High capacity battery cell employed with two or more unit cells

摘要

Disclosed herein is a secondary battery including two or more stacking-folding type cells (‘unit cells’) manufactured by winding small-sized electrode assemblies (‘bicells’) constructed in a stacking type structure in which electrodes having the same polarity are located at opposite sides of each electrode assembly and small sized electrode assemblies (‘full cells’) constructed in a stacking type structure in which electrodes having different polarities are located at opposite sides of each electrode assembly using a long separator sheet, wherein the unit cells are mounted in a battery case, each unit cell has one or more electrode terminals protruding from each end of each unit cell, and the unit cells are mounted in a receiving part of the battery case such that the unit cells are arranged in a stacking arrangement structure or a plane arrangement structure while the electrode terminals of the unit cells are connected with each other.

主权项

1. A secondary battery comprising:
two or more unit cells and a long separator sheet in one battery case, wherein each unit cell comprises electrode assemblies of a stacking type structure in which electrodes having the same polarity are located at opposite sides of each electrode assembly or electrode assemblies of a stacking type structure in which electrodes having different polarities are located at opposite sides of each electrode assembly, wherein the long separator sheet is disposed between and winds selected electrode assemblies to constitute a first unit cell and a remaining end of the long separator sheet surrounds other unit cells, the other unit cells having another separator sheet disposed between and winding other electrode assemblies to constitute other unit cells, wherein each unit cell extends between first and second opposing ends, the first end having at least one first terminal protruding therefrom in a first direction, the second end having at least one second terminal protruding therefrom in a second direction opposite the first direction, and wherein the unit cells are arranged in a stacking arrangement structure or a plane arrangement structure in the battery case while the electrode terminals of the unit cells are connected with each other.