在商用 18650 离子电池中直接测量内部温度
Casey M Jones1, Meghana Sudarshan1, R Edwin García2
1School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN, 47907, USA.
Scientific reports
|September 2, 2023
概括
研究人员开发了一种将温度传感器插入离子电池的方法. 这种修改允许准确的内部温度监测,这对于了解电池退化和安全至关重要.
科学领域:
- 电池技术 电池技术
- 电化学 储能 储能 电化学 储能
- 热管理系统 热管理系统
背景情况:
- 内部温度监测对于了解离子电池 (LIB) 的行为至关重要,包括加热,降解和热失控.
- 目前用于内部温度评估的方法有限,阻碍了对电池性能和安全性的详细分析.
- 准确的内部温度数据对于开发先进的电池管理系统和确保运行安全至关重要.
研究的目的:
- 开发和验证一种将温度传感器插入商业 18650 离子电池的方法.
- 量化传感器插入对细胞性能和特性的影响.
- 评估内部温度数据对研究电池老化和热性行为的有用性.
主要方法:
- 采用了一种新的技术,将温度传感器集成到商业 18650 LIB 中.
- 特性测试,包括循环和阻力测量,在修饰细胞和对照细胞上进行.
- 在操作期间记录了内部和外部温度读数,以比较热行为.
主要成果:
- 传感器插入导致容量略有下降 (0.5-2.3%) 和直流电阻略有增加 (~15 mΩ).
- 修改后的细胞显示温度略高 (~0.5°C),但保持了与控制细胞相似的热趋势.
- 经过修改的电池提供了可靠的内部温度数据,在显著降解之前,最多为150个周期.
结论:
- 内部温度传感器可以成功地集成到LIB中,对性能的影响最小.
- 开发的方法可以直接测量电池内部温度,为热动力学提供了宝贵的见解.
- 这种技术适用于研究电池老化和热事件,在细胞中具有有限的前循环老化.
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