18650 spot welding -how to- ULTIMATE REPOSITORY

[Ozzzz]

Great thread, thanks. Nicely explained and good follow up comments!
I don't expect many AU cell buyers from that link?

 

[ridethelightning]

:lol:

 

[Ballistrophobia]

Looking for different Nickel and Copper options online and came across this: http://www.ebay.com/itm/221895723691?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Would this be a good option? It's 0.1x200x1000mm, which I could easily cut down into 100- 0.1x10mm strips for spot welding. Thoughts?

 

[parabellum]

Looking for different Nickel and Copper options online and came across this: http://www.ebay.com/itm/221895723691?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Would this be a good option? It's 0.1x200x1000mm, which I could easily cut down into 100- 0.1x10mm strips for spot welding. Thoughts?

If you know what you are getting. Reading description it is 99...% Copper, Aluminum paper and Copper Foil Shielding Tape with Double-sided conductive adhesive all at same time. Hilarious!

P.S. 0.1mm is nice gauge, it is easy to cut with Manual Guillotine Paper Cutter, any thicker and it gets difficult. Also note, copper oxidises and it can be randomly triggered, moisture, contamination, galvanic reaction.

 

[ridethelightning]

Looking for different Nickel and Copper options online and came across this: http://www.ebay.com/itm/221895723691?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Would this be a good option? It's 0.1x200x1000mm, which I could easily cut down into 100- 0.1x10mm strips for spot welding. Thoughts?

thats the exact stuff i used, well actually it was this one-
http://www.ebay.com.au/itm/141516612693?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
its not sticky and looks like pretty pure copper to me.

after spotwelding my pack, i clean any grease etc off with isopropyl alcohol and seal the whole pack up in adhesive foam, then heatshrink to stop any moisture getting in.

so far so good. id say the corrosion would only be an issue if salt or water got in there, or perhaps ZnCl solder flux residue.

 

[Tats]

Thanks oatnet for the clear simple explanation-nice one

 

[oatnet]

Thanks oatnet for the clear simple explanation-nice one

 

[Wakkabu]

Looking for different Nickel and Copper options online and came across this: http://www.ebay.com/itm/221895723691?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Would this be a good option? It's 0.1x200x1000mm, which I could easily cut down into 100- 0.1x10mm strips for spot welding. Thoughts?

If you know what you are getting. Reading description it is 99...% Copper, Aluminum paper and Copper Foil Shielding Tape with Double-sided conductive adhesive all at same time. Hilarious!

P.S. 0.1mm is nice gauge, it is easy to cut with Manual Guillotine Paper Cutter, any thicker and it gets difficult. Also note, copper oxidises and it can be randomly triggered, moisture, contamination, galvanic reaction.

That last bit is why I never considered copper plate in my battery pack. Bike battery sees a lot of high humidity levels. Especially when biking in rain. Oxidation is going to happen.
There are some pictures on here of packs made with copper sheets and all of them show the tell tale green spots.

 

[bigbore]

Anybody already bought this nickel strip 0.2mm x 10mm?
http://it.aliexpress.com/item/20m-0-2-10mm-Pure-Nickel-Plate-Strap-Strip-Sheets-99-96-for-battery-spot-welding/32637386068.html?isOrigTitle=true

 

[irq]

if one really feels to be forced using copper, i whould clean it like your mum whould clean your room/flat/house until it really shines. after that, give it a nice shower of plastic spray. this will prevent any further oxidation and all the other nice things copper tends to do.

i dont know a matching product in the us uk or so, this one is a popular one in germany mostly used by electronic repair shops, industry and so on. smells really awful, but sticks forever. but you still will be able to solder through it, the heat is enaugh to burn it away.

http://www.voelkner.de/products/19467/Plastik-70-400ml.html?ref=43&products_model=C91980&gclid=CjwKEAjwzN27BRDFn9aAwLmH2yISJABWuEXcfrlXnOe6QFuXutxxynb7trUyL35MkdcAsE2IUdwQ5xoCaa3w_wcB

i dont use copper, but i give my packs also a shower of that spray incl. the bms (pcb is the main target anyway of that stuff). imho its based up on some kind of transparent acrylic resin.

 

[Samd]

Yep thanks for the summary oatnet.

Gotta admit allex recently gave me a pointer to series the strings first and it didn't sit well. Now I am clear.


Sent from my iPhone using Tapatalk

 

[pguk]

Here's a video where the guy does a fast corrosion test for 2 batches of nickel he bought from china. One rusted immediately in vinegar + hydrogen peroxide + salt solution, one didn't. He shows who the sellers are.
https://www.youtube.com/watch?v=1r2tkwUnNv4

Here's the link to the shop of the good nickel on aliexpress, called Bring Good Things To Life:
http://www.aliexpress.com/store/1315530

I was stung twice before I came across this. I ordered some and can confirm its the good stuff - no corrosion at all.
If you leave a roughed up piece of nickel plated steel in this solution, the steel is eaten away completely after about an hour and you're left with a wafer thin strip of nickel.

Edit: Just seen that this was made and posted by Joss on pg 8 here.

 

[Invisionelite]

subscribed

 

[Nobuo]

I made this calculator for a mosfet type welder and for batteries (specifically JP welder + battery source)
I put a good amount of work into it, so please give credit and keep my contact on there if you modify it. And distribute this read only link.
https://onedrive.live.com/redir?resid=6 ... ile%2cxlsx

Make sure you update the blue values to match your setup. Green values i carefully tweaked based on lots of testing and data... but if your setup is different keep that in mind

One could tweak it to work with a cap welder (hint, major change in the % peak current column is needed - you need to account for the falling voltage of the capacitors based on coulombs discharged) let me know if you need help with that. I spent about 15 minutes giving it a start... added calculated voltage drop @ the cap, now you need to use this to compensate for new voltage and how it will affect the current slew rate and peak current ...

Nobuo can you put in OP?
Would like to see someone develop it more for a cap welder.

Hi, I just notice your proposition, but the link does not work anymore

 

[mudflap5]

Time for a new spot welder. Had a 788H and it has been repaired one too many times. Kicked it to the curb! Posted in the "Wanted" section for a JB spot welder, and it looks like Riba will be out for an extended time. Aside from the cheap ebay welders, is there anything else available that is somewhat reliable for under $1k? I would like to start a new pack build in about 3 weeks, and need to get a new welder.

 

[tomjasz]

I have a new welder that failed on the first run and the vendor sent a new PCB. Beyond my skill level to repair, It's the model with the POS solder station.

 

[mudflap5]

I have a new welder that failed on the first run and the vendor sent a new PCB. Beyond my skill level to repair, It's the model with the POS solder station.

Which model # welder are you using?

 

[tomjasz]

I use a JP now but I bought this POS.

https://endless-sphere.com/forums/viewtopic.php?f=9&t=71712&p=1082569&hilit=sunnko#p1082569

 

[SniperGaulois]

Should the link in between every parallel group of batteries be equals to the total max amperage of the battery?

for example, the middle group of cells in a battery, halway between + and -, which is rated at 40 amps, should be able to transmit 40 amps through it?

 

[flippy]

it is highly advised to have the highest current capacity where possible and every interconnect between each group will see the same current. 40A on the output means 40A on the interconnect.

more never is a problem, less however....

 

[BlueBand]

Hi mistercrash, another question or is it what you are asking is the lower resistance of zinc compatible with resistance spot,

I think it will require a much higher currant (More Toxic fumes + accelerated and prolonged heat) to produce a quality spot weld. I have not yet committed a crime but as soon as my 788H+ is modified (47R Ceramic bridging a SPST with Missile Cover), I will be rebuilding a lot of Snap-On and Bluepoint 14.4v & 18v packs. So power tools for me with 1.8 x 8 x 30mm Nickle Guys/Girls.

Please someone with some knowledge on these subjects (Resistance Welding and Metallurgy) give any credence to this brilliant Idea or pile of crud.

I also require some Ni-Cd SC 2500mAh paper jacket no tab batteries I have just purchased 45 @ £((.00, ouch there must be a cheaper supplier that is reliable and honest in what the batteries real mAh is I hope that these work out at 2200-2500mAh. I have also just received 12 x 2800mAh SC Ni-Cd's ()Plastic coat and Tabs from China Wow what kind of mAh will they push
(I am hoping 1700mAh but alas expect 1300mAh) so at half the price I would not expect any more than half the quality.

David

 

[vince74]

Hi everyone!

I wonder if the sunkko 709a could weld 0.3mm thick nickel strips? (I need about 15A/cell) Or is the 797 more suited (http://www.aliexpress.com/item/Hot-sale-Free-shipping-by-DHL-SUNKKO-797A-Micro-computer-Pedal-control-spot-welder/32563979037.html?)

I found two 709a on aliexpress :
http://www.aliexpress.com/item/SUNKKO-709A-1500W-Spot-Welding-Soldering-Station-with-Universal-welding-pen-for-phone-notebook-18650-lithium/32687537080.html?
http://www.aliexpress.com/item/Free-shipping-2-IN-1-micro-pulse-power-battery-pedal-powered-touch-welder-spot-welding-machine/32598652822.html?

Do you know some seller that are trustworthy for a sunkko spot welder?

Thanks!
Vince

 

[flippy]

709 can manage, they are basically the same unit. just have some spare triacs on hand and improve the tinned traces on the board inside to make it more reliable.

order extra tips or get some tungsten one, at the current level needed for 0.3 you will wear them out fast.

also take time between 10~15 welds and let the cables, handes and tips cool off.

 

[Adverse Effects]

i joined the board to warn you about the 709A

i bought one and plugged it in and turned it on and got thrown off my chair

 

[Adverse Effects]

more pics

the seller wanted to charge me $170USD + shipping to send me a new control board




here is the unit i got

http://www.aliexpress.com/item/Miniature-pulse-lithium-battery-pedal-spot-welding-touch-soldering-Holding-a-spot-welder-Soldering-iron-5mm/2024789149.html