Busbar for battery cell module, battery cell module and manufacturing method of battery cell module

The invention discloses a busbar for a battery cell module, the battery cell module and a manufacturing method thereof, the busbar for the battery cell module comprises a plurality of confluence single bodies which are sequentially connected to form a sheet-shaped confluence body, each confluence single body comprises a plate body, at least one rectangular containing groove is formed in each plate body, welding brazing filler metal is arranged in each rectangular containing groove, and the welding brazing filler metal is arranged in each rectangular containing groove. And the welding brazing filler metal is higher than the surface of the plate body. When the busbar and the battery cell module are welded and connected, the welding efficiency is high, the welding spot positions of the battery cell and the busbar are determined, all the welding brazing filler metal is melted after the electric soldering iron is in contact with all the welding positions at the same time according to the welding spot positions, an