Patent ID: 7906233

Claim:
A lithium ion secondary battery, comprising: one or more plate-shaped positive electrodes; a belt-shaped separator strip; one or more plate-shaped negative electrodes; electrolyte; and a battery shell; wherein an electrode core having two sides is formed by first wrapping one of said positive electrodes or negative electrodes with said separator strip, stacking on each side of said electrode core with one of said electrodes having a polarity opposite to the polarity of the electrode out-most of the electrode core further adding to the electrode core, and wrapping said electrode core with said separator strip, and repeating the stacking step and wrapping step until a pre-determined number of said electrodes are used; and wherein said electrode core and said electrolyte are placed in said battery shell and wherein said separator is a strip having a stopper at an edge of the strip to prevent the strip from slipping out from the first two electrode plates.