Method for predicting residual capacity of a closed secondary battery, residual capacity predicting system, method for acquiring battery internal information, and battery control method

摘要

A method for predicting a residual capacity of a closed secondary battery, the method comprising: detecting deformation of the closed secondary battery during a charge / discharge cycle (C1) before a time when a residual capacity is predicted to detect a charge / discharge capacity and a deformation amount Obtaining a first curve expressing a relationship between a charge amount and a deformation amount of a sealed secondary battery in a predetermined reference state by fitting a first curve to a second curve indicating a relationship between a charge- A step of detecting a deformation amount (Tm) of the sealed secondary battery during a charge / discharge cycle (C2) subsequent to the charge / discharge cycle (C1), a step of detecting a deformation amount (Qm) is obtained based on the second curve L2 and the difference between the charge / discharge capacity Qd and the charge / discharge capacity Qm in the fully discharged state in the second curve L2 is obtained as the residual capacity Qr Step.