NIO EV Platforms

NT2 · NT3 · 900 V · battery swap

NIO designs every car around a pack that can leave it. The swap interface ties three platform generations to one energy network.

Diagram of NIO platform generations. NT1 (2018): 400 V, Mobileye EyeQ4, models ES8, ES6 and EC6. NT2 (2021): 400 V, four NVIDIA Orin X chips in the Adam computer, models ET5, ET7, ES6 and ES8. NT3 (2024): 900 V, NIO's in-house Shenji NX9031 chip, models ET9, the third-generation ES8 and ONVO L60. All three sit on one battery swap network of more than 3,000 stations in China, where packs swap across generations in a few minutes under Battery as a Service. Vehicles are built in Hefei. NIO PLATFORM GENERATIONS ON ONE SWAP NETWORK NT12018 400 V Mobileye EyeQ4 ES8, ES6, EC6 NT22021 400 V 4x NVIDIA Orin X ET5, ET7, ES6, ES8 NT32024 900 V Shenji NX9031 ET9, ES8, ONVO L60 Battery swap network: more than 3,000 stations in China packs swap across generations in a few minutes; Battery as a Service Plants: Hefei (NeoPark and former JAC-NIO sites)
Top voltage
900 V (NT3)
Own chip
Shenji NX9031
Swap stations
3,000+
Hub
Systems

Finding

NIO's platform is defined by a swappable pack, which forces a fixed battery interface across generations and turns the battery into a service

NT2 (2021, ET7 first) brought the Aquila sensor suite with roof LiDAR and the Adam computer, four NVIDIA Orin X chips at 1,016 TOPS. NT3 moved to a 900 V architecture on the ET9 flagship, with two of NIO's own 5 nm Shenji NX9031 chips, SkyRide steer-by-wire with active suspension, and the SkyOS vehicle operating system. The third-generation ES8 (2025) and the ONVO L60 and L90 also use 900 V.

The swap station is part of the platform. Every NIO car carries a pack with a standard mechanical, electrical and cooling interface, so a 2021 ES6 and a 2025 ET9 can draw from the same stations; owners can buy the pack or rent it under Battery as a Service (BaaS). NIO passed 100 million cumulative swaps in early 2026 and plans about 1,000 more stations during the year. ONVO and the small-car brand Firefly use their own swap-compatible packs.

The cost is complexity. Swapping requires the pack to stay the same physical size and shape while chemistry improves, which limits cell-to-body integration, and the network runs at a loss while utilization grows. CATL's Choco-swap standard offers other automakers a shared alternative. See Most SDV-Advanced EVs for how NIO's software stack compares.

Lineup

NIO platforms compared

Model lists are brief.

NIO EV platforms
PlatformLaunchedVoltageCompute and E/EBatteryModels
NT12018400 VMobileye EyeQ4 (NIO Pilot)70 and 100 kWh swappableES8, ES6, EC6 (first generation)
NT22021400 VAdam: four NVIDIA Orin X; central gateway75, 100 and 150 kWh swappableET5, ET5T, ET7, ES6, EC6, ES7, ES8, EC7
NT32024900 VTwo Shenji NX9031; SkyOS; steer-by-wire on ET9SwappableET9, ES8 (third generation)
ONVO2024900 VNVIDIA Orin X; NIO-derived E/ESwappable ONVO packL60, L90
Firefly2025Not disclosedCompact-car E/ESwappable Firefly packFirefly

Swap layer

Why swapping is a platform decision

Battery swap as a platform layer
ConstraintEffect on the platform
Fixed pack envelopeSame footprint and mounting points across generations
Standard connectors and cooling portsElectrical and thermal interface frozen for years
Pack ownershipBaaS lowers purchase price and moves pack risk to NIO
Off-vehicle chargingStation charges slowly at off-peak rates; car leaves full in minutes

Sources

Sources and scope

Scope
NIO EV Platforms
Sources
NIO investor materials and NIO Day presentations; press reports on swap network (2026)
Updated
October 2026