The complete Guide to using 3S 40A Lithium BMS Battery Charger

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Күн бұрын

In this video the 3S 40A Battery Management System (BMS )module, all components is explained, battery pack preparation for 18650 Cell shown, how to charge, and tests listed below preformed. OverVoltage Protection OVP, OverCurrent Protection OCP, Undervoltage Protection UVP and Short Circuit Protection SCT have been demonstrated.
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Chapters of this tutorial
00:00 Start
01:27 Introduction
06:15 Components
11:27 Schematic Viewed
13:45 Battery protection (schematic)
15:37 Short Circuit Protection
17:56 Preparing Battery Pack
23:01 How to charge battery
26:06 Charge Current Test
28:23 OverDischarge protection test
30:52 OverVoltage Protection test
31:57 ShortCircuit Protection test
we have over voltage, over discharge, short circuit , under voltage protection
Visit resources page for this video: robojax.com/node/1073
please visit our website wattHour.ca
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#wattHourBMS

Пікірлер: 434

@WattHour 2 жыл бұрын

Hello, Free and I ship it for free. If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@amokutoheti599 Жыл бұрын

How about Papua New Guinea?

@johnle231 8 ай бұрын

Got another one to give? 😂

@kamp4252 4 ай бұрын

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@kamp4252 4 ай бұрын

15:21 15:21 15:21

@fellzer 3 ай бұрын

There is no way this guy isnt an educator in real life. This was too good.

@stevedaly62 3 жыл бұрын

One of the most comprehensive videos on BMS. Thank you kindly.

@WattHour 3 жыл бұрын

Glad you enjoyed it! Please subscribe. I appreciate it and helps my channel grow. Thank you

@denbrisko1978 2 жыл бұрын

@@WattHour Great and detail video! I currently building a 3s pack with samsung vtc5a ( max discharge 35A ). What wires should I use? 8awg are enough? Does this apply to the connections with the bms? Thank you!

@soumilbiswas3885 2 жыл бұрын

THIS CHANNEL NEEDS MORE RECOGNITION !!! HE EXPLAINS IT SOOO WELL

@WattHour 2 жыл бұрын

Thank you. please share it with your friend via email and Facebook or other means.

@willi80636 2 жыл бұрын

I've seen many sketchy and questionable videos about BMSes and am happily surprised by the quality of your explanation and your review. Many thanks for your work 👍🏼 You deserve much more subscribers.

@DW11111 2 жыл бұрын

THANK YOU SO MUCH for this great video! This is exactly the style of board I was going to use in a project for a chirstmas gift but wanted more information to make sure I use it correctly. Great detailed explanation! Thank you so much!

@hc3d Жыл бұрын

Very in-depth, probably the most in-depth analysis of this module on the internet. It was valuable to see the actual model number of the original design in this video (hx-3s-fl25a-a), because the module I was using was completely nameless, but identical, so it was hard to find info on it.

@JWolfe104 2 жыл бұрын

Earned a subscriber! I’ve been looking for instructions on building a custom 8s charger for 18650 cells and this is what I needed to understand the technical aspects of these boards!

@randybobandy9828 Жыл бұрын

Very nice video , I have used these boards for a few battery packs I build 2 years ago. They haven't failed me yet. I have the version you are holding at 6:35 and the battery terminals have a metal plate on them so you can spot weld nickle strips to them instead of soldering wires. It's set up so the strips line up perfectly to the cells to keep the strips short. I paid about $3 USD for each in a pack of 3. Very cheap.

@anjdent3446 2 жыл бұрын

Your explanation was really helpful for a novice like me in understanding the BMS. Tqvm!

@facundonu 2 жыл бұрын

best video about bsm's! comprehensive and accurate, yet simply explained.

@WattHour 2 жыл бұрын

Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@corneliussianturi476 3 жыл бұрын

Actualu, I try to seek every youtuber that build batterypack, but they didn't explain about bms as complex as you are Hats of for you sir, excelent explanation :3

@WattHour 3 жыл бұрын

I am glad you found it useful. Please subscribe. I appreciate it and helps my channel grow. Thank you

@fku232 2 жыл бұрын

Finally a guide for newbies, I wish I've found this earlier, very good and in depth explanation. Thanks!

@WattHour 2 жыл бұрын

Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@seenanll4181 2 жыл бұрын

I don't understand all but I can understand some. I want to say it's a great explanation. Thank you so much.

@toshiyasumorita4569 2 ай бұрын

Lots of good info. Thanks for showing all the features, especially the short-circuit protectdion.

@Animalwon Жыл бұрын

I am sorry to say your pronounciation confused me, on occasion but I thoroughly enjoyed your video because of your details and thorough explanations. As someone who is just getting involved in electronics experimenting after many years working in an unrelated field, I appreciate your explanations. Keep producing these videos!

@ayubshaikh9156 Жыл бұрын

Beautifully explained, in detail and data given and cct demystified,………! You have done an excellent job , . Many thanks …….!

@lexbroken8101 2 ай бұрын

Great video, explained like no other video I have seen so far. Thank you, Sir.

@WattHour 2 ай бұрын

You are welcome!

@trailrider6844 Жыл бұрын

Best explanation on KZfaq. Awesome video. Just subscribed

@bubisav123 3 жыл бұрын

Excellent presentation, Thanks

@jj74qformerlyjailbreak3 11 ай бұрын

I’ve been looking for this channel for a while now. I seen it playing but at the time couldn’t sub and later when I went to look at my history it was gone. Finally I have it saved now and subbed. Thanks.

@WattHour 11 ай бұрын

this video was under my other channel youtube.com/@Robojax. I moved it here which is focused on Energy and chargers etc. you are welcome.

@jj74qformerlyjailbreak3 11 ай бұрын

@@WattHour 😂 wouldn’t you know..... I’m subbed there as well. It was meant to be. ❤️ 😂

@johannolte4383 Жыл бұрын

Thank you for this video. I learned a lot.

@freakinccdevilleiv380 Жыл бұрын

Awesome man, very thorough

@LA6UOA 3 жыл бұрын

Great explenation! Thanks for the nice job!

@WattHour 3 жыл бұрын

you are welcome. Don't forget to subscribe. I really appreciate it.

@myappleukmr9256 2 жыл бұрын

Well explained. Thanks a lot Sir!

@quentinharris2845 2 жыл бұрын

Thankyou. I haven't been considering the current I supply when charging. I just connect anything that outputs the correct voltage. Car battery was on the list till you helped me see the light. I've got plenty of Buck converters with current adjust just gathering dust & waiting for a purpose like this.

@confucious100 Жыл бұрын

Thankyou for a very informative tutorial.

@hmtechsvc 6 ай бұрын

Outstanding video sir! Thank you so very very much for taking the time to make such a very good tutorial for everyone to learn from!!! Thank youuuu!!!!

@ahmedshameer104 3 жыл бұрын

Very well explained. Keep up the good work. Subscribed to the channel 😀

@danilocarrara7494 2 жыл бұрын

This is was the best video about BMS! Thanks ! I was figured out about make a test recharging the batteries and consuming it at the same time. My doubt was if BMS manage it or it's just 2nd Kirchhoff law. Of course with a power supply at the same level of the recharge voltage in BMS.

@WattHour 2 жыл бұрын

Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@danilocarrara7494 2 жыл бұрын

@@WattHour thank you very much. But i'm from Brazil. A little bit far away lool. Thanks for all attention!

@nielslangkilde9255 9 ай бұрын

Very interesting and good explanations and nice experiments setups - THANKS.

@sewandehasan2518 2 жыл бұрын

This is a great channel, we must support this channel subcriber

@puhelk Жыл бұрын

Very informative. Thank you

@kevinalejandrocruzmedrano 2 жыл бұрын

Great vídeo. Greetings from Mexico.

@peterv3122 Жыл бұрын

excellent overview!

@huseyinbilalmacit9027 7 ай бұрын

Really helped. Thank you so much.

@davy-zone8709 2 жыл бұрын

thank you man ;, realy very rich content and very educational so detailed , this was realy helpfull

@MR16425 3 жыл бұрын

Awesome and amazing Video about BMS 🥰

@WattHour 3 жыл бұрын

Glad you liked it!

@mohammadshoykot7188 Жыл бұрын

Thanks from Bangladesh

@viralmakwana1485 2 жыл бұрын

Great video thanks for this information

@pdanayal 11 ай бұрын

Very excellent vlog . bro . I will salute your hard work. And the vlog is very informative. Liked from india. Perfect knowledge and very good picturisation . nothing is left very nice and elaborated vlog nicely explained.

@tysonflint 3 жыл бұрын

I searched eBay for "12V 3S 40A Lithium BMS" (without quotes) and results return "Standard", "Enhanced" and "Balanced", but don't know which I should be using. I'm thinking of putting together a few packs for use with my UPS's using the battery boxes on eBay (searched for 12V 10Ah 3S 7P). Thanks for the very educational video!

@WattHour 3 жыл бұрын

you are welcome. the more you pay the more features you get.

@qalyoube5750 6 ай бұрын

Thank you!

@suryas1616 3 жыл бұрын

Clear explanation bro make more like this

@WattHour 3 жыл бұрын

Thank you, I will

@heresjhonny702 Жыл бұрын

Great video!

@WattHour Жыл бұрын

Hi, I don't know but I can't reply to you under other videos you posted. I have a page where I can see all comments on one page and I see your 4more comments under three videos but two of them don't allow me to reply. It does not show your name. your name is just a dot (.) and that could be the reason. Just wanted to tell you because I can't reply for most of your comments.

@mskhanx43 5 ай бұрын

good information love from India🇮🇳

@asvlog222 Жыл бұрын

thanks for detailed video

@WattHour Жыл бұрын

You are welcome

@MrAntocx 3 жыл бұрын

Thankyou for explanation.. 👍

@WattHour 2 жыл бұрын

Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@quintinlarson9499 2 жыл бұрын

Well done, thanks

@Andersonllopestv 2 жыл бұрын

Sensacional explicação.

@TheChrisco1969 Жыл бұрын

You are a genius 👏

@lc7ineo 3 жыл бұрын

Awesome video!

@WattHour 3 жыл бұрын

You are welcome. Please subscribe. I appreciate it and helps my channel grow. Thank you

@azinfidel6461 2 жыл бұрын

Excellent video 👍

@gs637 2 жыл бұрын

Excellent, thanks!

@WattHour 2 жыл бұрын

The best thank you for me is to subscribe to my channel. Your subscription is stamp of rating to my channel and others can find me too. Thanks

@hohowtf 2 жыл бұрын

Appreciate the tests! What's a good discharge rate for the thermals for this board? I'm hesitant to buy this and find out I can't do 30A

@HaiNguyen-vu9cj 3 жыл бұрын

Thank you very much.

@WattHour 3 жыл бұрын

You are welcome!

@buttishah 2 жыл бұрын

Thank you Mr. Mohamed for your helpful videos, can we connect these bmss in series

@azzebouz8483 3 жыл бұрын

Thank you very much.very informative vudeo

@WattHour 3 жыл бұрын

You are welcome

@BAMB00STER4EVER 3 жыл бұрын

Wow this channel is a hidden gem. Nothing like this on youtube.

@BAMB00STER4EVER 3 жыл бұрын

2.3v is very low for over discharge protection. I've been trying to find a cheap board like this, but with higher discharge protection voltage (like 2.7-3v), but all of them seem to go so low that I'm worried for the lifespan of the battery

@WattHour 2 жыл бұрын

The discharge value is determined by the manufacturer. if they say, it will be okay.

@ForwardGuidance Жыл бұрын

@@BAMB00STER4EVER Exactly! 2.3 is way too low for most 18650s and all of these cheap boards have the same specs. I connected 3 batteries too a board similar and one cell is dead since it let it go way low. Another thing I did was put 2 low 3.4 (ish) voltage cells with a one that was 4.0v and it overcharged the 4.0v cell rather than stop charging it while the other cells caught up.

@MinhLe-hb6mi 10 ай бұрын

thank you

@Bianchi77 11 ай бұрын

Nice video shot, thanks for sharing, keep it up :)

@sortofsmarter 2 жыл бұрын

Great explanation, Helps a lot. I have one question, What is Q3 used for?? I'm wanting to try to build my own version of this type of BMS but some boards have that transistor and some dont...

@MrDexi87 3 жыл бұрын

Thank you :)

@WattHour 3 жыл бұрын

You are welcome. Please don't forget to subscribe. I appreciate it.

@DM-fz3ly Жыл бұрын

Good video! thanks for all the detail. Question: Can you use fewer cells than the board is designed for? Can you only install 3cells on a 4 cell board and have it work properly?? Thanks

@Exentrick_stardust 2 жыл бұрын

Complete video on EVERYTHING ABOUT BMS. if you still have doubt , "watch the video again" Thanks.

@evilevogaming3847 11 ай бұрын

Best video thank you ❤️ ❤❤❤❤❤❤❤❤❤❤❤❤❤

@whatwelearn9747 3 жыл бұрын

Very informative

@WattHour 3 жыл бұрын

Glad you think so!

@mdUzzalKhan-xp2fk Жыл бұрын

Love you from Bangladesh ❤❤❤❤❤❤❤❤❤❤❤

@user-se2pb5yx5p 2 ай бұрын

Thanks

@josegregoriogonzalez874 2 жыл бұрын

Excellent video. I have noticed that some BMS boards have a temp sensor input.Can you elaborate on it’s application?

@firepower9966 Жыл бұрын

its actually a normally close temperature switch. it go open circuit when it temp rating is exceed. (usually 40C) this will also cause the main mosfet to turn off. after it cools the switch will again close and circuit will resume normal operation. If board does not come with temp switch one can be added but you need to remove the zero ohm resistor that is used to bypass the missing temp switch. it usually next to where temp switch is soldered.

@edinfific2576 2 жыл бұрын

11:03 OC is not Over-Current protection output, but an Over-CHARGE output, which turns the MOSFET off to stop charging once the battery reaches a certain voltage. Also, I have a BMS board (actually a protection board) which has its P- (negative output for the LOAD) taken from the Drain pins of the MOSFETS.

@WattHour 2 жыл бұрын

Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@dkoxperiakoziukov3808 2 жыл бұрын

Great directions you've maid. Would you be kindly tell how about to reduce batteries charge cycles amount? How to unplug the load from batteries while the charger power supply is on and we need to power on the load from the initial power supply? How to commence the charging only if voltage dropped to a precise value? For example I don't want to get my batteries charging everytime, but after a certain discharge (voltage drop)? Thanks

@seanyfpv 10 ай бұрын

thanks for this! very helpful. I've been thinking about combining this with a lithium polymer pack for easy charging. i do have one question though, if your input voltage is at 12.0 for example, will the battery still charge to the maximum of 12.4 volts? or would you need to raise the input voltage. thanks!

@stephenstrachan-heap5329 2 жыл бұрын

Hi, very informative video, big thank you for the excellent content. The quality of you BMS looks good, can I ask the make and the cost of the 3s 40A BMS please and is there facility to monitor the status of the board? or do you have to buy a different board that affords that option and if so can you recommend some quality products, thanks and carry on with the vlogging you are doing a great job:)

@WattHour 2 жыл бұрын

Hi, you are welcome. This has no make or model. I have provided link in the description of the video. I am not sure how much a seller is truthful to ship the exact item photo they present. but our of 1000 purchase I have seen only 1 or 2 incorrect. in regards to the monitoring, Unless we make custom module I am not aware if there is such things. Good luck and stay safe

@dynamitekillers153 3 жыл бұрын

Thanks sir

@WattHour 3 жыл бұрын

Welcome

@dhaferalzubaidy4773 Жыл бұрын

Hello, this video clip was very impressive, is it possible to put a similar clip about the work of the BMS cards for charging the batteries of the 20-volt parkside devices, please?

@DT11AS 3 жыл бұрын

I am pretty sure that your KZfaq upcoming star for exploring n testing... i subscribed. Keep it up sir.

@WattHour 3 жыл бұрын

Thanks for the sub!

@sammanjre4701 3 жыл бұрын

Very nice information

@WattHour 3 жыл бұрын

I am glad you found it useful. Please subscribe. I appreciate it and helps my channel grow. Thank you

@sammanjre4701 3 жыл бұрын

@@WattHour Thanks

@RogueOntheRoad 5 ай бұрын

The connector with s1,s2 is a temperature sensor input point.

@alperdunga231 5 ай бұрын

You are great at this. But i want to ask a dump question. Do we connect the charge discharge on the same p-/+ ?

@kamaledirisinghe 3 жыл бұрын

Very informative. If you can add the cell balancing observations to the video also, that would be really useful

@WattHour 3 жыл бұрын

thanks. It is here kzfaq.info/get/bejne/ophxg9Bm1NKomXU.html

@Mtiwari4251 Ай бұрын

Good 👍

@E85_STI Жыл бұрын

So for some reason on my BMS and I have 3 brand new ones when I hook them up the voltage on the pack reads 12.50volts but on the B- B+ it reads 11.50v everything has been hooked up to balance wires and when I test the balance plug each series of cells reads 4.15v so the only thing that’s not the correct voltage is the bms. Can I move the wire from B- to the 0v side of the board? When I do that it reads the 12.50v but I’m not sure if this is bypassing the bms or not.

@OmorFaruk-jv7zt Жыл бұрын

Thanks for the great explanation we needed. Just a small question, as this has overcurrent protection threshold about 200mV, if they add 0.025 ohm(two 0.05 Ohm resistor in parallel) resistor in series , the threshold overcurrent voltage should reach at 8A, then how does this provide 40A or more?

@simonilett998 5 ай бұрын

From what I understood, he mentioned the 40A current limit refers to either, (but I'm not sure which) the max charging input current, or the max charging current the module can deliver to the batteries, not the final module maximum output current, but I may be wrong on that. 8A you mentioned sounds more realistic, however, from memory, he did show the mosfets rated at 63A, so perhaps the max module output of 40A is reasonable.

@RayceManyon00 2 жыл бұрын

Great video. I am new to the battery pack world and I learned a lot with your video. What is the small voltage readers you are using 23:04? Thank you so much.

@WattHour 2 жыл бұрын

I checked the time and there was not (small) voltage measurement. But as I continued watching at 27:23 I've shown the current passing from resistors. that voltage can be used using ohm law to find out the current I=V÷R

@tenlittleindians Жыл бұрын

@@WattHour I checked 23:04 and you do have a small voltage meter attached to each cell. I think he was interested in maybe purchasing these tiny digital volt meters.

@ahmedkalas3983 2 жыл бұрын

Very helpful thanks but wanted to know the no. of maximum cells the board can handle as is divided by 3 . 0 v to 4.2 v and 4.2 to 8.4 and 8.4 to 12.6 or is possible to doable the each cell by 2cells in series v will same but capsity will doabled

@ddavid2 2 жыл бұрын

Quite well explained!! Many thanks. I only missed something about balancing. Isn't it included in the BMS?

@WattHour 2 жыл бұрын

It does not have it. I have videos on balancing modules

@ddavid2 2 жыл бұрын

@@WattHour thanks! I'll check it!!

@albertotannus6573 2 жыл бұрын

Nice explanation on this topic. I have a question however: I'm using one of these managers to assist a pack of four batteries (4S) to feed a 14.4 cordless drill. There is a problem, the overcurrent (short) protection trips every time I pull the drill trigger. I wonder if I solve it by shorting the current sampling resistors (and shutting down the overcurrent protection) or there is a better solution for that. Could you please advise?

@drewwollin3462 Жыл бұрын

I have been playing with a knock-off set of 18/20 V Dewalt batteries. Dewalt seems to have the charging BMS in the charger rather than the battery pack. They have individual cell voltages as well as the main connections in the connector. When it is in the tool, there is no overcurrent protection such as there is in the BMS. Having the BMS in the charger cuts costs, for the sack of a more complex connector. The video illustrates just how complex lithium batteries are and the real danger of not charging them properly. There have been a number of house fires locally due to charging scooter batteries. The Dewalt battery pack has 5 pairs of parallel cells in series. So the BMS works with a pair of cells rather than one.

@UGPepe 10 ай бұрын

Try adding a 10-100uF capacitor across the output terminals it should help with the starting current.

@edwinm.8404 2 жыл бұрын

Hi. I have also a 3s bms but the output is less than the supplied voltage when measuring from the P+ & P-. Does it mean, one of the mosfet is dead? I noticed this issue with few bms I have used before after using for some time. I am curious what could be the problem. thanks

@horizonfurnitures8018 2 жыл бұрын

Hi, thank you very much for your guidance, I want to know whether can we connect several BMS seriously on getting more voltages

@WattHour 2 жыл бұрын

Hi, you are welcome. you can't comment more. this is for 3S and if you connect more than 3, it will burn.

@WattHour 2 жыл бұрын

Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it kzfaq.info/get/bejne/Y7uSn7aXuqu9XWQ.html

@dumbingalam8546 3 жыл бұрын

very nice review. What is the main purpose of s1s2 test points and how do I use it?

@WattHour 3 жыл бұрын

Hi, I would not find what they were.

@rosekreuze 3 жыл бұрын

was wondering also for years now, actually

@emesma 5 ай бұрын

Where do you get the documentation for the device marking codes? That is also a hard task to achieve.

@tenlittleindians Жыл бұрын

I realize your video is now over 3 years old but I still have questions. You showed three cells charged to the max and then applied 17 volts to show over voltage protection. I'm wondering what would happen if you applied this same voltage to a drained battery pack. Would the individual cells accept a charge at this point? Is there an internal voltage regulator that would drop it from the 17 volts to the appropriate levels for charging and then cutoff at maximum charge? And what happens if one of the cells is internally shorted such as the middle battery in this case? Would the BMS still manage to charge the remaining two batteries? Would it simply cutoff all charging? Your individual battery volt meters, are they going to read correctly if the middle battery was shorted internally?

@user-fl5fu1fp1z 8 ай бұрын

I think the T terminal is where you connect a temperature, sensor such as a thermocouple, and does not act as a test point.

@nischalalisha34 2 жыл бұрын

well detailed information. if i use this then i wont need dc to dc lm2596 step down buck converter right?? cause m using it to charge me 12v 9a lead acid battery using 20w solar panel and with full sun light it gives 19v dc. so if i directly connect the solar panel in this 3s 40amp bmc will it auto step down and charge and auto cut after battery fully charge?? plz plz reply

@Doviruses.existbaileyonodysee 2 жыл бұрын

Much appreciate you making this lesson. Great for a beginner like myself. Can i ask. If i want to use a .Solar blanket + Solar charge controller. to charge the 12v 18650. Because the solar can go up/down in current. Would the devices @22:38 still be good to limit current?

@WattHour 2 жыл бұрын

Hello, I mentioned that this module does not control the minimum current. it can only prevent the maximum which I mentioned and don't remember the value. Each battery has different maximum value and it you don't control it, it will reduce the life of battery and possibly cause fire due to charge over heat. So you should have a something that controls the current and you set your maximum current there before it comes to this.

@marine1718 2 жыл бұрын

I love the video can you please do a discharge tes of that kind of bms?

@WattHour 2 жыл бұрын

This is only charger. I have videos on how discharging

@marine1718 2 жыл бұрын

@@WattHour Where i can´t find it!

@chrislimck 3 жыл бұрын

Thanks for the video. I am still struggling on what type of charger I should use for a 3S 6P Panasonic NCR18650B with a 3S/10A BMS. I have a 12V/3A & a 16.8V/3.3A charger, which charger is more efficient/suitable to charge the pack?

@WattHour 3 жыл бұрын

you can use this for 3S. the parallel does not matter. input I forgot what was in the video but it can be I think 15V or watch the video. the 6p means 6 cells are in parallel. so voltage does not change. it just adds the capacity. so it will last longer and it will get charger in longer time.

@viswanathanramakrishnan7613 2 жыл бұрын

Fantastic explanation of the BMS and step by step review of the BMS features. Really it has given me the knowledge about the BMS. I wish to change the Ni-cad cells of my cordless drill to Lithium - ion batteries. The voltage of my cordless drill is 12 V. What are the requirements for this conversion and the electronics involved in doing so. Also kindly enlighten me that is it possible to use a BMS for a 3sand4p set-up of lithium ion battery. If so what's the procedure for it and the charging parameters, such as supply volt and current, then the BMS Board to be used. Your reply will help many people who are afraid to convert their drills, and toys having Ni-cad cells to lithium ion batteries. Hope to see your guidance soon.

@WattHour 2 жыл бұрын

I am glad you found it useful. converting this module is impossible. as I mentioned each chip is made for specific voltage and you can't change it. may be we can add components to make it work but it won't be fully automatic. as for 3S4P, when you connect 2 or 3 battery in parallel, this module will see them as ONE. except the capacity increases. But series will change the voltage and it won't work. it will kill the module.

@viswanathanramakrishnan7613 2 жыл бұрын

@@WattHour Thank you so much for immediate attention and response. Now I am clear that altering the ni-cad cells based drilling machines or for that matter is not possible with lithium ion batteries and BMS. That's why people show only the single cells with BMS.

@tenlittleindians Жыл бұрын

@@WattHour His drill is 12volts. A 3S pack charged is 12.6volts. The voltages are correct so why won't it work? Do these drills draw more than the 40A rating of these BMS boards? An electric motor usually just runs slower with less voltage so I would think the pack would work until you got down to the low voltage cut off limit for cell protection. I've purchased four empty 12.6volt battery boxes from Ali Express. These come in kits and include 18650 holders, the nickel strips and a BMS rated at 20A or 40A that's exactly like ones in your photos. Some of the kits use a 3S7P configuration while the others use a 3S10P (3 series X 10 parallel) configuration. Your video made it clear that there's no way these BMS boards can balance charge any more than 3 cells! Ali Express has a lot of vendors selling on their site much like Amazon does here in the States so they are not to blame for these questionable 18650 battery box kits. I do now wonder how safe they are without battery balancing.