Development of Metallic Contaminant Inspection System Using High-Tc rf-SQUID for Li-ion Battery Liquid Components
Development of Metallic Contaminant Inspection System Using High-Tc rf-SQUID for Li-ion Battery Liquid Components
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锂离子电池液体成分高温rf-SQUID金属污染物检测系统的开发
DOI：
10.1109/tasc.2020.2986315
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
and Takeyoshi Ohtani
中科院分区：
文献类型：
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作者：
Saburo Tanaka;Masaru Sagawa;Kanji Hayashi;and Takeyoshi Ohtani
提出了一种利用高温超导射频量子干涉仪（SQUID）检测锂离子电池液体成分的方法。在制造过程中，少量的金属可能会混入锂离子电池的组件中并污染它们，从而导致火灾风险，因此，需要开发高灵敏度的检测系统。在这篇文章中，我们描述了一个测试系统，我们开发了一个单通道高温超导rf-SQUID组成的低温恒温器，聚乙烯管，和一个永久磁铁。SQUID需要安装在尽可能靠近电池液体的地方，以获得更灵敏的读数。因此，我们设计了一种显微镜型SQUID低温恒温器，其中SQUID可以接近目标为1毫米。在该系统中，液体不流过聚乙烯管，但一个小的金属样品堆上的鱼线由电机移动。制备了标称尺寸为φ50 μm的不锈钢切割丝。在磁化样品后，通过SQUID测量样品的杂散磁场。峰-峰信号与间隔距离的立方成反比。实验结果表明，当信噪比（SNR）> 3时，在26 mm距离上可以检测到φ50 μm的样品信号。还研究了不同尺寸（φ50 ~ φ160 μm）不锈钢试样的抗拉强度与试样尺寸的关系。峰-峰信号与直径的立方成比例。
The use of a high-Tc (HTS) rf-superconducting quantum interference device (SQUID) for inspecting the liquid component of lithium-ion (Li-ion) batteries is proposed. It is possible that a small amount of metal can become mixed in with components of Li-ion batteries during the manufacturing process and contaminate them, with a resultant fire risk, Thus, the development of a highly sensitive inspection system is required. In this article we describe a test system, we developed using a single channel HTS rf-SQUID consisting of a cryostat, a polyethylene tube, and a permanent magnet. The SQUID needs to be installed as close to the battery liquid as possible to obtain more sensitive readings. Therefore, we designed a microscope-type SQUID cryostat in which the SQUID can approach the target as close as 1 mm. In the system, the liquid was not flowed through the polyethylene tube, but a small metallic sample stack on a fishing line was moved by a motor. A stainless steel cut wire with a nominal size of φ50 μm was prepared. After magnetizing the sample, the stray magnetic field of the sample was measured by the SQUID. The peak-to-peak signal scaled inversely with the cube of the stand-off distance. It was found that a signal of the sample with φ50 μm at a distance of 26 mm could be detected if the signal-to-noise ratio (SNR) > 3 was supposed as the threshold of the inspection. The dependence on the sample size was also investigated, using stainless steel samples with different sizes (φ50-φ160 μm). The peak-to-peak signal scaled with the cube of the diameter.