JKBMS PB2A16S15P burning balancing resistor

[zmen89]

Greetings to all! I am a beginner and I want to assemble the battery myself. I ordered a JKBMS PB2A16S15P board from China. For the test, I connected the batteries according to the instructions. With the 8s running, everything was great. but when I tried to connect 14, the board blew smoke from the balancing connector No. 3.After disassembling the board, I saw burned resistors. And I was surprised that the tracks from connector 2 and 3 are connected together.
I don't have a lot of knowledge in electronics, but there looks like an error in the board tracing and I got a short circuit.
Board version 15.1 made 20240119

 

[kommando]

Happened to me

covered in this thread

Dead cell sample lines on JKBMS JK-B2A24S JK-BMS >> FIXED

See post 13 for the pic, for some reason my type of board has 2 P8 pins and tracks, most only have one resistor fitted but both mine were populated so I had a spare. I have now bought some resistors in case more go but there were no 1/16W 0.01 Ω resistors around so I bought 1/8W 0.02 Ω...

diysolarforum.com

and

JK BMS Cell Count Problem on B2A24S20P

Yes, I am using the same harness. I will order or make a new one to check that, but the third BMS is working fine on that same harness. do you use fuses on each balance lead coming from the BMS to each cell?

diysolarforum.com

You need to find the fault that caused the blow (looks like P8 as only P8 has 2 optional tracks and resistors and you only use either not both).

Once you have sorted out what caused the blow. then

So your choice, bridge the resistor and put a fuse in the line, or replace the resistor. 1/16W 0.01 ohm resistor marked R01 on the board.

 

[zmen89]

Happened to me

covered in this thread

Dead cell sample lines on JKBMS JK-B2A24S JK-BMS >> FIXED

See post 13 for the pic, for some reason my type of board has 2 P8 pins and tracks, most only have one resistor fitted but both mine were populated so I had a spare. I have now bought some resistors in case more go but there were no 1/16W 0.01 Ω resistors around so I bought 1/8W 0.02 Ω...

diysolarforum.com

and

JK BMS Cell Count Problem on B2A24S20P

Yes, I am using the same harness. I will order or make a new one to check that, but the third BMS is working fine on that same harness. do you use fuses on each balance lead coming from the BMS to each cell?

diysolarforum.com

You need to find the fault that caused the blow (looks like P8 as only P8 has 2 optional tracks and resistors and you only use either not both).

Once you have sorted out what caused the blow. then

So your choice, bridge the resistor and put a fuse in the line, or replace the resistor. 1/16W 0.01 ohm resistor marked R01 on the board.

Thank you for your reply! It turns out that I can only use the board on the 8s after replacing the resistor without any problems? And if I want to use all the cells, don't I need to put a resistor on the 9th track? And in that case, cell 9 won't balance? I don't understand why jkbms short-circuited cells. I still have time to refund the fee.

 

[zmen89]

I figured out the scheme. The board has two outputs for cell #8. For some reason, the instructions do not say anything about this. Thanks for the help!

 

[kommando]

The pinouts are wrongly documented too