I found a post supposedly written by a Chinese supplier of Northvolt. Not sure how true it is though so you need to find some insiders to validate the story. You will need some software to translate the picture into English/other languages.
Support is expensive getting good support from China is generally not possible, because it destroys margins. That is making me very curious about aftermarket of Chinese cars, because they might be cheapish today, but incredibly expensive when you will need to fix them.
https://imgur.com/AyQYtFj