In addition to conventional EV charging methods, cars have many special EV charging techniques for use in specific contexts: battery swapping, wireless charging, vehicle-to-vehicle charging, towing charging, and solar charging.
Battery Swapping
Battery swapping involves removing and replacing a depleted battery with a fully charged one, similar to changing the batteries in a toy car. Battery swapping is routine for NIO cars, but most people still find it quite novel, so it’s classified as a special method for now. Besides NIO cars, a few taxis are also experimenting with battery swapping. Due to the small scale and higher costs, the electricity price per kilometer is about 0.3 CNY, more expensive than charging, but it saves time.
| Advantages of Battery Swapping | Disadvantages of Battery Swapping |
| As quick as refueling | Increases vehicle costs |
| Vehicle-to-grid services can extend usability | Challenging to popularize |
| Requires less space than charging stations | |
| Can stagger electricity demand |
Battery swapping has national standards and subsidies in place, and many battery and car manufacturers, as well as third-party operators, are following up. It’s believed that the development speed will accelerate. We took one video and closely watched the whole process of battery swapping. It only took 3 minutes for the whole process. You can find the whole process in the following video; it’s 2x fast forward.
Wireless Charging
Wireless charging uses electromagnetic induction, where a coil in the transmitter generates a magnetic field when powered, inducing a current in the receiver’s coil that then charges the battery through the onboard charger. Wireless charging is widely used in smartphones and other small electronic devices. But is still in the testing phase for vehicles, with mass production and delivery expected soon.
| Advantages of Wireless Charging | Disadvantages of Wireless Charging |
| There is no need to plug and unplug cables | Increases costs for vehicles and charging stations |
| Increased charging power loss | |
| Requires precise parking alignment | |
| Charging can be affected by objects |
Vehicle-to-Vehicle Charging
Vehicle-to-vehicle charging allows one vehicle to charge another and can be categorized as fast or slow charging.
- Vehicle-to-Vehicle Fast Charging
Typically, a commercial service is provided by professional charging vehicles offering on-site charging or emergency roadside assistance.
- Vehicle-to-Vehicle Slow Charging
Non-commercial service, where vehicles with discharge capability charge other vehicles, generally for temporary assistance among drivers.
| Advantages of Vehicle-to-Vehicle Charging | Disadvantages of Vehicle-to-Vehicle Charging |
| Can charge anywhere, convenient for emergency assistance | High overall cost |
| Significant energy losses |
Towing Charging
Towing charging involves using an external force to pull a vehicle, charging it through an energy recovery system. In remote areas without power, you can ask passing vehicles to assist with tow charging. Field tests show good charging performance, with faster towing leading to higher charging power. But for safety, please tow at low speeds!
| Advantages of Towing Charge | Disadvantages of Towing Charge |
| Quick charging, effective for rescue | Energy consumption far exceeds recovery |
| Risk of collision |
If you find that your EV is running low on power in the wild, towing charging is a really good method. You would ask another vehicle to tow yours and help charge enough power to reach a location with a charging station.
Solar Charging
Using solar panels to generate electricity for vehicle charging is likely the cleanest and most environmentally friendly method. Unfortunately, due to the low efficiency and unstable output of the solar panels, an additional battery storage system is required. Recently, more and more home users or commercial projects have combined EV charging with solar power systems. They can get full usage of clean energy. Some countries have extra subsidies for this kind of solar charging project.
| Advantages of Solar Charging | Disadvantages of Solar Charging |
| Clean and eco-friendly | Very low power generation efficiency |
| Low operating costs | High equipment costs |
| Bulky and heavy equipment |
Miles Energy provides professional AC and DC Charging stations for matching solar charging. No, whether for solar charging with a battery storage system or an on-grid solar charging system. Contact us to know more info.
Conclusion
The way we charge new energy vehicles is constantly changing. We’ve moved from battery swapping to solar charging. Each new method shows our quest for a cleaner and more efficient way to travel. These methods have unique features but also challenges. These challenges drive engineers to keep improving and make things easier to use.
Introducing these methods to the public isn’t easy. Costs, building the necessary infrastructure, and setting technical standards are all hurdles. But with policy support and advancing technology, we expect to see stable, easy-to-use, and green charging options become popular soon. They will mark the start of a new era in smart travel. Let’s look forward to this exciting future.