A disconnection device for a high-voltage electrical system of a motor vehicle for disconnecting a high-voltage line of the high-voltage electrical system, includes an overcurrent protection apparatus; a first disconnecting unit which is made of a first actuatable disconnecting unit, the first disconnecting unit being designed to interrupt a current flow over the first disconnecting unit in the activated state; a second disconnecting unit which is made of a second actuatable disconnecting unit and the overcurrent protection apparatus, the second disconnecting unit being designed to conduct an overcurrent to the overcurrent protection apparatus which interrupts the current flow over the second disconnecting unit in the activated state; and a control unit which is designed to activate at least the second disconnecting unit in the event of an overcurrent and to activate at least the first disconnecting unit in the event of an overcurrent-independent event in order to separate the high-voltage line.

A work machine includes: a controller; a first electrical circuit provided with a first power supply that supplies power to the controller; an electric drive source necessary for operating the work machine; and a second electrical circuit provided with a second power supply that supplies power to the electric drive source. The work machine further includes: a capacitor provided to the second electrical circuit; a first precharge device that performs precharge of the capacitor by using power of the first power supply; and a second precharge device that performs precharge of the capacitor by using power of the second power supply. The controller performs precharge by using one of the precharge devices when it is determined that precharge by using the other one of the precharge devices is impossible.

Embodiments of the present disclosure relate to the field of battery technologies, and disclose a pre-charging circuit for a high voltage battery pack and a pre-charging method therefor. In some embodiments of the present disclosure, during a charging process, a control module switches on a charging switching module and switches off a charging pre-charging module after determining that a voltage at the first end of the charging switching module and a voltage at the second end of the charging switching module comply with a first constraint relationship; during a discharging process, the control module switches on the main positive switching module and switches off the main positive pre-charging module after determining that a voltage at the first end of the main positive switching module and a voltage at the second end of the main positive switching module comply with a second constraint relationship.

A method for controlling electrical connection of a plurality of battery packs of an electric energy storage system of a vehicle to a load during operation of the vehicle, the plurality of battery packs being configured to be selectively connected in parallel to the load. Based on at least an operational mode of the electric energy storage system and on the voltage of each one of the battery packs, and by allowing simultaneous connection of at least two battery packs to the load, proposing a connection sequence for electrically connecting at least a subset of the plurality of battery packs to the load. Prior to connecting at least the subset of battery packs to the load, and based on at least an internal resistance of each one of the battery packs within at least the subset of battery packs, determining whether the proposed connection sequence fulfils a predetermined connection condition.

A method of controlling fast charging of at least one battery pack within a high voltage electrical propulsion system includes identifying an operating condition, wherein the operating condition is one of charging mode and propulsion mode, and, when the electrical system is in charging mode, initiating charging of the at least one battery pack, terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is a request to terminate charging of the at least one battery pack, and terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is no request to terminate charging of the at least one battery pack and the charging of the at least one battery pack is complete.

A power control arrangement for a vehicle includes a bi-directional DC/DC converter and one or more controllers. The one or more controllers, after a request to activate the vehicle, command the bi-directional DC/DC converter to charge a DC link capacitor electrically between main contactors and the bi-directional DC/DC converter to target value without connecting a resistor in parallel with one of the main contactors and before closing all of the main contactors.

A redundant power source ECU detects for failure of a power source of a primary system from a first DC-to-DC converter. In cases in which a failure has been detected during autonomous driving, the redundant power source ECU performs control to cause operation by a sub battery of a predetermined secondary system component that draws an inrush current, regardless of whether or not operation has been requested.

The present application provides a protection circuit, high-voltage loop, electrical apparatus, control method, device and medium. The protection circuit comprises at least two auxiliary switch units, in a one-to-one association with at least two first control switch units; a semiconductor switch unit, connected to each first control switch unit, via an auxiliary switch unit corresponding to the first control switch unit; a control module; wherein the first control switch units are arranged on power transmission lines of a battery. According to embodiments of the present application, the electrical safety of a battery high-voltage loop can be improved.

An electric vehicle pre-charging circuit is provided. In one or more embodiments, the electric vehicle pre-charging circuit can comprise a first contactor located on a positive bus between a load and a battery. In various embodiments, the electric vehicle pre-charging circuit can comprise a second contactor located on a negative bus between the load and the battery. In further embodiments, the electric vehicle pre-charging circuit can comprise an on-board charger connected to the positive bus and the negative bus on a battery-side of the positive bus and a battery-side of the negative bus, wherein a phase wire connects the on-board charger to the positive bus on a load-side of the positive bus, and wherein a neutral wire connects the on-board charger to the negative bus on a load-side of the negative bus.

An electric vehicle charging system is provided. In some embodiments, the electric vehicle charging system can comprise an electric vehicle comprising a direct current to direct current (DC-DC) booster that boosts a first voltage to a second voltage of a battery of the electric vehicle, and a first insulation monitoring device (IMD) comprising an active symmetrization circuit. In various embodiments, the electric vehicle charging system can further comprise an electric vehicle supply equipment comprising a second IMD and an output voltage comprising the first voltage, wherein the first IMD is communicatively coupled to the second IMD, and wherein the first IMD adjusts a third voltage on a negative side of insulation resistance of the electric vehicle to a fourth voltage on a negative side of insulation resistance of the electric vehicle supply equipment.