Accessing Li Battery Bluetooth data

[BEngo]

Has anyond tried to obtain battery data in reuseable format over bluetooth using the bluetooth module in a "drop-in" LiFePO4 and anoyher bluetooth module?

 

It seems to me that the BMS phone app can read quite a lif of 'stuff', so this should be available to something  like an arduino/pi module.  One could then get the MCU to use this to do things like shut off charge sources based on SOC, cell voltage current etc.

 

N

[nicknorman]

20 minutes ago, BEngo said:

Has anyond tried to obtain battery data in reuseable format over bluetooth using the bluetooth module in a "drop-in" LiFePO4 and anoyher bluetooth module?

 

It seems to me that the BMS phone app can read quite a lif of 'stuff', so this should be available to something  like an arduino/pi module.  One could then get the MCU to use this to do things like shut off charge sources based on SOC, cell voltage current etc.

 

N

Not done it but I have been tinkering with a BLE (Bluetooth Low Energy) module recently. Less than £3 from Aliexpress IIRC. It will certainly connect to a Bluetooth module in a Li battery BMS. However it is just serial data ie a bunch of numbers, and as far as I know there is no industry standard protocol. I suppose the BMS manufacturer might make the protocol available, but failing that one would have to reverse engineer it and that would be time consuming. It’s what I did with Masterbus but it took a while, and then I only reverse engineered just enough to meet my needs.

Edit: ah well there you go, the power of Google. Looks like someone has done it!

 

https://endless-sphere.com/sphere/threads/generic-chinese-bluetooth-bms-communication-protocol.91672/

[matty40s]

35 minutes ago, nicknorman said:

 

Edit: ah well there you go, the power of Google. Looks like someone has done it!

 

https://endless-sphere.com/sphere/threads/generic-chinese-bluetooth-bms-communication-protocol.91672/

Oh bloomin heck, that's another bookmark added to my reading list....

[BEngo]

Thank you  Nick.

 

  I did spend half an hour Googling, but my Google fu is clearly not up with yours today.

 

 N

[BEngo]

23 hours ago, nicknorman said:

Not done it but I have been tinkering with a BLE (Bluetooth Low Energy) module recently. Less than £3 from Aliexpress IIRC. 

You may find this useful

 

https://github.com/neilsheps/overkill-xiaoxiang-jbd-bms-ble-reader

 

 

 N

[nicknorman]

54 minutes ago, BEngo said:

You may find this useful

 

https://github.com/neilsheps/overkill-xiaoxiang-jbd-bms-ble-reader

 

 

 N

 

Thanks. However it's not something I was planning to do - my tinkering with the BLE module was for a different project unrelated to boating, and anyway our own boat Li batteries have my homebrewed BMS without bluetooth - although of course the BMV712 bluetooth gives me overall sight of the battery state.