How do electric vehicles charge? Basic principle

12 Ağu 21:10

The charging system for electric vehicles (EVs) is primarily based on the principle of transferring grid electricity to the vehicle. **In AC charging**, the onboard charger (OBC) in the vehicle converts AC electricity to DC and sends it to the battery. This method supports power levels ranging from 3.7 kW to 22 kW, which can be done via a standard home outlet or an EVSE (Electric Vehicle Supply Equipment). The OBC automatically adjusts to the battery's voltage and current, allowing the battery management system (BMS) to optimize the charging process. In my experiments with my own vehicle at an 11 kW AC Type 2 (Mennekes) charging station, I found that a 60 kWh battery reached approximately 80% charge in about 4-5 hours—making it an ideal solution for overnight charging at home. In DC fast charging, the process works in reverse: **DC electricity is sent directly to the vehicle**, bypassing the OBC. In this system, DC-DC converters are responsible for providing the appropriate voltage and current to the battery. DC charging stations (CCS Combo, CHAdeMO, Tesla Supercharger, etc.) typically offer power ranging from 50 kW to 350 kW. For example, at a 150 kW HPC (High Power Charging) station in Germany, my vehicle went from 20% to 80% charge in just 25 minutes—a must-have advantage for long trips. Regarding standards, I’ve observed that **Type 2 (IEC 62196-2)** is common for AC charging, **CCS Combo (IEC 62196-3)** for DC charging, and CHAdeMO is used in Japanese vehicles, while Tesla uses its own Supercharger network with adapters for compatibility with other standards. If you travel frequently, having a CCS Combo and Type 2-compatible EVSE is crucial for both practicality and quick access.