Electric Double Roller Machine for Lithium-ion positive and negative electrode sheet rolling

The electric double roller machine is widely used in the processing of powder materials. Its main function is to finely crush, grind, or shape materials through high-pressure extrusion between two parallel rotating rollers. The device is driven by a motor, which transmits power through a transmission system to the rollers, making them rotate at relative speeds to apply pressure on the materials. The rollers are typically made of high-hardness alloy materials, providing excellent wear resistance and long lifespan, ensuring stable operation in various industrial environments.

Product Overview:

The electric double roller machine is a sheet or coil rolling equipment driven by an electric motor to roll the material. It is suitable for the rolling of positive and negative electrodes in the lithium-ion battery industry, with adjustable thickness, good uniformity, and high precision. It is the preferred choice for researchers for sample preparation and small-batch production due to its simple operation and convenience.

Product Features:

Integrated gantry frame with CNC precision machining for high stability.

The rollers are made of cold-rolled tool steel, heat-treated, and surface-ground for high precision, hardness, and wear resistance.

The rollers are treated with hard chrome plating for good rust resistance and easy maintenance.

Wedge-type roller gap adjustment device.

Standard mechanical dial gauge, optional mechanical micrometer.

Driven by a geared motor, designed for both forward and reverse rolling, with feeding and discharging guide plates.

Optional accessories for continuous rolling process.

Desktop design, compact structure, and easy operation and maintenance.

Purchase Information:

If you are interested in our electric double roller machine, please feel free to contact us for more information and quotations.
Phone: +86 18516380382
Email: Jimmy@cysitech.com
Contact Person: Jimmy Hao
WeChat: +86 18516380382
WhatsApp: +86 13939946898

Technical Parameters:

 Main Components:

Application Fields:

Metallurgical Industry: Used for the pretreatment of ores, steel slag, and other metal materials, efficiently refining coarse materials to improve material uniformity and reactivity during smelting processes.

Building Materials Industry: Commonly used for grinding and shaping cement, ceramics, and other materials, crushing raw materials to the appropriate particle size for subsequent processes, improving the physical properties of the final product.

Chemical Industry: Applied in the production of fertilizers, mineral powders, and other chemicals, allowing precise control over powder granularity to meet specific chemical product process requirements.

Battery Industry: Used in the processing of lithium battery materials, such as electrodes, to improve surface uniformity and enhance battery performance.

Food and Pharmaceutical Industries: Used for processing specific powders or granular materials, particularly for products that require precise control over particle size such as medicines and food additives.

New Materials Industry: With the rise of new materials technology, the electric double roller machine is widely applied in fields like graphene, nanomaterials, and ceramic composites to meet their high-precision granularity requirements. 

Application Case: 《Electric Double Roller Machine for Battery Electrode Sheet Manufacturing》 

Process Steps:

1. Material Preparation

Slurry Preparation: Mix active materials (e.g., NCM, lithium iron phosphate for positive electrodes, graphite for negative electrodes), conductive agents (e.g., carbon black, carbon nanotubes), and binders (e.g., PVDF) in specific ratios, then add solvent (e.g., NMP) and stir to form a uniform slurry.

Mixing and Defoaming: Use a vacuum mixer to ensure the slurry is well-mixed, and use a defoamer to remove any bubbles, ensuring stability and consistency during coating.

2. Coating

Coating: Evenly apply the slurry to copper foil (for negative electrodes) or aluminum foil (for positive electrodes), forming a uniform wet film layer. The coating thickness should be controlled precisely based on electrode specifications and performance requirements.

Drying: Use drying equipment to remove the solvent and solidify the slurry, obtaining a dry electrode sheet. 

3. Roller Pressing

Adjusting Roller Machine Parameters: Adjust the roller gap and pressure of the electric double roller machine based on the design requirements of the battery electrode sheets to ensure uniform thickness and the desired density. Conduct trial presses and adjust roller settings as needed.

Pressing: Press the dried electrode sheets through the rollers to achieve the desired thickness and density, which enhances mechanical strength and optimizes battery performance.

Thickness and Density Measurement: Measure the thickness and density of the pressed sheets to ensure they meet design specifications. If necessary, adjust roller settings and perform secondary pressing.

4. Subsequent Processing

Cutting: Cut the pressed electrode sheets to the required dimensions for battery assembly.

Baking and Dehumidification: Bake the cut sheets in a vacuum oven to remove any residual moisture to meet battery assembly requirements.

Electrode Sheet Testing: Perform tests on the pressed sheets, including thickness consistency, surface flatness, weight, and density, to ensure battery performance and safety.

5. Winding or Stacking (Subsequent Steps)

Winding/Stacking: Wind or stack the electrode sheets with separators and aluminum foil according to the battery design to form the battery core, completing the electrode sheet manufacturing before proceeding to cell assembly.

Key Process Control Points:

Pressing Pressure Control: The pressing pressure during roller pressing directly affects the thickness and density of the electrode sheet, requiring precise control based on the characteristics of the materials.

Roller Temperature Control: In some processes, the rollers need to be heated to improve material consolidation, enhancing electrode sheet density and surface flatness.

Thickness Consistency: Use precision measuring equipment to monitor electrode sheet thickness in real time to ensure consistency across batches and guarantee uniformity and reliability in battery assembly.