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DIYBMS v4 thoughts
#21
Have been reading this forum for a few months now with the idea to create a battery pack for our 'Dasha' instead of buying an AGM battery.
So far I have collected a bunch of cells and ordered components to set up a testing environment.

I decided to give DIYBMS a go and have just placed an order with JLCPCB, and got a question from the reviewers about component polarity.

below picture is what they sent along with the question, I have no idea what the right polarity should be, appreciate if anyone can enlighten me (and save soldering if the placing is wrong indeed).


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#22
Well, first off your image is nothing but resistors and diodes on a black background. No traces or silk screening is visible. Perhaps try redoing the screen capture or how ever you got the image.
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#23
Above is what was attached to the email. Below image comes from the order page on the JLCPCB website, hope this is more helpful:

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#24
I don't see any difference between the two, unless I'm missing something.

What was it exactly they asked? It's possible they are only asking due to there being diodes on the board. Sometimes they just contact to verify they are reading it correctly.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

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#25
Thanks for your answer, I have the same confusion, below is the message from JLCPCB:

Hi Sir,

Well got your order with many thanks~
Sorry to bother you, but there is one thing that we want to confirm with you about your SMT order before proceeding.

As shown below, we are not so sure about the polarity for the components below is correct or not, could you please kindly have a check?

Can we just make it as shown in the picture?
Your early reply will be highly appreciated, thank you so much!
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#26
edit I made a mistake
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#27
(03-21-2020, 07:01 AM)chmistry Wrote: Thanks for your answer, I have the same confusion, below is the message from JLCPCB:

Hi Sir,

Well got your order with many thanks~
Sorry to bother you, but there is one thing that we want to confirm with you about your SMT order before proceeding.

As shown below, we are not so sure about the polarity for the components below is correct or not, could you please kindly have a check?

Can we just make it as shown in the picture?
Your early reply will be highly appreciated, thank you so much!

I would post this on the main forum for the project to see if anyone else ran into this issue with JLC.

I have assembled 20 of these boards.  The first one I assembled failed because I placed the solder paste by hand instead of using a stencil.  I ordered a stencil from OSH Stencils and it made the assembly work a lot better.  Now I have to install them in one of the BYD batteries I have and test the system.



P75-E2 Pogo pins made programming the array of boards a pretty easy job.  

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#28
I have assembled the first BYD battery with DIYBMS.  I wired it up to utilize the built in wiring harness.  I just have to run wires to monitor the temperatures of the cells. 


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#29
(03-22-2020, 10:13 PM)BuffaloPowerWall Wrote: I would post this on the main forum for the project to see if anyone else ran into this issue with JLC.


Good idea, I'll do that. Thanks for your feedback.
I'll post foto's here when I receive the units.
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#30
Has anyone here done the JLCPCB assembly route recently?  I'd like to give this one a try - was wondering what your experience was with their work, pricing, shipping times, etc.  I can solder pretty well by hand, but these parts are just too small for my vision.  Thanks!
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