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Old 01-29-2013, 07:26 PM   #31
deepcdiver
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Looks like it came from a Boeing Dreamliner....
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Old 01-29-2013, 07:56 PM   #32
_cy_
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Quote:
Originally Posted by WayneC1 View Post
The second cause is undercharging of the battery causing a cell to fail. This then generates heat losses at that cell and deformation of the case. This is discussed in the lithium testing thread here on advrider

With the shorai it is important the VR outputs 14.4v to get full charge. other brands such as AntiGravity are fine with a 14.2v VR output
incorrect ... undercharging will NOT cause a LiFePO4 battery to melt. discharging too low results in possible permanent damage to battery. although it's possible to recover battery if charged at .01C until battery voltage recovers to 12.8v or so. then charge can be raised to at lease .5C. preferably 1C charge rate.

LiFePO4 li-ion batteries are inherently safe, unlike lithium cobalt li-ion used in Boeing 787. over charge a lithium cobalt battery by 1/2v over 4.2v full charged... battery could go into thermal runaway (explosion)

vs LiFePO4 has to be subjected to wild abuse (overcharge) to cause to catch on fire. then event will be no where near the violent release of energy with lithium cobalt.

most times you see a melted LiFePO4 battery, it was caused by a dead short, internal or external.

LiFePO4 in 4s config as used in motorcycle is fully charged at 14.65v ... if there's an internal BMS used, voltage will drop to about 13.85v after sitting overnight. if volt drops to about 14.1v, then odds are there is no internal BMS.

most charging systems put out 13.8v to 14.2v ... since full charge for LiFePO4 is 14.6v .. it's not possible to overcharge a LiFePO4 if your charging system is working properly.

this chart is worth having around...


_cy_ screwed with this post 01-29-2013 at 08:05 PM
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