论文标题
在机械滥用下，锂铁磷酸电池的尺寸依赖性故障行为
Size-dependent Failure Behavior of Lithium-Iron Phosphate Battery under Mechanical Abuse
论文作者
论文摘要
在机械滥用条件下，锂离子电池的故障发生在不同的阶段，其特征是不同的力，温度和电压响应，需要进行分析的原位测量。首先，四个尺寸的市售锂磷酸锂电池（LFPB）。 18650，22650，26650和32650受到准静态侧向，纵向压缩和指甲穿透测试。在第一个内部短路（ISC）发作时，以电压下降和温度升高为特征的故障分别通过基于Aurdino的电压传感器模块和温度测量模块来识别。 ISC发作时的电池故障负载和峰值温度强烈依赖于电池尺寸。与纵向压缩和指甲穿透试验不同，在横向压缩过程中，观察到故障在18650电池中被延迟。在短路开始时，对于不同的LFPB，温度升高以上是环境值的不同。在纵向压缩和最小值（29.5度C）下，在所考虑的几何形状之间，在纵向压缩和最小（29.5度C）下，LFPB 32650的最大（64.4度C）是最大的（64.4度C）。此外，LFPB 26650在被考虑的滥用条件下表现出平衡的热行为。可以及时了解此类数据，以有效地进行热管理和改善锂离子电池的安全性。
Under mechanical abuse conditions, the failure of lithium-ion batteries occurs in various stages characterized by different force, temperature and voltage response which require it's in-situ measurements for analysis. Firstly, four sizes of commercially available lithium-iron phosphate batteries (LFPB) viz. 18650, 22650, 26650, and 32650 are subjected to quasi static lateral, longitudinal compression, and nail penetration tests. The failure, characterized by the voltage drop and temperature rise, at the onset of the first internal short-circuit (ISC), is identified by Aurdino-based voltage sensor module and temperature measurement module, respectively. The battery failure load and peak temperature at the onset of ISC are found to rely on the battery size strongly. The failure is observed to be delayed for small-sized 18650 batteries during lateral compression, unlike longitudinal compression and nail penetration test. At the onset of the short circuit, the temperature rise above the ambient value is different for different LFPBs. It is found to be maximum (64.4 degree C ) for LFPB 32650 under longitudinal compression and minimum (29.5 degree C) under lateral compression tests amongst the considered geometries. Further, LFPB 26650 exhibited a balanced thermal behavior during the considered abused condition. Such data can be sensed timely for effective thermal management and improved safety of lithium-ion batteries.
