Chinese firm's 620-mile solid-state EV battery beats extreme -22°F test

Dongfeng, a Chinese automotive firm, has developed a new solid-state battery with an energy density of 350 Wh/kg, capable of supporting electric vehicle (EV) driving ranges exceeding 620 miles on a single charge. The battery has demonstrated exceptional resilience, passing high-temperature tests at around 338°F and retaining approximately 72% of its energy capacity at extremely low temperatures down to -22°F. To further validate its performance, Dongfeng has conducted extensive winter testing at the Mohe Cold Region testing base near China’s northernmost border, focusing on driving range, charging efficiency, and durability under prolonged subzero conditions ranging from -40°F to -22°F. Dongfeng has established a comprehensive in-house development platform covering research, development, trial production, and pilot testing, through which it has achieved breakthroughs in over 10 core battery technologies and filed more than 180 invention patents. The company’s battery roadmap includes a range of energy density targets from 240 Wh/kg up to 500 Wh/kg