The process of adding energy to a battery cell or cells in a pack and so moving the State of Charge from a low value towards 100%. This simple process is actually far from simple and covers the electrochemical, thermal, electrical, infrastructure, standardisation and all the way through to electricity generation.
When looking at the key parameters in fast charging a battery pack it is worth looking at the complete system. Also, it is good to look from the cell at atomic scale through the thermal system design to the charging algorithms and handshakes.
The drive for a 10 min fast charge to reach 80% state of charge is tough against the other pressures of reducing cost and shrinking the pack. In most cases this fast charge is the worst case in terms of power requirements for the battery pack.
Vehicle to Grid (V2G) allows the battery in an electric vehicle to put energy back into the electricity grid. Essentially the battery has a bi-directional connection. This allows:
- energy to be sold back to the grid
- support for local brown-outs
- ability to power your house off-grid
Vehicle to Vehicle (V2V) allows the battery pack on one vehicle to be used to charge another electric vehicle.