Mine dont seams to stick, maybe i need more power ?

one of the best build on the entire youtube, you must make more content bro :) very good job.

very very clean build. thanks for the video

ohh... so all i have to do to spot weld copper .. is place a nickel strip over it ? Damn... thanks

Whats the thickness of the copper sheet

19*3.7=70.3 correct me if im wrong. I know that fully charged li ions will be 19*4.2=79.8, but we are talking about nominal and not max voltage right ?

Great technique but you need a better spot welder. The connections are weak.

I think a battery pack is not a toy, not a kind of project where cutting corners, like hot-glueing them together is acceptable, compared to the size of the whole project, ordering some proper spacers is nothing, everyone should use proper battery spacers; First, they are flame retardant in theory at least, second the leave a small 1-2mm space between cells and let them naturally expand and contract as they charged or discharged, warmed or cooled down. That space is important for safety.

Your english is just fine. You speak better english then most my american friends. Thanks for the great video. by the way, the word is sheet. lmao. I'm just playin bro

Any sign of oxidation on the copper strip, great vedio btw❤

The nickel does add a bit of conductivity, the parallel strips should have slightly more conductivity than the series

Viva, obrigado pelo video bem detalhado. Onde comprou as folhas de cobre?

You could use two neodymium magnets to keep nickel in place on the batteries to hold it for welding.

Salut j ai essayer de souder de cette façon il y a rien qui tiens j ai mis la puissance max de ma pointeuse ça tiens pas comment fait tu ?

Where buy copper

Salut tes cellule c est des 21700 30t remis a neuf de chez nkon ?

What copper size sheet do I use if I want to run 100-150amps ?? Please help

Ciao.Alla fine come si comporta la batteria che hai fatto in questo video?

What type of hot glue is that ? I’ve been trying to avoid using brackets but my hot glue keeps coming off

Hi, I've watched all three videos, good job! Never thought of sandwiching copper. Could I just spot weld a sheet of 0.1 copper onto the already welded 0.15x10mm pure nickel strips to reduce the resistance? I've build an 2.8kw 24s8p (three 8s8p in series) paramotor battery out of new Samsung 40 t3 cells from the same company as you. I've uploaded the first flight on KZbin, all went well but it has a high voltage drop at full power that is 17kw, usual load being 4-6kw, and I would like to hear your opinion as how can I improve it because you seem to know things. Others that use similar packs don't have that voltage drop so it must be in the connections and most likely the nickel or the weak welds or the many pre soldering points, some say. I used 0.15x10 pure nickel on parallel groups and 6-7 awg14 silicon wires soldered between series but it's better if you take a look if you have the time and curiosity, I'd appreciate it. I have a post on "Openppg/community/builds/Eppg project-2.8kw battery" with pictures and all. and the flight video is this: kzbin.info/www/bejne/ip2qk6dvqNWXi7s and I have pictures of the battery build in the video. Thank you!

Is the casing the negative cathode?

I tried the same method and the Copper is not sticking to the cells. Tried it between two nickel strips - same thing - it won't stick!

Yeah... Samsung cells are the best. My new favourites are the 21700 48X

I don't see how building your own battery is cost effective when 100 these batteries comes out to $500 + tax and maybe shipping. You can just buy the battery pack pre-built for the same price or $50 more. Building your own battery doesn't make sense unless you have a source for CHEAP cells.

How many amps would be this config......??Quick question, I just got a 72v battery pack 20s and believe is 6p, have 120 cells in it (liitokala 5000) but not sure how much amps really is as it doesn't have any labels.

Trabalho impecável! Like garantido, ganhou mais um inscrito!

Olá quantos mm tem o copper sheet? E qual spot welder usas para soldar cobre? Muito obg excelente conteúdo! :)

Another excellent video! - a year on how is the battery? still working or did you have any issue with the connections breaking free. Id be a little concerned of that happening and arching. Mainly as its not a powerful spot welder at all compared to a Kweld etc also especially on the end with the extra weight of the cables potentially working the connections loose.

Fantastic video. I have the same and didn't realise it could successfully do copper. It struggles with 0.15mm pure nickel. So this is a great option. Is the nickel you're using to sandwich pure 0.1 nickel or is it nickel plated steel? As its just used as an anchor and not current flow wouldn't you get better welding results using nickel plated steel on top of the copper as its easier to weld? Thanks for showing this and what the the little BIFRC welder is capable.

Thanks for the video. Do you know if this method would work with the copper strips that they sell for putting the batteries together?

Thank you for the video. Using copper sheet like this seems like the way to go

A fool is trying to make a bomb. Get knowledge before you do something

How many amps can this much copper handle?

Watching for my 2nd time, realized I didn't like it the first time. And now, 100th like!

That's a dangerous battery where's the wrap for the cells

Hopefully those are transparent cells wraps…… as well as transparent fish paper between p groups. Please build safer.

Thank you for exhibiting copper and Nickel can be spot welded. I learned this technique from you. Thank you once again.

Is that pure nickel or nickel plated steel ?

thanks for sharing the torque arm design

Awesome work only thing I'm worried about is the parallel groups insulation . You can use motor winding insulation for cell isolation and use electric epoxy to glue both ends

Thanks for the video. Use neodym magnet on the top to hold in place the stripes. For me it is working great.

This is gonna burn you know? Look at the positive and the negative is about to short out with each other because if unwrapped cells. Once you ride and shock observe will short them out it gonna burn

The welder is rated at 650A max. How did it hold through?

How many amps are you pushing through yiur pack? 20s5p what's that's 175 amps? Is the copper thick enough to handle 175 amps? Thinking about building a pack and I have the same welder.

How did you go about connecting your BMS balancing wires to the nickel tabs on the cells , I thought the nickel doesn’t doesn’t conduct anything once the copper is beneath it because electricity follows the path of least resistance, just curious as I want to try the copper sandwich method but am not sure if I need to solder directly onto the copper or not , if you see this and reply thanks in advance it will help a bunch 👍🏻

Thank you very much for this video. I am very interested trying this method (with the copper). Something I was considering was using silver solder to braze nickel strip to copper busbar, then weld the nickel strip to the cell, but method looks much more efficient.

Have you had any problems with the battery overheating in anyway or running slightly higher temperature than desired. I want too glue my cells together but I’m worried not leaving gaps between using cell holders that overheating may be and issue , thanks

Great compact pack design , have you had any issues with the hot glue withstanding the vibrations , I see you stripped off the outer casing of the cells did you do this to allow better adherence between the hot glue and the cell , I thought this would risk a short , I am tempted to use the honeycomb cell holders I’m also using 21700 so will be slightly larger

Hello, i really like this 3 part battery build. Im basically using your videos as my bible as i build my own batteries. im making 3 separate packs to suite my ebike (x3 72v packs joined in parallel)20s2p x 3 in parallel so 120 21700 cells. combined its 72v 25.5 AH pushing upto 250 amps but i only need draw upto 90amp & 120a peak. Thank you so much for your detailed videos. My ebay kkmoon 5k spotwelder didn't last and lacked punch, so i bought a Kweld and use my car battery for power supply. I really like the copper sandwich. 2 questions please; 1 have you thought about a protective paint or film to prevent copper oxidation? im thinking spray paint or paint on tape may be enough to set and forget. 2. how much current in amps are you demanding from the 0.1mm copper? im asking 30 amp peak from each cell / series connections cheers

Good Morning, I have Molicel INR21700-P42A cells which can deliver up to 45A in discharge according to the manufacturer I make a 20S 10P 72V 42AH battery. I would like to use 400A in peak but I don't know how to choose the thickness and the way to connect my cables. Do you have any advice to make a safe battery? I had chosen 0.1mm x 30mm copper but I don't know if it is suitable. I have 40A per cell.