WO2015161913A1 - Fuel cell assembly - Google Patents

Fuel cell assembly Download PDF

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Publication number
WO2015161913A1
WO2015161913A1 PCT/EP2015/000648 EP2015000648W WO2015161913A1 WO 2015161913 A1 WO2015161913 A1 WO 2015161913A1 EP 2015000648 W EP2015000648 W EP 2015000648W WO 2015161913 A1 WO2015161913 A1 WO 2015161913A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel cell
cell stack
housing
disposed
cell assembly
Prior art date
Application number
PCT/EP2015/000648
Other languages
French (fr)
Inventor
Simon Hollnaicher
Alfred Kolbe
Dietmar Mirsch
Andreas Röntgen
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 WO2015161913A1 publication Critical patent/WO2015161913A1/en

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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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/028—Sealing means characterised by their material
    • 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
    • H01M8/0267—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
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
    • 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
    • H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
    • H01M8/2485—Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/247—Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
    • H01M8/2475—Enclosures, casings or containers of fuel cell stacks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the invention relates to a fuel cell assembly according to the preamble of claim 1 .
  • a fuel cell stack which has a first connector base, a first insulating plate, a first end plate and a first insulating collar.
  • the insulating collar has a first tubular part and a first flange.
  • the first tubular part is provided in a first media manifold and the first flange is disposed at an end of the first tubular part.
  • the other end of the first tubular part protrudes from the first media manifold and is in contact with an inner circumferential surface of the first media manifold, wherein the first tubular part is displaceable relative to the inner circumferential surface by means of a sealing element of an outer circumferential surface of the first tubular part.
  • the first flange is connected to the first insulating plate by means of a sealing element disposed on the end side.
  • a fuel cell assembly including a fuel cell stack with a plurality of fuel cells, a detachable clamp for retaining the components of the fuel cell stack and a housing for receiving the fuel cell stack.
  • the housing includes protruding end pieces at a closed end, which are provided with seals. The end pieces are connected to channel structures for supplying and discharging gases and electrolytes.
  • the invention is based on the object to specify a fuel cell assembly improved with respect to the prior art.
  • the object is solved by a fuel cell assembly having the features specified in claim 1.
  • a fuel cell assembly includes a fuel cell stack, at least one end plate closing the fuel cell stack on the end side, and a number of connections for a
  • the fuel cell assembly includes as components a housing, in which the fuel cell stack is disposed, a media distributor unit, through which a number of lines for media supply to the flow channels and/or for media discharge from the flow channels is disposed, and a number of sealing elements for sealing the components to each other.
  • a first sealing element are connected to each other by means of each one web, wherein one of the first sealing elements connected to each other is respectively disposed between two abutment surfaces of a line opposing each other and a connection and wherein an end face of the sealing elements respectively faces an abutment surface of the two components and is axially pressed against it, i.e. perpendicularly to the end faces.
  • the thus formed fuel cell assembly allows simple assembly in particular of the media distributor unit since exact positioning of the lines with respect to the connections is not required by means of the axially pressed first sealing elements, but slight lateral offsets are also tolerated.
  • the arrangement of multiple first sealing elements connected to each other instead of multiple separate first sealing elements also allows simplified assembly. Furthermore, thereby, sealing of the at least one line with respect to the flow channel of the fuel cell stack is improved with respect to the prior art. Moreover, disassembly is simplified with respect to the prior art, since corresponding components of the fuel cell assembly can be pulled past each other in disassembly, i.e.
  • the first sealing elements are each formed in a shape closed in circumferential direction, wherein the webs each radially protrude from the circumference.
  • the web allows exact pressing of the first sealing elements since it constitutes a resistance such that the first sealing elements for example cannot be encompassed by an inner wall of the lines.
  • the first sealing elements connected to each other and the webs are formed integrally with each other, whereby manufacture of the connection of the first sealing elements can be simply and inexpensively realized.
  • the first sealing elements are each formed of an electrically insulating material.
  • a material absorbing electromagnetic waves is suitable to this, e.g. ethylene-propylene-diene rubber, hydrogenated acrylonitrile butadiene rubber or fluorocarbon rubber.
  • the housing includes a housing lid disposed parallel to the at least one end plate in a longitudinal orientation of the fuel cell stack and including at least one recess for passing through at least one of the connections or at least one of the tubular lines.
  • the housing lid is connected. to the other component of the housing by screwing.
  • the recess introduced into the housing lid allows connection between the end plate of the fuel cell stack and the media distributor plate such that media can be supplied to the fuel cell stack and can again be discharged from the fuel cell stack.
  • Media to be supplied to the fuel cell stack are for example reactants, i.e. a fuel, for example hydrogen, and an oxidant, for example oxygen.
  • a medium to be discharged from the fuel cell stack is for example a reaction product forming from the reactants, usually water.
  • a medium, which is to be supplied to and also again to be discharged from the fuel cell stack is for example a tempering medium for cooling and/or heating the fuel cell stack.
  • the housing lid includes at least one second sealing element, which is disposed on an end side facing the end plate and encloses the at least one recess on the edge side.
  • the housing lid is sealed with respect to the end plate, wherein the at least one second sealing element is axially pressed against the end plate and against the housing lid.
  • the housing lid includes a third sealing element, which is disposed on an end side of the housing lid facing the housing and encloses an edge area of the end side at least in sections. Thereby, the housing lid is sealed to the housing, whereby an
  • a form-fit between the housing lid and the housing offers an alternative to this, which is realized by means of correspondingly formed undercuts. By introducing such undercuts, cost can be saved with respect to the use of the third sealing element.
  • the housing has at least one fixing opening, into which a receiving plate with a feed-through opening for a fixing means is inserted.
  • the at least one fixing opening and the feed-through opening are formed in the shape of an elongated hole in particular in order to allow length compensation for exact positioning and attachment of the fuel cell stack in the housing.
  • the fixing means e.g. screws, are displaceable in the longitudinal orientation of the housing in the elongated holes, at least before completely screwing in tight.
  • the end plate includes further first sealing elements on an end side facing the fuel cell stack, which each are disposed between an abutment surface of an edge area of one of the connections and an abutment surface of an edge area of one of the flow channels.
  • the connections are additionally sealed with respect to the flow channels.
  • Fig. 1 schematically a partial exploded illustration of a fuel cell assembly with a media distributor unit in a perspective front view
  • FIG. 2 schematically an enlarged section of the fuel cell assembly according to figure 1 with a front side of an end plate
  • FIG. 3 schematically an enlarged section of the fuel cell assembly according to figure 1 with a rear side of the end plate
  • Fig. 4 schematically a partial exploded illustration of the fuel cell assembly with the media distributor unit in perspective rear view
  • Fig. 5 schematically a partial exploded illustration of a fuel cell assembly according to the prior art.
  • FIGS 1 to 4 show a fuel cell assembly B according to the invention including a fuel cell stack 1 , a media distributor unit 2 and a housing 3 in various views.
  • figure 1 shows a partial exploded view of the fuel cell assembly B with the media distributor unit 2 in perspective front view.
  • the figures 2 and 3 each show an enlarged section of the fuel cell assembly B according to figure 1 , wherein an end plate 1 .1 closing the fuel cell stack 1 on the end side is illustrated in more detail, and figure 2 shows a lower area of a front side and figure 3 shows a lower area of a rear side of the end plate 1 .1 .
  • Figure 4 shows the fuel cell assembly B in partial exploded illustration with the media distributor unit 2 in perspective rear view.
  • the fuel cell assembly B according to the invention is in particular suitable and/or formed for integration in a fuel cell system for generating driving energy in a vehicle.
  • the fuel cell stack 1 includes a plurality of fuel cells not illustrated in more detail, by means of which a chemical reaction energy is converted into electrical energy.
  • a closing end plate 1 .1 is disposed, wherein one of the end plates 1 .1 is a cathode end plate and the other of the end plates 1.1 is an anode end plate.
  • the end plate 1.1 shown in the present embodiment, facing the media distributor unit 2, is for example the cathode end plate.
  • the end plates 1.1 are for example each formed of a metallic material and constitute a flow-technical interface for supply and discharge of media for an operation of the fuel cell assembly B.
  • Media to be supplied to the fuel cell stack 1 are for example a first reactant and a second reactant, i.e. a fuel, for example hydrogen, and an oxidant, for example oxygen, wherein the oxygen for example is to be supplied to the fuel cell stack 1 in the form of air.
  • a medium to be discharged from the fuel cell stack 1 is for example a reaction product forming from the reactants, usually water, i.e. the media distributor unit 2 preferably also contributes to the drainage of the fuel cell stack 1. Furthermore, a not consumed portion of the respective reactant can also be again to be discharged from the fuel cell stack 1.
  • the not consumed portion of the hydrogen is conveniently to be supplied again to the fuel cell stack 1 via a return channel not illustrated in more detail such that this portion of the reactant hydrogen is then a medium to be discharged and again to be supplied.
  • a medium which is to be supplied to and also again to be
  • a tempering medium for cooling and/or heating the fuel cell stack 1 for example cooling water or another cooling or tempering liquid.
  • the end plate 1.1 facing the media distributor unit 2 has a number of connections 1.1.1 associated with a number of flow channels SK, wherein the flow channels SK each lead into the fuel cell stack 1 starting from the connections 1.1.1.
  • connections 1.1.1 are each formed as a passage opening and constitute an input or output of the flow channels SK.
  • the end plate 1 .1 has each three connections 1 .1 .1 in a lower area and in an upper area, which collectively protrude axially from an end side of the end plate 1 .1 towards the media distributor unit 2 forming a collar.
  • the edge areas of the connections 1.1.1 can also terminate with the surface of the end plate 1.1 on the edge side.
  • connections 1.1.1 in the upper area constitute for example interfaces for supplying the tempering medium, the oxidant and the fuel to the fuel cell stack 1 .
  • the connections 1.1.1 in the lower area constitute interfaces for discharge of the tempering medium, the air with the not consumed portion of the oxygen and the not consumed portion of the hydrogen from the fuel cell stack 1.
  • the edge areas of the connections 1.1.1 facing the media distributor unit 2 are each enclosed by a first sealing element 4.1 , which has a shape closed in circumferential direction and corresponding to the edge area of the respective connection 1 .1.1 .
  • a first sealing element 4.1 is respectively connected to the adjacent disposed first sealing element 4.1 by means of a web 4.1.1 , wherein the webs 4.1.1 are preferably integrally formed with the first sealing elements 4.1.
  • the connections 1 .1.1 can additionally also have such first sealing elements 4.1 on the side facing the fuel cell stack 1 , which preferably are formed identically to the first sealing elements 4.1 on the opposing side of the end plate 1.1 .
  • the first sealing elements 4.1 can be manufactured in a common process for both end sides of the end plate 1.1.
  • An assembly of the first sealing elements 4.1 is particularly simplified by the connection by means of the webs 4.1.1 since the sealing elements 4.1 are positioned as one part over the connections 1.1.1.
  • the webs 4.1.1 prevent radial pressing of the first sealing elements 4.1 in the assembly of the media distributor unit 2, which is elaborated in the following.
  • the first sealing elements 4.1 are preferably formed of an electrically insulating material, which absorbs electromagnetic waves, such as for example ethylene-propylene-diene rubber, hydrogenated acrylonitrile butadiene rubber or fluorocarbon rubber. Therein, the first sealing elements 4.1 in particular serve for sealing connection between the
  • connections 1.1.1 and tubular lines L which serve for supplying the media to the flow channels SK and which are each passed through the media distributor unit 2 at least in sections.
  • the tubular lines L are described in more detail in the following.
  • the first sealing elements 4.1 are each disposed between the edge area of the connection 1.1 .1 and an abutment surface of one of the tubular lines L and axially pressed against it in the assembled state of the fuel cell assembly B. I.e., an end face of the first sealing element 4.1 faces the edge area of the connection 1 .1.1 and the other end face faces the abutment surface of the tubular line L, wherein a pressing force acts
  • an end face of the first sealing elements 4.1 is a side facing the media distributor unit 2 and the end plate 1.1.
  • the first sealing elements 4.1 disposed on the opposing end side of the end plate 1.1 are axially pressed with an abutment surface of the fuel cell stack 1 in the edge area of the flow channels SK. Thereby, the end plate 1.1 is also sealed against the fuel cell stack 1.
  • the webs 4.1.1 prevent enclosing the first sealing elements 4.1 by an inner wall of the tubular lines L since they form a resistance in pressing the media distributor unit 2 with the fuel cell stack 1 and the housing 3. Thereby, slight offsets in assembly of the media distributor unit 2 are also tolerated such that it is simpler to assemble with respect to seals to be radially pressed.
  • the sealing connection in particular an electrical contact of voltage carrying parts of the fuel cell stack 1 with electrically conductive parts of the fuel cell assembly, e.g. components of the media distributor unit 2, is avoided.
  • the media distributor unit 2 is formed of two base plates 2.1 , 2.2 disposed on top of each other.
  • the tubular lines L are each disposed between the two base plates 2.1 , 2.2 at least in sections. Therein, the tubular lines L are formed as insert parts, which are inserted in insertion formations 2.3 of the media distributor unit 2.
  • At least one of the two base plates 2.1 , 2.2 is formed of a metallic material at least in certain areas, preferably completely, for example of an aluminum or magnesium alloy, for example in a casting method.
  • both base plates 2.1 , 2.2 are thus formed.
  • the media distributor unit 2 is connected to the fuel cell stack 1 via a form- and force-fit connection to the end plate 1.1.
  • An attachment of the media distributor unit 2 to the end plate 1.1 is effected by screwing in the area of the connections 1.1.1 on the fuel cell stack 1 , wherein corresponding screw elements are passed through screw openings of the base plates 2.1 , 2.2 provided for this and are for example screwed in threads formed in the end plate 1.1 such that the base plates 2.1 , 2.2 are pressed against each other and against the fuel cell stack 1 by means of screw heads of the screw elements.
  • the media distributor unit 2 is connected, in particular screwed, to a housing lid 3.1 in form- and force-fit manner, in analogous manner to the end plate 1.1.
  • the housing lid 3.1 is disposed parallel to the end plate 1.1 in longitudinal orientation of the fuel cell stack 1 such that it is disposed between the end plate 1.1 and the media distributor unit 2.
  • the housing lid 3.1 has a recess 3.1.1 , respectively, through which the connections 1.1.1 of the flow channels SK protrude if the connections 1.1.1 in the form of the collar axially protrude in the direction of the media distributor unit 2, as it is shown in the present embodiments.
  • the tubular lines L protrude through the recesses 3.1.1 if the edge areas of the connections 1.1 .1 terminate with the end side of the end plate 1 .1 on the edge side.
  • the housing lid 3.1 each has a second sealing element 4.2 in an edge area of the recess 3.1.1 , in particular on an end side facing the end plate 1 .1 , which has a shape closed in the circumferential direction and thus completely encloses the recess 3.1 .1 in the present embodiment.
  • the second sealing elements 4.2 seal the housing lid 3.1 with respect to the end plate 1.1 , wherein the second sealing elements 4.2 are each axially pressed against the housing lid 3.1 and against an edge area of the connections 1 .1.1 extending beyond the first sealing elements 4.1 , e.g. an edge area of the collar, i.e. the pressing force acts perpendicularly to the end faces of the second sealing elements 4.2, wherein an end face of the second sealing elements 4.2 herein corresponds to a side facing the housing lid 3.1 and the end plate 1.1 .
  • the second sealing elements 4.2 are formed of an electrically insulating material analogous to the first sealing elements 4.1 .
  • the housing lid 3.1 has a third sealing element 4.3, which encloses an edge area of the end side of the housing lid 3.1 facing the end plate 1 .1 in sections.
  • the third sealing element 4.3 can also completely enclose the previously mentioned edge area.
  • the third sealing element 4.3 seals the housing lid 3.1 with respect to the housing 3 such that a shielding of the fuel cell stack 1 to the outside is thereby achieved and
  • the housing lid 3.1 and the housing 3 can also have corresponding undercuts, whereby the housing lid 3.1 can be disposed on the housing 3 in form-fit manner.
  • the form-fit has a step in the cross-sectional profile such that exit of electromagnetic radiation can be prevented or at least reduced.
  • the step-shaped form-fit between the housing lid 3.1 and the housing 3 therein offers a considerable cost reduction with respect to the arrangement of the third sealing element 4.3, the material procuring costs of which are comparatively high.
  • the housing lid 3.1 closes the housing 3 on the end side in the area of the end plate 1.1 , wherein the fuel cell stack 1 is disposed in the housing 3. Therein, the fuel cell stack 1 is clamped by means of clamping means, e.g. clamping bands.
  • clamping means e.g. clamping bands.
  • the housing 3 is conveniently sufficiently stably formed.
  • the housing 3 is formed of metal or of a combination of metallic material and plastic and/or carbon fiber reinforced carbon (CFC).
  • CFC carbon fiber reinforced carbon
  • the housing 3 For attaching the fuel cell stack 1 in the housing 3, the housing 3 has fixing openings 3.2, into which receiving plates 3.3 can be inserted. In this manner, the fuel cell stack 1 can be screwed to the housing 3 by means of fixing screws 3.4. Both the fixing openings 3.2 and the feed-through openings for the fixing screws 3.4 in the receiving plates 3.3 are formed in the shape of elongated holes to allow length compensation for exact positioning and attachment of the fuel cell stack 1 in the housing 3, such that the fixing screws 3.4 are displaceable in the elongated holes in longitudinal direction of the housing 3, at least before completely screwing in tight.
  • a not illustrated seal and an also not illustrated cover are respectively to be fitted on the receiving plates 3.3.
  • the respective cover is to be sealingly attached to the housing 3 together with the respective seal and the respective receiving plate 3.3.
  • FIG 5 a fuel cell assembly B according to the prior art is shown, wherein the tubular lines L are illustrated without the media distributor unit 2.
  • the connections 1.1.1 disposed on the end plate 1.1 have separate seals, the function of which corresponds to the function of the first sealing elements 4.1 , namely sealing the tubular lines L with respect to the connections 1.1.1.
  • the seals are enclosed by the inner wall of the respective tubular line L such that the seals are radially pressed with the tubular lines L, i.e. the pressing force acts radially on the outer circumference of the seals.
  • connections 1.1.1 for example serving for supplying and discharging the oxidant to the fuel cell stack 1 or from the fuel cell stack 2 each have a seal, which are formed analogously to the second sealing elements 4.2 without webs 4.1.1 and are axially pressed with the connections 1.1 .1 and the tubular line L.
  • the tubular lines L have to be exactly positioned to ensure a sufficiently high seal of the tubular lines L to the connections 1.1.1 .

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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

The invention relates to a fuel cell assembly (B) including the following components: a fuel cell stack (1), at least one end plate (1.1), which closes the fuel cell stack (1) on the end side, including a number of connections (1.1.1) for a corresponding number of flow channels (SK) disposed in the fuel cell stack (1), a housing (3), in which the fuel cell stack (1) is disposed, a media distributor unit (2), through which a number of tubular lines (L) for media supply to the flow channels (SK) and/or for media discharge from the flow channels (SK) is disposed, and a number of sealing elements (4.1 to 4.3) for sealing the components to each other. Therein, it is provided that at least two first sealing elements (4.1) are connected to each other by means of each one web (4.1.1), wherein each one of the first sealing elements (4.1) connected to each other is disposed between abutment surfaces of a tubular line (L) opposing each other and a connection (1.1.1), and wherein each one end face of the first sealing elements (4.1 ) faces an abutment surface of a component and is axially pressed against it.

Description

Fuel cell assembly
The invention relates to a fuel cell assembly according to the preamble of claim 1 .
In US 2013/0230785 A1 , a fuel cell stack is disclosed, which has a first connector base, a first insulating plate, a first end plate and a first insulating collar. The insulating collar has a first tubular part and a first flange. Therein, the first tubular part is provided in a first media manifold and the first flange is disposed at an end of the first tubular part. The other end of the first tubular part protrudes from the first media manifold and is in contact with an inner circumferential surface of the first media manifold, wherein the first tubular part is displaceable relative to the inner circumferential surface by means of a sealing element of an outer circumferential surface of the first tubular part. The first flange is connected to the first insulating plate by means of a sealing element disposed on the end side.
Furthermore, in US 2009/0197149 A1 , a fuel cell assembly is disclosed, including a fuel cell stack with a plurality of fuel cells, a detachable clamp for retaining the components of the fuel cell stack and a housing for receiving the fuel cell stack. The housing includes protruding end pieces at a closed end, which are provided with seals. The end pieces are connected to channel structures for supplying and discharging gases and electrolytes.
The invention is based on the object to specify a fuel cell assembly improved with respect to the prior art.
According to the invention, the object is solved by a fuel cell assembly having the features specified in claim 1.
Advantageous configurations of the invention are the subject matter of the dependent claims. As components, a fuel cell assembly includes a fuel cell stack, at least one end plate closing the fuel cell stack on the end side, and a number of connections for a
corresponding number of flow channels leading into the fuel cell stack. Furthermore, the fuel cell assembly includes as components a housing, in which the fuel cell stack is disposed, a media distributor unit, through which a number of lines for media supply to the flow channels and/or for media discharge from the flow channels is disposed, and a number of sealing elements for sealing the components to each other. According to the invention, it is provided that at least two first sealing elements are connected to each other by means of each one web, wherein one of the first sealing elements connected to each other is respectively disposed between two abutment surfaces of a line opposing each other and a connection and wherein an end face of the sealing elements respectively faces an abutment surface of the two components and is axially pressed against it, i.e. perpendicularly to the end faces.
The thus formed fuel cell assembly allows simple assembly in particular of the media distributor unit since exact positioning of the lines with respect to the connections is not required by means of the axially pressed first sealing elements, but slight lateral offsets are also tolerated. The arrangement of multiple first sealing elements connected to each other instead of multiple separate first sealing elements also allows simplified assembly. Furthermore, thereby, sealing of the at least one line with respect to the flow channel of the fuel cell stack is improved with respect to the prior art. Moreover, disassembly is simplified with respect to the prior art, since corresponding components of the fuel cell assembly can be pulled past each other in disassembly, i.e. for example perpendicularly to the longitudinal orientation of the fuel cell stack, whereas they would have to be pulled apart from each other with a radially pressed sealing element, for which corresponding installation space is required. Thereby, maintenance and exchange of components of the fuel cell assembly are simplified with respect to the prior art.
Preferably, the first sealing elements are each formed in a shape closed in circumferential direction, wherein the webs each radially protrude from the circumference. The web allows exact pressing of the first sealing elements since it constitutes a resistance such that the first sealing elements for example cannot be encompassed by an inner wall of the lines. Particularly preferably, therein, the first sealing elements connected to each other and the webs are formed integrally with each other, whereby manufacture of the connection of the first sealing elements can be simply and inexpensively realized.
Conveniently, the first sealing elements are each formed of an electrically insulating material. In particular a material absorbing electromagnetic waves is suitable to this, e.g. ethylene-propylene-diene rubber, hydrogenated acrylonitrile butadiene rubber or fluorocarbon rubber.
According to a further advantageous embodiment, the housing includes a housing lid disposed parallel to the at least one end plate in a longitudinal orientation of the fuel cell stack and including at least one recess for passing through at least one of the connections or at least one of the tubular lines.
Preferably, the housing lid is connected. to the other component of the housing by screwing. Thereby, tight arrangement of the fuel cell stack with respect to an external environment is ensured. The recess introduced into the housing lid allows connection between the end plate of the fuel cell stack and the media distributor plate such that media can be supplied to the fuel cell stack and can again be discharged from the fuel cell stack. Media to be supplied to the fuel cell stack are for example reactants, i.e. a fuel, for example hydrogen, and an oxidant, for example oxygen. A medium to be discharged from the fuel cell stack is for example a reaction product forming from the reactants, usually water. A medium, which is to be supplied to and also again to be discharged from the fuel cell stack, is for example a tempering medium for cooling and/or heating the fuel cell stack.
Preferably, the housing lid includes at least one second sealing element, which is disposed on an end side facing the end plate and encloses the at least one recess on the edge side. Thereby, the housing lid is sealed with respect to the end plate, wherein the at least one second sealing element is axially pressed against the end plate and against the housing lid.
Furthermore, the housing lid includes a third sealing element, which is disposed on an end side of the housing lid facing the housing and encloses an edge area of the end side at least in sections. Thereby, the housing lid is sealed to the housing, whereby an
electromagnetic compatibility of the fuel cell assembly is ensured since thus the fuel cell stack is shielded with respect to the external environment. A form-fit between the housing lid and the housing offers an alternative to this, which is realized by means of correspondingly formed undercuts. By introducing such undercuts, cost can be saved with respect to the use of the third sealing element.
For a mechanically stable attachment of the fuel cell stack with the housing, the housing has at least one fixing opening, into which a receiving plate with a feed-through opening for a fixing means is inserted. The at least one fixing opening and the feed-through opening are formed in the shape of an elongated hole in particular in order to allow length compensation for exact positioning and attachment of the fuel cell stack in the housing. Thereby, the fixing means, e.g. screws, are displaceable in the longitudinal orientation of the housing in the elongated holes, at least before completely screwing in tight.
In a further advantageous embodiment, the end plate includes further first sealing elements on an end side facing the fuel cell stack, which each are disposed between an abutment surface of an edge area of one of the connections and an abutment surface of an edge area of one of the flow channels. Thereby, the connections are additionally sealed with respect to the flow channels.
In the following, embodiments of the invention are explained in more detail based on drawings.
Therein show:
Fig. 1 schematically a partial exploded illustration of a fuel cell assembly with a media distributor unit in a perspective front view,
Fig. 2 schematically an enlarged section of the fuel cell assembly according to figure 1 with a front side of an end plate,
Fig. 3 schematically an enlarged section of the fuel cell assembly according to figure 1 with a rear side of the end plate,
Fig. 4 schematically a partial exploded illustration of the fuel cell assembly with the media distributor unit in perspective rear view, and Fig. 5 schematically a partial exploded illustration of a fuel cell assembly according to the prior art.
Parts corresponding to each other are provided with the same reference characters in all of the figures.
Figures 1 to 4 show a fuel cell assembly B according to the invention including a fuel cell stack 1 , a media distributor unit 2 and a housing 3 in various views.
Therein, figure 1 shows a partial exploded view of the fuel cell assembly B with the media distributor unit 2 in perspective front view. The figures 2 and 3 each show an enlarged section of the fuel cell assembly B according to figure 1 , wherein an end plate 1 .1 closing the fuel cell stack 1 on the end side is illustrated in more detail, and figure 2 shows a lower area of a front side and figure 3 shows a lower area of a rear side of the end plate 1 .1 . Figure 4 shows the fuel cell assembly B in partial exploded illustration with the media distributor unit 2 in perspective rear view.
The fuel cell assembly B according to the invention is in particular suitable and/or formed for integration in a fuel cell system for generating driving energy in a vehicle.
To this, the fuel cell stack 1 includes a plurality of fuel cells not illustrated in more detail, by means of which a chemical reaction energy is converted into electrical energy.
On each end side of the fuel cell stack 1 , a closing end plate 1 .1 is disposed, wherein one of the end plates 1 .1 is a cathode end plate and the other of the end plates 1.1 is an anode end plate. The end plate 1.1 shown in the present embodiment, facing the media distributor unit 2, is for example the cathode end plate.
The end plates 1.1 are for example each formed of a metallic material and constitute a flow-technical interface for supply and discharge of media for an operation of the fuel cell assembly B.
Media to be supplied to the fuel cell stack 1 are for example a first reactant and a second reactant, i.e. a fuel, for example hydrogen, and an oxidant, for example oxygen, wherein the oxygen for example is to be supplied to the fuel cell stack 1 in the form of air. A medium to be discharged from the fuel cell stack 1 is for example a reaction product forming from the reactants, usually water, i.e. the media distributor unit 2 preferably also contributes to the drainage of the fuel cell stack 1. Furthermore, a not consumed portion of the respective reactant can also be again to be discharged from the fuel cell stack 1.
Therein, in particular the not consumed portion of the hydrogen is conveniently to be supplied again to the fuel cell stack 1 via a return channel not illustrated in more detail such that this portion of the reactant hydrogen is then a medium to be discharged and again to be supplied. A medium, which is to be supplied to and also again to be
discharged from the fuel cell stack 2 is for example a tempering medium for cooling and/or heating the fuel cell stack 1 , for example cooling water or another cooling or tempering liquid.
In order to allow this, the end plate 1.1 facing the media distributor unit 2 has a number of connections 1.1.1 associated with a number of flow channels SK, wherein the flow channels SK each lead into the fuel cell stack 1 starting from the connections 1.1.1.
The connections 1.1.1 are each formed as a passage opening and constitute an input or output of the flow channels SK.
In the present embodiment, the end plate 1 .1 has each three connections 1 .1 .1 in a lower area and in an upper area, which collectively protrude axially from an end side of the end plate 1 .1 towards the media distributor unit 2 forming a collar. Alternatively, the edge areas of the connections 1.1.1 can also terminate with the surface of the end plate 1.1 on the edge side.
Therein, the connections 1.1.1 in the upper area constitute for example interfaces for supplying the tempering medium, the oxidant and the fuel to the fuel cell stack 1 . In contrast, the connections 1.1.1 in the lower area constitute interfaces for discharge of the tempering medium, the air with the not consumed portion of the oxygen and the not consumed portion of the hydrogen from the fuel cell stack 1.
The edge areas of the connections 1.1.1 facing the media distributor unit 2 are each enclosed by a first sealing element 4.1 , which has a shape closed in circumferential direction and corresponding to the edge area of the respective connection 1 .1.1 . As illustrated in more detail in figure 2, a first sealing element 4.1 is respectively connected to the adjacent disposed first sealing element 4.1 by means of a web 4.1.1 , wherein the webs 4.1.1 are preferably integrally formed with the first sealing elements 4.1. As shown in figure 3, the connections 1 .1.1 can additionally also have such first sealing elements 4.1 on the side facing the fuel cell stack 1 , which preferably are formed identically to the first sealing elements 4.1 on the opposing side of the end plate 1.1 . Thereby, the first sealing elements 4.1 can be manufactured in a common process for both end sides of the end plate 1.1.
An assembly of the first sealing elements 4.1 is particularly simplified by the connection by means of the webs 4.1.1 since the sealing elements 4.1 are positioned as one part over the connections 1.1.1. In addition, the webs 4.1.1 prevent radial pressing of the first sealing elements 4.1 in the assembly of the media distributor unit 2, which is elaborated in the following.
The first sealing elements 4.1 are preferably formed of an electrically insulating material, which absorbs electromagnetic waves, such as for example ethylene-propylene-diene rubber, hydrogenated acrylonitrile butadiene rubber or fluorocarbon rubber. Therein, the first sealing elements 4.1 in particular serve for sealing connection between the
connections 1.1.1 and tubular lines L, which serve for supplying the media to the flow channels SK and which are each passed through the media distributor unit 2 at least in sections. The tubular lines L are described in more detail in the following.
Therein, the first sealing elements 4.1 are each disposed between the edge area of the connection 1.1 .1 and an abutment surface of one of the tubular lines L and axially pressed against it in the assembled state of the fuel cell assembly B. I.e., an end face of the first sealing element 4.1 faces the edge area of the connection 1 .1.1 and the other end face faces the abutment surface of the tubular line L, wherein a pressing force acts
perpendicularly to the end faces of the first sealing element 4.1 and thereby axially on the first sealing element 4.1. Herein, an end face of the first sealing elements 4.1 is a side facing the media distributor unit 2 and the end plate 1.1.
Therein, the first sealing elements 4.1 disposed on the opposing end side of the end plate 1.1 are axially pressed with an abutment surface of the fuel cell stack 1 in the edge area of the flow channels SK. Thereby, the end plate 1.1 is also sealed against the fuel cell stack 1.
The webs 4.1.1 prevent enclosing the first sealing elements 4.1 by an inner wall of the tubular lines L since they form a resistance in pressing the media distributor unit 2 with the fuel cell stack 1 and the housing 3. Thereby, slight offsets in assembly of the media distributor unit 2 are also tolerated such that it is simpler to assemble with respect to seals to be radially pressed. By means of the sealing connection, in particular an electrical contact of voltage carrying parts of the fuel cell stack 1 with electrically conductive parts of the fuel cell assembly, e.g. components of the media distributor unit 2, is avoided. In addition, a compact connection between the media distributor unit 2 and the fuel cell stack 1 is ensured, wherein tolerances in the positioning of the tubular lines L to the connections 1.1.1 are given by means of the previously described first sealing elements 4.1 , which simplifies assembly of the fuel cell assembly B with respect to radially pressed seals. In addition, the connections 1.1.1 and the abutment surfaces of the tubular lines L are respectively sealed by means of a first sealing element 4.1.
The media distributor unit 2 is formed of two base plates 2.1 , 2.2 disposed on top of each other. The tubular lines L are each disposed between the two base plates 2.1 , 2.2 at least in sections. Therein, the tubular lines L are formed as insert parts, which are inserted in insertion formations 2.3 of the media distributor unit 2.
Thus, in the embodiment illustrated in the figures 1 and 4, only end sections of the tubular lines L protrude from the media distributor unit 2.
At least one of the two base plates 2.1 , 2.2 is formed of a metallic material at least in certain areas, preferably completely, for example of an aluminum or magnesium alloy, for example in a casting method. Preferably, both base plates 2.1 , 2.2 are thus formed.
Thereby, high stability of the media distributor unit 2 is achieved and in particular thereby a shielding of the fuel cell stack 1 to the outside is achieved and thus an electromagnetic compatibility of the fuel cell assembly B is ensured, i.e. electromagnetic interferences emanating from the fuel cell assembly B are avoided or at least reduced to an admissible and/or preset extent.
The media distributor unit 2 is connected to the fuel cell stack 1 via a form- and force-fit connection to the end plate 1.1. An attachment of the media distributor unit 2 to the end plate 1.1 is effected by screwing in the area of the connections 1.1.1 on the fuel cell stack 1 , wherein corresponding screw elements are passed through screw openings of the base plates 2.1 , 2.2 provided for this and are for example screwed in threads formed in the end plate 1.1 such that the base plates 2.1 , 2.2 are pressed against each other and against the fuel cell stack 1 by means of screw heads of the screw elements. Moreover, the media distributor unit 2 is connected, in particular screwed, to a housing lid 3.1 in form- and force-fit manner, in analogous manner to the end plate 1.1.
The housing lid 3.1 is disposed parallel to the end plate 1.1 in longitudinal orientation of the fuel cell stack 1 such that it is disposed between the end plate 1.1 and the media distributor unit 2.
In a lower area and an upper area, the housing lid 3.1 has a recess 3.1.1 , respectively, through which the connections 1.1.1 of the flow channels SK protrude if the connections 1.1.1 in the form of the collar axially protrude in the direction of the media distributor unit 2, as it is shown in the present embodiments. Alternatively, it is also possible that the tubular lines L protrude through the recesses 3.1.1 if the edge areas of the connections 1.1 .1 terminate with the end side of the end plate 1 .1 on the edge side.
The housing lid 3.1 each has a second sealing element 4.2 in an edge area of the recess 3.1.1 , in particular on an end side facing the end plate 1 .1 , which has a shape closed in the circumferential direction and thus completely encloses the recess 3.1 .1 in the present embodiment. The second sealing elements 4.2 seal the housing lid 3.1 with respect to the end plate 1.1 , wherein the second sealing elements 4.2 are each axially pressed against the housing lid 3.1 and against an edge area of the connections 1 .1.1 extending beyond the first sealing elements 4.1 , e.g. an edge area of the collar, i.e. the pressing force acts perpendicularly to the end faces of the second sealing elements 4.2, wherein an end face of the second sealing elements 4.2 herein corresponds to a side facing the housing lid 3.1 and the end plate 1.1 .
The second sealing elements 4.2 are formed of an electrically insulating material analogous to the first sealing elements 4.1 .
Furthermore, the housing lid 3.1 has a third sealing element 4.3, which encloses an edge area of the end side of the housing lid 3.1 facing the end plate 1 .1 in sections.
Alternatively, the third sealing element 4.3 can also completely enclose the previously mentioned edge area.
The third sealing element 4.3 seals the housing lid 3.1 with respect to the housing 3 such that a shielding of the fuel cell stack 1 to the outside is thereby achieved and
electromagnetic compatibility of the fuel cell assembly B together with the media distributor unit 2 sealed against the end plate 1.1 is ensured. Alternatively or additionally, the housing lid 3.1 and the housing 3 can also have corresponding undercuts, whereby the housing lid 3.1 can be disposed on the housing 3 in form-fit manner. Therein, the form-fit has a step in the cross-sectional profile such that exit of electromagnetic radiation can be prevented or at least reduced. The step-shaped form-fit between the housing lid 3.1 and the housing 3 therein offers a considerable cost reduction with respect to the arrangement of the third sealing element 4.3, the material procuring costs of which are comparatively high.
The housing lid 3.1 closes the housing 3 on the end side in the area of the end plate 1.1 , wherein the fuel cell stack 1 is disposed in the housing 3. Therein, the fuel cell stack 1 is clamped by means of clamping means, e.g. clamping bands.
For the protection of the fuel cell stack 2 in the housing 3 from mechanical influences from the outside, for example in a collision of a vehicle, in which the fuel cell assembly B is installed, with an obstacle, the housing 3 is conveniently sufficiently stably formed.
To this, the housing 3 is formed of metal or of a combination of metallic material and plastic and/or carbon fiber reinforced carbon (CFC).
For attaching the fuel cell stack 1 in the housing 3, the housing 3 has fixing openings 3.2, into which receiving plates 3.3 can be inserted. In this manner, the fuel cell stack 1 can be screwed to the housing 3 by means of fixing screws 3.4. Both the fixing openings 3.2 and the feed-through openings for the fixing screws 3.4 in the receiving plates 3.3 are formed in the shape of elongated holes to allow length compensation for exact positioning and attachment of the fuel cell stack 1 in the housing 3, such that the fixing screws 3.4 are displaceable in the elongated holes in longitudinal direction of the housing 3, at least before completely screwing in tight.
In order to sealingly close the housing 3, a not illustrated seal and an also not illustrated cover are respectively to be fitted on the receiving plates 3.3. By means of further fixing elements, after fixing the fuel cell stack 1 in the housing 3, the respective cover is to be sealingly attached to the housing 3 together with the respective seal and the respective receiving plate 3.3.
In figure 5, a fuel cell assembly B according to the prior art is shown, wherein the tubular lines L are illustrated without the media distributor unit 2. Therein, the connections 1.1.1 disposed on the end plate 1.1 have separate seals, the function of which corresponds to the function of the first sealing elements 4.1 , namely sealing the tubular lines L with respect to the connections 1.1.1. Therein, the seals are enclosed by the inner wall of the respective tubular line L such that the seals are radially pressed with the tubular lines L, i.e. the pressing force acts radially on the outer circumference of the seals.
Two of the connections 1.1.1 for example serving for supplying and discharging the oxidant to the fuel cell stack 1 or from the fuel cell stack 2 each have a seal, which are formed analogously to the second sealing elements 4.2 without webs 4.1.1 and are axially pressed with the connections 1.1 .1 and the tubular line L.
According to the shown prior art, the tubular lines L have to be exactly positioned to ensure a sufficiently high seal of the tubular lines L to the connections 1.1.1 .
List of reference characters
1 Fuel cell stack
1.1 end plate
1.1.1 connection
2 media distributor unit
2.1 , 2.2 base plate
2.3 insert formations
3 housing
3.1 housing lid
3.1.1 recess
3.2 fixing opening
3.3 receiving plate
3.4 fixing screw
4.1 first sealing element
4.1 .1 web
4.2 second sealing element
4.3 third sealing element
B fuel cell assembly
L tubular lines
SK flow channel

Claims

Claims
Fuel cell assembly (B), including the following components:
- a fuel cell stack (1 ),
- at least one end plate (1.1 ), which closes the fuel cell stack (1 ) on the end side, including a number of connections (1.1.1 ) for a corresponding number of flow channels (SK) disposed in the fuel cell stack (1 ),
- a housing (3), in which the fuel cell stack (1 ) is disposed,
- a media distributor unit
(2), through which a number of tubular lines (L) for media supply to the flow channels (SK) and/or for media discharge from the flow channels (SK) is disposed, and
- a number of sealing elements (4.1 to 4.3) for sealing the components to each other,
characterized in that at least two first sealing elements (4.1 ) are connected to each other by means of each one web (4.1.1 ), wherein
- each one of the first sealing elements (4.1 ) connected to each other is disposed between two abutment surfaces of a tubular line (L) opposing each other and a connection (1.1.1 ), and wherein
- each one end face of the first sealing elements (4.1 ) faces an abutment surface of a component and is axially pressed against it.
Fuel cell assembly (B) according to claim 1 ,
characterized in that the first sealing element (4.1 ) is formed in a shape closed in circumferential direction and the respective web (4.1.1 ) protrudes radially from the circumference of the first sealing element (4.1 ).
3. Fuel cell assembly (B) according to claim 1 or 2,
characterized in that the first sealing elements (4.1 ) and the webs (4.1 .1 ) are formed integrally with each other.
4. Fuel cell assembly (B) according to any one of the preceding claims,
characterized in that the first sealing elements (4.1 .1 ) are each formed of an electrically insulating material.
5. Fuel cell assembly (B) according to any one of the preceding claims,
characterized in that the housing (3) includes a housing lid (3.1 ), which is disposed parallel to the at least one end plate (1.1 ) in a longitudinal orientation of the fuel cell stack(1 ) and includes at least one recess (3.1.1 ) for passing through at least one of the connections (1.1.1 ) or at least one of the tubular lines (L).
6. Fuel cell assembly (B) according to any one of the preceding claims,
characterized in that the housing lid (3.1 ) includes at least one second sealing element (4.2), which is disposed on the end side facing the end plate (1.1 ) and encloses the at least one recess (3.1.1 ) on the edge side.
7. Fuel cell assembly (B) according to claim 6,
characterized in that the housing lid (3.1 ) includes a third sealing element (4.3), which is disposed on an end side of the housing lid (3.1 ) facing the housing (3) and encloses an edge area of the end side at least in sections.
8. Fuel cell assembly according to claim 6 or 7,
characterized in that the housing lid (3.1 ) and the housing (3) are connected to each other in form-fit manner by means of correspondingly formed undercuts.
9. Fuel cell assembly (B) according to any one of the preceding claims,
characterized in that the housing (3) has at least one fixing opening (3.2), in which a receiving plate (3.3) with a feed-through opening for a fixing screw (3.4) is inserted, wherein the at least one fixing opening (3.2) and the feed-through opening are formed in the shape of elongated holes. Fuel cell assembly (B) according to any one of the preceding claims,
characterized in that the end plate (1.1 ) includes further first sealing elements (4.1 ) on the end side facing the fuel cell stack (1 ), which each are disposed between an abutment surface of an edge area of one of the connections (1 .1.1 ) and an abutment surface of an edge area of one of the flow channels (SK).
PCT/EP2015/000648 2014-04-25 2015-03-26 Fuel cell assembly WO2015161913A1 (en)

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DE102014006027.6 2014-04-25

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Publication number Priority date Publication date Assignee Title
DE102021210639A1 (en) 2021-09-23 2023-03-23 Ekpo Fuel Cell Technologies Gmbh fuel cell device

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US20100143759A1 (en) * 2008-12-10 2010-06-10 Kauepert Andreas Modular fuel cell system
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JP2000164238A (en) * 1998-11-24 2000-06-16 Aisin Seiki Co Ltd Fuel cell
US6541148B1 (en) * 2000-10-31 2003-04-01 Plug Power Inc. Manifold system for a fuel cell stack
US20020187380A1 (en) * 2001-06-06 2002-12-12 Hideyuki Tanaka Fuel cell
US20100143759A1 (en) * 2008-12-10 2010-06-10 Kauepert Andreas Modular fuel cell system
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