SYSTEMS AND METHODS FOR BATTERY CELL DEGRADATION DETECTION

Methods and systems are provided for a high-voltage multi-array battery of a plug-in vehicle. In one example, a method may include monitoring a rate of change of a difference in a maximum cell voltage deviation for at least one array of cells of the high-voltage multi-array battery exceeding a predetermined threshold. In response to the rate of change exceeding the predetermined threshold, plug-in charging is aborted and a diagnostic trouble code (DTC) is recorded in a memory of the vehicle.