MG5 LR Battery

[yasko]

I'm sharing information about the MG5 LR battery I used in energy storage projects.

The 61kWh battery has a 96S1P configuration and uses giant 174Ah NMC cells from CATL.
The cells are arranged into six modules with two 8S groups.

Marking on the battery module:

Arrangement on the cell's group:

Each block has a BMS module:

Inside BMS module:

The BMS has two sections for monitoring each 8S cell. It's based on ADBMS6815, a new-generation BMS chip from ADI. It can monitor up to 12S cells.
Unfortunately, it is under NDA, and the full datasheet isn't available to the public. I think this chip is the successor to the popular LTC6811.

A picture of the primary BMS:

It uses LTC6820 for ISO-SPI communication with slave BMSs.
I was able to reuse the slave BMS modules; more on that in the following posts.

And finally, here is a picture of the battery without electronics and cables:

[marcexec]

Do you have dimensions of the modules so it can be added to https://openinverter.org/wiki/Batteries#OEM_modules?

[jamesn]

Hi Yasko,

Any updates on taking control of the slaves?

I've just bought and MG5 pack with only 800 miles on it so I was very happy to come across your post and get a first look inside what I've bought.

[yasko]

Hi Jamsen,

I have used the slave BMS modules and can help in this direction. But this will require some programming.
The ADBMS6815 is under NDA, which complicates the situation. Unfortunately, I cannot share the full datasheet.

My approach was to start with the code for LTC6811 and modify the code to work with ADBMS6815:
https://github.com/analogdevicesinc/Lin ... es/LTC6811
I'm using custom hardware based on STM32G491 MCU.

Also, I've searched the Github and found this:
https://github.com/526766987/Battery_Ma ... tem_36cell
It's based on STM32F407 + ADBMS6815 - I didn't test this, but it looks like a good starting point.

So, what hardware platform are you planning to use? You will need a LTC6820 for iso-spi communication.

@marcexec—I don't have the exact dimensions. Maybe Jamsen can help when he opens the battery.