Patent ID: 9459323
Filing Date: 2016-10-04
CPC Classification: G01R,H02J,Y02E

Claim Text:
1. A battery-state monitoring system which monitors a state of each of a plurality of storage batteries connected in series and constituting an assembled battery incorporated in an equipment, the system comprising: a current detecting device which detects a current in each of the storage batteries; and a state measuring device which measures a temperature, a voltage, and internal resistance of each of the storage batteries, the internal resistance being measured by using at least two or more kinds of frequencies including at least a first frequency of lower than 200 Hz and a second frequency of 200 Hz or higher to lower than 2000 Hz, wherein degradation of each of the storage batteries is estimated based on at least one or more values of the temperature, the voltage, and the internal resistance measured by the state measuring device and a DC resistance of each of the storage batteries obtained from a ratio between a change in a current value detected by the current detecting device and a change in a voltage value measured by the state measuring device during discharging of each of the storage batteries; wherein the state measuring device measures and records a temperature and a voltage regularly at a given time interval, and when a state where a voltage drop from a normal voltage value by a given threshold or more has continued for a given time is detected, the state measuring device protects measurement data of the voltage obtained in a given time range before and after a point of time of the detection so as not to be lost.