Recent content by roman2

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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    I've done balancer heat up test. THE GOAL: Temperature measuring on cell during the durability test on the highest possible parameters. SETUP: - ambient temperature 22.8 celsius degree, humidity 40% - room with no mechanical support of air circulation (no window open, no fan, no air...
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    I'm gonna to do the tests so we'll finally find out ;) Stay tuned.
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    I really don't know right now what would be the final price. What I can say right now is that I am aware that the boards have to be cheap and I try to design this with acceptable costs in production, but without loss on quality. My goal is that the price should be like max. 10Euro per one kit...
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    Thanks, You can buy the battery contact on ali: aliexpress.com/item/4000055282831.html I'm sure I bought it much cheaper, try to look similar auctions.
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    You're right. There is one more reason for 2 circuits. I design the solution to be "dummy-proof" as much as possible. For example: I'm imaging like someone forgets to "un-jumper" the circuits before disassemble and makes short-circuit. It's nothing dangerous, the fuse just blow up and that's it...
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    Sure: Placing the resistors near to terminal is good idea, but this place is 'forbidden'. There should be only the wide copper area, this is crucial place, because of big current transmission from pcb to terminal. I don't want to place there anything what could make the transmission be weaken...
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    I know what you mean with the "E" like bus bar, I was looking them, but all of them have different resolution (not 20/40mm). Plastic tube is a great idea! It's so simple. As soon as the stores will be open again I will try it.
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    Bus bar. I see 2 ways to do it: 1. To buy a flat copper bar and make holes in that, sth like: 2. To use standard wire. On the photo in the first post I used 2x4mm2 wire. It could not be enough for big packs, so I found a way how to use much more wire. On the picture below there is 10x2,5mm2...
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    Thanks. Well, you are putting up or off the jumpers only during assembling/disassembling, so I suppose, it's once for a long time, but if they get loose, there is easy trick to make them tight again. You need just to squeeze a little (but very little) the pins with the plier or sth. "Socketed...
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    Hello all

    yep, I'm close to it ;) couple projects successfully done, so far. And starting new one: https://secondlifestorage.com/index.php?threads/battery-sandwich-different-approach-to-diy-powerwall-based-on-18650s.10671/ Cheers!
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    Battery sandwich - different approach to DIY powerwall (based on 18650s)

    Hello, at the beginning I'd like to thank all the contributors in this place. (and sorry about my english in advance) According to DIY powerwalls which are build on PCBs, I saw couple different designs (on aliexpress, etc) but none off them was 100% compliant with my requirements ;) So I...
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    Hello all

    Roman from Poland over here. Hello to everyone.
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