Dongfeng Automobile has officially dispatched test vehicles equipped with their new 350Wh/kg solid-state batteries for extreme cold weather testing. According to an announcement made by Yipai Technology yesterday, the test fleet departed from Wuhan for the Mohe Cold Region (which is in the northernmost part of China) testing base, where the vehicles will undergo rigorous winter calibration testing.
The 350Wh/kg solid-state battery represents Dongfeng’s latest achievement in battery technology development. According to official information, these batteries can support vehicle ranges exceeding 1,000 kilometers on a single charge. Even more impressive is their performance in extreme conditions—the batteries have passed stringent 170°C heat box tests and maintain 72% energy retention rates at temperatures as low as -30°C.
The current testing program focuses on three core dimensions: low-temperature range, low-temperature charging capability, and low-temperature durability. More than 70 different tests will be conducted in extreme environments ranging from -40°C to -30°C to systematically evaluate battery performance metrics, including range stability, charging and discharging efficiency, structural safety, and overall vehicle integration.
Dongfeng has built a comprehensive self-developed platform covering the entire “R&D-trial production-pilot testing” process. The company has reportedly overcome more than 10 key core technologies and applied for over 180 invention patents in this field. Their battery development roadmap includes products ranging from 240Wh/kg to 500Wh/kg energy density.
At the 2025 World Power Battery Conference held in Yibin, Sichuan, from November 12-15, Dongfeng showcased its next-generation solid-state battery products alongside several new energy vehicle models from their independent brands. The company revealed they have already built and commissioned a 0.2GWh solid-state battery pilot production line, with plans to begin mass production of the 350Wh/kg solid-state batteries for vehicle installation by September 2026. The charging rate for these batteries is 1C, according to information disclosed by Dongfeng representatives at the conference.
According to Chinese media Hubei Daily, the solid-state batteries exhibited by Dongfeng utilize high-capacity ternary cathodes, silicon-carbon anodes, and oxide-polymer composite solid-state electrolyte systems. This configuration addresses the safety and low-temperature performance shortcomings of traditional lithium batteries. The thermal stability tests at 170°C exceed the national standard requirement of 130°C, demonstrating exceptional safety performance.
Recent breakthroughs by Chinese research teams have helped overcome key technical barriers in solid-state battery development, including interfaces between solid electrolytes and electrode materials. These advances include innovations from the Institute of Physics of the Chinese Academy of Sciences, which developed iodine ion additives that fill microscopic gaps, and the Institute of Metals’ creation of polymer frameworks that enhance flexibility. Additionally, Tsinghua University researchers have improved high-pressure resistance through fluorine-containing polyether materials that strengthen the electrolyte.
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