Removable electric propulsion system for a rolling object with a device for releasing the handlebar

A removable electric propulsion system for a rolling object (13), said propulsion system (1) comprising a frame (2) provided with at least one wheel (3) driven by an electric machine (10), and at least one non-driven wheel (4), a handlebar (20) and means (5) for coupling said propulsion system to said rolling object (13), said coupling means (5) comprising means for gripping and lifting at least one wheel of said rolling object (13), said handlebar (20) comprising a connection with said frame (2) and/or said driven wheel (3), characterized in that said connection comprises a means (12, 40) for locking/unlocking said handlebar (20) relative to said frame (2) and/or to a driven wheel (3) from at least one locking position where handlebar (20) is attached to said frame (2) and/or to said driven wheel (3), this at least one locking position (22′) of said handlebar (20) enabling electric propulsion system (1) to be moved by means of said handlebar (20), to an unlocking position (22″) enabling at least free motion of said handlebar (20) relative to said frame (2) or to said driven wheel (3).