LiFePO4 can still ignite, but it takes more effort as you indicate. Usually uneven discharge on the cells do them in.Almost all the fire risk goes away if Tesla switches fully to lithium iron phosphate batteries (no thermal runaway, non-toxic, heck you can usually drill holes right through them without issue).
plus LiFePO4 batteries tend to last 5x to 10x more cycles. Aren't they used in the Chinese Tesla vehicles?
LiFePO4 is a great replacement for deep cycle applications, but they have some disadvantages vs Li-ion:
much heavier per kwh
more bulky per kwh
uneven wearing, some cells go quicker then others - causes issues for both parallel and series wiring
- when LiFePO4 cell voltage drops below a certain point, resistance drops off quickly. Carelessly wired in parallel will result in other cells in the string discharging through the weak cell triggering failure mode.
- when LiFePO4 is wired in series for higher voltage applications they tend to go out of balance leading to premature failure.
extreme poor performance at low temperatures
- charging the battery at below 32F carries high risk of permanent damage
- complete failure to function at 14F
lifepo4 below freezing - Google Suche
www.google.com
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