Provided is a stirring apparatus that can drive a stirring body with a simple structure and without applying excessive force. The stirring apparatus is provided with: the stirring body, which is a two-circle roller having an axis of rotation and two stirring fins; first and second drive shafts with axial centers not matching the axis rotation; a first shaft coupling, which connects the first drive shaft on a first stirring fin side of the axis rotation; a second shaft coupling, which connects the second drive shaft on a second stirring fin side of the axis of rotation; and a driving unit that exclusively carries out rotary drive of only either of the first and second drive shafts. The driving unit is provided with a regulating member that makes a teeth angular range of a first gear face a power-driven gear without play at a rotary position where the boundary between the teeth angular range and a missing teeth angular range of the first gear faces the power-driven gear and makes a teeth angular range of a second gear face the power-driven gear without backlash at a rotary position where the boundary between the teeth angular range and a missing teeth angular range of the second gear faces the power-driven gear.

Disclosed is a processing device for a lithium battery positive electrode material, including a base, where the base is fixedly provided with barrel bodies by means of a support, a sleeve is rotatably clamped between the two barrel bodies, a stirring assembly transversely penetrates through interiors of the barrel bodies and the sleeve, the base is further provided with a power mechanism, and the power mechanism separately drives the sleeve and the stirring assembly to rotate. Due to the cooperation of the barrel bodies, the sleeve and the stirring assembly, the stirring assembly can effectively scrape attachments on the inner walls of the barrel bodies, and a first stirring blade in the sleeve and a second stirring blade in the stirring assembly are cooperated to stir, gather and further disperse and disarrange the material, such that the material can be mixed more uniformly.

A fluid mixing system includes a flexible bag having a first end, an opposing second end, and an interior surface bounding a compartment; a retainer coupled to the second end of the flexible bag, the retainer having a retention cavity formed thereon that communicates with the compartment of the flexible bag; and an elongated member having a first end rotatably coupled to the first end of the flexible bag and an opposing second end freely disposed within the retention cavity of the retainer so that the second end of the elongated member can rotate within the retention cavity relative to the retainer.