The fire resistance and thermal propagation delay of a flame-retardant battery pack case (BPC) were investigated in this study for electric vehicles. Following the Lithium-ion traction battery pack and system for electric vehicles, Part 3: Safety requirements and test methods 31467.3-2015 standards, the BPC specimen was exposed to 500–600 ◦C for 15 min. Six thermocouples monitored the non-exposed surface, which reached a maximum of 149.7 ◦C, below the 150 ◦C limit. No flame occurred during or after heating, and the structure maintained integrity without cracks. The results confirm the flame-retardant BPC’s excellent thermal shielding and demonstrate its potential to enhance EV battery safety by delaying heat transfer and preventing secondary ignition.
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