CATL rose 13% in its Hong Kong trading debut on Tuesday morning after raising $4.6 billion in its IPO for European expansion.CATL, a major Tesla supplier, competes in the EV battery market with companies like Tesla and BYD.The IPO raised funds for a new battery plant in Hungary and ongoing business operations; CATL also has a partnership with Stellantis.CATL's new battery technology aims to out-charge competitors like BYD and Tesla, with a focus on fast-charging capabilities.