Abstract: A DC/DC converter circuit includes at least two DC/DC converters and a low-pass filter, the DC/DC converters in each case having one input side and one output side. The DC/DC converters are connected to each other in series on their output side, and the low-pass filter is post-connected to the DC/DC converters that are connected in series to each other, so as to smooth the output voltage generated by the DC/DC converters at their output side.

Abstract: A method is used to monitor a disconnection device of a battery system having a battery with a plurality of battery cells. The method includes using a monitoring device, which is connected to the disconnection device, to detect a negative voltage or a positive voltage which is applied to connections of the disconnection device. The method also includes evaluating the detected applied negative voltage or positive voltage to establish a functional state of the disconnection device. The method also includes initiating measures to protect the battery system against manipulation of its disconnection device when a value of detected applied negative voltage or positive voltage exceeds a predetermined threshold value.

Abstract: A drive unit for an electric motor comprises a multilevel inverter and a battery. The battery comprises at least one battery module train comprising a plurality of battery modules connected in series, each module having at least one battery cell and one coupling unit. The at least one battery cell is connected between a first input and a second input of the coupling unit. The coupling unit is designed to connect the at least one battery cell between two terminals of the battery module in response to on a first control signal and to connect the two terminals in response to a second control signal. Several center taps are arranged on the battery module train, by means of which a potential can be tapped at a connection between two battery modules respectively. Inputs of the multilevel inverter are connected to the taps.

Abstract: A battery management system includes at least one cell monitoring unit with a plurality of cell voltage terminals, supply lines coupled to the cell voltage terminals, and a cell monitoring circuit made of a plurality of electronic semiconductor modules connected in parallel via the supply lines. The battery management system is configured to monitor a plurality of battery cells via the cell monitoring unit. The battery cells are in each case connected on both sides with their respective positive battery cell terminal and negative battery cell terminal to the battery management system via the cell voltage terminals. Furthermore, one or several supply lines are provided with a melt fuse so that in each battery cell that is connected to the battery management system at least one supply line coupled to the battery cell comprises a melt fuse in its current path.

Abstract: A battery system is described, comprising a battery management unit, a battery cell monitoring unit, at least one battery cell and a safety electronics system for the battery cell. The safety electronics system has a first comparator and an alarm signal output for an alarm signal. The first comparator compares a battery cell voltage of the battery cell to a predetermined threshold voltage value and generates the alarm signal on the basis of the comparison. The battery threshold voltage is lower than the battery cell voltage in normal operation and higher than a critical voltage value. In addition, a motor vehicle with the battery system is described, the battery system being connected to a drive system of the motor vehicle.

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: An energy supply system including an electrical energy storage system having multiple storage modules, in particular a battery system, an ascertaining device for ascertaining state variables of the storage modules and an energy transmission device for energy transmission between the storage modules and a downstream electrical device. It is provided that the energy transmission device has multiple d.c. chopper converters, which are connected to one another in parallel and/or in series at the output end, and each of the d.c. chopper converters is connectable to a storage module of the energy storage system, and the energy supply system has a trigger device for triggering the d.c. chopper converters as a function of the ascertained state variable of the respective connected storage module. Also described is a method for operating an energy supply system.

Abstract: The present disclosure relates to a battery management system for at least one battery cell, for example a lithium-ion battery cell, and to a motor vehicle and to a battery system. A battery management system for at least one battery cell is configured in such a way that, in reaction to a triggering signal, said battery management system can make available a current path between poles of the at least one battery cell. In this context, the current path is configured in such a way that by making available the current path a light arc in a fuse of the at least one battery cell after the triggering of the fuse is prevented or ended. This increases the protection against hazards which can arise from a battery cell in hazardous situations for a vehicle.

Abstract: A method for operating a battery system (EB). The battery system (EB) contains at least one battery apparatus. If a safe state of the at least one battery apparatus is brought about from an irregular operating state of the at least one battery apparatus, a present state of the at least one battery apparatus is continually checked and rated by at least one component (CSC) of the battery system and the safe state is brought about on the basis of the present state of the at least one battery apparatus or of an ambient state of the at least one battery apparatus. In that returning the at least one battery apparatus to a regular operating state utilization of at least one of a group including a key, a smartcard, a radio signal, and an input of a security code is required.

Abstract: A safety device for batteries having battery cells that are configured to connect to poles of the battery via charging and isolating devices includes an apparatus. The apparatus is configured to discharge the battery cells. The apparatus is further configured to connect parallel to the battery cells. The apparatus can be a component of an inverter. The inverter includes electronic valves configured to switch on and off. The inverter is connected to poles of the battery. The electronic valve has at least one semiconductor switch of one electromechanical switch.

Abstract: A housing for a battery cell, preferably for a lithium-ion cell, includes a housing cover, and a metal-core printed circuit board on the housing cover. The housing further includes an electronic component that is configured to monitor the battery cell, and that is arranged on the metal-core printed circuit board on the housing cover. This configuration enables the temperature of the battery cell to be very precisely and cost-effectively determined by very good thermal coupling to the housing cover. The disclosure further relates to a battery cell, a battery module and a vehicle.

Abstract: A method for operating an electric traction drive system includes monitoring each of battery modules during operation for satisfactory functioning to detect a technical fault. The method further includes bypassing at least one battery module if a technical fault of the at least one battery module is detected. The method further includes operating the traction drive system in a traction state where an electric motor is supplied and actuated by connected battery modules to the battery module line to enable a currently generated torque to remain unchanged. The electric motor and the battery are positioned to generate an adjustable output voltage of the battery. The battery is configured to supply the electric motor. The battery includes a battery module line and the battery modules. The battery modules are configured to be connected in series with the battery module line or bypassed in the battery module line.

Abstract: A safety device for a battery having battery cells that are configured to connect to poles of the battery via charging and isolating devices includes a discharge device. The discharge device is configured to connect in parallel to the battery cells. The discharge circuit can include at least one discharge resistor and an electronic valve. The electronic valve is configured to switch on and off. The discharge circuit can be configured to activate with a battery management system.

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 one second battery module subject to a current load after obtaining the first voltage intensity. A second voltage intensity of the first battery module is measured after the connection of the first battery module. The internal ohmic resistance is determined with reference to the first voltage intensity and the second voltage intensity.

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 method for determining the internal resistance of battery cells includes connecting at least one first decoupled battery module to a battery bank to generate a first voltage during the operation of an electric motor. The battery cells are arranged in battery modules of a battery. The battery is connected to the electric motor. The battery modules are arranged at least one battery bank and the battery modules are configured to connect in series to the battery bank to generate an output voltage of the battery and decouple from the battery bank. The method further includes determining the internal resistance of the first battery module during the connection of the battery module. The method further includes decoupling a predetermined number of second battery modules from the battery bank where the second battery modules generate a second voltage similar to the first voltage within a predetermined tolerance limit.

Abstract: An energy transformer for a battery system is disclosed. The energy transformer includes a plurality of DC/DC converters each having a first and a second input and a first and a second output. The first output of a first of the DC/DC converters is connected to a first output of the energy transformer and the second output of a last of the DC/DC converters is connected to a second output of the energy transformer. The first and second inputs are designed for connecting a battery module. The DC/DC converters are connected in series on the output side. The energy transformer has a plurality of first diodes each of which have an anode connected to the first input of one of the DC/DC converters and a cathode connected to the second input of another DC/DC converter so that the DC/DC converters are connected in series on the input side and via a second diode having an anode connected to the first input of the first of the DC/DC converters and a cathode connected to the first output of the energy transformer.

Abstract: A battery system includes a battery, a DC voltage intermediate circuit connected to the battery, an inverter connected to the DC voltage intermediate circuit and an electric motor connected to the inverter. The DC voltage intermediate circuit includes a capacitor, and the battery includes a battery module line having a plurality of battery modules which are connected in series, and a control unit. Each battery module includes a coupling unit and at least one battery cell which is connected between a first input and a second input of the coupling unit. The coupling unit is configured to connect the at least one battery cell between a first terminal of the battery module and a second terminal of the battery module in response to a first control signal, and to connect the first terminal to the second terminal in response to a second control signal.

Abstract: A battery includes a first terminal, a second terminal, a first battery module, a second battery module, and a third batter module. The first battery module and the second battery module includes a first pole, a second pole, a plurality of battery cells, a charge and disconnect device, a disconnect device, and a bridging device. The third battery module includes a first pole, a second pole, a plurality of battery cells, a first disconnect device, a second disconnect device, and a bridging device. The first and second poles of the first battery module are connected in series with the first terminal and the first pole of the third battery module. The first and second poles of the second battery module are connected in series with the second terminal and the second pole of the third batter module.

Abstract: A method is disclosed for adjusting a voltage of a DC-voltage intermediate circuit in a battery system having a battery and a drive system. The battery is configured to output one selectable output voltage from n+1 different output voltages. In a first step of the method, an actual value of the voltage of the DC-voltage intermediate circuit is determined, and is then compared with the various output voltages of the battery. A first selected output voltage of the battery, which is the highest voltage of those output voltages of the battery which are less than the actual value of the voltage of the DC-voltage intermediate circuit, and a second selected output voltage of the battery, which is the lowest voltage of those output voltages of the battery which are higher than the actual value of the voltage of the DC-voltage intermediate circuit, are then selected.