A device and method for measuring battery internal resistance

Abstract

The present invention relates to a device and method for measuring the internal resistance of a storage battery. The device comprises a system control module, a current sampling circuit, an incremental load control circuit, a dynamic incremental load module, an accurate load control circuit, a dynamic precise load module, a reduced load control circuit, a dynamic reduction load module and a display and interaction module. An input end of the current sampling circuit is connected to an output end of a measured storage battery. An output end of the current sampling circuit is connected to an input end of the system control module. Three output ends of the system control module are connected to input ends of the incremental load control circuit, the accurate load control circuit and the reduced load control circuit. The display and interaction module and the system control module are in bi-directional connection. According to the device and the method, the short-circuited current and internal resistance of a fixed type valve regulated sealed lead-acid storage battery can be accurately, automatically and rapidly measured, a measurement result is stable, and the accuracy is high.

Description

technical field [0001] The invention relates to a device and a method for measuring the internal resistance of a storage battery, and is especially suitable for measuring the short-circuit current and internal resistance of a fixed valve-controlled sealed lead-acid storage battery, belonging to the technical field of detection of a lead-acid storage battery. Background technique [0002] In many industrial fields and service fields, such as information industry, power system, and medical treatment, DC power supply systems and uninterruptible power supply systems are used. In the DC power system and the uninterruptible power system, the battery pack plays an extremely important role. The internal resistance of the battery determines the level of its short-circuit current, which is an important basis for the switch configuration of the DC power system and a symbol of the battery's load capacity. The internal resistance of the battery after being put into operation directly af...

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Problems solved by technology

Although IEC60896-2 and GB / T19638.2-2005 stipulate the quadratic method to calibrate the resistance, because the two discharges of the quadratic method require a standard square wave, especially for the second discharge, the current value is very large, which is 20I 10 , and the time is short, only 5 seconds. So far, due to the limitation of on-site test conditions, there is no one that strictly meets the requirements of the quadratic square wave method, has high repeatable measurement accuracy, and is convenient for testing the fixed valve-regulated sealed lead-acid battery. Equipment for automatic single square wave discharge during resistance and short circuit current testing

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