High-frequency discharge storage battery internal resistance online detection method

Abstract

The invention discloses a high-frequency discharge storage battery internal resistance online detection method. A detection system comprises a storage battery and a controller; the storage battery isconnected with an ADC sampling circuit; and two ends of the storage battery are connected with a discharge loop. The on-line detection method comprises the steps of: sampling voltage and recording waveform; turning on a discharge loop; adjusting a control switch S2 to discharge; obtaining discharge sampling result data; executing an internal resistance analysis algorithm; and obtaining an internalresistance analysis result. The method is brand new and efficient. The defects of a traditional internal resistance measurement method are overcome; irreversible damage to the battery caused by large-current discharge is avoided; measurement errors caused by electromotive force change of the storage battery in a discharge method are avoided; noise interference of part of a charger is eliminated,and online detection is realized; the difficulty of the real-time detection of the internal resistance of the storage battery is overcome; and the continuous real-time measurement of the internal resistance of the storage battery is realized.

Description

technical field [0001] The invention belongs to the technical field of battery internal resistance detection, and in particular relates to an online detection method for high-frequency discharge battery internal resistance. Background technique [0002] As the most important energy storage carrier in modern society, batteries are used in all aspects of our lives. The safety of batteries has received widespread attention. As the most important parameter of the battery, the internal resistance reflects the performance and health status of the battery. It is of great significance to accurately measure the internal resistance of the battery, especially the online measurement of the internal resistance of the battery. [0003] There are many difficulties in the measurement of battery internal resistance. First of all, the internal resistance value is generally only a few milliohms, which requires very precise measurement techniques or ingenious measurement methods. Second, th...

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Problems solved by technology

[0005] In view of this, in order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an online detection method for the internal resistance of a high-frequency discharge battery, which is new and efficient, solves the disadvantages of the traditional internal resistance measurement method, and overcomes the problem of high-current discharge. Cause irreversible damage to the battery, and the measurement error caused by the change of the electromotive force of the battery in the discharge method; overcome the noise interference of some chargers, realize online detection; overcome the difficulty of real-time detection of the internal resistance of the battery, and realize continuous real-time measurement of the internal resistance of the battery, etc.

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