CHARGEABLE BATTERY STATE DETECTION APPARATUS AND CHARGEABLE BATTERY STATE DETECTION METHOD

A chargeable battery state detection apparatus configured to detect a state of a chargeable battery is provided, comprising processor(s) and memorie(s) communicatively connected to the processor(s), wherein the processor(s) read out a group of instructions stored in the memorie(s), and execute a detection process for detecting a voltage and a current of the chargeable battery; a storage process for storing voltage values detected at different times by the detection process after charge and discharge is stopped; a fitting process for fitting, with respect to the voltage values, by adjusting coefficients of a predetermined function; a calculation process for calculating an open circuit voltage based on the function; and a discard process for discarding at least a part of the voltage values stored by the storage process when a current value or a voltage value detected by the detection process fluctuates by a predetermined threshold value or greater.