E-vehicles and the Golf GTE have a 12V support battery, and are also fitted with a lithium-ion high-voltage battery. Lithium-ion high-voltage batteries are made up of several components. The robust exterior housing of the battery contains numerous modules, which are ordered differently inside the battery according to model or space. Each module consists of an array of interconnected battery cells. Electrical energy is stored in the battery cells developed especially for electric and hybrid vehicles. These cells contain a large electrical power supply and a high energy capacity. Energy is taken from the battery during driving and is made available to the electric motor. The electric motor recuperates during braking; this means that the battery is recharged using braking energy. During this entire process, a number of integrated safety systems and sensors are monitoring the cells, in particular their voltage and temperature.

Article source: www.volkswagen.co.uk