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

Embodiments of this application provide a battery cell (20), a battery (100), an electric device, a manufacturing method of battery cell, and a manufacturing device (2000) of battery cell, and relate to the field of battery technologies. The battery cell (20) includes a housing (21), an electrode assembly (22), an end cover (23), and a current collecting member (24). The housing (21) has an opening, the electrode assembly (22) has tabs (221), the electrode assembly (22) is configured to be accommodated in the housing (21), the end cover (23) is configured to cover the opening, and the current collecting member (24) is configured to connect the end cover (23) to the tab (221) to implement electrical connection between the end cover (23) and the tab (221). The current collecting member (24) is welded to the tab (221) to form a first welded portion (25) and a second welded portion (26), the current collecting member (24) is welded to the end cover (23) to form a third welded portion (27), the first welded portion (25) is on an inner peripheral side of the third welded portion (27), and the second welded portion (26) is on an outer peripheral side of the third welded portion (27). The battery cell (20) with such structure can equalize movement paths of electrons in an inner ring part and an outer ring part of the electrode assembly (22), thereby reducing internal resistance of the battery cell (20) and effectively prolonging service life of the battery cell (20).