I didn't found any modules to charge my 11,1 volt LiPo akku, only for 3,7 volt with 5 volt power supply. How can I handle that with a micro-USB connector on my robotplatform?
What exactly are you trying to do? You have an 11.1 volt, 5000mAh battery pack. That is, you have a (11.1*5)V-Ah battery pack, or a 55.5 Wh battery pack.
A micro USB connector can safely pass 9W of power, meaning it would take (55.5Wh/9W) = 6h10m to charge, assuming you could perfectly utilize all of that power.
You should consider instead either:
- Take the batteries out of the vehicle to charge, or
- Put a proper battery charger on your vehicle and use a different connector than micro USB.
There are plenty of integrated circuits that will charge a LiPo battery, but again, I don't think you'll find one that simultaneously uses a micro USB input format to charge a battery of the style that you have because it would take so long.
Trying to hack your own circuit together to get what you want is needlessly dangerous.