Yousun Master, I am most thankful for your instructional video. I connected the balance charger to the same battery configuration as you did. The result is fantastic and unbelievable. I learned from you by watching this video. When I measured the voltage across the 3 large resistors, I didn't get any reading. But when a LED was connected (without current limiting resistor) across, it lit up exactly as in your video. The test was only for a few seconds, as I could not calculate the Current limiting resistor value. Therefore, I request you to let me know, how you calculated the CL resistor and what was the value. Thanks and regards.
Is a simple Voltage Divider, for one side, we have the R to balance battery, in the other side, we have the current for the LED, the most used need 20 mA, so, only need do and simple operation.
I use HX-JH-001 balancer module, and there is indeed voltage across the board's big resistor once the channel is activated for balancing, in my case at 4.22 V. You calculate: supply voltage V(sup) less nominal LED voltage V(LED) equals voltage drop on LED resistor V(r). V(sup) - V(LED) = V(r) 4.22 V - 2.5 V (for yellow LED) = 1.72 V LED resistor R(LED) equals voltage drop V(r) divided by nominal LED current I(LED). V(r) / I(LED) = R(LED) 1.72 V / 0.020 A = 86 Ohm Balancing LEDs are not supposed to work for long time continuously in this case, so you can assume slightly higher current for momentary use, like 0.030 A - this is even still inside safe range. Then you'll get 57 Ohm. Also different LED colors have different ratings. In practice, you can blind choose any resistor between 50-100 Ohm. Should work. Moreover, LED's current adds up to balancing current. If my module is balancing nominally with 66 mA per channel and each LED is taking 30 mA, then I made my board modded to 96 mA per channel! Adding more LEDs + resistors per channel would make even better result. Thank you @Yousun for guidance!
I gotta tell you, you are right. No where have I seen such a clean sharp images , but so sad to say there was no running comentery in English to describe the sequence. But I suppose it wan not necessary for Engineers.
I have an application using ANR26650M1-A cells in a 12s configuration. 3.3V nominal, ~3.50V - 3.55V balance voltage, 3.6V maximum voltage cutoff, ~2.2V - 2.5V minimum cutoff voltage, although less important as I only wish to use the board for charging and balancing. Is there an IC that could work with your boards for this?
Interesting exercise... it raises the question of why the makers of these BMS boards don't use the lower voltage protection ICs, and why they don't put LEDs on their balance resistors, as standard practise.
Does it shut off the current flow when the balancing occurs and current demands is crazy. Power lose on high current low vccis insane vs low current high VCC. Ask the question to why power lines runs low current and high volt.
u know that u should not charge to 4.20 and discgarge to 2.5 or 3v? thats why its protection bms doing leaving 4.15v its good thing its protection should do
Thanks Yousun for your video ! It will help us all ! But did you make a little mistake in the subtitles ? Replace "protection" circuit or "balance" circuit for the 2213? And what is the value of the resistor with your led or the tension between 430 Ohms resistors ? Thank you !
@@yousun2827 Thank you for your answer. Concerning the subtitles, you replace 3 protection ICs with 3 other protection ICs with other characteristics. Then 3 balance IC by 3 balance IC with other characteristics. Is that right? Because in the subtitles, you indicate 3x remove the balance ICs and replace the protection ICs. ;) I understand they're just cue lights. But some people ask what (blue) resistance value you used. To answer them, we can say that it depends on the led used. In this case you used 510 Ohms, right?
@@jackhouse7 It is a simple operation of voltage divider to calculate the resistance of the LED, if you do not know how to do that, you need to learn more or you could hurt yourself, lithium batteries are not toys.
So, this BMS will cut off charge when is fully charged.. And reason to change detectors is to get lower/safer overcharge voltage (point where battery is fully charged) ? Or did your powersupply that? Can I use any ~13V ~2A source for this, like Car's ~12.5V plug? How about low voltage cutoff then.. Did you tested that how down it goes before stop giving power out?
Sorry for my English, I will use the Google translator to do this quickly. The BMS have the peculiarity of protecting against overload, over discharge and over voltage, most of the BMS modules that come out to the market today have a mini load balancer, the bad thing is that they only do their job well when the difference The voltage between cells in series connection is minimal, that is, they have certain limitations due to the current that they can handle when they are small, about 10 or 20 mA, so the balance is made until the end of the load, the bad thing is that if a cell is bad, it is difficult to balance the load correctly. The source must be constant current and constant voltage, that is, a switched source or smps, a linear source will not work for you, because BMS only allow a certain voltage range to perform the charging stage, for example for 3S They are 12.6, but you could add up to 13, the bad thing is that the source tries to load up to that voltage, and therefore, the current will be so great that the balancer will not be able to do much until the moment one of the cells arrives at its maximum, at that moment it will stop charging .... And even if it tries to balance it will not be possible because there is no voltage and the BMS itself must be reconnected and it will not start charging again until the voltage source is disconnected and reconnect ... That is why it is a headache when a cell has been damaged, since for security the system disconnects and until the battery set is balanced again, it will be difficult to recharge the package ... The source only delivers constant current until it reaches its constant voltage, At this time the balancer will gradually adjust the voltage, drawing current through the dedicated load resistor. At this time when the maximum voltage of a cell is reached, the BMS will stop charging because it will reach its maximum load and if it needs to balance more, then it will begin to discharge one by one until they are balanced as precisely as possible, the bad thing is that If at that moment a cell is damaged in a configuration such as 3S2P, it will be difficult to adjust the balance without actually downloading the complete set. Lo siento por mi ingles, usaré el traductor de Google para hacer esto rápido. Las BMS tienen la peculiaridad de proteger contra sobre carga, sobre descarga y sobre voltaje, la mayoría de modulos BMS que salen hoy dia al mercado cuentan con un mini balanceador de carga, lo malo de estos es que solo hacen bien su trabajo cuando la diferencia de voltaje entre celdas en conexión en serie es mínimo, es decir, tienen ciertas limitaciones debido a la corriente que pueden manejar al ser pequeños, de unos 10 o 20 mA, por eso el balance se hace hasta el final de la carga, lo malo es que si una celda esta mal, difícilmente se podra balancear correctamente la carga. La fuente debe ser de corriente constante y voltaje constante, es decir, una fuente conmutada o smps, una fuente lineal no te servira, debido a que las BMS solo permiten un cierto rango de voltaje para realizar la etapa de carga, por ejemplo para 3S son 12.6, pero podrías agregar hasta 13, lo malo es que la fuente tratara de cargar hasta ese voltaje, y por lo mismo, la corriente será tan grande que el balanceador no podra hacer mucho hasta el momento en el que una de las celdas llegue a su tope, en ese momento detendrá la carga.... Y aunque trate de balancear no podra debido a que no hay voltaje ya que la misma BMS debera ser reconectada y no volvera a comenzar la carga hasta que se desconecte la fuente de voltaje y vuelva a reconectarse.... Por eso es que es un dolor de cabeza cuando una celda se a dañado, ya que por seguridad el sistema se desconecta y hasta que no se vuelva a balancear el conjunto de baterias difícilmente volvera a recargarse el paquete... La fuente solo hace la entrega de corriente constante hasta llegar a su voltaje constante, En este momento el balanceador ajustará de a poco el voltaje, derivando corriente a traves de la resistencia de carga dedicada. En este momento cuando se llega casi al máximo voltaje de una celda la BMS detendrá su carga debido a que llegara a su máxima carga y si faltara balancear mas, entonces comenzara a descargar una por una hasta balancearlas lo mas precisamente posible, lo malo es que si en ese momento una celda esta dañada en una configuración como ejemplo 3S2P, difícilmente podra ajustar el balance sin llegar a descargar el conjunto completo.
Master Yousun, if you closely view the BMS board HX-3S-FL25A-A , between B2 and -B terminal, you see TWO terminals, S1 and S2. What are they? Is there any function to those terminals? Is it an ON/OFF connecting takeoff? Please let us know. Thanks in advance.
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
hello, i have a question, can i use the BMS Balanced voltage for the ni-cd battey for the drill charger. I want to replace ni-cd batteries to li-ion battery
You need to know that the original battery of the hand drill is full of the highest voltage. Then match the lithium battery. BMS operating current needs to support the highest current of the hand drill. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ijqjSXpVQV8.html
Yousun, good work! Very cool project. Can you help me locate the appropriate HY2213 and HY2113 IC? My batteries are strange chemistry. 4.10V balance voltage, 4.15V maximum voltage cutoff, 3.0V minimum voltage cutoff. Also, want to be able to balance with a very high current if possible because they are large cells. 4S configuration, 35Ah capacity, capable of 100A discharge. Need a BMS like yours but set to those voltages and if possible higher current capability. Thanks! Mike
Lithium ion batteries of 95 cells are connected in series to make 351 volts. Each cell is 3.7v this pack came with stock ECV. I don't know if this ECV is the same as BMS. but I'm converting it from 351 volt to 48 volts by rearranging the cells this way. 19 in series making 70.3 volts. With the 19 in series I formed 5 stack and then connected them in parallel for my inverter use. So this now configured 70 volts instead of 351 volts it's was before. My question is, will the ECV it ca me with still work as BMS or do I need to in-store new BMS for bottom balancing. I will only be charging this batteries to 64 volts maximum to maximize it life cycles. Please recommend 95 cells BMS FOR me for bottom balancing.
Hi Yousun, what is the value of the resistor you have put in serie with the LEDs showing balance activity ? I want to try the same thing on my end. Thanks !
It is a simple operation of voltage divider to calculate the resistance of the LED, if you do not know how to do that, you need to learn more or you could hurt yourself, lithium batteries are not toys, beware
If the BMS is suppose to monitor high/low voltage, etc, wouldn't it be better to install a smaller BMS for every 3 cells? This would truly protect each individual battery.
Friend, please, help me, i trying to modify a 3s bms to operate with an input voltage up to 14,8v instead of normal 12.6v cut off charge, can you help me to do that? i have exactly the same bms in the video, and i want to do a li ion bat for my little UPS system, but when i use a normal bms, the systems cuts off the battery when the voltage is upper than 12,5 , bacause that kind of 'automotive lead acid' charging systems, works constantly at 14,5 or 14,8. can you help me?!
Hello, I am hoping you could help me with this question. I made 3-24p 18650 battery packs, wired them in series to get 12v @ 60 ahs and added a 100amp BMS. Can I make a pack just like the one I mentions to acquire 120ahs? Thank you for your feed back. Have a nice day.
Yousun , 3 packs of 24 in parallel wired in series=12v@ 60ah(1-3s BMS 100amp) and another, 3 packs of 24 in parallel wired in series=12v@ 60ah(1-3 BMS 100amp) Hooked up together in parallel for 120ah @ 12volts. Is this possible to achieve in your opinion?
I use HX-JH-001 balancer module, and there is indeed voltage across the board's big resistor once the channel is activated for balancing, in my case at 4.22 V. Here is how I calculated the LED resistor's value: First: supply voltage V(sup) less nominal LED voltage V(LED) equals voltage drop on LED resistor V(r). V(sup) - V(LED) = V(r) 4.22 V - 2.5 V (for yellow LED) = 1.72 V Second: LED resistor R(LED) equals voltage drop V(r) divided by nominal (or expected) LED current I(LED). V(r) / I(LED) = R(LED) 1.72 V / 0.020 A = 86 Ohm Balancing LEDs are not supposed to work for long time continuously in this case, so you can assume slightly higher current for momentary use, like 0.030 A - this is even still inside safe range. Then you'll get 57 Ohm. Also different LED colors have different ratings. In practice, you can blind choose any resistor between 50-100 Ohm. Should work. Moreover, LED's current adds up to balancing current. If my module is balancing nominally with 66 mA per channel and each LED is taking 30 mA, then I made my board modded to 96 mA per channel! Adding more LEDs + resistors per channel would make even higher balancing current. Thank you @Yousun for guidance!
Can this also be done on a 1-6 cell 5amp rc charger, I have two chargers one charger to 4.22volt and the other charger to 4,17volt which I would like to have on 4.20volt
Hello, Just have some questions about the schematic of this board : the balancing part is completly independant of the rest of the board or it's "linked" to the over current/over voltage etc part ? Someone found a schematic of this board ? I want to understand the global "interconnection" of all the functions. Thanks.
hi Yousun. i have HX-3S-FL25A-A board. Does it automatically cut off its charging when it’s full? im really afraid plugging in and leaving it long forever...
why my bms 3s positive side 101 chips gets incredibly hot, hot enought to burn fingers if you touch? I have 36 batteries connected as shows in this video. Have tried to connect 4x 3s bms, thinking maby its to high amps for 36 batteries, but still all 4 bms B+ side is frying hot!!! What i did wrong and why is so hot? Dont think it should be that hot. But if this normal, dont realy want to use BMS as i dont think it safe to use them at that temperature! Please need help asap! Thanks
@@yousun2827 so if i take from one of the bms 101 and put it togheter whit another bms, does that work? does it make 202? Im new on this, sorry for stupid questions :D
Master Yousun, please note, Cristian Hurtado requested you to make a complete tutorial to post on RU-vid. You did not respond to his request, to which many people are eagerly waiting for. Thanks.
Hi can i use a 14v 2ah power supply?? This is the closest voltage i have for the bms I also have a 12v power supply but doesnt charge pasta the 12v limit.
Need IC overcharge protection voltage requirements within 4.190, you can use 14V 2A power supply. Otherwise the battery will overcharge. Unfamiliar, not recommended.
I am new to 18650. What is called 3s,4s,6s,8s, like that? is that 4s mean 4 batteries and 8s mean 8 batteries?if so 2 rows of 4 batteries nees what? 4s?
Hi Yousun I made 12v 3s 18650 battery pack and I want to connect it my solar charge controller so can I wire it from 3s bms negative , positive to controllers solar in drectly. Thanks
That's cool so you have to solder 18 pins on 2 IC's to get a decent specification BMS? that's outrageous. I see the original of that charger is rated at 4.25-4.35 overcharge limit!!! the batteries will be tired after 100 cycles. Here is my solution: use a 12.5v charger, balance the cells using very well matched cells adn then never use a 12.6v charger and it's less work than buying 6 IC's and soldering 18 pins!!! It takes good factory cells in groups, about 100 charges to become 5 percent imbalanced, is that right? then after 100 charges you can re balance them usign accucell or a dedicated balancer.
Ich habe ein BMS von Aliexpress und habe das Gefühl dieses BMS hat keine balanzier Funktion, kann das sein? Ich habe eine Zelle als Test entleert und beim Laden hängt diese Zelle jetzt immer hinterher... Woran erkenne ich ob die Balanzier Funktion funktioniert? Wenn ich die Platine anschaue dann seh ich keine großen Transistoren... nur große Widerstände. Ein BMS für 12s müsste ja eigentlich sehr groß sein. Ausserdem läuft die Ladespannung nicht über die Platinr, sondern über 2 Relais. Es ist nur eim Messwndler dabei den man über die Ladeleitung steckt. LG hier das bild www.bilder-upload.eu/bild-65b0d7-1604744772.jpg.html
It is a simple operation of voltage divider to calculate the resistance of the LED, if you do not know how to do that, you need to learn more or you could hurt yourself, lithium batteries are not toys.
Got it. What's the rule behind choosing Balanced & Protection IC ? You have choose only slightly different voltages 0.01V Protection vs Balance, is this enough margin? Some variants of protection ICs have hysteresis between Overcharge Detection & Release Voltage (VCU & VCR), other have the same (VCU=VCR), why? The same is for Balance IC, they can have the same VCU & VCR or a hysteresis . What is 0V Battery Charge Function?
Yousun my current idea is to build several packs and connect them in parallell. 3x5 cells with an BMS. I assume I will need approx 15-18 packs to deliver 200 Ah. Alternatively I build fewer but larger packs. How do I calculate the max A that an pack can deliver?
Battery pack 12V 200Ah , 18650 2500mAh , 200Ah/ 2.5Ah , 3s80p , The battery pack discharge current is expected to be above 80A. BMS selects 3S 200A or more.
Hi, great job! I have made miself a 3s2p Li-ion replacement batery for my cirdless drill. All of the cells were precharged and ballanced at 0.01 v diff. Hooked it up to the drill, when i press the trigger the voltage drops to 0 at the discharging terminals of the bms. The bms is ratted for 60 amps max. Do not think it reached that high. The drill works with former battery pack. Rotor not in sort circuit. Can you please send your opinion on ehat could it be? Edit: jost noticed that if I jerk the trigger really quickly it works. No more voltage cut. But no low speed, only full throtle. :(
The shop where the bms is sold had this to say: "When the load of the brush motor is used, try to connect a non-polar capacitor (withstand voltage above 25V, capacity 10uF-100uF) to the motor's positive and negative terminals to prevent the reverse spike from the motor. Break the MOS tube." I think the capacitor will do the job, but what does he mean by "brake the MOS tube"? And is 100uF enough to rotate the drill?
18650 batteries come in 2 types, high discharge rate and regular rate. Regular rate used in things like laptop battery packs. Need high discharge ones for motor devices - power tools.
@@yousun2827 i wanna build a 24 v pack .. but i dont wann use a bms .. im asking if i can balance my cells by making a conection in parallel of all groops and charge them with 4.2 v .. will this work ?!
what are you doing? much too small wire diameter. the blue and yellow wire is fine but the black and red will never be able to handle 40A. or to put it differently: why are you using those thick metal strips between cells? respect though to your SMD soldering skills using that giant crusted thing!
Buongiorno . vorrei chiedere alcune cose che riguardano i pacchi batterie - posso avere un schema chiaro per fare un pacco batterie da 36 volt 12 ah con 18650 3.6 volt 2000mh Grazie - galideoelide@gmail.com
