Xiaomi (小米) SU7 standardizes 1500MPa scratch‑resistant bottom beam to reduce battery damage risk

What Xiaomi changed

It has been reported that Xiaomi (小米) has standardized a 1500MPa scratch‑resistant bottom beam on the new‑generation SU7. The component — a high‑strength underbody beam designed to deflect and “push away” road obstacles — is said to lower the likelihood of direct impact to the vehicle’s battery pack. That sounds simple. But in an electric vehicle, a small design tweak can have outsized effects on safety and durability.

How it works

1500MPa refers to the tensile strength of the material, placing this beam in the realm of ultra‑high‑strength steels and advanced hot‑stamped parts commonly used to protect critical structures. By routing forces away from the battery enclosure and resisting surface abrasion, the beam aims to prevent punctures or tears that could lead to thermal runaway or expensive repairs. Reportedly, the SU7’s geometry and surface treatment also improve scratch resistance — not just raw strength — so small debris and curbs are less likely to initiate damage.

Why it matters

For Western readers less familiar with China’s automotive landscape: Xiaomi’s move shows how Chinese tech companies are translating consumer electronics playbooks into automotive engineering. Automakers worldwide are focusing on passive, mechanical protections as batteries remain one of the costliest and most safety‑sensitive parts of an EV. It comes against a backdrop of intensifying global competition and regulatory scrutiny of Chinese EVs, and of supply‑chain pressures that make robust, low‑tech safety measures attractive in addition to electronic protections.

The bigger picture

Will other manufacturers follow? Likely. Standardizing higher‑strength underbody protection could become a selling point in export markets and among insurers. For consumers, the change promises incremental but meaningful reductions in one of the more serious risks of EV ownership: underbody strikes that can cascade into battery damage.