This article first appeared in the Bus-News Magazine Issue 2 2023.
BorgWarner’s eFan system supports customers transitioning to electrified commercial vehicles, helping them comply with CO2 emissions targets.
The eFan consists of a large diameter open or ring fan, an electric motor to drive the fan, and an inverter to convert direct current from the battery to the alternating current required to power the motor. Depending on whether it’s a battery electric vehicle or a hydrogen-powered fuel cell electric vehicle, higher-performance eCVs need even more cooling capacity and airflow to cater for the size of the braking resistors or fuel cell modules used.
The eFan replicates the function of the engine-driven main cooling fan in an internal combustion engine vehicle. The fan is still needed in an eCV because despite replacing the engine with an electric drivetrain, there are several other systems that require cooling, such as the high-voltage battery, inverters and traction motors and, if installed, the braking resistors.
The high-voltage eFan demands a lot of power to operate it – anywhere from 5kW for a light truck, up to 40kW for a heavy-duty vehicle – which depletes battery capacity. As this is directly related to the distance the vehicle can travel, ways have been found to minimise energy wastage and optimise fan performance and e-motor and inverter efficiencies in a limited package in the front of the truck. A large fan and electrical motor also create noise, which must be within limits defined by noise emissions legislation. This is even more important because the whole electrified propulsion system is running on very low noise levels overall.
These challenges have been met by using computational fluid dynamics and computer-aided aeroacoustics to design a fan impeller with high aerodynamic efficiency – this has less frictional drag, saving energy. More efficient airflow allowed us to reduce the rotational speed and power consumption of the electric motor to a level at which it develops sufficient torque to drive the fan but minimises sound pressure levels.
Bus-News magazine Issue 1, January 2023: BorgWarner Akasol AG - Ultra-High-Energy Battery System for Electrified Vehicles.
BorgWarner’s battery system exploits the potential of its Akasol battery to lower the cost of ownership for electrified commercial vehicles.
Bus-News magazine Issue 1, May 2022: BorgWarner Akasol AG - Charging Forward to Accelerate the World’s Transition to E-mobility.
The ultra high-energy battery system AKASystem CYC uses new cylindrical-cell battery modules with very high energy density.
The AKASystem OEM: proving powerful, specifically adapted lithium-ion battery systems can be high-quality and affordable at the same time.
The robust, maintenance-free and fast-charging AKASystem AKM is ideal for use in commercial hybrid and electric vehicles.
BorgWarner has been selected by a global power technology leader to supply battery packs for a series of electric buses.
BorgWarner's vision is providing the automotive industry with pioneering innovations for vehicle drivetrains.
The combination of BorgWarner and AKASOL is expected to significantly strengthen the company’s commercial vehicle electrification capabilities.
AKASOL AG will supply GILLIG with the third generation of its battery systems, the AKASystem 9 AKM 150 CYC.
AKASOL AG presents the new AKASystem 9 AKM 150 CYC, offering the highest energy density available on the market.
AKASOL AG has signed an agreement with a major bus manufacturer from Belgium with a total volume in the mid-double-digit million euro range.
One of Europe’s leading bus manufacturers is again extending its cooperation with AKASOL AG and awarding another long-term follow-up order.
AKASOL AG as well as BorgWarner Inc., and Blitz F21-842 AG, a subsidiary of BorgWarner Inc., have signed a Business Combination Agreement.
AKASOL AG has signed a strategically important framework agreement with Turkey’s largest commercial vehicle manufacturer.
AKASOL has commissioned its second serial production line for lithium-ion battery systems at its Langen, Germany, production site.
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