Mechanically driven storage tank for compressed carbon dioxide energy storage system

The utility model discloses a mechanical drive type storage tank for a compressed carbon dioxide energy storage system, which is characterized in that an end cover is arranged at one end of an opening of a tank body, and the inner side surface of the end cover and the inner wall of the tank body form a first closed cavity; a piston is movably mounted in the first closed chamber and divides the first closed chamber into a second closed chamber and a third closed chamber; the second closed chamber is provided with a first liquid inlet and a first liquid outlet, and the third closed chamber is provided with a second liquid inlet and a second liquid outlet; each liquid inlet/outlet is fixedly connected with the corresponding connecting pipe; piston rods are fixedly mounted on the pistons; the part, close to the free end, of the piston rod is of a gear rod structure. The reciprocating motion of the piston is used for driving the liquid carbon dioxide in the storage tank to be discharged and discharged, the working