The difference between flat burrs and end burrs in lithium batteries

The difference between flat burrs and end burrs in lithium batteries

1、 Introduction

In the production process of lithium batteries, flat burrs and end burrs are common quality issues. They not only affect the appearance quality of the battery, but may also have a serious impact on the performance and safety of the battery. We analyze the differences and causes of surface burrs and end burrs in lithium batteries, explore the impact of these two types of burrs on the performance and safety of lithium batteries, and propose a series of effective solutions, aiming to provide reference for quality control in the production process of lithium batteries.

2、 The difference between flat burrs and end burrs in lithium batteries

1）. Flat burrs

Flat burrs refer to the burrs formed on the flat part of the lithium battery electrode. In the production process of lithium batteries, the electrode plates need to go through multiple processes such as cutting and punching. Unreasonable parameter settings, tool wear, and material problems in these processes can all lead to the generation of flat burrs. The prevalence of flat burrs is high, and there are often varying degrees of flat burrs in each production batch.

2）. End face burrs

End face burrs refer to the burrs formed on the end face of the lithium battery electrode. Similar to flat burrs, the generation of end face burrs is also related to factors such as production process, tool wear, and material properties. Due to the unique location of end face burrs, once formed, it is difficult to eliminate them through simple subsequent processing, so their universality is relatively high.

3、 The impact of flat and end burrs on the performance and safety of lithium batteries

1）. Impact on performance

The presence of flat burrs and end burrs can increase the internal resistance of lithium batteries, thereby reducing their charging and discharging efficiency. At the same time, burrs may also puncture the internal separator of the battery, causing a short circuit in the battery and further affecting its performance.

2）. Impact on security

The presence of burrs may pierce through the separator inside the battery, causing a short circuit inside the battery, leading to safety accidents such as thermal runaway, combustion, and even explosion. In addition, burrs may also cause problems such as liquid leakage and gas expansion during the charging and discharging process of the battery, further threatening the safety of the battery.

4、 Solution

To address the issues of flat and end burrs in lithium batteries, solutions can be proposed from the following aspects:

1）. Optimize production process parameters

By adjusting the process parameters of cutting, punching and other processes, such as cutting speed, cutting depth, tool clearance, etc., the generation of burrs can be effectively reduced. At the same time, regular inspection and replacement of cutting tools to ensure their sharpness and accuracy is also an important measure to reduce burrs.

2）. Improve material properties

Choosing materials with high shear strength and easy processing can effectively reduce the generation of burrs. In addition, surface treatment of materials, such as coating lubricants, can also reduce the probability of burr formation.

3）. Strengthen quality inspection and control

Strengthening quality inspection and control during the production process, timely discovering and handling burrs, can effectively avoid the impact of burrs on battery performance and safety. Meanwhile, establishing a sound quality management system and traceability mechanism is of great significance for improving product quality and market competitiveness.

4）. Develop new processing technologies

With the advancement of technology and the continuous emergence of new processing technologies, the development of new technologies suitable for processing lithium battery electrodes, such as laser cutting, water jet cutting, etc., can fundamentally solve the problem of burrs. These new processing technologies have advantages such as high precision, high efficiency, and low damage, which can significantly improve the production quality and efficiency of lithium batteries.

5、 Conclusion

Burrs on the flat surface and end face of lithium batteries are common quality issues in the production process, which can also have a significant impact on the performance and safety of batteries. By optimizing production process parameters, improving material properties, strengthening quality inspection and control, and developing new processing technologies, various measures can effectively solve these problems and improve the production quality of lithium batteries.