Research on active/passive energy dissipation control method for thermal protection of ammunition battery

Abstract

High-temperature excitation is the main hazard affecting ammunition safety, and thermal protection technology for batteries inside ammunition is important for enhancing ammunition safety. This study proposes a design integrating a MEMS bistable actuator and battery, and constructs a parallel energy interface between the two. The US military's insensitive ammunition fast cook-off test is then used to verify this design. When the driving current of the MEMS bistable actuator reaches 0.032 A, the actuator completes its own “OFF–ON” electrical conversion, achieving dissipation of the ammunition battery energy. The conformal design of aluminum–silicon aerogel and ammunition forms an energy coupling relationship between thickness and heat transfer efficiency, which reduces the heating rate of the battery in the ammunition. When the material thickness is 5 mm, the internal temperature of the ammunition is 435.5 K after 1200 s of heating, whereas the temperature reaches 423 K within 37 s without protection. The MEMS bistable actuator and aluminum–silicon aerogel realize active/passive thermal protection of the battery and provide technical references for improving ammunition safety.