Hey there, let's talk about batteries, one of the most popular battery types is a cylindrical type right and it's like the 18650s, the 2060s 50s there's 32 hundreds uh, there's new 46. 70S. 2170. 700, there's a bunch of them right, but these are all built exactly the same way.

They have this uh steel, canister and the battery is inside. So if something goes wrong with this battery, what happens is that pressure will build inside right? Usually, when something goes wrong inside of a battery gases are created that are not in there, and so these things have a built-in pressure valve so that when that gas gets above a certain uh pressure, then that valve gets released and then that uh pressure gets uh Released right, so this is the reason why these are very safe among the safest batteries right occasionally they do goes wrong. Something goes wrong and you know fire gets started stuff, but for the most part there are billions. Probably trillions of these batteries now that are in use and they've, been used for the last 30 years.

I think the 18650 it's nearing its 30th year of uh production and uh for the most part they're pretty safe. They you can count on them, not becoming a problem right, but here's the thing there are more form factors, batteries and one of the ones that is coming up and it's becoming more popular these days are the prismatic cells. They sort of look like this one right here right. This one looks like a lipo, so these don't have a metal canister and if something goes wrong, what happens with these? Then these start to inflate, and then they eventually i mean eventually they will puncture the the soft uh casing that they have.

This is just a little plastic, metallic and plastic uh line casing that goes on there right, so they balloon. They, like they inflate like a balloon, and you might recognize that in some like. If you leave like uh, we have a laptop here, for example, they haven't used in a while and when we try to close it the other day, we noticed that the screen is flat, but the body is bulging and the reason is because it's the battery, that Is like this inside is already gassing right and that's because it's uh old and it needs to be replaced now, sometimes you'll get like an old, iphones or or cell phones. That will do that and today we are going to talk about that specific subject for these cells right here.

This is kind of a hybrid cell. It's got it's a prismatic cell, but it is in case in a metallic shell right, but the problem is that because the sides are so flat um, then if you don't compress these and it's - and it's got a valve here right - this is the actual valve that It's made so that when it gasses out and the pressure goes above a certain amount, then this gets punctured and the gas and the pressure gets released through here. Keeping this battery safe without you know, burning the risk of exploding, but the problem is that you? What we're doing is we're using a bunch of these batteries to build a different battery arrangements right for 12, volts for 36 or 24 for 48 or whatever, and what happens is that a lot of people out there are not compressing these batteries and what that does? Is that it doesn't let the internal pressure hit the the mark or hit the the the threshold to the so that this can blow right, and so, as a result of that, then your entire battery pack does this or this. These are examples that i found online of people that are using these cells uh and they haven't compressed them.

So, in order to let the safety valve do its job, what you have to do is when you build one of these batteries, you have to compress it, and basically, you just have to restrict the cells from expanding and ballooning like in the pictures right and today. Uh, i'm going to show you a kit that i design is very simple uh, so that we can build battery packs with these cells and then you can still compress them. So, let's go to the bench and we'll show you that okay. So this is what the kit looks like.

It is literally just a couple of plates, some screws, uh all thread, or you know like and then uh nuts right, and this is to be used for these g3 cells, which are very popular right now, and also the c-max cells, which are basically almost identical to These right so what happens with these cells, and that is that this is how we build different uh battery packs right. So you put x amount of these right. If you want a 12 volt battery, then you put four: if you want a 24 volt battery, then you put seven of these uh. If you won 48 or 36, you do 10 and then, if you want 48, you do 12 or 13 right and then you can do multiples of that sort of like in this thing right here here.

There's a 12 volt power module, but it's got 16 cells. So we're doing four cells in in parallel and then four cells in series right. This four cells then connect to the next four and then to the next four to the next four right, and this is a pcb board that i'm designing and it's gon na, be i'm going to have it available in our website. Pretty soon we do have a 48 volt version that is currently available already right, but this 12-volt one that i'm going to be showing you today uh it's coming very very soon, so i'm going to show you how this kit, this compression kit goes right.

It's basically, you put two the two plates on each side and then you just put the um the old thread through there and put the two nuts on the side and you just lightly compress it. You don't have to compress it a lot. This is there so that when, if something ever goes wrong and the cells want to expand, then they can't and then what happens is that then the the safety pressure valves get triggered and then all that pressure gets relieved and then your battery doesn't change its shape And it doesn't, you know, damage wherever you put this battery and stuff. So here we go.

I'm gon na do a time lapse because it's boring just watching someone just wrangle with a bunch of things, but it's very very easy, as you will be able to see all right. So there we go. That's how this is put together, like these are 12 inches long, which we'll do somewhere around 20 cells. So, if you're building a pack, that is that you know anything below 20 cells or less then you're going to have some left over here, which is very easy to cut.

You just take some pliers and then you just cut there we go. There is our first one, all right, so there we go, that is the compression kit for these c-max g3 cells right um. If you wanted to do longer packs right, you can get this one in, i think in longer lengths you could also put a coupling nut in the middle right, so you could put two shorter ones and then extend it. So this is possibilities here are kind of endless uh, it's highly modular system.

I just wouldn't tie them too much right, just hand. Tighten - maybe put some loctite in here. If you're going to have this on a vehicle, for example, or a environment where it's going to vibrate, so these might come loose um, and so that's it very, very simple: to keep these batteries safe right now. If something goes wrong, if you did something wrong or your equipment's malfunctions and uh, you know the bms then gets these cells out of balance uh and they start gassing out.

They create pressure inside then the internal uh valves, then they'll go off without then. These things you know deforming, and that is going to be a much much safer battery uh system for your application, all right, okay, so this is available at jack35.com. The cells are available. There too uh yeah keep stay busy.

Building batteries we'll see you guys on the next video you.