A motorization kit for a storage system with mobile cabinets sliding along support guides, characterized in that it comprises a box-like body which is designed to be fixed to a lateral side of a mobile cabinet to be moved and in that it further comprises: - an electric motor held within said box-like body; - a driven pinion held in said box-like body and designed to be keyed to the drive shank of a mobile cabinet to be moved, - mechanical drive means supported in said box-like body, said drive means kinematically rotatably connecting the rotating shaft of said electric motor and said driven pinion, to transfer the torque of said motor to said driven pinion; - electronic adjustment and control means for managing the operation of said motor, which are held within the box-like body; - actuation means supported by said box-like body for providing an enable signal to said electronic adjustment and control means, for rotary actuation of said motor in a predetermined direction of rotation; - safety means supported by said box-like body, for causing said motor to stop in response to a signal emitted as an obstacle is found along the path of the mobile cabinet with the motorization kit fixed thereto; - first sensor means (13, 14) for detecting contiguous cabinets/control devices kits, and for adjusting or stopping the operation of said motor according to the distance from a contiguous cabinet/motorization kit detected by said first sensor means and - storage batteries held within said box-like body for powering said electric motor, said electronic. adjustment and control means, said actuation means, said safety means and said first sensor means (13, 14), wherein said box-like body has no external wiring means for permanent connection to the mains and/or other motorization kits and wherein said first sensor means include proximity sensor means for detecting the distance of said motorization kit from a cabinet/motorization kit next to it, to cause a reduction of the rotation speed of said motor to a value greater than zero, when said detected distance is lower than a preset threshold value. - an electric motor held within said box-like body; - a driven pinion held in said box-like body and designed to be keyed to the drive shank of a mobile cabinet to be moved, - mechanical drive means supported in said box-like body, said drive means kinematically rotatably connecting the rotating shaft of said electric motor and said driven pinion, to transfer the torque of said motor to said driven pinion; - electronic adjustment and control means for managing the operation of said motor, which are held within the box-like body; - actuation means supported by said box-like body for providing an enable signal to said electronic adjustment and control means, for rotary actuation of said motor in a predetermined direction of rotation; - safety means supported by said box-like body, for causing said motor to stop in response to a signal emitted as an obstacle is found along the path of the mobile cabinet with the motorization kit fixed thereto; - first sensor means (13, 14) for detecting contiguous cabinets/control devices kits, and for adjusting or stopping the operation of said motor according to the distance from a contiguous cabinet/motorization kit detected by said first sensor means and - storage batteries held within said box-like body for powering said electric motor, said electronic. adjustment and control means, said actuation means, said safety means and said first sensor means (13, 14),