CAPACITY ESTIMATION METHOD, DEGRADATION ESTIMATION METHOD AND DEGRADATION ESTIMATION APPARATUS FOR Li-ION CELL, AND Li-ION BATTERY

摘要

PURPOSE: Provided are a capacity estimation method, a degradation estimation method and a degradation estimation apparatus for the lithium-ion cell, and the lithium-ion battery. CONSTITUTION: In the first capacity estimation method for a Li-ion cell, an elapsed time from the time when charge voltage in constant current charge reaches a predetermined voltage to the time when charge condition is changed to a constant voltage mode is used for calculating an estimated capacity of said Li-ion cell. In the second method, a charge current after a lapse of a predetermined time from the time when charge condition is changed to a constant voltage mode is used. In the third method, an elapsed time from the time when charge condition is changed to a constant voltage mode to the time when charge current becomes alpha (0 < alpha < 1) times is used.