Electrical storage device and system for prime mover

The invention discloses a power storage device and system for a prime mover. The power storage device for the prime mover comprises a transmission part and an electrolytic power storage unit. The electrolytic power storage unit comprises a rotatable magnetic circuit and an annular electrolytic tank; the annular electrolytic tank is used for storing electrolyte; the cathode plate and the anode plate are provided with monitoring units; the rotatable magnetic circuit comprises a cylindrical magnet and one or more pairs of pole shoes which are fixedly connected to the upper end and the lower end of the magnet respectively; the magnet is arranged in an annular hole enclosed by the annular electrolytic tank, and each pair of pole shoes are respectively positioned on the upper surface and the lower surface of the annular electrolytic tank; the transmission part is driven by a prime motor to drive the rotatable magnetic circuit to rotate; rotation of the rotatable magnetic circuit generates an induced potential and a