BATTERY CELL, METHOD AND SYSTEM FOR MANUFACTURING A BATTERY CELL, BATTERY AND ELECTRIC DEVICE

The embodiments of the present application provide a battery cell, a method and system for manufacturing a battery cell, a battery and an electrical device. The battery cell includes: an electrode assembly, including a first tab and a second tab with opposite polarities; a casing for accommodating the electrode assembly, wherein the casing includes a cylinder body and a cover body connected to the cylinder body, the cylinder body is disposed around an outer periphery of the electrode assembly, the cover body is provided with an electrode lead-out hole, and at least part of the cover body is used for electrically connecting a first connecting member of the battery and the first tab; and an electrode terminal for electrically connecting a second connecting member of the battery and the second tab, wherein the electrode terminal is disposed at the cover body in an insulating manner and installed at the electrode lead-out hole, one of the cover body and the electrode terminal is a positive output pole of the battery cell, and the other is a negative output pole of the battery cell. The present application can improve an ability of allowing current to pass through of the battery cell and simplify a structure of the battery cell.