bluetooth BMS?

[thundercamel]

In practice, what are the downsides of using the chinese BMS units as is? I'm guessing the HY3215 mosfets create more heat because they have more resistance than AOT2500 mosfets?

As your amperage goes up, you risk blowing out a trace without soldering in some more copper properly?

I have two of the 14s 60a BMS units from ailexpress, one of them I use at 25a just fine, and the other I plan to use at ~40a. I suppose I could peek inside before I use it.

 

[rolf_w]

Does anyone know what joints to add/remove for the 22s configuration?

The TI documentation for the bq769x0 Battery Monitor Family e.g. http://www.ti.com/lit/gpn/bq76920 explains it in tables 8-1 to 8-3. This BMS carries two bq76940 thus allows for 2x15 cells to connect.
For a 22s arrangement you need to short 8 cell inputs - you have several possibilities to do this e.g. keep it symetric and short 4 cell inputs on each chip to have them configured as "11 Cells" units (check it out in the table). In your current configuration remove the short between BC7-BC8 and BC22-BC23.
r

 

[ElectricGod]

Does anyone know what joints to add/remove for the 22s configuration?

20-30S.jpg

That's a really good question. I don't know exactly. So far, what I have done with these BMS is undoing the solder bridges so I can use them at whatever is their maximum cell counts. However "figuring out" shouldn't be hard to do. Think in terms of what combination of jumpered positions gets the cell count you are after. I think if you assume you need to start with the lowest connection first and work towards the high cell, you will find a combination that gets 22S. Worst case, try it and see if it works or not.

 

[ctirad]

Thank you rolf_w.

 

[Darren2018]

Does anyone know what joints to add/remove for the 22s configuration?

The TI documentation for the bq769x0 Battery Monitor Family e.g. http://www.ti.com/lit/gpn/bq76920 explains it in tables 8-1 to 8-3. This BMS carries two bq76940 thus allows for 2x15 cells to connect.
For a 22s arrangement you need to short 8 cell inputs - you have several possibilities to do this e.g. keep it symetric and short 4 cell inputs on each chip to have them configured as "11 Cells" units (check it out in the table). In your current configuration remove the short between BC7-BC8 and BC22-BC23.
r

Do you know if this will work on this board? https://endless-sphere.com/forums/viewtopic.php?f=14&t=95962

 

[ElectricGod]

Does anyone know what joints to add/remove for the 22s configuration?

The TI documentation for the bq769x0 Battery Monitor Family e.g. http://www.ti.com/lit/gpn/bq76920 explains it in tables 8-1 to 8-3. This BMS carries two bq76940 thus allows for 2x15 cells to connect.
For a 22s arrangement you need to short 8 cell inputs - you have several possibilities to do this e.g. keep it symetric and short 4 cell inputs on each chip to have them configured as "11 Cells" units (check it out in the table). In your current configuration remove the short between BC7-BC8 and BC22-BC23.
r

Do you know if this will work on this board? https://endless-sphere.com/forums/viewtopic.php?f=14&t=95962

Pretty sure it will, but what the exact combination of jumpered connections is...that I don't know.

 

[rolf_w]

Do you know if this will work on this board? https://endless-sphere.com/forums/viewtopic.php?f=14&t=95962

As far as I know this board is manufactured by Shenzhen Jiayuda/Jiaxa Technology Co., Ltd. (http://www.jiabaida.com , JBD, e.g. downloads http://www.jiabaida.com/home-1.7-info-id-104-catId-52.html). It seems to be the latest version (v1.4) of the SP- series, which all use the above TI chip. Thus I am convinced that table 8-3 is applicable for this board.

 

[ElectricGod]

Do you know if this will work on this board? https://endless-sphere.com/forums/viewtopic.php?f=14&t=95962

As far as I know this board is manufactured by Shenzhen Jiayuda/Jiaxa Technology Co., Ltd. (http://www.jiabaida.com , JBD, e.g. downloads http://www.jiabaida.com/home-1.7-info-id-104-catId-52.html). It seems to be the latest version (v1.4) of the SP- series, which all use the above TI chip. Thus I am convinced that table 8-3 is applicable for this board.

Thanks rolf for posting this...you are right!

They have a newer version of the android app too as found here. I think most of us are running 2.1.1011 and they have 2.1.1022 listed. For those that don't read Chinese, hit the green box in the upper right area to download the new app.
http://shouji.baidu.com/software/24043119.html

It looks like this is an IOS app. If I had my iphone 6 on me, I'd check it out, but it looks like the android app.
https://itunes.apple.com/cn/app/%E5%B0%8F%E8%B1%A1%E7%94%B5%E5%8A%A8/id1361122947?mt=8

Looking at the site in "english" means "just barely english" LOL! This page takes us to most of the BMs's we mess with in this thread.
http://en.jiabaida.com/home-pp2-index-catId-26.html?page=1

This is the page for all the related apps for these BMS.
http://www.jiabaida.com/home-1.7-info-id-104-catId-52.html

I hunted around for a good while, but I don't see any firmware...too bad. I'm pretty sure the exact same firmware works on the entire product line and all that matters is the settings for your specific BMS. A coworker of mine is Chinese. I've asked him to hunt around and see if he can find the firmware. I looked for an email address too...nada.

If I had been a bit quicker at the punch, I would have thought about Chrome and google translate. Makes this website downright readable!

 

[rolf_w]

... A coworker of mine is Chinese. I've asked him to hunt around and see if he can find the firmware

in the download section a version "V1.A-20180514" of the JBDTools is available.

I wonder if this is the latest version? It looks the same as the version V1.8-20170822 displayed here. These versions amongst other things allow to select the language. Unfortunately part of the english text in the last tab "Other functions" of V1.A is missing. It would be helpfull to know what these functions are good for. r

 

[rio9210]

... A coworker of mine is Chinese. I've asked him to hunt around and see if he can find the firmware

in the download section a version "V1.A-20180514" of the JBDTools is available.


I wonder if this is the latest version? It looks the same as the version V1.8-20170822 displayed here. These versions amongst other things allow to select the language. Unfortunately part of the english text in the last tab "Other functions" is missing. It would be helpfull to know what these functions are good for. r

Yes, is the last version, but (at least me) I'm using the version V1.1-20160718, with no chinese on last tab (and casually here ant there when you click something).

 

[eee291]

Mine's in english on that last tab, but yours also has some other functions like: setting a password on the BMS, and some time function like read and set time.

BTW I used google translate on your pic, so janky lol

There was a discussion a while back about somebody hijacking the BMS, but I guess you can set a password now with the new software.
View attachment 1

I seem to have a 2018 version based on the program name

I think i need to set my locale to chinese if I want to be able to translate all those?????????

I downloaded it from here:http://www.jiabaida.com/uploads/soft/xiaoxiangBMS.zip

 

[ElectricGod]

Mine's in english on that last tab, but yours also has some other functions like: setting a password on the BMS, and some time function like read and set time.
I downloaded it from here:http://www.jiabaida.com/uploads/soft/xiaoxiangBMS.zip

Password? Wonder if that sets a BT password? I definitely WANT one!

 

[rio9210]

Mine's in english on that last tab, but yours also has some other functions like: setting a password on the BMS, and some time function like read and set time.
I downloaded it from here:http://www.jiabaida.com/uploads/soft/xiaoxiangBMS.zip

Password? Wonder if that sets a BT password? I definitely WANT one!

The password can be set from the app on smartphone (Android, at least). If someone tries to connect to bluetooth module (which is working ONLY in SLAVE mode, so only one connection at time) and doesn't have the password, he can't. If you have two smartphones with the right password for that BT module, only one can connect to it, not both in the same time. Slave mode, remember. I've opened a thread asking for the original password, I've found it on my own, by mistake...

 

[Bg-electric-cycle]

Anyone figured out this Xiaxiang BMS? Basics are easy enough although in its entirety?

 

[eee291]

What do you want to know? It's pretty straightforward, except that untranslated page of the PC program.

 

[izeman]

Anyone figured out this Xiaxiang BMS? Basics are easy enough although in its entirety?

How many pages of this thread have you read? Only the topic? I suggest reading all of it, and then ask a specific question that hasn't been answered before.

 

[ElectricGod]

lol...read every last word on ALL 28 pages...hahahaha. That should take no more than 5 or 10 minutes right?

 

[eee291]

I read it all.

Played some music in the background and it took me just a few minutes. You can just skim over the non-technical info

BTW Electricgod, it looks like you already have a mod thread. Why not turn it into a Wiki page?

If not, then I might make one. You guys can help me fill in a few blanks.

 

[trazor]

I read it all.

Played some music in the background and it took me just a few minutes. You can just skim over the non-technical info

BTW Electricgod, it looks like you already have a mod thread. Why not turn it into a Wiki page?

If not, then I might make one. You guys can help me fill in a few blanks.

Wiki? It's gone: https://endless-sphere.com/forums/viewtopic.php?f=32&t=94921&start=50#p1405432

I would love to see compiled information of all these 28 pages.. but we still do not have the tool. Technical difficulties

 

[Mikebike]

So frustrated right now!!!
Tried posting for a BMS with bluetooth in the used section here-no go.
Tried contacting electrigod to get one from him-no stock available right now. (Not complaining about him, he was very nice)
Found one on flea bay cause I want to finish my frign battery.
Just got it.
The only instructions are the label on the top cover u see in the photo attached. Surprised the label was in English! Thought I had a lifeline there.
So, I go to my google machine and type in the info on the label.
One video literally comes up in with a guy speaking----u guessed it, Chinese. Yay!
Read this entire thead and still confused because there are multiple BMSs being talked about including customization options and for me right now it is information overload!

Reaching out for help:
Not going to do any soldering for the custom p- c- connections/other ideas discussed in the thread above.
Just looking for basic instructions for wiring it so I can charge and go riding.
Specifically, I dont understand:
Where to start the first negative pin for the balance wires as there are 2 seperate pin connector locations on the board right next to each other?
I am doing 10s. This is supposedly capable of 8s to 24s. Is the first left pin negative, then positive to the right from the first negative pin till I run out of balance wires?
Why is the first pin connector 11 pins? then the second pin connector 15 pins? Thats 26 total pins? Are there 2 negative pins? One on each connector? cause 1 negative pin and 24 positive pins would give me 25 total pins not 26 for the max 24s capability? If I just use 10s for now the first connector should have enough pin locations? 1 negative 10 positive till I get to 11 total pins.
Is the bluetooth on the board somewhere on this model? It was listed as with blutooth included but no lcd screen included on the sellers sales page. I saw others where bluetooth was a separate unit you plugged into the main board? Am i missing the bluetooth module?
As far as the main wires go, I am just going to connect it based on the simplified wiring diagrams provided above---and thnks a bunch for those!!!

 

[eee291]

I read it all.

Played some music in the background and it took me just a few minutes. You can just skim over the non-technical info

BTW Electricgod, it looks like you already have a mod thread. Why not turn it into a Wiki page?

If not, then I might make one. You guys can help me fill in a few blanks.

Wiki? It's gone: https://endless-sphere.com/forums/viewtopic.php?f=32&t=94921&start=50#p1405432

I would love to see compiled information of all these 28 pages.. but we still do not have the tool. Technical difficulties

That's exactly what I meant. Poor choice of words on my part.

Also Mikebike, there is no such thing as two - on a balance port. For a 10S Battery you will need 11 wires, you start from B- and keep going up. But first I would like to see a picture from the underside of the BMS, it might have some shorted pads. You will have to skip those.

It might confuse some but the two jst ports can be viewed as one big one, all the wires are connected from right to left, starting from B-

 

[Mikebike]

Thank u eee291, making progress on this and feeling better about it.
I was also able to contact the seller and they were great and got me the English manual. I have posted a link below to the English manual for what I am calling the
ANT Protection board BMS 8s to 24s.
https://drive.google.com/file/d/1sql94GNH3AtWwd917gn5goxNLKm_RiSE/view?usp=drivesdk
Manual pretty much answers my wiring questions.
To help other novices like me in the future:
The reason there are 26 total JST pins for a Max 24s BMS is because:
The pins go from far RIGHT to far LEFT. The first negative starts on the far RIGHT, then go 24 left for each of your battery connections (making 25 pins so far). Then the last pin is another wire from your last plus connection on the last cell of the battery to the last pin (making 26pins). This last pin on far left is for power to the BMS. So your actual power for the BMS goes to the last pin on the leftmost JST connector therefore making 26 total pins correct.
So, it seems this BMS is able to accept a variable input power supply from your battery. From the minimum of 8s to the maximum of 24s cause the voltage you supply will be what the voltage is on your last plus on the last cell of your battery.
Couple other points just for documenting here:
Manual says it takes 18V minimum to get this BMS going. So u would need to apply 18V minimum to the last JST pin (far left pin) to get this BMS to turn on. Your negative would be on the first JST pin (the far right pin).
Also, the manual says it comes with an on/off switch. Awesome sauce!

 

[tmho]

I would also like to buy one for my new battery pack project.

Can the Bluetooth app show all the information that LCD display shows? If yes, then I would just use my cellphone as display. If no, what information will not be shown on the app?

 

[flippy]

I would also like to buy one for my new battery pack project.
Can the Bluetooth app show all the information that LCD display shows? If yes, then I would just use my cellphone as display. If no, what information will not be shown on the app?

battery percentage.

but it's useless anyway. it's off by miles.

 

[Dui ni shuo de dui]

battery percentage.

but it's useless anyway. it's off by miles.

Not that much, it is off by a few miles in the end, depending on how hard you ride, but it gives you a fair idea of what's left in the pack.
Last time I tried, mine was off by 7%, after a quite aggressive ride until full discharge. It would have been 100% accurate if one of the cells wasn't discharging a bit faster than the others in the very end (the BMS cut off whenever any cell reaches the low limit, so it doesn't matter if the other cells still have some remaining capacity, you simply lose it). The BMS cannot guess the actual shape of your cells, so you have to manually correct the values to get a more accurate/more realistic reading.
It is a bit tricky to get it right in the settings though. But I think it could be accurate to 2-4% or even better after some tinkering, I'd say that the higher you set the low limit, the more accurate it might get... At the expense of remaining capacity, so at the expense of a bit of your final range.