Lithium-ion cell capacity estimation for electronic devices, involves estimating capacity of cell based on elapsed time from time when charge voltage reaches specified value to time when charge condition is changed

摘要

An elapsed time (t) from the time when charge voltage is constant current charge reaches a predetermined voltage (Vs) to the time when charge condition is changed from a constant current mode to a constant voltage mode, is obtained when lithium-ion cell is charged by a constant current and voltage method. An estimated capacity of lithium-ion cell is calculated using the elapsed time (t). - Independent claims are also included for the following: - (a) Degradation estimation method; - (b) Degradation estimation apparatus; - (c) Lithium-ion battery; - (d) Capacity estimation apparatus