Predictive Modeling of Creep Driven Pore Growth under Cyclic High Temperature Tooling Loads
Predictive creep modeling quantifies elevated temperature pore evolution in solid state cell tooling to establish precise hold times and prevent yield loss.
Shear Strain Rate
Meaning
Fluid shear kinetics describe the velocity gradient established across fluid layers during high-speed slurry mixing, slot-die coating, and electrolyte injection. Shear strain rate measures the time rate of deformation when viscous battery slurries undergo hydrodynamic stress inside mixing equipment and delivery nozzles. The variable governs shear-thinning viscosity behavior, agglomerate breakup efficiency, and wet film coating thickness uniformity.
It ceases to apply once fluid motion stops and the slurry transitions into a static viscoelastic gel or dried solid layer.
Rheological Dynamics
High velocity gradients generated inside mixing vessels break apart carbon black agglomerates and distribute active material particles uniformly. Applying a precise shear strain rate during slot-die delivery temporarily lowers slurry viscosity to ensure smooth, streak-free wet film application. Polymer binder chains align under fluid stress, promoting uniform binder distribution across the current collector surface.
Incorrect shear conditions lead to particle sedimentation, film edge heavy ridges, or air bubble entrapment during coating operations.
Viscous Flow
Fluid viscosity decreases predictably as mechanical deformation speed increases during slot-die extrusion. Understanding non-Newtonian flow behavior prevents fluid breakdown and maintains stable delivery pressure at high line speeds.
Dispersion Stability
Controlled fluid friction prevents particle re-agglomeration during transfer from hold tanks to coating heads. Uniform particle suspension maintains tight mass loading tolerances across continuous production runs.