The invention provides a positioning and fixing device before
gasket placement and a tab positioning and fixing method before
gasket placement. The positioning and fixing device before
gasket placement comprises a bottom plate, a
rotating disc, a top plate, a first rotating driving piece, a plurality of die sleeves, a tab positioning mechanism and a
battery cell protection mechanism, the
battery cell protection mechanism comprises a first lifting driving piece and an ejector rod, and the tab positioning mechanism comprises a rotating
assembly and a positioning detection
assembly. Specifically, a first lifting driving piece drives an ejector rod to move upwards, so that the end part of the ejector rod penetrates through a receding hole to abut against the bottom of the
battery cell, the battery
cell is driven to move downwards together in a die sleeve, and the acting force generated when the battery
cell is in contact with the bottom wall of a containing groove is reduced; the rotating
assembly drives the die sleeve to rotate, and when the tab on the battery
cell rotates to be opposite to the positioning detection piece, the positioning detection piece releases a
signal to enable the rotating assembly to stop rotating, so that positioning of the tab is completed, and the problem of tab bending caused by contact between the gasket and the tab is avoided.