[2][3] A pre-production version of the Nio ET9 was initially revealed in China on December 23, 2023 at the 'Nio Day 2023' event at Xi'an's Olympic Sports Center, after which pre-orders for the ET9 opened with delivery scheduled for March 2025.
[4] At the 'Nio Day 2024' event held at Guangzhou on December 21, 2024, the production version of the ET9 was revealed with notable changes to its design, along with significantly more information about features and pricing.
[2] The ET9 is an F-segment four-seater full-size luxury liftback sedan with a length of 5,325 millimetres (209.6 in) and a wheelbase of 3,250 millimetres (128.0 in), which is close to the 3,300-millimetre (129.9 in) maximum wheelbase that third generation Nio battery swap stations can accommodate, and is too long to be incompatible with first and second generation stations.
[7] The single powertrain option is a dual-motor all-wheel drive system with a total output of 697 hp (520 kW; 707 PS) and 700 N⋅m (520 lb⋅ft) of torque.
It uses a 79kg permanent magnet synchronous motor with W-pin (continuous wave) windings for higher efficiency and smaller dimensions, and runs at 925V to output 340 kW (456 hp; 462 PS) to the rear wheels, for a power density of 4.3kW/kg.