A secondary battery includes an electrode wound body including a positive electrode and a negative electrode, and includes an electrolytic solution. The positive electrode includes a positive electrode covered part and a positive electrode exposed part. The negative electrode includes a negative electrode covered part and a negative electrode exposed part. First edge parts of the positive electrode exposed part that is wound, second edge parts of the negative electrode exposed part that is wound, or both are bent toward a central axis to overlap each other, the first edge parts being adjacent to each other in a radial direction of the electrode wound body, the second edge parts being adjacent to each other in the radial direction. The electrolytic solution includes LiPF.sub.6 as an electrolyte salt. A concentration of the electrolyte salt in the electrolytic solution is within a range from 1.25 mol/kg to 1.45 mol/kg both inclusive.

A method of and system for operating a hybrid electric propulsion system for an aircraft in a start sequence is provided. The hybrid electric propulsion system includes a thermal engine, an electric motor, a gearbox, an electric power storage unit, and a propulsion unit having a propeller having propeller blades. The method includes: driving the propeller from a static state to a target rotational speed within a predetermined range of speeds using the electric motor; transitioning the propeller blades from a feathered mode to an unfeathered mode while the propeller is being driven at the target rotational speed solely by the electric motor; starting the thermal engine; and transitioning the driving of the propeller using the electric motor to driving the propeller using the thermal engine.

A voltage supply device for supplying DC voltage generated by a power generation unit to a load, including: a voltage acquisition unit that acquires a first voltage that is the voltage of a smoothing capacitor and a second voltage that is the voltage of a battery; a computation unit that computes the difference between the first voltage and the second voltage; a judgment unit that judges that the smoothing capacitor is in an overvoltage state when the difference is no less than a predetermined threshold; and a power generation control unit that controls the power generation unit to suppress or stop power generation by the power generation unit when the smoothing capacitor is in an overvoltage state.

An electric vehicle propulsion system includes an electric motor and a battery pack formed as a single, integrated unit. It is a self-contained, integrated electric propulsion system. It disrupts the long-established engineering paradigm that the electric motor and the battery pack have to be designed, built and installed as separate systems.

An electric vehicle propulsion system includes an electric motor and a battery pack formed as a single, integrated unit. It is a self-contained, integrated electric propulsion system. It disrupts the long-established engineering paradigm that the electric motor and the battery pack have to be designed, built and installed as separate systems.

An electric power system of a flying object may supply power to electric loads including a VTOL motor and a cruise motor. A control device includes an acquisition unit, a determination unit that determines whether a power surplus situation in which surplus power obtained by deducting the required power from the sum of the generated power and the regenerated power is larger than the maximum allowable power is brought about, and a control unit that can execute power consumption increase control for increasing power consumption by reducing the operation efficiency of the cruise motor in the power surplus situation.

An electric power system of a flying object may supply power to electric loads including a VTOL motor and a cruise motor. A control device includes an acquisition unit, a determination unit that determines whether a power surplus situation in which surplus power obtained by deducting the required power from the sum of the generated power and the regenerated power is larger than the maximum allowable power is brought about, and a control unit that can execute power consumption increase control for increasing power consumption by reducing the operation efficiency of the cruise motor in the power surplus situation.

A control device includes an acquisition unit configured to acquire information indicating a battery output limit value that is a maximum value of electric power that can be supplied from a battery to an electric load, and a control unit configured to, when electric power supplied from a first battery to a first electric load is expected to exceed a first battery output limit value, execute control of increasing electric power supplied from a battery other than the first battery and reducing electric power supplied from the first battery to the first electric load.

A control device includes an acquisition unit configured to acquire information indicating a battery output limit value that is a maximum value of electric power that can be supplied from a battery to an electric load, and a control unit configured to, when electric power supplied from a first battery to a first electric load is expected to exceed a first battery output limit value, execute control of increasing electric power supplied from a battery other than the first battery and reducing electric power supplied from the first battery to the first electric load.

A moving object includes equipment disposed in a first area and including an engine and a power generator driven by the engine, equipment disposed in a second area located forward of the first area in a traveling direction of the moving object and including an electric power device supplying electric power from the power generator to a battery, and equipment disposed in a third area located forward of the second area in the traveling direction and including the battery.