Enabling Fast Charging - Vehicle Considerations

Andrew Meintz, Jiucai Zhang, Ram Vijayagopal, Cory Kreutzer, Shabbir Ahmed, Ira Bloom, Andrew Burnham, Richard Carlson, Fernando Dias, Eric Dufek, James Francfort, Keith Hardy, Andrew Jansen, Matthew Keyser, Anthony Markel, Christopher Michelbacher, Manish Mohanpurkar, Ahmad Pesaran, Don Scoffield, Matthew Shirk, Thomas Stephens, Tanvir Tanim

November 2017 - To achieve a successful increase in the plug-in battery electric vehicle (BEV) market, it is anticipated that a significant improvement in battery performance is required to increase the range that BEVs can travel and the rate at which they can be recharged. While the range that BEVs can travel on a single recharge is improving, the recharge rate is still much slower than the refueling rate of conventional internal combustion engine vehicles. To achieve comparable recharge times, we explore the vehicle considerations of charge rates of at least 400 kW. Faster recharge is expected to significantly mitigate the perceived deficiencies for long-distance transportation, to provide alternative charging in densely populated areas where overnight charging at home may not be possible, and to reduce range anxiety for travel within a city when unplanned charging may be required. This substantial increase in charging rate is expected to create technical issues in the design of the battery system and the vehicle's electrical architecture that must be resolved. This work focuses on vehicle system design and total recharge time to meet the goals of implementing improved charge rates and the impacts of these expected increases on system voltage and vehicle components.

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