Robert Boschgmbh

Nikola Corporation

Sma Solar Technology Ag

Werner Belschner

Kevin M Lynk

Jesse Michael Schneider

Jorg Heyse

Markus Remlinger

Helerson Kemmer

Arpad Imre

Harald Schmeisser

Thomas Sauer

Jörg Heyse

Rene Pohlemann

Peter Eckert

The invention relates to a cooling system () for fuel cell stacks (), comprising a first cooling module () and a second cooling module (). The first cooling module () comprises a fuel cell stack (), a supply line connection () for connecting a supply line () for supplying coolant to the fuel cell stack (), a discharge line connection () for connecting a discharge line () for discharging coolant from the fuel cell stack (), and a venting line connection () for connecting a venting line ().

Cooling system for fuel cell stacks

The invention relates to a method for operating a fuel cell system () using a first operating mode, in which, when all of the fuel cell stacks () are inactive, one fuel cell stack () is pre-heated using a coolant that is pre-heated by means of an electric heater () while bypassing all cooler circuits () of the active coolant circuits () via bypass lines () and the one pre-heated fuel cell stack () is activated in order to pre-heat an additional fuel cell stack () of the fuel cell system. Other operating modes for operating a fuel cell system are disclosed in additional embodiments.

Method for operating a fuel cell system for a motor vehicle

The invention relates to a fuel cell () comprising at least one membrane/electrode unit () comprising a first electrode and a second electrode, which electrodes are separated from one another by a membrane, and comprising at least one polar plate () which comprises a first distribution region () for distributing a fuel to the first electrode and a second distribution region () for distributing an oxidation agent to the second electrode. The first electrode and the second electrode of the at least one membrane electrode unit () are electrically connected by means of a conductor (). The invention also relates to a fuel cell stack () which comprises a plurality of the claimed fuel cells ().

Fuel cell and fuel cell stack

The invention relates to a fuel cell system () comprising: at least one fuel cell () which has a cathode () with a cathode chamber and has an anode chamber of an anode (), which anode chamber is separated from the cathode chamber by a membrane, wherein the cathode chamber is connected to a cathode gas source via at least one first fluid connection () and the anode chamber is connected to an anode gas source via at least one second fluid connection; and comprising a first electrical connection () to a DC/DC converter () that electrically connects the anode () and the cathode () to an energy system (), wherein in a shut-down phase of the fuel cell system (), residual energy present in the fuel cell () can be discharged. According to the invention, the anode () is connected to the energy system () and/or the cathode () via at least one second electrical connection (), wherein the second electrical connection () is a bypass connection to the DC/DC converter () and/or the second electrical connection () is a bypass connection parallel to the fuel cell (), wherein at least the residual energy can be discharged via the second electrical connection (), and the second electrical connection () comprises a resistor ().

Intrinsically safe bleed-down circuit and control strategy for fuel cell systems

An energy store for a photovoltaic system has: a first capacity range which is provided for feeding into the power grid; a second capacity range which is provided for internal consumption and feeding into the power grid; and a third capacity range which is provided for feeding into the power grid.

Energy store for a photovoltaic system, energy storage power plant, control device, and method for operating an energy store

A power converter module includes: a DC input terminal configured to receive an input voltage from a DC source; an intermediate circuit coupled directly to the DC input terminal; a DC output terminal configured to provide an output direct voltage; an AC output terminal configured to provide an output alternating voltage; a DC converter coupled between the intermediate circuit and the DC output terminal in order to receive an input voltage from the intermediate circuit; an inverter coupled between the intermediate circuit and the AC output terminal in order to draw an input voltage from the intermediate circuit; and a regulating device coupled to the DC converter and to the inverter, the regulating device being configured to regulate the input voltage of the inverter and of the DC converter to a maximum power drain from the DC source.

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Michelbach an der Bilz, Germany

Werner Belschner