Now where could one get this said airflow in a vehicle moving through a medium that is commonly referred to as air? :) Heating up the battery with this airflow

Now where could one get this said airflow in a vehicle moving through a medium that is commonly referred to as air? :) Heating up the battery with this airflow for a certain amount of time should warm them up relatively quickly and evenly since done via convection too. Now I genuinely wonder if there is a reason why Tesla didn't go with that.