First of all I should mention that I just came up with the idea.
Second: this is dangerous if children are in the car.
Third: this will not void the warranty.
Straight to the idea. I came up with that in another topic:Which factors have the biggest impact on battery life?
I believe that removing carpet and metal cover of service plug will allow MASSIVE airflow improvement.
I ask somebody to do some measurements with hot battery (no need for hot weather)
If temperature outside is lower than temperature near the fuse (without airflow) it means heat is trapped there.
If air will start flowing then it will drastically speed up battery heat dissipation.
It is even possible to push cold AC air from cabin onto the battery upper part if vehicle is stationary and
air recirculation is disabled. Tight space between car and battery is ideal for uniform distribution of airflow (stationary).
It is safe only if there are no children inside the vehicle. But for adults it is absolutely safe. Just don't remove the fuse.
Depending on airflow this might have to be closed when driving on highway (15 second operation with thumb-screws).
If this is the case I guarantee a massive change in battery cooldown period while stationary (or heatup for nordic users):
stationary in garage, windows ajar, heat rises:
stationary, climate switched on (remote precool or rapid charging and waiting), windows closed:
Technically that last one is active air cooling
It is possible to install cheap 120mm computer fan and power it using random 12V DC wallbrick, route low voltage DC cable thru window or door.
Or have heavy mod and suck power from onboard 12V battery. 0.2-0.3Amps each hour so 3Ah per shift from 40-50Ah battery - no problem.
It is better to suck air from outside into the cabin. If exhaust one-way flap Leaf has (somewhere in the bottom of the trunk) is light enough
those fans will push air thru it, no need to open any windows.
This will only work if ambient is not as hot as chemistry inside.
If this is an old idea then paste a link here. I would like to know more why is it not practiced.