This project made me rethink my setup with an Adafruit solar charger. For my timemachine project to run longer using an Arduino Pro at 3.3v. I placed two Lipo Batteries in Parallel to have the same output of 3.7v with a larger running time or capacity when the sun was gone. I noticed the second battery drained more than the second battery once I place them in a commercial charger. Seeing your animations and showing single and multiple charging methods I now feel better about learning what are my mistakes. Thank You for sharing and keeping up on all the great content. Not everything is applicable but as makers we must learn from each other to share our project. Awesome overview and great tips. You are always setting the bar higher and higher for all makers.
@jackwilliams2010
3 жыл бұрын
I've watched a few bms videos before this. I have to compliment on how well you explain how this works and how to build your own. You are very underrated and deserve more recognition. 5 stars!
@ELECTRONOOBS
3 жыл бұрын
Thank you very much!
@Undermada
Жыл бұрын
Probably one of the best videos I've ever saw with explanation of BMS! Thank you!
@JohanDegraeveAanscharius
2 жыл бұрын
I read A LOT of explanations about BMS and to really understand it well, this is really the best. I let it rest overnight, asked myself questions, and looked at it again. Really, very very very best explanation out here!!
@len8752
7 ай бұрын
Great Video! I've been subscribed for the longest of time, but every now and then, you just publish more and more explanatory and informational videos that go briefly into the problems were are trying to solve step by step, stage by stage. Thank you so much! 6/5 Starts
@DrJALAGHARI
3 жыл бұрын
What an easiest way to explain the difficult concepts. Amazing.
@Eduardo_Espinoza
2 жыл бұрын
True, this is honestly why i stopped electric builds years ago
@ELECTRONOOBS
3 жыл бұрын
Arduino Course LEVEL 2 (Spanish): bit.ly/2ZNWgqy Follow me on FACEBOOK for more: facebook.com/Electronoobs Help me on Patreon: www.patreon.com/ELECTRONOOBS
@ShivamKumar-rp8kr
3 жыл бұрын
I understood it well. Thanks for the simple explanation and animations. Loved it. ❤️
@Clark-Mills
3 жыл бұрын
Error: The output of R2, R1, R10 voltage divider at 5:00 is supposed to feed into the Ref pin of the TL431 with Anode to negative and cathode to the BD140. If you just swap the AN/REF labelled pins on the schematic you should be right.
@mahargha_debnath
2 жыл бұрын
bro have you tested your circuit please tell me it'll be a great help
@suzznshkya1098
2 жыл бұрын
So the reference pin of tl431 must be between R1 and R2 resistor?
@Induwara-Perera
Жыл бұрын
Yeah bro, I also saw there is a mistake, after i fix that issue it almost works fine, but i recommend others to use 22k and 1k resistors for that voltage divider connected to tl 431 ref pin cause the ref input voltage is higher when you use two of 20k resistors.
@alexvanstaden6734
Жыл бұрын
I also found that out after struggling setting the TL431. Good observation
@waltercortescarvajal7254
Жыл бұрын
Hi, would you be so kind as to share the corrected plan, with the values of each component, thanks
@stevenA44
3 жыл бұрын
I've watched quit a few of your videos and I just decided to subscribe. I've seen a lot of the things you make that might come in handy in the future.
@power-max
3 жыл бұрын
Nice build! I am looking to build a BMS for a huge build with 1000 or more 18650s I have on hand. This circuit does have quite a few important limitations though: No under voltage protection No over temperature protection No over current protection. The DIY project could be massively improved with the use of a low power microcontroller for each cell monitoring the voltage and using galvanically isolated (optocouplers) in a token ring or CAN network to transmit data back to a more powerful MCU that manages the series string. Active balancing is harder for sure. I have one idea involving using lots of gate drive transformers and implementing small basic forward converters for each cell to dump energy into a shared AC square wave bus, but have yet to get it to work right in LTspice.
@vtorsi610
3 жыл бұрын
This is the CHARGING "half" of a BMS. This does not have the LOAD "half" of a BMS ( load over-current & under-voltage ). He made that very clear at the beginning of the video.
@Brian_Of_Melbourne
3 жыл бұрын
Look at Adam Welch's channel kzitem.infovideos and search for 'diyBMS'.
@gkdresden
2 ай бұрын
A very nice BMS circuit for smaller LiPo, Li-Ion oder LiFePO batteries. The advantage of the circuit is, that you can easily cascade the circuit for your desired s-number and you can charge it with a power supply which delivers enough current and a few volts more than required. The disadvantage is the power loss, but for smaller Cells it is quite useful.
@artursmihelsons415
3 жыл бұрын
Mmm.. LM317 old school, that always works and is tested for decades.. 👍 431 references is used even in cheap BMS modules for batteries and ultracap's from China.. Great video!
@maungmaungtint8572
2 жыл бұрын
I had to build this circuit. Good working . Thanks a lot for your sharing of experience.
@jstro-hobbytech
2 жыл бұрын
What an awesome circuit and I actually have all the components except the battery box but I could just print one
@VrumsAdventures
3 жыл бұрын
I am sorry if this was mentioned before but the datasheet for LM317 has an application specifically for battery charger. You can put the current limiting resistor at the output before the voltage divider that sets the output voltage... and since the current limiter will be pretty much >2 orders of magnitude less than the resistors in the divider, it shouldn't affect the output voltage. You save 1 LM317 this way :)
@vtorsi610
3 жыл бұрын
Great Idea ! Or use a Buck Converter with adjustable voltage and current regulation built-in
@SocialPerspective101
Жыл бұрын
Can you elaborate on this?
@VrumsAdventures
Жыл бұрын
@@SocialPerspective101 on what? I don't think links are accepted in YT comments (unless they're made to your own video) ... but I can try if you tell me which part you want me to elaborate on.
@SocialPerspective101
Жыл бұрын
@@VrumsAdventures current limiter will be > 2 orders magnitude... I did not get this part
@VrumsAdventures
Жыл бұрын
@@SocialPerspective101 I believe it's easier to try and link you to the application. The LM317 datasheet has at chapter 9.3.6 the battery charger application I am talking about. There's the voltage divider that sets the CV part and the series current limiting resistor (Rs) that will set the max value for the charging current to your CC desired value. The CC part will not really be CC, but the current being drawn will not drop significantly during this time (it will drop with (Vbat - 1.25)/R1 and Vbat increases as the battery is charged). The CV part will stop the battery voltage from rising above the desired (usually 4.2V) value. Rs is more than 2 orders of magnitude (or 100 times) less than R1 or R2... and as such it will not significantly decrease the desired output voltage set by the divider (R1 and R2). If it's close to R1 and R2 than you're either limiting the current a lot or wasting it through the voltage divider... or both and you're setting yourself up for a hard calculation and less than optimal result. I hope this is more clear :)
@officializm4171
3 жыл бұрын
Very informative content. Dispelled many confusions. Thanks.
@valteroscarjentsch
Жыл бұрын
Faz tempo que estava procurando um circuito como esse. Muito bom. Interessantes explicações. Congratulações!
@mehdikhan
3 жыл бұрын
Nice for understanding the concept of charging but there are very low-cost chips to the same thing with much more effencency.
@akhilsubhash7644
3 жыл бұрын
right
@orwellophile
Жыл бұрын
But they all charge to 4.2v, which is sub-optimal for battery life. This circuit is great for battery packs you don’t use much, and would otherwise just zero out eventually
@ohmslaw6856
3 жыл бұрын
I have constructed this circuit and i have found just a few issues, but the circuit does work pretty good. My battery was 280mAh battery, datasheet called for a standard of 58mA charge, or max charge of 280mA.. i chose 58mA.. estimated charge time ~ (280/58mA) = 4.8 hours Because I have a power supply i figured I would skip the lm317 voltage regulation and simply use only one lm317 for CC and just use 4.2V from power supply for the input.. the issue with the lm317 in current mode is you can't use 4.2V input supply because the output will not provide CC at the given 4.2V output.. it states on datasheet of headroom around 3V or soo.. So i decided to use both lm317 for voltage and current.. like the circuit diagram shows but only CC comes first then Voltage regulation.. IMPORTANT you must have power supply 3 volts above battery level.. so for a 4.2V lipo i put a supply of 7.5V into the CC lm317 input and connected the output into the input of a lm317 in voltage mode.. with an output of 4.2V.. only needed 60mA.. P=(7.5-4.2V)(60mA)=200mW.. lm317 isn't even hot I could have used only one lm317 in both constant voltage and current.. but would have been bigger headache in calculations because of output impedance Also Iref into the tl431 is too low.. around 8mA is recommended.. for the voltage divider i used resistor values of 212.2 ohms for R1 and 313.5 ohms for R2.. this will provide more stable reference of exactly 4.2V I monitored my batteries voltage and current throughout the whole charging process.. the current started at my selected max current limit of 60 mA.. the battery voltage slowly rised.. once i hit around 4.19V the current slowly slowed down to 0 amps.. then the transistor opened and the battery stopped charging.. so the circuit does provide CC charging and CV charging.. the closer the battery gets charged to the supply voltage then obviously a trickle charge to 0 amps will occur.. Overall was a great learning circuit.. learned alot about tl431 and also lm317...
@Eduardo_Espinoza
2 жыл бұрын
idk, I'm gonna take another 5 year break of electronics
@SocialPerspective101
Жыл бұрын
How about the scenario where max input voltage is limited to 14.7 volts?
@sebastianelcaio8040
3 жыл бұрын
Amigo, que buen proyecto!!!! muchas gracias!!!! saludos desde Argentina GENIO
@schetenwapper6591
2 жыл бұрын
Why use diodes as a load instead of just a high power resistor?
@thalavalikaran262
6 ай бұрын
May I know how can we replace the loads from the diode to the motor in this circuit, can just replace all diodes with single 12V motor for 3s bms?
@ricardosanchez1638
3 жыл бұрын
Excellent! Bravo bravo, great presentation!!
@AndriiBilous
Жыл бұрын
Nice project! The point you dont need to use 2 LM317 to limit U and I. I faced to this case as well. There is a scheme that allows to do this with one LM317. The scheme is mentioned as Load Regulation in the datasheet. Anв as usuall you need to use addшtional transistor for hight current.
@reptiloidx8942
Жыл бұрын
Hey man . I got 60v li-ion battery pack for my powerful electric scooter and i got charger that seems to be overcharging the battery pack to 64v plus and it doesnet stop . Wheni asked the seller he said i can charge it all the way to 72v 😐which i think its hazard high alert 😬so tell me what is the maximum recharge voltage please ? Thank you
@radosawwalczak9630
3 жыл бұрын
Hi, good stuff. But you make one mistake in your schematics. Current limit must go first, after that voltage regulation. If voltage regulation have to give 4.2V, then you need to add another 2V for LM317, then you need to add another 1.25V + 2V, which means power supply must be at least 4.2 + 5.25 = 9.45V or more.
@SocialPerspective101
Жыл бұрын
Can you please explain why the additional voltage is required?
@alexandrprodanFOTO
Жыл бұрын
all voltage regulators have a voltage drop ( eg. 0.7 V for SI semiconductor jonction ), for LM317 is safe to use Vin-Vout at least 3V so no way to use 5V for one lithium cell that requires 4.2V.
@alexandrprodanFOTO
Жыл бұрын
I ment Linear Voltage Regulator as LM317 is.
@nalinux
Жыл бұрын
Pay attention, there are several quite similar 431. The TL 431 pinout is Ref Anode Cathode, while the LM431 is Cathode Anode Ref or Cathode Ref Anode It's a mess ...
@ronostrenski8359
2 жыл бұрын
Thanks. Built a 5S version and works well.
@mickeyfilmer5551
3 жыл бұрын
excellent ! concise ,informative and articulate !
@iamdestructoman
3 жыл бұрын
Hate to leave a negative comment. but lithium cells require cc/cv and only when the current drops off, is the cell fully charged. it is NOT fully charged upon reaching 4.2v, that is when the CV comes in and the current starts to drop. The battery is still charging at this point and is not complete until the current draw is near zero. This is not a proper charging or balancing circuit and although i do not see it being dangerous or causing failure of any cells, it is not the proper method of charging cells and i wouldnt recommend anyone building this "internet found schematic". just buy a charger, or get a dedicated chip that does all of this in a single package with discharge current limits and low voltage cutoff too.
@vtorsi610
3 жыл бұрын
Some people do not need, nor want, 100% SOC - as that reduces battery life ...
@seabreezecoffeeroasters7994
3 жыл бұрын
@@vtorsi610 Bullshit! Long term storage at full charge is shown to reduce life and capacity charging to 100% DOES NOT. Again do some reading you have NFI.
@backdemoletor4654
3 жыл бұрын
Finally another great video to watch
@freshersofbose456
Жыл бұрын
commercial bms also has over discharge protection and balance discharge features.
@shivamvaid601
3 жыл бұрын
It's good. Not highly efficient but works in a jiffy.
@user-ih3kk8lh1v
2 жыл бұрын
Nice video! What benefit is there to using this circuit over just putting the diodes in parallel with the battery?
@hoofheartedicemelted296
2 жыл бұрын
This is awesome sir. Is it possible to build such a circuit with 12v batteries in mind and how would the components change accordingly? Thank you.
@sohamgaud7120
3 жыл бұрын
Hi sir very good video and explanation I understood whole video except 1 part and that is why you have connected 5 resistors of 10 ohms in series ?? [PLZ REPLAY 🙏 ]
@rolandoreytorfonseca3112
2 жыл бұрын
Excelente proyecto! Muchas gracias desde Cuba
@user-kf7yc2fo2k
4 ай бұрын
Good Day is there any problem with the circuit? Can i ask since we are having trouble adjusting the potentiometer. Is there any corrected schematic and instruction on how to adjust the potentiomer? Do i need to adjust the potmeter without connecting the lm317?
@MrKedrik
Ай бұрын
Hi thank you it was very clear and very nicely explanatory. However I have still have a question. Is this homemade BMS protects cells from short circuit ? As far as I understand, we saw only the "charging" side of the BMS, nothing related to the "discharge", when the battery is connected to the load. Am I wrong ? If so, it would be nice to have some info about that topic as well. Thank you so much.
@sohamgaud7120
3 жыл бұрын
Sir i want to sometimes use it for 2s battery charge and sometimes for 3s battery charge so can I use the same circuit for 2s and 3s battery charge ?? PLEASE REPLY SIR 🙏🙏🙏🙏😇
@vtorsi610
3 жыл бұрын
Yes, I believe that a 3S Charger will work with only two (2) Cells installed, with the third bay empty.
@creativecityis
3 жыл бұрын
All bms regulate cells to 4.2v… with this setup I could charge to 80% and double the life cycle
@keeptrying7640
2 жыл бұрын
I'm not a electric engineer in getting the bill done do you have a site where I can try it out
@keeptrying7640
2 жыл бұрын
And also can I change the value to a lower voltage
@jehirulislam3047
2 жыл бұрын
My battery is 3.7 v .is it workable
@youseff500
Жыл бұрын
@@jehirulislam3047 yes. That's its nominal voltage. He explained in the video that the output voltage will drop to 3.7v. All lipo cells are 3.7v.
@ddmaster6994
Жыл бұрын
Diagram?
@МобилиславОткосилантий
Жыл бұрын
Высококачественные видео, у этого гениального парня! и почему то , так мало лайков? Ау люди проснитесь, ваш лайк - это уважение автору видео , за его труд.
@captivator13
3 жыл бұрын
Awesome content, Thanks bro :) Sam 🎵✌🏻
@036_ridhoakbarilahzaim6
6 ай бұрын
Instead of using LM317, why don't we use a buck or boost converter to stabilize the voltage?
@BorisSiber
Жыл бұрын
Thank you. May the force be with you :)
@riccardoprivitera1984
3 жыл бұрын
How can you put in parallel to the battery a 4.2 V voltage regulator if the transistor closes at 4.2V?
@Noxoreos
3 жыл бұрын
The nominal voltage of most lithium cells is actually 3.7V and not 3.8V. The latter is called "HV". The higher ones go up to 4.35V and not 4.2V. But there are also some older cells that are only 3.6V nominal and they end at 4.1V. So be careful and check the writing on the actual cell. If there is no nominal voltage written on it, then check the part number or don't charge higher than 4.1V if in doubt. Better safe than sorry with lithium batteries.
@raphaelcoti692
2 жыл бұрын
Cool video but with this circuit you can only charge your batteries not discharge them in a load after they are fully charged, its more a li-ion charger than a real BMS with which you can also control the maximum output current and undervoltage ... but still this video is great, keep going man
@SocialPerspective101
Жыл бұрын
Yes disconnect feature if any cell goes below threshold is missing.
@WagonLoads
2 жыл бұрын
I have a question/suggestion for a video idea... I saw a video from someone showing how to use a 2.7volt 500F super capacitor for a spot welder for LiPo batteries.. But they never explained how to properly charge the cap without going over it's rated voltage. Can you do a video showing how to make it the right way?? A proper Super Cap charging circuit... to be used as a spot welder. Thanks!
@sohamgaud7120
3 жыл бұрын
SIR can it work with 9 volt as input power ❓❓❓❓ PLS REPLY🙏🙏🙏🙏
@vtorsi610
3 жыл бұрын
Each LM317 requires an additional 3 volts, above the (1S, 2S, 3S) Battery Pack voltage.
@sohamgaud7120
3 жыл бұрын
@@vtorsi610 Then will it work ?? with 9volt 🙏🙏
@vtorsi610
3 жыл бұрын
@@sohamgaud7120 Can you compute this formula? Minimum Input Voltage = 3v + 3v + ( #cells x 4.2 volts )
@bartholomewkottey7230
Жыл бұрын
Good teacher! Please I need the full picture and diagram for two or more cells. The explanation is perfect! Thanks God bless you
@mr.butterworthz6148
10 ай бұрын
This is an example of a passive balancer right? cheap, but power wasteful? good video btw!
@JohnDoe-xv1se
Жыл бұрын
Really enjoyed the explanation. Thanks. Love to see a more efficient example (for minimal heat dissipation). BTW: has anyone seen a protection, balancing and charging solution for four 3.7V 500mAh LiPo batteries in "parallel" and in circuit? Protection, balancing and charging, without removing the batteries. Every battery management IC manufacturer offers 1S and multiple series solutions, in circuit and out, but I can't find one offering an "in parallel in circuit" solution. What gives?
@jitencaleb7075
Жыл бұрын
Good job... But suppose I want to have the solar panel supply an the input voltage from 12 to 18v and want a 12 volts output
@Dark_Phoinix
Жыл бұрын
now need one with thermo control! gj!
@짱짱맨-r6e
2 ай бұрын
How can i know the accurate resistivity value for limiting charging voltage? Because i wanna use static value resist instead of potentiometer. And thanks for helpful video
@aymanmostafa7230
Жыл бұрын
Thank you. I have benefited from your explanation, but I have a question: why 4 diodes and not one?
@kwpctek9190
3 жыл бұрын
LM317 has minimum 'dropout' of 2 to 3v, so drop voltages in schematic 9:37 are wrong. BTW first LM317 is not needed and don't ask a LM317 to dissipate > 1.5w on no heat sink it will short and set your batteries on fire at 16v!
@kwpctek9190
3 жыл бұрын
Also max PD on LM317, 338 etc.. (in TO-220 package) is about 15 to 20w total even on a huge heat sink.
@venom_ftw9316
6 ай бұрын
Thank you so much for this. What about for Parallel cells?
@rinokentie8653
3 жыл бұрын
Very interesting again!
@prashantrai5102
2 жыл бұрын
THANKS THANKS THANKS A LOT FOR THE WONDERFUL EXPLAINATION
@dharmakissoon
3 жыл бұрын
hey great vid mad props. can this that lead battery charger?
@asaizanm
Жыл бұрын
for lm 317.. just make sure you have at least 3v headroom for vin - vout, or less you will not be able to delivered the current , even only for charging a single battery..btw the circuit works well.. tq
@furkangoren5339
Жыл бұрын
where is the balancing and discharging circuit?, i dont get that point. Do we need add extra passive balancing circuit to this circuit?
@Mega-24
2 жыл бұрын
Hola buenas, muy buena idea y video, quisiera saber si puedo utilizar el LM336 en lugar del TL431 y que modificación tendría que hacer?Desde ya muchas gracias!
@josedasilva4904
Жыл бұрын
Excellent BMS explanation, congrats!. I only have NPN transistors, how will the circuit be? Thanks a lot.
@fiandaja2594
3 жыл бұрын
Thank you for the circuit explanation
@emrethesea
3 жыл бұрын
This is not a BMS, just the charger, with my respects to you electronoobs...
@Seu_Lunga
3 жыл бұрын
Maybe you could improve by using an opamp to compare total output voltage to input and cut the charge
@vobinhthu5299
7 ай бұрын
This project is very good!
@greatrespect1549
Жыл бұрын
Your intro is great.
@sureyyaak5215
4 ай бұрын
Thank you for your video. But in my knowledge and opinion you can not write load/charge to the pinouts in the circuit. In original circuit that I have seen many years ago there was no current and over voltage feeding sections. I mean Two LM317 circuits. In original circuit, power for charging directly connected to the batteries and of course during powering of load, load is also connected to the batteries outputs. In my opinion Your circuit is okey for only during charging. It makes overcharging and current adjustment. But If you connect load to the ports in the circuit you can not get 3 x 4,2 volt. Because according to the circuit two LM 317 in and out pins are not correct for load cycle. For powering of load you should make one extra + outputs. I wanted to explain. Best regards.
@robinqvarfordt9671
4 күн бұрын
But there will be a voltage drop over the current limiter of 1.25V, no? Thus the input has to be at least 4.2 + 1.25 = 5.45V..
@unglaubichuberlieber8048
2 жыл бұрын
thanks, one question, would this work if one mix cells with different ah ???, and please stay healthy !!! and continue with your work in lithium battery cells !!!
@IgorSantarek
Жыл бұрын
This is great explanation!
@inventorkr1
3 жыл бұрын
Great video my friend👉❤️
@mahmoudtayel229
3 жыл бұрын
The best one ❤️😃
@judahosuigwe
Жыл бұрын
Thanks so much for this video Sir. Please I am working with a 5s battery setup, what are the changes I will have to make for an efficient charging.
@keeptrying7640
2 жыл бұрын
I bought a Daly BMS a long time ago and I can't say I'm happy with it cause it makes one battery go over voltage I got lifepo4 will your BMS work for me . I'm using the batteries for a solar system on my house
@olaleyejoshua949
Жыл бұрын
Good 1. Thanks for sharing the knowledge.
@jstro-hobbytech
2 жыл бұрын
I know that keysight dmm is over a decade old but it's timeless. I love it. It must be 4.5 digit is it?
@kumar-np8dm
3 жыл бұрын
Can we measure air core inductor(lower value for rf projects) by a cheap 15$ lcr meter(4070lcr meter)? Please answer me.
@БидонКадыкавич-х2ц
Жыл бұрын
Very understandable. Bit what aboit parallel battery configuration?
@ScienceLab760
3 жыл бұрын
Hi good video I always enjoy your content and learn about electronics, thanks for share
@EpinceKopiO
6 ай бұрын
The CC doesn’t work very well as the headroom space for maximum current for LM317 is too large, the battery must be in 2.7V just for it to be in CC mode, which is too low for any lithium ion battery. Am I doing something wrong or is the designed flawed ? Calculation - Vout plus 1.25V ref + 3V headroom for the mode to be in CC
@Regimantas_Baublys
3 жыл бұрын
Did you circut got 1/10 cuttoff lithium ion must be cuttof you cant float charge them lik pb batterys
@OwerChildhood
3 жыл бұрын
It's really good. If i want charge 5 cell. What i change in this circuit
@John_Smile
2 жыл бұрын
Thanks so much for the idea. Have we seen how the upper threshold is limited (4.2 V), but haven't we seen how the lower threshold is limited (3.2 V) ?
@John_Smile
2 жыл бұрын
Do you know a place where you can buy parts for a BMS ? I would buy too!
@leo959
Жыл бұрын
Can you do a video with lifepo4 battery packs in 2s?
@BeetleJuice1980
Жыл бұрын
If we use a 5s bms we need a constant current source? Bms has protections but it's not a charger so I guess we must use a constant current power supply to every bms?
@mrDarksand
2 жыл бұрын
Very interesting, does this mean that if i want my cells to stop charging at 3,9 or 4v, that i can just adjust the potentiometers?
@Iamsuccesspro
2 жыл бұрын
Yes
@JamesFraley
2 жыл бұрын
Great tutorial. Thank you
@blmb4274
3 жыл бұрын
Nice Video. So can I suggest a video that you can make. Can you make a DIY Ossliscope. Or how to measure waves at least with an Arduino. Thanks!!!!
@superflystar8621
2 жыл бұрын
Sir, we thank you very much for this beautiful and very detailed explanation. Can this board organize the balanced charging of three poles of lithium batteries of 150 amps or more? And if not, what will be the shape of the diagram that I can make with her board, please explain and help.
@feliperoque18
Жыл бұрын
Nice explanation, but i was wonder how its possible in my case i make a 3s2p bms circuit? i'm having a lot of doubts about this topic, one of them is how i will make this kind of circuit and why only bms are sells with 3s, 4s, 5s options instead of 3s2p, 4s2p and soo on...
@kennung1001
Жыл бұрын
Great explanation, but undervoltage protection is missing.
@PintaoLoko
Жыл бұрын
I have a question.i have some lipo here that no matter how long they charge they never reach 4.20/4.25 volts. I was wondering how to make a circuit to show the battery is not charging properly. Maybe use some circuitry based on time lapse. Do you have a. Idea? Just one more question: how to add a temperature control based?
@purvr4626
3 жыл бұрын
this looks interesting, can we replace the BJT with P-ch mosfet? also is the ref pin supposed to connect to negative of batt or its just a error on the diagram?
@lio1234234
3 жыл бұрын
Please design a protection circuit similar to this that instead shows an led for low voltage and powers the device off as the cells reach a critically low voltage
@Ilektroniobatteries
2 жыл бұрын
Lithium batteries charge at constant voltage constant current. When battery reaches the 4.2volts, it continues to charge by reducing current flow and storing capacity. The switch off indicator-circuit must be triggered when current is off, and not when a voltage of 4.2v is reached. A battery can stay at 4.2v and keep changing for sime time(depending on its capacity) until current is not flowing. When 4.2v is reached and no current is flowing then battery is Fully charged. In any other case all you get is an undercharged battery with a voltage of 4.2v and no capacity.
@SocialPerspective101
Жыл бұрын
Does LFP batteries behave the same way too?
@Ilektroniobatteries
Жыл бұрын
@@SocialPerspective101 All batteries behave the same way. When no current can flow, the battery is fully charged.
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