Enabling Fast Charging - A Battery Technology Gap Assessment

Matthew Keyser, Ahmad Pesaran, Qibo Li, Shriram Santhanagopalan, Kandler Smith, Eric Wood, Shabbir Ahmed, Ira Bloom, Eric Dufek, Matthew Shirk, Andrew Meintz, Cory Kreuzer, Christopher Michelbacher, Andrew Burnham, Thomas Stephens, James Francfort, Barney Carlson, Jiucai Zhang, Ram Vijayagopal, Keith Hardy, Fernando Dias, Manish Mohanpurkar, Don Scoffield, Andrew N. Jansen, Tanvir Tanim, and Anthony Markel

November 2017 - Battery thermal barriers are reviewed with regards to extreme fast charging. Present-day thermal management systems for battery electric vehicles are inadequate in limiting the maximum temperature rise of the battery during extreme fast charging. If the battery thermal management system is not designed correctly, the temperature of the cells could reach abuse temperatures and potentially send the cells into thermal runaway. Furthermore, the cell and battery interconnect design needs to be improved to meet the lifetime expectations of the consumer. Each of these aspects is explored and addressed as well as outlining where the heat is generated in a cell, the efficiencies of power and energy cells, and what type of battery thermal management solutions are available in today’s market. Thermal management is not a limiting condition with regard to extreme fast charging, but many factors need to be addressed especially for future high specific energy density cells to meet U.S. Department of Energy cost and volume goals.

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