基于脉冲红外热成像技术的锂电池端盖焊接质量检测

洪颖; 安伟; 江海军; 张凯; 陈飞

基于脉冲红外热成像技术的锂电池端盖焊接质量检测

洪颖¹,
安伟¹,
江海军^2, ,,
张凯²,
陈飞²

1.
金陵海关技术中心, 江苏南京 210014
2.
南京诺威尔光电系统有限公司, 江苏南京 210014

基金项目:

南京海关科研项目 2022KJ32

详细信息

作者简介:
洪颖（1980-），汉，女，博士，研究员，研究方向：机电产品质量及能效的检测技术研究

通讯作者:
江海军（1988-），汉，男，硕士，高级工程师，研究方向：红外无损检测技术及图像处理。E-mail：hjiang@novelteq.com

中图分类号: TM911
计量
- 文章访问数: 33
- HTML全文浏览量: 9
- PDF下载量: 11
- 被引次数: 0
出版历程
- 收稿日期: 2022-06-24
- 修回日期: 2022-07-20
- 刊出日期: 2023-10-20

Welding Quality Inspection for Explosion-proof Sheet of Lithium Battery Based on Pulsed Infrared Thermography

1.
Jinling Customs Technical Center, Nanjing 210014, China
2.
Novelteq Ltd., Nanjing 210014, China

摘要

摘要: 锂电池端盖作为保障锂电池安全的关键部件，端盖是一种铝制的薄片，采用激光焊接工艺，焊接过程中容易造成焊穿孔、断焊、虚焊的现象，目前主要依靠目视检测、可见光图像检测，但上述检测方式不能检测出虚焊问题。本文使用脉冲红外热成像技术对激光焊接进行检测，制作了焊接率为100%、50%、33%、25%共4个试件，采用信号重建方法可以消除试件表面不匀的影响，一阶导图像可以看到焊接区域，焊接率越大，焊接区域亮斑越大；对图像进行二值分割，结果表明激光焊接率和检测面积成正相关线性关系，验证了脉冲红外热成像技术对锂电池端盖焊接质量检测的有效性，为锂电池端盖焊接质量检测提供了一种新方法。
- 脉冲红外热成像 /
- 锂电池 /
- 端盖 /
- 激光焊接 /
- 焊接检测
Abstract: Explosion-proof sheets are key components in ensuring the safety of lithium batteries. These aluminum sheets easily cause welding perforations, broken welding, and false welding during the welding process using laser welding technology. Presently, inspection mainly relies on visual inspection and visible light image detection; however, these detection methods cannot detect faulty welding. Here, we propose a pulsed infrared thermography technology to detect laser welding defects. Four specimens with welding ratios of 100, 50, 33, and 25% were fabricated. The signal reconstruction method eliminates the influence of the uneven surface of the specimen. It is shown that the larger the welding percentage, the larger the bright spot in 1D images of the welding area. The binary segmentation of the 1-D image indicated that the laser welding percentage and detection area have a positive linear correlation, which verifies the effectiveness of the pulsed infrared thermal imaging technology for lithium battery explosion-proof sheet welding quality inspection, providing a new method for detecting the welding quality of lithium battery explosion-proof sheets.
- pulsed infrared thermography /
- lithium battery /
- explosion-proof sheet /
- laser welding /
- welding quality detection

HTML全文

图 1 脉冲红外热成像系统示意图

Figure 1. Schematic diagram of pulsed infrared thermography system

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图 2 脉冲红外热成像技术采集过程示意图

Figure 2. Schematic diagram of acquisition process of pulsed infrared thermography

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图 3 端盖照片

Figure 3. Photo of explosion-proof sheet

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图 4 试件-端盖喷漆后效果

Figure 4. Specimen-effect of explosion-proof sheet after painting

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图 5 脉冲红外热成像系统

Figure 5. Pulsed infrared thermography system

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图 6 试件2#温度-时间曲线

Figure 6. Temperature-time curves of specimen 2#

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图 7 试件2#红外序列图像

Figure 7. Infrared sequence image of specimen 2#

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图 8 红外检测图像（0.08 s）

Figure 8. Infrared detection image(0.08 s)

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图 9 一阶导数图像（0.08 s）

Figure 9. Infrared first derivative image(0.08 s)

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图 10 空间曲线

Figure 10. Spatial curves

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图 11 双阈值分割效果

Figure 11. Double threshold segmentation effect

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图 12 激光焊接率和检测区域面积曲线

Figure 12. Laser welding ratio and welding area curve

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参考文献(16)

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