Lithium batteries are only stable in a narrow range of conditions. Most chemistries self-heat during use, BMS often lack a charge stabilization cool-down timer, and true cell impedance monitoring is rare in fast chargers.
To be blunt, if you are running LiIon/LiPol outside the 4'C to 54'C range, than you can be sure the bathtub-curve* will not flatten. i.e. given enough users a fire event becomes a certitude.
One mitigation is a metal cabinet on a concrete floor. You may think this is unnecessary for large lithium battery banks, but as cells degrade they become more problematic.
To be blunt, if you are running LiIon/LiPol outside the 4'C to 54'C range, than you can be sure the bathtub-curve* will not flatten. i.e. given enough users a fire event becomes a certitude.
* https://en.wikipedia.org/wiki/Bathtub_curve
One mitigation is a metal cabinet on a concrete floor. You may think this is unnecessary for large lithium battery banks, but as cells degrade they become more problematic.
Have fun, =)