Patent ID: 9297859
Filing Date: 2016-03-29
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 in an equipment provided with an assembled battery composed of the storage batteries connected in series and a power generation facility utilizing natural energy, the system comprising: a current detecting unit which detects a current in each of the storage batteries; a state measuring unit 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; and a prime monitoring unit which acquires measurement data from the state measuring unit corresponding to each of the storage batteries and issues an instruction related to an operation to the current detecting unit and the state measuring unit, wherein the prime monitoring unit estimates degradation of each of the storage batteries based on at least one or more values of the temperature, the voltage, and the internal resistance measured by the state measuring unit 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 unit and a change in a voltage value measured by the state measuring unit during discharging and charging of each of the storage batteries, and the prime monitoring unit applies a constant current from the state measuring unit to the storage battery whose voltage is higher than a predetermined value, thereby decreasing the voltage.