Chinese automaker Dongfeng Automobile has dispatched test vehicles equipped with its 350Wh/kg solid-state batteries to undergo extreme cold weather trials.
After leaving Dongfeng ’s facilities in central China, the test fleet set out on a long northbound journey to the Mohe Cold Region testing base, located near China’s northernmost border. There, the vehicles will be subjected to intensive winter calibration programs designed to evaluate performance, durability, and system stability in prolonged subzero conditions.
At the core of these trials is Dongfeng’s new 350 Wh/kg solid-state battery, marking a significant milestone in the company’s battery development roadmap. According to official data, the technology is capable of supporting driving ranges of more than 620 miles on a single charge. The batteries have also demonstrated strong resilience under extreme stress, passing high-temperature box tests at roughly 338°F and retaining around 72 percent of their energy capacity at temperatures as low as -22°F.Solid-state battery reliability in deep-freeze conditionsThe latest phase of testing shifts the focus to how the vehicles perform in sustained deep-freeze conditions, with particular attention on real-world usability. Engineers are evaluating three key areas: driving range at low temperatures, charging performance in cold weather, and long-term durability under repeated thermal stress. The program includes more than 70 individual tests carried out in environments ranging from approximately -40°F to -22°F. These trials are designed to systematically measure critical performance indicators, including range consistency, charging and discharging efficiency, structural and thermal safety, and how effectively the battery system integrates with the vehicle as a whole under extreme winter conditions.As part of its broader push into next-generation energy storage, Dongfeng has established a fully in-house development platform that spans the entire cycle from research and development to trial production and pilot testing, CarNewsChina reported.Through this process, the company has reportedly broken through more than 10 critical core technologies and filed over 180 invention patent applications related to advanced battery systems. Dongfeng’s battery roadmap also outlines a wide spectrum of energy-density targets, with planned products ranging from 240 Wh/kg to as high as 500 Wh/kg.Moving closer to mass production of solid-state batteries At the end of last year, Dongfeng highlighted its next wave of solid-state battery technology alongside several new energy vehicle models from its in-house brands. The company disclosed that it has already constructed and brought online a solid-state battery pilot production line with an annual capacity of 0.2 GWh, equivalent to roughly 200 MWh. According to Dongfeng, this facility will serve as the bridge toward full-scale manufacturing, with mass production of its 350 Wh/kg solid-state batteries for vehicle integration targeted for September 2026. Company representatives also confirmed that the batteries are designed to support a 1C charging rate, positioning them for practical, real-world EV use rather than laboratory-only demonstrations.Reports in Chinese media indicate that the batteries have undergone thermal stability testing at temperatures of around 338°F, exceeding the national standard threshold of approximately 266°F. While these results come from company disclosures and domestic coverage, they point to a focus on higher thermal tolerance and more predictable behavior under stress as the technology moves through further validation stages.
Dongfeng Energy &Amp Environment EV Battery Solid-State Solid-State Batteries
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