BATTERY DEGRADATION DETERMINATION DEVICE, BATTERY DEGRADATION DETERMINATION METHOD AND BATTERY DEGRADATION DETERMINATION SYSTEM

摘要

PURPOSE: A battery degradation detecting device is provided to reduce fitting errors without increasing the number of circuit constants of an equivalent circuit model for detecting the degradation degree of a battery. CONSTITUTION: A battery degradation detecting device(100) comprises a fitting module(140) with a constant phase element which is connected to the module in parallel, fits AC impedance measurement data to a constant circuit model, and obtains circuit constants of an equivalent circuit model; a P-value storage module(150) storing the P value of the constant phase element; and a degradation detecting module(160) which determines the degradation of a battery based on the obtained circuit constants. [Reference numerals] (100) Battery degradation detecting device; (110) Controller; (120) Input and output module; (130) Fitting initial value setting module; (140) Fitting module; (150) P-value storage module; (160) Degradation detecting module; (200) Circuit constant-degraded degree relation database; (300) AC impedance measuring device; (310) AC impedance measuring module; (320) AC impedance measuring condition setting module; (330) Measured data storage module; (AA) Record; (BB) Nyquist diagram data; (CC) Reference; (DD) Record·reference; (EE) Manipulation and setting; (FF) Verification result