The new-generation Xiaomi SU7 underwent a battery nail penetration test. Why can the "bulletproof coating" be directly pierced by the steel nail?
Official answer
The new-generation Xiaomi SU7 comes standard across the entire series with the same battery bottom "bulletproof coating" as the SU7 Ultra, which is more resistant to scratches and punctures, reducing the risk of damage to the battery bottom caused by scraping. In the nail penetration test, to facilitate the steel nail piercing into the battery cell to trigger thermal runaway, the steel plate and bulletproof coating at the bottom of the battery were pre-drilled in advance. This is also a standard procedure for the nail penetration test, so you do not need to worry.