Battery: Volvo XC40 Polestar 2
Caution
Working with high voltage is dangerous. Always follow local laws and regulations regarding high voltage work. If you are unsure about the rules in your country, consult a licensed electrician for more information.
The following batteries are supported:
- 78kWh Volvo XC40 - Recharge, 2021-
- 78kWh Polestar 2 - Long range, 2020-
- Internal Contactors are not working. See https://github.com/dalathegreat/Battery-Emulator/issues/442#issuecomment-2336433533
- Can-Logs from working Polestar2: https://github.com/dalathegreat/Battery-Emulator/issues/442#issuecomment-2346737235
Connect HVIL2_EXT_IN and HVIL2_EXT_OUT together with a cable. (this will close the HVIL loop and make BECM a bit happier) The BECM has a built in 120ohm resistor. (BECM = Battery Energy Control Module)
Attached below are pictures of the BMS pinout. Connect the pins to the LilyGo and 12V supply like this:
- Pin 42 to LilyGo CAN - H
- Pin 43 to LilyGo CAN - L
- Pin 24 & 33 to +12V
- Pin 48 GND
To use the CAN contactors on Volvo XC40 and Plestar2, you need to connect the GND from the battery connector (PIN48) to the battery case. This GND is used for insulation monitoring. Without it, the battery will not be able to check the insulation integrity and will not engage contactors.
Incase your battery is missing some wires/disconnect switches, here are the OEM part numbers and purchase links. Do note that it might be cheaper to source from your local scrapyard!
| Product | Purchase Link |
|---|---|
| Service disconnect switch XXXXXX | XXXXXX |
| Low voltage 48pin connector | Aliexpress |
Make sure that the settings in the USER_SETTINGS.h file are correct. The line:
#define VOLVO_SPA_BATTERY
Needs to be uncommented for the software to interface correctly with the battery.
Next step is then to select the inverter protocol that you intend to use. After setting this up, press compile and upload to the board!
This feature was introduced in 8.1.0
Old implementation: When using PWM controlled contactors, the following parameters seem to work nicely with the Volvo contactors:
- Frequency 40000, Hold Duty 690
