Multi-state online monitoring system for lead-acid storage battery

Abstract

The invention relates to a multi-state online monitoring system for a lead-acid storage battery, and belongs to the technical field of battery safety monitoring. The system comprises a body monitoringmodule, an environment monitoring module and a monitoring background. The body monitoring module comprises an internal resistance monitoring unit, a floating charge current monitoring unit and a lead-acid storage battery surface temperature monitoring unit. The internal resistance monitoring unit comprises a switching circuit, a constant-current discharge load and a voltage sensor which are connected in sequence, and the constant-current discharge load and the voltage sensor are connected in parallel. The floating charge current monitoring unit comprises a modulation circuit, an open type fluxgate probe, an overvoltage protection circuit and a signal processing circuit which are connected in sequence. The environment monitoring module is located in the lead-acid storage battery chamber and comprises a combustible gas monitoring unit, a smoke monitoring unit, a humidity monitoring unit and an image monitoring unit. Real-time state acquisition and monitoring are carried out on judgmentfactors which are sensitive to lead-acid storage battery failure or extremely early fire, and the accuracy of lead-acid storage battery fire identification is improved.

Description

technical field [0001] The invention relates to a multi-state online monitoring system for a lead-acid storage battery, which belongs to the technical field of battery safety monitoring. Background technique [0002] Substation DC power supply system is the working power source of substation secondary system relay protection, safety automatic device, and automation equipment, etc., and is the basic guarantee for safe and reliable operation of substation. As the core part of the DC power system, the battery is the only back support for the DC power system to continue to provide working power for the load when the AC input is abnormal. Therefore, once the battery is damaged, the relay protection device will lose its working power and the ability to quickly remove the accident load, which will directly cause major equipment damage or a complete shutdown of the substation, causing heavy losses to power grid companies and the national economy. [0003] Lead-acid batteries have t...

AI Technical Summary

Problems solved by technology

When the lead-acid battery is required to output power to the outside world, if the internal resistance of a certain lead-acid battery increases or the connection bar between two lead-acid batteries is loose, resulting in an increase in contact resistance, when the discharge current passes through this part, the internal resistance of the lead-acid battery will be damaged. or the temperature of the pole rises sharply and can be exacerbated over time

When the temperature rises to a certain level, it will cause the battery terminals to heat up and cause the shell material to carbonize, and the ABS will smoke and catch fire.

[0007] (2) Thermal runaway of lead-acid batteries leads to explosion of lead-acid batteries

However, there is no real-time monitoring of the sensitive factors for the judgment of lead-acid battery failure or early fire, such as increased internal resistance of lead-acid battery, abnormal floating charge state, continuous rise of lead-acid battery surface temperature, Combustible gas precipitation, etc.

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