Stepped electrode assembly having predetermined a thickness ratio in the interface between electrode units, battery cell and device comprising the same
AssigneeLG Chem, Ltd.
InventorsSung-Jin Kwon, Soon-Ho Ahn, Dong-Myung Kim, Ki-Woong Kim, Young-Hoon Kim, Sung-Han Yoon, Seung-Min Ryu
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Abstract
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.
Claims30
An electrode assembly comprising a combination of two or more types of electrode units 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
- to prevent swelling, 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.
Dependencies are inferred from the claim text.