Troubleshooting Common Abnormal Problems Of Lithium Battery Winding Machine

Introduction

As an indispensable power source for modern electronic devices, every link in the production process of lithium batteries is crucial. As one of the key equipment of the lithium battery production line, the stability and efficiency of the winding machine directly affect the quality and output of the lithium battery. This paper will start from the common abnormal problems of lithium battery winding machine, combined with data analysis and practical experience, in-depth discussion of the causes of these problems and solutions, in order to provide valuable reference for the lithium battery production industry.

Common abnormal problems of lithium battery winding machine

1. Bad winding:

Problem description: bad winding is mainly manifested as uneven cell density, wavy winding, and gap generated by winding. These problems can lead to the decrease of cell capacity, abnormal internal resistance, and poor cycle life.

Data analysis: According to production data statistics, the winding defect rate accounts for about 30% of the total defect rate of lithium batteries, of which the uneven cell density accounts for 60% of the winding problems, and the wave and gap problems account for 20% and 15% respectively.

Solution:

Adjust the winding tension: ensure that the tension is uniform during the winding process to avoid too large or too small tension resulting in cell deformation or gaps.

Optimize the winding speed: properly reduce the winding speed to ensure the positioning accuracy of the diaphragm on the cell tube, and reduce the phenomenon of waves and gaps.

Strengthen equipment monitoring and maintenance: Regularly maintain and calibrate the winding machine to ensure that the equipment is in the best working condition.

2. Card material and cut material

Problem description: Stuck material and broken material is a common mechanical failure of the winding machine, which will lead to machine shutdown and seriously affect the production efficiency.

Data analysis: According to equipment failure statistics, the problem of card and cut off material accounts for about 20% of the total failure rate of the winding machine, of which the problem of card material accounts for 60% and the problem of cut off material accounts for 40%.

Solution:

Check and tighten the chuck and gripper: ensure that the chuck and gripper are not loose, no foreign matter, to avoid loose or foreign matter caused by card problems.

Optimize sensor detection: Periodically check the working status of the cut-off sensor to ensure that the sensor can accurately detect and feedback the cut-off information.

Reduce the winding tension: adjust the winding tension properly to avoid the problem of cutting off material caused by excessive tension.

3. The battery shifts upward or downward

Problem description: The upper and lower offset of the battery means that after the lithium battery is wound, the core tube is inconsistent in the upper and lower position of the battery housing.

Data analysis: According to product quality testing data, the battery up and down offset problem accounts for about 10% of the total defective rate of lithium batteries.

Solution:

Improve the operation skills: strengthen the operation skills training of the winder, improve its operation standards, and ensure the accurate position of the core tube in the battery housing.

Optimizing the diaphragm tension: Focus on optimizing the diaphragm tension to ensure the positioning accuracy of the diaphragm on the cell tube and reduce the deviation phenomenon.

4. Winding deflection and relaxation

Problem description: Winding deflection and relaxation means that during the winding of the core tube, the winding is not on the diaphragm or overlaps on the battery housing, and the winding is loose.

Data analysis: According to production data statistics, winding deviation and relaxation problems account for about 5% of the total defective rate of lithium batteries.

Solution:

Adjust the winding gap: Pay attention to the adjustment of the winding gap and adjust the winding position in time to ensure the stability of the winding on the diaphragm.

Improve the accuracy of the equipment: improve the degree measurement specification of the winding machine to ensure that the deviation of each link does not exceed plus or minus 1mm.

Conclusion

The common abnormal problems of lithium battery winding machine in the production process mainly include bad winding, stuck material and broken material, battery up and down offset, winding deviation and relaxation. In order to solve these problems, this paper puts forward the corresponding solutions, including adjusting the winding tension, optimizing the winding speed, strengthening the equipment monitoring and maintenance, improving the operation skills, optimizing the diaphragm tension and so on. By implementing these solutions, the defective rate in the production process of lithium batteries can be effectively reduced, and production efficiency and product quality can be improved.