Tesla opened its patents today in a move to spur electric car development.
http://www.theverge.com/2014/6/12/5804122/tesla-opens-patents-to-all
http://www.theverge.com/2014/6/12/5804122/tesla-opens-patents-to-all
I've read a little bit about EV batteries, and found out that while Nissan and GM are using laminated Li batteries, similar to what is in smart phones, iPads and my Macbook, Tesla is still using strings of cylindrical Li cells in a commercial format used in older laptops, newer power tools, etc. Of course all companies describe their choice as the best....
The laminated batteries are generally seen as superior...due to their large area they have less self-heating, better passive thermal control and can be packaged efficiently into different shapes and form factor. Apple had some problems with the laminated batteries a decade ago...these appear to have been solved.....
http://news.softpedia.com/news/Watc...abbed-with-a-Screwdriver-Torched-431108.shtml
But the bottom line is that Nissan and their contractors spent >$1B to engineer an EV battery from scratch and more than that to build a robotic clean room factory to assemble them cheaply. Five years ago. Nissan reformulated the electrolyte in the MY 2013 and later Leafs for greater hot weather durability and long-life. They are selling their second-generation Li battery now, made in a robotic factory in Tennessee, built in 2012. The factory is sized to be scalable to a production of 16,000 Leafs per month.
In comparison Tesla is still using the same cells found in your cordless screwdriver in the model S. And they reportedly suck up more of these cells at this point than any other customer...and there are, surprise, supply chain problems. So they are planning to build a factory to make the cells themselves (for the first time) next year. But its all good, they are 'giving away' all their amazing battery patents.
The 'battery tech' that Tesla developed appears to be in how to thermally manage, balance and equalize these complex strings of off-the-shelf Li cells. And to safe the array in case of a cell short. And to armor the array against road debris.
Yet the Tesla has 3 times the range of your Leaf, and at least 3 times the performance, and yes, more cost, but you get what you pay for.
bonds might be junk, the stock on the other hand! nice move last two days http://finance.yahoo.com/q;_ylt=AsF...3_finance_vert_gs_ctrl1_e&type=2button&s=tsla
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