EP1412997A2 - Dispositif et procede d'humidification de cellules de combustible utilisant une membrane polymere comme electrolyte - Google Patents

Dispositif et procede d'humidification de cellules de combustible utilisant une membrane polymere comme electrolyte

Info

Publication number
EP1412997A2
EP1412997A2 EP01960567A EP01960567A EP1412997A2 EP 1412997 A2 EP1412997 A2 EP 1412997A2 EP 01960567 A EP01960567 A EP 01960567A EP 01960567 A EP01960567 A EP 01960567A EP 1412997 A2 EP1412997 A2 EP 1412997A2
Authority
EP
European Patent Office
Prior art keywords
dampening water
reactant
supply
fuel cell
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01960567A
Other languages
German (de)
English (en)
Inventor
Andreas Schiegl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Truma Geraetetechnik GmbH and Co KG
Original Assignee
Truma Geraetetechnik GmbH and Co KG
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 Truma Geraetetechnik GmbH and Co KG filed Critical Truma Geraetetechnik GmbH and Co KG
Publication of EP1412997A2 publication Critical patent/EP1412997A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—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
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04126—Humidifying
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the invention relates to fuel cell stacks with a plurality of polymer electrolyte membrane individual fuel cells and with feeds for reactants and dampening water, each individual fuel cell having an anode, a cathode, an intermediate polymer electrolyte membrane and an anode-side and / or cathode-side reaction medium distribution space, and a method for moistening such fuel cell stacks.
  • the fuel cells preferably use hydrogen or a methanol / water mixture in gaseous form as the fuel gas and air or as the oxidizing agent
  • Polymer electrolyte membranes tend to dry out during the operation of the fuel cells, which initially leads to an increase in their internal electrical resistance and a decrease in the performance of the
  • the maintenance and regulation of a water balance adapted to the respective operating conditions of the fuel cells is therefore one of the decisive operating criteria for polymer electrolyte membrane fuel cells.
  • Another object of the present invention is to provide a device and a method for moistening polymer electrolyte membrane.
  • Another object of the present invention is to provide a device and a method for moistening polymer electrolyte membrane fuel cells in which areas with water
  • the object is achieved by a fuel cell stack with a plurality of polymer electrolyte membrane individual fuel cells and with
  • Feeds for reactants and dampening water each individual fuel cell having an anode, a cathode, a polymer electrolyte membrane arranged therebetween and an anode-side and / or cathode-side reaction agent distribution space, characterized in that at least one dampening water feed is arranged to pass through the fuel cell stack and a plurality are arranged along its length has first openings, at least one reactant supply is arranged to pass through the fuel cell stack and has a plurality of second openings or interruptions along its length, wherein - the at least one dampening water supply is connected to the at least one reactant supply via the plurality of first openings, and wherein the at least one reactant supply via the plurality second openings or interruptions with the anode-side or cathode-side reactant distribution spaces of the individual fuel cells in connection.
  • the object is also achieved by the fuel cell humidification system, which has the aforementioned fuel cell stack, a humidification water reservoir, a humidification water pump and possibly a device for the pulsed supply of humidification water and a device for humidification water return.
  • the object is also achieved by a method for humidifying at least one reactant in a fuel cell stack with a plurality of polymer electrolyte membrane individual fuel cells and with feeds for reactant and dampening water, each individual fuel cell having an anode, a cathode, a polymer electrolyte membrane arranged in between, and an array-side and / - or has a reagent distribution space on the cathode side, characterized in that at least one dampening water supply is provided with a plurality of first openings via which the dampening water supply is connected to a reactant supply, a plurality of second openings or interruptions are provided in the reactant supply connected to the humidifying water guide, via which the reactant supply communicates with the anode-side or cathode-side reaction medium distribution spaces of the individual fuel cells, and dampening water is fed into the dampening water supply in liquid form, enters via the first openings into the reactant supply, is received by the reactant flowing in the reactant supply, and is
  • the device and method according to the present invention can be used in fuel cell stacks with two or more fuel cells and also in individual fuel cells.
  • dampening water is fed in in liquid form via a dampening water supply which preferably supplies all individual fuel cells of the stack with dampening water.
  • a dampening water supply which preferably supplies all individual fuel cells of the stack with dampening water.
  • a plurality of dampening water feeds can also be provided, which jointly supply the individual fuel cells of a stack with dampening water or can be responsible for different individual fuel cells in a stack.
  • certain individual fuel cells can be divided by several Humidification water supply, others, however, are only humidified by a humidification water supply. The invention is described below with the aid of a dampening water supply which supplies all individual fuel cells of a stack with dampening water centrally.
  • the dampening water supply leads liquid water directly into the fuel cell stack. It is connected to the fuel gas supply or the oxidant supply in such a way that the gas stream entering the stack entrains the dampening water emerging from the openings of the dampening water supply on its way into the individual fuel cells and distributes it finely and evenly in the anode-side or cathode-side reaction medium distribution space.
  • the entrainment of the dampening water through the reactant flow and metering into the individual fuel cells in the required amount is ensured by the inventive formation of the dampening water supply and the reactant supply (fuel gas and / or oxidizing agent).
  • the dampening water supply duct distributed over its length, has a plurality of first openings through which a reactant flows.
  • the dampening water supply is arranged either inside the reactant supply or directly adjacent to the reactant supply.
  • a connection of the dampening water supply and the reactant supply via connecting pieces which enable water to pass through is also possible in principle, but is less preferred because of the construction effort.
  • Water is in the dampening water supply at a pressure which is slightly, ie preferably about 10 to 50 kPa, above the gas pressure on the anode or cathode side, so that the water can escape from the openings of the supply line.
  • the cells are preferably operated at a pressure from atmospheric pressure to approximately 400 kPa, particularly preferably to approximately 200 kPa.
  • the first openings of the moistening water supply are preferably selected so that the water emerges in the form of drops, the size of the openings being far more important than the shape of the openings. Round openings are generally chosen, in particular because of the simplicity of manufacture.
  • the diameter of these water outlet openings is preferably 0.1 to 1.0 mm, particularly preferably 0.3 to 0.5 mm.
  • the humidification water is fed in continuously or, preferably, in pulses, i.e. only during the pulsation is the pressure in the
  • Humidification water supply high enough that water can escape from the first openings. In the case of pressure peaks, the pressure of 50 kPa given above can easily be exceeded.
  • the pulse rate and pulse duration depend on the water requirement, ie on the operating state of the system, its dimensions and the design of the dampening water supply. A pulse rate of 1 pulse per 1 to 120 seconds and a pulse duration of 0.5 to 10 seconds are preferred. In particular, the infeed of the humidification water in pulses makes it possible to adapt the metered amount of humidification water exactly to the humidification water requirement. A pulse rate of 1 pulse per 10 to 40 seconds and a pulse duration of 0.8 to 2 seconds are particularly preferred.
  • the dampening water is fed in by the pressure or, preferably, by a temporary pressure increase (pulses) in the dampening water supply. Aids that promote or cause the discharge of dampening water, for example piezo actuators or other means for generating sound waves or other waves, or a special nozzle-like configuration of the openings of the dampening water supply are not required. Only some type of dampening water delivery device, such as a pump, is therefore mandatory. In the case of pulsed feeding, a control valve is preferably also present.
  • the dampening water supply is preferably arranged either within a reactant supply or directly on a reactant supply.
  • the shape and cross-sectional area of the dampening water supply and the reactant supply are fundamentally arbitrary, as long as it is ensured that sufficient amounts of water and reactant can be supplied. Round and oval shapes are preferred.
  • the dampening water supply is arranged in or on the reactant supply in such a way that there are distances between the first openings and the second openings, which ensure that when the fuel cells are in operation, the dampening water emerging from the first openings is partly in the flow direction from the reactant flowing in the reactant supply is taken away.
  • the water emerging from the first openings is thus taken up by the flowing reactant and partly together with the reactant directly into the respective anode-side or cathode associated with the first openings.
  • This type of dampening water distribution is typically ensured when a substantial part, for example at least 30%, preferably at least 50%, of the reactant flows in the space between the first and the second openings, the form of the reactant supply also playing a role.
  • the dampening water supply is particularly preferably arranged in or on one or the realdione agent supply (s) in such a way that the largest
  • Part of the volume of the reactant can be used for introducing the dampening water into the individual fuel cells.
  • the dampening water supply is located within one (or the) reactant supply (s), it should therefore preferably not be arranged closer to the inlet openings of the reactant distribution spaces than is the case with an approximately coaxial arrangement, at least not over a longer area.
  • An arrangement in the upper half of the reactant supply (s) is particularly advantageous, and very particularly preferably an arrangement on or near the upper edge of the reactant supply (s). In this way, the humidification water supply is flowed around completely or at least for the most part by the reactant, but the largest part of the reactant flows below the humidification water supply.
  • the dampening water supply is also preferably arranged above the reactant supply. This ensures that for the entrainment, fragmentation, possibly atomization, and distribution of the water droplets emerging from the openings of the dampening water supply, all or at least the largest part of the reactant flow is available and, in addition, gravity can also be used for supply into each area of the reactant distribution rooms of each individual fuel cell. Depending on the temperature of the cells, a certain part of the dampening water changes to the vapor state after it has left the dampening water supply.
  • the first openings in the dampening water supply i.e. to provide the outlet openings of the dampening water for each individual fuel cell in the region of the entry into the reactant distribution space of the reactant transporting the dampening water.
  • One or more water outlet openings can be provided for each individual fuel cell. As a rule, one water outlet opening per single fuel cell is completely sufficient.
  • Several water outlet openings per individual fuel cell have the consequence that, with the same amount of water, the openings can be smaller, the emerging water drops are therefore also smaller and, under certain circumstances, can be more finely distributed and even atomized.
  • the dampening water supply can be straight or curved and can be arranged parallel or obliquely in the reactant supply. In this way, there are different distances between the first and second openings and, as a result, different amounts of the first openings directly into the assigned reactant distribution rooms humidification water. Basically, the following applies: the smaller the water drops emerging from the first openings, the greater the distance between the first and second openings and the faster the reactant flow rate, the greater the
  • the feed for the reactant can be designed in different ways.
  • the reactant supply can be constructed from individual sections, each of which opens into the reactant supply space for the reactant in question for each individual fuel cell, and can be passed through the remaining area of each individual fuel cell, against the
  • the reactant supply, into which the dampening water is introduced can be designed as a line which runs through the entire fuel cell stack and which has second openings in the region of the reactant distribution spaces of the individual fuel cells, ie openings for the outlet of reactant and dampening water.
  • These openings are preferably as large as possible in order to ensure an adequate dosage of reactant and dampening water.
  • the first openings in the dampening water supply are essentially in the region of the second openings of the reactant supply.
  • Fuel cell stack enriched with the finest droplets of dampening water.
  • part of a drop of water emerging from the dampening water supply is thus precisely introduced into the reagent distribution space to be humidified, while part of the water drop is transported downstream with the reagent, the reagent is increasingly loaded with water and thus for a stronger moistening due to diffuse in the reagent distributed water of the individual fuel cells further downstream.
  • This greater humidification of individual fuel cells located further downstream is an additional advantage of the present invention, which is particularly useful for stacks with a larger number of individual fuel cells, but can also be useful for stacks with only a few individual fuel cells.
  • the dampening water supply can also be arranged further away from the inlet openings into the reactant distribution spaces in the end region, so that less water is fed directly into them, but more water is diffusely distributed in the reactant and also leaves the stack with the reactant flow emerging from the stack.
  • the dampening water requirement in each area of the fuel cell stack can be optimally adapted to the requirements.
  • additional openings between the individual fuel cells can be provided in the dampening water supply. can be seen, or the dampening water supply can already contain openings before entering the stack, or water outlet openings can be completely absent in the downstream end region of the stack.
  • Arrangement in the fuel cell stack to optimally satisfy the different humidification water requirements of the individual fuel cells consists in supplying the reactant transporting the humidification water to the fuel cell stack from both sides.
  • the water droplets emerging from the humidification water supply are then increasingly fed by the flowing reactant from both ends of the stack to the middle, hotter region of the stack, while only a little less humidification water is available at both end regions of the stack.
  • each individual cell in the fuel cell stack is precisely metered in the required amount of dampening water and the reaction gas stream ensures the uniform water distribution in the individual cells.
  • the humidification water supply can be operated with continuous flow or in "dead-end operation". With continuous Flow it makes sense to return the unused dampening water.
  • the lines for the reactants and humidification water are preferably brought together in the end plates of the stack, but can also be carried out beforehand without further ado.
  • the combined reactant / dampening water supply line is then preferably guided through the stack in such a way that gravity can be used to distribute the dampening water in addition to the kinetics of the volume of reactant. It is therefore preferred to carry it out in the upper edge area or in an upper corner area of the fuel cell stack, with a diagonal flow of the reactant and dampening water through the individual fuel cells.
  • the combined reactant / dampening water supply can also be integrated into the sealing edge, so that no active reaction area is lost.
  • the humidification water supply according to the invention is fundamentally suitable for every type of fuel cell. A particularly good distribution of the
  • Humidification water and thus a particularly homogeneous humidification, is achieved if a flow channel structure is present in the reagent distribution space.
  • This flow channel structure can be provided separately or can be part of the electrode or the bipolar plate delimiting the cell or other delimitation.
  • the control of the dampening water metering is based on the operating parameters of the fuel cell system.
  • the need for humidification water is determined, for example by measuring the interior Resistance of the polymer electrolyte membranes, but preferably by monitoring the temperature and / or performance of the fuel cell stack. Monitoring of the voltage level is also possible. For the measurement of temperature, power, voltage or even the internal resistance, selected reference single cells or the whole can be used
  • Stacks can be used. According to the determined need, dampening water is fed from a storage container to the fuel cell stack via a pump, preferably a membrane pump, and a valve, preferably a solenoid valve.
  • a pump preferably a membrane pump
  • a valve preferably a solenoid valve.
  • a coupled mode of operation of the pump and the solenoid valve is advantageous to the preferred pulse-like
  • the excess dampening water emerging from the fuel cell stack via the reactant discharge line can be fed back to the storage container together with the water of reaction formed via a water separator, as a result of which the water consumption can be minimized.
  • the simple construction of the apparatus makes it possible to react to changes in the stack temperature, the stack output or the stack tension in a matter of seconds and to adapt the dampening water metering exactly to the requirement profile. Alternatively, for one
  • Characteristic fuel cell stacks are created, which then make it possible to adapt the water metering to the requirement profile with an exact knowledge of the fuel cell behavior. If, for example, a system runs through a known power cycle, the dampening water supply can be regulated in good time in anticipation of each operating state to be expected. In this way, the amount of dampening water is not adapted to every operating state with a slight delay, but when a the right amount of humidifying water is always available.
  • the humidification water reservoir and the feed line are filled with humidification water, so that the humidification system according to the invention with little effort, for. B. for heating and insulation, frost-proof.
  • the humidification water supply within the fuel cell stack is intrinsically safe against freezing, since the water has sufficient expansion options due to the existing water outlet openings.
  • the dampening water supply preferably consists of electrically non-conductive material, e.g. made of PTFE.
  • Additives that are required, for example sulfonic acid groups dissolved in water, can be added to the dampening water in order to increase the long-term stability of the polymer electrolyte membranes.
  • the invention is described in more detail below with the aid of preferred embodiments.
  • the humidification water supply is shown in combination with the fuel gas supply. However, the combination with the oxidant supply or the introduction of dampening water into both reactant streams is equally possible.
  • Fig. 1 shows an embodiment of a single fuel cell
  • Stack with dampening water supply according to the invention 2 shows a partial area of a fuel cell stack with dampening water supply according to the invention
  • FIG. 3 shows a section through the arrangement of FIG. 2 in the plane of a reagent distribution space of a single fuel cell
  • Fig. 6 is a schematic representation of the basic structure of the dampening water supply system according to the invention.
  • the line 1 shows a single fuel cell 2 with a dampening water supply according to the invention.
  • the line 12 for the dampening water supply is arranged inside and on the upper edge of the line 10 for the fuel gas supply.
  • the line 10 for the fuel gas supply (with line 12 in it for supplying dampening water) is in turn arranged at the upper edge of the individual fuel cell 2, so that in addition to the kinetics of the gas flow, gravity can also be used to distribute the dampening water.
  • the single fuel cell shown consists of anode 3 (with catalyst), cathode 5 (with catalyst) and polymer electrolyte membrane 7 arranged between them. On the surfaces of the anode 3 and cathode 5 facing away from the polymer electrolyte membrane there are an anode-side reactant distribution space 4 and a cathode-side reactant distribution space 6
  • the reagent distribution space 4 has a width 19, and the line 10 for the supply of bromide gas has an opening 17 in this area, so that fuel gas can enter the fuel gas distribution space unhindered.
  • the line 12 for the humidification water supply has an opening 15 in the area of the opening 17 of the bremgas supply line, through which humidification water enters the fuel gas line 10 in droplet form, is captured by the fuel gas, divided and taken along on the way to the fuel gas distribution space 4, where it comes together is evenly distributed with the fuel gas and via the anode
  • the fuel gas supply 10 is not a continuous line, but consists of sections that pass through the areas of the individual cells. go through, into which no fuel gas may enter, but leave the area of the fuel gas distribution spaces 4 free, ie have interruptions 18 there. If seals are provided between the individual cells, they can be shaped so that they are part of the line 10.
  • Fig. 3 shows a section through the arrangement of Fig. 2 in the plane A-A ', i. that is, a section through a fuel gas distribution space 4.
  • the embodiment shown here contains a flow channel structure 8 for better distribution of humidification water and fuel gas in the fuel gas distribution space 4.
  • the line 10 for the fuel gas supply has an oval shape, and a round line 12 running inside it arranged for humidification water supply.
  • the line 12 has openings 15 in the lower region through which dampening water enters the flow channel structure 8.
  • FIG. 4a shows an embodiment according to the invention of a combined dampening water / reactant supply.
  • the round line 12 for supplying dampening water is arranged inside and in the upper region of the oval line 10 for supplying the reactant.
  • the lines 10 and 12 each have the same spacing on their undersides, and are arranged substantially congruently, first openings 15 and second openings 17 for the escape of water or water / - reactant. The distances between the openings 15 and the
  • 4b shows another embodiment of a dampening water / reactant supply according to the invention.
  • the line 12 for the supply of dampening water is not arranged inside but directly above the line 10 for supplying the reactant.
  • the two are
  • Lines 10 and 12 are connected via the openings 15, which are passages here.
  • FIG 5a shows a downstream end region of a combined dampening water / reaction mixture feed according to the invention of a fuel cell stack.
  • the openings 17 in the reactant supply are shown relatively small here and in the other embodiments shown. Wider openings 17 allow the humidification water to be introduced more reliably into the reaction medium distribution spaces, since the system becomes less sensitive to drifting of the water drops emerging from the openings 15 due to the gas flow G as the width of the openings 17 increases. Inaccurate matching of openings 15 and openings 17 is then less important.
  • the openings 17 can extend in the flow direction at most over the width 19 of the reaction medium distribution spaces 4.
  • the openings 17 can extend perpendicular to the direction of flow at most over the entire circumference of the reactant supply 10. In this limit case, the openings 17 go into the interruptions 18 over, ie the reactant supply consists of individual sections.
  • the stack end plate 14 located downstream is located immediately adjacent
  • the reactant has taken up sufficient dampening water on its way through the stack to supply the last two cells of the stack with dampening water.
  • the distance between openings 15 and associated openings 17 can also be increased.
  • FIG. 5b shows an upstream end region of a combined dampening water / reactant supply line according to the invention of a fuel cell stack.
  • the dampening water supply duct 12 was brought together on the upstream stack end plate 13 before it entered the fuel cell stack.
  • the dampening water duct 12 already has water outlet openings 15 shortly before it enters the fuel cell stack. As a result, the reactant takes immediately before its
  • dampening water fuel cell stack Entry into the dampening water fuel cell stack.
  • This embodiment is particularly useful in the case of very fast reactant flows G when there is a risk that the cells 2 in the initial region of the stack will not be adequately supplied with dampening water, since the rapid reactant flow will cause a considerable part of each drop of water emerging from an opening 15 before it enters the associated reagent distribution space with it.
  • the dampening water supply can also be attached closer to the openings 17 in the initial area than in further downstream areas of the stack, so that a larger part of the water drops emerging from the openings 15 enters the assigned openings 17 directly.
  • the dampening water supply duct 12 in the area of the single fuel cells 2 with increased moisture requirement can have several openings 15 per opening
  • the dampening water supply can be attached closer to the openings 17 than in other areas of the stack.
  • 5d also shows a region of a combined dampening water / reactant agent according to the invention which is located in the center of the stacker.
  • additional water outlet openings are provided in the dampening water supply duct 12 in the area of the fuel cells with increased dampening water requirements.
  • the additional water outlet openings here are not exactly assigned to a specific individual fuel cell. Rather, additional water outlet openings 16 distributed between the water outlet openings 15 are provided in the central region of the dampening water supply duct 12. The water emerging from the openings 16 becomes taken up by the reactant flow G and diffusely distributed to the subsequent individual fuel cells.
  • FIG. 5e shows a combined dampening water / reactant supply line according to the invention, as shown in principle in FIG. 4a.
  • FIG. 6 shows a fuel cell system according to the invention with preferred peripherals.
  • a combined moistening water 12 / reactant 10 supply leads into the fuel cell stack 1.
  • the humidification water is fed into the fuel cell stack 1 from a reservoir 25 via a membrane pump 26 and a solenoid valve 27. Pump 26 and solenoid valve 27 operate coupled to achieve the preferred pulsed metering range.
  • the excess dampening water emerging from the stack 1 via the reaction gas discharge line is returned to the reservoir 25 together with the water of reaction formed via a return line 28 with a water separator 29.
  • the dampening water supply line can not only take place on the fuel gas side, as shown, but also on the oxidant side or on both sides.
  • the type of fuel cell humidification according to the invention has a number of advantages over conventional systems:
  • the system has a low consumption of dampening water and the dampening water does not require any preconditioning. On the one hand, this simplifies the structure of the system, and on the other hand it keeps it
  • the system can basically be operated at any temperature at which the dampening water is in the liquid state. As a rule, the dampening water can therefore simply be fed in at the respective ambient temperature. If temperatures are unsuitable, the system is easy to isolate, heat or cool due to its compactness.
  • the individual amount of humidification water required is metered into each individual cell only in a stack. Even with large temperature differences in the stack, there are no areas with undersupply or oversupply of dampening water.
  • the regulation of the dampening water metering according to the operating parameters of the fuel cell stack is simple, precise and extremely dynamic. It can be adapted to changing operating conditions in a matter of seconds. Forward-looking operation is also possible.
  • the humidification water supply can also be used to supply any auxiliary materials required.

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

Abstract

L'invention concerne l'humidification de piles de cellules de combustible utilisant une membrane comme électrolyte. Cette pile de cellules de combustible présente au moins une conduite d'amenée d'eau d'humidification (12) pourvue d'une première série de trous (15) par lesquels la conduite d'amenée d'eau d'humidification (12) est raccordée à une conduite d'amenée en agent réactif (10, 11). La conduite d'amenée en agent réactif (10, 11) qui est raccordée à la conduite d'amenée en eau d'humidification (12), présente une deuxième série de trous (17) par lesquels la conduite en agent réactif est raccordée aux compartiments de distribution d'agent réactif (4, 6) des différentes cellules de combustible (2). L'eau d'humidification entre dans la conduite d'amenée en agent réactif (10, 11) par la première série de trous (15) et est cédée par l'agent réactif dans les compartiments correspondants de distribution d'agent réactif.
EP01960567A 2000-07-28 2001-07-26 Dispositif et procede d'humidification de cellules de combustible utilisant une membrane polymere comme electrolyte Withdrawn EP1412997A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10036916A DE10036916B4 (de) 2000-07-28 2000-07-28 Brennstoffzellenstapel und Verfahren zur Befeuchtung eines Reaktionsmittels bei einem Brennstoffzellenstapel
DE10036916 2000-07-28
PCT/EP2001/008672 WO2002011221A2 (fr) 2000-07-28 2001-07-26 Dispositif et procede d'humidification de cellules de combustible utilisant une membrane polymere comme electrolyte

Publications (1)

Publication Number Publication Date
EP1412997A2 true EP1412997A2 (fr) 2004-04-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01960567A Withdrawn EP1412997A2 (fr) 2000-07-28 2001-07-26 Dispositif et procede d'humidification de cellules de combustible utilisant une membrane polymere comme electrolyte

Country Status (4)

Country Link
EP (1) EP1412997A2 (fr)
AU (1) AU2001282032A1 (fr)
DE (1) DE10036916B4 (fr)
WO (1) WO2002011221A2 (fr)

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DE10209808B4 (de) * 2002-03-06 2005-11-24 General Motors Corporotion, Detroit Wasservernebelungseinrichtung für ein Brennstoffzellensystem sowie Verfahren zur Befeuchtung eines einem Brennstoffzellensystem zugeführten Gasstromes
US7226680B2 (en) * 2003-02-07 2007-06-05 General Motors Corporation Integrated air cooler, filter, and humidification unit for a fuel cell stack
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DE10036916A1 (de) 2002-02-14
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WO2002011221A2 (fr) 2002-02-07

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