OCV aging

OCV Aging refers to the phenomenon where the open circuit voltage (OCV, Open Circuit Voltage) – state of charge (SOC) relationship curve of the battery drifts or distorts due to electrochemical reactions, side reactions, or structural changes during long-term use or storage. This is a slow process of performance degradation, which has an important impact on the state of charge estimation and health status judgment in the battery management system (BMS).
Main manifestations
Under the same SOC, the OCV value after aging is either higher or lower;
The slope of the OCV-SOC curve changes, It is particularly obvious in the high SOC or low SOC areas.
The OCV-SOC curves of batteries at different aging stages appear misaligned or overlapping inconsistently.