Li-ion BMS protection module upgrade mod and hack from 3S to 4S
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- เผยแพร่เมื่อ 19 ต.ค. 2024
- The 30A YH11047A Li-ion Battery Management System Protection Board has two versions. The 3S and the more expensive 4S. They looked identical to me, so I ordered the cheaper one expecting to be able to use it as a 4S.
I couldn't but I did. - แนวปฏิบัติและการใช้ชีวิต
I think 102 on an SMT resistor means 1K, not 100k and it might work a little better if you remove the extra 1K resistor next to the 100k you added. Just compare the two boards again to see what I mean. Well spotted, you've done the hard yards, might order a couple and try the hack myself with the "spare" 1k resistor on the board. Cheers.
Thank you. After this video, i did 4s to 3s
I need do same, could u explane step by step how to do 3S? I have version 4S.
@@mmichniel12 Ok. I will prepare a photoshop image for you.
@@elecdroid3666 i want to use my 13s bms as a 7s can you explain how i can?
Please help, that's exactly the problem I'm battling now
Heya I loved the video man 👍 I have a question regarding my 4s BMS, I just installed one for my 4s 4p battery and I got 16.40 volts out of the BMS which is good but whenever I plug my battery to a load the battery immediately drops to 11.16 volts and but it drops to 4.8 volts when I start using the load with the battery. Can you tell me what's causing this? The BMS and battery cells are brand new.
Thanks for the video, very interesting. I've been testing a few of these 3s 12v bms's and one in particular i purchased turned out to be totally unusable. Do you have a link to the product on Ali-Express?
I checked and it appears I ordered off of Banggood and unfortunately the price has increased..
www.banggood.com/3S-Li-ion-Lithium-Battery-Battery-Protection-Board-10_8V-12_6V-18650-Charger-p-1011517.html
hi, what are the three free pins for? VH VM VL ?? THANK YOU
VL goes between plus of cell1 and minus of cell 2 (~4V)
VM goes between plus of cell 2 and minus of cell 3 (~8V)
VH goes between plus of cell 3 and minus of cell 4 (~12V)
And of course, minus of cell 1 goes to B- (0V) and plus of cell 4 goes to B+ (~16V)
May be a quality control issue. Chip fails on one part so this circuit is used as a 3S.
This is done quite a bit with CPU/GPUs after testing the failed test chips work well enough to be sold as less powerful ones for less. This saves production costs because only one chip is design made
You missed a thing in the schematic: pin 10 (SEL) is connected to VSS in the 3-cell schematic and to VDD in the 4-cell version...
This video helped me solve my problem with the 3S board... I connected VL to the first cells plus, VM to the second and VH to the third. It turns out VL should not be used for the 3S version. internally on the board pin 15 is connected to the third cell. so you just need to connect VM to the first and VH to the second...
Seller on aliexpress had NO IDEA. Told me I should look it up on google...
You missed something. Right next to the 102 resistor you added there is a resistor with the same value that does not exist on the 4S variant. All you had to do is take the 102 resistor from that pad and move it to the left.
Indeed, I just found this out. It's connected to pin 11 (control) which switches between 3S (connected to pin 7 VSS) and 4S (connected to pin 16 VDD) mode.
I just opened up the seller page and looked at the both images, the 102 resistor needs to be moved next to the 472 and voila.
20s lifeo4 bms can be used as 4s bms in 12 volt?? If left other pins as unused...??? Wanna know about it?? Will it work?
Dear friend!
Please help me! I saw your video about the YH11047A BMS modules. Here you are talking about 3s30A and 4s30a bms. Since I don't understand your language, I don't know what the solution is! For me, only this red, small-sized panel fits in the Bosch drill! I would need 3s30a bms.! I already ordered 3 pieces from China from different dealers, but in each case they sent the 4s30a version!!!! These do not work with 3 18650 batteries! In the video, you talk about converting a 4s30s bms module to a 3s30a,.re? Can this conversion be done at home? In this, I am asking for your help as to where and at what value smd components should be implanted!!! I looked at the marameters of the S-8254A chip, and it shows the wiring difference on page 19, but I'm a mechanical engineer, but I have an electrical engineer friend who, if I get your help, maybe we can get it done!! So the question is, what needs to be removed and which part needs to be implanted at which point.
Best regards: István
You should add a note in your description that you're not using the device correctly, which is why you're not seeing the voltages you expect.
Hi Tom! thanks for your helpful video! Have you had a look at the automatic/non automatic mode option by soldering a 0R resistor? could you please help us understand the utility?
No - I haven't looked at that.
Respected,
The problem is the following. When the machine is pressed by the switch quickly, it just moves and stops, and when it is pressed slowly gradually, it accelerates slowly and works. Is it possible to solve this problem? If they are not in the cell itself because they are not electric current 3.7V 2.2A?
Thanks in advance!
Tom,
U did th mod in th board thts good., bt I even we wld appropriate more if u can program these board's chips by modding overdischarge voltage frm 2.3 to 3volt per cell.
lithium cell shld not be discharged less than 3 volt , so why these BMS cuts off @2.3 hurting th batteries , I don't knw.
Could u do tht mod pls?
hey nice video :) sry.. my english is not the best...so i didnt understand everything but i just bought a circuit board like this and i cant figure out how much voltage i have to put in the circuit board ? i bought a 2s 3s and 4s board, do i have to put the voltage in exactly like the output for the li-ions ???
Hi... this is a protection-only module. It will cut a connected load if the voltages on any cell are outside of the safe range..
Something was bugging me and I just used the 102 resistor, but you keep saying 100K which is 100,000KΩ when the 2 means you add 2 zeros to 10Ω so 102 = 1000Ω or 1kΩ. You can use anything above the rated like you have, but less and less current will be applied
It's not a balanced charger. Only protection.
The 2S = 4.2v times 2=8.4v, 3S = 4.2 times 3=12.6v and 4S = 4.2 times 4=16.8v and shuts down power to save the batteries from dying... You still need to balance each cell to 4.2v so they don't die and discharging using another method.
Respected,
I have a problem with such a tile. when the bushel starts, it suddenly reluctantly and when it starts slowly, then it works. What can it be
issue ?
Can we use a 4s bms in a 3s battery pack?????
99% will not work.
just move the 102 resistor over to the spot to the left and it will fully activate, Cheers!!!
do you have 1s bms same model like that how to use it?
No you're totally wrong! You're mistaken about how this works :-) The four fets are in parallel pairs for lower RdsOn, a pair for charge and a pair for discharge) as per the schematic in the datasheet. The three battery pins aren't outputs! They're *inputs* for cell monitoring. You won't get any *output* on them..
Ok look the way it works is that it's a safety chip that monitors each cell but it doesn't _charge_ them; it has two pairs of Pfets (they only show one in the datasheet schematic but putting two in parallel lowers the on resistance so increases the current capacity; but there's effectively two large fets on there; they're kinda "back to back" so one is for carrying the charge current and one the discharge current (they may have wired 3:1 instead of 2:2 if the discharge current is > charge current but you get the idea). The chip itself only monitors each cell it doesn't even try to drive those pins, for the purpose of killing the power (turning off the fets) if you try to overcharge or overdischarge. That's it. There is no charging function in there- you're supposed to use an external balancing charger (which also has a connection to each cell for monitoring and _also_ balancing by slowly draining any that are too high). Almost all the charge/dischage current goes through the main connector/fets of course. Putting a voltage on it and measuring the sense pins (as you are) is meaningless because they're not driven.
+Dr Tune you are correct.
hi, nice video. whats the charging voltage and amp for 3s and 4s
It's protection only. You'll need a balanced charge module. In fact, most balanced charge modules do not operate as balanced chargers, more like "balanced dis-chargers". Bit of deceit within the li-ion charging industry.
Hello teacher, I have a 4s bms card. but I have 2 batteries. Can I use 4s card as 2s? I can do that nawil.
No.
so,102 is 100K...nice!
Is there a way to modify it to use lead acid battery ?
Can a 10S BMS for 36Volts be used as a 5S BMS for 21 volts
Hello, sorry for my English, im from Spain.
I tried to convert the 3S YH11047A plate into the 4S plate. By removing the resistance of 0 Ω going on the leg 12 of the chip and moving the resistance of 102 Ω to leg 10 of the chip, I think that is as you say in the video (the numbers of the legs according to the YH11047A datasheet).
In the P + and P- outputs I obtained a value of about 9V and not 14v as in outputs B + and B-, so it does NOT work properly for 4s.
It is difficult to solder the SMD resistors with an electric soldering iron, nose if the problem is there or is that you have to change something more of the plate to convert it.
In the datasheet they speak of SEL pin, I do not understand very well if it is the signal that receives or something else has to be changed.
Please, is possible to use 4s bms for 3s battery
A question please
hi Tom have you tested this to make sure it does balance charge ? cheers Brett
Brett, yes .. lots of testing on dozens of BMS modules some with balancing implemented and most without. This one does not balance the charge. It's over-charge and over-discharge protection only.
Oh ok thanks, Im having trouble finding a cheaper 3S Balance Charger Module......do you have any ideas/links ? cheers Brett
Haven't tested this one, but at $8 it's worth a shot. www.aliexpress.com/item/3S-packs-11-1V-12V-20A-Lithium-Battery-Protection-BMS-Board-WITH-Balanced-Charging/32707938997.html
Hello, nice tip! What a camera you use?
Sined WOLF I used Panasonic LX100 and Panasonic FZ1000. Both are UHD 4K. This was shot on the 1000.
Hi, i have 4s protection board from AliExpress and now when i charged it, it goes up to 16v and when i plug it to the load the voltage drop to 9v, what is the problem?
Does the BMS cut the load at 9V? (most BMS protection modules disconnect the -ve terminal) If not, then either the connections from the module to the cells are faulty or the module is faulty.
Tom Donnelly I charge and connect BMS to my amp at the same time, after i unplug charger BMS is faulty and death
I think he is same situation as mine
You shouldn't be trying to charge cells through a protection-only board.
If i put a bms on my battery pack ,do i still need to put a balance cable on it as well to connect to my balance charger ? ?
+Fook Utube Yes.
Saying that.do i connect the balance to the bms or do i just connect it on the battery like normal
?..Thanks for the reply!
I have an 13s bms, can i use it as a 7s?please someone reply
It is indeed a 1k resistor not 100k, I have a 4S board to play with here.
cna we use this to charge as well as discharge the batteries?
+hasan junaid No.
+hasan junaid No.
Commun port....
Sorry sir, I patiently waited for almost 10' but in the end I have no f*cking clue what the h*ll you did to supposedly enable 4S on a 3S board. Any chance you can spell it out for those of us not so well versed to your otherwise magnificent British accent? Thank you!