Deterioration judging device and method, computer program

Abstract

This invention provides a battery degradation determining apparatus capable of deduce the capacity of a storage battery. In the battery degradation determination method, the battery degradation state of the battery to be measured is determined. The apparatus reduces the voltage output from a rectifier supplying power to a load, measures current flowing from the rectifier for connecting the battery to be measured to the output side in parallel and the battery to the load connected to the output of the rectifier in parallel and a dummy load device connected to the output of the rectifier in parallel separately from the load; controls the load of the dummy load device, such that the measured current is a predetermined current value; and calculates the remaining capacity of the battery, based on the discharge time of the discharge current of discharging the battery to the load and the dummy load device and the terminal voltage of the battery, corresponding to the discharge current at the discharge time, by referring to a battery data storage section for storing battery data indicating the relation among the discharge time, the terminal voltage, and the residual capacity at a predetermined current of the battery to be measured.

Description

Technical field [0001] The present invention relates to a deterioration judgment device, a deterioration judgment method, and a computer program having a deterioration diagnosis function of a secondary battery, particularly a lithium ion battery, in a power supply system having a secondary battery as a backup. Background technique [0002] In the past, in DC power supply systems that supplied direct power to communication equipment such as telephone exchanges, spare storage batteries were maintained by floating charging. In this system, the load device and battery are connected in parallel on the output side of the rectifier. The rectifier always supplies DC power to the load and supplies the necessary charging current to fully charge the battery according to the state of charge of the battery. In this system, if a power outage or a rectifier failure occurs, the discharge from the battery is performed instantaneously, and even for a moment, the power supply to the load device wil...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the remaining capacity of the storage battery cannot be grasped.

[0007] Therefore, even if you try to "estimate the remaining capacity of the battery", since the actual load is directly discharged, the discharge current value cannot be guaranteed to be a fixed value.

Therefore, the measured discharge voltage characteristics are different from the constant current discharge characteristics, and capacity estimation cannot be performed.

[0008] In addition, the relationship between the remaining capacity of the battery and the voltage characteristics is not clear, which is the biggest obstacle in the implementation of capacity estimation.

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