou sortant et pour le fluide de refroidissement, ou uniquement des structures d'écoulement pour les deux substances réactives.
PCT/EP2009/007591 2008-11-12 2009-10-23 Plaque bipolaire pour un agencement de piles à combustible, en particulier destinée à être placée entre deux agencements d'électrodes à membrane dans un empilement de piles à combustible WO2010054744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008056900A DE102008056900A1 (de) 2008-11-12 2008-11-12 Bipolarplatte für eine Brennstoffzellenanordnung, insbesondere zur Anordnung zwischen zwei benachbarten Membran-Elektroden-Anordnungen in einem Brennstoffzellenstapel
DE102008056900.3 2008-11-12

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Cited By (5)

* Cited by examiner, † Cited by third party
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WO2014001842A1 (fr) 2012-06-26 2014-01-03 Powercell Sweden Ab Plaque de champ de propagation pour pile à combustible
WO2016042268A1 (fr) 2014-09-19 2016-03-24 Commissariat à l'énergie atomique et aux énergies alternatives Plaque de guidage d'ecoulement d'un fluide pour reacteur electrochimique et ensemble comportant cette plaque
US10230117B2 (en) 2013-06-06 2019-03-12 Volkswagen Ag Bipolar plate, fuel cell having such a plate and motor vehicle having such a fuel cell
CN110492126A (zh) * 2019-05-16 2019-11-22 张国胜 双极板及包含该双极板的燃料电池电堆和发电系统
CN115516670A (zh) * 2020-10-26 2022-12-23 奥迪股份公司 双极板和燃料电池堆

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DE102013226815A1 (de) 2013-12-20 2015-06-25 Robert Bosch Gmbh Brennstoffzelle
DE102014206335A1 (de) * 2014-04-02 2015-10-08 Volkswagen Ag Bipolarplatte und Brennstoffzelle mit einer solchen
DE102014206333A1 (de) 2014-04-02 2015-10-08 Volkswagen Ag Bipolarplatte sowie Brennstoffzelle mit einer solchen
DE102019211056B4 (de) * 2019-07-25 2025-01-23 Robert Bosch Gmbh Brennstoffzellenstack für die Bereitstellung elektrischen Stroms
DE102020203044A1 (de) * 2020-03-10 2021-09-16 Robert Bosch Gesellschaft mit beschränkter Haftung Brennstoffzelleneinheit
DE102021205366A1 (de) 2021-05-27 2022-12-01 Robert Bosch Gesellschaft mit beschränkter Haftung Verteilerplatte für eine Bipolarplatte eines Brennstoffzellensystems
CN114824347B (zh) * 2022-03-31 2024-07-30 潍柴巴拉德氢能科技有限公司 一种双极板和燃料电池
WO2024235393A1 (fr) 2023-05-15 2024-11-21 Schaeffler Technologies AG & Co. KG Plaque bipolaire
DE102024112071A1 (de) 2023-05-15 2024-11-21 Schaeffler Technologies AG & Co. KG Bipolarplatte

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US20050064270A1 (en) * 2003-09-24 2005-03-24 Marianowski Leonard G. Fuel cell bipolar separator plate
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014001842A1 (fr) 2012-06-26 2014-01-03 Powercell Sweden Ab Plaque de champ de propagation pour pile à combustible
CN104584303A (zh) * 2012-06-26 2015-04-29 瑞典电池公司 用于燃料电池的流场板
US9947943B2 (en) 2012-06-26 2018-04-17 Powercell Sweden Ab Flow field plate for a fuel cell
US10230117B2 (en) 2013-06-06 2019-03-12 Volkswagen Ag Bipolar plate, fuel cell having such a plate and motor vehicle having such a fuel cell
WO2016042268A1 (fr) 2014-09-19 2016-03-24 Commissariat à l'énergie atomique et aux énergies alternatives Plaque de guidage d'ecoulement d'un fluide pour reacteur electrochimique et ensemble comportant cette plaque
CN110492126A (zh) * 2019-05-16 2019-11-22 张国胜 双极板及包含该双极板的燃料电池电堆和发电系统
CN115516670A (zh) * 2020-10-26 2022-12-23 奥迪股份公司 双极板和燃料电池堆

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