Lithium batteries play a crucial role in modern technology, powering everything from smartphones to electric vehicles. To ensure the reliability and safety of lithium batteries, the assembly process must be executed with precision. Gluing is an essential step in this assembly, used for various purposes such as sealing, connecting, and bundling components. However, due to the unique characteristics of battery assembly, various abnormal issues can arise during the gluing process of lithium batteries. In this article, we will explore common problems encountered during gluing in lithium battery assembly and propose solutions to address them.
Abnormal Glue Pulling
Issue 1: Glue Cannot Be Pulled
One common problem is when the glue cannot be pulled, resulting in empty pulling. This issue can occur due to the following reasons:
a) After the last glue cutting, the tape was not effectively pressed, causing the tape to retract.
b) The glue clamp claw is damaged, leading to the inability to grip the glue.
Solution: To resolve this problem, follow these steps:
- Check if the pressure of the glue cylinder is abnormal.
- Ensure the cylinder is correctly positioned.
- Examine the glue quality.
- Inspect the glue clamp claw for damage and replace it if necessary.
Issue 2: Insufficient Drawing Length
Insufficient drawing length occurs when the pulled glue length does not meet the requirements or when the tape separates from the claws during the drawing process. This issue may be attributed to:
a) Abnormalities in the pulling glue cylinder.
b) Irregular film tension, resulting in either inadequate pulling or tape rebounding.
Solution: To overcome this problem, consider these solutions:
- Use a servo module for glue pulling to facilitate precise length adjustment and control.
- Increase the tension of the film during unwinding.
- Implement a magnetic powder clutch to regulate unwinding tension effectively.
Abnormal Glue Cutting
Issue: Cutting Glue and Removing Tape
An abnormality during glue cutting involves the cutter cutting the glue and removing the tape simultaneously. This problem may occur due to the following reasons:
a) Insufficient cutter life, causing it to pass through the glue, resulting in continuous gluing.
b) Inadequate control force applied to the cutter’s cylinder.
Solution: To tackle this issue, implement the following measures:
- Utilize cutting knife materials made from titanium alloy.
- Regularly check and replace the cutting knife as indicated by the program.
- Ensure that the cylinder diameter meets the requirements (≥ 25mm).
Abnormal Glue Application
Issue: Gluing Abnormalities
Abnormal glue application can manifest as tape being taken up after gluing, tape folding, or gluing position deviations. These problems may have various root causes:
a) Flaws in the glue head design leading to unstable suction.
b) Residual glue inside the suction head causing glue-related issues.
c) Inadequate accuracy in the cylinder-based glue mechanism.
Solution: Address this issue with the following solutions:
- During the design phase, ensure the glue head is designed to meet process requirements. Implement a servo module for precise glue removal and stability.
- Regularly clean the suction head and the drawing mechanism on-site to prevent tape from sticking.
- By identifying and troubleshooting these common gluing issues in lithium battery assembly, manufacturers can improve the reliability and efficiency of the assembly process, ultimately leading to higher-quality lithium batteries for various applications.
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