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1. (WO2018084675) REACTION ESTIMATION METHOD FOR SECONDARY BATTERY AND SECONDARY BATTERY COMPRISING BATTERY CELL USED FOR SAME

Pub. No.:    WO/2018/084675    International Application No.:    PCT/KR2017/012495
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Tue Nov 07 00:59:59 CET 2017
IPC: G01R 31/36
H01M 10/48
H01M 10/42
Applicants: LG CHEM, LTD.
주식회사 엘지화학
Inventors: CHO, Hyung-Man
조형만
LEE, Sol-Nip
이솔닢
OH, Song-Taek
오송택
LEE, Hyeok-Moo
이혁무
Title: REACTION ESTIMATION METHOD FOR SECONDARY BATTERY AND SECONDARY BATTERY COMPRISING BATTERY CELL USED FOR SAME
Abstract:
The present invention provides a reaction estimation method for a secondary battery and a battery cell used for the same for designing a secondary battery in which a rapid charging performance is improved by estimating a reaction of a electrode in a thickness direction, the method comprising: (a) a step of preparing a battery cell which has a structure of a first electrode/a separating film/a reference electrode/a separating film/a second electrode, wherein the second electrode has a structure of an upper layer portion/a porous film/a lower layer portion; (b) a step of setting a state-of-charge to estimate a reaction of the battery cell; (c) a step of measuring a voltage and a current respectively of the upper layer portion, the lower layer portion, and the battery cell while reaching the set state-of-charge; (d) a step of measuring an open circuit voltage of the upper layer portion, the lower layer portion, and the battery cell after the state-of-charge; and (e) a step of comparing and analyzing a capacitance, obtained using the measured current, and the measured open circuit voltage.