The document discusses the history and components of battery electric vehicles (BEVs). It notes that the first human-carrying electric vehicle was tested in Paris in 1881. BEVs use electricity from batteries to power an electric motor rather than an internal combustion engine. The key components of BEVs are the battery charger, traction batteries, power converters, electric motor, motor controller, transmission system, and differential system. BEVs are further classified based on their energy storage sources into pure electric vehicles (PEVs/BEVs), fuel cell electric vehicles, ultracapacitor electric vehicles, and ultraflywheel electric vehicles.