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What is a Battery Management System / BMS?

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What is a Battery Management System / How does a BMS work?
I go through the theory of a BMS and why they are so important in a lithium battery bank. I then show a practical example with a battery balancer to equalize cells in a battery bank due to the issues with charging cells in series.
This is a lead into a closer look at the SBMS4080 made by ElectroDacus - / electrodacus
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Опубликовано:

12 авг 2024

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Комментарии : 161

@jedics1 8 лет назад

You explained BMS better than anyone else Ive come across, thanks.

@sreekumarUSA 7 лет назад

Hello Martin, I have been watching many many instructional videos regarding charging Li-Ion Batteries and BMS around it. But, none of the instructions were able to explain as elaborately and as the simplest way, you have explained. Your teachings just went into my brain and I could understand the basics of charging the above cells. You are a great Teacher. Thank you.

@gideonlapidus8996 Год назад

Your explanation is great Martin. Really enjoyed watching this.

@billerwin7770 3 года назад

Thank you very much for providing what I believe to be the best intro to BMS video on RU-vid. Clear explanations, no hype. I definitely benefited from your video!

@digitalwasting 9 лет назад

Your video is so helpful in getting me brain actually understanding BMS now :) Thank you so much !!!!

@mjlorton 9 лет назад

Miguel Bodega Thanks for the feedback.

@randall1fc616 3 года назад

Yes, I agree with S.Kumar. Lesson taught in a clear and concise manner, very easy to understand even for someone like myself, who has zero knowledge. Thank you, Martin. Keep such good videos coming. Cheers!

@udai4k 5 лет назад

simplifying things and explainign is an art, and only peolpe who nderstoodthe concept can do that, you are one such expert! thank you

@jimmyday3984 7 лет назад

I've been watching a lot of battery videos with reasonable comprehension, but everything you said was so clearly explained and well presented I understand it all perfectly now! Thank you, you're a champ :)

@vigneshwarrajc6629 4 года назад

Hi Martin , understood the working of BMS in one shot from your video even for a person who is new to batteries and related electronics like me.

@JulianIlett 9 лет назад

Thanks Martin. Nice introduction to battery management systems and cell balancing. Looking forward to your review of Dacin's SBMS.

@proyectosledar 9 лет назад

totally agree with my friend.

@mjlorton 9 лет назад

Julian Ilett Thanks Julian.

@devendrayadav7409 5 лет назад

@@proyectosledar eying cc to get your own home and I will have the same as

@valhumble1609 3 года назад

Thank you for sharing your knowledge. And your edited presentation is very well done.

@quintinkruger9103 3 года назад

I am a software engineer that studied electronic engineering. Figured I wanna get my hands dirty with some electronics. Going to build my first electronics project which is a solar powered battery bank. This lekker video will definitely help me ! You are a great teacher !!

@MrGoogle87 7 лет назад

Great video, very easy to understand! Better then a video just showing the wiring =)! The drawing was perfect

@johnbrevard5966 6 лет назад

Amazing!... I learned more here in the first 2 minutes than anywhere else on RU-vid!!! in a week !!!

@MLFranklin 3 года назад

This is a very helpful description. Thank you for sharing it.

@smge1lc 8 лет назад

Awesome presentation; well spoken with great illustrations.

@daniele_go 6 лет назад

Hi Martin, this video is by far the best I have ever seen on BMS ! Thanks a lot!

@MaxGoddur 4 года назад

Thank you a great job on the information and delivery of the subject matter video.

@dalendru 3 года назад

Excellent video. Thanks for the clear description!

@alexfladung 6 лет назад

Love the way that you explain things in a way that even I can understand. Thanks!

@New_World_Disorder 3 года назад

Excellent video! Thank you for the clear explanation!

@nrgraff 4 года назад

It's been several years since I studied physics, so I'm pretty rusty and never got too advanced. But I was able to follow and I learned a lot, so thanks! I just got an electric bike with a big lithium battery, so I was curious for that reason. Good to know a BMS is a safety feature in addition to a way of extending the battery's lifetime!

@The22v10 9 лет назад

Awesome, BMS. a technology all its own... Looking forward to the next one with the Solar controller..NICE work Peace

@infopluschannel 4 года назад

very clear and good explanation. thx u

@adam1273123 9 лет назад

Great video. Finally got my head around battery balancing.

@mjlorton 9 лет назад

Adam Al My pleasure, thanks for the post Adam.

@rashidkhan-pd8cf 3 года назад

great explanation.many thanks

@poovertech9368 6 лет назад

Good Tutorial ，some suggests below : 1 - 18650 batteries whether in series or in parallel into the battery pack is a certain requirement for the battery, especially when used in series, the battery voltage, internal resistance, capacity as much as possible requirements, the voltage difference of 20mV, internal resistance difference of 10 milliohm, capacity The difference between 20mA is reasonable, 2 - especially the batteries with too much internal resistance connected in series will cause fever, and serious will cause smoke to catch fire. Be careful! 3 - There are also battery packs to pay attention to the problem of short circuit. Note that only high-temperature adhesives, barley paper, nickel and other accessories are used to avoid scratching the battery skin and scratching the skin. Dont suggest to diy the lithium ion battery pack if you are not known all these knowledge of battery balance management detais .

@Avionics1958 9 лет назад

Excellent video. Although i have many chargers and balancers to charge up my batteries i have one charger that only charges through the balancer wires and that i can see now that charges each battery individually which is why i always liked it as the batteries always charge up well balanced.

@cptglen 8 лет назад

Wow, Thanks. I've been converting my JarCat Catamaran to electric, and have really feared treading into the Lithium ion battery packs. I've got 2400 watts of AGM's, at 210 lbs. 660 watts of solar, and an MPPT charge controller, but, I'm really looking forward to the conversion (and understand it a bit more) and the weight/power savings. Thanks again. Really good Job.

@electrodacus 9 лет назад

Great video Martin. I can not wait to see the review on my SBMS. It will probably be one of the most detailed feedback that I will get about the SBMS. I'm already thinking about the new version and all the feedback from SBMS users is extremely important.

@williamrosar2370 7 лет назад

Thank you now I understand the importance of balancing the cells

@Hopeless2013 8 лет назад

Martin you are an outstanding teacher very good presentation of the BMS and how they work keep up the good work and I hope to see a presentation of the Lead Acid Batteries because that's what I use in the e- bike that I have. I got me one of those e-bike kits conversion kits and it's being working good but the batteries are big and heavy. I going to buy the some Tender Lithium Iron Phosphate Batteries and I would like to know if they do have a BMS within the battery.

@seshachary5580 Год назад

GREAT EDUCATION tHANK YOU REGARDS

@nieuwegeljo5645 5 лет назад

Great video with excellent explanations! Thanks.

@tomasstrom1343 7 лет назад

Thank you! Trying to decide if i dare to buy a complete imiev electric car battery pack ( the car was in a crash so i can buy the cells quite cheap ) but i have so many questions about lithium bateries. Thank you for helping me understand the general idea behind bms! Tomas/ sweden

@7328971 9 лет назад

thank you.I test electrodacu's sbms4080. for some days as solar charger and on my ebike too.it's exactly what I need for my precious lithium cells. looking forward for the review!

@Mazel_Tov_888 5 лет назад

great job! I'm a lot smart now which may not be saying much based on where I started from!

@Lea-ww9hf 5 лет назад

Oh just the video I was looking for! Thank you very much Sr!

@nesarag9546 9 лет назад

thank you so much... it is very much interesting and easy to understand.

@ElectronFunCom 9 лет назад

Great video Martin! I finally know what BMS is all about. Thanks for sharing!

@mjlorton 9 лет назад

ElectronFun.com Thanks. You have a great channel. I hope you find time to do more videos. I have added it to the list of channels on my home page. Cheers, Martin.

@ElectronFunCom 9 лет назад

mjlorton My regular job is quite demanding, but I'm doing what I can to start making more videos. You are one of my favorite RU-vid creators and I would never have expected you might add my tiny channel to your list - thank you so much!

@szentmihalyiautodiagnosztika 6 лет назад

A very helpfull tutorial, now I get it ,thanks Martin

@andrewzanas9387 7 лет назад

Thank you, sir. Great information!

@alloycrow917 5 лет назад

Amazingly explained. Thank you.

@kdknitro 9 лет назад

I work on boats that have inverters in them, that wind up doing exactly what you describe. You get situations where the chargers arent "smart" enough and wind up destroying big battery banks that are tied in series. You get one batter get low on water or get a bad cell and the charger on the inverter only sees nominal voltage and just keeps dumping current into the bank until it over charges the good batteries. Ive always wondered why they dont put this type of technology into these inverters.

@bullguy112 7 лет назад

very good explanation,thanks

@jeevankg1 9 лет назад

Thank you Martin, very useful.

@mjlorton 9 лет назад

K GANESH RAMA RAO My pleasure, thanks for the feedback.

@olliohls1846 4 года назад

Superb explanation! Thank you :)

@paguliukas 8 лет назад

very good explanation thank you

@stevenkmckendallsr1169 4 года назад

Great video. Can you pleas provide a link to the the next / specific video (i.e., specifically referenced, at the end of this video). Thank you.

@sankalpshukla2192 4 года назад

Thanks Sir,,,🙏Can I charge 4 Li ion mobile batteries (also 18650) by Laptop BMS Circuit it also have 5 wire as you shown...🙄🙄🙄

@Praveenrareboyz 8 лет назад

crystal clear explanation

@neddypong 6 лет назад

great tutorial as ever,thank you. Q. I have noticed that on power tools the balancing wires are fed into the power tools trigger via the battery pack , Why would this be when the balancing leads are for charging? Thanks

@Gallardo6669 4 года назад

Wow,outstanding video...!!! Thank you so much 😃

@ForensicCats 6 лет назад

Very nice video, thanks for your time.

@robertcalkjr.8325 9 лет назад

Good job - thanks Martin.

@Red8ify 9 лет назад

Very good video. Thank you!

@enkhtuvshine 4 года назад

Amazing video thanks.

@natezei8230 8 лет назад

Great and so useful ,

@TheSn1per 4 года назад

I know this post is quite old. But perhaps you can help. I have a 5S setup. and the same Balancer your using @15:00 mins. But I cannot find any schematic of how to wire. I lookat at your video many times trying to see how you have the batteries wired up. can you poss show a wiring schematic of the pins on the side of the unit? or or? Thanks - Sam

@donaldhenke2750 5 лет назад

good job explaining., thank you.......

@scepticalbudha2553 3 года назад

Hi. Very educational video. Thanks. Im trying to put together a battery pack for my motorcycle with each cell 2.1 amps. 5 rows in parallel and three cells in series to give 12.6 V fully charged at 10.5A. As Im a newbie, I do not know which BMS I should use and how to connect. your assistance if possible will be highly appreciated.

@jimmatrix7244 4 года назад

Is it possible to replace a laptop's battery protection circuit which is locked by a code or simply use a new circuit?

@charlescho 5 лет назад

Great video. 👍

@MaxGoddur 4 года назад

Off I go to see if you have any more videos on BMS and its make up. It would be great if someone showed a schematic of BMS for DYI.

@BP-sf7br 4 года назад

amazing explanation...

@normnilsson7208 4 года назад

excellent

@ash0787 3 года назад

good video sir

@robviolin1 8 лет назад

Very, very helpful, thanks.

@focusonevideos 4 года назад

excellent explanation. so my new LiFePo4 died after 2 months living outside. coldest temp 14°F. Presume the BMS failed as 12V battery was .2v when i tested it. charged back to 2.0v overnight. Will a new BMS work to bring it back to life ?

@captainsuperfly 9 лет назад

Great video,Thank you for sharing.

@mjlorton 9 лет назад

P. Mathias My pleasure, thanks for posting.

@junesarol1782 4 года назад

Good day. Is the ah of the bms matter? Like for instance i will use a bms board with 35ah but in actual ah of a battery is 38 or 45 or 60 ah.?

@canlelola 6 лет назад

I've been looking at building a small battery bank myself and have ordered a few BMS's off eBay for Cell's between one and six to play around. I have been thinking if using the single BMS's will work in a large battery pack, but I am worried about a the battery's trying to charge one another anyway with that kind of set up.

@arunps1584 6 лет назад

Very helpful, thank you

@keokio7 9 лет назад

excellent information

@linuxxxunil 7 лет назад

I'm not an electronics person by any stretch of the imagination but am intrigued by the subject and have u and Julian subbed. I rarely sit thru a video out of frustration to my lack of retention (what I deem learning) but this was spot on. I wonder if there was bms systems in the old blackberry Phones or chargers? my 9320 curve lasts all day long and yes i realize there aren't many apps running.

@mauritsschoonderwaldt676 7 лет назад

there are. if there werent, it would explode.

@Do_the_Dishes 3 года назад

I have a question I hope someone can answer. I just bought some LifePo4 batteries for my off grid system. 4 - “KiloVault” 3600 Wh each. They have a built in BMS and I want to maximize longevity. I plan on only ever going down to about 25% DOD. So my question is about the top end of charging. Is it ok to only charge them to say 99% state of charge each time? Or do I have to worry about some type of finishing charge like lead acid? Thank you in advance.

@Mananassy 9 лет назад

Very good video, thx . I have a LiMn battery that I bought as new but I ve never used, which was stored during one year. It does noy want to take charge from its charger now. Can you help me to restore it?

@readyhouse 5 лет назад

how can the BMS tell the difference between the voltage of the charger and the voltage of the battery pack? as in the diagram they are connected together?

@jackmenino9654 5 лет назад

Hello, really great video. I just bought a scooter and this scooter has a 52V and 22.4Ah. How will I know if all the individual cells are charging equally. I think the battery comes with BMS . Is there a device I can use externally to check if cells are charging same level. Thank so much.

@yashwanthl1768 4 года назад

Thanks for sharing your knowledge I have questions with respect to cell balancing please help me 1.when this cell balancing will occur is it when charging the battery or when any cell goes more then rated voltage. 2.As in the video in order to enable the cell balancing you took cell to its highest voltage level in real life it may leads to exposion correct me if am wrong 3.can you please explain below scenario if am following passive cell balancing where a resistor is used to discharge the excess voltage of cell I have 3 cell of maximum voltage that it can store is 5v nominal voltage is 3.3v 1st cell is at 1v 2nd cell is at 3.3v 3rd cell is at 2v Here when cell one reach 3.3 v the second cell voltage will 5.6v which may leads to exposion In all the above I have connect the cell in series

@roshanjohnson9482 6 лет назад

I have a doubt. what if one or more sub packs are dead? SInce the bms balances each sub pack by bleeding it to the level of the lowest sub pack will it also kill the rest of the sub packs? Or does it have a mechanism to cut off that particular sub pack from the rest of the battery while charging and balancing?

@emreiris114 5 лет назад

thank you so much. I have a question Suppose that we have 3S3P battery pack and we balance first 3 series cells of first parallel line. Do we have to do it for other 2 parallel line?or is there another way?

@crazyexperiments4815 7 лет назад

I have a 6s bms on a 6s (22,2v) lipo battery but i don't know what the maximum voltage that i can put into the bms. Please help!

@lishapatel5361 7 лет назад

sir can u explain block diagram of the battery management system ... and how i madethis BMS...

@timothywatson9617 5 лет назад

Good job dude

@navneetccna 5 лет назад

can you please explain JST connection and how we can use it ?

@virgilionavarro1009 5 лет назад

I have 5kw solar panels without power bank, I have 10 uxh125-6fr. Can I use these as a power bank.Do you have any idea how to set up the system ?

@GenerationBlackMist 8 лет назад

Thank you for the video

@nozynoz 9 лет назад

Thank you great video.

@emersonsrandomvideos248 4 года назад

I thought the minimum discharge voltage is around 2.5v?

@anandagaming2171 4 года назад

what is the required bms for 14.4v 30ah lipo battery pack ?

@waloooody 4 года назад

Hello martin ... my question is . Can i use 18650 laptop cells with deferent capacities with BMS ? Such, 19650 mah with 2200 mah With 2000 mah .. its 3s pack by the way

@Anhidema 5 лет назад

Thank YOU for this intelligence !

@dickebikefan3050 8 лет назад

Thanks Martin for your explanation about BMS. Your Video is very helpful for me to make an E bike battery. Ik have some knowledge about electricity and now I´m busy to make a battery for my E bike. Can you advice me about a good BMS with the next specifications 36V-11,4Ah (40 cells). I really don´t know which one I have to buy!Greetings from Dick (from Holland)

@marcotulio-analogchannel306 5 лет назад

Hello Martin, where can I find the bms you used in the video? Thanks for share!! Túlio

@oogie-boogie 4 года назад

so in parallel is better? you wont have any probs?

@ivanreynoso3849 5 лет назад

Can a BMS work as an ideal diode for batteries batteries in parallel ?

@mountainman4410 6 лет назад

Amazing explanation. Such a simple to understand breakdown. Thank you for sharing your knowledge with us. I have a question about the equalization charge of lead acid batteries. When lead acid batteries are hook in parallel and series in a large solar system bank, is an equalizing charger able to effectively balance the cells? Or would it be better to isolate each battery and equalize them individually?