Andreas Stihl Ag Co. Kg

Universitaet Stuttgart

Christian Saemann

Malte Von Hofen

Markus Schubert

Ahmed Garamoun

Juergen H Werner

Juergen Koehler

Florian Schumayer

A method determines at least one power contact resistance or at least one resistance value corresponding to the at least one power contact resistance between at least one pack power contact of a battery pack and at least one apparatus power contact of an electrically driven work apparatus or of a charging apparatus. The pack power contact and the apparatus power contact touch one another and are loaded with a power current. The battery pack and the work apparatus or the charging apparatus are electrically connected by a data communication line for transmitting a data communication signal. The method determines the power contact resistance or the resistance value by comparing a signal voltage variable of the data communication line and a power voltage variable of the at least one pack power contact or of the apparatus power contact with one another, wherein the signal voltage variable or the power voltage variable is dependent on a voltage drop caused by the power current and the at least one power contact resistance.

Method and system for determining at least one power contact resistance

A structure for a battery pack for supplying an electrically driven work appliance with electrical drive power has a number of cell holder parts. The number of cell holder parts is designed for holding battery cells. At least two cell holder parts are designed for arrangement together in a holding arrangement and, in the holding arrangement, for jointly holding the battery cells. The cell holder parts, in the holding arrangement, jointly form at least a predominant part of a filling mould. The filling mould is designed for filling with a protective material for enclosing at least a part of a battery pack electronics unit. Additionally or alternatively, the structure has at least one cast assembly, wherein the cast assembly unites one of the number of cell holder parts and at least one casted-in cell contactor. The cell contactor is designed for contacting at least one cell terminal of at least one of the held battery cells.

Structure for a battery pack for supplying an electrically driven work appliance with electrical drive power, battery pack, work system and method for producing a battery pack

A method is disclosed for producing a battery preparing a first electrode by providing a substrate and depositing onto the substrate at least one silicon-based semiconductor layer of a specific porosity, in particular a doped micro-crystalline silicon layer that may comprise additions of Ge, Sn and/or C; treating the semiconductor layer using laser radiation for fully or partially varying the porosity, in particular by increasing the porosity of active regions for accommodating ions, in particular lithium-ions, or for reducing the porosity of inactive regions, for decreasing the ion-absorption capacity; arranging the first electrode together with a second electrode and an electrolyte within a housing; and contacting the two electrodes and connecting with external terminals accessible from outside the housing. Also disclosed is a battery made according to the disclosed method.

Battery and method for producing a battery

Growing community of inventors

Stuttgart, Germany

Christian Saemann