BYD, a major Chinese automaker, has set a target date of 2027 for the introduction of a solid-state battery, according to an interview with Stella Li, the company's executive vice president, conducted by the Spanish website Carwow.es in mid-September. While the company has not yet named a specific vehicle model or provided details on production volume or timing within the year, the announcement leaves uncertainty as to whether the vehicle will be a commercial offering or a technological demonstration. Solid-state batteries are a type of next-generation battery technology that uses a solid electrolyte instead of a liquid one, promising greater safety and efficiency. According to sources from CarNewsChina, the future flagship sedan of the luxury brand Yangwang, which is part of BYD, may be the first to feature this technology. However, BYD has not officially confirmed this. The timeline aligns with earlier comments from Sun Huajun, technical director of FinDreams Battery, a subsidiary of BYD, who mentioned initial demonstration installations around 2027 and mass production around 2030 in February 2025. In February 2026, BYD's investor relations department noted progress in battery longevity and fast charging, with small series expected in 2027. BYD is focusing on a solid electrolyte based on sulfides, which is considered more conductive, stable, and less flammable than traditional lithium-ion battery liquids. However, the high cost of sulfur precursors, which can be dozens of times more expensive than conventional materials, may limit the initial deployment of this technology to premium models. Lian Yubo, chief scientist of the group, indicated that solid-state batteries will be reserved for high-end models, while lithium-iron-phosphate (LFP) batteries will continue to be used in the majority of the company's product range. LFP batteries are a type of lithium-ion battery known for their lower cost and longer lifespan. Other automakers are also working on solid-state battery technology, with Toyota and SAIC targeting 2027 or 2028, and Geely planning to deploy a thousand demonstration vehicles as early as next year across its brands, including Volvo, Polestar, Zeekr, and others. This growing interest in solid-state batteries reflects the industry's push for safer, more efficient, and longer-lasting energy storage solutions for electric vehicles.