Why do rechargeable button cells use laser welding ...

Editorial：Philina

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Issue Date：2022-09-16

Views：3961

In recent years, the explosion in popularity of TWS headphones has driven unprecedented demand for new rechargeable button batteries. These batteries, known for their long running time, high security, and personalization options, have become integral in various small wearable devices like hearing aids, electronic tags, GPS, sensors, smart watches, smart glasses, and smart speakers.

Button cells, also called button batteries or rechargeable coin cells, stand out due to their good consistency and absence of bulging problems during charge and discharge cycles. They can support larger battery capacities and be directly laminated onto PCB boards. These rechargeable button cells not only support fast charging technology for special applications but are also environmentally friendly and reusable.

As the 3C electronics industry develops further, customers are demanding higher battery safety standards. This, in turn, places greater requirements on production line equipment. Consequently, most rechargeable steel-cased coin cell batteries on the market are produced using laser welding technology.

Do you know why rechargeable steel-cased coin cell batteries use laser welding technology? Let's explore.

Button Battery Laser Welding Application Process

1. Shell and cover: Button steel shell laser etching;

2. Cell segment: Coil core positive and negative poles and shell cover welding, shell cover and shell laser welding, sealing nail welding;

3. Module PACK section: Cell screening, side gluing, positive and negative pole welding, post-welding inspection, dimensional inspection, adhesive paper on and off, air tightness inspection, and sorting off.

Why Use Laser Welding Technology for Rechargeable Steel-Case Button Batteries?

Traditional welding techniques often struggle to meet the high standards required for the new rechargeable button batteries. Laser welding, however, excels in welding diverse materials such as stainless steel, aluminum, copper, and nickel. It handles irregular welding trajectories, detailed welding points, and precisely positioned welding areas, improving product consistency while minimizing defects. Laser welding is the best method for joining button batteries.

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The positive and negative electrodes and shell cover are made from copper, which is highly reflective and has low laser absorption rates. The material's thinness can cause deformation if too much heat is applied, making traditional welding unsuitable. Laser welding provides the precision needed to handle the thin materials used in button batteries.

The top cover sealing welding connects the button battery shell to the cover, which is only 0.1mm thick. Traditional welding techniques cannot achieve this. Laser welding ensures power precision, preventing damage to the internal core and deformation while forming a proper weld pool.

Additionally, pins are often welded through the finished battery in a stacked manner. Here, the battery is encapsulated and filled with electrolyte. A stable welding process is crucial to avoid internal short circuits, electrolyte leakage, and false welding.

Laser welding technology suits automatic assembly and welding manufacturing for steel-cased button batteries. Its modular design is compatible with 8-16mm button battery cell assembly, ensuring production line data traceability.

Laser welding equipment offers a fully automated assembly process from cell screening to precise welding control, energy detection, and post-welding inspection. This ensures high-quality, efficient production with a welding success rate of 99.5%.

Grepow uses laser welding equipment featuring data traceability, ensuring precise tracking of production processes and easy retrieval of relevant data to maintain product quality.

The above explains why rechargeable steel-cased button batteries adopt laser welding technology. As a manufacturer, Grepow continues to innovate, offering high-performance button battery solutions, aiding the development of the audio and smart wearable market.

Whether it involves cutting, bending, or welding, TRUMPF provides a comprehensive suite of tools. Components can be processed selectively with laser precision, keeping surrounding areas intact during cleaning.

Do you need support? Our experts at the TRUMPF Laser Applications Center conduct feasibility tests, provide recommendations, and ensure optimal parameters for your application. Unlike other laser manufacturers, we assist you in networking your laser systems, whether you're starting or progressing toward a networked future.

Contact us to discuss your requirements for a cylindrical lithium battery production line. Our sales team will help identify the best options for your needs.