What a fantastic idea, untill you crash and the car your driving is infact going to have a good chance of exploding.
The problem with their tanks is that they are very strong and when they break it tends to be the valve. Leaving you with a rocket....a very heavy rocket.
It says in the video they are using carbon fibre tanks so they won't do that. They will split which releases the energy in a slightly more controlled fashion. That's the idea anyway.
Its not a bad idea really. The main problem with electric cars is charging. Short of swapping the batteries in and out of the car you must be parked at a charger for however long it takes. If it doesn't take long to charge you are going to have to put an incredible load on the national grid. But then again all these new things seam to come back to electricity in the end.
This way you can create the stored energy in a fixed place slowly then quickly and easily with few engineering problems transfer it to the car. Its a good idea in much the same way that hydrogen is but without any of the technical obsticals.
Lots of this stuff already exists, compressors are well developed, high pressure stuff is readily available, the engine is probably the only bit that needs work and that's fairly trivial compared to ******* about with hydrogen which WILL explode.
I agree the extra energy conversions are a bad idea but the majority of the new energy sources are nothing of the sort. Just new storage methods.
The main concern I see is that the obvious method of compressing the air is with an electric compressor pump, which is all fine and dandy when there's 1 of you or even a few thousand. But if this ever got good market penetration it would bring the national grid to its knees (although less so than rapid battery charging as you could compress slowly). Especially as the gov have dropped the ball on generation capacity.
