Wireless EV charging has spent years sitting somewhere between a compelling convenience feature and an engineering challenge. BMW is now taking another close look at what comes next. On September 21, 2026, HEVO announced its participation in a technology evaluation involving BMW and the U.S. Department of Energy’s Oak Ridge National Laboratory, with the work focused on advanced wireless power-transfer technology.
The immediate project is not a new BMW charging product headed for showrooms. Instead, HEVO is supplying engineering expertise and circular-coil technology as BMW conducts bench testing involving ORNL’s polyphase wireless charging architecture. Behind that relatively technical description is a much bigger question: whether wireless EV charging can become smaller, more efficient, more powerful and easier to integrate into future vehicles without sacrificing interoperability or safety.
A Bench Test, Not a Product Launch
The most important detail in the new program is also the easiest to overlook. BMW is evaluating technology, not announcing a production charging system. According to HEVO’s September 21 announcement, the company is supporting BMW bench testing intended to evaluate compatibility between HEVO-supported circular coil topologies and ORNL’s proprietary polyphase technology. No BMW model, production date, price or consumer launch schedule was identified.
That distinction matters because the automotive industry often spends years evaluating promising hardware before deciding whether it belongs in a production vehicle. Wireless charging requires much more than demonstrating that electricity can cross an air gap. Automakers have to consider packaging beneath the vehicle, cooling, electromagnetic compatibility, component weight, ground clearance, alignment, safety and how equipment from different suppliers will work together. The BMW evaluation therefore represents an engineering step rather than a showroom milestone. Still, it is significant because BMW and ORNL already have a documented technical relationship involving a 22-kW polyphase wireless power-transfer system, giving the latest compatibility work a substantial research foundation.
The 22-kW System Shows Why BMW Is Interested
ORNL revealed in 2026 that it and BMW Group had developed a 22-kW polyphase wireless power-transfer system using rotating magnetic fields. According to the laboratory, the design delivers roughly twice the charging power of current standardized light-duty wireless systems while occupying 61% less space. ORNL also reported charging efficiency above 95%, alongside lower use of ferrite, copper and aluminum.
Those figures illustrate why wireless charging research has moved beyond simply eliminating a cable. A compact 22-kW receiver could be considerably easier for an automaker to package under a passenger vehicle than earlier high-power designs, particularly when engineers are already fighting for space around battery packs, thermal-management equipment and structural components. The 22-kW level is also notable because the current SAE light-duty wireless charging standard specifies power levels up to 11 kVA, with a future expansion toward 22 kVA contemplated. BMW and ORNL’s research therefore sits close to a power level that could eventually become much more relevant to mainstream standardized wireless charging rather than remaining an isolated laboratory experiment.
Polyphase Coils Change the Magnetic Field
Conventional inductive EV charging generally relies on coils in a ground assembly and a receiver mounted beneath the vehicle. Alternating electrical current creates a magnetic field, allowing energy to cross the physical gap without metal-to-metal electrical contact. ORNL’s polyphase architecture changes the way that field is produced. Multiple phase windings generate a rotating magnetic field, allowing the available electromagnetic space to be used more effectively than in a conventional single-phase design.
ORNL has demonstrated the broader concept well beyond the 22-kW BMW project. Its researchers previously transferred 50 kW across a 150-millimetre gap with approximately 95% DC-to-DC efficiency in published three-phase research. More recent polyphase development has reached much higher power levels, including vehicle demonstrations at 100 kW and 270 kW. ORNL says the architecture can achieve substantially higher power density than conventional coils while reducing electrical and thermal stresses. Importantly for the new BMW testing, ORNL also describes its polyphase architecture as capable of working with different receiver arrangements, including three-phase, conventional circular and double-D coil configurations. That potential flexibility is exactly why compatibility testing matters.
HEVO Bridges Research and Commercial Hardware
HEVO’s place in the project goes back several years. Oak Ridge licensed high-power wireless EV charging technology to HEVO in 2021, including ORNL’s polyphase electromagnetic coil technology and the Oak Ridge Converter. The converter was designed to remove a power-conversion stage from the charging architecture, with the objective of making stationary infrastructure more compact and efficient. The collaboration also included work toward much higher-power wireless charging systems.
The new BMW evaluation gives HEVO a somewhat different role. Rather than simply supplying one finished charger, the company says it is contributing engineering support, wireless-charging expertise and circular coil topologies as BMW assesses compatibility with ORNL’s polyphase system. That makes HEVO a bridge between national-laboratory research and the practical engineering problems that accompany potential commercialization. It is an important part of the wireless-charging puzzle. A laboratory architecture may demonstrate excellent power density or efficiency, but automakers ultimately need systems that can be manufactured, packaged, installed and operated predictably. HEVO’s existing licensing relationship with ORNL gives the company direct experience with technology BMW is now evaluating.
Compatibility May Matter as Much as Raw Power
Wireless charging becomes far more useful if a vehicle is not permanently tied to one proprietary ground pad. That is why SAE J2954 is central to the industry’s development. The current standard establishes requirements involving interoperability, electromagnetic compatibility, electromagnetic-field exposure, minimum performance, safety and testing for stationary wireless charging of light-duty plug-in vehicles. Its existing charging classes extend to 11 kVA, with higher power contemplated in future revisions.
BMW’s latest bench work is therefore interesting for reasons beyond charging speed. HEVO specifically says the testing is examining compatibility between circular and polyphase technology. ORNL’s own technical description says its polyphase system can accommodate multiple receiver types, including circular and other single-phase configurations. Demonstrating that flexibility under realistic automaker testing would be valuable because the charging ecosystem is unlikely to succeed if every new coil architecture requires entirely separate infrastructure. Compatibility testing does not mean that a design has been certified to a particular standard, nor does it guarantee future production. It does show that interoperability is being treated as a core engineering question rather than something to solve only after the technology reaches vehicles.
Efficiency, Size and Materials Are the Real Engineering Fight
Wireless charging has an unavoidable engineering challenge: power must cross an air gap rather than flow through a physical connector. That places enormous importance on coil design, electromagnetic coupling, power electronics and thermal management. The ORNL-BMW 22-kW system is notable not simply because it passes 22 kW, but because ORNL says it does so at greater than 95% efficiency while occupying 61% less space than current standard wireless systems and using considerably less ferrite, copper and aluminum.
Research conducted under the BMW-ORNL collaboration has gone deeper into those losses. A 2026 IEEE Applied Power Electronics Conference project involving ORNL researchers and BMW examined the Litz wire used in high-power wireless coils. The researchers reported that an optimized wire design could reduce copper volume by around 60% for the same loss level while improving coil-to-coil efficiency by more than two percentage points. Their optimized 22-kW wireless system achieved 95.5% efficiency. Those kinds of improvements can matter enormously in a production vehicle. Less copper and smaller coils can reduce mass, material demand and packaging pressure, while higher efficiency means less energy becomes waste heat that engineers must manage.
BMW Has Been Here Before
BMW is hardly new to the idea of charging without cables. In 2018, the company launched BMW Wireless Charging for the 530e iPerformance plug-in hybrid. The system paired a GroundPad with a receiver mounted underneath the car, transferring energy across a gap of roughly eight centimetres. BMW reported 3.2 kW of charging power, an overall efficiency of about 85% and a full charging time of approximately three and a half hours for the 530e’s high-voltage battery.
The contrast with today’s research is striking. The earlier system showed that inductive charging could work as a customer-facing convenience feature, complete with vehicle guidance to help position the car over its charging pad. The ORNL-BMW research now pushes toward roughly seven times the charging power of that original 3.2-kW system while reporting efficiency above 95% for the newer 22-kW architecture. The comparison is not perfectly apples-to-apples because the systems, batteries and efficiency measurements belong to different generations of technology. Even so, BMW’s previous commercial experience means the company is not encountering wireless charging for the first time. It already has practical experience with the usability and vehicle-integration issues involved.
What Has to Happen Before Drivers See It
The new evaluation leaves several major questions unanswered. HEVO’s announcement does not identify which BMW vehicle architecture is being used for the bench work, whether on-road vehicle testing is planned, what exact combination of transmitter and receiver hardware might ultimately be preferred or whether BMW intends to commercialize the system. Those missing details are important because successful bench compatibility is only one stage on the path toward automotive production.
Any future consumer implementation would also have to fit within evolving safety and interoperability requirements. SAE’s current light-duty standard deals with issues such as electromagnetic compatibility, field exposure, performance and communication between vehicle and ground equipment. Practical systems also need reliable alignment and protection against objects entering the charging area. BMW already incorporated object-detection and positioning features into its earlier 530e wireless system, while ORNL’s later high-power research includes electrical and thermal protection strategies.
For now, the significance of the BMW, ORNL and HEVO effort is less about eliminating the charging cable tomorrow and more about removing the engineering compromises that have kept wireless charging from becoming commonplace. If higher power, smaller hardware, strong efficiency and cross-platform compatibility can exist in the same package, wireless EV charging starts looking considerably less experimental.
