Abstract: An energy storage tank having a function of fixing energy storage units used for a working liquid includes a fixing assembly and a tank body that is for filling of the working liquid and has a bottom plate. The fixing assembly is received in the tank body and includes a fixing part to which the energy storage units are connected and an installation part that is fixed at the fixing part and disposed on the bottom plate. The installation part and the fixing part hold the energy storage units completely in the working liquid. Therefore, the energy storage units are fixed in the tank body in series or by group and distributed evenly in the working liquid such that each of the energy storage units can completely contact the working liquid to enhance energy storage efficiency of the energy storage tank.

Abstract: An energy storage element of an energy storage assembly includes a cylindrical body and a channel formed in an axial direction in an internal thereof; wherein the cylindrical body includes an energy storage material. With the energy storage element having a cylindrical body, the shape of the energy storage element is of the merit of low hydraulic resistance, which allows air flow to pass through the energy storage element(s) smoothly at great speed.