Yes! ... Because you try to solder at max temperature! ... the rosin core (flux) is burnt off before it can work as cleaning\etching\bonding affect.
Too high temp:
evaporates flux = smoke;
tempers tip, so solder won't stick on it, preventing good heat transfer!;
burns-corrodes tip.
I really do not understand what you are saying. (yes) If it smokes and solder wont stick and it burns and corrodes tip then it sounds like either solder is counter productive or I need to adjust the heat as there is a control knob on all three of my solder irons. Two which are brand new.
3/11/21
Ok.
I do not want to solder any more. I tried with no flux and failed miserably.
Also am thinking about how 18650 cells can self destruct like a fire cracker.
Heating up a cell with a soldering iron also can damage the cell as well as turn it into a fire cracker. I felt like I was playing Russian roulette. It could blind me if it explodes when trying to make solder stick.
I remember several years ago ordering a solderless kit from Vruzend. It was a total disaster and very difficult to put together and also remember the pack melting when climbing State Street hill in Schenectady NY. Not a really steep hill but steep enough and about 1 quarter mile. This is their new and improved solderless kit. I just watched the video.
https://www.youtube.com/watch?v=rylbFnTgFI8
I know now that I did not build a large enough pack. I needed about three or four of those packs in parallel to avoid that catastrophe. I was even told by DA or DAN or someone I exceeded the maximum discharge for those Vruzend plastic caps and is why it failed
Since then Vruzend has improved their design. Not sure if the capacity is greater but since I have 200 cells and according to Battery Clearing house can still order more 18650 cells it seems like very large capacity packs are in fact the answer to my problems.
I am not sure but think I was using a 1,000W motor and climbing a hill for at least 5 minutes probably drawing > 30 amps @ 48V and > 1,500W and only running about 12S - 4P.
I am not positive about that as it was years ago but if I build it right and large enough then it should NOT over heat and melt. I am sure there are specs. as to the rated discharge using a DIY Vruzend pack. Not exactly sure what they are but should be able to stay under the current limit and still build a 1,500W - 30 amp pack.
I can also easily hook up my 6S balance connecters and build two large 6S - 10 to 15P packs as well as a 3S - 10 to 15P pack I can wire in series for 12S or 15S.
I can also build smaller 10S - 6P - packs with BMSs for the Bafang motors. I can have several of them as spares to bring with me in a back pack for long distance.
Please let me know. I need to know how many kits or what size kit to order so I can build packs large enough that I dont melt the plastic caps again by drawing too much current. I would like to stay at or less than 50% rated discharge capacity for longer life and greater range from the packs I build.
Please help me if you can figure it all out. I will be ordering the 1,500W hub motor for > 2 kilowatts@ 15S and also have the 3 kilowatt motor and controller so am thinking maybe two 6S - 15 to 20P and a 3S - 15 to 20P pack.
Not sure of the cost of Vruzend kits. I know it was at least $40. Also if there is something better than Vruzend that can do the same thing please let me know.
Thanks.
LC. out.
3/11/21 - 7:37 PM.
Not only is VRUZEND kits out of stock but they are expensive. It would take four or five $40 kits to accomplish anything usable.
Basically unless there is a better solderless option I Will need to build something out of wood that can work. A cell holder.
Once I build it I can use bolts on either end of six cells in a row all in parallel for a 6P pack - 3 to 6S. It will hold the cells firmly together than drill small holes and countersink the nuts in the wood with a small amount of wood glue directly above and under each cell and screw the bolts in from from the outside top and bottom.
If I need more capacity I can parallel two 6P for 12P or for 3 kilowatts 18 or 24P
I thought about doing this years ago but decided against it. However I really think that if designed right it should work. Not sure if hot glue sticks to wood but already found strips of wood suitable for the top and bottom. The cells will be lined up like in the picture but will need smaller thinner strips on either side of the cells so the cells are held in place.
It really is not rocket science. It is measuring accurately where to drill the holes and having about 200 small nuts and washers and having the right wood glue and a drill bit for counter sinking each nut. That and thin strips of wood for each side of the cells and gluing those strips in place.
Obviously I will need to go to home Depot for the thinner strips as well as the nuts and bolts. I can see if hot glue sticks to wood on a scrap piece. If it wont wood glue will do the trick. I will keep you all posted on any progress.
If anyone has any ideas that will work or a cheaper kit to make my life easier please post it.
Thanks.
LC. out.
