Why is Xiaomi SU7’s Bulletproof Coating Pierced in Nail Penetration Test? | Xiaomi SU7 Battery Safety Explained
Why can the “bulletproof coating” be directly pierced by a steel nail during the nail penetration test conducted on the new‑generation Xiaomi SU7?
The new‑generation Xiaomi SU7 comes standard with the same battery underbody “bulletproof coating” as the SU7 Ultra across all trims. It offers improved scratch resistance and puncture resistance, reducing the risk of damage to the battery bottom caused by undercarriage scraping.
In the nail penetration test, the steel plate and bulletproof coating on the battery bottom were pre‑drilled in advance to allow the steel nail to penetrate the cell and trigger thermal runaway. This is a standard procedure for nail penetration tests, so you do not need to worry.