China holds a leading position in solid-state battery patent filings, yet industry observers warn the country may lose its global edge as other regions intensify support through policy measures, industrial coordination, and intellectual property deployment. An industry and policy analysis published this year describes all-solid-state batteries as a strategic technology moving into a critical industrialization phase.
As of late 2025, global solid-state battery patents totalled 16,429 across 6,321 unique patent families. China accounted for roughly 35% of these filings, with electrolyte-related patents representing about 39% of worldwide submissions. Japan remained the largest single contributor by nation, responsible for approximately 37% of global patent filings, compared to China’s near-30% share. Other significant contributors included the United States and South Korea.
China’s annual research output in this field rose sharply from 21 papers in 2015 to 562 in 2023, the highest volume worldwide. Key advances in solid-solid interface engineering—a core challenge in commercialization—are credited to institutions such as the Chinese Academy of Sciences, its Institute of Metal Research, and Tsinghua University.
Despite China’s overall volume, corporate patent concentration remains uneven. Among the top 30 patent-holding institutions, Japanese companies occupy 17 positions, Chinese firms hold seven, South Korean firms five, and European organizations one. Toyota leads corporate holdings with about 40% of global solid-state battery patents. Major Chinese enterprises, including CATL, BYD and SVOLT, collectively filed more than 500 patent applications in 2023.
Industry participants are transitioning from pilot-scale development to small-batch production, with early manufacturing anticipated around 2027 and broader commercialization targeted for 2030. Notable prototypes unveiled by Chinese researchers include a 451.5 Wh/kg cell capable of a three-minute charge. Changan-backed Ganfeng Lithium reported a solid-state design achieving 1,100 cycles at 400 Wh/kg, with plans to reach 500 Wh/kg in future variants. CATL has disclosed patents on fluorine-containing lithium compounds and sulfide electrolytes, while Gotion High-tech has designed a 2 GWh all-solid-state production line and operates a 0.2 GWh pilot facility under vehicle testing.
Beyond electric vehicles, solid-state battery development is extending into humanoid robotics, eVTOL aircraft, consumer electronics and energy storage systems, driven by demand for high energy density. Research continues across sulfide, oxide and polymer electrolyte pathways, with unresolved challenges such as lithium dendrite formation, ion transport, interface stability and failure mechanisms. Analysts also note that Chinese companies lag in international patent deployments compared to Japanese and South Korean peers, prompting calls for broader overseas coverage.
China’s first national standard for solid-state batteries—including classifications for liquid, hybrid and solid systems—is currently open for public consultation.
Source: CarNewsChina
