Are there any other electric cars with a floor-integrated battery pack other than the Tesla?
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Only if Tesla leases them rights to use their patent on this. Tesla's patent was published on June 28, 2012, so I'm doubting there are any other vehicles with this same technology, at least using Tesla's patent.
I did find a separate patent filing by Ferrari which covers the use of floor mounted batteries in their LeFerrari. I'm not sure how it truly differs from the Tesla design, but would assume it is substantial enough to not get sued by them.
I'm not seeing much else with this type of technology, but there may be some forthcoming.