Semi-Automatic Cylindrical Winding Machine for Soft pack lithium battery production

The semi-automatic cylindrical winding machine is a device that can be used in the winding process of cylindrical lithium-ion battery electrodes. Compared with the manual winding machine, this equipment has high winding efficiency, good winding uniformity, and a wide range of applicable battery sizes. It is more suitable for various cylindrical battery winding needs in lithium battery laboratories.

Main features:

 The diaphragm is fed with constant tension, and the cell tension is consistent;

The electrode guide can easily adjust the width to adapt to a wide range of electrodes;

 The machine is controlled by a human-machine interface, and the operation is simple and intuitive;

 Automatic alarm and display of fault location in case of abnormality, which is convenient for handling;

 The operation is simple and easy to learn, and productivity can be formed as soon as possible;

 Automatic diaphragm placement, automatic winding, automatic cutting, and manual tape application (automatic tape dispensing machine is provided).

 Purchase information:

If you are interested in our winding machine, please contact us for more information.

• Tel：138 3857 9492

• Email：carol@cysitech.com

• Contact：Carol Xu

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Technical parameters:

Case: Application of semi-automatic cylindrical battery winding machine in power tool battery production

Background and demand

A battery manufacturing company focuses on the production of cylindrical lithium-ion batteries for power tools. Under the rapidly growing market demand, the company plans to expand production capacity and improve production efficiency. In order to meet production needs, reduce the cost of manual operation, and ensure the consistency of winding quality, the company decided to introduce a semi-automatic cylindrical battery winding machine.

The company mainly produces cylindrical batteries with specifications of 18650 (18mm diameter, 65mm length). In the traditional manual winding process, the operator's experience and technical level directly affect the quality of the battery core, so the company decided to improve production efficiency and product consistency through semi-automatic equipment.

Equipment selection

The semi-automatic cylindrical battery winding machine selected by the company has the following characteristics:

Semi-automatic operation: The operator only needs to place the electrode material and the diaphragm material on the winding machine, and the parameters such as tension, winding speed, and winding times during the winding process are automatically adjusted by the machine, which greatly reduces the errors of manual operation.

High-precision winding: Through precise tension control and winding speed adjustment, the uniformity of each layer of material is ensured, and the consistency of the battery core is improved.

Adapt to different electrode materials: The machine supports the winding of a variety of electrode materials and diaphragms, is suitable for the production of cylindrical batteries of various specifications, and can flexibly respond to different production needs.

Automatic cutting function: After the winding is completed, the equipment will automatically cut the excess electrode and diaphragm materials to ensure the perfect forming of the battery core.

Process flow

1. Raw material preparation

Positive and negative electrode material preparation: The company uses lithium cobalt oxide (LiCoO₂) as the positive electrode material and graphite as the negative electrode material. These materials need to be mixed with a binder and a conductive agent first, and coated on aluminum foil and copper foil, and cut into appropriate sizes after drying.

Diaphragm material preparation: The diaphragm used by the company is a polyolefin film with good mechanical strength and conductivity.

 2. Semi-automatic winding process

Material loading: The operator places the positive and negative electrode materials and diaphragm materials on the reel of the winder in sequence. The electrode materials of each reel must be placed in the prescribed order to ensure the correctness of the winding.

Automatic winding: After the semi-automatic winding machine is started, the machine automatically starts winding according to the set parameters. The operator does not need to manually control the winding speed and tension, and the equipment will automatically adjust the relevant parameters according to the specifications and materials of the battery.

The machine will accurately control the tension of each circle of electrodes and diaphragms to avoid bubbles or overlap.

During the winding process, the tension of the electrode and diaphragm materials remains uniform to ensure the quality of the battery core.

Automatic trimming: After the winding is completed, the equipment will automatically trim the excess electrodes and diaphragms to ensure that the two ends of the battery core are flat and meet the requirements of battery packaging.

3. Inspection and quality control

Winding quality inspection: After each batch of battery cores is completed, the operator will check whether the wound battery core meets the design requirements. The main inspection parameters include the size of the core, whether the appearance is intact, whether there are bubbles or defects, etc.

Battery testing: In order to ensure the performance of the battery, the manufacturing company will perform charge and discharge tests on each battery to test its capacity, internal resistance and cycle performance. If the performance of the battery meets the requirements, it will enter the next packaging step.

4. Packaging and subsequent processing

After winding and testing, the battery core will be packaged into the shell and subjected to a series of subsequent processing such as charging, charge and discharge testing, and finally form a finished battery that meets market standards.

Challenges and solutions

Uneven winding of electrode materials: In the early stage of production, it was found that some batches of electrode materials were uneven during winding, resulting in unstable battery performance. This problem was solved by adjusting the tension control and winding speed of the machine to ensure the uniformity of each layer of material.

Bonding problem between diaphragm and electrode: When using certain diaphragm materials, it was found that the diaphragm was prone to adhesion with the electrode during winding. To this end, the team fine-tuned the equipment, optimized the tension control system of the winding machine, ensured the separation between the materials, and solved the bonding problem.

Experimental results and achievements

Improving production efficiency: After the introduction of the semi-automatic cylindrical battery winding machine, the production efficiency has been greatly improved. Compared with traditional manual winding, the production cycle has been shortened by about 30%. More battery cells can be produced per hour while maintaining consistent quality.

Improving product consistency: The precise control of semi-automatic equipment reduces the interference of human factors, and the consistency of products has been significantly improved. The internal resistance and capacity test results of the battery core are more stable and meet higher quality standards.

Reduce labor costs: Through the application of semi-automatic equipment, the dependence on highly skilled workers is reduced, labor costs are reduced, and operators can focus more on equipment maintenance and quality inspection.

Summary

By introducing a semi-automatic cylindrical battery winding machine, the company not only improved production efficiency and product quality, but also reduced production costs. While ensuring consistency, the flexible operating settings also enable the company to adapt to the needs of different specifications and materials. This shift enables the company to respond quickly to market demand and enhance its competitiveness in the field of battery manufacturing. As market demand continues to grow, the company plans to gradually introduce fully automated equipment to further increase production scale and automation.