A Look at BMW Carbon Fiber Production for the I3 Electric Car
One of our readers, Noble713, commenting on a news items about the BMW i3, asked if TTAC could provide more coverage on BMW’s carbon fiber productions methods. The i3 EV, and upcoming i8, are built upon CFRP structures. Weight is the enemy of electric vehicles. The more weight you can take out of the actual structure of the car, the more battery cells you can carry for more power and better range, hence BMW turning to carbon fiber. It turns out that BMW has released a series of videos (bilingual, wait for the English) on that very topic. Their CFRP production uses materials made by SGL Automotive Carbon Fibers, a joint venture between the BMW and SGL groups and the effort spans the globe. SGL has expertise in carbon fiber and in 2011 BMW took a 15% stake in the company.
BMW has been publicizing how environmentally sensitive their CFRP manufacturing is, stressing how the Washington state facility is powered by renewable hydro power.
While carbon fiber is regarded as almost magical stuff because of its superior strength to weight ratio and the ability to orient the fabric so the resulting parts are stiff in some directions and flexible in other directions, it is still relatively costly to work with, compared to aluminum and steel. Like the CFRP shop at Toyota’s LFA works, BMW is using carbon fiber for the i3 and i8 not just because of those inherent characteristics but also so they can develop processes for the inexpensive mass production of CFRP parts.
Ronnie Schreiber edits Cars In Depth, a realistic perspective on cars & car culture and the original 3D car site. If you found this post worthwhile, you can get a parallax view at Cars In Depth. If the 3D thing freaks you out, don’t worry, all the photo and video players in use at the site have mono options. Thanks for reading – RJS
Ronnie Schreiber edits Cars In Depth, the original 3D car site.
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The video is two years old and the cycle times of the process looked slow to me in comparison to some carbon fiber construction I have seen used in yacht parts this last summer. I wonder how much faster that part in the video is being made today.... Cycle time has been the big problem in composit fiber construction for high volume production dating right back to the 50s and 60s which has meant that its use has in general been confined to either low volume products or small parts of higher volume autos.... Has BMW cracked this problem yet?
There has been a lot of inane noise on this site about 'game changers', well, the BMW I3, is a game changer. And too risk even more guffaws from the rabble, so is the new Gen-7 Corvette. World class performance and build quality for a paltry $52,-$62,000. While I'm at it, I will add the new Cadillac CTS V-Sport to that short list. If I wasn't still helping to fund the grand children's schooling, I would add all three to my garage. Let it fly.......