Hi guys!
I m looking for a best way to weld my two battery pack of Lginr18650hg2 . The idea is make two 6s12p battery pack without bms . For the charge i want to use a balance cable with a balance charger and for the discarge i want to put a lipo alarm into the both pack! Do you have some advice about spot welder pen or something else? Thank you!
I bought a malectrics arduino based welder for mine. For high power builds, it seems that copper+nickel sandwiching is a good way to go.
Recently I found an interesting one that used copper bus with resistor legs acting as per cell fusing.Basically tesla pack style building.
Lots of good battery building info over on endless-sphere. I’m still learning how to effectively navigate this forum.
I just bought a kweld kWeld – complete kit | keenlab
Wery happy with it.
I used a china sunkko before.
This is so much better than the china welders
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Hi X.omega
I have recently welded my pack using a supercheap 17 € welder from aliexpress https://es.aliexpress.com/item/1005001774470934.html?spm=a2g0s.9042311.0.0.274263c0f7jAK7
I worked very well, but if go for it you must change a couple of resistors before welding first time to protect the welder. I could provide you with instructions to do so.
This is the result:
I would also recommend you to use cell spacers like this:
https://es.aliexpress.com/item/4001050422939.html?spm=a2g0o.detail.1000060.2.1f7968dfotvJxe&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.169870.0&scm_id=1007.13339.169870.0&scm-url=1007.13339.169870.0&pvid=403c966a-6243-419c-b155-a84ebbc0acfa&_t=gps-id:pcDetailBottomMoreThisSeller,scm-url:1007.13339.169870.0,pvid:403c966a-6243-419c-b155-a84ebbc0acfa,tpp_buckets:668%230%23131923%2345_668%230%23131923%2345_668%23888%233325%2320_668%23888%233325%2320_668%232846%238110%231995_668%235811%2327173%2314_668%232717%237558%23121_668%231000022185%231000066058%230_668%233468%2315612%23387_668%232846%238110%231995_668%235811%2327173%2314_668%232717%237558%23121_668%233164%239976%23880_668%233468%2315612%23387
Good luck !
and also nickel strip:
https://es.aliexpress.com/item/1005001295868944.html?spm=a2g0s.9042311.0.0.274263c0f7jAK7
you can also find good quality nickel strip in nkon
Hope this help you !
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Thank you so much!! I have already bought it, I’m waiting for it to arrive! Nice battery pack!!!
ok, please let us know your results
regards !
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Hello JGT, can you repost the cheap welder and the resitor to replace?
or are there any cheap welder options nowadays?
Thanks a lot
I’ve done a lot of research into this as I would like to start building my own batteries, and currently, it looks like the best cheap options are the Malectrics (https://malectrics.eu/) and Battery Hookup’s supercapacitor welder (Ultimate DIY Super Capacitor Spot Welder – Battery Hookup). Malectrics is very well known, Battery Hookup’s is newer but I hear people are liking it and that it works well. Haven’t bought it yet myself but I have bought other products from them before.
Another option is more commercial welders such as Sunkko and the high-power AwithZ welders (e.g. AWithZ UF20B- 10.5kW Spot Welder), but both are more pricey and the Sunkko’s don’t have a very good reputation. AwithZ don’t seem very widely used but I haven’t heard anything bad either. (Update: I was just reading some posts over at Endless Sphere where they were recommending AwithZ!)
kWeld is the gold standard but is very expensive especially in the US.
Personally I think I would buy the Battery Hookup welder since they are cheap and the shipping is fast/cheap since I live in the US. If you live in the EU then the Malectrics might have cheaper shipping.
As for the cheap $20 welders like you asked about above, I’ve heard very mixed things; some people mod them and say they work amazing, but they do require modding (digging up obscure youtube videos to find info on the one you bought 
) and the reliability is probably not great. If you went that route I would probably be prepared to buy several of them as there is high probability of failure 
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Fantastic answer! Thanks a lot!
As I have some coupon on amazon, did someone had a chance with those kinds?:
(clearly a chinese tool, but at least covered by amazon warranty…)
They are around 60€, they claim to weld up to 0.3 and comments are not too bad…
But it seems too cheap to me to be a good alternative… what do you think?
For the US market, checkout www.diy500amp.com
The owner, Nelvick, is a great guy that does a lot for the DIY battery building community
He knows everything and can definitely help you with the right welder.
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If you choose Malectrics, don’t buy a lipo battery. Mine is dead after one year. I think that car battery is better.
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Or a capacitor bank plus a psu.
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If you really want a lower price point like that, a better option is probably AwithZ UK1 (AWithZ 9000W Battery Spot Welder, Rotary Knob Operation 100 Gears Adjustable Foot Pedal Operated, 0.1-0.3mm Spot Welder with Dual Pulse Output, Portable Spot Welder for Making DIY Battery Packs (UK1) - Amazon.com). Similar price point and looks much better to me; has many reviews.
The UKF10 (AWithZ UKF10 Professional Super Capacitor Farad Spot Welder for Battery Pack Making, Repair, Powerful for 0.2mm Pure Nickel & 0.35mm Ni-Plated Steel, 3 Modes w/Smart Pen (UKF10) - Amazon.com, also at diy500amp) is probably much better I think but again more expensive.
Second @DutchFoiler; I’ve heard a lot of good things about diy500amp.
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