A secondary battery with a finishing tape preventing air bubbles from
being formed between a jelly roll electrode structure and the finishing
tape. The secondary battery includes a wound electrode assembly having a
positive electrode sheet, a separator, and a negative electrode sheet,
sequentially stacked, and a finishing tape having penetrating holes and
adhered to the outer lateral surface of the wound electrode assembly. The
penetrating holes permit air to escape, preventing the formation of air
bubbles under the tape. The secondary battery may be made by sequentially
stacking a positive electrode sheet, a separator, and a negative
electrode sheet to form an electrode structure, adhering a finishing tape
to a surface of one of the positive and negative electrode sheets of the
electrode structure, the finishing tape including penetrating holes,
applying tension to a free end of the finishing tape and winding the
electrode structure in a spiral with the finishing tape covering and
adhered to the electrode structure as an outside surface, whereby air
trapped between the electrode structure and the finishing tape during
winding passes through the penetrating holes, preventing formation of air
bubbles between the finishing tape and the electrode structure.
Alternatively, the secondary battery may be made by sequentially stacking
a positive electrode sheet, a separator, and a negative electrode sheet
to form an electrode structure, winding the electrode structure in a
spiral having an outside surface, and adhering a finishing tape including
penetrating holes to the outside surface by winding the tape around the
spiral, covering the outside surface and adhering the finishing tape to
itself, so that air trapped between the electrode structure and the
finishing tape during winding passes through the penetrating holes,
preventing formation of air bubbles between the finishing tape and the
electrode structure.