Impact behavior and structural design method of inertially activated thermal batteries

초록

Thermal batteriesareessential power sources for aerospace and defense sys-tems, where ensuring structural integrity under mechanical impact is critical. This is particularly important in inertia-activated cells that trigger thermochemical reactions using impact forces. This study investigates the behavior and safety of thermal batteries in high-G aerospace systems using LS-Dyna for explicit structural analysis and virtual drop test simulations. Two drop specifi-cations were analyzed to evaluate acceleration and impact duration across different drop heights and cell configurations. In the first case, peak acceleration reached 2074G during a 0.17ms drop. In the second, peak accelerations ranged from 1124G to 1967G with durations of 0.2-0.35ms. Results show an inverse correlation between peak acceleration and impact duration. The validated simulation model reduces repetitive physical testing, lowers costs, prevents com-ponent damage, and enables the exploration of additional drop scenarios for designing safer, more robust thermalbatteries.

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