At this year´s IAA in Frankfurt we are presenting preproduction models of the new Mercedes-Benz GLC F-Cellas as the next milestone on the road to emission-free driving. Under the technology designation EQ Power, the latest electric model from the Mercedes-Benz family is doubly electrifying, for, in a world first, it is set to combine innovative fuel-cell and battery technology in the form of a plug-in hybrid: in addition to hydrogen, the all-electric variant of the popular SUV will also run on electricity.
Our many years of experience with fuel-cell technology pay dividends in the new GLC F-CELL: its long electric range, short refuelling times and everyday practicality of an SUV will make it the perfect vehicle. This is made possible by the compact construction of our fuel-cell system. Another genuine world first is the combination with a large additional lithium-ion battery, which can be conveniently charged using plug-in technology.
Fuel-cell technology is a firm element of Daimler's powertrain strategy. Under the EQ product brand, the company is pooling its know-how related to intelligent electric mobility while offering a comprehensive e-mobility ecosystem of products, services, technologies and innovations. EQ is therefore a key part of the company's strategy for the mobility of the future, known at Daimler as "CASE".
Unique: fuel hydrogen and charge power
With our GLC F-Cell preproduction model we present a world first in which a fuel-cell-operated electric car uses a lithium-ion battery as an additional energy source that can be externally charged by means of plug-in technology. Through intelligent interplay, the two energy sources drive the electric motor - with locally zero emissions. The long range, short refuelling time, an output of 147 kW (200 hp) and the latest generation of assistance systems with powertrain-specific features demonstrate, based on the models on show, that the GLC F-CELL will be a family-friendly electric vehicle of high everyday practicality.
New fuel cell system developed
For this world first, the Mercedes-Benz engineers cooperated closely with partners from the Daimler competence network to develop a completely new fuel-cell system. Compared with the B-Class F-CELL, which has been on the market since 2010 (fuel consumption: 0.97 kg H₂/100 km/CO₂ emissions, combined: 0 g/km), the overall drive system offers around 40 percent more output. The fuel-cell system is around 30 percent more compact than before, can for the first time be housed entirely in the engine compartment and is installed on the usual mounting points like a conventional engine. Also, the use of platinum in the fuel cell has been reduced by 90 percent. This conserves resources while lowering the system costs – with no compromises in terms of performance.
The lithium-ion battery in the preproduction vehicles on show has a gross capacity of 13.8 kWh and additionally serves as an energy source for the electric motor. For the first time, it can also be charged externally using plug-in technology. An intelligent operating strategy in combination with the fuel-cell/battery system offers maximum efficiency and comfort. Just like the drive motor, the powerful storage battery is space-savingly installed in the rear of the SUV. By means of the 7.2 kW on-board chargers, it can be conveniently charged from a standard household power socket, a wallbox or a public charging station. The charging time is around 1.5 hours if the full capacity is used.
Two carbon-fibre-encased tanks built into the vehicle floor hold around 4.4 kg of hydrogen. Thanks to globally standardised 700 bar tank technology, the supply of hydrogen can be replenished within just three minutes, which is about the same amount of time it takes to refuel a car with an internal combustion engine.
The F-CELL vehicles on show at the IAA are powered by an asynchronous machine with an output of 147 kW (200 hp) and a torque of 350 Nm. As the electric drive requires no propeller shaft, this makes room for one of the two hydrogen tanks, while the second tank is installed under the rear seat bench.
Coordinated: operating strategy with unique variety of combinations
Four operating modes influence the interplay between fuel cell and high-voltage battery and adjust the usage of both energy sources to the operating situation.
In HYBRID operating mode, the vehicle draws power from both energy sources. Power peaks are handled by the battery, while the fuel cell runs in the optimum efficiency range. The intelligent operating strategy means that the characteristics of both energy sources can be ideally exploited.
In F-CELL mode, the state of charge of the high-voltage battery is kept constant by the energy from the fuel cell. Driving almost exclusively on hydrogen is the ideal mode if the intention is to keep the electric range in reserve for certain driving situations.
In BATTERY mode, the GLC F-CELL runs all-electrically and is powered by the high-voltage battery. The fuel-cell system is not in operation. This is the ideal mode for short distances.
In CHARGE mode, charging the high-voltage battery has priority, for example in order to recharge the battery for the maximum overall range prior to refuelling with hydrogen. This mode also creates power reserves for uphill or very dynamic driving.
In all operating modes, the system features an energy recovery function, which makes it possible to recover energy during braking or coasting and to store it in the battery.
Daimler applies extremely high safety standards in all its vehicles. This is true of both vehicles with a conventional internal combustion engine and also those with an alternative drive. This means that the vehicles comply with all legal standards and regulations. However, the internal safety requirements for Mercedes-Benz vehicles go one step further. Especially the crash-related requirements are aligned to the so-called Real Life Safety philosophy. The battery and all hydrogen-containing components are governed by particularly stringent safety standards typical of Mercedes. Alongside safety in the event of a crash, all Mercedes-Benz vehicles undergo additional component tests at system level that go far beyond the usual tests. The powertrain components and hydrogen tanks of the F-CELL preproduction vehicles are space-savingly and safely housed in the engine compartment as well as under the floor.
Self-assured: with the DNA of a genuine Mercedes
When it comes to loading capacity and occupant comfort, the electric SUV will offer excellent everyday practicality. The only differences will be a minimal step in the luggage compartment, familiar from the GLC Plug-in-Hybrid, and the slightly raised rear seat bench due to the positioning of the hydogen tanks. Climate comfort in the GLC F-Cell will also be totally on a par with that in a conventional vehicle. Automatic air conditioning with pre-entry climate control as well as heated seats and mirrors are included as standard. At cooler temperatures, the vehicle will make energy-efficient use of the waste heat from the fuel cell in order to optimise the energy balance of the vehicle.
The series-production vehicle, like the preproduction models, will be equipped with coil springs on the front axle and with single-chamber air suspension with integral automatic level control on the rear axle. This means that, even when the vehicle is carrying a load, there is no change in spring travel on the rear axle, which guarantees balanced vibration characteristics with a virtually constant natural frequency of the body, including when the vehicle is loaded.
Unmistakable: Touches in the style of EQ Power
The design premises of the GLC F-Cell preproduction model include features that emphasise the special status in general and within the GLC family in particular. These features are the formal on-road attributes and the technical modifications to the exterior and interior as well as the control and display concept.
Timed to perfection: on the road to series production
Daimler is systematically working to prepare for series production of the Mercedes-Benz GLC F-CELL. With the current test fleet, the Mercedes-Benz engineers are taking the final key steps on the road to production start-up. Market-specific sales concepts, including a rental model, are being evaluated at present. Like the conventionally powered GLC, this family-friendly SUV of high everyday practicality will be produced in Bremen.
During development and production of the innovative fuel-cell drive, Daimler is able to call upon its global competence network. The centrepiece of the technology, the fuel-cell stack, was developed in Vancouver, Canada, together with partner Ford in the Automotive Fuel Cell Cooperation (AFCC) joint venture. Production takes place directly nearby at Mercedes-Benz Fuel Cell (MBFC). The entire fuel-cell unit and the hydrogen storage system were developed by the Daimler subsidiary NuCellSys in Kirchheim/Nabern in Baden-Württemberg. The Daimler parent plant in Untertürkheim is responsible for fuel-cell system assembly, also in Nabern. The hydrogen tank system, consisting of carbon-fibre-encased tanks, is produced at Daimler's Mannheim plant, while the lithium-ion battery comes from the wholly owned Daimler subsidiary ACCUMOTIVE in Kamenz, Saxony.
Infrastructure is key
A nationwide infrastructure is essential for the success of electric mobility. The spread of both charging stations and hydrogen filling stations is proceeding apace around the world. Also when it comes to H2 infrastructure, progress is constantly being made. Together with its partners in the H2 Mobility joint venture, Daimler has already drawn up a concrete action plan. The network of H2 filling stations is scheduled to reach 100 by the end of next year. By 2023, there will be a network of up to 400 hydrogen filling stations. Similar infrastructure projects are being promoted in Europe, the USA and Japan.