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Make sure you are lining the p-packs up with the positive and negative markings printed on the PCB. You will have to insert the tabs through the slots at this point, so it may help to have the PCB propped up with something (I used the empty boxes my cells came in). Splooge a bunch of neutral cure silicone onto the PCB and stick each p-pack down. You know your welder better than I do, so just make sure you’ve got good welds.Īlso make sure you dont accidentally weld a tab backwards, because ripping it off will probably ruin it (assuming your welds are decent).įish paper the sides (or more) of each welded p-pack to protect from shorts. These tabs are 0.2mm thick, so if you are used to welding 0.1mm or 0.15mm, you will have to turn that shit up, yo. I used some little magnets to hold down the nickel tabs while I did my first welds. That would be bad and dumb, and greatly increase your chances of a short. Definitely don’t forget this and then do it later when all the cells are welded and soldered in place. You’re also going to want to solder on the balance plug (or your BMS’s wiring harness) at this point. Make sure you get the rings centered so they cover the shoulder of the cell all the way around. This is also a great time to insulate the positive terminals with fish paper rings. If you are using silicone, get ready to wait 6 to 8 hours per side for it to cure.
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Now hot glue or silicone your cells together into groups of 4.
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You took my advice and bought extras, right? Good. Pretty much just pull any cells that are much lower than the others, and replace it with one of your extra cells. Test each cell with the multimeter first to make sure they are all within +/-0.05v of each other (or as close as you feel comfortable with). 18650 glue guide (I remixed glue guide as his was just a tad too small.).Soldering iron (bigger is better to push a lot of heat quickly).2x m5*10mm button head or socket cap bolts.Solder (I recommend 60/40 leaded flux core solder, but use what you like.).If you are purchasing cells, its a good idea to get a couple extras in case any show up dead or test different than the others. Popular choices are Samsung 30Q, LG HG2, Sony VTC6, and many more. Here is what we are making: Build time ⏱️ (including prep work): 6 hours and 32 minutes ? Today we are going to learn about building a “ DRI 12S4P FlexPCB Battery Kit!” This thing is as simple as it gets, so even a bunch of knuckle-draggers like yourselves should be able to do it, provided that you have the necessary materials and equipment. Andrew, you really need a security system. The Robot is busy, so I robbed him blind and took over his build guide plans.