| Title |
Enhancing Fast-charging Capability in Lithium-ion Batteries through the Implementation of Separate Voltage Taps Independent of Current Application Taps |
| Authors |
황승혜(Seunghae Hwang) ; 신경희(Kyung-Hee Shin) ; 진창수(Chang-Soo Jin) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.12.1740 |
| Keywords |
Accuracy of Measurement; Fast Charging; IR Rise; Lithium-ion Batteries; Taps. |
| Abstract |
This article presents an innovative tap design aimed at enhancing the fast-charging capabilities of lithium-ion batteries. In conventional lithium-ion battery designs with two taps, the application of current and voltage measurement occurs at the same tap, leading to a rapid increase in voltage due to the high charging current in close proximity. This phenomenon causes a swift transition to the voltage cut-off region before achieving a uniform state-of-charging (SOC) in the electrode, resulting in a reduction in charging capacity.
To address this issue, a novel approach is introduced where the current application tap and voltage measurement tap are physically separated using four taps. These specially designed taps enable more accurate voltage measurement across the entire electrode compared to the traditional two-tap system. By preventing a premature transition to the constant voltage (CV) region, this design prolongs the constant current (CC) region, characterized by higher current density than the CV region. As a result, this approach demonstrates a 16.8% increase in charging capacity, even under a fast-charging condition with a 10.0 current rate (C-rate), compared to the traditional system. |