3 ms·
The problem is that batteries themselves don't have a concept of "full". Measuring the state of charge in Li-ion cells is not easy as the voltage curve can be q
by r1ch 5y ago
The problem is that batteries themselves don't have a concept of "full". Measuring the state of charge in Li-ion cells is not easy as the voltage curve can be quite flat, so you have to use all kinds of heuristics to determine what a safe charge level is.
- 3pt14159 5y agoI see. Thanks. I take it thermal differential between battery and outdoor air won't work for some reason?
- r1ch 5y agoBatteries heat up depending on the rate of charge and while it is easy to measure and control to avoid damage from overheating, I don't believe it can be used to measure the state of charge. Charging at home in a garage would likely be using a much slower (and thus cooler) charging method than a commercial charger, so I don't think the fires are caused by the rate of charge, but perhaps by over-charging potentially worn or damaged / defective cells.
- turtlebits 5y agoAre you sure that's correct? The BMS should have a high voltage disconnect and not allow further charging.
- r1ch 5y agoI'm sure it does - the problem is that the disconnect trigger voltage could be a normal state of charge for one cell but a high / dangerous state of charge for another.