DSFB Structural Semiotics Engine for Battery Health Monitoring: A Deterministic Early-Warning Framework for Capacity Fade, Internal Resistance Drift, and Knee-Onset Detection in Safety-Critical Energy Storage Systems

We present a deterministic residual-structure signal for lithium-ion battery health monitoringand evaluate it on the NASA PCoE battery aging dataset (cell B0005). The signal indicates atransition region at cycle 38, compared to cycle 79 for a standard 85% capacity threshold andcycle 101 for end-of-life (80%), corresponding to a 41-cycle lead relative to threshold crossing.The signal remains elevated over multiple cycles, indicating sustained structural change ratherthan a transient fluctuation. Results are reproducible using the accompanying dsfb-batterycrate and notebook.This work illustrates, on a real NASA PCoE battery trajectory under a fixed and reproducibleconfiguration, that the DSFB (Drift-Slew Fusion…