WO2023217533A1 - Système de pile à combustible et son procédé de fonctionnement - Google Patents

Système de pile à combustible et son procédé de fonctionnement Download PDF

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Publication number
WO2023217533A1
WO2023217533A1 PCT/EP2023/060949 EP2023060949W WO2023217533A1 WO 2023217533 A1 WO2023217533 A1 WO 2023217533A1 EP 2023060949 W EP2023060949 W EP 2023060949W WO 2023217533 A1 WO2023217533 A1 WO 2023217533A1
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WIPO (PCT)
Prior art keywords
compressors
fuel cell
cell system
fuel cells
fuel
Prior art date
Application number
PCT/EP2023/060949
Other languages
German (de)
English (en)
Inventor
Janik RICKE
Original Assignee
Zf Cv Systems Global Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zf Cv Systems Global Gmbh filed Critical Zf Cv Systems Global Gmbh
Publication of WO2023217533A1 publication Critical patent/WO2023217533A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—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
    • 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
    • H01M8/04111—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants using a compressor turbine assembly
    • 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
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H01M8/04395—Pressure; Ambient pressure; Flow of cathode reactants at the inlet or inside the fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04746—Pressure; Flow
    • H01M8/04753—Pressure; Flow of fuel cell reactants
    • 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
    • H01M8/249—Grouping of fuel cells, e.g. stacking of fuel cells comprising two or more groupings of fuel cells, e.g. modular assemblies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
    • H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane

Definitions

  • Fuel cell system and method for its operation relates to a fuel cell system, in particular a fuel cell system for a commercial vehicle, with a number of fuel cells, a number of separate compressors which are connected to the number of fuel cells on the inlet side in a fluid-conducting manner for air supply, and a number of expanders which are connected to the fluid-conducting outlet side in a fluid-conducting manner are connected to the number of fuel cells, and which are mechanically decoupled from the compressors, for recovering electrical energy from an exhaust gas stream of the number of fuel cells.
  • Fuel cell systems of the aforementioned type are generally known.
  • the compressor is used to draw in, compress and supply air to the cathode side inlet of the fuel cell to carry out the fuel cell reaction.
  • the compressed mixture of substances passes through the stack or stacks of the fuel cell.
  • the mixture of substances remaining after the reaction exits from the outlet of the fuel cell as a gaseous fluid stream on the cathode side.
  • This fluid flow usually still has an excess pressure compared to the environment and is therefore used in most fuel cell systems to influence the reactant balance in the fuel cell as dynamic pressure and/or to drive the expander shaft of the expander.
  • the mixture of substances emerging on the outlet side can be expanded to ambient pressure, and the energy delivered to the expander shaft is usually converted into electrical energy when the expander is connected to a generator.
  • DE 102019207117 A1 also shows such a system. From DE 102015202088 A1 a fuel cell system is known in which two compressors supply air to a fuel cell on the cathode side. One of the compressors is designed to provide a base load and has an expander that is mechanically coupled to the compressor. Likewise, DE 102018214710 A1 shows the use of two compressors connected in parallel to supply a fuel cell. It has been shown that fuel cell systems of the type described above generally work satisfactorily. The mechanical separation of compressor and expander offers design and efficiency advantages over conventional, rigid connections between compressor and expander. However, there was further potential for improvement in terms of the overall efficiency of the fuel cell system.
  • the invention was based on the object of specifying a fuel cell system which, as far as possible, overcomes the disadvantages found in the prior art.
  • the invention was based on the object of specifying a fuel cell system which, taking into account the installation space limitations in the operating environment of the fuel cell system, ensures an improved possibility of arranging the components while at the same time ensuring operational efficiency.
  • the invention solves the underlying problem by proposing a fuel cell system according to claim 1.
  • the fuel cell system of the type described above has a number of compressors that is greater than the number of expanders.
  • the specification “number” includes both a singular number and a plurality of units.
  • the invention is based on the idea that expanders and compressors can each have their optimal operating point at significantly different speed levels.
  • mechanical separation of compressor and expander it has been found that a particularly advantageous system architecture can be provided if, in addition to the mechanical separation between compressor and expander, the forced numerical assignment between compressor and expander is also eliminated. It has proven to be extremely advantageous to provide a larger number of compressors in a fuel cell system, which can then each be dimensioned smaller, and which can be controlled individually and/or together depending on the load at high speed levels relative to the number of expanders the number of fuel cells to provide the required air supply, while the exhaust gas flow is absorbed by a smaller number of expanders and stored in the Ways to recover electrical energy.
  • the number of expanders can in turn be dimensioned to be larger than if one expander were always rigidly assigned to one compressor. This division enables significantly improved scalability of the fuel cell system architecture. Another advantage is that the number of expanders can be maintained independently of the number of compressors. Since in practice it can and will happen that an expander is more heavily contaminated with impurities due to the exhaust gas flow than the number of compressors, this burden can be taken into account by specifically adjusting only the number of expanders, and this can be reduced in comparison In addition to the number of compressors, the smaller the number of expanders, the maintenance costs. In a preferred development, an expander and several compressors are assigned to each fuel cell.
  • a plurality of compressors preferably the compressors assigned to the fuel cell, are arranged in parallel and/or in series with one another in fluid technology.
  • Several separate compressors can also be arranged in a combination of series and parallel connection. In such configurations, it is expedient to bring together the cathode-side air supply upstream of the fuel cell.
  • several fuel cells are assigned to (each) one expander.
  • the number of fuel cells can in principle be equal to the number of expanders. But it can also be higher than the number of expanders. In such an application, it is usually expedient to combine the exhaust gas flow on the outlet side, i.e. downstream, of the fuel cells, and upstream of the number of expanders.
  • a preferred one Embodiment further provides, for example, that several fuel cells are assigned to each expander, and each fuel cell is in turn assigned a compressor. If compressors are mentioned in connection with the invention, this includes both single-stage compressors and multi-stage compressors.
  • a multi-stage compressor is to be understood as a compressor within the scope of the invention.
  • the compressors of the fuel cell system are each designed as multi-stage compressors, preferably as two-stage radial compressors, in particular turbo compressors. Scroll compressors and axial compressors are further preferred.
  • the compressors of the fuel cell system are each designed as single-stage compressors.
  • the aforementioned compressor types can also be designed as single-stage compressors. According to the invention, provision can also be made to implement a mixed operation of single-stage compressors and multi-stage compressors in the fuel cell system.
  • the expander or one, several or all of the number of expanders, has a turbine with an inlet cross section and a variable turbine geometry that is designed to change the inlet cross section of the turbine.
  • it may be necessary to vary the operating points of the number of fuel cells depending on the load. Since the amount of air flow supplied on the cathode side also changes depending on the load, the total exhaust gas flow also varies Number of fuel cells.
  • variable turbine geometry makes it possible to operate the expander at an optimal operating point depending on the load as a function of the exhaust gas flow emitted by the fuel cell, or depending on one or more operating parameters listed below. This allows the efficiency of the expander to be increased.
  • the turbine geometry is preferably operatively connected to an actuator which is used to control the turbine geometry. Turbine geometries controlled in this way are generally known.
  • the actuator can be designed as a pneumatically, hydraulically or electrically controlled actuator.
  • the fuel cell system has a control device arrangement which is connected in a signal-conducting manner to the expander, or to one, several or all of the number of expanders, and is set up to control the inlet cross section of the expander depending on one or more operating parameters of the fuel cell system.
  • the control device arrangement can be constructed entirely from dedicated control devices, or it can be partially or completely integrated into other control devices already present in the vehicle system, either in terms of hardware or software as a corresponding functional module.
  • the control device arrangement can be partially or completely integrated into the fuel cell control, the compressor control, the expander control, or into the control of a DC/DC converter for the fuel cell system.
  • the DC/DC converter is set up to adapt the voltage generated by the fuel cell to a predetermined voltage for the on-board electrical system of the commercial vehicle.
  • the background is that the Fuel cell has ohmic properties, i.e. has the lowest voltage at full load.
  • a DC/DC converter is preferably connected between the vehicle electrical system and the fuel cell. It ensures that the load-dependent voltage of the fuel cell is always converted to the on-board network voltage.
  • Many components in a DC/DC converter and the power electronics of a compressor - such as an inverter - and/or an expander are the same. Therefore, physical integration can reduce component redundancies.
  • control device arrangement can also have a single control device for controlling the compressor and the expander.
  • control device arrangement can be designed as a dedicated control device in the manner described above, or can be implemented in hardware or software in one of the control devices from the commercial vehicle system, see the statements above.
  • the control device arrangement preferably has the fuel cell control and is set up to control the variable turbine geometry. If, for example, the fuel cell system has a plurality of fuel cells, for example two fuel cells, and is only operated in alternating mode, i.e. only one fuel cell is operated while the second fuel cell is inactive, the fuel cell system as a whole is in partial load operation, in the present example 50% of the nominal power.
  • control device arrangement is set up to control the turbine geometry or the expander or the number of expanders in such a way that the guide vanes of the variable turbine geometry are moved into a partial load position, whereby the position of the guide vanes changes and the angle of attack on the expander wheel of the expander is changed .
  • the expander is preferably controlled in multiple stages or continuously.
  • a minimum load position of the variable turbine geometry is selected so that the expander is operated with a high degree of efficiency when only a single compressor is operated (then preferably at its best efficiency).
  • control device arrangement is designed to preferably control a maximum load control of the variable turbine geometry in such a way that the expander also operates at a high level of efficiency when all compressors of the number of compressors are operated at their respective optimal efficiency.
  • the variable turbine geometry the working range of the expander can be adjusted so that the expander can ideally be operated with high efficiency both when operating all compressors from the number of compressors in the system and when operating only a selection, namely at least one compressor from the number of compressors in each case with optimal efficiency. This must be determined in preliminary tests depending on the dimensions of the expander and the compressor.
  • the operating parameters already mentioned above represent a simple way to control the expander depending on the load.
  • control device arrangement is accordingly set up to receive data representative of the operating parameters from the number of compressors and/or the number of fuel cells and for this purpose is connected in a signal-conducting manner to the compressors and/or fuel cells.
  • the operating parameter(s) are preferably selected from the following: total mass flow of the number of compressors, total performance of the number of compressors, total performance of the number of fuel cells, number of operated compressors, number of operated Fuel cells, or a combination of several or all of the above operating parameters.
  • the mass flow provided by the compressors can either be recorded using sensors or derived from other measured variables, for example from the speeds and pressure conditions in the fuel cell system.
  • the exhaust gas flow emitted by the number of fuel cells on the outlet side could also be measured and used as a control variable or operating parameter.
  • the total performance of the number of compressors can, for example, be determined by measurement from the power electronics of the compressors, just as the total performance of the number of fuel cells can be measured in a generally known manner or can be determined derived from other measured variables, as is generally known.
  • the expander can also be controlled purely based on the number of compressors operated and/or based on the number of fuel cells operated. The invention has been described above in a first aspect with reference to the fuel cell system.
  • the invention further relates to a method for operating a fuel cell system, in particular for operating a commercial vehicle, wherein the fuel cell system is designed in particular according to one of the preferred embodiments described above.
  • the invention solves the underlying problem described at the beginning by proposing a method with the following steps: Generate electrical energy by controlling a number of fuel cells, supplying the fuel cell with air by controlling a number of separate compressors, which are fluidly connected to the number of fuel cells on the inlet side, and recovering electrical energy from an exhaust gas stream of the fuel cell by controlling a number of expanders, which are fluidly connected to the outlet side Number of fuel cells are connected and which are mechanically decoupled from the compressors, the number of compressors being greater than the number of expanders.
  • the method according to the invention makes use of the same advantages as the fuel cell system according to the invention.
  • the preferred embodiments of the fuel cell system are at the same time preferred embodiments of the method and vice versa, which is why reference is also made to the above statements in order to avoid repetition.
  • this includes the step of controlling a subset of the number of fuel cells depending on a required total power of the number of fuel cells.
  • the method alternatively or additionally comprises the step of controlling a subset of the number of compressors depending on a required total mass flow for supplying air to the number of fuel cells and/or depending on a total output of the number of fuel cells.
  • the method comprises the steps of receiving data from the number of compressors and/or the number of fuel cells, which are representative of one or more operating parameters of the fuel cell system, and changing an inlet cross section of the number of expanders depending on one or more of the operating parameters.
  • the operating parameter(s) are preferably selected as described above with respect to the fuel cell system.
  • the invention relates to a control device arrangement for a fuel cell system, in particular for a fuel cell system according to one of the preferred embodiments described above. The invention solves the underlying problem in that the control device arrangement is set up to carry out the method according to one of the preferred embodiments described above.
  • the invention relates to a use of a fuel cell system, which is designed according to one of the preferred embodiments described above, for operating a commercial vehicle.
  • the invention further relates to a use of the fuel cell system according to one of the preferred embodiments described above as a stationary fuel cell system for power supply, in particular emergency power supply, or for feeding electrical power into a power grid.
  • the use of the fuel cell system for stationary tasks is economically promising due to its good scalability.
  • a relatively large number of simple, for example single-stage, compressors can be used to supply the fuel cell system with air, with the exhaust gas generated by the fuel cell system being fed as an exhaust gas stream to a small number, or even just one, large exhaust gas turbine as an expander .
  • Figures 1a, 1b show schematic representations of a fuel cell system according to a first architectural principle
  • Figures 2a, 2b show schematic representations of a fuel cell system according to a second preferred architectural principle
  • Figure 3 shows a schematic representation of a fuel cell system according to Figures 1a, 1b with further details.
  • Figure 1 shows a fuel cell system 1 according to a first architectural variant.
  • the fuel cell system 1 has a number m, in this case two, compressors 3.1, 3.2.
  • the compressors 3.1, 3.2 are connected to a fuel cell 5.1 in a fluid-conducting manner on the inlet side and are set up to supply the fuel cell 5.1 with air.
  • the fuel cell 5.1 is set up to generate electrical energy E FC at a power P FC .
  • the fuel cell system 1 is the fuel cell system of a commercial vehicle
  • the fuel cell 5.1 is expediently connected to an electrical storage unit (not shown) in order to make the power P FC available to the vehicle's on-board network via intermediate storage.
  • the fuel cell 5.1 is fluidly connected to a number n, in the present case a single expander 7.1, so n is equal to 1.
  • the number n expanders is therefore smaller than the number m compressors.
  • the expander 7.1 is set up to at least partially convert the exhaust gas of an exhaust gas stream A supplied by the fuel cell 5.1 into electrical recuperation energy E R at a recuperation power P R.
  • the recuperation power P R can, for example, be supplied to the number m of compressors, as indicated by the dashed lines, or also to the energy storage (not shown) to which the fuel cell system 1 is assigned.
  • Figure 1b shows a scaled variant of the fuel cell system 1 from Figure 1a.
  • the fuel cell system 1' shown in Figure 1b has a larger number m of compressors, namely the compressors 3.1, 3.2, 3.3 etc. up to 3.m.
  • the fuel cell 5.1 in turn generates electrical energy E FC at a power P FC and provides an exhaust gas flow A on the outlet side to a number of n ⁇ m expanders 7.1... 7.n.
  • the spatial arrangement of the compressors can be varied within wide limits depending on the situation, and the expander 7.1 or the number n expanders 7.1...7.n can be adapted to the size of the exhaust gas flow A completely independently of the arrangement of the compressors 3.1...3. m. be adjusted.
  • FIGS. 1a, 1b a fuel cell system 1'', 1''' is shown in which a number m of compressors 3.1...3.m is larger than the number n expanders 7.1... 7.n held in the fuel cell system 1'', 1'''.
  • each compressor 3.1...3.m is assigned a fuel cell 5.1...5.o, so m is equal to o, and the output from the fuel cells on the outlet side Exhaust gas streams A 1 ...
  • a o are combined to form a total exhaust gas stream AG and then fed to the number n of compressors 7.1...7.n.
  • the arrangement of the fuel cells 5.1...5.o and the compressors 3.1...3.m can be varied freely depending on the situation, and the dimensions of the expander can be optimally determined independently of the compressors and their arrangement.
  • the fuel cells 5.1...5.o each provide a power P FC1 ... P FC1 , which should be understood collectively as the total fuel cell power PG.
  • the number o of fuel cells can also be different from the number m of compressors and different from the number n of expanders.
  • Figure 3 a further preferred embodiment of the invention is shown in Figure 3, in which, as in the previous exemplary embodiments of Figures 1a to 2b, the specific number m the compressor 3.1...3.m, and number n of expanders 7.1...7.n as well as the Number o of fuel cells 5.1...5.o according to the invention can be different than specifically shown here.
  • m>n applies, and preferably m ⁇ o and o ⁇ n. It is considered particularly advantageous to select the number n of expanders to be less than or equal to the number o of fuel cells, because then no division of the exhaust gas flow has to be carried out after passing through the fuel cells.
  • the fuel cell system 1'''' also has a second compressor 3.2, which is set up to promote and compress a second air flow L 2 .
  • a number n of expanders are arranged downstream of the fuel cell 5.1, the expander 7.1 being set up to receive the exhaust gas stream A supplied from an outlet 21 of the fuel cell 5.1 via a corresponding line 23 and from this to receive electrical energy E R at a To recover recuperation power P R.
  • the compressors 3.1, 3.2 are each designed as two-stage compressors and have a first compressor stage 9 and a second compressor stage 11 connected in series. The two compressor stages 9, 11 are coupled to one another and are driven by an electric machine 13, which works as an electric motor. The air is passed from the first compressor stage 9 to the second compressor stage 11 by means of an intermediate line 15.
  • the expander 7.1 has a turbine 25, which has a variable turbine geometry 27.
  • the turbine geometry 27 is connected in a signal-conducting manner to an actuator 30, which can be designed, for example, as a hydraulic actuator or electric or pneumatic actuator or mixing actuator and is set up to move the turbine geometry 27, for example its guide blades (not shown).
  • an actuator 30 can be designed, for example, as a hydraulic actuator or electric or pneumatic actuator or mixing actuator and is set up to move the turbine geometry 27, for example its guide blades (not shown).
  • the turbine 25 of the expander 7.1 is operatively connected to an electrical machine 28, which works as a generator and is set up to provide electrical recuperation energy E R at a recuperation power P R , as has already been shown in principle in the previous figures 1a to 2b.
  • the fuel cell system 1'''' also has a control device arrangement 29, which has a data memory (not shown) and a processor (not shown) and is set up to control the actuator 30 based on one or more operating parameters B P.
  • the control device arrangement 29 is set up to control the inlet cross section Q E of the turbine 25 depending on one or more operating parameters B P of the fuel cell system 1''''. It can do this by controlling the actuator 30, which operates the variable turbine geometry 27.
  • the control device arrangement 29 is shown in FIG. 3 as a dedicated device. But it can also be integrated just as well into one of the other components shown, preferably into the fuel cell 5.1.
  • the control device arrangement 29 can be integrated into the fuel cell control of the fuel cell 5.1 in terms of hardware and/or software.
  • the control device arrangement 29 is programmed to carry out the method according to the invention.
  • electrical energy E FC is generated by controlling a number of fuel cells 5.1...5.o.
  • the number o fuel cells 5.1 ... 5.o is supplied with air L by controlling a number m of separate compressors 3.1, 3.2 ...
  • the control device arrangement 29 preferably receives from the compressors 3.1, 3.2. ... 3.n in particular from power electronics (not shown) of the compressor and/or the fuel cells 5.1. ...

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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)
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Abstract

L'invention concerne un système de pile à combustible (1, 1', 1'', 1''', 1''''), plus particulièrement pour un véhicule utilitaire, comportant un certain nombre (o) de piles à combustible (5.o), un certain nombre de compresseurs séparés (3.m) qui sont reliés par conduction de fluide du côté de l'entrée au nombre (o) de piles à combustible (5.o) afin de fournir de l'air, et un certain nombre de détendeurs (7.n) qui sont reliés, du côté de la sortie, au nombre (o) de piles à combustible (5.o) de manière fluidiquement conductrice et sont mécaniquement découplés des compresseurs (3.m) afin de récupérer l'énergie électrique (ER) d'un flux de gaz d'échappement (A) du nombre (o) de piles à combustible (5.o). Selon l'invention, le nombre de compresseurs (3.m) est supérieur au nombre (n) de détendeurs (7.n).
PCT/EP2023/060949 2022-05-13 2023-04-26 Système de pile à combustible et son procédé de fonctionnement WO2023217533A1 (fr)

Applications Claiming Priority (2)

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DE102022112099.6 2022-05-13
DE102022112099.6A DE102022112099A1 (de) 2022-05-13 2022-05-13 Brennstoffzellensystem und Verfahren zu dessen Betrieb

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DE102022119879A1 (de) 2022-08-08 2024-02-08 Zf Cv Systems Global Gmbh Brennstoffzellensystem und Fahrzeug, insbesondere Nutzfahrzeug
DE102022119876A1 (de) 2022-08-08 2024-02-08 Zf Cv Systems Global Gmbh Brennstoffzellensystem und Fahrzeug, insbesondere Nutzfahrzeug

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