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Tesla's battery tech is developed by Tesla. Panasonic is the manufacturing partner. Like Apple & Foxcon.

It's said most IP is Panasonic's although Tesla is partner and probably works on tech too for optimizations for the Gigafactory.

I think Tesla was relying on MobileEye for Autopilot. Now they are using NVidia chips instead.

And they always used their own software, it wasn't like a mobile eye product they licensed.

Panasonic just makes the cells, Tesla makes the batteries. Soon Panasonic will be making all the cells under Tesla's roof.

Tesla has hired Li-Ion specialist Jeff Dahn, so at a minimum Tesla is involved is prescribing the additives to their cells to give them the unique properties that Tesla wants.

Tesla has also dictated that the cells have a unique form factor, "2170" instead of the 18650 standard, and most automotive OEM's used prismatic cells instead of round anyway.