Battery stack automatic assembly system and assembly method

The invention relates to the technical field of battery stacking, in particular to a battery stacking automatic assembly system which is provided with a first-section line body, a second-section line body and a third-section line body and further comprises a plurality of grabbing positions arranged on the first-section line body. The shuttling table is arranged between the first-section line body and the second-section line body and is used for grouping the single battery cells in pairs; the second-section tray is arranged on the second-section line body; the rubberizing position, the release paper tearing position, the rubberizing detection position and the pre-stacking position are sequentially arranged beside the second-section line body in the conveying direction of the second-section line body; the three-section tray is arranged on the three-section line body; the tray loosening and tightening device is arranged beside the three-section tray and used for loosening and tightening the movable end of the th