DKPeugeotION
Posts: 6
Joined: Fri Oct 25, 2019 10:15 am

Communicating directly with the BMS (reuse of battery-pack)

Wed Apr 01, 2020 3:25 pm

Hi

Unfortunately i had to say good bye to my Peugeot Ion, due to serious computer errors, and time pressure in general :)
But i salvaged the the battery, and would like to be able to use the cells in another project.

I would love to reuse the BMS, and I've been looking to find a way to communicate directly with the board on top of every battery pack.

They all end i a 8 pin connector, which i think is connected parallel to every battery pack. However i do not know the use of each pin, and have not been able to find it described in the Circuit diagrams in the workshop manual:
http://mmc-manuals.ru/manuals/i-miev/on ... 300ENG.HTM
Do anybody have more information about this BMS, and how to communicate with it?

There seems to be a private Can-bus for the batteries, but i do not know which pins it should be connected to?
And i guess i also need to supply a voltage, to power up the Can bus chip at the BMS.

The main chip (LTC 6802-2) on the BMS:
https://www.analog.com/media/en/technic ... 6802-2.pdf
-seems to be able to communicate through a SPI interface, so these connections might also be accessible though the connector?

kiev
Posts: 1120
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Communicating directly with the BMS (reuse of battery-pack)

Wed Apr 01, 2020 3:43 pm

Take a look at this thread: viewtopic.php?f=23&t=4302&hilit=CMU+board#p39002

Also schematics and the daisy chain wiring colors here:
https://www.diyelectriccar.com/forums/s ... ost1039087

then there is a fellow in the UK that has decoded all the BMU commands to all re-use in other application. Tom DeBree, i will try to find a good link or email to reach him.

His device is called Simp-BMS, he has info about it here:
https://www.diyelectriccar.com/forums/s ... p?t=198263
kiev = kenny's innovative electric vehicle

DKPeugeotION
Posts: 6
Joined: Fri Oct 25, 2019 10:15 am

Re: Communicating directly with the BMS (reuse of battery-pack)

Thu Apr 02, 2020 3:34 pm

Ok thanks for the info!
The connections in 8 pin connector must be like this:
pin 1: Can L
pin 2: not connected
pin 3: in?
pin 4: 12v
pin 5: Can H
pin 6: gnd
pin 7: out?
pin 8: not connected

So i guess i would be able hook up some power, and connect a can bus, but the next problem is to address and tell the BMS something that would give a meaning full response back, like the voltage of every cell :)
If i understand Simp-bms/Tom DeBree, he has found the commands and addresses of the Imiev BMS, and i guess that is what i would like to know as well :)
I might try to contact him, for more information.
It would be fun to know what the no. 3 and 7 pins were used for. Maybe a serial connection to processor, with special commands, like programming, and direct communication for initial or test purpose.

kiev
Posts: 1120
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Communicating directly with the BMS (reuse of battery-pack)

Thu Apr 02, 2020 5:30 pm

That is the daisy-chain between CMUs used for CMU numbering. The wiring colors were listed in one of the previous thread links of my previous post to you along with the board schematics.
kiev = kenny's innovative electric vehicle

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