Abstract: A sensor element for detecting at least one property of a measuring gas in a measuring gas chamber, in particular for detecting a proportion of a gas component in the measuring gas or a temperature of the measuring gas, includes a ceramic layer construction that includes at least one electrochemical cell, the electrochemical cell having at least one first electrode, a second electrode, and at least one solid electrolyte connecting the first electrode and the second electrode. The second electrode is situated in the layer construction facing an electrode cavity that is in the layer construction. The second electrode has at least one outer diameter that is greater than a corresponding outer diameter of the electrode cavity.

Abstract: The present invention relates to a safety device (20) for decreasing the total power output of a battery element (12) comprising at least one component (26) with porous material, especially of a Li-ion battery element (16), in response to a trigger signal, which safety device (20) includes a compression unit (22) for actively compressing at least the component (26) with the porous material, wherein the compression unit (22) is suitable for compressing the porous material in such way that the output current of the battery element (12) is significantly reduced as a result of a reduction of the porosity of the porous material due to the compression. The present invention further relates to a corresponding safety system (14), a corresponding battery unit (10) and a corresponding method for discharging a battery element (12).

Abstract: The invention relates to a battery cell, in particular a lithium ion battery cell, having a cathode (3) comprising a cathode active material (333) and having an anode (1) comprising an anode active material (111), wherein the cathode active material (333) and/or the anode active material (111) is/are structured in such a way that between contiguous cathode active material regions (333a) and/or between contiguous anode active material regions (111a) there are hollow spaces (4) which spatially separate the contiguous cathode active material regions (333a) and/or the contiguous anode active material regions (111a) from one another and wherein the hollow spaces (4) are at least partly filled with an electrically insulating material (5).

Abstract: A sensor element for detecting at least one property of a measuring gas in a measuring gas chamber, in particular for detecting a proportion of a gas component in the measuring gas or a temperature of the measuring gas, includes a ceramic layer construction that includes at least one electrochemical cell, the electrochemical cell having at least one first electrode, a second electrode, and at least one solid electrolyte connecting the first electrode and the second electrode. The second electrode is situated in the layer construction facing an electrode cavity that is in the layer construction. The second electrode has at least one outer diameter that is greater than a corresponding outer diameter of the electrode cavity.

Abstract: A turbine wheel for a continuous-flow machine includes a centrally arranged hub with circumferentially arranged blades and a pressure equalizing channel. The hub is configured to enclose a cavity, and a resulting principle axis of inertia of the turbine wheel coincides with an axis of rotation of the turbine wheel. The pressure equalizing channel is configured to fluidically connect the cavity to at least one axial end face of the hub and to an environment of the turbine wheel. A diameter of the pressure equalizing channel is smaller than a diameter of the cavity. In one embodiment, the turbine wheel is for an exhaust gas turbocharger.

Abstract: A lithium-sulfur cell comprising an anode structure, a cathode structure and an electrolyte section abutting to the cathode structure. The cathode structure comprises a continuous layer of nanotubes or nanowires and sulfur particles. The sulfur particles are attached to the nanotubes or nanowires. The continuous layer of nanotubes or nanowires abuts to at least a part of the electrolyte section. The invention further relates to a corresponding method for manufacturing the inventive cell.

Abstract: A lithium-sulfur cell comprising an anode structure, a cathode structure and an electrolyte section abutting to the cathode structure. The cathode structure comprises a continuous layer of nanotubes or nanowires and sulfur particles. The sulfur particles are attached to the nanotubes or nanowires. The continuous layer of nanotubes or nanowires abuts to at least a part of the electrolyte section. The invention further relates to a corresponding method for manufacturing the inventive cell.

Abstract: A piezoelectric actuator has stacked ceramic layers of a piezoelectric material and electrodes situated between the layers to form a piezoelectric stack and having at least one structure that reduces the mechanical strain occurring in the piezoelectric stack. The strain reducing structure is comprised of a strain-reducing layer equipped with recesses and is typically situated between the ceramic layers. In particular, the recesses of the strain-reducing layer are situated in an outer region of the layer and is comprised of a notch which significantly reduce the mechanical strains inside the actuator.