基于空耦超声的聚合物锂离子电池缺陷检测  

Defect detection of polymer Li-ion battery based on air-coupled ultrasonic

作　　者：张曼 王明泉[1] 杨顺民[1] 方子彬 ZHANG Man;WANG Ming-quan;YANG Shun-min;FANG Zi-bin(School of Information and Communication Engineering,North University of China,Taiyuan,Shanxi 030051,China)

机构地区：[1]中北大学信息与通信工程学院,山西太原030051

出　　处：《电池》2020年第2期196-199,共4页Battery Bimonthly

基　　金：山西省国际科技合作项目(201803D421032)。

摘　　要：用具有非接触、非破坏和非浸入等特点的空气耦合超声对软包聚合物锂离子电池中的气泡进行检测。利用空耦超声垂直透射法,采用400 k Hz的圆形空耦聚焦探头,针对厚度为3 mm聚合物锂离子电池中的Φ=4.0 mm、5.0 mm、6.0 mm、7.2 mm和7.8 mm以及长径27.0 mm、短径3.5 mm等气泡进行265 mm×365 mm范围的C扫成像。声波遇到电池气泡缺陷时,振幅从0.38 v降为0.16 v。空气耦合超声无损检测技术可以对锂离子电池进行检测,并能准确检测出气泡的分布位置及外部未能分辨出的深浅不一的气泡缺陷。直径为4.0 mm的自然气泡缺陷能被准确检测出,相对误差低于5.5%。Air-coupled ultrasound with non-contact,non-destructive,non-immersion and other characteristics was used to detect the bubbles in the soft-package polymer Li-ion battery.A 400 k Hz circular air-coupled focusing probe was used to perform a C-scan imaging of 265 mm×365 mm for bubbles of Φ = 4.0 mm,5.0 mm,6.0 mm,7.2 mm and 7.8 mm,a bubble which long diameter of27.0 mm and short diameter of 3.5 mm in a 3 mm polymer Li-ion battery with air-coupled ultrasonic vertical transmission method.The amplitude was reduced from 0.38 v to 0.16 v when the battery bubble defect was encountered by sonic wave.Aircoupled ultrasonic non-destructive testing technology could detect Li-ion battery and could accurately detect the distribution position of bubbles and bubble defects of different depths that could not be distinguished from the outside.The natural bubble defect with a diameter of 4.0 mm could be accurately detected with a relative error less than 5.5%.

关 键 词：软包装聚合物电池 空气耦合超声 缺陷 C扫描 

分 类 号：TM912.9[电气工程—电力电子与电力传动]