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首页> 外文期刊>Journal of Energy Storage >Local degradation and differential voltage analysis of aged lithium-ion pouch cells
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Local degradation and differential voltage analysis of aged lithium-ion pouch cells

机译：老化锂离子袋细胞的局部降解和差分电压分析

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摘要

Knowledge of the underlying degradation mechanisms in a lithium-ion cell is crucial for the development process and control of automotive lithium-ion battery packs. In this paper, a local post-mortem degradation analysis is performed on two differently cycled large-format pouch cells to improve the understanding of the underlying degradation mechanisms. For each cell, anode and cathode sheets are extracted and electrode coins are cut out from the sheets in an equally spaced, five-by-five pattern to assemble three-electrode test cells. Subsequently, the local capacities and differential voltage curves of the test cells are determined showing an inhomogeneous loss of lithium inventory for one cell and a capacity degradation of the cathode for the other cell. In a parallel connection of the test cells, the influence of the degradation mechanisms on the pouch cell's differential voltage curve is shown and an approach is validated for calculating the resulting differential voltage curve by superimposing the single measured curves. In addition, the local discharge resistance is evaluated, revealing for both aged cells that the measured resistance increase at pouch cell level is the result of an increased resistance of the cathode and a decreased anode resistance.
机译：知识锂离子电池中的潜在降解机制对于汽车锂离子电池组的开发过程和控制至关重要。本文在两种不同循环的大型袋细胞上进行了局部验尸降解分析，以改善对潜在的降解机制的理解。对于每个细胞，提取阳极和阴极片，并从纸张中以等间隔的五倍图案从片材中切出电极硬币以组装三电极测试电池。随后，确定测试电池的局部容量和差分电压曲线，显示用于一种细胞的锂库存的不均匀损失和用于其他细胞的阴极的容量劣化。在测试电池的并联连接中，示出了劣化机制对袋电池的差分电压曲线的影响，并且验证了通过叠加单个测量的曲线来计算所得到的差分电压曲线的方法。另外，评估局部放电阻力，揭示两种老年的细胞，使得袋细胞水平的测量电阻增加是阴极电阻增加的结果和降低的阳极电阻。

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  • 来源
    《Journal of Energy Storage》 |2020年第8期|101582.1-101582.17|共17页
  • 作者

    Sieg Johannes; Storch Mathias; Fath Johannes; Nuhic Adnan; Bandlow Jochen; Spier Bernd; Sauer Dirk Uwe;

  • 作者单位

    Mercedes Benz AG Res & Dev Neue Str 95 D-73230 Kirchheim Unter Teck Germany;

    Mercedes Benz AG Res & Dev Neue Str 95 D-73230 Kirchheim Unter Teck Germany;

    Mercedes Benz AG Res & Dev Neue Str 95 D-73230 Kirchheim Unter Teck Germany;

    Mercedes Benz AG Res & Dev Neue Str 95 D-73230 Kirchheim Unter Teck Germany;

    Mercedes Benz AG Res & Dev Neue Str 95 D-73230 Kirchheim Unter Teck Germany;

    Mercedes Benz AG Res & Dev Neue Str 95 D-73230 Kirchheim Unter Teck Germany;

    Rhein Westfal TH Aachen Inst Power Elect & Elect Drives ISEA Electrochem Energy Convers & Storage Syst Grp Jagerstr 1719 D-52066 Aachen Germany|JARA Energy Julich Aachen Res Alliance Julich Germany|Forschungszentrum Julich Helmholtz Inst Munster HI MS D-52425 Julich Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lithium-ion; Differential voltage; Local degradation analysis; Inhomogeneous aging; Post-mortem analysis;

    机译：锂离子;差分电压;局部退化分析;不均匀的老化;后验证分析;

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