Popular Post Keith Posted August 21, 2017 Popular Post Share Posted August 21, 2017 On 16/08/2017 at 5:55 AM, Sven said: i enjoyed very much watching this clip! And he's from the town too I subscribed lol Fascinating in many ways, but Oh some awful soldering at times, and really silly to try and parallel LiIon 18650's with a LiFe battery, the simple logical thing to do, especially as he had allowed the LiFe battery to completely flatten was dump the LiFe altogether and just use 18650's. LiFe cells hold their voltage really well I.e. They will run at 3.3-3.2V/cell pretty much at any state of charge or current draw, whereas the LiIon cells drop from 4.2V down to 3V in a curve. Since parallel batteries have to have the same voltage at all times, the result is he would have drawn nearly all his power from the LiFe battery until it was nearly empty and then the LiIon cells would have been trying to charge the LiFe battery and power the board - messy. 4 Quote Link to comment Share on other sites More sharing options...
Chriull Posted August 21, 2017 Share Posted August 21, 2017 26 minutes ago, Keith said: ... but Oh some awful soldering at times, Yes - a great example of how not to do it. My assumption is, that by soldering connectors like this quite some of the cable melting issues arose... 26 minutes ago, Keith said: and really silly to try and parallel LiIon 18650's with a LiFe battery, +1 ... or paralleling two packs of serialized cells... ... or using no bms for the liion cells... (or at least not showing to use it) he should have played "burning down the house" as background music... ... it's a pity that people without knowledge and experience show such potential dangerous stuff in public and by this animate others to do the same... 1 Quote Link to comment Share on other sites More sharing options...
Sven Posted August 22, 2017 Share Posted August 22, 2017 On 8/21/2017 at 7:00 AM, Keith said: Fascinating in many ways, but Oh some awful soldering at times, and really silly to try and parallel LiIon 18650's with a LiFe battery, the simple logical thing to do, especially as he had allowed the LiFe battery to completely flatten was dump the LiFe altogether and just use 18650's. LiFe cells hold their voltage really well I.e. They will run at 3.3-3.2V/cell pretty much at any state of charge or current draw, whereas the LiIon cells drop from 4.2V down to 3V in a curve. Since parallel batteries have to have the same voltage at all times, the result is he would have drawn nearly all his power from the LiFe battery until it was nearly empty and then the LiIon cells would have been trying to charge the LiFe battery and power the board - messy. I wish this guy sees your comment! maybe he will have the breakthrough he's been seeking!? 1 Quote Link to comment Share on other sites More sharing options...
Mic333 Posted April 25, 2021 Share Posted April 25, 2021 Of course, it is lithium iron phosphate battery, which has now been applied to electric vehicles by some car companies by BYD. Although the energy density is not as good as 18650 or 2170, its biggest advantage is safety. It can resist penetration test without fire or explosion. The safety of lithium batteries has always been an issue discussed in the industry. Although all lithium batteries must pass the UN38.3 test, there are still potential safety hazards, especially when used as power batteries. Quote Link to comment Share on other sites More sharing options...
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