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Electric Vehicle University - 210b EV BATTERY TECHNOLOGY

THE CENTRAL QUESTION ...
Since the battery is pivotal to my EV, what are the core issues that will allow me to understand battery technology?

COURSE ABSTRACT
A discussion of battery components and fabrication approach, the reasons that building higher capacity batteries are constrained by geometry and technological factors, the key characteristics to assess when comparing battery chemistries, and new battery tech that may lead to significant improvements in those characteristics. To obtain a copy of the EVU study guide for this and other available EVU courses, please complete the form on this page.

Course level: Intermediate

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Electric Vehicle University - 210b EV BATTERY TECHNOLOGY

  1. 1. 1
  2. 2. 2 EV Battery Technology, part 2 EV-210b This course is presented as part of Evannex University—a free, open learning environment that presents concise, video-based mini-courses for those who have interest in electric vehicles (EVs) …
  3. 3. Building a better battery Why can’t we build a higher capacity EV battery What’s the challenge? geometric constraints weight constraints technological metrics 3 Source: http://batteryuniversity.com/learn/article /batteries_for_electric_cars
  4. 4. Specific Energy specific energy—is the capacity of the battery measured in energy output per unit weight (e.g., kWh/kg) the challenge—Gasoline, 13 kWh per kilogram—over 100 times more energy density than a Li-ion battery goal to double or triple specific energy 4 Source: http://www.mpoweruk.com/chemistries.htm
  5. 5. Battery Cost Incorporates the costs of: manufacture of battery cells the battery management subsystem: thermal management system safety system power management system support hardware—power electronics, wiring harnesses, pack housing 5 Source: http://costing.irena.org/charts/electric- vehicles.aspx
  6. 6. Life Span the number of charging cycles that a battery can accommodate before losing 20+ percent of its capacity a function of: temperature—battery performance and life span degrades at temps above 86 deg F charge protocol—whether charging regularly occurs in a fully depleted battery or one that has significant capacity left degree of charging to the battery’s limit 6 Source: http://jervisdabreo.com/thetechcorner/battery -life-vs-battery-lifespan/
  7. 7. Performance the ability of a battery to meet it power and recharging requirements, regardless of its environment to operate effectively in various climates extreme temperatures can impact battery capacity by 20 - 30% the time required to achieve a full charge 7
  8. 8. Safety Few verified safety issues with EV batteries BUT, media obsession Therefore, sophisticated safety subsystem is mandatory ensures no thermal runaway monitors charging and overall power output 8
  9. 9. Specific Power the amount of power delivered per kilogram batteries with high specific power can discharge electricity rap[idly in powerful bursts EV batteries with high specific power allow their vehicle to accelerate rapidly design trade-off: high specific power increases the cost per kWh of storage capacity 9
  10. 10. Li-Ion Chemistries 10 Source: Boston Consulting Group, http://www.bcg.com/doc uments/file36615.pdf
  11. 11. 11 … a free study guide for all EVU mini-courses is available for download from our website … For a complete list of mini- courses and the study guide, visit: www.evannex.com

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