A vehicle control apparatus capable of protecting a pre-charge circuit is provided. When a voltage has entered an operating voltage range, a microcomputer determines whether a preset period has elapsed from then. Upon determining that the preset period has elapsed, the microcomputer starts initial check. To carry out the initial check, the microcomputer starts charging a capacitor for power supply stabilization of a drive circuit by turning on the pre-charge circuit and, when the charging of the capacitor is completed, turns on a power supply relay provided on a power supply line that connects between a battery and the drive circuit.

An electric vehicle charging system includes an interleaved DC-DC control system configured to facilitate providing electric charge to an electric vehicle battery and includes a controller communicatively coupled to the interleaved DC-DC control system. The interleaved DC-DC control system includes an inrush current limiting circuit, three parallel boost converters that are each configured to operate in a discrete phase, and unidirectional current circuitry. The controller includes electronic control circuitry configured to control the interleaved DC-DC control system and vehicle communication circuitry configured to establish charging protocols between the interleaved DC-DC control system and the electric vehicle battery.

An FET makes an upstream power supply circuit an energized state and makes the upstream power supply circuit an interrupted state. An FET makes a downstream power supply circuit an energized state and makes the downstream power supply circuit an interrupted state. An FET turns on to make an anode and a cathode of the capacitor an energized state, and turns off to make the anode and the cathode an interrupted state. A controller turns on the FET and the FET and turns off the FET to make a power supply circuit an energized state. When a certain discharge request is input in the energized state of the power supply circuit, the controller turns off the FET and turns on the FET and the FET. With this configuration, a semiconductor relay device can appropriately address the power supply circuit at the time of abnormality.

A power relay assembly for an electric vehicle and a driving method thereof according to an embodiment of the present invention connect the first switching unit and the second switching unit connected in series with each other in parallel with the relay switch, and by allowing the first switching unit and the second switching unit to include semiconductor switching elements and diodes therein, not only when power is supplied from the battery to the load side, but also when charging is performed by supplying a charging current to the battery, it is possible to supply or cut off power while preventing sparks and arcs at the relay contact point.

A DC voltage source, for example an AC/DC converter, has an output producing a controllable DC voltage for a DC charging station to charge the battery of an electric vehicle. A voltage balancing unit is connected between the output of the converter and the output terminal of the DC charging station. The voltage balancing unit has a controllable switch by which the connection between voltage source or converter and battery can be made or broken as desired. The switch is controlled as a function of the voltage on the input and output side of the voltage balancing unit to the effect that the switch breaks the connection before and while the battery is being connected to the DC output terminal, and makes a connection only when the voltage on the input side of the voltage balancing unit corresponds substantially to the voltage on the output side of the voltage balancing unit.

Embodiments of the present application provides a method for pre-charging a power conversion device and a power conversion device. The power conversion device is configured to perform power conversion between a charging pile and a traction battery, and the method includes: receiving, by the power conversion device, a first message sent by a battery management system of the traction battery, and the first message is configured to indicate that the battery management system is ready for charging; performing, by the power conversion device, a pre-charging, and the pre-charging includes: charging a capacitor in the power conversion device; and forwarding, by the power conversion device, the first message to the charging pile after the pre-charging is completed. The technical solution of the embodiments of the present application can ensure a normal charging process.

Embodiments of the present application provide a pre-charging method of a power conversion device and a power conversion device. The power conversion device is used for a power conversion between a charging pile and a power battery and the method includes: receiving, by the power conversion device, a first message transmitted by a battery management system of the power battery, where the first message is used to indicate a charging readiness of the battery management system; and forwarding, by the power conversion device, the first message to the charging pile and performing a pre-charging, where the pre-charging includes charging a capacitor in the power conversion device. The technical solution in embodiments of the present application is capable of ensuring normal performing of a charging process.

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 a target value without connecting a resistor in parallel with one of the main contactors and before closing all of the main contactors.

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.

An electrochemical apparatus includes a battery group, a main supply loop, a pre-charging circuit, and a control module. The pre-charging circuit includes a first switch and a thermo-sensitive element. The thermo-sensitive element is configured to electrically connect the first switch, and impedance of the thermo-sensitive element increases with a rise in temperature. The first switch is electrically connected to the control module and the main supply loop, the thermo-sensitive element is electrically connected to the first switch, and the control module is configured to control the first switch to close to turn on the pre-charging circuit. When the pre-charging circuit meets a preset condition, the control module controls the first switch to open to turn off the pre-charging circuit. This application further provides an electrical apparatus, an electric vehicle, and a power supply control method for an electrochemical apparatus.