<p>➀ Researchers from RWTH Aachen University analyzed the battery designs of Tesla and BYD, two major players in the EV market, by disassembling their batteries.</p><p>➁ The study found that Tesla's batteries prioritize high energy density and performance, whereas BYD's focus on space efficiency and lower-cost materials.</p><p>➂ Despite differences, both batteries share some similarities such as using laser welding for connecting thin electrode foils.</p>