METHOD FOR JOINING EXTERNAL TABS OF ANODE ELECTRODES TO A NEGATIVE BATTERY TAB

A battery cell comprising A anode electrodes, C cathode electrodes, and S separators. The A anode electrodes and the A external tabs include a metal layer including lithium metal forming both an anode active material layer and an anode current collector. The A anode electrodes, the C cathode electrodes, and the S separators are arranged in a predetermined order adjacent to one another, where A, C, and S are integers greater than one. The battery cell includes A external tabs extending from the A anode electrodes, a negative battery tab including nickel, a copper strip arranged around the A external tabs of the A anode electrodes in a direction transverse to a longitudinal direction of the negative battery tab. One end of the negative battery tab is ultrasonically welded to the copper strip and the external tabs of the A anode electrodes.