Abstract: A method for determining an internal ohmic resistance of a first battery module includes measuring a first voltage intensity of the first battery module. The first battery module is connected to at least a second battery module. The at least second battery module is under a load current. A second voltage intensity of the first battery module is measured. The first battery module is disconnected from the at least second battery module to enable the measurement of the first voltage intensity and the connection of the first battery module.

Abstract: A battery comprises a number n of battery module strings, wherein n is a natural number greater than or equal to two. The battery module strings have several battery modules, and one battery module has a coupling unit. The coupling unit is configured as a voltage transformer and couples the battery modules to each other. A method of controlling the battery includes supplying a load connected to the battery with a predefined and substantially constant total power. The total power corresponds to a sum of n individual powers of the n battery module strings. The method further includes setting n?1 string voltages, which are each present at the n?1 battery module strings, according to the total power, the load, and by defining a string voltage present at an nth battery module string with amplitude and phase position. At least two of the n individual powers are asymmetrical to each other.

Abstract: A battery cell unit includes a battery cell and a monitoring device for monitoring the state of the battery cell. The monitoring device comprises an actuating device configured to activate an impedance spectroscopy mode provided by the battery cell unit, in which impedance spectroscopy mode measurement currents can be applied to the battery cell to perform impedance spectroscopy of the battery cell, said measurement currents flowing through the battery cell and comprising alternating currents at different frequencies. The monitoring device also comprises a sensor device designed to detect the measurement currents and the corresponding measurement voltages, each of which is a battery cell voltage arising as a response to a measurement current, such that a complex impedance of the battery cell can be determined from the measured values of the measurement currents and the measurement voltages as a function of the frequency of the measurement currents within predetermined tolerance limits.

Abstract: A hard shell cell housing for an individual alkali metal cell includes a housing main body with an interior space that is configured to accommodate cell components of the individual alkali metal cell, and a housing cover configured to close off the interior space. The housing main body is formed at least substantially from plastic, and further includes at least one vapor barrier layer.

Abstract: A battery includes at least two battery cells arranged adjacent to one another and each arranged in a battery cell housing. Each battery cell has at least one battery cell terminal. The battery also includes one degasification element per battery cell. Each degasification element is arranged within the battery cell housing associated with the respective battery cell and is configured to discharge gases generated within the respective battery cell from the respective battery cell in the presence of a predetermined gas pressure. The battery also includes a cover configured to cover at least a part of the surfaces of the battery cells and cover the degasification elements of the battery cells in air-tight fashion. The cover has, in each case in a region of the degasification elements, predetermined breaking points assigned to the degasification elements.

Abstract: The disclosure relates to a method for transferring batteries to a discharged state, a battery system, an inverter, a system for generating an AC voltage, a charging current source and a motor vehicle. The battery system includes a controllable inverter having parallel current branches and having series-connected power switches that are switchable by external control of the controllable inverter. The battery system further includes a controllable charging and disconnecting device having an interrupted current path and having a charging current source between the battery and the controllable inverter.

Abstract: An encasement (20) for a battery cell (2) and for a battery system (1) wherein said encasement is in the form of a sheet and comprises a core layer (22). This core layer (22) comprises carbon nanotubes. The invention further relates to a process for producing an encasement (20) which comprises initially coating a polymer substrate with an oxide material and applying carbon nanotubes to an oxide layer thus formed.

Abstract: The disclosure describes a method for determining a coulombic efficiency of battery modules of a rechargeable battery using a circuit arrangement connected to the battery modules and that has a plurality of switching modules for selectively connecting every single one of the battery modules in a common current path or for alternatively isolating every single one of the battery modules from the common current path and from at least one power semiconductor element, which can be operated in linear mode, for regulating the current that flows through the current path. The switching modules are used to select at least one of the battery modules and to connect it in the current path while all other battery modules are isolated from the current path by the switching modules. The selected battery module is subjected to at least one discharge process and at least one charging process via the current path.

Abstract: A method for determining the internal resistance of battery cells of battery modules of a battery includes measuring a first voltage of at least one battery cell of a first battery module at a first time. The first battery module is decoupled from the battery module string in response to a control signal. The first battery module is connected to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module. A second voltage is measured at a second time where the first battery module is connected to the battery module string for a predefined time interval. The internal resistance is determined with reference to a difference between the first and the second voltage and the current flowing through the first battery module.

Abstract: The invention relates to a method for operating a battery system (EB), preferably a lithium-ion battery system, containing at least one battery device, wherein in the case that a safe state of the at least one battery device is brought about from an irregular operating state of the at least one battery device, a current state of the at least one battery device is continuously checked and evaluated by means of at least one component (CSC) of the battery system and the bringing about of the safe state is performed in dependence on the current state of the at least one battery device or an environmental state of the at least one battery device, wherein in particular after the safe state of the at least one battery device has been brought about, hazard information is transmitted to a battery management system (BMS) by means of the at least one component (CSC) of the battery system (EB), wherein the hazard information in particular is hazard information about the current state of the at least one battery device an

Abstract: A battery includes at least one battery module that has several battery cells arranged next to each other on a support plate. The battery module is arranged with the support plate on a base plate of the battery or on a base plate of a lower unit of the battery. The support plate and the base plate are fixed together by at least one fixing system that includes at least two fixing elements engaging in each other. The first fixing element is arranged on the battery module and the second fixing element is arranged on the base plate. A motor vehicle includes the battery.

Abstract: The invention relates to a method for operating an on-board electrical system (1) for a motor vehicle, wherein the on-board electrical system (1) has a low-voltage electrical subsystem (21) with at least one low-voltage load (29) and a starter (26), and has a high-voltage electrical subsystem (20) having at least one high-voltage load (25) and one electrical generator (23), wherein the high-voltage electrical subsystem (20) is connected to the low-voltage electrical subsystem (21) by means of a coupling unit (33) which is designed to draw energy from the high-voltage electrical subsystem (20) and to supply energy to the low-voltage electrical subsystem (21), wherein the high-voltage electrical subsystem (20) has a battery (40) which is designed to generate the high voltage and output said high voltage to the high-voltage electrical subsystem (20), and which has at least two battery units (41-1, 41-2, . . . , 41-n) with line sections (80-11, 80-12, . . . , 80-n2) which are routed to the coupling unit (33).

Abstract: The disclosure relates to a method for charging an intermediate circuit capacitor in an electric drive unit comprising an electric motor. The intermediate circuit capacitor is charged by an intermediate circuit current that is supplied by a battery. The output voltage of the battery is settable to one or more voltage values. A target value of the intermediate circuit current is determined, and an actual value of the intermediate circuit current is ascertained. The actual value of the intermediate circuit current is then compared with the target value of the intermediate circuit current. An optimal output voltage of the battery is determined on the basis of the comparison of the actual value of the intermediate circuit current with the target value of the intermediate circuit current. Then, the optimal output voltage of the battery is set.

Abstract: A method for determining the charge state of battery cells or battery modules of a battery includes monitoring several battery cells or at least one battery module using a plurality of cell monitoring units. The respective electric current of the battery cells or battery modules is measured by the cell monitoring units, the battery current is measured, and the measured current value is transmitted to the plurality of cell monitoring units. A charge state is calculated in each of the cell monitoring units for the respective monitored battery cells, or respectively, the at least one battery module. A battery management system is configured to carry out the method for determining the charge state of the battery cells or battery modules of the battery. A battery and a motor vehicle include the battery management.

Abstract: The disclosure relates to a method for detecting a triggering of a security device. The security device is associated with a battery cell and is triggered if a security-critical situation is present in the battery cell. Initially an actual time path of a parameter of the battery cell is detected. At the same time, an expected time path of the parameter is determined, in particular using a model. Then, the actual time path is compared to the expected time path of the parameter. Finally, based on the comparison, it is determined whether to trigger the security device or not.

Abstract: The disclosure relates to a power supply device for an electrically operable vehicle having an electric drive motor. The power supply device comprises an electric energy accumulator device, a range-extender with an internal combustion engine and a generator producing alternating current. The generator is mechanically connectable to the internal combustion engine, and the energy accumulator device is configured to be charged during driving with the alternating current from the generator. The energy accumulator device comprises several power supply connections on which respectively one of several controllable potentials can be provided, and several power supply branches having several serially connected power cell modules. Several power supply branches are interconnected on one end to the neutral point and each power supply connection is connectable to one end of a power supply branch.

Abstract: The disclosure relates to an electrical system for a vehicle, comprising a low-voltage sub-network for at least one low-voltage load and comprising a high-voltage sub-network for at least one high-voltage load and an electric generator. The high-voltage sub-network has a battery which is designed to generate a high-voltage and output same to the high-voltage sub-network and which has at least two battery units with individual voltage taps. The high-voltage sub-network is connected to the low-voltage sub-network via a coupling unit which is designed to draw energy from the high-voltage sub-network and supply said energy to the low-voltage sub-network. The coupling unit is designed to selectively connect the battery units to the low-voltage sub-network. The disclosure further relates to a method for operating an electrical system, to a motor vehicle, and to a battery management system and a computer program which are designed to carry out the method.

Abstract: The disclosure relates to a vehicle electrical system for a motor vehicle. The vehicle electrical system comprises: a low-voltage sub-system for at least one low-voltage load; a high-voltage sub-system for at least one high-voltage load; and a starter/generator; wherein the high-voltage sub-system is connected to the low-voltage sub-system by means of a coupling unit designed to draw energy from the high-voltage sub-system and to feed said energy to the low-voltage sub-system, wherein the high-voltage sub-system has a battery, which is designed to produce the high voltage and to output the high voltage to the high-voltage sub-system and which has at least two battery units having individual voltage taps, which are led to the coupling unit. The coupling unit is designed to selectively connect the battery units to the low-voltage sub-system. The disclosure further relates to a motor vehicle, comprising an internal combustion engine and such a vehicle electrical system.

Abstract: The disclosure relates to a method for determining a Coulombic efficiency of battery modules of a rechargeable battery with a circuit arrangement connected to the battery modules. The circuit arrangement has multiple current paths, each of which has a series circuit of switch modules and at least one power semiconductor element which can be operated in a linear mode in order to regulate the current flowing through the respective current path, and one of the battery modules is connected to each of the switch modules. Each of the switch modules is configured as a switch module for selectively connecting the connected battery module into the respective current path or to alternatively remove the connected battery module from the respective current path. In each of the current paths at least one of the battery modules is selected with the switch module.

Abstract: An on-board electrical system for a motor vehicle is disclosed. The on-board electrical system has a low-voltage subsystem for at least one low-voltage load, and has a high-voltage subsystem for at least one high-voltage load, and has a starter generator, wherein the high-voltage subsystem is connected to the low-voltage subsystem by means of a coupling unit, wherein the on-board electrical system has a battery which has at least two battery units having individual voltage taps which are routed to the coupling unit. In this case, the coupling unit is designed such that, in a first operating state, the high-voltage subsystem is fed from all of the battery units and the low-voltage subsystem is fed from one battery unit, and, in a second operating state, the high-voltage subsystem is fed from one battery unit and the low-voltage subsystem is fed from at least one battery unit.