At the Second China All-Solid-State Battery Innovation and Development Summit Forum, Sun Huajun, CTO of BYD’s Lithium Battery division, revealed that BYD successfully produced a 60Ah all-solid-state battery cell on a pilot line in 2024. The company plans to initiate batch demonstration installations for vehicle applications around 2027, with large-scale implementation targeted for post-2030.
Data indicates that BYD’s 60Ah all-solid-state battery achieves an energy density of 400Wh/kg — double that of current liquid-based batteries — while setting new industry benchmarks with its -40°C low-temperature startup capability and 5C ultra-fast charging performance.
According to Sun Huajun, BYD began foundational research on all-solid-state batteries in 2013, focusing on material exploration. Feasibility studies for key technologies commenced in 2016, followed by industrial viability assessments starting in 2023.
BYD has primarily advanced its solid-state battery initiatives through its subsidiary, FinDreams Battery. Analysis suggests FinDreams likely adopted an all-solid-state material system combining high-nickel ternary (single crystal) cathodes, low-expansion silicon-based anodes, and a sulfide-halide composite electrolyte. The cells achieve capacities exceeding 60Ah, with gravimetric energy density of 400Wh/kg and volumetric energy density reaching 800Wh/L. They withstand nail penetration and thermal runaway tests without ignition or explosion. Leveraging advanced thermal management, safety, and fast-charging integration technologies, the battery pack achieves energy densities surpassing 280Wh/kg.
Sulfide-based solid-state batteries, targeting premium electric vehicles, are identified as a strategic direction. Mr. Sun anticipates that between 2030 and 2032, sulfide solid-state batteries will enter an expansion phase, becoming mainstream for high-end EVs.
At the same forum, Ouyang Minggao, an academician at the Chinese Academy of Sciences and a professor at Tsinghua University, outlined a comprehensive technology roadmap: first-generation all-solid-state batteries based on sulfide electrolytes are expected to achieve mass production by 2025-2027, with energy densities reaching 400Wh/kg. Second-generation products, slated for 2027-2030, aim for 500Wh/kg, while third-generation batteries, planned for 2030-2035, target energy densities exceeding 600Wh/kg.
Solid-state batteries are widely regarded as the successor to liquid-based lithium-ion technology and have emerged as a critical frontier in power battery development. Automakers including SAIC, GAC, and Chery have spearheaded efforts in solid-state battery adoption, announcing timelines for mass production and vehicle integration. Battery manufacturers such as CATL, Gotion High-Tech, and Sunwoda are accelerating R&D to remain competitive.
Source: WeChat Official Account——马里亚纳锂电
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