A fire warning method for lithium-ion batteries in energy storage systems

Abstract

The invention relates to a fire warning method for a lithium-ion battery in an energy storage system, belonging to the technical field of lithium-ion batteries. The early warning method of the present invention adopts the lithium ion battery fire early warning system of the energy storage system. A plurality of lithium ion battery cells of the present invention can be loaded into the battery unit of the energy storage box, and an air flow channel is arranged outside the battery unit, which can prevent the energy storage box from For the accumulation of heat in the body, each battery unit contains a sensing fiber optic channel, so that the temperature and strain parameter changes of each lithium-ion battery cell are monitored by the sensing fiber, and converted into electrical signals by photodetectors, and the data is collected After being collected by the sensor, it is transmitted to the computer for statistics, and real-time monitoring and early warning. The invention realizes the real-time display of the temperature and strain of the single battery in the lithium-ion battery module, and can conveniently and effectively monitor the thermal runaway of the lithium-ion battery system of the energy storage system.

Description

technical field [0001] The invention relates to a fire warning method for a lithium-ion battery in an energy storage system, belonging to the technical field of lithium-ion batteries. Background technique [0002] A large number of lithium-ion battery energy storage projects have been deployed at home and abroad. With the continuous deployment of energy storage power stations, fire accidents in energy storage systems have become more frequent, and fire accidents in lithium-ion battery energy storage systems are mostly caused by lithium-ion battery Fire accidents caused by thermal runaway. As a key component of the energy storage system, lithium-ion batteries have a huge impact on the energy storage capacity, safety and economy of the entire energy storage system. [0003] Although the thermal runaway process of lithium-ion batteries is very complicated, its essence can be regarded as the instantaneous overheating expansion process in a confined space caused by abnormal use o...

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Problems solved by technology

[0005] Thermocouple detection technology is a contact temperature measurement technology, so in lithium-ion battery energy storage systems, only thermocouple monitors can be used to measure the temperature of sampling points on the battery surface, and the maximum temperature of the battery cannot be known. mistake

In addition, limited temperature data cannot reflect the overall temperature distribution characteristics of the battery, which directly affects the analysis and judgment of lithium battery safety.

[0006] Infrared thermal imaging technology is a flexible automatic temperature measurement technology, but in energy storage systems, infrared imaging is a surface temperature measurement technology, and lithium-ion batteries in energy storage systems are generally placed in the form of battery packs, which will What causes it to measure is only the temperature distribution at all points on the battery surface

And when measuring the temperature of the lithium-ion battery, it is necessary to align the surface of the lithium-ion battery pack vertically. In any case, the angle should not exceed 30°, and the distance from the radiation source to the optical system should not be too far. There are certain limitations in the application of energy storage systems

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