Meaning
A diagnostic measurement metric defines the smallest spatial interval at which localized mechanical deformation and expansion gradients can be distinguished along a battery cell or electrode surface. Achieving fine localized strain resolution enables sensor networks to pinpoint micro-swelling and internal gas pockets before macroscopic volume changes manifest. Scope is bounded by the physical gauge length and spacing of embedded fiber optic sensors, excluding full-pack displacement sensors.
Measurement fidelity dictates sensor layout parameters for module health monitoring systems.
Spatial Sensitivity
Fiber Bragg grating spacing determines the spatial density of strain measurement points along an optical sensing fiber. High spatial density resolves micro-scale deformation gradients across localized electrode regions. Fine resolution prevents localized mechanical hot spots from being smoothed out by spatial averaging.
Focal Detection
Optoelectronic interrogators process reflected light signals to identify strain concentrations within sub-millimeter zones. Algorithms convert spectral shifts into discrete mechanical strain values at each node. Accurate focal detection identifies local swelling caused by non-uniform lithium insertion.
Deformation Profiling
Mapping local mechanical variations reveals structural anomalies caused by thermal gradients or pressure imbalances. High localized strain resolution provides early warning of mechanical battery failure during rapid charging. Detailed spatial profiles inform battery casing design and compression pad selection.
