BATTERY-STATE MONITORING SYSTEM

摘要

Provided is a battery-state monitoring system capable of efficiently and highly accurately estimating the battery state and life of each of a plurality of batteries always connected to a device, by automatically measuring or obtaining various parameters. A battery-state monitoring system (1) for monitoring the state of each battery (41) in a device provided with a battery pack in which a plurality of batteries (41) are connected in series, the battery-state monitoring system (1) having: a control/power supply device (50) for detecting the current in each battery (41); and extension devices (30) for measuring the temperature and voltage in each battery (41), and the internal resistance of at least two types of frequencies of each battery (41). Therein, the deterioration of each battery (41) is estimated on the basis of one or more values selected from among the temperature, voltage and internal resistance measured by the extension devices (30), and the DC resistance of each battery (41) obtained from the ratio of the amount of change in the value of the current detected by the control/power supply device (50) when each battery (41) discharges, to the amount of change in the value of the voltage measured by the extension devices (30).