Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (6): 1995-2009.doi: 10.19799/j.cnki.2095-4239.2024.0101

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

Accurate typical gas detection of lithium battery in early thermal runaway period

Baoquan LIU(), Xiaoyu CAO   

  1. School of Electrical and Control Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
  • Received:2024-02-01 Revised:2024-03-01 Online:2024-06-28 Published:2024-06-26
  • Contact: Baoquan LIU E-mail:liubq@sust.edu.cn

Abstract:

Lithium battery energy storage plays a crucial role in harnessing new energy for power generation and achieving the national "dual-carbon" objectives. This technology is indispensable for ground-based, industrial, and commercial energy-storage applications. A critical aspect of its widespread adoption is ensuring the safety of lithium batteries against thermal runaway and fire hazards. To this end, early detection of gases typically released during the thermal runaway phase of a lithium battery is essential for fire warning in energy storage. However, accurately identifying these gases poses challenges in environments with mixed gases owing to cross-interference from data collected by various gas sensors. Such interferences often lead to inaccurate detections, delayed or false alarms, and potential fire hazards. To address these issues, we propose a decoupling method designed to enhance the precision of detecting typical gases, namely H2 and CO concentrations, in mixed gas environments. This method involves establishing response models for each sensor in different single-gas environments and understanding the cross-coupling relationships between different gases and sensors. By deriving the relationship between the sensor signals and the gas components and concentrations in mixed-gas scenarios, we can establish an equation system. This system is crucial for obtaining precise concentration data for each gas, thus facilitating the decoupling of sensor data. In experimental testing with a mixed gas scenario of H2 and CO, which was built to simulate the early gas environment of lithium battery thermal runaway across different chemical systems and different states of charge. The results demonstrated a detection error of less than 50 mL/m3 within the concentration range of 0—1000 mL/m3. The maximum improvement in detection accuracy reached 15%, validating the effectiveness of the proposed method outlined in this study.

Key words: lithium battery energy storage, thermal runaway, gas detection, cross interference, data cross decoupling algorithm

CLC Number: