PERFORMANCE ESTIMATION DEVICE AND PERFORMANCE ESTIMATION METHOD OF LEAD ACID STORAGE BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a performance estimation device and a performance estimation method of lead acid storage battery, improving an estimation accuracy of performances of the lead acid storage battery.SOLUTION: A performance estimation device 10 of a lead acid storage battery comprises: an estimation part 11 that estimates a parameter and an open circuit voltage of the lead acid storage battery based on a terminal voltage and charge/discharge current of the lead acid storage battery; an internal resistance calculation part 13 calculating internal resistance of the lead acid storage battery using the parameter; and a battery performance calculation part 16 that determines that a sum of an open circuit voltage reduction amount of the lead acid storage battery generated when the lead acid storage battery is discharged by current I for a time T and a voltage drop amount due to the internal resistance is equal to a difference between the open circuit voltage and a predetermined discharge final voltage, and that calculates the current I or the time T. When one of the current I and the time T is determined to a predetermined value, the battery performance calculation part 16 calculates the other of the current I and the time T.