Jakob N's Cell Change Thread

[MickeyS70]

I had the idea to have the car running with the heater on, until it shuts down.

Yes, that’s the easiest way to use the battery function in Hobdrive as the battery voltage needs to be below a certain level (can’t remember what exactly).

 

[Jakob N]

Yeah, I think that this is the Problem on my car.
Calculated SOC is not alligning with the cells voltage.
So I tried to get the car as empty as possible, but a low SOC might not be enough for the procedure to start.
Can I damage Something, like the car not accepting charging anymore when i let the heater run until it is empty and shuts down?

I will take a Screenshot of the voltages as soon as I get home from work tomorrow.
today it was at 51,8% an I wanted to try a second trip to work.i plugged the car in for literally two minutes, and now it is sitting at 71%.
I think the BMS is confused because the cells do not work as they used to.
Voltages are now at 4,012V and 0,01V difference

 

[MickeyS70]

Can I damage Something, like the car not accepting charging anymore when i let the heater run until it is empty and shuts down?

No, the low voltage protection will keep the cells in the ‘green’

I think the BMS is confused because the cells do not work as they used to.
Voltages are now at 4,012V and 0,01V difference

Correct, the BMU calculates with the old battery’s capacity which doesn’t match the new one’s voltage levels

 

[Jakob N]

I made two boards for mounting the AD202KY
One mounts horizontally to the existing holes on the main PCB, the other one is mounted vertically, and will need so glue for preventing damage due to vibrations.
As my inverter is already running in the car again I can not test it now, but maybe someone will find this usefull in the future.
PCBs were drawn in eagle (Fusion electronics) If needed I can export the Gerber- files.

On the vertical version 90 degree angled pinheaders need to be used;
Alternatively standard- pinheaders can be soldered to the board like SMD- parts.



On the horizontal PCB special care needs to be taken that the pins of the AD202 don't cause a short- circuit on the Main PCB, as the replacement board is bigger than the original ISA- board!



As I have not tested the boards the manufacturing and usage of these boards is done on ones own responisbility!
Only attempt this repair if you know what you are doing!

BR

 

[hjdlsnbc]

Awesome! This is the sort of content i would love to see all over this forum!
You have also put it as a backup on github and made PR possible?

 

[Jakob N]

Not yet; I don't have a github account; But I can do this too, so it will not be lost for those who need the files.