Capacity deterioration rate estimation method for non-aqueous lithium-type power storage elements, capacity deterioration rate estimation device, and system

摘要

To provide a deterioration estimation method and a deterioration estimation device or a deterioration estimation system of nonaqueous lithium type power storage component where active charcoal and a lithium transition metal oxide having olivine structure is blended to the positive electrode.SOLUTION: A discharge curve taking the discharge capacity on the abscissa axis and the voltage on the ordinate, when a nonaqueous lithium type power storage component containing, as a positive electrode active material, active charcoal and a lithium transition metal oxide having spinel structure capable of occluding and discharging lithium ion is subjected to constant current discharge is divided into a first region, a second region and a third region, in order from the high voltage side, and a database group indicating the capacity deterioration coefficients of respective regions as the parameters of voltage and temperature is created, voltage and temperature of the power storage component in operation are measured, capacity deterioration coefficients corresponding to the measured voltage and temperature are calculated from the database group, and then the capacity deterioration coefficients of the power storage component are estimated by totalizing the capacity deterioration coefficients of the first, second and third regions, while furthermore the capacity deterioration coefficients of the power storage component are estimated by integrating the estimation capacity of each time.SELECTED DRAWING: Figure 1