Beginners Guide to Processing 18650 Cells | Cell Database


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How to check the stability of BMS?
#1
Hello there. There is 16s 35A BMS. I used it for electric bicycle. 1 serial battery was rubbish. BMS burned, I guess. How do I know that it is intact
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#2
if bms burned its not intact any more.
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#3
I have BMS for electric bicycle. The burning smell came from my BMS device. A series battery has failed. The output voltage was inconsistent. How do i understand how it works




Can 16s bms be used as 14s?
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#4
What?
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#5
And I am still not getting any of the pictures you post Sad
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#6
I have BMS for electric bicycle. The burning smell came from my BMS device. A series battery has failed. The output voltage was inconsistent. How do i understand how it works




Can 16s bms be used as 14s?
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#7
If you look at the bms, you see there are several solder pads that have no components. So this same board is used for even greater series connections. If you know what portions failed, you maybe be able to remove the damaged portions (as long as it's a duplicated section) and drop it down to 14s.

From the images, I can't see any damage. The quality is good enough to see clearly (more light would help take better pictures).Also, make sure your camera is taking higher quality pictures. 5MP is pretty weak, especially in lower light situations. You really need to either be close to the board with good light with 5MP, or have 12MP that can handle the higher quality at further distances.
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#8
(07-06-2017, 01:07 PM)Korishan BMS\ye Wrote: If you look at the bms, you see there are several solder pads that have no components. So this same board is used for even greater series connections. If you know what portions failed, you maybe be able to remove the damaged portions (as long as it's a duplicated section) and drop it down to 14s.

From the images, I can't see any damage. The quality is good enough to see clearly (more light would help take better pictures).Also, make sure your camera is taking higher quality pictures. 5MP is pretty weak, especially in lower light situations. You really need to either be close to the board with good light with 5MP, or have 12MP that can handle the higher quality at further distances.

Could the episode belonging to a single series be burned? It does not appear to be physically damaged. I took the photos closely because I wanted them to look more detailed. My phone is 13 megapixels. I guess the light is not enough. I guess I will have to try again.
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#9
I'm guessing you mean the single cell? The BMS is a series of single cells.
It is possible that a chip has failed without showing any outside burning. The only way to test the chips is to take them off the board and check with a multimeter or some other tester. More work than it is worth, really.

But you could just connect wires 0 - 13 instead of 0 - 15. That should give you a 14 cell series. Unless the BMS is set to need a minimum voltage of 45V or so. If that is, then you won't get the full discharge of the cells if you go to 14.
16s: bottom voltage 3.2V = 51.2V, top voltage 4.1V = 65.6V
14s: bottom voltage 3.2V = 44.8V, top voltage 4.1V = 54.4V

You are still within range for a 48V setup, it just wont last as long. Or the BMS may cut out (turn off) early
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