Method and device for monitoring accumulator property using transient DC small current electric quantity comparison method

Abstract

The invention discloses a new method for testing the internal resistance of storage batteries, and a device for testing the internal resistance, voltage and temperature of each storage battery in real time and on-line by using the new method. The uniqueness of this new method is that when testing the internal resistance of the storage battery, the transient DC small current electric quantity comparison method is used. The basic principle is to make the transient DC small current pass through the battery to be tested and the comparison resistor connected in series with it, measure the power consumption of this small current on the equivalent internal resistance of the battery and the comparison resistance, and compare the internal resistance of the battery. When the device using this new method is used to test the internal resistance of the battery, its anti-interference, repeatability, real-time and safety have reached the leading level in this field, which is beyond the reach of other methods such as the existing high-current discharge method and AC injection method. comparable. The digital transmission and the modular structure make the test system based on the device of the present invention very flexible and easy to expand functions.

Description

technical field [0001] The invention relates to the field of battery performance monitoring, in particular, the internal resistance (and thus the remaining capacity can be estimated), voltage and temperature of the battery can be monitored. technical background [0002] With the development of science and technology, the application of batteries in various fields has become more and more common, and its importance has become increasingly apparent. However, failures and accidents caused by battery problems also occur frequently, and some accidents are even catastrophic. Whether the performance and health status of the battery can be diagnosed in real time and online so as to be dealt with in a timely manner will be a necessary prerequisite to avoid appeal failures and accidents. [0003] The method of measuring the terminal voltage of the battery used in this front does not truly reflect the performance and health of the battery. Only by comprehensively testing and comprehe...

AI Technical Summary

Problems solved by technology

When using this device to test the internal resistance of the battery, since the DC signal of milliamp / millisecond level is applied to the battery, and the power comparison method is used, it not only overcomes the shortcomings of the high-current discharge method that has a strong impact on the battery and poor real-time performance, but also It overcomes the shortcoming that the AC injection method is susceptible to various factors

Images