Lithium battery fires are, if I read the article correctly, VERY difficult to extinguish. AND, it appears that special training and materials are required to do so.
EV BASICS 1O6: How to extinguish electric vehicles fire? | Step-by-step Video Guide
A long continuous stream of water applied to the case of the battery is the most effective way to reduce the temperature within the battery and limit thermal runaway. Once the battery is completely cooled down, the fire is down.
That is my point - E cars should have some kind of fire suppression system built in BECAUSE lithium battery fires are difficult to extinguish and require firefighters to have special training.