Mercedes-Benz AMG GT XX
Groundbreaking high-voltage battery with direct-cooled cylindrical cells enables supreme, sustained performance on the road and at the charging station. The concept vehicle can recharge energy for about 400 kilometres of range (WLTP)[1] in around five minutes – the distance from Affalterbach to Spa-Francorchamps. Four-door coupé packed with innovations inside and out
London, June 25, 2025 , (Oilandgaspress) –––The CONCEPT AMG GT XX is a pioneering technology programme that offers an impressive insight into a forthcoming four-door series-production sports car from Mercedes‑AMG. With three axial flux motors and a high performance battery developed from scratch, the brand from Affalterbach presents a revolutionary drive concept that enables a whole new dimension of performance. It includes an abundance of technical solutions earmarked for use in the subsequent series-production models based on the high performance AMG Electric Architecture (AMG.EA).
Revolutionary drivetrain: high performance axial flux motor and a new kind of battery technology
In the almost 60-year history of the Mercedes-Benz performance and sports car brand, the drive was always the heart of the vehicle, bar none. The team at Affalterbach are continuing this tradition with the CONCEPT AMG GT XX, which introduces a revolutionary drive technology in the form of the innovative axial flux motor.
Its technological underpinnings were originally developed by British electric motor specialist YASA – a 100-percent subsidiary of Mercedes‑Benz AG. For its application in the CONCEPT AMG GT XX and subsequently in series production, the concept was taken to a whole new level of performance. This was achieved in a collaboration between Mercedes‑AMG and the technology experts from YASA. The performance specialists from Affalterbach have also developed the software for the operating strategy, which optimally utilizes the high performance of the engines in the technology carrier. The innovative electric motors enable high power from an extremely compact package and enter series production at Mercedes‑AMG in 2026.
Thanks to a peak output of over 1,000 kW, the CONCEPT AMG GT XX can reach top speeds of more than 360 km/h. In combination with the new high performance battery, the three axial flux motors attain a completely new level, particularly in respect of continuous power. This allows the CONCEPT AMG GT XX to be pushed to its limits repeatedly, offering a new level of continuous performance that was almost unthinkable in the world of electric mobility – until now. The battery remains in an optimal temperature range even during intense driving, enabling not only performance on the road but also extremely fast charging. The concept vehicle can recharge energy for about 400 kilometres of range (WLTP)[1] in around five minutes, which is roughly equivalent to the distance from Affalterbach to Spa-Francorchamps. After the charging stop, the vehicle can immediately deliver full power again – an unprecedented capability.
Significant benefits in power profile, weight and packaging
Axial flux motors offer many benefits: they are significantly more compact, lighter and, above all, more powerful than conventional electric motors (radial flux motors). The power density of axial flux motors is around three times that of conventional electric motors. At the same time, the innovative motors are around two-thirds lighter and take up just one third of the space. This compact motor design offers more freedom when it comes to drivetrain packaging. Compared with conventional electric motors, the innovative drive delivers a considerably higher sustained power output as well as higher torque. This translates into the highest levels of performance, reproduceable again and again with great frequency.
In an axial flux motor, the electromagnetic flux runs parallel to the motor’s axis of rotation. In a conventional electric motor, on the other hand, it runs perpendicular to the axis of rotation. In an axial flux motor, the large components are shaped like slim discs. The stator is positioned between two rotors on the left and right sides. This layout of stator and rotors enables optimum power transmission to the rotors through the electric field generated by the stator. In the CONCEPT AMG GT XX, this combination is barely nine centimetres wide. Each of the two motors at the rear is around just eight centimetres wide.
Compelling power: more than 1,000 kW peak output
No fewer than three of these innovative electric motors guarantee outstanding system power in the CONCEPT AMG GT XX. Its peak output is more than 1,000 kW (>1,360 hp). The motors are packaged into two High Performance Electric Drive Units (HP.EDUs) – one at the front and one at the rear. The HP.EDU at the rear has two axial flux motors, each equipped with a compact planetary gearset and one inverter, in a single casing. The motors and transmissions are oil-cooled. To save even more space, the necessary pump control unit with hydraulic pumps and suction filters is likewise integrated into the HP.EDU. The two inverters (one per motor) are water-cooled. The material properties of silicon carbide offer multiple benefits for demanding applications requiring high voltages, high current, high temperatures and high heat conductivity.
The front HP.EDU comprises one axial flux motor, a spur-gear transmission and an inverter. The front electric drive functions as a booster motor. It only kicks in when additional power or traction is required at the front wheels. When the front electric motor is not needed, a Disconnect Unit (DCU) decouples it. During acceleration and recuperation, the DCU engages for optimal performance. During steady driving, low load, and coasting, it disengages again, reducing unnecessary drag losses and increasing efficiency.
The individual cells are packaged into laser-welded plastic modules, whereby performance thinking is also to the fore. Direct cell cooling is integrated into the plastic modules to ensure optimum heat dissipation. A high-tech coolant based on an electrically non-conductive oil flows around each individual cell to maintain the optimum temperature. The coolant flows through coolant channels in the modules, which are optimised for equal cooling of all the cells. A special piping system ensures even distribution of the cooling oil. There are more than 3,000 cells in the CONCEPT AMG GT XX.
The lithium-ion energy storage unit has a high voltage of more than 800 volts, which also contributes to overall performance. The benefits of the high voltage are lower weight due to the lighter cabling, higher continuous power output and shorter battery charging times. Charge losses via the charging cable are also considerably less.
The charging performance likewise sets new benchmarks – again due to direct cooling. This pairs with optimised thermal management of the cells and power lines during charging. The CONCEPT AMG GT XX achieves a very high average charging power of more than 850 kW at 1000 amperes over a wide range of the charging curve.
To match the vehicle’s charging performance, the Mercedes‑Benz Charging Unit worked in close collaboration with its partner Alpitronic, the European market leader in high-power charging. Alpitronic has developed a prototype charging station. It is the first charging station able to transmit such a high current via a standard CCS cable.
For the future series-production models, Mercedes-Benz will expand the infrastructure of its own Mercedes‑Benz Charging Network with the next generation of high performance charging stations. Customers will benefit from extremely fast charging processes, where charging times differ only slightly from conventional refuelling with fuel.
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