The invention discloses a charging and discharging control and management method and device for SC-Li-SC
hybrid energy storage, and belongs to the field of
hybrid energy storage. The device comprisessuper capacitors, a rechargeable battery, a
voltage stabilizing device, a
current sensor, and a controller. The method comprises a method of
smoothing charging power with strong randomness and large fluctuation amplitude, a method of judging whether a single super
capacitor finishes charging the rechargeable battery, a method of switching the super capacitors to enable the super capacitors to performing charging and discharging efficiently, and a method of realizing the approximate
voltage-stabilizing discharging of the rechargeable battery. The
current sensor is used for detecting the currentwhen the super capacitors charge the rechargeable battery; the controller controls the working states of the super
capacitor SC1 and the super
capacitor SC2 according to the current between the supercapacitors and the rechargeable battery. According to the charging and discharging control and management method and device of the invention, through a corresponding control strategy, a whole hybridenergy storage device can stably and safely
charge and discharge energy under the conditions of unstable
new energy generation power and large fluctuation amplitude by utilizing respective performanceadvantages of the super capacitors and the rechargeable battery.