An AC generation circuit includes a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor to the power storage in parallel by connecting a second end of the first capacitor and the first end of the second capacitor and connecting the first end of the first capacitor and a second end of the second capacitor in accordance with a first control signal, a series switch unit configured to connect the first capacitor and the second capacitor to the power storage in series by connecting the second end of the first capacitor and the second end of the second capacitor in accordance with a second control signal, and an inductor connected between both terminals of the series switch unit.

A temperature raising device includes an alternating current (AC) generation circuit including a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor to the power storage in parallel, and a series switch unit configured to connect the first capacitor and the second capacitor to the power storage in series, and a controller configured to alternately switch the state between a first state in which the parallel switch unit is in a conductive state and the series switch unit is in a non-conductive state and a second state in which the parallel switch unit is in the non-conductive state and the series switch unit is in the conductive state.

A temperature raising device includes an alternating current (AC) generation circuit including a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor to the power storage in parallel, and a series switch unit configured to connect the first capacitor and the second capacitor to the power storage in series, and a controller configured to alternately switch the state between a first state in which the parallel switch unit is in a conductive state and the series switch unit is in a non-conductive state and a second state in which the parallel switch unit is in the non-conductive state and the series switch unit is in the conductive state.

A method for equalizing SOCs of battery packs in an electric vehicle, may include acquiring, by a controller, SOC information of the battery packs from battery pack state information acquired by state detectors under predetermined conditions of the electric vehicle, determining, by the controller, an average SOC value of the battery packs based on acquired SOC values of the respective battery packs, determining, by the controller, at least one battery pack required to be discharged for equalization of the SOCs of the battery packs among all the battery packs based on the SOC values of the respective battery packs and the determined average SOC value of the battery packs, and operating, by the controller, an electric load connected to the at least one determined battery pack required to be discharged to discharge the at least one determined battery pack required to be discharged.

There is disclosed an electrical device and a method in which a battery is warmed up when operating from a sub-zero temperature. The electrical device may include a battery; an electrical storage element; and a battery management system including a controller in electrical communication with the battery and the electrical storage element. The controller can be configured to execute a program stored in the controller to shuttle energy between the battery and the electrical storage element until a power capability threshold of the battery has been reached, Shuttling the energy raises a temperature of the battery to meet power demand.

There is disclosed an electrical device and a method in which a battery is warmed up when operating from a sub-zero temperature. The electrical device may include a battery; an electrical storage element; and a battery management system including a controller in electrical communication with the battery and the electrical storage element. The controller can be configured to execute a program stored in the controller to shuttle energy between the battery and the electrical storage element until a power capability threshold of the battery has been reached, Shuttling the energy raises a temperature of the battery to meet power demand.

Provided is a charging controller that controls a process of charging a battery from an external power source. When an outside air temperature is equal to or lower than a predetermined temperature, the charging controller charges the battery from a time earlier than a scheduled time of use of the battery by a predetermined time until the scheduled time of use. Thus, even when the outside air temperature is equal to or lower than the predetermined temperature, the temperature of the battery has been raised by heat generated during the charging by the time of use of the battery.

Provided is a charging controller that controls a process of charging a battery from an external power source. When an outside air temperature is equal to or lower than a predetermined temperature, the charging controller charges the battery from a time earlier than a scheduled time of use of the battery by a predetermined time until the scheduled time of use. Thus, even when the outside air temperature is equal to or lower than the predetermined temperature, the temperature of the battery has been raised by heat generated during the charging by the time of use of the battery.

A battery pack includes a tray and a plate. The tray has an accommodating space. The accommodating space has a top opening. The plate is disposed at the top opening of the accommodating space. The plate includes an inner surface facing the accommodating space and an outer surface opposite to the inner surface. A plurality of cooling pipes sequentially arranged are disposed on the outer surface of the plate. A heating member is disposed between two adjacent cooling pipes.

A battery pack includes a tray and a plate. The tray has an accommodating space. The accommodating space has a top opening. The plate is disposed at the top opening of the accommodating space. The plate includes an inner surface facing the accommodating space and an outer surface opposite to the inner surface. A plurality of cooling pipes sequentially arranged are disposed on the outer surface of the plate. A heating member is disposed between two adjacent cooling pipes.