Customer Background

A leading lithium battery manufacturer required high stability and consistent cutting performance for electrode slitting applications.

During the production of a new battery cell model, the customer experienced an unexpected reduction in slitting knife life. The knife life decreased from approximately 300,000 meters to 150,000 meters, while burr performance became unstable throughout the knife’s operating cycle.

The customer required a solution that could restore knife life, improve slitting consistency, and reduce machine adjustment difficulties.

Challenge

The main production issues included:

· Significant reduction in slitting knife service life;
· Unstable burr control during continuous operation;
· High sensitivity of the fixed knife holder system to installation accuracy;
· Difficulty maintaining consistent cutting conditions.

A simple knife material adjustment could not fully solve the problem. A complete evaluation of the knife system and machine conditions was required.

Root Cause Analysis

Shengong’s technical team conducted an on-site investigation covering the slitting equipment, knife mounting structure, installation conditions, and cutting performance.

The analysis showed that the main cause was related to the fixed knife disc structure rather than the knife itself.

Because the fixed knife system is highly dependent on the axial accuracy of the knife holder, any deviation could affect the cutting position and force distribution, resulting in:

· Unstable cutting performance;
· Increased burr variation;
· Premature knife wear;
· Reduced knife service life.

Customized Solution

Compared with traditional fixed knife disc structures, the solution provides:

· Easier knife adjustment and faster production setup;
· Reduced influence of installation errors on cutting quality;
· More stable cutting performance;
· Extended knife service life.

Based on the on-site analysis, Shengong proposed upgrading the customer’s conventional fixed knife disc structure to a high-precision rotary knife system.

The rotary knife system features Shengong’s independently developed and designed precision knife holder, which is protected by a design patent. Through optimized structural design and improved knife positioning accuracy, the system enhances mounting stability and reduces the impact of knife holder axial accuracy variations on slitting performance.

By optimizing the knife system, holder structure, and application conditions, Shengong delivered a reliable slitting solution for advanced lithium battery manufacturing.

Result

After implementation and production verification, the upgraded rotary knife solution achieved the customer’s requirements:

· Restored required knife life performance;
· Improved burr consistency during slitting;
· Reduced adjustment complexity;
· Enhanced production stability.

Based on the successful application, the customer proceeded with purchasing Shengong’s precision rotary knife system for further production use.

Summary

In lithium battery electrode slitting applications, cutting performance depends not only on knife material and edge quality, but also on the overall knife system design and equipment accuracy.

Through on-site analysis and customized structural optimization, Shengong provided a reliable slitting solution that improved production stability and reduced operational challenges for the customer.

About Shengong

Shengong develops patented precision knife holder systems and customized slitting solutions for demanding industrial applications, including lithium battery, film, and metal processing industries.

For product or technical inquiries, please contact: Howard@scshengong.com