A power supply device is mountable to a vehicle and includes: a high-voltage battery; a low-voltage battery of which an output voltage is lower than that of the high-voltage battery, and which can be charged by output power from the high-voltage battery; and a control unit configured to perform charging/discharging control for the high-voltage battery and the low-voltage battery. The control unit performs feeding control for causing the high-voltage battery to supply power to a predetermined on-vehicle device while consumed power is higher than a predetermined value in a state in which a main switch of the vehicle is not on.

The disclosure provides an electric energy storage device which includes four energy units with a substantially same voltage value. Each energy unit is provided with a positive electrode and a negative electrode. The electric energy storage device comprises a socket with eight independently arranged electrode terminals that are connected with the four energy units. The disclosure also provides an electric tool system using the electric energy storage device. The electric tool is provided with plugs that may be connected with the four energy units in different states, allowing the electric energy storage device to output multiple voltages.

Electrical circuit arrangement for an energy storage system comprising a first electrochemical energy storage device and a second electrochemical energy storage device.

A battery pack system and methods for operating the battery pack system are disclosed. In one example, the battery pack system may simultaneously output two different voltages from a stack of battery cells. One voltage may be applied to a first group of electric power consumers and the second voltage may be applied to a second group of electric power consumers.

A system includes a first bus, a second bus, a first battery that includes a first plurality of cells, and a second battery that includes a second plurality of cells, wherein the second battery is connected to the second bus. A first converter connects the first battery to the first bus. A second converter connects the first bus to the second bus. A controller is configured to control operation of the first converter and the second converter.

A power distribution includes first and second inputs, first and second outputs, and a third output configured to connect to a low-voltage vehicle power supply, a high-voltage distributor is connected to the first input and forms the connection between the energy storage and further components of the power distribution. A controller monitors at least the high-voltage distributor and can control components of the power distribution. At least one inverter is arranged in the current path between the high-voltage distributor and at least one of the contacts for the first output, the second output or the second input, a first converter is arranged between the high-voltage distributor and the third output and converts a DC voltage provided by the high-voltage distributor to a lower DC voltage.

An electronic device includes a power supply unit and a main body unit. The power supply unit converts electric power supplied from an external power supply to a DC voltage of a first voltage value to output the voltage to the main body unit and changes, in a case where power supply from the external power supply has been cut off, a value of the DC voltage that it outputs to a second voltage value that is different from the first voltage value. The main body unit executes predetermined termination processing in a case where the value of the DC voltage output by the power supply unit has changed to the second voltage value.

An off-road vehicle includes a vehicle body, a power system, electrical devices, an electricity storage bank, a generator, and an electric power regulator. The electric power regulator is used to regulate the voltage output from the generator to the electricity storage bank and corresponds to the electricity storage bank. The electric power regulator includes a voltage regulating chip, a switch circuit and voltage stabilizing circuit. The electric power regulator is capable of regulating the voltage output from the generator to the electricity storage bank according to the nominal voltage of the electricity storage bank, and the output voltage of the electric power regulator is greater than the bank voltage.

An electronic device includes a first voltage conversion unit, a second voltage conversion unit, and a control unit. The first voltage conversion unit generates a first voltage from power supplied from a first power supply or a second power supply. The second voltage conversion unit generates a second voltage, which is lower than the first voltage, from power supplied from the first power supply or the second power supply. The control unit controls a process of supplying power, supplied from the first power supply, to the first voltage conversion unit and a process of supplying power, supplied from the second power supply, to the second voltage conversion unit, in a case where a predetermined condition is satisfied.

A system includes a first bus, a second bus, a first battery that includes a first plurality of cells, and a second battery that includes a second plurality of cells, wherein the second battery is connected to the second bus. A first converter connects the first battery to the first bus. A second converter connects the first bus to the second bus. A controller is configured to control operation of the first converter and the second converter.