Based on market demand and actual customer working conditions, the Jingye Group Research Institute, together with the Group's steelmaking and rolling processes and Jingye High-Quality Steel Business Unit, has focused on tackling the independent research and development of steel technology for thin battery casings.

In response to common industry challenges in the rolling of thin battery casing steel, such as insufficient steel cleanliness, uneven internal structure, and poor material stability, the dedicated technical team worked on the front line of production, collaborating with multiple processes, including steelmaking and hot rolling, to tackle the problems and iteratively optimize the process. In the steelmaking process, the team improves the intrinsic quality of steel from the source by precisely controlling processes such as RH refining cycle time and tundish tonnage, thus laying a solid foundation for high-quality production of battery casing steel.

To address the issues of poor forming and unstable performance of thin steel in the cold rolling annealing process, the technical team continuously improved the annealing process model, stabilized the steel grain structure, and enhanced elongation and deep drawing performance; they also optimized the work rolls in the leveling section to precisely control surface roughness, ensuring that the products fully meet customer needs.

Adhering to the philosophy that "making good products is the best customer service", the R&D team implements EVI forward-looking technical services, goes deep into the customer's production site, participates in the customer's product design and process matching in advance, and optimizes the hardness and forming performance of steel one-on-one based on the customer's equipment conditions, stamping conditions and product standards to achieve a comprehensive match between products and customer needs.

The customer stated, "Previously, when using similar materials, the stamping yield was only 82%, production fluctuated greatly, and the production line was frequently forced to shut down, resulting in high waste costs. After switching to the battery casing steel developed by Jingye, the stamping stability has been greatly improved, the yield has increased to 98%, and the production line can operate continuously, effectively increasing our production capacity." Customer recognition is the greatest driving force for the company's progress. Currently, this steel has achieved a stable supply of thousands of tons, contributing to the self-reliance and controllability of China's new energy industry chain.

The successful development of steel for thin battery casings represents not only a major technological breakthrough but also the practical implementation of Jingye Group’s EVI proactive technical service philosophy. Moving forward, Jingye High-Quality Steel will continue to address the pain points of customers’ operational conditions, ensuring long-term, stable production for new energy customers through customized, high-end premium steel products and proactive technical services.