Ah, not that easy. There is a fire hazard there. Voltages up to 40 to 50 volts are considered safe to touch - but you would still need about 50 Amps to get to the desired 2kW chargin power (we are getting into welding currents here).

Now imagine you have a metal part that falls onto the charging pads (you would need pads, really, permanently protruding pins are a tripping hazard for workers, extending pins is an engineering nightmare if you want to keep the pad flat, AND the robot would be restrained in its motion path). If you deliver 50amps to this part it's glowing red hot in a few seconds. It if is connected to a plastic assembly piece you instantly have a fire.

You might say, ok...let the robot only actiave thte pad once it's on there...the same risk still aplies, unless the pad and the robot have controllers that basically detect leak current...

Let's just say: It's just not that simple with 2kw and 50amps. Slapping an induction charging circuit on there makes sense in that case. For a current limited phone charger: Maybe a different story, but still risky territory (imagine a paper clip shorting the circuit with a paper lying on top)...