Tesla battery cooling explained
The performance of lithium-ion batteries depends their temperature. They do not perform well when too cold or too hot. That’s why Tesla batteries need to be cooled.
Tesla uses a patented water-glycol cooling pipe that winds through the battery pack. The benefit of this approach is that it removes heat from the side of the cells. That’s a larger surface than the tabs – making the cooling system more efficient.
Jalopnik took a look inside the battery pack of the Tesla Model 3 and explains how the batteries are cooled (starts at 6:30):