E-MOBILITY
The 9 AKM battery pack can equip buses with battery system capacities twice as high as those offered by current generation batteries
ULTRA-HIGH ENERGY
C
ompared to electric cars, electrified commercial vehicles (eCV) demand significantly different
priorities from their batteries. For cars, initial purchase cost, energy and power density are primary considerations, but for eCVs, the total cost of ownership is critical and largely dependent on the number of battery replacements during the vehicle’s life. Mechanical robustness, longevity, compact size and battery weight are more important for continuous, long-term usage while keeping vehicle payload capacity as high as possible. BorgWarner has developed an ultra-high energy (UHE) battery
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www.engineerlive.com
Battery replacements have a critical impact on the longevity, performance and cost of electrified commercial vehicles. Specialised ultra-high energy battery systems could provide the answer
system for energy intensive electric drivetrain applications operating at up to 750V. Battery life is up to 4,000 cycles, and compared to technology currently in use, significantly increases electric vehicle range. Cells can be optimized for power to enable opportunity charging for urban traffic, or optimized for energy density for long distance traffic that charges overnight.
BATTERY PACK SPECIFICATION BorgWarner’s cylindrical cell (CYC)
battery modules serve as the power source in the UHE battery pack. Each CYC module contains 600 Li-ion cells giving an energy density of
about 221Wh/kg; nine modules are connected in series to create a 9 AKM battery pack providing 98kWh at up to 750V. Weighing only 560kg and measuring 1,720x700x300mm, this compact, energy-dense solution can equip city buses and intercity coaches with battery system capacities of 400–1,000kWh depending on vehicle size – twice as high as the present generation of batteries.
BATTERY MANAGEMENT AND COOLING The battery management system comprises an in-house developed battery management unit and cell supervising circuits plus
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