Відео

FAFO! When I went into this, I knew that I was going to have a massive energy release. But I also knew that it wasn't going to catch fire. Initially, I did expect that it would just release the pressure through the pressure relief valve. But in retrospect, you can see that so much pressure was released so quickly that the pressure relief valve pretty much blew right off the end. I wouldn't do the same test with a lipo cell.

NCM pouch cells will give you the highest density of energy and a very high continuous current output. Unfortunately they are very fragile and usually have a low cycle count (500 to 1000 charge/discharge to 80%) 18650s are well known and reliable, but I do not like them personally. I think 32700's, 4680's, or prismatic Lifpo4 are better for longevity and safety.

@@diyelectrified1289 the 18650 give more charge recharge ?but if fail one or two of them all the battery 72v55ah want repair

@@dimitris000bourgos I think that you are saying is one or two cells can go bad in an 18650 battery pack and that you can simply replace the bad cells. I don't know if you have ever done this before but I have and it is a big mess because of the way they are spot welded together. A battery made from pouch cells is slightly more repairable but dangerous (at least in the way that I configured my pouch cells) to mess around with because one short can cause a big fire. Prismatics are much easier to work with though if one cell goes bad, it's quite expensive to replace.

@@UmmerFarooq-wx4yo I don't have enough cells left to do a whole home system

@@diyelectrified1289 maybe convince a large DIY(?) company to sponsor it working in combination with the firebrigade.

I'll be back

I am using a cheap AliExpress spot welder that I modified. It's not even worth mentioning. All it needed to do was have the switching transistors and I provided the power feed. Each cell is only 1,300 milliamp hours which is really low and almost not worth it for a motorcycle battery, but I'm still going to experiment with them.

I know they do not burn. I tried that with a torch. Doing a thermal runaway test seems beyond my level.

I'm going to run it without a BMS. My rationale being since you cannot over discharge them - I don't need the BMS for that. And when I'm going to charge I will carefully charge them only up to 4v/cell. I will have the ability to temporarily hook up a BMS for balancing purposes

No, mine is a battery operated dual motor dual blade. I don't remember the deck width

It is coming. My day job (military) keeps me busy.

Link is pinned in the comments

@@diyelectrified1289 OH i meant the load tester you are using. Does it have a modelname or number?

@@user-uz9sz3jw5n added to the pinned list 😁

​@@diyelectrified1289perfect, thank you!

Those are those things that prevent weakness from leaving the body. 🤣

LoL. I grew up in the generation that would fall off our bikes from jumping home made ramps and ride 5km home. I don't know what generation you come from but we're likely not the same. 😁

Yup

No lithium. Prolly why they suck a bit.

How to set off thousands of cells simultaneously? I can't think of how to pierce even a dozen simultaneously.

@@diyelectrified1289 brother it's a bomb one goes off the others will also

If you follow the link, you can purchase these ones at $0.60 a cell

x.alibaba.com/15su4z?ck=pdp

Manufacturers saw my video and gave me that link. I don't get anything from it and I don't really want to get in a position where I owe anybody. So I don't really get anything from this link

tenha em mente que perfurar rapidamente a célula da bateria com um prego de metal condutor resultará em um curto-circuito rápido e em uma rápida liberação de energia. Não importa se é lítio ou sódio. Mas com o sódio não há fogo.

🤣 No b'y! I spent some time in most parts of Canada and enjoy picking up the lingua franka. My core accent is south western Ontario. Ayuh! Love the New England accent! Never had fluffernutter before though! 😆

Thank you! I tried to stay outside and upwind but who knows what is inside.

nothing

It will corrode.

Do you not think the one I have at the beginning is not good enough?

4awg

@@diyelectrified1289 Hey again, what measurements were used for the fiberglass board for the tabs of the cells to fold over each other and what were the bus bar measurements.

@@DarkShadowNova hey man!. Sorry I didn't take measurements because this thing was a one-off. And it was my first big battery build. I still have the image files that I put in a laser but honestly I modified several times as I went because like I said it was a one-off and more of a prototype. I don't want to give you stuff that leads you to making mistakes. So just do what I did and arrange yourselves the way you want them and make measurements with a plastic ruler. But be very careful because I saw some Russian guy do the same configuration as I did and he had a short that caused a quarter of the battery to catch fire.

LoL nope

Keep in mind that this is one single cell. Now imagine a large battery pack with hundreds of the cells wired in a series parallel configuration. I’m definitely curious how these would react as a battery pack in a thermal runaway condition.

I think that the issue is the stored electricity. A very similar thing happens with a capacitor. There is no way not to have any danger making a hole in something with electricity inside.

​@@marcoalvarado6793 LiFepo4. As safe as it can get. Still burns, but controlled

There is only a fairly small amount of sodium in the battery Also lithium also reacts violently with water

more like Lithium Ion=termite and Sodium Ion=C4