DIYBMS v4 thoughts

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chmistry

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Mar 20, 2020
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8
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).



image_qhexwn.jpg
 

Korishan

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Jan 7, 2017
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6,572
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.
 

chmistry

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Mar 20, 2020
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Above is what was attached to the email. Below image comes from the order page on the JLCPCB website, hope this is more helpful:


image_gvfmyq.jpg
 

Korishan

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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.
 

chmistry

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Mar 20, 2020
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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!
 
Joined
Oct 8, 2016
Messages
31
chmistry said:
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.


image_bwsgof.jpg

image_tzpqfa.jpg


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


image_gqzlzp.jpg
 

Panozguy

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Mar 28, 2020
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6
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!
 

Batteriapan

Member
Joined
Feb 20, 2017
Messages
35
Panozguy said:
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!

I'm interested in this too. Perhaps a joint order?
 

vk2emp

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Joined
Oct 28, 2019
Messages
2
I too have just ordered a pre assembled set of monitor and controller boards. The only parts I need to put on are the headers, connectors, LED for the controller and the Wemos, and the ATTiny841 SSU for the monitors. The boards haven't arrived yet, they're still in the mail. As my battery sank below 12.4 volts, I decided it was time to whip up a balance cable, and hook it to the hobby charger (which has a LiFePo4 Balance charge program) to get it back up to a decent start of charge, so the balancer boards when they're built and fitted, can finish the job.

Charging a 180Ah LiFePo4 with a hobby charger limited to 5A (crap cables, no problem for the charger to do 20A), is painfully slow ;)
 

gigaz

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Apr 8, 2019
Messages
11
It may seem like that, but once you factor in overwhelmed national customs in some countries it starts to make sense to organise a group buy in a country where that isn't an issue, and then distribute them locally.
Plus Jcbpcb makes you buy extra, not enough for another system, but way too much for just a few spares.
 

sunseeker

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Aug 30, 2017
Messages
20
Sorry for the noob question, but how can I order these boards preassembled from JLCPCB? I know I can upload the gerber files for the boards, but how to go from there?
Thanks!
 
Joined
Oct 8, 2016
Messages
31
sunseeker said:
Sorry for the noob question, but how can I order these boards preassembled from JLCPCB? I know I can upload the gerber files for the boards, but how to go from there?
Thanks!

Stuart has a new video on ordering PCBs.

 
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