Uporaba elektrokemijske impedančne spektroskopije za oceno kakovosti električnih vpetij pri merjenju impedance litij-ionskih baterij

Matičič, Aljoš (author), Zelič, Klemen (mentor), Katrašnik, Tomaž (comentor)

V delu je analiziran vpliv različnih baterijskih vpetij na rezultate meritev elektrokemijske impedančne spektroskopije litij-ionskih baterij. Meritve so bile izvedene na imitacijski in baterijski celici s tremi različnimi vpetji. Z odštevanjem impedance imitacijske celice od baterijske je bilo mogoče oceniti vpliv vpetja na meritve ter hkrati izolirati impedanco baterijske celice. Rezultati potrjujejo, da imajo baterijska vpetja lahko pomemben vpliv na impedančni odziv, zlasti pri višjih frekvencah.

• Language: Slovenian
• Keywords: elektrokemijska impedančna spektroskopija (EIS), litij-ionska baterija, baterijsko vpetje, imitacijska celica, kontaktni upor, Nyquistov diagram, merilni šum
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2025
• Number of pages: XII, 34 f.
• PID: 20.500.12556/RUL-171615
• UDC: 621.352:621.3.011.7:543.42(043.2)
• COBISS.SI-ID: 250233603
• Publication date in RUL: 29.08.2025

Secondary language

• Language: English
• Title: Application of electrochemical impedance spectroscopy for assessing the quality of electrical connections in lithium-ion battery impedance measurements

Abstract

This work analyzes the influence of different battery fixtures on the results of electrochemical impedance spectroscopy measurements of lithium-ion batteries. Measurements were performed on both a dummy and a real battery cell using three different battery fixtures. By subtracting the impedance of the dummy cell from that of the battery cell, it was possible to assess the influence of the fixture on the measurement and simultaneously isolate the impedance of the battery cell. The results confirm that battery holders can significantly affect the impedance response, especially at higher frequencies.

• Keywords: electrochemical impedance spectroscopy (EIS), lithium-ion battery, battery fixture, dummy cell, contact resistance, Nyquist plot, measurement noise