| Title |
Systematic Approach of Internal Parameters for Equivalent Electrical-Circuit Modeling(EECM) of a Li4Ti5O12(LTO) cell |
| Authors |
Pyeong-Yeon Lee ; Chang-O Yoon ; Jin-Hyeong Park ; Jonghoon Kim |
| DOI |
https://doi.org/10.6113/TKPE/2018.23.3.174 |
| Keywords |
LTO(Li4Ti5O12) ; EECM(Equivalent Electrical-Circuit Model) ; Internal parameters |
| Abstract |
This study introduces a systematic approach to selecting the internal parameters applied to the equivalent electrical-circuit model (EECM) of a lithium titanium oxide (Li4Ti5O12; LTO) rechargeable cell. Based on the dynamic characteristic of the cell, a simplified EECM consisting of an open-circuit voltage (OCV), an ohmic resistance, and an RC ladder is fabricated. To select the internal parameters of a simplified EECM, experiments on discharge capacity, OCV, and discharge/charge resistances are performed using hybrid pulse power characterization and direct current internal resistance (DCIR) measurements over the full state-of-charge (SOC) range. The experimental results of the LTO rechargeable cell highlight the importance of correct selection of internal parameters that can reduce EECM errors. This study clearly provides experimental procedures, internal parameters results, and EECM guidelines for adaptive control-based SOC estimation for LTO rechargeable cells. |