31 May '16, 10am

Battery Lifetime: How Long Can Electric Vehicle Batteries Last?

Battery Lifetime: How Long Can Electric Vehicle Batteries Last?

We now have real-world evidence that controlling conditions in this way can result in long battery life. The Tesla Roadster achieves long battery life with lithium-cobalt batteries by controlling all four of the factors listed: temperature, maximum voltage or full charge, minimum voltage or depth of discharge, and C rate. A cursory analysis of electric vehicle mileage based on 100% discharge cycles yields an erroneous result because it does not consider the effect of reduced depth of discharge. With a range of over 200 miles, and an average daily mileage of about 30 miles, cycle life and mileage is extended. Daily charge defaults to 80% charge, limiting maximum voltage and extending calendar life. Calendar life increases by controlling pack temperature and limiting maximum charge to a short period of time because trips are taken soon after full charge. C rates are reduced ...

Full article: http://cleantechnica.com/2016/05/31/battery-lifetime-long...

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