A battery charging device includes a battery pack including a plurality of battery cells connected in series, and a control unit. The control unit is configured to change a series connection of the battery cells in response to a variation in output voltage of a solar battery.

A battery cell with a galvanic cell, a first semiconductor switching element, a first cell connector electrically coupled directly to a first potential connector of the galvanic cell, and a second cell connector electrically coupled to a second potential connector of the galvanic cell via the first semiconductor switching element. The battery cell further has a third cell connector electrically coupled to the second potential connector of the galvanic cell, a second semiconductor switching element, and a fourth cell connector electrically coupled to the first potential connector of the galvanic cell via the second semiconductor switching element. A third semiconductor switching element is connected between the third cell connector and the fourth cell connector which primarily serves to switch individual battery cells out of the system regardless of the (activation or deactivation) state of the predecessor as well as successor cells.

A method for state-of-charge monitoring of an AC battery, in which the battery includes a central controller having a scheduler, measuring sensors and at least two battery modules. The at least two battery modules each have at least one energy storage element and at least two power semiconductor switches, which connect the respective battery module in series or in parallel or in bypass with another battery module. The battery is controlled by the central controller, and a respective switching state of the at least two battery modules is preset by the scheduler. The state-of-charge monitoring is implemented by a control program within the scheduler. During operation of the battery, a state of each individual energy storage element is monitored by virtue of a respective current flow at a respective energy storage element being determined using continued evaluation of measured values of preset battery parameters which are detected by measuring sensors.

The invention relates to a system having an energy storage device and a DC voltage supply circuit, wherein the energy storage device has at least two energy supply branches, which are each coupled at a first output to at least one respective output terminal of the energy storage device in order to generate an AC voltage at the output terminals, and at a second output to a shared bus, wherein each of the energy supply branches has a plurality of energy storage modules connected in series. The energy storage modules each comprise an energy storage cell module having at least one energy storage cell and a coupling device having a coupling bridge circuit made from coupling elements. The coupling elements are designed to selectively connect the energy storage cell module to the respective energy supply branch or to bypass the energy supply branch. The DC voltage supply circuit has: a bridge circuit having a plurality of first feed terminals, each of which is coupled to one of the output terminals of the energy storage device; two feeding nodes, at least one of which is coupled to the bridge circuit; and a module-tapping circuit that has at least one module switching branch having a commutating diode. Each of the at least one module switching branches connects a coupling node between two energy storage modules of one of the energy supply branches switchably to a feeding node.

A battery system comprising positive and negative charge-discharge terminals, first and second batteries, first and second unidirectional switches, and a bridging switch. The first battery and the first unidirectional switch are connected in series across the charge-discharge terminals such that the first unidirectional switch provides a conductive path from the positive charge-discharge terminal to a positive terminal of the first battery. The second battery and the second unidirectional switch are connected in series across the charge-discharge terminals such that the second unidirectional switch provides a conductive path from the negative terminal of the second battery to the negative charge-discharge terminal. The batteries and the bridging switch are connected in series across the charge-discharge terminals, with the bridging switch being located between the positive terminal of the first battery and the negative terminal of the second battery.

A battery system comprising positive and negative charge-discharge terminals, first and second batteries, first and second unidirectional switches, and a bridging switch. The first battery and the first unidirectional switch are connected in series across the charge-discharge terminals such that the first unidirectional switch provides a conductive path from the positive charge-discharge terminal to a positive terminal of the first battery. The second battery and the second unidirectional switch are connected in series across the charge-discharge terminals such that the second unidirectional switch provides a conductive path from the negative terminal of the second battery to the negative charge-discharge terminal. The batteries and the bridging switch are connected in series across the charge-discharge terminals, with the bridging switch being located between the positive terminal of the first battery and the negative terminal of the second battery.

A battery system includes high-voltage switches, including a multi-pole contactor. Multiple packs are connectable in a series or parallel configuration via the switches. The contactor includes first and second pairs of electrical terminals separated by a respective circuit gap, with respective contactor arms simultaneously closing or opening the gaps. At all times, internal switches formed by the gaps and arms have the same ON/OFF state corresponding to the circuit gaps both being closed or both being open. Two of the contactors may be used to connect the battery packs to a DC fast-charging station, and to connect electrode terminals of the battery packs to a bus rail, respectively. An electric powertrain includes the battery system and an electrical load, including a rotary electric machine, that is connected to a power inverter and to a mechanical load.

A battery system includes high-voltage switches, including a multi-pole contactor. Multiple packs are connectable in a series or parallel configuration via the switches. The contactor includes first and second pairs of electrical terminals separated by a respective circuit gap, with respective contactor arms simultaneously closing or opening the gaps. At all times, internal switches formed by the gaps and arms have the same ON/OFF state corresponding to the circuit gaps both being closed or both being open. Two of the contactors may be used to connect the battery packs to a DC fast-charging station, and to connect electrode terminals of the battery packs to a bus rail, respectively. An electric powertrain includes the battery system and an electrical load, including a rotary electric machine, that is connected to a power inverter and to a mechanical load.

The present disclosure relates to a dual battery system (1) comprising a first battery (B1) and a second battery (B2), for balancing charge level of the first battery and the second battery, the dual battery system being adapted for powering propulsion of an electric vehicle (3) comprising a first electric motor (E1) coupled in driving relationship with one or more rear wheels of the electric vehicle and a second electric motor (E2) coupled in driving relationship with one or more front wheels of the electric vehicle. The first battery is adapted to provide electric power for driving the first electric motor and the second battery is adapted to provide electric power for driving the second electric motor. The dual battery system obtains (100) at least one of data or information of a predetermined and/or imminent charging event of the electric vehicle. The dual battery system furthermore obtains (200) at least one of data or information of charge level of the first battery and second battery respectively. Moreover the dual battery system selects (300), when the charge level of the first battery and the second battery are unbalanced, a driving scenario which comprises charging and/or discharging of at least one of the first battery and the second battery, the driving scenario balancing the charge level of the first battery and the second battery prior to arriving at the predetermined and/or imminent charging event. The disclosure also relates to a dual battery system in accordance with the foregoing, and an electric vehicle comprising such a dual battery system.

A vehicle with electric drive can employ a pulse width modulation technique to govern the amount of drive power provided to the vehicles wheels while also governing the charging power supplied to the storage device. For example, an electric motor, generator, and a drive shaft can all be linked such that when one spins, they all spin. The disclosed technique provides for rapidly switching from powering a wheel to charging the battery. In fact, the switching can be done rapidly enough that the battery can be charged between every pulse provided to the motor. This rapid switching provides for advanced capabilities in energy harvesting and vehicle weight distribution.