BMW iX5 Hydrogen targets 750 km range and sub-five-second 0-100 km/h sprint

The fuel cell must deliver genuine X5 pace

iX5 Hydrogen prototypes are currently undergoing an extensive test programme. Engineers are assessing how the fuel cell, high-voltage battery, electric motors, hydrogen tanks and control systems work together under different environmental and load conditions.

One target is now specific. BMW wants to achieve dynamics comparable to those of the fully electric iX5 and has set a 0-100 km/h acceleration target of under five seconds.

BMW has not yet disclosed the final system output. There is therefore no point trying to predict kilowatts from the prototype's acceleration time. What is known, however, is that the powertrain consists of more than just the fuel cell.

The fuel cell generates electricity from hydrogen and oxygen in the air, the high-voltage battery serves as an energy reserve and power buffer, and the electric motors drive the wheels. The battery enables the system to cover situations in which the driver briefly demands more power than the fuel cell alone can optimally provide.

The same battery captures energy regenerated during braking. BMW's new Energy Master manages energy flows throughout the high-voltage system.

Toyota helps with the fuel cell, while BMW builds the rest of the vehicle to its own requirements

The third-generation fuel cell continues the BMW and Toyota partnership. This is not a new marriage, but the next phase of long-term development work.

For the previous iX5 Hydrogen pilot fleet, Toyota supplied individual fuel cells while BMW developed the rest of the system. The companies are developing the new-generation technology more closely together.

According to BMW, the third-generation fuel cell system takes up around 25 per cent less space than its predecessor. At the same time, power density and efficiency increase.

Compactness matters far more here than an attractive percentage figure in a press release. A hydrogen vehicle must accommodate the fuel cell, tanks and high-voltage battery without turning the X5 into a cramped technology demonstrator inside.

BMW developed an entirely new Hydrogen Flat Storage system specifically to solve this problem.

Seven tanks fit in the battery's place

One of the more troublesome engineering issues with earlier hydrogen vehicles has been tank shape. Pressure vessels naturally want to be cylindrical, while a passenger car floor is broad and flat. The result is usually poor space efficiency.

BMW's new solution consists of seven carbon-fibre-reinforced high-pressure tanks connected in parallel and housed in a strong metal frame. They hold at least 7 kg of hydrogen and operate at pressures of up to 700 bar.

The key trick lies in the package dimensions. BMW designed the Hydrogen Flat Storage module to fit in the same space occupied by the Gen6 high-voltage battery in the fully electric iX5. As a result, the hydrogen version should not take significant space from the passenger compartment.

Production matters even more. BMW can build X5 models with different powertrains on the same production line.

This explains why the X5 is a more logical starting point for hydrogen technology than a dedicated fuel-cell vehicle. BMW is not building one expensive platform for a technology whose sales volumes nobody can yet predict with certainty.

750 km and under five minutes

BMW is targeting up to 750 km of WLTP range for the iX5 Hydrogen. Refilling empty tanks should take less than five minutes.

Those two figures sum up the strongest argument for a hydrogen vehicle.

Depending on specification, the fully electric iX5 60 xDrive offers an initial claimed WLTP range of up to 845 km. Hydrogen therefore does not win purely on mileage. The electric iX5 may even travel farther on a single charge.

Hydrogen's trump card is the speed at which its energy reserve can be replenished. Less than five minutes at a filling station is essentially diesel-car territory.

That advantage naturally applies only if there is a filling station available. And this is where BMW's technologically exciting vehicle meets the far more mundane reality of the European market.

Europe's problem is not the vehicle, but the filling station

A fuel-cell vehicle may be technically excellent, but without hydrogen infrastructure, 750 km of range is of limited use.

BMW itself sees hydrogen primarily as a complement to fully electric cars, rather than a replacement for them. The technology suits situations requiring long range, rapid refuelling and high operational flexibility.

From a European perspective, this is a more sensible argument than another discussion of a “hydrogen-car revolution”. A fully electric car uses energy from the electricity grid far more directly. Producing green hydrogen, compressing it, transporting it and subsequently converting it back into electricity all add energy losses.

Hydrogen must therefore justify its lower overall energy efficiency with other advantages. Rapid refuelling and the ability to carry a large amount of energy are the two most obvious.

BMW is therefore not putting all its chips on one square. The fifth-generation X5 is the first BMW model whose powertrain range includes petrol, diesel, plug-in hybrid, fully electric and, later, hydrogen fuel-cell versions.

The hydrogen vehicle gets genuine xDrive

The new iX5 Hydrogen takes another significant step forward. It is BMW's first fuel-cell model to use electric xDrive all-wheel drive.

The vehicle will also receive the Heart of Joy control computer from Neue Klasse technology, together with BMW Dynamic Performance Control software. The same technological direction controls the powertrain and chassis in BMW's next-generation electric vehicles.

This matters because BMW does not want to create a hydrogen-powered laboratory device whose only interesting feature sits behind the fuel filler flap. The manufacturer stresses that the system must retain the X5's usual dynamics, all-wheel drive and practicality, including the ability to tow a trailer.

A sub-five-second acceleration time supports that ambition rather well. In a large SUV, it already means performance that does not require separate excuses for the fuel cell.

Series production begins in 2028

BMW plans to launch the iX5 Hydrogen in 2028. It will be the brand's first hydrogen fuel-cell vehicle to enter series production.

BMW's Steyr plant in Austria will manufacture the fuel-cell systems. Prototypes are currently being built in Munich and production processes refined, while the Landshut plant will supply additional powertrain components.

The project is also receiving a substantial injection of public funding. The German federal government is supporting the HyPowerDrive project with €191 million, while the German state of Bavaria is adding tens of millions of euros more.

This also shows how far away we remain from a situation in which a hydrogen vehicle competes with a fully electric car solely on market logic.

For BMW, the bet is nevertheless understandable. If the hydrogen filling-station network grows in Europe and elsewhere in the world, the manufacturer will have a vehicle ready for series production in 2028. If the infrastructure does not grow, the same X5 architecture can continue to be sold with four other powertrains.