Do I need to see this before Infinity War?

Not really (just saw it today)...but the IW trailer does have a large battle in what im assuming is Wakanda and there are alot of faces in that battle who also appear in Black Panther. If you want some background on these new characters then watch BP. I assume the battle in the trailer is happening in Wakanda because of either Vibranium or more likely that the Soul Stone is encased in the Vibranium mountain in Wakanda (or under where the heart shaped herbs grow) but that is speculation...no Soul Stone was mentioned in the movie. If they hadnt shown so much of that IW trailer in Wakanda id say its an easy pass but Disney is very clever in their marketing.