Jingye Group Successfully Develops Steel for Thin Battery Casings
Nov 09,2026
SHIJIAZHUANG, China — As the new energy industry continues to iterate and upgrade, the materials used for battery structures have become a critical factor influencing safety, energy density, and service life. Recognizing these evolving needs, Jingye Group’s Research Institute has collaborated with our steelmaking, steel rolling, and Jingye High-Quality Steel teams to achieve a major technical breakthrough: the successful development of high-performance steel for thin battery casings.
This success marks a key step forward for Jingye in providing stable, thousand-ton-level supply to China's domestic new-energy supply chain, particularly for manufacturers of cylindrical lithium-ion batteries.
Challenges in Thin Battery Casing Steel Production
Thin battery casing steel is a vital base material for cylindrical lithium-ion batteries. However, because of its ultra-thin gauge and the demanding production environments it faces, the steel requires extremely high precision, strict cleanliness, and a very narrow processing window.
Even minor material fluctuations can lead to severe forming defects during high-speed, continuous mass production. For many new energy manufacturers, these challenges often result in inconsistent product quality, high scrap rates, and frequent line interruptions—creating significant bottlenecks and high waste costs in their stamping operations.
To tackle these industry-wide challenges, the Jingye technical team worked directly on the production lines, coordinating multi-stage upgrades across the steelmaking, hot rolling, and cold rolling processes.
Manufacturing Process Improvements
To ensure material consistency and resolve issues like insufficient steel cleanliness, uneven internal structures, and unstable performance, Jingye's technical teams optimized several key production phases:
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The Steelmaking Stage: The team precisely controlled the RH refining cycle time and the tundish tonnage. This carefully improved the steel's internal quality and cleanliness from the root, laying a reliable foundation for high-quality production.
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The Cold Rolling and Annealing Stage: To address poor forming and unstable mechanical properties in thin gauges during cold rolling and annealing, our engineers continuously upgraded our annealing process models. This successfully stabilized the grain structure, significantly improving both the elongation and deep-drawing properties of the steel.
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Surface Quality Control: Our teams optimized the work rolls in the leveling section, allowing them to precisely control surface roughness to match our clients' exact specifications.
EVI Technical Support for Customer Applications
Guided by our philosophy that “making a great product is the best form of customer service,” the Jingye R&D team utilized our EVI (Early Vendor Involvement) service model. Rather than just delivering material, our engineers went directly to our customers’ production sites to participate in product design and process matching from an early stage.
By analyzing the customers’ specific equipment conditions, stamping environments, and final product standards, we were able to provide one-on-one optimization of the steel’s hardness and forming performance, ensuring our materials perfectly fit their lines.
The impact of this collaborative, tailored approach has been substantial. According to customer feedback, after adopting Jingye's specialized battery casing steel, their stamping yield increased from 82% to 98%. The customer also reported significantly improved production stability, fewer production line interruptions, and a notable reduction in overall material and downtime costs.
Supporting the New Energy Industry
Currently, this high-precision steel has achieved stable, thousand-ton-level supply, making a tangible contribution to the reliability of the new energy industry's supply chain.
The successful development of thin battery casing steel is both an important technical achievement and a practical application of Jingye’s proactive, partner-focused EVI model. Moving forward, Jingye High-Quality Steel will continue to focus on the technical challenges and pain points of our customers, providing customized, high-end steel solutions and upfront technical support to ensure long-term, stable, and efficient production for the new energy sector.
Interested in our cold-rolled steel products or customized deep drawing and stamping grades? Please learn more about our technical R&D capabilities or contact Jingye's technical team today to discuss your material requirements and technical specifications.
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