A vehicle includes a battery, an electric power acquirer, a power supply unit, first and second relays, and a controller. The first relay connects and disconnects the battery to and from a power supply line. The second relay connects and disconnects the electric power acquirer to and from the power supply line. The controller executes a first switching control including switching the second relay to a connected state with the first relay kept in a connected state. In the switching of the second relay to the connected state in the first switching control, the controller reduces a difference between a potential of the second relay on the side on which the electric power acquirer is disposed and a potential of the second relay on the side on which the battery is disposed, using electric power inputted from the electric power acquirer.

An electrically powered vehicle system includes a DC/DC converter stage with a rectified input terminal which receives a rectified input from an AC power input. The system also includes a vehicle battery which receives power output from the DC/DC converter stage, via a first link between the rectified input terminal and the DC/DC converter stage. A second link is connected to the first link and to a vehicle device.

An electrically powered vehicle system includes a DC/DC converter stage with a rectified input terminal which receives a rectified input from an AC power input. The system also includes a vehicle battery which receives power output from the DC/DC converter stage, via a first link between the rectified input terminal and the DC/DC converter stage. A second link is connected to the first link and to a vehicle device.

A vehicle electrical system including a battery, the terminals of which supply positive and negative power rails, the battery being connected to one or more vehicle devices to supply power or charging thereto. The devices include capacitors. The system also includes at least one heating device and a switch to allow capacitor discharge to flow through the heating device.

A vehicle electrical system including a battery, the terminals of which supply positive and negative power rails, the battery being connected to one or more vehicle devices to supply power or charging thereto. The devices include capacitors. The system also includes at least one heating device and a switch to allow capacitor discharge to flow through the heating device.

Provided is a plug-in hybrid vehicle which includes an exhaust treatment unit which communicates with an engine and discharges exhaust gas generated by combustion of liquid fuel, an oxidation catalyst and an SCR which are placed in a middle part of the exhaust treatment unit to remove impurities contained in the exhaust gas, and an external charging mechanism which is electrically connected with a battery and charges the battery with external electrical power, where the external charging mechanism includes a first heater unit and a second heater unit which heat the oxidation catalyst and the SCR with electrical power stored in the battery or external electrical power when the battery is charged with the external electrical power in a state where the fuel-based power unit and the electrical power unit are stopped.

A method for charging a battery at a low temperature in a battery system is provided. The system includes a charger that provides power for charging the battery and a temperature-increasing device that generates heat using the power provided from the charger to increase a temperature of the battery.

A relay diagnosis circuit capable of diagnosing whether a relay connected to a negative electrode of a battery pack normally operates using voltage applied from a positive electrode of the battery pack.

A plug-in connector part for connection to a mating plug-in connector part includes: a housing which has a plug-in portion for plug-in connection to the mating plug-in connector part; at least one contact element arranged on the plug-in portion and for electrically contacting an associated mating contact element of the mating plug-in connector part; a thermal conductor line connected to the at least one contact element; and a cooling body arranged in the housing and thermoconductively connected to the at least one contact element via the thermal conductor line in order to dissipate heat from the at least one contact element.

A plug-in connector part for connection to a mating plug-in connector part includes: a housing which has a plug-in portion for plug-in connection to the mating plug-in connector part; at least one contact element arranged on the plug-in portion and for electrically contacting an associated mating contact element of the mating plug-in connector part; a thermal conductor line connected to the at least one contact element; and a cooling body arranged in the housing and thermoconductively connected to the at least one contact element via the thermal conductor line in order to dissipate heat from the at least one contact element.