In a recent publication in the Journal of Power Sources, the Chair of Automotive Technology at TUM analyzes the impedance relaxation behavior of lithium-ion cells following defined discharge procedures. The study investigates the impact of state of charge (SoC), depth of discharge (DoD), and realistic discharge profiles on impedance over relaxation periods of up to 46 hours.
The findings show that higher DoD leads to more significant impedance changes, while the smallest variation occurs at 50% SoC. Additionally, discharge history—especially the final phase before cut-off—has a major influence on relaxation behavior. These insights are key to improving battery diagnostics in real-world automotive applications.
🔗 Read the study: https://doi.org/10.1016/j.jpowsour.2025.237690