Li MEGA features a one-piece rear floor frame and longitudinal beams, designed as separate components. This not only ensures structural strength but also effectively reduces maintenance costs for users.

The cage body is shaped by using boron steel in key parts including A-, B-, and C-pillars, door sills, and door intrusion beams. It not only disperses the impact force but also improves the overall body rigidity for better passenger safety and maneuverability.The Li L8 cage body has a torsional stiffness of 30000 Nm/deg, which means the A-pillar, door sill, and foot area can remain intact when the vehicle overturns.

Force transmission pathways and the sectioning system minimizes harm to passengers and damage to the body structure during a collision.With energy classification strategies for the vehicle, system, and key components, we have developed continuous and circular force transmission pathways and sectioning systems for main force transmission channels such as the front and rear bumper beams, front and rear longitudinal bumper beams, cabin side beams, subframe, door sills, floor beams, and A-,B-, and C-pillars.

In addition to the main beam, force transmission pathways such as the subframe deform and absorb energy, which minimizes damage to both vehicles in the collision.The body is designed to absorb and disperse the collision energy in a variety of complex conditions. As vehicle-to-vehicle collisions are usually at higher speeds, with a shorter reaction time, and rapid acceleration increases, multiple force transmission pathways are needed to absorb and disperse forces to avoid stress concentration.

Positive energy management and load distribution are adopted in the body in white (BIW) stage to precisely optimize the topology of key body components and section structures for optimal steel application.For example, 75% of the Li L8 BIW frame is made of high-strength steel, and 28.9% of the steel is boron steel, which is super hard (second only to ceramic) and tough at the same time, giving the Fortress Safe Body better crash resistance and overall safety.

Li Auto's smart manufacturing factories keep optimizing production processes through data to ensure Li Auto Fortress Safe Body™ production is of the highest quality.Since its inception, Li Auto has always remained committed to building its own factories to manufacture its vehicles. With intelligent stamping, welding, painting, and final assembly workshops equipped with leading automation equipment, vehicle manufacture quality always remains high.

Li Auto's manufacturing data algorithm system integrates a machine learning algorithm model and a process mechanism model.The data algorithm system uploads and analyzes hundreds of millions of pieces of manufacturing data every day to conduct real-time monitoring and issue intelligent early warning alerts for key manufacturing processes and equipment indicators such as for body precision, weld joint quality, paint film thickness, and torque quality. This makes it possible to trace all process data throughout the manufacturing process.

An array of welding processes including SPR, spot welding, stud welding, projection welding, arc welding, and laser welding are adopted to take the body structure strength to the next level.The welding workshop in the Changzhou factory boasts a linked automation rate of 95%, with over 1200 welding robots and advanced automation equipment for welding, riveting, and gluing, making our welding processes comparable to those of other Chinese luxury vehicle manufacturers.

Li Auto's smart manufacturing factory embraces online real-time monitoring systems, including China's first online body measuring system. The production data of each vehicle is connected to the MMDS data management platform to ensure the superior and consistent quality of the Li Auto Fortress Safe Body™.China's first online body laser measuring system supports total body monitoring through surrounding cameras. Real-time closed-loop feedback of body quality based on actual measurements ensures that the frames are the right size and quality standards are met.

The L series adopts Ni6 high-performance cells with superior safety. The battery pack which uses new fire-resistant material does not diffuse heat or cause open flames.

The battery pack is protected by side beams and an aluminum alloy frame structure to effectively protect it from front, side, and rear impacts.

Li Auto's special anti-bottom scraping design which uses an aluminum alloy underbody guard can block obstacles before they go under the vehicle to prevent damage to the battery system.

Through real-time early warning of faults, the after-sales tech team are able to reach out to users to assist, further helping keep the vehicle safe.

Li L6 has obtained the highest rating certification of C-IASI! Starting from 2024, CIRI implements the latest regulations. Under higher safety requirements, Li L6 continues the safety standards and configuration of the family flagship product, becoming one of the first batch of vehicle models to pass the new regulations and obtain a G+G+G+A rating*.

Li L7 received Double Gs in the C-IASI crashworthiness tests for its excellence in the overall rating of driver and passenger-side 25% small overlap frontal. Scoring 99.8% in the vehicle assistance safety test, Li L7 is now the best-performing SUV model ever tested at C-IASI*.

Li L8 achieved the best results recorded in C-IASI's mid-to-large SUV tests*, and received a G rating for in-car occupant safety, pedestrian safety, and vehicle assistance safety, as well as for the passenger side 25% offset crash test, a non-standard test item.

Li L9 obtained a weighted score of 91.3% to receive the C-NCAP Five Star Rating, a record C-NCAP and CCRT score. Li L9 received G, the highest C-IASI rating for 25% offset crash tests on both the driver and passenger sides, as well as side impacts.

Under the latest regulations implemented by CIRI starting from 2024, Li MEGA has obtained the highest rating certification of C-IASI and an rating of G in safety testing with its flagship safety strength, becoming the first MPV vehicle model under the new regulations to meet the double G and double zero defect requirements for a front 25% offset collision between the driver and passenger seats.

Li ONE obtained a weighted score of 92.2% to receive the C-NCAP Five Star Rating. Li ONE scored 94.73% for occupant protection, 72.89% for pedestrian protection, and 100% for active safety. That made Li ONE the only medium-to-large SUV in China to achieve the best results in C-NCAP, C-IASI, and C-AHI in 2021.