Method and device for detecting service life of battery of power distribution terminal

Abstract

The invention discloses a method and device for detecting service life of a battery of a power distribution terminal. The method comprises the following steps: acquiring terminal voltages at the two ends of a detected battery, and detecting an internal resistance of the detected battery; after completing the detection for the internal resistance, performing a discharge test on the detected battery, thereby acquiring a short-time discharge curve; acquiring a detection reference voltage point according to an initial detection voltage and an ending detection voltage; acquiring a standard discharge curve of the detected battery, thereby acquiring a standard gradient; acquiring an estimated value of the capacity of the detected battery according to a capacity computational formula; and performing internal resistance and temperature compensation on the detected battery, thereby acquiring a practical capacity of the detected battery. According to the method and device provided by the invention, the practical capacity of the detected battery is subjected to a short-time discharge test on the basis of the voltage change ratio, so that the test time is short, the electric power of the detected battery needs not be all released, the energy waste is reduced, the relation of the capacity, the temperature and the internal resistance is comprehensively considered, the capacity test is accurate and the evaluation for the health state of the detected battery is reasonable.

Description

technical field [0001] The invention relates to the technical field of power distribution automation, in particular to a method and device for detecting battery life of a power distribution terminal. Background technique [0002] The battery of the power distribution terminal equipment is used as a backup power supply to continuously supply power to the terminal. When the on-site power failure occurs, the battery pack will become the only power source for the power distribution terminal. In recent years, as users have higher and higher requirements for power supply reliability, power distribution terminals are also widely used in power distribution automation. Once the battery is aging or has insufficient capacity, it may cause the power distribution terminal to fail to work normally. , so that the power distribution automation system fails, so it is necessary to test the performance of the battery regularly to keep abreast of the health status of the battery. [0003] At p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a battery life detection method and device for power distribution terminals to solve the problems of long test time, inaccurate test results and serious waste of battery capacity in existing detection methods

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