Battery cell, manufacturing method and manufacturing system thereof, battery and electric device

The embodiment of the invention provides a battery monomer, a manufacturing method and a manufacturing system thereof, a battery and a power utilization device. The battery cell according to an embodiment of the present application comprises: a housing having an opening; the electrode assembly is accommodated in the shell, and the electrode assembly comprises a tab part; the end cover assembly comprises an end cover and an electrode terminal, the end cover is used for covering the opening, the electrode terminal is installed on the end cover, and the end cover is provided with a first through hole; the current collecting component is used for electrically connecting the electrode terminal and the tab part, the current collecting component comprises a first connecting part used for connecting the tab part, and the projection of the connecting area of the first connecting part and the tab part in the thickness direction of the end cover is at least partially overlapped with the projection of the first through hole in the thickness direction. According to the invention, impurities attached to the electrode assembly can be reduced in the assembly process, and the safety performance of the battery monomer is improved.