Hi I have posted a few times and have now built and destroyed about 6 bikes but have reached the limit of my technical expertise regarding battery technology and am asking for someone to not only be capable of helping me understand advice but also willing to physically show me or help me make up a couple of packs in lithium cobalt ? (repair one and modify another)and make some lifepo4 packs.
not sure if this goes on much in the London area but I thought I would give it a go.
I have tons of ideas but need to be shot down in flames if they are stupid and also pointed in the right direction on bms's/alarms/chargers etc. to purchase
I bought 2 x Chinese tlh 48v n18650 packs in 10a (n18650 s06l l22r1 16507 on the cell)which have a bms built in but they have not been of any standard at all I would probably rate them at about 3 amp connecting strips internally and would like to repair one pack which has 5 dirty corroded/leaky cells out of the 65 fitted in the pack,
after about 5 months use which has now gone short circuit and refuses to charge (this is where my technical ability goes all fuzzy) I don't know if the bms has got the hump or the broken terminal shorting in the pack has done damage or simply leaky cells is the problem but when I resoldered the break I still only have 0.01 v in the pack instead of 54.6v.
the other idea I have is the lifepo4 cells which can be harvested from the 9 packs I purchased as new but uncharged for about 2 years and making up some packs from those as I intend to make an electric motorcycle as well at some point these cells are allegedly 3.7v 10a but I have no way of verifying this (phylion battery 2ga24559ba24558b cells xh259-103 pack) there are approx. about between 7-11 (24v and 36v) in each alloy enclosure,although I have only looked at one of the 24v(25.9) ones so far. (I have put on the numbers on the cells in case they prove useful to the clever people out there ) these will need individual cell charging as they have hardly any voltage and no where near enough for the charger to recognise them but what do I charge the cells with at what voltage ?
also is there available all different voltage bms ?
I would want a 48v 20a bms and charger and a 72v bms and charger and for the motorcycle possibly an 84v/96v bms and charger preferably with alarms for discharge as I will be pushing as hard as they can go with an 11k motor hopefully .
the reason for my change in direction is that my controller stopped on my overvolted bike and when I replaced the controller with a higher amperage very basic eBay one 2 input wires 2 output wires , it seems to be sucking the life out of my functioning 48v 10a/max 25a pack, it has massive torque once rolling about 3x more than experienced with the previous controller but then cuts cleanly and does nothing until the battery terminal is separated and reconnected and off it goes again it was listed as 24-60v and up to 1000 w so sounded ideal but I think I must be drawing more than the battery is willing to give I did try it on a 48 volt 7a lead acid pack that has dubious life in it and it went but blew the 10a fuse and the holder got really hot when I increased the amperage to a 30a replacement
it is a cheap and nasty 180w 24v brushed motor in a 26" rear wheel and needs to be @ about 9-10 mph before using power as it judders and complains below this and it pulls straight up to about 22 mph before cutting but it really loves the high revs at top speed.
not sure if anyone thinks they can help in person or online but I have kind of given up through my lack of understanding how to proceed in reviving and completing the pack build safely .
cheers in anticipation
Darren
not sure if this goes on much in the London area but I thought I would give it a go.
I have tons of ideas but need to be shot down in flames if they are stupid and also pointed in the right direction on bms's/alarms/chargers etc. to purchase
I bought 2 x Chinese tlh 48v n18650 packs in 10a (n18650 s06l l22r1 16507 on the cell)which have a bms built in but they have not been of any standard at all I would probably rate them at about 3 amp connecting strips internally and would like to repair one pack which has 5 dirty corroded/leaky cells out of the 65 fitted in the pack,
after about 5 months use which has now gone short circuit and refuses to charge (this is where my technical ability goes all fuzzy) I don't know if the bms has got the hump or the broken terminal shorting in the pack has done damage or simply leaky cells is the problem but when I resoldered the break I still only have 0.01 v in the pack instead of 54.6v.
the other idea I have is the lifepo4 cells which can be harvested from the 9 packs I purchased as new but uncharged for about 2 years and making up some packs from those as I intend to make an electric motorcycle as well at some point these cells are allegedly 3.7v 10a but I have no way of verifying this (phylion battery 2ga24559ba24558b cells xh259-103 pack) there are approx. about between 7-11 (24v and 36v) in each alloy enclosure,although I have only looked at one of the 24v(25.9) ones so far. (I have put on the numbers on the cells in case they prove useful to the clever people out there ) these will need individual cell charging as they have hardly any voltage and no where near enough for the charger to recognise them but what do I charge the cells with at what voltage ?
also is there available all different voltage bms ?
I would want a 48v 20a bms and charger and a 72v bms and charger and for the motorcycle possibly an 84v/96v bms and charger preferably with alarms for discharge as I will be pushing as hard as they can go with an 11k motor hopefully .
the reason for my change in direction is that my controller stopped on my overvolted bike and when I replaced the controller with a higher amperage very basic eBay one 2 input wires 2 output wires , it seems to be sucking the life out of my functioning 48v 10a/max 25a pack, it has massive torque once rolling about 3x more than experienced with the previous controller but then cuts cleanly and does nothing until the battery terminal is separated and reconnected and off it goes again it was listed as 24-60v and up to 1000 w so sounded ideal but I think I must be drawing more than the battery is willing to give I did try it on a 48 volt 7a lead acid pack that has dubious life in it and it went but blew the 10a fuse and the holder got really hot when I increased the amperage to a 30a replacement
it is a cheap and nasty 180w 24v brushed motor in a 26" rear wheel and needs to be @ about 9-10 mph before using power as it judders and complains below this and it pulls straight up to about 22 mph before cutting but it really loves the high revs at top speed.
not sure if anyone thinks they can help in person or online but I have kind of given up through my lack of understanding how to proceed in reviving and completing the pack build safely .
cheers in anticipation
Darren