REMAINING LIFE DETERMINATION DEVICE, REMAINING LIFE DETERMINATION SYSTEM, AND REMAINING LIFE DETERMINATION METHOD

摘要

The purpose of the present invention is to improve the accuracy of the determination of the remaining life of a lead-acid battery. An open-circuit voltage estimation unit (101) estimates an open-circuit voltage (OCV) on the basis of the measurement results of a voltage measurement unit (10) and a current measurement unit (30). An internal resistance estimation unit (103) estimates an internal resistance on the basis of the measurement results of the voltage measurement unit (10) and the current measurement unit (30). A replacement necessity determination unit (107) determines the remaining life of a lead-acid battery (2) by comparing the open-circuit voltage and a first threshold value. Additionally, the replacement necessity determination unit (107) determines the remaining life of the lead-acid battery (2) by comparing the internal resistance and a second threshold value.