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.
Thermal Tooling Expansion
Meaning
Nominal ambient room dimensions set the baseline against which high-temperature press plates and sealing dies expand during heated calendering and thermal tab welding. Thermal tooling expansion measures the dimensional drift of metal plates, ceramic dies, and heating blocks as operating temperatures rise. The property governs mechanical gap clearances, thermal compression accuracy, and seal width repeatability in pouch cell sealing processes.
It stops applying when the tooling system reaches thermal equilibrium or cools back to ambient calibration temperatures.
Dimensional Drift
Temperature increases during heated pressing operations cause metallic heating plates to expand linearly in all directions. Accounting for thermal tooling expansion prevents dimensional mismatch between heated upper platens and cooled lower support frames. Uncorrected expansion changes tool clearances, leading to uneven pouch seal thickness, localized film pinch-off, or incomplete thermal welding.
Tooling designs incorporate expansion slots, thermal isolation breaks, and active cooling channels to maintain physical alignment at operating temperatures.
Expansion Coefficient
Material selection for high-temperature sealing jaws balances thermal conductivity against coefficient of thermal expansion. Low-expansion alloys reduce positional drift during continuous heat-sealing cycles on pouch cell manufacturing lines.
Seal Precision
Consistent mechanical gap dimensions maintain uniform heat transfer and pressure application along pouch cell perimeter seals. Precise sealing prevents electrolyte leakage and moisture ingress over cell operating lifetimes.