The report claims that Apple had initially wanted to work with Chinese companies like CATL and BYD, but one of Apple’s requirements was that these batteries be made in the US, which meant that neither of these companies would be possible. Instead, the report claims that Apple might work with Taiwan’s Foxconn or Advanced Lithium Electrochemistry, both of whom have plans to set up shop in the US.
For the most part, Apple sources their parts and components from many places around the world, but the majority does come from China, including the manufacturing and assembling processes. Apple has explored making certain products in the US, like with Mac Pro which is assembled in the US.
At the moment there is no word on when Apple’s rumored electric car will make its official debut. So far Apple hasn’t really commented too much on it, but the company has made a series of hires over the years for people coming from electric car and automotive backgrounds, so clearly they are up to something.