Online inspection system for internal resistances of batteries

Abstract

An online inspection system for internal resistances of batteries comprises a power supply module, a voltage inspection control module, an internal resistance inspection control module, a constant-current discharge module, an automatic gain control high-precision differential acquisition module, a microprocessor module, an abnormality detection module and a communication module. The power supply module provides a variety of power supplies for a complete machine and provides isolated power supplies for the constant-current discharge module, the high-precision differential acquisition module and the communication module. First, low-current constant-current discharge is carried out on a battery and is stopped after a certain period of time; then, variation of voltage of the battery by taking a specified time interval as a unit time in the whole process and voltage variation in a certain period of time after discharge are recorded; next, the value V of the voltage is calculated through a mathematical model by carrying out trend analysis on variation of the voltage with the time and subdividing the data; and finally, the internal resistance of a monomer battery is calculated by using the Ohm's law according to the V and a discharge current I.

Description

technical field [0001] The invention relates to a detection system for the internal resistance of a storage battery, in particular to an online inspection system for the internal resistance of a storage battery. Background technique [0002] The state of the battery directly affects the normal operation of the UPS and the safety of the power supply system, and even leads to power interruption and system shutdown, resulting in heavy losses. Therefore, online monitoring of the battery is very important. The internal resistance of the battery is an important indicator of the state of the battery. The change in internal resistance can reflect the aging degree, capacity and failure of the battery. Therefore, internal resistance monitoring is the main target of battery monitoring. At this stage, it is suitable for online monitoring of battery internal resistance. Usually DC discharge method and AC excitation method. [0003] DC discharge method: short-term discharge the battery w...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the damage to the storage battery caused by the DC high current discharge method to measure the internal resistance of the storage battery and to solve the problem of poor repeatability accuracy in the measurement of the internal resistance of the ordinary DC current discharge industry, the present invention proposes to discharge with a constant small current, through the voltage change trend Analyze and establish a mathematical model, and use the acquisition circuit of automatic gain control to calculate the online monitoring system of the internal resistance of the battery

Images