[Alan3114]

Hi everyone. I have started to hack a 2015 golf gte battery ( part number 5Q0915590K ) to use in a classic car conversion ( lexus gs450h drive/ modified lexus rx450h inverter )
I am currently using an arduino board to read the internal Canbus signals . I can currently read current in/out of battery back and have just about worked out how to read the individual 96 cell voltages 🙂
Does anyone have any information on how to control the contractors via the Canbus ?
If anyone else is working with this battery and wants to share info please get in touch
Alan

 

[Alan3114]

Thanks for your link thats been really helpful. I am in the early stages of working it at the moment. I do know that the current can be measured from Can Id 0xbb. It is sent 100 times a second and bytes 1 & 2 have the current . It measures + or - and upto about + - 200 Amps . Value seems to be Amps × 160

I will post more when/if I can control the contactors via CAN. I think it should ( from looking at the circuit ) be able to read the overall voltages on contactors and precharge and maybe even resistances to chassis

 

[Alan3114]

Hi, sorry for the huge delay replying
I am back onto this project again.
I have upgraded now to an STM32 for this part of the project and have just built a board with an LCD and connects to the internal CAN of the battery so it shows me all cell voltages and current in/out
If you want any information let me know. I will respond quicker now

 

[Alan3114]

Well I am sure it can be dismantled, I think I will have to do the same as I have a bit too much weight at the back. And none at the front.
The only hazard I can see is how to do it safely as the whole thing is live ! Also I am not sure how the water cooling is done/connected . I hopefully won't need to use the water cooling so will just monitor the cell temperatures .

 

[Alan3114]

Hi Golfdubcrazy.
Some where I have a copy of what I have worked on the pins to be. There are 2 lots of canbus on the external plug
1 is the normal golf drivetrain canbus
2nd is the HV canbus
These go inside to a control circuit. This then had a 3rd Canbus which goes to batteries and the HV contactor control board. If you look above in the thread there is information on how to read the cell voltages ( only from internal CAN )
You can also read current in/Out via the internal CAN. I am currently working on control of the contactor , but I will only doing it from the internal CAN . I am not sure which or how some of the internal CAN gets accessed from the outside plug. So I would just take the lid of and measure CAREFULLY the battery voltages.
If you do want to try and access via the external plug let me know and I'll look up what I have. Also if you need a plug for it , it is almost identical to a VW headlamp plug
Alan

 

[Alan3114]

I am struggling to upload photos as on my phone. Lol
Send me you email ( by private message ) and I will send you what info I have

 

[Alan3114]

When I got my battery I tried with Vagcom but couldn't get any communication:-( . From what I have read since I don't think you can connect to it with out using a CAN gateway , as the gateway has to assign the CAN id between the diagnostic tool and whatever you are talking to . I read this in a VW SSP.

I have made my control circuit now directly control the contactors and it monitors the output voltage so it will detect a short circuit while in the pre-charge and it will also detect a short from either battery wire to chassis and so safely turns the battery off