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.

Abstract: The invention relates to a traction battery having a first battery cell group and a second battery cell group. A first connection of the first battery cell group is connected to a first battery pole by a charging and disconnecting device, a second connection of the first battery cell group is connected to a first service plug connection, a first connection of the second battery cell group is connected to a second service plug connection, and a second connection of the second battery cell group is connected to a second battery pole by a disconnecting device. The first service plug connection and the second service plug connection can be short-circuited by an external service plug.

Abstract: A motor vehicle includes an electric drive motor for driving the motor vehicle and a battery connected to the electric drive motor. The battery includes a plurality of battery cell lines, each battery cell line has a plurality of battery cells mounted in series between a respective first pole and a respective second pole.

Abstract: A coupling unit for a battery module, includes a first input, a second input, a first output and a second output. The coupling unit is configured to connect the first input to the first output and the second input to the second output, on a first control signal, and, on a second control signal, to separate the first input from the first output and the second input from the second output, and to connect the first output to the second output.

Abstract: A battery includes at least one battery cell line having a plurality of battery cells mounted in series between a respective positive battery pole and a respective negative battery pole. The battery further includes a pulse width modulation inverter integrated into the battery, at least one first and one second input, and at least one output. The first and second inputs are connected to the positive battery pole or the negative battery pole.

Abstract: A coupling unit for a battery module, includes a first input, a second input and an output. The coupling unit is configured to connect the first input or the second input to the output in response to a control signal. The coupling unit and at least one battery cell are included in a battery module. The at least one battery cell is connected between the first input and the second input of the coupling unit. A first terminal of the battery module is connected to the output of the coupling unit, and a second terminal of the battery module is connected to the second input of the coupling unit.

Abstract: A battery includes at least one battery module line, a sensor means for determining a charging stage of a battery cell, and a control unit. The battery module line includes a plurality of battery modules mounted in series, each module having at least one battery cell and a coupling unit. The at least one battery cell is mounted between a first input and a second input of the coupling unit, and the coupling unit is configured (i) to switch the at least one battery cell between a first terminal of the battery module and a second terminal of the battery module, on a first control signal, and (ii) to connect the first terminal to the second terminal on a second control signal. The sensor means is connectable to the at least one battery cell of each battery module.

Abstract: A battery includes at least one battery module line and a control unit. The at least one battery module line has a plurality of battery modules mounted in series. Each battery module includes at least one battery cell and a coupling unit. The at least one battery cell is mounted between a first input and a second input of the coupling unit. The coupling unit is designed to switch the at least one battery cell between a first terminal of the battery module and a second terminal of the battery module, on a first control signal, and to connect the first terminal to the second terminal on a second control signal. The control unit is designed to transmit the first control signal to a first variable number of battery modules of the at least one battery module line.

Abstract: The invention relates to a battery with a degassing system and to a method for dissipating substances emerging from a battery, by which means the gases and electrolytes which result from chemical activity can be dissipated using simple means in this way, and battery cells are protected against damage. The invention provides that the battery with the degassing system comprises a base plate (22) and at least one cell module (12) which is arranged on the base plate (22) and has at least one battery cell (16), wherein the battery cell (16) has an upper face (34), which is provided with cell terminals (14), and a lower face (36), which is provided with at least one degassing opening (18), and the base plate (22) has at least one aperture to a catchment area at the location of the at least one degassing opening (18), wherein the lower face (36) is arranged opposite the upper face (34) and the lower face (36) is arranged below the upper face (34) in the direction of the force of gravity.

Abstract: A battery system for a motor vehicle having an internal combustion engine includes at least one starting circuit, a low-voltage on-board supply system, and an on-board supply system with an increased voltage. The starting circuit has a first battery and a starter that is configured to be connected to the first battery. The low-voltage supply system has at least one electrical consumer and a second battery configured to produce a first voltage. The supply system with increased voltage has an electrical generator and a third battery configured to produce a second voltage that is higher than the first voltage. The electric generator is configured to produce a third voltage that is higher than the second voltage. A first coupling connects the supply system with increased voltage to the low-voltage supply system and transfers energy therebetween. A second coupling connects the low-voltage on-board supply system to the starter circuit.

Abstract: A battery system for a motor vehicle is disclosed. The battery system includes an internal combustion engine, said battery system comprising at least one starting circuit, a low-voltage on-board supply system, and an on-board supply system with an increased voltage. The starting circuit has a starter battery and a starter that is connected, or can be connected, to the starter battery, said starter being used to start the internal combustion engine on a starter signal. The low-voltage on-board supply system has an on-board supply system battery used to produce a first voltage and to transmit same to the low-voltage on-board supply system, and at least one electrical consumer . The on-board supply system with increased voltage has at least one electric generator that can be operated by the internal combustion engine and is used to produce a second voltage higher than the first voltage and to transmit said second voltage to the on-board supply system with increased voltage.

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: In a method and a device for determining the internal resistance of a battery cell of a battery, the battery is connected to a controllable motor/generator in such a way that a flow of energy can take place from the battery to the motor/generator or from the motor/generator to the battery, including the following steps: modulation of the magnetic field-forming portion of the motor/generator, determination of a change in voltage at the battery cell and of a change of the current flow through the battery cell during the modulation of the magnetic field-forming portion of the motor/generator, and calculation of the internal resistance of the battery cell as the quotient of the change in voltage and the change in current flow.

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 for balancing the electrical group voltages of at least two accumulator groups which are connected in series and each of which have a plurality of accumulator units provides that one accumulator group is connected to the winding of a coil in order to excite the coil, and the other accumulator group is charged by the excited coil by the subsequent connection of the winding to the other accumulator group. In addition, a corresponding electrical accumulator is provided.

Abstract: A method and device is disclosed for application of a pressure to a battery which has at least one or more cells, in order to reduce adverse effects on operation which occur because of different battery states of charge. The device is designed to carry out the method such that the pressure is adjusted as a function of the respective battery volume and/or of the respective battery state of charge.

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: The invention relates to a method and a device for determining the internal resistance of a battery cell of a battery, in particular a traction battery, in which an inductive cell balancing for balancing the charging states of the battery cells is carried out, whereby the charge removed from or supplied to a battery cell is determined by a determination of the current flowing during the removal or supply of the charge. According to the invention, a first control module is provided for determining a first voltage applied to the battery cell and a first current flowing from or to the battery cell at a first time during removal or supply of the charge and for determining a second voltage applied to the battery cell and a second current flowing from or to the battery cell at a second time during removal or supply of the charge.

Abstract: The invention relates to a method and a device for determining the properties of a battery, in particular a traction battery. Particularly the invention determines a battery state such as the capacity and/or a charging state and/or a remaining service life of the battery, preferably with an observer and a battery model for a model-based state identification. According to the invention, a querying module for querying an operational state of a consumer supplied by a battery and a first control module for starting the determination of the properties of the battery, only when the operational state of the supplied consumer shows that it does not operate in the principal mode, are provided.

Abstract: The invention relates to a method and a device for determining the internal resistance of a battery cell of a battery, in particular a traction battery, in which the method can be used either during charging processes or discharging processes and in phases in which the battery including the battery cell does not supply or receive any electrical power, in which resistive cell balancing for balancing the charging states of the battery cells is carried out in the battery, whereby energy is removed from the battery cell via a resistor. According to the invention, a first control module is provided for determining a first voltage applied to the battery cell and a first current flowing from or to the battery cell at a first time during removal or supply of the charge and for determining a second voltage applied to the battery cell and a second current flowing from or to the battery cell at a second time during removal or supply of the charge.