How about this....
Using the principal of induction, you could transfer the electricity from the charger to the car using coils. Once half of the circuit would sit at the back of the car with a coil exposed. You would back up the car to the charge station and the current would be exchanged from the charger to car using the magnetic field of the AC current. The circuit on board the car would then rectify the current into DC and with this you could charge the battery.
I know this is a "way out there" idea, hell I don't know if it would even work,
but it solves the problem of requiring contact. You would probably need to make your own coils using some very fine enamelled wire. Also the circuit on the car would need to be able to regulate the charging voltage and current (say 1.5 - 3V @ approx 100 - 200 mA) so in the end the circuit might be so big as to make the whole idea not feasable.
Hell, I wan't to try this out now....
See the circuit pic below.
Cheers,
ph2t.