How does the gas-electric hybrid engine work in the BMW i8?

I'm curious about how the gas-electric hybrid engine in the BMW i8 works. Can anyone explain the mechanics behind it?

The gas-electric hybrid engine in the BMW i8 works by combining the power of a gasoline engine and an electric motor. The gasoline engine charges the battery while driving and the electric motor assists in accelerating the car. This allows for better fuel efficiency and reduced emissions.

The gas-electric hybrid engine in the BMW i8 relies on regenerative braking to charge the battery. When you brake, the kinetic energy is converted into electrical energy and stored in the battery. This way, energy is not wasted and the battery is kept charged for use in boosting performance.