GB/T 31467.3-2015 is aimed at the safety of lithium-ion power battery packs and systems for electric vehicles. As part 3, it clarifies the safety requirements, covering electrical safety, mechanical safety, thermal safety and other aspects, and gives corresponding test methods, such as overcharge, short circuit, extrusion, fire and other safety test specifications. This standard provides guidelines for ensuring the safety of electric vehicle battery systems and helps improve product safety performance. It is of great significance to promote the safe and reliable development of electric vehicles and eliminate user safety concerns.