Battery capacity on-line measuring system and measuring method based on damped oscillation

Abstract

The invention discloses a battery capacity on-line measuring system and measuring method based on damped oscillation. An inductor, a capacitor and an equivalent internal resistor of a battery to be measured are utilized to form an RLC oscillating circuit; a control processor controls the connection and disconnection of a switch tube to enable the inductor to be charged and discharged, and a damped oscillation waveform is generated in the RLC circuit; the waveform is collected by a differential amplification circuit, and after the signal is processed through an AD conversion module, attenuation coefficient thereof is calculated by the control processor; and since the attenuation coefficient is associated with the inductor and the equivalent internal resistor, and precise value of the inductor can be measured online, and the internal resistance can be calculated. Through the system, a comparison table between the battery internal resistance and residual capacity can be obtained in advance; and by comparing the measured battery internal resistance with the known table, the battery capacity can be obtained, and the final result is output through a display module. The detection circuit adopted in the invention is simple in structure; the battery is lossless in the measuring process; and the system and method are convenient and safe to use.

Description

technical field [0001] The invention belongs to the technical field of on-line measurement of battery performance, and in particular relates to an on-line measurement system of battery capacity based on damped oscillation and a measurement method thereof. Background technique [0002] As a reusable energy storage device, batteries are widely used in people's production and life, and obtaining the capacity status of batteries in time is of great significance to ensure the normal operation of equipment. So far, the detection methods of battery capacity mainly include the following: [0003] (1) Check discharge method; that is, the deep discharge of 100% C, although it has the advantages of accurate and reliable test results, its disadvantages are also very prominent, such as: ① The discharge time is long, the risk is high, and the chemical energy stored in the battery pack is all in the form of thermal energy. It is a waste of electricity, time-consuming and laborious, and ha...

AI Technical Summary

Problems solved by technology

[0011] It can be seen that whether it is to study the terminal voltage characteristics of the battery when it is discharged, or to study the internal mechanism of the battery, it is impossible to accurately measure the remaining capacity of the battery.

Although deep discharge has high precision, due to its inherent shortcomings such as high consumption and heavy workload, it is only suitable for testing once every few years as a battery pack, and cannot be used for daily monitoring.

The method of measuring the capacity of the battery by measuring the internal resistance of the battery is a relatively prominent and feasible method, but there is still a lot of room for improvement in how to realize it

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