That is a bit of a strawman argument as then you should also argue for stopping all industry in Germany that has a heavy use of electricity (which battery manufacturing doesn't really compared to other things like aluminium smeltering).

Germany is moving to more renewable sources of energy and Tesla also plans to put solar panels on the rooves of its buildings.

Germany have not took any steps to increase their clean non-intermittent energy sources. Until they do they will be stuck with gas.

Just because you have a battery factory in one country doesn't mean you have to charge all the batteries with electricity from that country, does it?

(Also: "EUs worst CO2 polluter" according to what measure and which source?)

Is CO2 considered as pollution?

Since when is it not?

Ever, AFAIK.

Contributing to the greenhouse effect, yes, but that's never been considered exactly "pollution". (Unless the darn kids have fucked up language again. Geroffmyfuckinglawn.)