Honda is working on wireless charging for EVs at highway speed

Honda is working on a technology that could change one of the biggest habits surrounding electric cars: stopping to charge. At the center is a system for wireless, inductive charging while driving. The goal is to supply electric cars with energy even at highway speed – a speed of around 74 mph, or about 119 km/h, is cited.

At first, that sounds like science fiction, but it is not an entirely new basic principle. Inductive charging uses electromagnetic fields to transfer energy between a coil in the ground and a receiving unit in the vehicle. Many people know the principle from smartphone charging pads. In a car, however, the task is far more demanding: higher power levels, greater distances, weather, vehicle position, driving speed, safety and integration into public roads must all be reliably mastered.

Why Honda is working on it

The most important point is not just convenience. Honda apparently also sees dynamic wireless charging as a way to reduce the battery size of future electric cars. If a vehicle can regularly take on energy while on the move, in theory it needs to bring less range from a large battery. Smaller batteries could reduce weight, raw material demand and costs – three factors that are crucial for more affordable electric cars.

Today, the battery is often the most expensive single item in an EV. Large battery packs improve range, but they also increase vehicle weight and price. They also require more raw materials and, depending on charging power, extend dwell time at fast-charging stations. A road that transfers energy while driving would shift this relationship: range would then no longer be only a property of the car, but also of the infrastructure.

For buyers, that would be a fundamental change. Instead of assessing a vehicle mainly by its maximum range, charging availability on certain routes, efficiency and battery size could move more strongly into focus. Commuters, delivery services, taxis and fleet operators in particular would potentially benefit if vehicles could be recharged along defined routes.

The difference from charging while stationary

Wireless charging while stationary has been tested for years and is in some cases already being offered or prepared. There, the car parks over a ground plate, and the energy flow starts automatically when the vehicle and charging unit are correctly aligned. That can be more convenient than a cable, but it does not solve the issue of long charging breaks on trips.

Dynamic charging while driving is significantly more complex. The energy must be transferred within very short time windows while the vehicle moves over individual charging segments. The system must detect when a compatible vehicle is driving over the coil, activate energy transfer, bill for it and immediately switch off again. At the same time, other road users, pedestrians, animals or electronic devices must not be endangered or disturbed.

There is also the question of efficiency. Every energy transfer causes losses. If electricity first goes into the grid, then into the road, then via an electromagnetic field into the vehicle and finally into the battery, the overall efficiency must be high enough for the system to remain economically and energetically sensible.

What 119 km/h would mean

The cited target speed of about 119 km/h is important because it would not limit use only to depots, city bus lanes or slow test tracks. A system that works at this speed would in principle be relevant for expressways and highways. That is precisely where the energy consumption of electric cars is particularly high because of air resistance and high continuous power demand.

However, successful development in the laboratory or on a test track does not mean that entire highways will soon be able to charge vehicles. Between a functioning prototype and a nationwide road network lie major technical, regulatory and financial hurdles. Roadways would have to be equipped with coils, power electronics, sensors, communication modules and grid connections. Maintenance, snow clearing, construction work, road damage and safety inspections would become more complex.

Standardization is also crucial. Dynamic charging only makes sense if not every manufacturer needs its own system. Vehicles from different brands would have to be compatible with the same infrastructure. That would require common standards, billing systems and safety requirements. Without such standards, the technology would remain limited to restricted corridors or fleet applications.

Who could benefit first

For private customers, a widely available charging highway would probably be a long-term scenario. Initial use on clearly defined routes is more likely. These include logistics routes, bus lines, factory premises, port areas or highway sections with very high traffic volumes. There, investments can be planned better because many vehicles regularly use the same route.

Fleets could benefit especially strongly. An electric delivery van or truck that recharges while driving could make do with a smaller battery or achieve longer operating times. In heavy commercial vehicles, battery weight is an even bigger issue than in passenger cars because every kilogram of battery affects payload. Charging infrastructure at depots could also be relieved if vehicles take on part of their energy while on the road.

For passenger cars, the benefit would depend on the extent of expansion. Individual charging sections could compensate for energy consumption on long routes, but they do not automatically replace fast charging or charging at home. For many drivers, a combination of home charging, fast charging and possibly dynamic charging is likely to be more realistic than a complete switch to roads that deliver energy everywhere.

What this means for Honda's electric strategy

Like other established manufacturers, Honda faces the task of making electric cars more affordable, efficient and suitable for everyday use. Wireless charging at higher speed would be a technological differentiator if it can be implemented reliably, safely and economically. At the same time, it is not a short-term substitute for current challenges such as more fast-charging points, better software, more efficient drivetrains and competitive battery costs.

For enthusiasts, the development is exciting because it shows that the next phase of electromobility will not be decided only in the car itself. The boundary between vehicle technology and transport infrastructure is becoming more blurred. In the future, an EV could communicate more closely with the road, take on energy and optimize its route planning not only according to charging stations, but also according to electrified road sections.

For the industry, such a system would be a large ecosystem: automakers, energy suppliers, road operators, construction companies, charging infrastructure providers, semiconductor manufacturers and authorities would have to work together. This very complexity is also the biggest brake. A new vehicle function can be introduced faster than a new type of road.

Still many open questions

Important details are currently open. These include the achievable charging power, efficiency at highway speed, the cost per kilometer of equipped road, durability in everyday use, the effects on tire and roadway rehabilitation, and the question of how electricity billing for individual vehicles would work. It is also unclear when Honda could derive concrete production applications from the development.

Therefore, the news should not be understood as an indication that EVs will soon drive everywhere without charging breaks. More realistically: Honda is investigating a technology that could help in the long term to make batteries smaller and electrify certain routes more efficiently. If it works and is standardized, it could make a real contribution, especially on heavily traveled corridors.

For car buyers today, little changes in the short term. Range, charging power, efficiency, warranty and access to reliable charging points remain the decisive criteria. In the medium to long term, however, Honda's approach shows where electromobility could develop: away from thinking purely in ever larger batteries – toward a system in which vehicle and road jointly provide the energy supply.