Thank you for making this video. I think you've saved people from potential injury. Cheers

1. Know the maximum draw of your motor 2. Match the current output of your batteries to the motor 3. Ensure bus bars can handle the current 4. Create space between cells to allow cooling and avoid short circuits 5. Know the maximum output of your fuses (Use a fuse from cell to bus) 6. Isolate the entire pack from exterior elements and causes of short circuits 7. Temperature control and insulate the battery pack thermal threars

@Jetsonn

Жыл бұрын

Is there really any cooling that goes on with a pack between the cells or whatnot when it’s wrapped in tape and heat shrink and foam and insulation material inside a closed plastic or metal case? It’s not like the open air of you cruising down the street is passing over the cells and dissipating heat 😂 I don’t think the spacing of your cells matters unless you’re going around poking holes around your battery case or have a fan or some sort of heat-dissipating material or something

@diogocoelho496

7 ай бұрын

@@Jetsonnis more in case of short circuit the metal shell outside the cell is the negative and the plastic is very fragile

@snorttroll4379

3 ай бұрын

threars?

I appreciate what you have done here. I've seen lots of people making videos but none really explaining so far

@ElectricVehicleSpace

Жыл бұрын

Glad to help

Thanks for your info

What a great video. Thanks tons for the info.

@ElectricVehicleSpace

2 жыл бұрын

Glad it was helpful! Please share and like!

bro killer video very informal thanks for taking the time to create this.

@ElectricVehicleSpace

2 жыл бұрын

My pleasure. Also take a look at the lucid video about their modules and how they implemented the safety fuses.

many thanks for info 👍👍👍

The theory in the video is good but it just does not explain what a DIY hobbyists should do. You said to not solder the fuses but unless you have one of those machines you can’t really do it in another way. For small packs it’s okay to not have cell level fusing and just spotweld the pack without fuses. The fuses add additional resistance to your pack and make it a bit more fragile.

@creeperproof2

3 жыл бұрын

amen

@glasslinger

3 жыл бұрын

Just keep in mind that it can burst into flames at ANY time from a defective cell or dendrite formation.

@blise518B

3 жыл бұрын

@@glasslinger if its an internal cell problem no fuse will save you anyway... when one burns the others go als well.

@glasslinger

3 жыл бұрын

@@blise518B Oh shit! I guess I will stick with alkaline batteries and throw them away every week! :)

@ElectricVehicleSpace

2 жыл бұрын

@@blise518B the fuses will! It's shown in the video how it works and it's explained!

that fuse machine is amazing

There'll be a revolution in battery assembly fairly soon. Cylindrical contacts that fit into drilled holes in a sheet is the easiest straight forward way. Cylindrical contacts are basically insulated cables or wires engineered into being electrical contacts. I've been working with a company in the US to bring their contacts to the battery space. Their contacts are originally used for pcb testing in industry. Custom cylindrical contacts can have enough conductors to reach currents as high as 60A. Imagine battery construction like this, 1. Place cells all in the same orientation(positive side up) into a cell holder. 2. Place sheet with Cylindrical contacts which has cell holder features bellow it for alignment and a pcb(pcb can have built in fusing) or foil above the sheet with contacts. Cell holder, sheet with cylindrical contacts, and pcb/foil can all be joined together(bolts or laminating meaning adhesive) becoming one assembly. 3. Screw down assembly with a cover and batteries built with all connections to bms already made. No fancy robot or time consuming welding process needed. Similar cylindrical contacts making contact to cells can also make contact between batteries final pos and negative aswell as voltage sense to a bms within batteries cover. No wires or ribbon cable coming from battery except pos and neg out of bms and something like a couple wires for communicating with an inverter or the like. SSA or single sided assembly, negative connection is made to cells rim on positive side. Allows for one cell holder, contact sheet, and pcb assembly per battery instead of two like with DSA or double sided assembly. DSA is good for high current builds but SSA can also be quite high current just not as easily. Also the cylindrical contacts within a sheet will be many times cheaper and smaller footprint than contacts like leafsprings and aren't soldered to pcb.

@waverley41

2 жыл бұрын

what's the company called?

@GENcELL2014

2 жыл бұрын

@@waverley41 HCD Inc (High Connection Density Inc) makes this style of contacts.

@soutasiantraveller6493

2 жыл бұрын

great idea 💡, this can save thousands of batteries whose lives are reduced by soldering and other things

@MrSup911

Жыл бұрын

@@GENcELL2014 Any updates on your efforts towards making this system a reality? Sounds like a great step forward!

@GENcELL2014

Жыл бұрын

@@MrSup911 yeah at this point it's been refined from a sheet with contacts to fairly small contact carriers(one variation for positive and another for negative on cells rim) which'll be mass produced and then populated by HCD cylindrical contacts to achieve very low cost contacts and accommodate many variations of series and parallel connection batteries more easily. Contact carriers are sandwiched between cell holder, pcb or metal sheets and a rigidity sheet or pcb cover with bolts holding everything together. Contact carriers are geometrically held in place with simple geometry in cell holder instead of double sided adhesive sticking them to pcb. Not using adhesive simplifies and lowers contact cost by avoiding having to order and manage custom shaped adhesive that needs to be accurately applied to a fairly small contact carrier.

Very great video, thanks for that 👍👍

@ElectricVehicleSpace

2 жыл бұрын

Thank you! 😊

Excelent video!

6:55 I could watch this all day

That's the cloolest thing I've seen in a long time. I'm guessing that machine the one that looks like a sewing machine is using some kind of epoxy??? So satisfying watching it complete the circuits of the battery. I can't believe how efficient and cheap these batteries are getting! I've been experimenting with lithium iron. I can't believe how efficient the cells are. I read something recently about aluminum air batteries or salt batteries. Can't wait to see the progression of everything electric and energy in general. They know waaay more than we're being told! As far as technology.

Really informative and useful video. Though now I know what not to do, how am I supposed to do it?

@ElectricVehicleSpace

3 жыл бұрын

testing the spot welder soon and you will see there.

@lithiumalan776

2 жыл бұрын

Hi, Patrick, i can provide bms and holder etc.. if you want it , please contact me .thanks

Outstanding video! So many "cheap" no-name commercial batteries DO NOT follow much of this advice! Take a shortcut and burn your house down?

Thx!!

Hey great video do you know where I can get these fuses wire

@ElectricVehicleSpace

2 жыл бұрын

Thanks I made them

appropriate cell level wire for 2170 packs? best method to put those into a bus size vehicle EV conversion?

.. From Italy...great intro... 👍

@ElectricVehicleSpace

3 жыл бұрын

Thanks! 😃

@nameno544

3 жыл бұрын

@@ElectricVehicleSpace can you safely run lithium ion batteries in parallel if the batteries are the same?

@pianojacq

2 жыл бұрын

@@nameno544 Yes, and even when they are not the same, provided that they are at the same voltage when you join them and that all of your series blocks are the same total capacity give or take a few %.

@nameno544

2 жыл бұрын

@@pianojacq thanks

can i ask you recomendation gloves when build battery pack?

@ElectricVehicleSpace

2 жыл бұрын

Good idea to use gloves 👌 but that for high voltage. I only worked on max 12S packs. It's not really needed in my case.

Awsomeeee information

@ElectricVehicleSpace

3 жыл бұрын

Thanks ✌️

I was thinking about making a battery pack specifically for powering a computer away from the house, do you think I could use this to get away with that (I'll need a few extra pieces to control the voltage and amperage as well but as far as the battery goes what do you think)

@TheExplosiveGuy

2 жыл бұрын

As long as you have a current limiting circuit and can output a constant voltage as the pack drains it should be fine, I don't see why it wouldn't work. As long as it doesn't go over the operating voltage (usually 20 Volts with a 5% safety margin, which means don't exceed 19 Volts) and is current limited it should be fine. Make sure to include a low voltage shutoff circuit so you don't go below the cells minimum voltage or you'll scrap the batteries.

@hussalojr5916

2 жыл бұрын

@@TheExplosiveGuy Thx man

@charlesthomas8375

Жыл бұрын

@@hussalojr5916 Thats pretty much what a laptop is, Go for it

Could please you make a detailed guide on how to make it right?

@ElectricVehicleSpace

3 жыл бұрын

i just did

@JamesBiggar

3 жыл бұрын

@@ElectricVehicleSpace Nope. You didn't. This is a classic "they did it wrong but I do it right and I'll show you" video that slams actual builders to piggy back on their success but doesn't show better alternative BUILDING methods - it's just a quick, vague overview of common sense principles that should be considered in the PREPARATION of the build. ​If anything, this video just added to the confusion for the layman. Exhibit A: you say don't solder the cells, then proceed to show a clip of fuse wire soldered between the cells and say that builders need to do this but you provide no alternative to soldering. How do you 'fuse' fuse wire to the cell without soldering? Should have mentioned nickel fuse strips that can be spot welded instead. That would be a good start on the road to providing detailed information.

@ElectricVehicleSpace

3 жыл бұрын

@@JamesBiggar I shown the pack with fuses that was spot welded.

@ElectricVehicleSpace

3 жыл бұрын

@@JamesBiggar I am going to review in a week or so I cool portable spot welder and I will show again best way to do it. I did test these fuses and they worked and save the battery and the board from catching on fire. I have not build motorcycle batteries but it should be the same principle. I hope I do build an ebike soon if I find a place to weld.

@MrSummitville

3 жыл бұрын

@@ElectricVehicleSpace What is the amperage rating of the Fuse Wire that you used between the cell and th ebus bar ?

So many great points. I can't believe people hot glue their batteries together for ebikes that are going to vibrate down the road, it's an absolute recipe for disaster.

I saw a snip of my video in there. Would have been nice if you asked before using it but that's up to you. I agree cell level fusing has it's place but I think it could do more harm than good with DIY builders who can't achieve the same precision as on an industrial level. Your basically filling your battery with a bunch of resistors that will create more heat on top of what the battery is producing normally.

you talked me out of modifying a battery pack I have. Probably for the best. Thanks!

Hey! does anyone know if I can actually connect a 12S battery pack with a 13S battery pack in parallel? I think the BMS of the 12S stops loading when it is full while the 13s will still charge up. And when I've run the 13s empty enough, the Bms from the 12s starts up again and both batteries discharge, right? Sounds like it could work, or am I wrong somewhere?

@DKSanX

9 ай бұрын

I know Im mad late but if memory serves correctly if they are in the same arrangement ie Xs then you can just go and add them in parallel but you cant if they are not. The reason being is that each pack is a different voltage. When wiring anything in parallel they must be the same voltage and can hold and discharge the same amount of energy. If you wanted to make them equal you would have to add another set of batteries in series to the 12s and then get a bms that can handle a 25s pack. You could in theory run the packs with a bms but you would need to monitor both the charge rate and full charge of each cell along with the pack and make sure to never run the batteries out fully. Tldr no you cant but with a little tool work you can but youll need a new bms. Just remember batteries in parallel dont drain one after another they drain at the same time its just adding more cells adds to the reservoir it can drain from.

Thanks for the video. Where can i buy this kind of battery

@ericornhag1615

3 жыл бұрын

Google 18650 litium battery 3,7 v

@lithiumalan776

2 жыл бұрын

Hi, we can supplier

What is the machine that is connecting the batteries with the tiny wire at the end?

@pauls5745

2 жыл бұрын

spot welder

Do you consider problematic if receiving new li ion cells at 3.44v? I've received my new 21700 Samsung INR 40T3 4.000mA, 35A cells with 3.44v. Is that too low? I've builded an 2.8 kw 24s8p battery for an electric paramotor and has a huge voltage drop at 10-17kw full throttle and it should handle it like other similar batteries. I'm trying to find out why. Thanks.

@henrikgure2123

7 ай бұрын

No, it should be fine just the capacity may not be 100% more like 80%.

@Seneslau07

7 ай бұрын

@@henrikgure2123 Hmm, interesting point. Other battery builders told me they also received cells at this voltage and it is normal. But your ideea might explain the voltage drop at high loads..

@imho7250

7 ай бұрын

The new laws pertaining to shipping lithium ion batteries requires the SOC not exceed 30%, thats why you no longer see cells arriving at 3.7v like before. As far as voltage sag, just look at the average sag reported by your Bluetooth BMS, and the amps, divided by your cells in parallel, then find the manufacturer’s datasheet or a test from Mooch, and see of your cell sag is following what’s expected. 17kw is about 25a per cell in 24s8p and thats the realistic CDR of the 40T, and it will sag from 4.2v down to 3.7v in a few seconds. Of course proper battery construction is also important. Especially giving each P cell its dedicated current capacity to the next series. There are some batteries only giving 4mm^2 for 450a series connections.

@Seneslau07

7 ай бұрын

@@imho7250 Thanks a lot for enlighten me! Someone even asked me where I bought the cells so he can avoid! Others said is ok and they received the same. I'm on my 5th flight and I love it. The 2.8kwh batt gives me 26min flight time and I land with 43% left, 1.8-2kwh drained from the 2.8kwh batt so I could go a little more. I have no bms, have temp senzors, voltage alarms etc. Level flight is at 3.8kw load, climbing at 5-6kw and take off at 7-8kw so no need for more than that. I even mounted a thermo probe on the pure nikell strip that's on parallel connections thinking maybe it gets hot but it has same temp as the cells. They go to 43C at the end of flight which is fine. I've posted about this on the Endless sphere forum endless-sphere.com/sphere/threads/help-in-identifying-voltage-drop-overheating-reason.121079/

Can you fix my battery pack it had a couple bad cells

4:30 Whoa... so there is no need for trial and error projects, huh? The fuses follow the same principle of amp vs capacity

Was curious about that large water cooled motor at minute 3:10. Could you tell me the name of the motor/supplier? Thanks

@ElectricVehicleSpace

2 жыл бұрын

there is no scooter at 3:10 time frame

That's good theory on how to build safe Li-ion batteries, the problem is when you buy commercial products like laptops or e-bikes/scooters with batteries that clearly don't follow those steps.

I'm doing a tiny house project and would a battery that can be charged by solar panels. How much would it cost to have you build a battery for me that can support 2x PlayStation 4s , 2x small TVs and an air conditioner.

@ke-kd8ut

2 жыл бұрын

3k

May you take similar approach to BMSs topic as in this video? The cheapest one are only resistive and that is just loss of energy and I'm wondering how does tesla do the balancing for example - I'm sure not the resistive way. Cheers

@ElectricVehicleSpace

3 жыл бұрын

There is a lot of info to discuss about the bms. I already removed 2 comments that are not related and the other guy is talking about using tape etc... things that should not be used and people don't understand the basics. I thick BMS is more complex and will confuse people than help. If someone decide still to make DIY packs they should invest more time to and learn all aspects of how to choose the right bms and how to properly use it. There are so many bad quality bms no on the market. You need to know which and where to buy it from.

@elomoto1993

3 жыл бұрын

@@ElectricVehicleSpace that's what I ment writing the previous comment. There is plenty of tutorials and vids about the cheapest BMSs. What is more most of them gives incorrect info that can't be trusted. To be honest after pretty darn good research I'm still not sure how the tesla or any other battery pack made out of modules connected in series should be balanced

@pianojacq

2 жыл бұрын

@@elomoto1993 You can use passive balancers using resistors to burn off the energy in the batteries that reach the maximum voltage (typically 4.2V) first, or you can use an active balancer which uses a charge pump to move the energy from those cells to the 'laggards'. Over a typical charge/discharge cycle you'll see that the difference between the highest and the lowest voltage groups in a string will be a few mV at best unless there is a serious problem. But over time those little differences accumulates and that is why you have to keep a pack balanced, if you don't you risk deep discharging and overcharging of the weakest cell group, and possibly even having it go negative. This is a serious danger, hence the need for a proper BMS, which senses the voltages of each cell group to mV accuracy and corrects where necessary. Cheap BMSs will simply shut off the charging when one group reaches 4.2V, and during discharge the other way, either 3.0, 2.8 or even 2.5V is reached they will halt further discharge. More advanced BMSs will work behind the scenes to keep the batteries balanced to avoid that situation leading to a longer pack life, and much lower risk of battery damage or worse.

El problema no siempre es la batería, el problema también es o puede ser causado por los mosfet, todo controlador brushless estan conectados en paralelo los mosfet y el capacitor, que pasa cuando un mosfet se pone en corto? Pues va directamente a la batería y más cuando el fusible no adaptado a quemarse a un corto circuito, deberían de poner en serie un diodo en el + por si hay un corto, así ya no va directamente a la batería el corto circuito.

@daviddelatorreperez4

3 жыл бұрын

Saludos desde la ciudad de México 👍🇲🇽

Avendo un po di batterie 18650 da 3.7v E volendo costruire un pacco batteria per un scooter elettrico La batteria che monta lo scooter E di 60v 20ah Come li devo montare..... Quanto batterie mi servono e con quale schema montarle E poi o trovato un controllerxhe protegge 60v e 35ah i rete Va bene Grazie dell'aiuto.

Excellent video but will BMS's make a difference in preventing thermal run off or no?

@ElectricVehicleSpace

2 жыл бұрын

The bms does not prevent that but fuses will.

@GarrettRC5thscaler

2 жыл бұрын

@@ElectricVehicleSpace Thank you

@rickybobbyracing9106

2 жыл бұрын

@@ElectricVehicleSpace fuses? On the BMS? Or do you have a any links to how fuses and be used to prevent this? I'm just getting into them and i want to be safe.

Great info. How do you look at commercial packs manufactured by the ebike manufacturers and their suppliers (such as Bosch) that do not use individually fused cells but instead connect them in parallel using thicker strips and have a single overcurrent protection circuit on the BMS?

@ElectricVehicleSpace

2 жыл бұрын

Can fail easily and not safe. A opened a super 73 ebike battery and it had fuses so its happening

@pianojacq

2 жыл бұрын

@@ElectricVehicleSpace Interesting. Even the latest models Bosch packs (the 'Powertubes') are not fused. Do you have pictures of that arrangement in that pack?

@pianojacq

2 жыл бұрын

@@ElectricVehicleSpace By the way: these fuses are not there to protect against discharge currents, they are there for when the cell is internally shorted out to prevent the *other* cells from dumping their charge into the one that is already failing. This may prevent a fire. Typically this is used in vehicles against a pack getting crushed or damaged during an accident and the rest of the pack instantly dumping all of their charge into the cells that have been damaged causing them to explode. I think this is a fundamental piece of information that you were missing when making this video, or, if you did understand that it doesn't come out in a way that explains it clearly. So we are definitely not protecting against overcurrent discharge with these fuses.

@ElectricVehicleSpace

2 жыл бұрын

@@pianojacq that was the all point of the video and it is explained 👌

@ElectricVehicleSpace

2 жыл бұрын

@@pianojacq also overcharging or overloading or shorting.

3:35 Okay so the type material and size of material holding the current is directly associated with the amount of energy passing through it... 🤔

Nice & Thanks :)

@ElectricVehicleSpace

3 жыл бұрын

Welcome!

The thing is we all want more speed and range so I expect to see more videos of battery fires.💯

@ElectricVehicleSpace

3 жыл бұрын

if people continue to build them incorrectly than yes...unfortunately

@racerx2095

3 жыл бұрын

@@ElectricVehicleSpace 💯

@JustNel

2 жыл бұрын

@@ElectricVehicleSpace I am in the process of buying an eScooter and was looking at packs to extend the range.. do you have any specific packs you can recommend or what i need to look out for? Thanks

Someone should make diy wire bonding machine for cells that didn't cost much

So I want to build a battery pack for a camper. It will see extreme temperatures. My first thought is I need to climate control the batteries. Very little is mentioned about this anywhere. Another thought is that I want it repairable. Something that battery packs wrapped really tight are not. Thirdly, I want the system to be self diagnostic. Not something that is common with battery packs let alone with DIY builds. Sadly it looks like I will need to engineer my own solution. Thanks for the video.

@pianojacq

2 жыл бұрын

For a camper I would look at Yinlong Lithium Titanate Oxide batteries. Not cheap but a really nice set of properties, as well as very high mechanical stability.

I store my cells in my bedroom. over my bed. in a cardborard box. no electrodes toucing. any tips? can I store them outside in minus 25 C? I want to make a safe system.

@ElectricVehicleSpace

2 ай бұрын

Best battery storing location.

@snorttroll4379

2 ай бұрын

At least that way one can keep track of them@@ElectricVehicleSpace

hy where are you located? could you build me a 150- 300kwh boat battery pack? for a 12kw engine. i have to stay under 3.5 tonnes everything included, but for transfer i could swap out the motor, clothes some movable stuff, liqueds and even the battery if possible :)

The video isn’t clear enough, It’s understandable but the edit is very choppy. But overall, it is defiantly informative

@ElectricVehicleSpace

3 жыл бұрын

it tells you what not to do when building a battery. Now if you are referring to a configuration of a battery, that is a different story.

Dont forget to use BMS, and always a plus to have a load balancer, my cells stay super healthy and balanced :)

@ElectricVehicleSpace

2 жыл бұрын

new video about batteries coming stay tunned.

@snorttroll4379

3 ай бұрын

are there bms's that allow us to balance each individual cell rather than each parallell group? or is every cell in parallell balancing itself?@@ElectricVehicleSpace

Seems like it should be common sense, but since it's not... Great video!

@ElectricVehicleSpace

3 жыл бұрын

thank you. i hope it helps.

@MrSummitville

3 жыл бұрын

@Bo Davis - Since when is Electrical Engineering called "Common Sense" ? Cell Level Fusing does *NOT* guarantee the a P-Pack will never catch on fire ...

@bodavis3819

3 жыл бұрын

@@MrSummitville wearing your seatbelt does NOT guarantee that you won't die in a car accident either, so I guess I'm missing your point. Also, if "electrical engineering" is such a concern maybe there are other avenues to take in being educated than KZread. I was mostly just being facetious in my comment, but I guess that wasn't common sense either.

@MrSummitville

3 жыл бұрын

@@bodavis3819 Cell-level fusing does not prevent a fire, so then what does cell-level fusing do? Can cell-level fusing actually become a false sense of security = dangerous ?

👌🏼👌🏼

sodering cells is fine. listen to this i did a test on a brand new 1500 mah " samsung" but it wasa chinese fake i think. anyways i decided to find out how damaged cells would get whe heated to just below thermalk runaway, multiple times. I used a blowtorch a held it on both the positive and negative ends of the cell, then out it back into the tester. AFTER DOING THIS 7 times witha blowtorch the results were that the mr increase by 10 and the capacity ddecrease by 50, basically nothing, even with a blowtorch I didnt damage the cells. But I have experienced thermkal runaway 4 times now and I know hoew scary it is but unless you pass that threshold heat does NOT damage the cells

@ElectricVehicleSpace

3 ай бұрын

You are just lucky. Don't play the rullete game...

Assuming that the poles won't contact the opposite is the first reason that causes short circuit Most battery explosion happen due to dangerous design flaws I've been using li-cells for a decade for many applications but never had a single short circuit incident

I just want to make a 60v 20amph battery for my bike so I can put on a better controller and motor

They need to make the solid state batteries because they don't catch fire when they are punctured.

@BrieoRobino

3 жыл бұрын

You say that like its that simple.

@Helpsmallbusinesses

3 жыл бұрын

@@BrieoRobino I didn't mean to make it sound simple. If it's not happening there's a reason that I don't understand.

@pianojacq

2 жыл бұрын

There is a lot of work done in this field. LiFePO4 is the main contender, but the density isn't quite there yet.

I am always watching your video. I am running an electric board club in Korea and have 17,000 members. I want to collaborate with you when I have a chance.

@ElectricVehicleSpace

3 жыл бұрын

pm me

Very interesting. I know nothing about batteries, but it seems the battery industry, and the raw materials used to build them, is going to grow even more with the auto industries push for electric vehicles. Which I suppose is good, but what about the environmental impact of mining for the raw materials, and the human toll?

So wait a second. Why the categorical dismissal of hot glue? If the cells are appropriately spaced, say with silicone o-rings, there wouldn't be anything inherently unsafe about keeping them together with hot glue would there be? Of course, assuming that everything is well isolated with fish tape or whatever.

@snorttroll4379

3 ай бұрын

hot glue melt. hot glue people too greedy and dumb to keep cells spaced. no way for cell to drop out of pack if hot.

@kevinmccray8351

2 ай бұрын

@@snorttroll4379 Based on your spelling and grammar I don't think you've earned the right to be calling anyone dumb m8.

Josh

aw man. It ended too soon 😅.

@ElectricVehicleSpace

2 жыл бұрын

what exactly?

@Doviruses.existbaileyonodysee

2 жыл бұрын

@@ElectricVehicleSpace haha. No it was just really good to watch. It could have been an hour long.😁

wonder if someone actually have a battery at the size of building

@ElectricVehicleSpace

2 жыл бұрын

tesla may have something close to that size.

@metatechnologist

2 жыл бұрын

Yea there really is. Tesla sells solutions for power companies. The battery for the seed bank in Norway is huge.

alot of things work to build lith ion batts, there's is not only one way to make them....?

@ElectricVehicleSpace

7 ай бұрын

Yes but it has to be safe

What are you talking about? Lithium batteries have under one mega joule per kilogram energy density while TNT has 4.6. gasoline has 46.

My super expensive bosh battery pack does not have individual cell fuses...they are solid spot-welded 6P in 10S config...go figgure...

@pianojacq

2 жыл бұрын

Yes, this is pretty common. I think that the reason Tesla uses individual cell fuses is that their packs have so much spare capacity that an individual cell dropping out isn't going to cause a problem, the packs are never fully charged or discharged and the rate of discharge per cell is low enough that the fuses in practice will never go. But when packs contain fewer cells having a good cell drop out is an immediate cause for concern, and the biggest risk is a bad cell that starts to discharge itself and its neighbors at a high rate. That's why the BMS in a Bosch pack tends to brick the whole pack if it believes that one or more cells are faulty (the dreaded 'LED 2-4 error', which is not user resettable). Clearly, Tesla has the capability of creating very precise fuse wires, they wirebond them to the cell and the bus bar, and they can do this with such repeat accuracy that the wire will blow at a predictable current. Doing this in a hobbyist setting is going to be very hard to replicate accurately, I would expect at least a 50% variance from one such cobbled together fuse to the next if it isn't done robotically as the video shows.

@snorttroll4379

3 ай бұрын

nope. just use a wire of known proportions. or use glass ampulle fuses. @@pianojacq

I remember when companies were going to make hydrogen powered cars and everyone screamed about how dangerous it was. Now cars are being powered with Li-Ion batteries, and no one is saying anything.

@Awrethien

2 жыл бұрын

Well they are still dangerous but in different ways. Despite what the news reports explosive failures of Li batteries is extremely rare. More like a fast burn much like standard fossil fuels. When a pressure vessel with a combustible gas fails and there is a fire a spectacular failure *is* the norm.

"Because Tesla does it" is not enough to justify the bold statements in this video.

After dying from my apartment exploding from my DIY battery, I would highly recommend You listen to these warnings & be safe!

@sailingavocet

3 жыл бұрын

absolutely~

TNT has an energy density of 4.6 million J/kg ->4.6million J= 1.278KW hour, lithium-ion batteries' energy density ranges between 260-270 wh/kg. TNT 1kg = 1.278kw/ hour, lithium-ion batteries at most 1kg = 450wh/kg Why are you saying lithium-ion batteries have more energy density than TNT?

Why i should watch Tesla Videos.Thos Cars blowing up too

@ElectricVehicleSpace

2 жыл бұрын

They are the best and have less accidents versus the rest of the world

not to downplay safety concerns, but LI batts are only mildly dangerous. not extremely so as stated in the vid. extremely dangerous is the level of household mains

@pauls5745

2 жыл бұрын

I would say most accidents with battery packs result from underestimating current capacity of connections and wiring. I see so many ppl using like 12awg wire trying to build 50A packs but you know it's gonna get hot at that draw

I can see why most people pay 3-4x more for premade lifepo4 batteries. I'm wayyy too dumb for this.

@snorttroll4379

3 ай бұрын

the premade ones do not come with this. so it's just a ripoff.

think we need a lot of sand deposits near every road when electric cars gets more popular, as sand is the only way of make the fire more controllable

@ElectricVehicleSpace

Жыл бұрын

We need technology not sand.

@snorttroll4379

3 ай бұрын

what do you propose to stop runaway batteries? perhaps that they drop out of their holder and onto the ground if they become too hot? a string holding them up that melts and lets the cell fall either into the ground, or into a safe area in a pack. perhaps each cell should be spring loaded.@@ElectricVehicleSpace

Dude no, cell level fuses are not practical or even a good idea. If the fuses pop you are very likely to lose control and crash at high speed. I would rather try to slow down a burning board or scooter then be thrown off at 40 mph Please don't spread miss information about electric vehicle battery's. Cell level fuses only make sence in much bigger packs or with reclaimed cells where the failer rate is much higher

@ElectricVehicleSpace

3 жыл бұрын

So wrong!!! I tested a board at 40mph and the entire group of cell on one side (pack was 12S4P) 1P disconnected and the vesc just went off and the board slowly came to a stop. I thought the vesc died but after seeing the heat shrink melted I saw the fuses worked. Before writing none sense do a test!

@infiniteoffset

3 жыл бұрын

If fuse pop, then you are in a lot less trouble riding board without brakes, than riding potential fireball, which will also have no breaks, because after the short there will be no power. Key is to have right fuse so it doesn't blow prematurely.

@infiniteoffset

3 жыл бұрын

I have been riding single 40A fuse on 10S dual motor setup with each VESC set to 50A and never popped even on hill climbs.

@creeperproof2

3 жыл бұрын

@@infiniteoffset yes one main fuse is a good idea, however cell leval fuses is stupid , first off can draw 40a per cell there is no cell fuse on the market for that, second. yes if you where on a perfectly flat nice tarmacked road, sure you could roll to a stop and bobs your uncle your fine. however if you are on a steep hill or off-roading having a brake failure could literally kill you.

@creeperproof2

3 жыл бұрын

@@ElectricVehicleSpace HAHAHA, please tell me how i should place a cell level fuse for 40a, please I'm waiting......

Your first statement is completely false and misleading.

Just more propaganda, move along