STEPPED ELECTRODE ASSEMBLY HAVING PREDETERMINED A THICKNESS RATIO IN THE INTERFACE BETWEEN ELECTRODE UNITS, BATTERY CELL AND DEVICE COMPRISING THE SAME

摘要

There are provided an electrode assembly, and a battery cell, a battery pack, and a device. The electrode assembly includes a combination of two or more types of electrode units having different areas, wherein the electrode units are stacked such that steps are formed, and electrode units are formed such that a positive electrode and a negative electrode face one another at an interface between the electrode units.

主权项

1. An electrode assembly comprising a combination of two or more types of electrode unit having different areas, the electrode units being stacked so as to form a stepped portion therebetween,
wherein a positive electrode and a negative electrode are formed to face each other at an interface between the electrode units, and Equation 4 is satisfied:
dNn/dPn≦dNn/dPn+1,  Equation 4: where n is an integer not less than 1, dNn is a thickness of the negative electrode of the electrode unit that is the n-th largest in area, dPn is a thickness of the positive electrode of the electrode unit that is the n-th largest in area, and dPn+1 is a thickness of the positive electrode of the electrode unit that is the (n+1)th largest in area.