Abstract: The invention relates to a battery pack comprising at least one battery cell and a housing for accommodating the at least one battery cell. It is proposed that the housing is designed as at least double-walled having at least one inner sheath and one outer sheath. According to the invention, an intermediate volume is enclosed between the at least one inner sheath and the outer sheath. The intermediate volume is able to absorb a pressure wave from an internal volume containing the battery cells.

Abstract: A hand tool module having an interconnection device, which has an interface. The interconnection device has, in addition to the interface, at least one auxiliary interface, which is provided to bidirectionally exchange at least power at least with one additional hand tool module and/or a hand tool.

Abstract: A method is provided for monitoring a charge state or a charge or discharge current of a rechargeable battery, in particular to a charging or discharging process for a rechargeable battery, in particular a rechargeable lithium-ion battery, the charge state or the charge or discharge current of the rechargeable battery being inferred from a derivation (dU/dt) of a charge voltage (U) or discharge voltage (U) of the rechargeable battery. Also provided are a computer program or a computer program product, an arithmetic unit or a processing device, and a rechargeable battery charger or a rechargeable battery-operated device.

Abstract: A battery charging device includes: a battery housing which delimits at least one battery receiving space at least in part; at least one power electronics unit supplying a charging voltage; and an electronics housing which (i) is formed separately from the battery housing, and (ii) accommodates the power electronics unit in at least one of water-protected manner and dust-protected manner.

Abstract: A battery charging device includes: at least one power electronics unit supplying a charging voltage; at least one cooling unit cooling the power electronics unit; and an electronics housing accommodating the at least one power electronics unit in at least one of water-tight and dust-tight manner. The electronics housing is cooled from the outside by a fan of the at least one cooling unit during at least one operating mode.

Abstract: The invention is based on a rechargeable battery charging case, in particular a cordless handheld power tool case, having at least one battery attachment device and a case body. It is proposed that the rechargeable battery charging case has an electrical energy output and a supply unit, which in at least one operating state is connected to the energy output and to the battery attachment device for supplying the energy output.

Abstract: A method for operating a storage device for storing electrical energy, having at least two storage cells. The storage cells are charged with the aid of a physical charge quantity provided by an electrical charging device, and a physical variable is monitored in each case in the storage cells. As a function of the monitored variables, a control signal is transmitted to the charging device for controlling same, and the charge quantity is successively reduced as a function of the control signal. A related storage device for storing electrical energy is also described.

Abstract: The invention relates to a storage device (101) for storing electrical energy, having a storage cell (103) that is chargeable using an electric charging current, having a charging circuit (105) connected to the storage cell (103) for charging the storage cell (103), having a discharging circuit (107) connected to the storage cell (103) for discharging the storage cell (103) and a monitoring device (109) for monitoring a physical variable in the storage cell (103), a switching element (111) controllable by the monitoring device (109) for interrupting the charging circuit (105) being formed as a function of the monitored physical variable. The invention also relates to a method for operating a storage device (101) for storing electrical energy.

Abstract: The invention relates to a charging device for charging at least one rechargeable energy storage unit, having a defined inner resistance and having a compensation circuit for the compensation of a voltage drop during the charging operation caused by the inner resistance. The compensation circuit has a current detection for detecting a charge current of the rechargeable energy storage unit and a voltage regulator for adjusting the charge voltage to the detected charge current. The charging device is characterized in that the compensation circuit has a voltage distributor between the current detector and the voltage regulator, by the dimensioning of which the compensation of the inner resistance is carried out.

Abstract: The invention is based on a spare handheld power tool module, having at least one interface that has at least one contact region and at least one electrical contact that is disposed at least partly in the contact region. It is proposed that the interface has at least one closure unit, which is provided for covering the contact region.

Abstract: A handheld power tool charger, having at least one battery contact device is proposed, which is provided for charging at least one nondiscretely positioned handheld power tool battery. According to the invention, the battery contact device has at least one contact region which is embodied as elongated.

Abstract: The invention is based on a rechargeable battery charging case, in particular a cordless handheld power tool case, having at least one battery attachment device and a case body. It is proposed that the rechargeable battery charging case has an electrical energy output and a supply unit, which in at least one operating state is connected to the energy output and to the battery attachment device for supplying the energy output.

Abstract: The invention is based on a rechargeable battery charging case, in particular a cordless handheld power tool case, having at least one battery attachment device and a case body. It is proposed that the rechargeable battery charging case has an electrical energy output and a supply unit, which in at least one operating state is connected to the energy output and to the battery attachment device for supplying the energy output.

Abstract: A charging device for a rechargeable energy store which has a first induction coil includes: a coupling surface for positioning the first energy store; a second induction coil for generating a magnetic field in the area of the coupling surface to transfer electrical energy between the first and second induction coils; and a direction control system for bringing an alignment of the field of the second induction coil in line with an alignment of the first induction coil.

Abstract: A handheld tool having a battery interface is described, in which a provision is made for the handheld tool to have at least one measuring device interface, which is provided to receive at least data containing measuring information of a handheld tool add-on measuring device.

Abstract: A charging device (10, 100) includes a charging unit (12) and at least one interchangeable, rechargeable energy storage unit (14), in particular an interchangeable battery (18), of a power tool (16). Each energy storage unit (14) has first contact means (24) for contacting the corresponding power tool (16) and additional contact elements (38) for contacting the charging unit (12) in such a way that the charging unit (12) is able to charge the energy storage unit (14) via the additional contact elements (38), both when the unit is connected to the power tool (16) and when it is disconnected from the power tool (16).

Abstract: A hand tool module having an interconnection device, which has an interface. The interconnection device has, in addition to the interface, at least one auxiliary interface, which is provided to bidirectionally exchange at least power at least with one additional hand tool module and/or a hand tool.

Abstract: A handheld tool battery charging unit, e.g., for a handheld machine tool battery, has at least one battery accommodation region and at least one detachable battery contact unit provided to be connected to at least one battery pack, as well as at least one charging connection element provided for receiving energy transmitted in a wireless manner.

Abstract: A charging device for charging a battery pack, having a control circuit for a switched-mode power supply transformer assigned to the charging device, the transformer having at least one primary winding switchable using a power switch and at least one first secondary winding for generating an electrical output voltage for charging the battery pack, the output voltage having a first amplitude which is predefinable by a control unit and adjustable using a first voltage limiting control loop. The transformer has at least one second secondary winding for generating at least one electrical auxiliary voltage having a second amplitude which is predefinable by the control unit and adjustable using a second voltage limiting control loop in order to at least reduce an energy feed assigned to an operation of the control circuit from the primary winding to the secondary windings in a standby mode of the control circuit.

Abstract: In a charging device having a power element for producing a charge voltage for charging a battery pack from an input voltage provided by an input voltage source, the power element and the input voltage source being capable of being connected to one another in electrically conductive fashion via a separator that can be controlled by a control unit, and the separator being fashioned for the purpose of producing, in an allocated switching mode, an electrically conductive connection between the power element and the input voltage source and, in an allocated separating mode, separating this electrically conductive connection, the control unit is connected, at least for standby power supply, to an allocated energy storage device, and is fashioned for the purpose of controlling the separator during the transition from a charge operating mode to a standby operating mode of the charging device, in order to change the separator over from switching mode to separating mode.