TAB WELDING MECHANISM AND BATTERY ASSEMBLY SYSTEM

A tab welding mechanism comprises a base platform, a support base, a tab pressing structure, and a welding assembly. The support base is provided on the base platform and is used for supporting and fixing a cell body of a battery cell; the tab pressing structure is provided on the base platform and is configured to be capable of moving toward the support base, so as to press and gather a plurality of laminated tab pieces of the battery cell; and the welding assembly is provided on the base platform and is configured to be capable of moving toward the support base, so as to weld the plurality of gathered tab pieces to form a tab portion.