Battery Management System (BMS) for a Lithium Ion Battery (with HX-2S-01)

[@grantpeers8575]

Thank you for the tip of shorting P- and B-.... I could't figure out why it was not working! But now it is!

[@gemsungelectronics460]

I am very glad it helped! Thank you for watching!!

[@kmieciu4ever]

I thought mine was broken, LOL :-)

[@gemsungelectronics460]

@kmieciu4ever Thank you for watching!!

[@Nameideaspls]

Great video. Learned more during these 7 min than from any other youtube video on the subject.

[@gemsungelectronics460]

Thank you for watching!

[@AZ-vk7oe]

2:28 Remember to check HY2120 Series chip marking and look up the variable values for overvoltage, undervoltage in the datasheet. Better don't blindly trust the seller. Model HY2120-CB for example 2.90±0.08V overdischarge detection voltage. HY2120-AB maybe bad for low current discharge (small voltage drop across load) because overdischarge detected much lower @ voltage 2.30±0.08V! 6:39 is a very useful reminder. A micro switch push button can be permanently connected between B- and P- in order to reset/boot the protection board every time when installing the batteries, eg when used in conjunction with a battery holder.

[@gemsungelectronics460]

Thank you very much!! Your comment is very helpful!

[@veryA72]

You deserve a lot more subs

[@gemsungelectronics460]

Thank you for watching!! More videos are to come!

[@povilasstaniulis9484]

Good video. That text-to-speech program sounds a bit weird though. I've recently got myself an HX-2S-D20 for monitoring a couple 14500s which will be driving an (Li-ion modded) LED lantern via a buck converter (grand overkill, I know, but it was cheap). Same Hycon HY2120-CB chip as this one but it does have balancing.

[@gemsungelectronics460]

Thank you for your comment! I will definitely do something with the tts. Thanks!!

[@alsy2011]

in 6:24. if the new batteries are installed. i need to manually short the -PB. may i know if this is the -POWER and -Battery (0 Volt)? i just short this two terminals to have an outpout power?

[@gemsungelectronics460]

Thank you for watching! B- is the minus pin connected to the battery. PB- is the minus pin connected to the Power (Load). You need to short these two pins together to have the output power. Alternatively, you can also connect the charger to the PB+ and PB- pin, and this will enable the MOSFET immediately. Thank you!

[@alsy2011]

@@gemsungelectronics460 thank you very much. new subscriber here.

[@alsy2011]

i will permanently install the bms in my rc car together with 2s battery holder. So my main purpose here is the under voltage protection. i will change the batteries when its low voltage.. (14500 lion batteries) then i will put tactile switch to -B to -PB. Thank you so much for the wonderful explantion on this video.

[@gemsungelectronics460]

Thank you very much for subscribing! Have fun with your project!

[@mohammadsaqib405]

Thank you for great information

[@gemsungelectronics460]

Thank you for watching!

[@reetadevi6500]

OK very good gemsung eloctronic ago you solve my problems thanks

[@gemsungelectronics460]

Glad it helped! Hope you good luck!

[@changeagent228]

If a BMS like this simply outputs no voltage and all the cells are 4v is there a way to reset it or has it failed open circuit?

[@gemsungelectronics460]

Hello, that's a tricky situation. Try disconnecting the cells from the BMS and connect it again. If the output still shows no voltage, then there is a good chance that the BMS have been damaged. If you have a DVM, try checking some signals on the BMS. (Especially the signals for FET control) The schematic included in this video can serve as a reference. Hope you find out the problem. Thank you for watching!!

[@changeagent228]

@@gemsungelectronics460 Thanks I will try that.

[@ahmmadsaif3100]

Can i charge four 18650 (for 7.2 volt & each 2000mah)bettary with this circuit??

[@gemsungelectronics460]

This module is made to charge two batteries in series. You can charge 4 batteries by connecting 2 batteries in parallel and 2 batteries in serial. Also note that the charge voltage should be in the range of 8.4V to 9V. If you use 7.2 volts for charging, then the batteries will not be fully charged.

[@amaurycarneiro2626]

Hi, what's difference between HX-2S-01 and HX-2S-D01? Thanks.

[@gemsungelectronics460]

Hello, the main difference seems to be the maximum operating current. - HX-2S-01 : Maximum operating current 5A - HX-2S-D01 : Maximum operating current 8A Besides that, other specifications seems to be the same. Thank you.

[@amaurycarneiro2626]

@@gemsungelectronics460 Thank you.

[@on1ytheb3st]

What is a similarly sized 2S BMS with balancing?

[@gemsungelectronics460]

Hi, there are several modules supporting balanced charge. Use the keyword "2s bms balance" in your preferred search engine. One example is hx-2s-jh10 module which supports 2s with passive balancing!

[@0124akash]

Sir , how to make 2S2P battery bank ?

[@gemsungelectronics460]

Hello, In order to make a 2S2P battery bank, just treat 2 batteries as one. Connect two batteries with the same polarity, and then connect these two packs in series. Thank you for watching!!

[@maviressam5042]

hello, I wonder if bms circuit boards automatically cut off the charge when the charge is full? I would be glad if you answer. good work.

[@gemsungelectronics460]

Hello, I am quite sure all BMS modules have some means of charge and discharge protection function. Some BMS modules have an extra function called balanced charging, which balances the voltage of each cells during charging. Hope this has answered your question. Thank you for watching!

[@maviressam5042]

@@gemsungelectronics460 Thank you for your reply and your interest. Regards

[@tomgob5236]

Which pin is the PB - ? Thanks

[@gemsungelectronics460]

Hello, very good point! The PB- pin in the block diagram of slide 3 is the P- pin of the module. Also, the PB+ pin is same as P+ in the module. Thanks for watching this video!

[@tomgobb2110]

@@gemsungelectronics460 thank you soon much for the video and reply, I couldn't find any solid info in this IC anywhere.

[@gemsungelectronics460]

Great to hear it helped! Stay tuned for more videos :-)

[@DanicoOmar]

Can this be used on 2S LiPo battery? Some vendors writes that it can but isn't the over discharge voltage 2.3-3V too low for LiPo?

[@gemsungelectronics460]

Thank you for your question! As you mentioned, LiPo batteries can be damaged if discharged below 3.0V, so you cannot use this module directly for LiPo batteries, since this module cuts off discharge at 2.9V (this module uses HY2120-CB). However, it may be possible to use for Lipo batteries if you change the controller IC to HY2120-GB, which has discharge protection at 3.1V. Thank you!

[@jimmatrix7244]

What is the model no for laptop 4S BMS with charge/discharge, temperature, balancing and short circuit protection board?

[@gemsungelectronics460]

Hello, I am sorry but I have no idea what BMS model is used for any laptop. Also, I don't think they use commercial BMS modules in their laptops when they can implement it on their board. Thank you for asking!

[@FFNFlyingsnake]

ok but are the overvolt detection above 4 V not too hight a 18650 cell battery shouldnt be charged over 3.65 V or am i wrong??

[@gemsungelectronics460]

The charge voltage of Li-Ion based 18650 battery is normally 4.2V. If you use lower voltage, it wouldn't be fully charged.

[@FFNFlyingsnake]

@@gemsungelectronics460 ok thank you so can i use this bms build to charge 4 batteries 2 in series and 2 paralell?

[@gemsungelectronics460]

Yes that is doable.

[@reetadevi6500]

I have do not regulator to charge 1 Lithium battery to the Solar so l charge 1 Lithium battery to 4.2 volt solar panel I am correct

[@gemsungelectronics460]

You can use the 3.7v protection module you mentioned before. It is usually equipped with a regulator on the module. The connection should look like this, Solar panel - 3.7v protection module - 18650 battery

[@ED99LAM]

very useful information , cc n cv charge control and how to reset ***

[@gemsungelectronics460]

Thank you for watching!!

[@Petardozord]

would be great if it shows that works. because i have no clue if either my solder sucks, or component.

[@gemsungelectronics460]

You can add a current sensor, such as INA219, or use the current measurement from the DVM. If the current is flowing to the intended direction, I think you have soldered correctly.

[@reetadevi6500]

I am charging 1 lithium battery to 5 volt charger with protection 3.7 volt module and its charge very easily from 5 volt charger so I am charge the 1 Lithium battery to 5 volt solar panel with protection module I am correct

[@gemsungelectronics460]

Great idea. One thing to note, your solar panel might not give out 5v all the time, so you'll need extra controller to increase the efficiency. Besides that, it is a great idea. Thank you for sharing your idea!

[@prakashsuryawanshi6211]

Nice video How many voltage require for charging and current also

[@gemsungelectronics460]

Thank you. For this BMS module, you can charge two 18650 baterries, so you would need to supply 8.4V to this module (4.2V for each battery). The current depends on the capacity of your battery. It is safe to limit the maximum current to half the capacity of the battery. For example, if you are using two 2000mAh batteries, the maximum current supplied to this module should be limited to 2000mA (or 2A), which is 1A for each battery. Thank you.

[@prakashsuryawanshi6211]

@@gemsungelectronics460 thank you for suggestions

[@seffanaalliera877]

can you recommend me some 2s bms module with balancing feature?

[@gemsungelectronics460]

Hello! I don't currently have any particular recommendation for you, but you can easily find the one which suits your needs by searching "2s bms balance" on google. Any product (or module) should be ok, as long as you use it within specifications. (Especially current limits). Also, you need to be aware which type of batteries you wish to use. For example, Lithium based batteries such as Lithium polymer and LiFePo4 have different charge/discharge voltages which requires different BMS modules. Feel free to ask more questions if you have any. Also, check out my video of 4S BMS module with balance feature. kzbin.info/www/bejne/d2PJY4CGf5ydh7c Thanks!

[@prakashsuryawanshi6211]

Both batteries in series then how to charge? In series or separate

[@gemsungelectronics460]

This module is capable of charging two 18650 batteries in series.

[@reetadevi6500]

I charge only 1 Lithium battery to 5 volt solar panel 80 OR 100 MAH

[@gemsungelectronics460]

Good idea. How are you planning to regulate the voltage to 4.2V? Any controllers used? MPPT? PWM?

[@reetadevi6500]

I use 5 volt solar to charge 1 lithium battery or I use 4.2 volt to charge 1 lithium battery

[@reetadevi6500]

I am charging the battery with 5 volt charger so I am t charge the 1 Lithium battery to 5 volt solar panel I am correct or not

[@reetadevi6500]

I charge the battery with 5 volt solar panel

[@gemsungelectronics460]

How large (wattage) is your solar panel? You need at least 8.4V to charge 2s 18650. Also note that the wattage for the solar panel is an ideal value which isn't easily be achieved in real world.