A DC system for online detection of internal resistance of parallel batteries

Abstract

The invention discloses a direct-current system for detecting the internal resistance of parallel storage batteries in an online manner, and relates to the technical field of detection on the internal resistance of storage batteries. The direct-current system comprises intelligent modules, wherein the intelligent modules are in one-to-one correspondence to the storage batteries; each intelligent module is connected with an alternating-current power distribution unit through a power switch and comprises an EMI (electro-magnetic interference) circuit, a power factor correcting circuit, a control circuit and a constant-current generator; each EMI circuit is connected with the corresponding alternating-current power distribution unit; each power factor correcting circuit, each control circuit and each constant-current generator are respectively connected with the corresponding EMI circuit; each power factor correcting circuit is connected with a first DC (direct-current) / DC converter and a second DC / DC converter; each constant-current generator is connected to two ends of the corresponding storage battery in parallel; each control circuit comprises an alternating-current differential circuit, an analog multiplier, a low-pass filter, a direct-current amplifying circuit, an analog / digital conversion circuit and a singlechip; each alternating-current differential circuit is connected to two ends of the corresponding storage battery in parallel; each analog multiplier is connected with the corresponding alternating-current differential circuit; each low-pass filter is connected with the corresponding analog multiplier; each direct-current amplifying circuit is connected with the corresponding low-pass filter; each analog / digital conversion circuit is connected with the corresponding direct-current amplifying circuit; and each singlechip is connected with the corresponding analog / digital conversion circuit. By the direct-current system, the actual internal resistance of a single storage battery can be measured in real time in an online manner; and the reliability of the direct-current system is improved.

Description

Technical field [0001] The invention relates to the technical field of battery internal resistance detection, in particular to a DC system for online detection of the internal resistance of batteries in parallel. Background technique [0002] The battery is an important part of the DC system and determines the backup time of the system. The internal resistance of the battery determines its performance. The greater the internal resistance, the more energy the battery consumes, and the lower the efficiency of the battery. A battery with a large internal resistance generates a lot of heat during charging. When the generated heat cannot be dissipated in time, it will further cause the thermal runaway of the battery, which will generate a large pressure inside the battery. Once the pressure exceeds the maximum capacity of the battery. It will cause the explosion of the battery and its chain reaction, and the consequences will be very serious. The traditional DC system can only meas...

AI Technical Summary

Problems solved by technology

It will cause the explosion of the battery and its chain reaction, and the consequences will be very serious

However, the traditional DC system can only measure the voltage and temperature of the battery online, but cannot measure the internal resistance of the battery online. When it is necessary to measure the internal resistance of the battery, it can only be measured after the battery pack is powered off and separated from the system. , requires a lot of manpower, material resources and time

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