Key Findings
WeLion New Energy has made remarkable strides in semi-solid-state battery technology, demonstrating an impressive energy density of 824 Wh/kg in tests conducted in 2025. This achievement builds upon their successful 2023 collaboration with Chinese EV manufacturer Nio, which resulted in the deployment of a 360 Wh/kg battery pack that enabled Nio vehicles to achieve driving ranges exceeding 1000 km. The company has articulated an ambitious goal to launch an all-solid-state battery with a projected energy density of 400 Wh/kg for automotive applications by 2027, setting a new benchmark for electric vehicle capabilities.
Technical / Clinical Details
WeLion’s semi-solid-state battery technology leverages a hybrid electrolyte design, which significantly enhances both energy density and safety compared to conventional lithium-ion batteries. The battery pack co-developed with Nio in 2023, already demonstrated real-world performance by enabling over 1000 km of range, mitigating range anxiety—a major barrier to EV adoption. The prototype semi-solid-state battery tested in 2025, reaching 824 Wh/kg, represents a substantial advancement in gravimetric energy density. This higher density facilitates lighter and more compact battery designs, not only for EVs but also for potential applications in drones and advanced portable electronics. The hybrid electrolyte aims to combine the high ionic conductivity of liquid electrolytes with the stability and safety benefits of solid-state materials.
Background & Context
The global electric vehicle market is intensely focused on overcoming challenges related to range anxiety and charging times. Solid-state batteries are widely recognized as the next-generation solution, promising superior energy density, faster charging capabilities, and significantly reduced fire risks due to the absence of flammable liquid electrolytes. WeLion’s strategy involves a pragmatic progression through semi-solid-state batteries as an intermediate step, balancing practical commercialization with advanced technological development. Their efforts align with China’s broader national strategy to lead the new energy vehicle sector, positioning WeLion as a key player in this competitive landscape.
Strategic Significance & Outlook
WeLion’s projected 2027 launch of an automotive-grade all-solid-state battery with a 400 Wh/kg energy density could be a transformative event for the EV industry. Achieving this target would bring EV performance metrics, such as range and refueling time, closer to or even exceeding those of traditional internal combustion engine vehicles. This technological leap is expected to intensify competition in the EV market and drive significant shifts across the battery supply chain. Looking ahead, the widespread adoption of higher-density and safer battery technologies will likely extend beyond automotive to various sectors, accelerating the global transition towards sustainable energy solutions.
Source: https://www.industrialbriefs.com/welion-semi-solid-state-batteries/
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