Lanrui and Fuyao's Jointly Developed EC Dimming Glass Enters Mass Production on All-New Li Auto L9

At the launch event of the all-new Li Auto L9, electrochromic (EC) smart dimming glass—co-developed by LanRui and Fuyao—made its debut as a core cabin feature, marking the first mass-production application of LanRui’s third-generation EC technology in the premium intelligent vehicle segment. This achievement stems from a collaborative project among LanRui, Fuyao, and Li Auto, aimed at establishing a new standard for light control in high-end intelligent cabins. Since the project’s inception, the three parties formed a joint team focused on three critical criteria: automotive-grade reliability, compatibility with curved surfaces, and production stability. Through multiple rounds of material validation, process development, and production line integration, they successfully established a complete mass-production chain—from materials and EC films to finished glass units and final vehicle integration—meeting the stringent quality requirements of both Fuyao and Li Auto. The EC dimming glass featured in the Li Auto L9 offers several advanced functionalities: - Light transmittance can be adjusted between 10%–12% in clear state and as low as 0.25% in dark state, achieving a dimming ratio exceeding 40x to effectively ensure cabin privacy. - A gentle, half-minute transition strategy minimizes abrupt light changes that could cause visual discomfort, while multi-level adjustment settings accommodate varying lighting conditions and user preferences. - The next-generation EC material blocks 95% of infrared radiation and 99.9% of ultraviolet rays, significantly reducing interior temperature rise under direct sunlight and easing the load on the vehicle’s thermal management system. - The glass features a neutral, natural tint that harmonizes with diverse interior design styles. - Its all-solid-state structure includes a power-loss memory function, ensuring the glass retains its current transmittance state during power outages, thereby enhancing safety and operational stability. With the market launch of the Li Auto L9, this EC dimming technology has officially entered real-world user scenarios, ushering in a new era of intelligent cabin light control.