An electric power storage device, including a protective cover configured to protect from impact and including an electric carbon fiber component, the electric carbon fiber component incorporating a structural battery, the structural battery including energy storage devices. The energy storage devices are suitable for energy storage and structural support for the electric carbon fiber component. Each of the energy storage devices having an anode core of a continuous carbon fiber, an electrolyte arranged on the continuous carbon fiber core, and a cathode layer arranged to the at least one continuous carbon fiber core on the electrolyte, and an interface terminal electrically connected to the structural battery, the interface terminal for outputting power from the structural battery.