Direct current (DC) is the flow of electric current in a circuit in a single direction.A form of electrical energy whose voltage remains constant or changes slowly. It is widely used in battery systems, electric vehicles, energy storage devices and electronics.
Roles in Batteries:
All batteries inherently output DC current
The direction of electron flow produced by the battery chemical reaction is fixed , so it naturally produces DC output
In the energy storage system, the inverter (DC-AC inverter) is responsible for converting direct current into alternating current to adapt to the grid.

