在离子电池循环期间内部温度演变的现场光纤传感
Fanchao Zeng1, Xinglin Tong1, Chong Xu2
1National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China.
ACS omega
|October 20, 2025
概括
阵列纤维布拉格格传感器 (AFBGs) 能够实时监测离子电池 (LiBs) 的内部温度,这对于早期热失控检测和电池管理系统集成至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 储能 储能 储能 储能 储能 储能
背景情况:
- 内部温度监测对于防止高容量离子电池 (LiBs) 的热失控至关重要.
- 现有的外部传感器无法捕捉实时内部温度分布,阻碍了热事件的早期检测.
- 阵列纤维布拉格格传感器 (AFBGs) 为多点内部温度传感提供了一个潜在的解决方案.
研究的目的:
- 调查AFBGs在LiBs的不同部分持续监测内部温度的有效性.
- 在运行过程中评估热梯度并识别 LiB 电池内的温度敏感位置.
- 评估AFBGs在早期热失控检测和与电池管理系统 (BMS) 集成方面的潜力.
主要方法:
- AFBGs被放置在LiB细胞之间,以监测不同速率 (0.2,0.5,0.75 P) 的充放电周期中的温度分布.
- 内部温度数据与外部传感器读数进行了比较,以量化低估.
- 使用线性回归分析将内部温度与电荷-放电率相关联.
- 传感器的稳定性和与电池生产的兼容性在500个循环中进行了评估.
主要成果:
- 在细胞的垂直轴上观察到高达6.8°C的最大热梯度,果卷中心是最敏感的.
- 在充电过程中,在一个包中的电池中观察到8.3°C的温度差异,表明热不均.
- 外部传感器平均低估了19.4°C的内部温度.
- 在最大内部温度和电荷-放电率之间发现了强烈的线性相关性 (R2 = 0.999).
- AFBGs在500个循环中表现出稳定性和与电池制造的兼容性.
结论:
- 使用AFBG的多点内部温度监测对于早期检测LiBs的热失控是必不可少的.
- AFBG传感为了解电池组内的热梯度和不均性提供了关键数据.
- 温度和电荷放电率之间的强烈相关性使得通过BMS能够进行预测监测.
- AFBGs为LiBs的长期内部温度监测提供了可靠和兼容的解决方案.
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