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Lithium - ion battery thermal runaway is a serious safety hazard that can lead to fires and explosions, posing significant risks to both human safety and property. Therefore, the research on lithium - ion battery thermal runaway monitoring technologies has become a critical area of focus in the battery industry. These technologies aim to detect the early signs of thermal runaway, enabling timely interventions to prevent catastrophic failures.
One of the main approaches to thermal runaway monitoring is the use of temperature sensors. Traditional thermocouples and resistance temperature detectors (RTDs) are commonly employed to measure the surface temperature of battery cells or battery packs. By continuously monitoring the temperature, sudden temperature increases can be detected, which may indicate the onset of thermal runaway. However, surface - temperature - based monitoring has limitations, as thermal runaway often initiates internally within the battery cell. To overcome this, researchers are developing advanced temperature - sensing techniques, such as fiber - optic temperature sensors. These sensors can be inserted into the battery cells, allowing for direct measurement of the internal temperature and providing more accurate and early - warning signals.
Gas - sensing technology is another important aspect of thermal runaway monitoring. During thermal runaway, various combustible and toxic gases are released, such as carbon monoxide, hydrogen, and hydrocarbons. Gas sensors, including electrochemical gas sensors and metal - oxide - semiconductor (MOS) gas sensors, can be used to detect the presence and concentration of these gases. By monitoring the gas composition and concentration in the battery environment, the occurrence of thermal runaway can be identified at an early stage. Moreover, the type and concentration of the released gases can provide valuable information about the severity and progress of the thermal runaway event, helping to determine the appropriate response measures.
Electrochemical monitoring techniques are also being explored for thermal runaway detection. Changes in the electrical characteristics of the battery, such as internal resistance, voltage fluctuations, and impedance variations, can be indicative of thermal runaway. Electrochemical impedance spectroscopy (EIS) can be used to analyze the impedance changes of the battery over time. By comparing the measured impedance data with the normal operating characteristics, deviations can be detected, which may signal the onset of thermal runaway. Additionally, real - time monitoring of the battery's voltage and current profiles can reveal abnormal patterns that are associated with thermal runaway, such as sudden voltage drops or current surges.
In recent years, the integration of multiple monitoring technologies, known as multi - parameter monitoring, has gained increasing attention. By combining temperature sensing, gas sensing, and electrochemical monitoring, a more comprehensive and accurate picture of the battery's state can be obtained. Advanced data - processing algorithms and artificial intelligence techniques are also being applied to analyze the large amounts of data collected from these sensors, enabling early and reliable detection of thermal runaway. The continuous research and development of lithium - ion battery thermal runaway monitoring technologies are crucial for enhancing the safety of lithium - ion batteries and promoting their wider adoption in various applications, from electric vehicles to energy storage systems.
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