Energy storage systems in EVs are designed to store electrical energy that can be used to power the vehicle. The battery pack is responsible for providing the. . Like the engine is the heart of an internal combustion engine (ICE) vehicle, the EV battery is the heart of an electric vehicle, determining everything from its range to its price. But what goes into making these batteries, and where is this technology headed? Batteries, like fuel in ICE vehicles. . A battery energy storage system is a device or collection of devices intended for later use after storing energy produced from a variety of sources, most usually electricity generated by renewable energy. Regarding electric cars, the energy storage battery is like a lifeline since it runs the. .