An ultracapacitor that contains a first electrode, second electrode, separator, nonaqueous electrolyte, and housing is provided. The first electrode comprises a first current collector electrically coupled to a first carbonaceous coating and the second electrode comprises a second current collector electrically coupled to a second carbonaceous coating. The nonaqueous electrolyte is in ionic contact with the first electrode and the second electrode, wherein the nonaqueous electrolyte contains an ionic liquid that is dissolved in a nonaqueous solvent at a concentration of about 1.0 mole per liter or more. The nonaqueous solvent has a boiling temperature of about 150° C. or more.

An ultracapacitor that contains a first electrode, second electrode, separator, nonaqueous electrolyte, and housing is provided. The first electrode comprises a first current collector electrically coupled to a first carbonaceous coating and the second electrode comprises a second current collector electrically coupled to a second carbonaceous coating. The nonaqueous electrolyte is in ionic contact with the first electrode and the second electrode, wherein the nonaqueous electrolyte contains an ionic liquid that is dissolved in a nonaqueous solvent at a concentration of about 1.0 mole per liter or more. The nonaqueous solvent has a boiling temperature of about 150° C. or more.

Systems and methods are disclosed herein to a power factor adjustor comprising: a power factor measurement unit configured to measure the power factor on an input line to a load and generate a power factor correction signal based on the measured power factor; and a power factor adjustment unit connected to the power factor measurement unit comprising: a fixed capacitor connected in series to a first switching device; and an adjustable element having a variable capacitance connected in parallel to the fixed capacitor and in series to a second switching device, wherein the overall capacitance of the power factor adjustment unit is adjusted by adjusting the capacitance of the adjustable element or by toggling the first and second switching devices in response to the power factor correction signal.

Systems and methods are disclosed herein to a power factor adjustor comprising: a power factor measurement unit configured to measure the power factor on an input line to a load and generate a power factor correction signal based on the measured power factor; and a power factor adjustment unit connected to the power factor measurement unit comprising: a fixed capacitor connected in series to a first switching device; and an adjustable element having a variable capacitance connected in parallel to the fixed capacitor and in series to a second switching device, wherein the overall capacitance of the power factor adjustment unit is adjusted by adjusting the capacitance of the adjustable element or by toggling the first and second switching devices in response to the power factor correction signal.

A power supply device comprises a lead-acid battery disposing a plurality of cells in a battery case of a rectangular parallelepiped shape having a pair of facing walls and a pair of end surface walls at the circumference of a rectangular bottom surface plate, and a power storage device connected in parallel to the lead-acid battery. The power storage device has a larger storage capacity by regenerative braking than that of the lead-acid battery, and the power storage device has an external case having a heat radiation plate disposed in a thermally connected state to the facing wall of the lead-acid battery, and the heat radiation plate is thermally connected to the facing wall of the lead-acid battery.

A power supply device comprises a lead-acid battery disposing a plurality of cells in a battery case of a rectangular parallelepiped shape having a pair of facing walls and a pair of end surface walls at the circumference of a rectangular bottom surface plate, and a power storage device connected in parallel to the lead-acid battery. The power storage device has a larger storage capacity by regenerative braking than that of the lead-acid battery, and the power storage device has an external case having a heat radiation plate disposed in a thermally connected state to the facing wall of the lead-acid battery, and the heat radiation plate is thermally connected to the facing wall of the lead-acid battery.

An energy storage device having improved heat-dissipating includes a cell assembly formed by connecting at least two cylindrical energy storage cells in series, a case having an accommodation portion shaped corresponding to an outer surface of the energy storage cells to accommodate the cell assembly, and a heat-dissipating pad installed between an outer surface of the energy storage cells of the cell assembly and an inner surface of the accommodation portion, wherein the case includes at least two case blocks, and wherein the accommodation portion is formed by coupling the case blocks.

An energy storage device having improved heat-dissipating includes a cell assembly formed by connecting at least two cylindrical energy storage cells in series, a case having an accommodation portion shaped corresponding to an outer surface of the energy storage cells to accommodate the cell assembly, and a heat-dissipating pad installed between an outer surface of the energy storage cells of the cell assembly and an inner surface of the accommodation portion, wherein the case includes at least two case blocks, and wherein the accommodation portion is formed by coupling the case blocks.

The present disclosure generally relates to a venting system that includes a wall of a lid or a container, the lid or container defining a central longitudinal axis, and a line segment that is measured from the longitudinal axis to an outermost surface of the lid or container, and a pressure relief feature that is disposed along the lid or container. The pressure relief feature includes a thinned region of the lid or container that defines a minimum thickness that is less than 40% of a maximum thickness of the respective lid or container. The pressure relief feature extends at least 180 degrees about the longitudinal axis, and the pressure relief feature is located at a distance from the longitudinal axis of more than 80% of the line segment.

An energy storage apparatus includes: a plurality of energy storage devices; a spacer unit having one or more spacers disposed between the energy storage devices or on sides of the energy storage devices; and a plurality of members disposed above the energy storage devices and the spacer unit (a bus bar frame, a heat shielding plate, a holder), wherein the spacer unit has a plurality of locking portions, the locking portions being configured to lock the members, respectively.