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Chemistry-specific?

Posted: Oct 16 2019 2:48pm
by quamau
Hi there,

I have ordered one such BMS from lithiumbatteriespcb.com, and it just showed up. In the meantime, I realized that I mistakenly (stupidly) ordered the LiFePo4 version instead of the LiIon version.

While I wait for my cells to arrive, my question to you expert folks is: will I be able to change the default parameters (like LVC HVC etc) from the bluetooth/PC interface, or there is something in the hardware that makes it specific for the LiFe chemistry?

Thanks for your replies

Re: bluetooth BMS?

Posted: Oct 16 2019 3:11pm
by eee291
There is no hardware difference, just change the appropriate values and you are good to go.

If you bought a BMS with the wrong cell count it is a bit more difficult to set up.

Re: bluetooth BMS?

Posted: Oct 16 2019 3:43pm
by quamau
Thanks, relieving news. It's quite difficult to understand from "documentation"...

Cell count is OK, I was sleepy when ordering but not too drunk :-)

Re: bluetooth BMS?

Posted: Oct 17 2019 7:59am
by thundercamel
Did you get the PC interface? It has a few more parameters available than the bluetooth app.

Re: bluetooth BMS?

Posted: Oct 17 2019 8:05am
by plateau
Could anyone help me?
plateau wrote:
Oct 02 2019 9:33pm
Hi, people, how are you doing?

I'm trying to repair my bluetooth BMS but I don't know which component is that marked with this blue arrow. I know it's a diode but I don't know if it is a rectifier, schottky or a zener. It fried after the 10R resistor (white arrow) has blown.

Further, I have replaced the µC (ATMEGA328P) and the 10R (white arrow).

Does anybody can help me?

Image

Re: bluetooth BMS?

Posted: Oct 17 2019 10:43am
by mati
I bought the Smart Ant BMS 300A from IC GOGOGO Store.
https://www.aliexpress.com/item/3282682 ... b201603_55
They gave me a link for the English apk. and installations if any one need it.
http://mysharegadget.com/539657894?spm= ... 3e5fEmRhLa

Re: bluetooth BMS?

Posted: Oct 17 2019 11:04am
by thundercamel
plateau wrote:
Oct 17 2019 8:05am
Could anyone help me?
plateau wrote:
Oct 02 2019 9:33pm
Hi, people, how are you doing?

I'm trying to repair my bluetooth BMS but I don't know which component is that marked with this blue arrow. I know it's a diode but I don't know if it is a rectifier, schottky or a zener. It fried after the 10R resistor (white arrow) has blown.

Further, I have replaced the µC (ATMEGA328P) and the 10R (white arrow).

Does anybody can help me?

Image
All I can observe is it looks to be an older revision of the JBD BMS. I have one labeled v1.3, one labeled v1.4, and yours doesn't even seem to mention a version. I'd try a standard rectifier diode and see if it works, but proceed at your own risk since my knowledge is limited.

Re: bluetooth BMS?

Posted: Oct 21 2019 11:06am
by plateau
thundercamel wrote:
Oct 17 2019 11:04am
All I can observe is it looks to be an older revision of the JBD BMS. I have one labeled v1.3, one labeled v1.4, and yours doesn't even seem to mention a version. I'd try a standard rectifier diode and see if it works, but proceed at your own risk since my knowledge is limited.
Thank you so much for your attention, Thunder.

My BMS has a glue over the components and it makes the things hard to identify which components are soldered.

In your case, is there this glue? Even though a different version, I think the project is very similar (his area is related to voltage regulation). If so, could you try to see what is marked over the components (especially this diode).

One more time, thank you so much for everything.

Regards,

Pedro Rosa.

Re: bluetooth BMS?

Posted: Oct 21 2019 2:12pm
by thundercamel
There does seem to be some sort of conformal coating over that end of the board, up to the main mosfets. I did try to find a similar diode before my last post, but the layouts are pretty different.

Open image as a new tab for full resolution:
Image

Image

Re: bluetooth BMS?

Posted: Oct 22 2019 3:26am
by Jan-Erik-86
I've been reading on this thread, but haven't been able to read all pages. However, after reading over half the thread and googling, i've yet not been able to find the answer to my question, so hope someone can explain this to me, and I'm sorry if this have already been asked previously.

I'm looking at this BMS to replace my none-smart BMS: https://www.ebay.com/itm/14S-51V-60A-40 ... 4053333234
It comes with either UART and RS485, or with UART only.
I only need to program it once from the computer (as i've read it's not fully programmable from the phone/trough BT?), and after that i'll only need the BT module to monitor it.
But what i can't figure out, is why does it seem that most people buy the dual communication BMS and yet only the UART/BT module for it? Why pay extra for RS485 that will never be used? Isn't RS485 only an alternative for UART, or am i missing something here...?

Also, assuming it's using poor FETs, and the 20-60A BMS' are all identical other then the number of FETs installed, would it be wise to buy the 20A version instead and simply replace or install more FETs before use?

Re: bluetooth BMS?

Posted: Oct 22 2019 8:38am
by thundercamel
The JBD models from AliExpress like I pictured above only have a UART interface. The PC software does have more parameters available, such as temperature limits. I don't have any experience with the ebay model you linked, but I have the same assumption that the RS485 is an alternative to UART like you said, and seems unnecessary unless you have some custom plans for it.

I just bought the 60A version as safe overhead since I use only half for now. ElectricGod does buy the lower current models that have fewer FETs, and replaces them documented here.

Re: bluetooth BMS?

Posted: Oct 24 2019 2:26pm
by plateau
thundercamel wrote:
Oct 21 2019 2:12pm
There does seem to be some sort of conformal coating over that end of the board, up to the main mosfets. I did try to find a similar diode before my last post, but the layouts are pretty different.
Thank you so much for your cooperation, Thunder.

My board is the v1.1...

I was checking the board to "create" the schematic and I realized there is 7133-1 (3.3v @30mA) regulator in the path. The highest input voltage that it can deal is 24v. So, I will add a 4.7v zener and it will probably solve the "problem".

One more time, thank you for all.

Regards,

Pedro Rosa.

Re: bluetooth BMS?

Posted: Nov 01 2019 2:59am
by pomah
I could not really find an answer for this, what is the best quality BMS that is available today?

I would need a 13S 30A or similar for a new battery build...

Price is not really the priority but quality and the possibility to monitor battery stats

Re: bluetooth BMS?

Posted: Nov 01 2019 3:52am
by john61ct
Check out Batrium.

Also Orion, Zeva and REC Q BMS

Re: bluetooth BMS?

Posted: Nov 01 2019 5:22am
by knurf
pomah wrote:
Nov 01 2019 2:59am
I could not really find an answer for this, what is the best quality BMS that is available today?

I would need a 13S 30A or similar for a new battery build...

Price is not really the priority but quality and the possibility to monitor battery stats
This one might be worth considering?

https://energusps.com/shop/product/tiny ... 0a-750a-36

Re: bluetooth BMS?

Posted: Nov 01 2019 11:47am
by john61ct

pomah wrote:I could not really find an answer for this, what is the best quality BMS that is available today?
Best to start a new thread for this question, rather than derail this one which has a useful narrow focus.

and define your needs more specifically there to get better answers put right in the title


Re: bluetooth BMS?

Posted: Nov 03 2019 12:27pm
by larsb
My 300A smart BMS bought from ICGOGOGO has started to fault, reason is that cell1 is seemingly dropping to nearly zero volt. It’s on and off at random. Anyone else got the same issues? I’d guess a poor connection would be less digital (and go to zero) so i suspect it is unfixable.

Re: bluetooth BMS?

Posted: Nov 03 2019 1:41pm
by flippy
first i would start checking connections, also on the board. might be a dodgy connection on the board as well.

Re: bluetooth BMS?

Posted: Nov 03 2019 3:21pm
by larsb
I wiggled the cable connectors with zero difference. It might be on the board like you say. I’ll check there also.

Re: bluetooth BMS?

Posted: Nov 03 2019 3:53pm
by flippy
dont feel, measure.

Re: bluetooth BMS?

Posted: Nov 03 2019 4:00pm
by larsb
super difficult to measure as it's random.. that's why i try to provoke it.

Re: bluetooth BMS?

Posted: Nov 08 2019 1:23pm
by plateau
Hi, guys, how are you doing?

Let me ask you a thing: I would like to buy a new BMS to replace the old one (that fried during the firmware update). This seller has some different versions (20, 30, 40 and 60A). So, my question is: if I choose the 20A and replace all chinese mosfets, will I get a higher current rate (replacing, for example, to IFRP4110)?

The difference between 20 to 60A is US$10 but I don't know if the mosfets used in the 60A version are really good.

https://www.ebay.com/itm/14S-51V-60A-40 ... p0uG1fCtwQ

Thanks in advance.

Regards,

Pedro Rosa.

Re: bluetooth BMS?

Posted: Nov 13 2019 4:18am
by zipoman
Hi guys,
you have a lot of experience with chinese BMS so I think you can give me some advice.

I try some upgrade on 4S80A smart BMS, I use external fet and external resistor and now I can balancing without problem over 1A/cell. I try this upragede on 8S/12S and 16S version and I see one fault.

During balancing on 4S cell voltage is stable without fluctuations, but 8S 12S 16S during balancing with my upgrade some cells increases voltage without reason. Increase is about 50mV and it´s fake, only for 1-2 second but BMS set ON resistor on this cell.

Anyone have an idea why these increases are happening?

Thanks a lot

Re: bluetooth BMS?

Posted: Nov 13 2019 11:14am
by thundercamel
Nice mods. I've been chasing a similar problem, just with group 11 on my wife's BMS. During balancing I caught a screenshot of group 11 reading 17mV higher than it actually was, confirmed with my meter connected to group 11 at the same time. I don't think the problem ever happens when the BMS is not balancing.

Balancing off:
Image

Static balancing on without charging, just 10 minutes later:
Image

Re: bluetooth BMS?

Posted: Nov 14 2019 4:17am
by zipoman
After balancing stop what is the cell voltage?