What is the range-extending principle of the Li ONE?

[LeCooper]

The Li ONE's range-extended hybrid is essentially a series hybrid, meaning the engine and electric motor operate in a series configuration. The engine is directly connected to the generator and, when started, can only drive the generator to produce electricity rather than directly powering the wheels. The electricity generated by the generator is then used to drive the electric motor via an inverter/drive board, with any excess electricity stored in the battery. In EV mode, the battery supplies power to the electric motor, which drives the wheels. In HEV mode, the engine drives the generator to produce electricity, which then powers the electric motor. During rapid acceleration, when power demand is high, the battery supplements any shortfall, meaning both the battery and the generator work together to drive the electric motor. The advantages of a series hybrid include a simple structure, lower design and production difficulty, and lower costs, making it suitable for pure electric vehicles with large-capacity batteries. However, the drawbacks of a series hybrid are also quite apparent. The energy generated from fuel must undergo two conversions before driving the vehicle, resulting in lower efficiency and, consequently, less competitive fuel consumption. Compared to conventional fuel vehicles in the same class, the Li ONE has a slight advantage in fuel consumption during low-speed urban driving, as the engine wastes less energy when running, and excess power is absorbed by the generator and stored in the battery. Conventional fuel vehicles in urban conditions often operate at low gears, low speeds, and high RPMs, leading to significant energy waste. At medium to high speeds, the series hybrid's fuel consumption loses its advantage. The Li ONE is a smart electric mid-to-large SUV launched by Li Auto in October 2018, featuring advanced range-extending electric technology and intelligent systems. The 2021 Li ONE is equipped with an upgraded range-extending electric system, including a 1.2T turbocharged engine and a new drive motor. The total motor power is 245 kW, with a battery capacity of 40.5 kWh. The pure electric range is 188 km, and the fuel tank capacity has been increased from 45L to 55L. The NEDC combined fuel consumption is 1.5L per 100 km. The vehicle also features Li Auto's self-developed LiOS system and millimeter-wave radar for assisted driving functions.