Early Detection System of LiSB Deterioration by Current Interrupt Method

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06681
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Energy engineering
• Research Institution: Yamagata University
• Principal Investigator: Nishina Tatsuo 山形大学, 大学院理工学研究科, 教授 (60172673)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 電気自動車 / リチウムイオン二次電池 / 電流遮断法 / 2段分布定数回路 / マイクロショート / 金属リチウム析出 / 劣化診断 / インピーダンス

Outline of Final Research Achievements

Mathematical modelling of overvoltage relaxation and EIS response for batteries has been carried out by applying dual transmission line as an equivalent circuit of electrode for commercially available batteries. Derived functions were quite complicated. However, we succeeded to express the overvoltage relaxation after current interruption and the EIS spectra. For the EIS spectra, the increase of real part impedance at lower frequency range than 1 mHz was successfully obtained by applying dual transmission line model. For the overvoltage relaxation, we succeeded to obtain the accurate response within a 1 mV residuals for 10 minutes relaxation by simply connecting two dual transmission line in series.

Free Research Field

電気化学