A fuel-cell system, in particular for a vehicle, has a device for supplying the operating agents for a fuel cell and an electrical energy accumulator. The energy accumulator is composed of a battery and of an intermediate charge store which has a lower internal resistance than the battery. A switch
A fuel-cell system, in particular for a vehicle, has a device for supplying the operating agents for a fuel cell and an electrical energy accumulator. The energy accumulator is composed of a battery and of an intermediate charge store which has a lower internal resistance than the battery. A switch is provided in the electrical connection between the energy accumulator and the fuel cell.
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1. A fuel-cell system comprising:a fuel cell;a device for supplying operating agents of the fuel cell; andan electrical energy accumulator connected to the fuel cell via an electrical connection, the energy accumulator having a battery with a battery internal resistance and an intermediate charge st
1. A fuel-cell system comprising:a fuel cell;a device for supplying operating agents of the fuel cell; andan electrical energy accumulator connected to the fuel cell via an electrical connection, the energy accumulator having a battery with a battery internal resistance and an intermediate charge store having a charge store internal resistance, the charge store internal resistance having a lower resistance than the battery internal resistance; anda switch provided in the electrical connection between the energy accumulator and the fuel cell,wherein the intermediate charge store has a capacitor.2. The fuel-cell system as recited in claim 1, wherein the switch is an electrical switch made of semiconductor components.3. The fuel-cell system as recited in claim 1, wherein the fuel cell has a cathode region and an anode region, the device for supplying the operating agents including an air-supply system to supply the cathode region, and a gas-generating system to supply the anode region.4. The fuel-cell system as recited in claim 3, further comprising a storage device disposed between the anode region and the gas-generating system for intermediately storing unconsumed operating agents.5. The fuel-cell system as recited in claim 3 wherein, the anode region of the fuel cell includes a bypass line via which the operating agent is brought into circulation.6. The fuel-cell system as recited in claim 5, further comprising a jet pump capable of being driven by a volumetric flow of the operating agents delivered by the gas-generating system.7. A fuel-cell system comprising:a fuel cell;a device for supplying operating agents of the fuel cell; andan electrical energy accumulator connected to the fuel cell via an electrical connection, the energy accumulator having a battery with a battery internal resistance and an intermediate charge store having a charge store internal resistance, the charge store internal resistance having a lower resistance than the battery internal resistance; anda switch provided in the electrical connection between the energy accumulator and the fuel cell,wherein the intermediate charge store has a supercap capacitor.8. A fuel-cell system comprising:a fuel cell;a device for supplying operating agents of the fuel cell; andan electrical energy accumulator connected to the fuel cell via an electrical connection, the energy accumulator having a battery with a battery internal resistance and an intermediate charge store having a charge store internal resistance, the charge store internal resistance having a lower resistance than the battery internal resistance; anda switch provided in the electrical connection between the energy accumulator and the fuel cell,wherein the intermediate charge store has a coil.9. A method for operating a fuel-cell system having a fuel cell, a device for supplying operating agents of the fuel cell, an electrical energy accumulator connected to the fuel cell via an electrical connection, the energy accumulator having a battery with a battery internal resistance and an intermediate charge store having a charge store internal resistance, the charge store internal resistance having a lower resistance than the battery internal resistance, and a switch provided in the electrical connection between the energy accumulator and the fuel cell, comprising the step of:regulating a system voltage of the fuel cell system in response to an opening or closing of the switch to charge the energy accumulator so as to maintain the system voltage within a predefined voltage range;wherein the battery is charged during the time periods in which the switch is open using the intermediate charge store.10. The method as recited in claim 9, wherein, in response to a predefined minimal system voltage being undershot, the switch is closed, and, in response to a predefined maximum system voltage being exceeded, the switch is opened.11. The method as recited in claim 10, wherein the predefined minimal and maximum system voltages are varied as a function of a charge state of the battery.12. The method as recited in claim 9, wherein the connection between the fuel cell and the energy accumulator is switched in pulse-width modulated fashion, the pulse width being controlled as a function of the active system voltage.13. The method as recited in claim 12, wherein, in response to a rising system voltage, the pulse width of the phases in which the fuel cell is connected to the system, is shortened.14. The method as recited in claim 9, wherein the switching cycles of the switch are used as a controlled or regulated variable for activating or regulating the devices for supplying the operating agents.15. The method as recited in claim 9, wherein a quantity of operating agents delivered by the devices for supplying the operating agents is controlled as a function of at least one of a load state of the fuel cell and of a load and charge state of the energy accumulator.16. The method as recited in claim 15, wherein, in response to a dropping charge state of the battery or in response to a rising load state in the fuel-cell system, the quantity of operating agents delivered by the device for supplying the operating agents, is increased.17. The method as recited in claim 9, wherein an average charging current that the fuel cell uses to charge the battery is varied as a function of the quantity of operating agents available on an anode side of the fuel cell.18. The method as recited in claim 17, wherein, in response to a dropping quantity of operating agents on the anode side of the fuel cell, the average charging current is reduced.19. The method as recited in claim 9, wherein, in response to a predefined minimal charging current of the battery being undershot, the fuel cell and the devices for supplying the operating agents are switched off.20. A motor vehicle comprising a fuel-cell system as recited in claim 1.
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이 특허에 인용된 특허 (5)
Schmidt Heribert,DEX, Apparatus for charge exchange among a plurality of series connected energy accumulators or energy converters.
Werth John (Princeton NJ) Fekete ; deceased Imre (late of Piscataway NJ by Anna M. Fekete ; administratrix), Fuel cell/battery hybrid system having battery charge-level control.
Goetz, Georg; Burckhardt, Sylvester; Bauer, Michael; Buchner, Andreas; Pfattrisch, Florian, Operating method for an electric energy system of a motor vehicle comprising a fuel cell system, an accumulator and an electric motor.
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