BATTERY CELL COMPRISING UNIT CELLS HAVING DIFFERENT ELECTRODE STRUCTURES

摘要

Stacked structure unit cells comprising a positive electrode and a negative electrode where an active material is spread on both surfaces of a current collector, and a separation film interposed between the positive electrode and the negative electrode; and an electrode assembly including a separation film consecutively winding the unit cells are installed in a storage unit of a battery case. The electrode assembly locates n odd numbered unit cells on a separation film having the relatively long length to the width, and winds from a first unit cell to a n^th unit cell sequentially to locate the first unit cell at the center of the electrode assembly around a stacked direction, and a (n-1)^th unit cell and the n^th unit cell respectively at the outermost of the electrode assembly. The first unit cell and the n^th unit cell have a structure in which electrodes having the different polarity are located on both ends of the unit cells, and other unit cells respectively and independently have a structure in which electrodes having the same polarity are located on both ends of the unit cells.