Active Balancer vs Passive Balancer (Part2)
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- เผยแพร่เมื่อ 2 ต.ค. 2022
- This is the part 2 of the balancer series.
It contains the test results and explanations for some unsatisfactory results in the part 1 video.
Hope these series of videos help you selecting the best balancer option for your needs.
Thank you! - วิทยาศาสตร์และเทคโนโลยี
Very good Video, thank you -- but three Cells of 2.5AH in Series stay 2.5AH in total, not 7.5AH
Yes. It's the voltage that's multiplied, not the current.
Золота ти людина! так просто і зрозуміло та інформативно!
Larger cells on a lower capacity rated active balancer would make no difference... it would just take longer to balance them if they get out of whack... I used one on a 30Ah pack 3s16p design, took ages to balance but that is because the BMS and its passive balancer somehow managed to make banks 1 and 2 go to 0 volts and bank 3 was at 4.25(ish) volts probably closer to 4.3-4.35 volts because my meter was reading low because of a dead battery in the meter. So the amount of energy it had to transfer was closer to what a 100Ah or 500Ah would require... because I basically had to transfer the entire capacity of one bank into the other two. It took so long that I had to help it along by charging the 2 low banks and discharging the high bank via external chargers and loads.
If your bank is carefully matched (as mine was, within 50mAh or less out of 30 000 mAh total), then your balancer wont do much work as the cell banks are going to be close just naturally, no matter how large the bank, what matters is the difference in capacity between each bank. A gigantic 1000 Ah pack could be balanced by an active balancer made for a 20Ah or less pack if either the charge current is low enough and you are OK with the slow balance, or if the pack is very well balanced so each bank of cells is very close to the others in capacity right off the bat.
If you took my pack, and you multiplied it by 10, so its 3s160p, it would have ~300Ah and the balancer I use would still be sufficient because I would have matched all the cells so that each parallel bank is very close to the others (like
Very informative 👍
Thank you verymuch
Thank you for watching!!
Thanks for this information.
Thank you for watching!
More interesting videos are to come!
Rock!
Keep going with this channel!
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New project is on the way!
Thanks, very clearly
Thank you for watching!!
Amazing. Thank you very much 👏
Thank you for watching!!
thanks for providing such an interesting experiments
I am wondering, about using at the same time both passive and active balancers, it seems like a good idea. You showed it on you representation scheme but I didn't hear any words. is that a good and safe approach. It looks like passive one works great for charging, active for discharging. Mixing them altogether helps to achieve better overall result. Waiting for your reply. Thanks!
Hi! Thank you for watching!
Passive balancing works well for charging, and active balancing works well in both charging and discharging.
I'm not sure about the benefit of using both balancers at the same time.
Active balancer balances the cells whenever the potential is above threshold, at a cost of increased standby power consumption.
Passive balancer, on the other hand, dissipates power while balancing.
Active balancers are good when your cell capacity is large and can be charged frequently.
If your cell capacity is small and not able to charge frequently, then I recommend using the passive balancer.
Hope it helps!
@@gemsungelectronics460 yep, it helps. Thanks for such a comprehensive explanation
Thank you for the Video!
Can you tell how high the standby power comsumption is?
Hi,
That is a very good question.
Let me find out (or figure out how to test) and get back to you!
Thank you for watching!
@@gemsungelectronics460 Thank you!
That would be very interesting.
thanks
Thank you for watching!!
what did you use to plot the battery voltages?
Hi, I usually use the matplotlib from Python and sometimes use the plot function from MATLAB.
Thank you for watching!!
in time 1:01 of the video you say: 2500mAh x 3 = 7.5Ah. Does this mean you have batteries connected in parallel? Should´t they balance themselves?
Hello,
I used three 2500mAh capacity batteries in series.
In this case, we might need a balancer to balance the cells.
However, for the parallel configuration, no balancer is required, since the batteries will share the power between each other.
Thank you for watching!
@@gemsungelectronics460 Ok, but in the case of batteries connected in series, capacity should be still 2.5 Ah. Not 7.5Ah.
I agree with Respecto4444 🙂
@@cube.in. spot on
Can active balancer give me 12.8 volt 30amps continuesly
Hi,
Active balancing is for balancing the cells when the voltage can be unbalanced while changing and discharging.
The capacity for the balancer is dependent on the product itself. (It can vary from product to product)
If you're asking whether it can be used in a 12.8v/30a changing environment, then I would like to suggest finding out how much off balance your cells can be and pick the appropriate balancer for your application.
Hope it helped.
Thank you for watching.
@@gemsungelectronics460 what can I use to make my lithium battery 12.8 volt give me continuesly 12 volt 30amps for long time
The assumption is wrong. The size of the battery pack is not the problem, the load and charge vs the size of the balancer is the actual problem.
As example. If i charge with 100a and the battery pack is 300ah. One cell is used and has a max capacity of 260 or 280ah. Then there would be a difference of 20ah+ between lets say cell 1,2,3 and the used cell 4. How long would it take to move 20ah+ with a 1a balancer? A 4a balancer?
This is the main problem. But if you charge slowly, and.. discharge slowly.. its no problem. If cell 4 was 295ah instead of 260 or 280ah, it would help a lot as well. But you need to move 20ah+ into or out of, cell 4, faster than you discharge or charge and you cant do that if you undersize the balancer vs the load. You can however add 5* 5a balancers for some very greatly improved effect.
Many balancers start balancing a bit late, with gives you limited time to move those aH. As example, my balancers start at 3,35v on my lfp. The bigger the cell difference & the bigger load, the more you need stronger or multiple balancers.
Thank you for your comment!
The charge and discharge rate tend to increase with the size of the battery pack.
The point of the comparison is that you need to use a balancer that can sufficiently balance the battery pack you are using.
Thank you for watching!
Meaning that the balancer Amperage capacity should be higher than the charge current, for balancing big capacity battery packs.
Thanks for this information.
Thank you for watching!!