Abstract: An electric drive system for a vehicle includes first and second three-phase electric machines driving a vehicle axle and an electrical energy store electrically supplying the first and second three-phase electric machines during a driving operation of the vehicle. A first and second inverter of the first and second three-phase electric machines, respectively, are each coupled to the electrical energy store. The system also includes an onboard charging terminal for electrically coupling the electrical energy store to a charging unit external to the vehicle. According to the first and/or second inverter, a charging voltage of the onboard charging terminal is converted into a supply voltage for charging the electrical energy store.

Abstract: When charging a high-voltage battery at a DC charging station, a first step opens charging contactors, closes switching elements, and charges the high-voltage battery via the on-board charger and to transfer charge from one partial battery to the other partial battery or vice versa by an inverter. In a second step, when the high-voltage battery has been warmed up to a predetermined target temperature by the recharging process, operation of the inverter is stopped, the charging contactors are closed and in parallel with this is charged charging via the onboard charger and charged via the charging contactors, and the on-board charger is then deactivated and the charging process continues exclusively via the charging contactors.

Abstract: A vehicle includes a traction battery, a drive unit having a three-phase motor and an inverter electrically coupled to the three-phase motor, the inverter being electrically coupled to the traction battery, and a charging connection for electrically coupling to a vehicle-external DC charging station. The inverter is a flying capacitor inverter.

Abstract: An insulation monitor for a high-voltage onboard electrical system of a motor vehicle is provided. A respective Y-capacitor is arranged between the positive potential and the vehicle earth and between the negative potential and the vehicle earth. The insulation monitor has a current or voltage source, a voltmeter for measuring at least one of the potentials, and is configured to apply a negative current by the current source when the potential measured by the voltmeter exceeds a predefined upper value and to apply a positive current by the current source when the potential measured by the voltmeter falls below a predefined lower value. The current thus being limited to a maximum permissible contact current in the case of an insulation fault and it is possible to infer the magnitude of the insulation resistances using the voltage measured by the voltmeter and the recharging current that has been fed in.

Abstract: A component arrangement for an electric high-voltage on-board power supply of a vehicle includes a shared EMC filter, a shared intermediate circuit, a plurality of electrical components, and a shared housing. The shared EMC filter and the shared intermediate circuit are provided for the plurality of electrical components. The plurality of electrical components are disposed in the shared housing together with the shared EMC filter and the shared intermediate circuit. The plurality of electrical components are interconnected in parallel with the shared intermediate circuit and the shared EMC filter and there is otherwise no electrical connection between them.

Abstract: An onboard electrical system is disclosed that includes first, second and third onboard electrical sub-systems for an electric drive unit, electric components and a vehicle battery of a vehicle, respectively. In addition, the system includes a charging terminal, wherein a changeover switch, a first switch element, and a second switch element of the onboard electrical system are physically separated from one another. The charging terminal is galvanically connected to the third onboard electrical sub-system by the first switch element and to the second onboard electrical sub-system by the changeover switch during an electric charging mode of the vehicle battery. The first onboard electrical sub-system is galvanically connected to the third onboard electrical sub-system of the second switch element and to the second onboard electrical sub-system by the changeover switch during a driving mode of the vehicle.

Abstract: A direct current converter includes a plurality of direct current converter modules having electrical input voltages and output voltages that differ from each other. The plurality of direct current converter modules are electrically connectable to one another to form a plurality of subsystems such that a high-voltage electrical voltage is convertible into different low-voltage electrical voltages. The plurality of direct current converter modules are configured as a shared integrated assembly. At least one of the plurality of subsystems is always active.

Abstract: A component arrangement for an electric high-voltage on-board power supply of a vehicle includes a shared EMC filter, a shared intermediate circuit, a plurality of electrical components, and a shared housing. The shared EMC filter and the shared intermediate circuit are provided for the plurality of electrical components. The plurality of electrical components are disposed in the shared housing together with the shared EMC filter and the shared intermediate circuit. The plurality of electrical components are interconnected in parallel with the shared intermediate circuit and the shared EMC filter and there is otherwise no electrical connection between them.

Abstract: A motor vehicle shell of a motor vehicle includes a frame structure that is formed by crossmembers and by longitudinal members. The frame structure is closed peripherally and protrudes downwardly in a vertical direction of the motor vehicle from a base element. A receiving chamber for receiving an electrical energy store is delimited by the frame structure. A cover is formed separately from the frame structure and is disposed opposite the base element. The receiving chamber is closed downwardly in the vertical direction of the motor vehicle by the cover. An annular and dimensionally stable intermediary element is formed separately from the frame structure and separately from the cover. The intermediary element is disposed between the frame structure and the cover and the intermediary element is fixed at least in a liquid-tight manner on the frame structure by a firmly bonded connection.

Abstract: An electrical drive system for a vehicle includes an electrical three-phase machine for driving the vehicle, an electrical energy storage device for electrically supplying the electrical three-phase machine during a driving operation of the vehicle, an inverter of the electrical three-phase machine, which inverter is electrically coupled to the electrical energy storage device. The system also includes a charging connection on the vehicle side for electrically coupling the electrical energy storage device to a vehicle-external charging unit. As a function of the inverter, a charge voltage of the charging connection on the vehicle side can be transformed into a supply voltage for charging the electrical energy storage device.

Abstract: An electric driving system for a vehicle includes a switching device having first and second switching states. In the first switching state, in which a charging port is directly connected with an electrical energy storage device of the vehicle, the electrical energy storage device is charged with an input voltage applied to the charging port. In the second and third switching states the charging port is connected with the electrical energy storage device via an inverter such that the electrical energy storage device can be charged depending on the inverter.

Abstract: An electric drive system for a vehicle includes first and second three-phase electric machines driving a vehicle axle and an electrical energy store electrically supplying the first and second three-phase electric machines during a driving operation of the vehicle. A first and second inverter of the first and second three-phase electric machines, respectively, are each coupled to the electrical energy store. The system also includes an onboard charging terminal for electrically coupling the electrical energy store to a charging unit external to the vehicle. According to the first and/or second inverter, a charging voltage of the onboard charging terminal is converted into a supply voltage for charging the electrical energy store.

Abstract: An insulation monitor for a high-voltage onboard electrical system of a motor vehicle is provided. A respective Y-capacitor is arranged between the positive potential and the vehicle earth and between the negative potential and the vehicle earth. The insulation monitor has a current or voltage source, a voltmeter for measuring at least one of the potentials, and is configured to apply a negative current by the current source when the potential measured by the voltmeter exceeds a predefined upper value and to apply a positive current by the current source when the potential measured by the voltmeter falls below a predefined lower value. The current thus being limited to a maximum permissible contact current in the case of an insulation fault and it is possible to infer the magnitude of the insulation resistances using the voltage measured by the voltmeter and the recharging current that has been fed in.

Abstract: An onboard electrical system is disclosed that includes first, second and third onboard electrical sub-systems for an electric drive unit, electric components and a vehicle battery of a vehicle, respectively. In addition, the system includes a charging terminal, wherein a changeover switch, a first switch element, and a second switch element of the onboard electrical system are physically separated from one another. The charging terminal is galvanically connected to the third onboard electrical sub-system by the first switch element and to the second onboard electrical sub-system by the changeover switch during an electric charging mode of the vehicle battery. The first onboard electrical sub-system is galvanically connected to the third onboard electrical sub-system of the second switch element and to the second onboard electrical sub-system by the changeover switch during a driving mode of the vehicle.

Abstract: A method is disclosed for conducting a pre-charging process of an onboard electrical system of a vehicle and for a charging process of a vehicle battery of the vehicle. The charging process immediately follows the pre-charging process. The vehicle battery is galvanically connected to a first onboard electrical sub-system of the onboard electrical system by a first switch element and a changeover switch and is galvanically separated from a charging path of the onboard electrical system by a second switch element. A line capacitor in the charging path is pre-charged to a first voltage value by a power source electrically connected to the charging path. A capacitor in the first onboard electrical sub-system is pre-charged to a second voltage value by the vehicle battery, wherein the vehicle battery is charged by the power source on the basis of the respective state of charge of the line capacitor and the capacitor.

Abstract: A motor vehicle shell of a motor vehicle includes a frame structure that is formed by crossmembers and by longitudinal members. The frame structure is closed peripherally and protrudes downwardly in a vertical direction of the motor vehicle from a base element. A receiving chamber for receiving an electrical energy store is delimited by the frame structure. A cover is formed separately from the frame structure and is disposed opposite the base element. The receiving chamber is closed downwardly in the vertical direction of the motor vehicle by the cover. An annular and dimensionally stable intermediary element is formed separately from the frame structure and separately from the cover. The intermediary element is disposed between the frame structure and the cover and the intermediary element is fixed at least in a liquid-tight manner on the frame structure by a firmly bonded connection.