bluetooth BMS?

Batteries, Chargers, and Battery Management Systems.
e3s   1 mW

1 mW
Posts: 12
Joined: Jan 08 2018 12:40pm

Re: bluetooth BMS?

Post by e3s » May 04 2018 3:21pm

thank you, now it's clear.

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

7S modular smart BMS

Post by ElectricGod » May 07 2018 12:59pm

I have received 5 boards on saturday, but done nothing with them so far. This is just a quicky update for parties that would be interested.

Looking the boards over, the mosfets are probably SOT428 or TO252 packages. They are already smallish for any amount of current handling that I'm likely to ever use. THen you get to this awesome picture they sent me. Notice how none of the C-, P- or B- connections are used to interconnect the boards. It's just a balance board at this point. And that's 100% fine with me. All I want for LTO is a balancing board anyway. If you can read that squiggly stuff, please post a translation!

Image

Feature number 3 says "balance the current 60mA-1.2A". Looking at the tiny shunt resistors and mosfets on the board, this is pretty laughable. No way is 1.2 amps possible except for maybe .1 seconds before something burned out. I'd believe 120mA, but NOT 1.2A.

I need to get 7S balance cables for it. They got lost somewhere. OH well...not very expensive and I don't have any since no battery pack I've ever run across is 7S. Otherwise, this is what I got.

Image

On a final note...
Feature number seven says this "Subsequent expansion of feature boards, such as the Bluetooth interface board, APP mobile software can be obtained from the store." I got an APK for the boards and I have BT modules from my 16/20S smart BMS's. I'll be plugging in a BT module and loading up the app on my phone. Who knows...it might work!

Sorry for the craptastic pictures, better ones to come soon.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
Inwo   10 kW

10 kW
Posts: 585
Joined: Dec 13 2016 12:01pm
Location: SE MN. USA

Re: bluetooth BMS?

Post by Inwo » May 07 2018 10:36pm

Sorry about that. The balance leads are only 6" long. Will yours come before i can send them?

The description may cover future iterations. Larger balance current, add on Mosfets boards, etc.
It would be nice if they copied the bt and sw smart bms use.
Keep us updated.
Mike might want a 33s model if it works. Mosfets rating no issue for him, as he has an enable wire on his charger.

patrickza   1 kW

1 kW
Posts: 465
Joined: Jul 06 2008 2:34pm

Re: bluetooth BMS?

Post by patrickza » May 08 2018 9:04am

Phew, I've gone through all 18 pages of this thread today to make sure this is the BMS I should order. My bike is 24s 10AH lifepo4 powered, and I never run more than 65A peak or 25A continuous. I'm looking forward to be able to check how charging is going without having to go outside this (southern hemisphere) winter :)

So with that in mind, will the 70A version be good enough, or will the 150A version offer better reliability?
Greyb.org, Cromotor, Headway 83.2v 20AH, Lyen 18 fet: http://endless-sphere.com/forums/viewto ... =3&t=45514
Kona Kahuna, x5305, Headway 76.8v 10AH, Crystalyte 72v48A: http://endless-sphere.com/forums/viewto ... =3&t=10256
Bladez Scoot, 450W motor putting out 3kW, Headway 38.4v 10AH, Lyen special controller: http://endless-sphere.com/forums/viewto ... 35&t=25872

User avatar
Inwo   10 kW

10 kW
Posts: 585
Joined: Dec 13 2016 12:01pm
Location: SE MN. USA

Re: bluetooth BMS?

Post by Inwo » May 08 2018 11:29am

English manul.doc
(1.74 MiB) Downloaded 114 times

User avatar
Inwo   10 kW

10 kW
Posts: 585
Joined: Dec 13 2016 12:01pm
Location: SE MN. USA

Re: bluetooth BMS?

Post by Inwo » May 08 2018 11:30am

7S保护板说明书.doc
(1.2 MiB) Downloaded 21 times

User avatar
made_in_the_alps_legacy   10 kW

10 kW
Posts: 702
Joined: Nov 14 2013 1:44am
Location: the alps - near italy, france, switzerland

Re: bluetooth BMS?

Post by made_in_the_alps_legacy » May 08 2018 3:02pm

ElectricGod wrote:
May 02 2018 10:08pm
I am moved into my new house and found my box of batteries. I had no problem connecting to the BMS on my 16,000mah 16S LIPO pack. My phone connected immediately. My guess is the BT module was either fully awake or in some kind of low power receive only mode.
I wired up the 18s version of "BMS battery" smart BMS. when I try to connect with the android application from their website, it does not remain connected and a message "connection refused by xiaoxiang BMS" shortly sowes up. I tried the "smart BMS" application and the behavior is the same : it does not remain connected.

did u figure out how did u woken up ur BT module ?

EDIT : 4hours later and 3 different applications attempts, I got success with the one of the link below :
https://www.lithiumbatterypcb.com/smart ... -download/
NOTE : some explanations given (such as BT module behavior, ...) w. the link above
looks nice...

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 09 2018 7:03pm

patrickza wrote:
May 08 2018 9:04am
Phew, I've gone through all 18 pages of this thread today to make sure this is the BMS I should order. My bike is 24s 10AH lifepo4 powered, and I never run more than 65A peak or 25A continuous. I'm looking forward to be able to check how charging is going without having to go outside this (southern hemisphere) winter :)

So with that in mind, will the 70A version be good enough, or will the 150A version offer better reliability?
The BMS won't be physically larger by going to 150 amps vs 70A. All that's different is the number of mosfets. Considering the cost difference and my general point of view that more is always better, I'd personally buy the 150 amp version. I'm pretty happy with this BMS, but haven't really tested them a lot yet. Moving killed all EV activity for a good while!
Last edited by ElectricGod on May 09 2018 7:09pm, edited 1 time in total.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 09 2018 7:06pm

made_in_the_alps_legacy wrote:
May 08 2018 3:02pm
ElectricGod wrote:
May 02 2018 10:08pm
I am moved into my new house and found my box of batteries. I had no problem connecting to the BMS on my 16,000mah 16S LIPO pack. My phone connected immediately. My guess is the BT module was either fully awake or in some kind of low power receive only mode.
I wired up the 18s version of "BMS battery" smart BMS. when I try to connect with the android application from their website, it does not remain connected and a message "connection refused by xiaoxiang BMS" shortly sowes up. I tried the "smart BMS" application and the behavior is the same : it does not remain connected.

did u figure out how did u woken up ur BT module ?

EDIT : 4hours later and 3 different applications attempts, I got success with the one of the link below :
https://www.lithiumbatterypcb.com/smart ... -download/
NOTE : some explanations given (such as BT module behavior, ...) w. the link above
looks nice...
Never had this problem with the correct app. I posted some ways back pictures of the app I use. I tried the other apps and could not get them to work. Maybe that's what you've been trying too...aka the wrong apps.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 09 2018 7:07pm

Inwo wrote:
May 08 2018 11:29am
English manul.doc
Thanks for posting this doc, but a little bit of description would be nice.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

patrickza   1 kW

1 kW
Posts: 465
Joined: Jul 06 2008 2:34pm

Re: bluetooth BMS?

Post by patrickza » May 10 2018 3:26am

One more question, is the screen useful or can everything be displayed on an android phone? I'm particularly thinking of the need to track down a weak cell, can I view all cell voltages simultaneously on a phone?
Greyb.org, Cromotor, Headway 83.2v 20AH, Lyen 18 fet: http://endless-sphere.com/forums/viewto ... =3&t=45514
Kona Kahuna, x5305, Headway 76.8v 10AH, Crystalyte 72v48A: http://endless-sphere.com/forums/viewto ... =3&t=10256
Bladez Scoot, 450W motor putting out 3kW, Headway 38.4v 10AH, Lyen special controller: http://endless-sphere.com/forums/viewto ... 35&t=25872

User avatar
flippy   10 kW

10 kW
Posts: 851
Joined: Aug 12 2015 3:07pm

Re: bluetooth BMS?

Post by flippy » May 10 2018 5:27am

Image

Brand new pack (50Ah) first charge.

So no, you dont need the lcd, but it is much more practical then using the app
Lithium beats liquid dinosaurs.

patrickza   1 kW

1 kW
Posts: 465
Joined: Jul 06 2008 2:34pm

Re: bluetooth BMS?

Post by patrickza » May 10 2018 5:44am

Thanks for that flippy, looks like I won't need the screen afterall!
Greyb.org, Cromotor, Headway 83.2v 20AH, Lyen 18 fet: http://endless-sphere.com/forums/viewto ... =3&t=45514
Kona Kahuna, x5305, Headway 76.8v 10AH, Crystalyte 72v48A: http://endless-sphere.com/forums/viewto ... =3&t=10256
Bladez Scoot, 450W motor putting out 3kW, Headway 38.4v 10AH, Lyen special controller: http://endless-sphere.com/forums/viewto ... 35&t=25872

cwah   10 GW

10 GW
Posts: 4130
Joined: Jul 24 2011 5:42am
Location: Between paris and london

Re: bluetooth BMS?

Post by cwah » May 10 2018 6:35am

flippy wrote:
May 10 2018 5:27am
Image

Brand new pack (50Ah) first charge.

So no, you dont need the lcd, but it is much more practical then using the app
Which BMS is this?
Help me find my stolen electric brompton: http://bit.ly/1a0vbBC and Bosch Sinus B3 http://bit.ly/1eV0WQz

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 10 2018 9:19am

patrickza wrote:
May 10 2018 5:44am
Thanks for that flippy, looks like I won't need the screen afterall!
I got the LCD for all 3 of this style of BMS that I have. Mount it someplace meaningful and you don't need your phone except for when you want to make a change or want more detailed information. If you are using your phone all the time, then yes, it is a superior interface, but for quick checks of status, the LCD is super convenient. I recommend getting one and then deciding if you really want to live without it.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 10 2018 9:33am

cwah wrote:
May 10 2018 6:35am
flippy wrote:
May 10 2018 5:27am
Image

Brand new pack (50Ah) first charge.

So no, you dont need the lcd, but it is much more practical then using the app
Which BMS is this?
These...

https://www.aliexpress.com/store/produc ... 3de2laE1VG

https://www.aliexpress.com/store/produc ... 3de2laE1VG

There's lots of sellers on aliexpress that sell this BMS. I know of several people and myself that buy from IC GOGOGO specifically. They do a good job and don't mess around like a lot of Chinese sellers do. Buying experience is never perfect with the Chinese, but IC GOGOGO is better than most. I'll buy from them again.


I'm about to place an order for 4 20S smart BMS. If anyone wants one or anything else from IC GOGOGO, go look at what they have and then PM me. You can paypal me money and I'll add what you want to my order. Don't bother if you are NOT in the USA.

This is the BMS I'm ordering. They have been discussed in this thread a lot.

https://www.aliexpress.com/store/produc ... 3de2aYQcmU
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

16-20S smart BMS upgrade

Post by ElectricGod » May 11 2018 3:13am

Replaced P- mosfets, replaced shunts, upgraded copper busses and added 5.5mm bullets for B- and P- connections.

Image

Image

Original vs upgraded shunts.

Image
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

7S modular BMS

Post by ElectricGod » May 11 2018 3:17am

Some better pics...still haven't had a chance to play with them yet. 7S balance cables arrived...so this weekend hopefully.

Image

Image

Image

Image
Last edited by ElectricGod on May 11 2018 9:43am, edited 1 time in total.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
flippy   10 kW

10 kW
Posts: 851
Joined: Aug 12 2015 3:07pm

Re: bluetooth BMS?

Post by flippy » May 11 2018 6:30am

are those EC5 plugs? what is your limit for using those? (in amps)
i see they start getting melty around 40+ amps.
Lithium beats liquid dinosaurs.

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 11 2018 9:45am

flippy wrote:
May 11 2018 6:30am
are those EC5 plugs? what is your limit for using those? (in amps)
i see they start getting melty around 40+ amps.
If you are asking me a question, then both those BMS have JST connectors on them.

5.5mm bullet connectors are good for 150 amps.
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
Dui, ni shuo de dui   100 W

100 W
Posts: 118
Joined: Jan 29 2016 3:21am

Re: bluetooth BMS?

Post by Dui, ni shuo de dui » May 14 2018 10:03pm

Very, very interesting thread.

Actually, I just bought one of those BMS 2 days ago, without even knowing they were already discussed here. Pretty happy to see that apparently that wasn't too bad of a choice.

I've purchased the 300A model, for my LiFePO4 23S 2P (72V 40AH) A123 pouch cells battery pack.
This one:
https://item.taobao.com/item.htm?spm=a2 ... t=6#detail

I think the wiring and configuration should be pretty straight forward, but there is only one thing that I'm not sure of yet:

My plan is to use two of these batteries in parrallel, for a total of 80AH. So I'll need 2 of these BMS in the end. The thing I'm worrying about is the bluetooth: will it work fine if I have two BMS working at the same time? Is the app able to switch from one BMS to another? Can I change the bluetooth device name in order to know which BMS is which? Also, is is possible to change the password for something slightly more secure than 1234?

Any relevant information regarding this particular matter would be greatly appreciated.

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 15 2018 10:08am

Dui, ni shuo de dui wrote:
May 14 2018 10:03pm
Very, very interesting thread.

Actually, I just bought one of those BMS 2 days ago, without even knowing they were already discussed here. Pretty happy to see that apparently that wasn't too bad of a choice.

I've purchased the 300A model, for my LiFePO4 23S 2P (72V 40AH) A123 pouch cells battery pack.
This one:
https://item.taobao.com/item.htm?spm=a2 ... t=6#detail

I think the wiring and configuration should be pretty straight forward, but there is only one thing that I'm not sure of yet:

My plan is to use two of these batteries in parrallel, for a total of 80AH. So I'll need 2 of these BMS in the end. The thing I'm worrying about is the bluetooth: will it work fine if I have two BMS working at the same time? Is the app able to switch from one BMS to another? Can I change the bluetooth device name in order to know which BMS is which? Also, is is possible to change the password for something slightly more secure than 1234?

Any relevant information regarding this particular matter would be greatly appreciated.
Why do you think you need 2 BMS? What's your max current draw? If it's less than 300 amps, then 1 BMS will work. If I'm running LIPO. I like to have each string of packs on their own BMS if I'm using dumb BMS. With smart BMS, I no longer care as much. There's no reason why you can't run from a single BMS if you are running at less than 300 amps. Since you are running LIFE (meh), I see no reason for dual BMS.

I have probably 10 smart BMS. The little 16-20 smart BMS talked about here so much don''t let you name them. My best option is to record the MAC addresses for all of them and that's how I keep track of which one is which. I also label the BMS with the MAC address. For these better 24 and 32S BMS, that's not a problem...name them as you see fit. REgardless of BMS type, connecting and disconnecting from one to connect to another is straight forward and easy. The 16-20S BMS don't even need a password to connect...talk about NOT secure!

There's an option in the phone app that lets you name the BMS something meaningful to you...such as BMS1 o24S100AH. The default name is BMS-ANT. The "Modify BT ADDR" is the option for this. And yes to changing the password.

Image
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
Dui, ni shuo de dui   100 W

100 W
Posts: 118
Joined: Jan 29 2016 3:21am

Re: bluetooth BMS?

Post by Dui, ni shuo de dui » May 15 2018 8:41pm

ElectricGod wrote:
May 15 2018 10:08am
Why do you think you need 2 BMS? What's your max current draw? If it's less than 300 amps, then 1 BMS will work. If I'm running LIPO. I like to have each string of packs on their own BMS if I'm using dumb BMS. With smart BMS, I no longer care as much. There's no reason why you can't run from a single BMS if you are running at less than 300 amps. Since you are running LIFE (meh), I see no reason for dual BMS.
Mainly for two reasons:
1-I'll have two battery blocks, which I may swap from time to time depending on what I'll want to do (lighten the bike, go for long range, go for 144V instead of 72, etc.) This gives me flexibility.
2-I plan to change my controller soon for at least 5-600Amps (battery continuous current), if I manage to find a good one.
Right now with the sabvoton one BMS is enough, but I'd like to leave as much room as I can for a better setup in a near future.
I actually see no reason for not having 2 BMS, it's not like those things are super heavy or expensive.
ElectricGod wrote:
May 15 2018 10:08am
For these better 24 and 32S BMS, that's not a problem...name them as you see fit. REgardless of BMS type, connecting and disconnecting from one to connect to another is straight forward and easy. The 16-20S BMS don't even need a password to connect...talk about NOT secure!

There's an option in the phone app that lets you name the BMS something meaningful to you...such as BMS1 o24S100AH. The default name is BMS-ANT. The "Modify BT ADDR" is the option for this. And yes to changing the password.
Great, thanks for the info!

User avatar
ElectricGod   10 MW

10 MW
Posts: 2205
Joined: Nov 01 2015 5:24pm
Location: 3 OH 3

Re: bluetooth BMS?

Post by ElectricGod » May 21 2018 3:01pm

Dui, ni shuo de dui wrote:
May 15 2018 8:41pm
ElectricGod wrote:
May 15 2018 10:08am
Why do you think you need 2 BMS? What's your max current draw? If it's less than 300 amps, then 1 BMS will work. If I'm running LIPO. I like to have each string of packs on their own BMS if I'm using dumb BMS. With smart BMS, I no longer care as much. There's no reason why you can't run from a single BMS if you are running at less than 300 amps. Since you are running LIFE (meh), I see no reason for dual BMS.
Mainly for two reasons:
1-I'll have two battery blocks, which I may swap from time to time depending on what I'll want to do (lighten the bike, go for long range, go for 144V instead of 72, etc.) This gives me flexibility.
2-I plan to change my controller soon for at least 5-600Amps (battery continuous current), if I manage to find a good one.
Right now with the sabvoton one BMS is enough, but I'd like to leave as much room as I can for a better setup in a near future.
I actually see no reason for not having 2 BMS, it's not like those things are super heavy or expensive.
ElectricGod wrote:
May 15 2018 10:08am
For these better 24 and 32S BMS, that's not a problem...name them as you see fit. REgardless of BMS type, connecting and disconnecting from one to connect to another is straight forward and easy. The 16-20S BMS don't even need a password to connect...talk about NOT secure!

There's an option in the phone app that lets you name the BMS something meaningful to you...such as BMS1 o24S100AH. The default name is BMS-ANT. The "Modify BT ADDR" is the option for this. And yes to changing the password.
Great, thanks for the info!
I haven't done this...maybe someday soon...but get a blue tooth terminal app for your phone. It's just a bunch of AT commands like back in old RSR232 modem days, but the BT name can be changed on any BT module to whatever you want. I don't know what BT module any of these modules use, but this is for the HC05/06 modules. The AT commands will be the same most likely.

http://www.instructables.com/id/AT-comm ... th-module/
ElectricGod...it's a joke...don't take things so seriously folks!

XB-502 Moped:
https://endless-sphere.com/forums/viewt ... 0#p1222730

Currie scooter:
https://endless-sphere.com/forums/viewt ... 7#p1227407

User avatar
made_in_the_alps_legacy   10 kW

10 kW
Posts: 702
Joined: Nov 14 2013 1:44am
Location: the alps - near italy, france, switzerland

Re: bluetooth BMS?

Post by made_in_the_alps_legacy » May 21 2018 3:17pm

after 3 battery cycles of satisfaction, the BMS does not accept load anymore:
it powers off as soon as load is applied and an "IC front-end error" appears in the event log...
does anyone knows what that is ?

Post Reply