Electrochemical energy storage stations serve as an important means of load regulation, and their proportion has been increasing year by year. The temperature monitoring of lithium batteries necessitates heightened criteria. Ultrasonic thermometry, based on its noncontact measurement characteristics, is an ideal method for monitoring the internal temperature of lithium batteries. In this study, temperature and ultrasonic time delay measurement experiments were conducted on 18650 lithium batteries and laminated and wound lithium batteries to obtain the corresponding relationship between temperature and time delay and validate the temperature measurement for the same type of battery. The experimental results show that (1) the ultrasonic temperature measurement technique exhibits a relatively large error when used for 18650 Li-ion batteries under experimental conditions; (2) in the experiments on laminated and wound soft-pack lithium batteries, the relationship between temperature and time delay exhibits a nonlinear characteristic; and (3) under the experimental conditions, the ultrasonic temperature measurement errors were ±1.1 °C for stacked Li-ion batteries and ±1.4 °C for wound Li-ion batteries.

中文翻译：

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基于超声波技术的锂电池温度实时监测

电化学储能电站作为负荷调节的重要手段，其比例逐年增加。锂电池的温度监测需要提高标准。超声波测温因其非接触式测量特性，是监测锂电池内部温度的理想方法。本研究对18650锂电池和叠层、卷绕锂电池进行温度和超声波延时测量实验，得到温度与延时的对应关系，验证了同类型电池的温度测量。实验结果表明：（1）超声波测温技术在实验条件下用于18650锂离子电池时存在较大误差； (2)在叠层和卷绕软包锂电池的实验中，温度与延时的关系表现出非线性特性； (3)在实验条件下，叠层锂离子电池超声波测温误差为±1.1℃，卷绕锂离子电池超声波测温误差为±1.4℃。