Robert Boschgmbh

Nikola Corporation

Arpad Imre

Armin Schuelke

Kevin M Lynk

Jesse Michael Schneider

Bernd Dittmer

Jorg Heyse

Werner Belschner

Alexander Schmidt

Niko Dorsch

Jörg Heyse

Peter Eckert

Herbert Schoenfelder

Ascertaining a charge state of a battery system that includes at least one battery cell and one additional energy store that is connected in series with the at least one battery cell and can be switched in and out. One method includes switching in the additional energy store; measuring a voltage of the additional energy store at predefined time intervals; ascertaining a capacity change of the additional energy store with reference to the measured voltage and to a characteristic voltage curve of the additional energy store; ascertaining a charge throughput of the additional energy store with reference to the ascertained capacity change of the additional energy store; and ascertaining the charge state of the battery system with reference to the ascertained charge throughput.

Method for ascertaining a charge state of a battery system, battery system

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

An electrode arrangement of a battery cell () comprising a positive electrode layer () and a negative electrode layer (), which are separated from one another in an electrically insulating manner by a separator layer (), wherein the positive electrode layer () forms a plurality of first contacting sections () formed in each case for an electrical contacting of the positive electrode layer () by a first current conductor (), and the negative electrode layer () forms a plurality of second contacting sections () formed in each case for an electrical contacting of the negative electrode layer () by a second current conductor ().

Electrode arrangement of a battery cell, electrode layer and battery cell and method for producing the latter

A contact element for mechanically, thermally and electrically contacting at least one energy store at least partially delimits at least one accommodating space for accommodating the at least one energy store. The contact element is designed for a force-fit, form-locked and/or integral joint with at least one subarea of the energy store, the contact element being at least partially electrically conductive, and the contact element being at least partially thermally conductive.

Contact element for mechanically, thermally and electrically contacting an energy store

A battery module having a plurality of battery cells positioned adjacent to one another and electrically connected to one another, between which the thermal resistance between adjacent battery cells may be increased in the case of a malfunction of the battery module and/or of individual battery cells, in order to prevent overheating of adjacent cells. In addition, a method for thermally decoupling battery cells in the case of a malfunction is described.

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Vaihingen, Germany

Arpad Imre