Sodium Ion Battery Manual Winding Machine

Sodium Ion Battery Manual Winding Machine is specially used for winding the battery cells of aluminum foil pouch cell/cylindrical batteries and supercapacitors, which winds the positive and negative electrodes and the diaphragm into battery cells. The machine is small in size, easy to adjust, operate and maintain; the winding needle has a small swing; the guide plate can be adjusted up and down, left and right, front and back; the foot switch controls the forward and reverse rotation. It has the characteristics of easy operation, safety and reliability, and beautiful appearance.

Main features:

The guide plate can be adjusted up and down, left and right, front and back;

 Auxiliary support wheels are provided to ensure the tightness of winding;

 Precision moving parts, small winding needle deflection;

The winding needle is easy and quick to install and replace;

 Compatible with the winding of soft pack and cylindrical batteries;

 The winding can be reversed, the speed is adjustable, and it can work in the argon environment of the glove box;

 The machine is small in size and easy to operate and adjust.

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

• Wechat：15290599353

• WhatsApp/Skype: 13838579492

Technical parameters:

Case: Production of battery roll core of new lithium battery

Background and requirements:

A technology company is developing a new type of lithium battery that will be used in high-performance smart wearable devices. In order to test the electrochemical performance of the battery, it is first necessary to make a battery core that meets specific design requirements. Due to the small production volume, the company chose a manual battery electrode winding machine to complete this task so that different parameters can be adjusted during small batch production to obtain the best battery performance.

Equipment selection:

The company decided to use a manual battery electrode winding machine, which supports the winding operation of positive and negative battery materials and separators, and can flexibly adjust the winding tension, number of layers, winding speed and other parameters, which is suitable for small batch experimental production.

The main technical features of the winding machine include:

Manual tension adjustment: The operator can manually adjust the tension during the winding process according to the characteristics of different materials to ensure the consistency of winding.

Adjustable winding speed: According to the adhesion and thickness of the electrode material, the operator can control the winding speed to avoid bubbles or defects.

Support different electrode sizes: Suitable for electrode materials of various sizes, and can adjust the size ratio of electrodes and separators according to different requirements of battery design.

Process flow

1. Preparation of electrode and diaphragm materials:

Preparation of positive and negative electrode materials: The company uses a new type of lithium cobalt oxide positive electrode material and graphite negative electrode material, and the thickness of the electrode material is 50μm. The positive and negative electrode materials are evenly mixed with conductive agents and binders, respectively, and coated on copper foil and aluminum foil. After drying, they are cut into sizes suitable for winding.

Preparation of diaphragm materials: The diaphragm material is a polyolefin film with a thickness of about 20μm. The diaphragm must have high ion conductivity to ensure that the battery can work stably during charging and discharging.

2. Winding process:

The operator fixes the electrode material and diaphragm material on the two reels of the manual battery electrode winding machine. After the winding machine is started, the operator manually adjusts the winding tension to ensure that the pressure between the positive and negative electrode materials and the diaphragm material is uniform and moderate.

During the winding process, the operator adjusts the winding speed in time according to the thickness and softness of the material to avoid wrinkles or bubbles in the material. In order to ensure the consistency of winding, the winder will stop regularly to check the wound battery core.

During each winding process of the electrode and separator layers, the operator needs to ensure that there are no bubbles between the materials and that the edges of each layer are aligned.

3. Inspection after winding:

After winding, the operator checks the appearance of the battery core to ensure that the thickness of the core is uniform and there are no defects. Any problems found, such as misalignment or bubbles between layers, will be corrected at this step.

To ensure the longevity and stability of the battery, the operator also uses special instruments to test the internal resistance and voltage of the core to ensure that it meets the design requirements.

4. Subsequent processing:

The wound battery core needs to undergo a "charge and discharge test" to verify its performance, including the battery's capacity, energy density, internal resistance and cycle life.

After the charge and discharge test is completed, the battery core will be encapsulated in the battery casing and undergo final testing.

Challenges and solutions:

Winding uniformity problem: In the first few trials, it was found that the positive and negative electrode materials and the separator materials were not fully aligned during the winding process, resulting in unstable battery performance. To solve this problem, the operator manually adjusted the tension and winding speed, and regularly checked the winding quality of each layer to ensure uniform winding.

Bubble problem: Because the positive and negative electrode materials are thin and soft, bubbles appeared in some winding processes, affecting the electrochemical performance of the battery. The operator successfully solved this problem by reducing the winding speed and increasing the pre-pressing process.

Experimental results:

After several rounds of optimization, the final battery core performed well in terms of capacity and energy density, and the cycle test also showed that the battery performance was stable and met the research and development needs. The manual battery electrode winding machine provides the company with flexible operating space and ensures the successful development of new batteries.

Summary:

Through this research and development process, the advantages of the manual battery electrode winding machine in the production of small-batch, high-precision battery cores have been fully utilized. It not only supports flexible adjustment of different battery designs, but also provides sufficient operating space in experimental production, helping the team to achieve better battery performance optimization. In future large-scale production, the company plans to upgrade this technology to automated winding equipment, but in the small-scale research and development stage, the role of the manual battery electrode winding machine is indispensable.