I agree with you that a lot of the new entrants have unknown history, but you can't say that about the big boys BYD, Geely, SAIC/MG, Changan. These are all huge, well-established companies.
I hear nothing of Chinese EV's with faulty batteries. I hear of thousands of abandoned Chinese EV's because the owners (rental companies etc) went bust, but faulty batteries is almost unheard of with Chinese EV's.