Or even a little vent that is synced with brakes/speed sensing logic (pitot static system) that has turbines inside that will spin with the induced air and charge the battery a bit?
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If you try and recover energy from air while driving you also create drag (which is where the energy comes from), which means you need to put more power to the wheels, making the RATS pointless.
If you do it while braking any energy you could recover from air can be recovered much more efficiently, and without extra hardware by braking with the motors.
RATS on an airplane are for emergency use only to power critical systems and keep the plane controllable when things have gone terribly terribly wrong. In an electric car you would just lose power steering and should still have a mechanical emergency brake.
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