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首页> 外文会议>Charging amp; infrastructure symposium 2018 >Deduction of an Evaluation Process for the Optical Characterization of the Macroscopic Electrolyte Distribution in Lithium-Ion Batteries
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Deduction of an Evaluation Process for the Optical Characterization of the Macroscopic Electrolyte Distribution in Lithium-Ion Batteries

机译：推导锂离子电池中宏观电解质分布的光学表征评估过程

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The electrolyte filling and wetting process of a Lithium-Ion Battery (LIB) constitutes the interface between cell assembly and formation. The filling step offers a high potential to increase throughput and to reduce both material and production costs. Despite this potential, research activities in this field are observed rarely only. Not Even the influence of filling parameters on electrochemical performance has been studied sufficiently yet. Anyway, for the filling procedure best practice solutions are available. However, it is unknown which processes dominate the filling and wetting behavior and how to accelerate them. Studies have shown that, the best results are achieved by gradually filling the cell in a vacuum chamber under low pressure conditions. First, it is necessary to avoid gas inclusions between the sheets and inside the pore structure. Second, it is important to achieve homogeneous distribution of electrolyte on the macroscopic and the microscopic scale. These effects influence the battery performance in a negative way, because they cause less wetted and hence inactive areas. In order to avoid such inhomogeneous electrolyte distribution, both phenomena need to be researched. The goal of this investigation was to deduct an evaluation process for the optical characterization of the macroscopic electrolyte distribution in lithium-ion batteries. Therefore, transparent cells were designed, manufactured and finally filled in a vacuum chamber. In order to produce transparent battery cases, a number of different polymer materials had to be tested. This due to the requirements that the polymer material needs to retain its high transparency even under contact with electrolyte. The camera which had to be placed inside the pressure chamber was enclosed in a pressure protective case. The video material was analysed with MATLAB and its image processing toolbox. Histograms, different colormaps, edge detection and thresholding techniques were utilized for pre- and processing operations which allowed further investigation of the received footage, i.e. contrast adjustment to improve visual conditions. The presented poster shows the first results of the elaborated evaluation process for the optical characterization of the macroscopic electrolyte distribution. Gas inclusion as a result of the filling process could be identified by a Sobel filter and a routine to evaluate the average area of gas inclusions of different time stamps was established. Further investigations are necessary to detect the microscopic electrolyte distribution. This visualization correlated with evaluation routine is necessary to avoid gas inclusions on a macroscopic scale. As a result, this study provides the first steps for quality control during the filling process within lithium ion battery production.
机译：锂离子电池（LIB）的电解液填充和润湿过程构成了电池组装与形成之间的界面。填充步骤具有增加生产量并降低材料和生产成本的巨大潜力。尽管具有这种潜力，但很少会观察到该领域的研究活动。还没有充分研究填充参数对电化学性能的影响。无论如何，对于灌装程序，可以使用最佳实践解决方案。但是，尚不清楚哪个过程主导着填充和润湿行为以及如何加速它们。研究表明，通过在低压条件下在真空室中逐渐填充电池，可以获得最佳结果。首先，有必要避免片材之间和孔结构内部的气体夹杂。其次，重要的是在宏观和微观尺度上实现电解质的均匀分布。这些影响会对电池性能产生负面影响，因为它们会导致较少的湿润区域，因此不会形成活动区域。为了避免这种不均匀的电解质分布，两种现象都需要研究。这项研究的目的是为锂离子电池中的宏观电解质分布的光学表征推导评估过程。因此，设计，制造透明电池并最终将其填充到真空室中。为了生产透明的电池盒，必须测试许多不同的聚合物材料。这是由于要求聚合物材料即使在与电解质接触下也需要保持其高透明性。必须放置在压力室内的摄像机被封闭在压力保护盒中。使用MATLAB及其图像处理工具箱对视频材料进行了分析。直方图，不同的颜色图，边缘检测和阈值处理技术被用于预处理和处理操作，从而可以进一步研究接收到的素材，即通过对比度调整来改善视觉条件。所展示的海报显示了用于宏观电解质分布的光学表征的详细评估过程的初步结果。可以通过Sobel过滤器识别由于填充过程而产生的气体夹杂物，并建立了评估不同时间戳的平均气体夹杂物面积的程序。有必要进行进一步的研究以检测电解质的微观分布。这种与评估程序相关的可视化对于避免宏观范围内的气体夹杂是必要的。因此，本研究为锂离子电池生产中的填充过程中的质量控制提供了第一步。

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  • 会议地点 Mainz(DE)
  • 作者

    Antje Schilling; Christian Schroeder; Franz Dietrich; Klaus Droeder;

  • 作者单位

    Technical University Braunschweig, Institute for Machine Tools and Manufacturing Technology, Langer Kamp 19b, Braunschweig, D-38106 Germany;

    Technical University Braunschweig, Institute for Machine Tools and Manufacturing Technology, Langer Kamp 19b, Braunschweig, D-38106 Germany;

    Technical University Braunschweig, Institute for Machine Tools and Manufacturing Technology, Langer Kamp 19b, Braunschweig, D-38106 Germany;

    Technical University Braunschweig, Institute for Machine Tools and Manufacturing Technology, Langer Kamp 19b, Braunschweig, D-38106 Germany;

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