Precision Roll Press for Lithium-ion positive and negative electrode sheet rolling

A roll press uses one or more pairs of cylindrical rollers to press materials through the gap between the rollers with varying pressures. This process makes the material's particle size more uniform, increases its density, or compresses it into a specific shape. As the material passes through the rollers, the pressure between the rollers can compress it into thin sheets or blocks to meet production requirements.

Product Overview:

The CY-DPC-B230 precision roll press is a high-precision rolling machine designed for continuous rolling of coil material, with an optional winding/unwinding device. The equipment uses a hydraulic system to provide pressure for the roller pressing process, suitable for situations requiring high consistency in rolling force and roller gap. The roller diameter is 230mm, with a maximum rolling width of 200mm. The maximum rolling force can reach 80 tons, with a uniformity of rolling thickness at ±1.5μm, meeting the requirements for high-density compaction and high-precision rolling. This is particularly suitable for the production of positive and negative electrode sheets in the lithium-ion battery industry.

Product Features:

Automatic roller gap adjustment via a stepping motor

Patented hydraulic balance rolling mechanism with stable pressure output and no leakage, ensuring excellent uniformity in both transverse and longitudinal rolling

Rolling force collection and storage function for monitoring rolling force curves

Integrated gantry frame, CNC precision machining to ensure high stability

Rollers are made of cold-rolled tool steel with heat treatment and surface grinding for high precision, hardness, and wear resistance; the surface is coated with hard chrome for rust resistance and ease of maintenance

Optional winding/unwinding device for continuous coil rolling, ensuring neat winding

Purchase Information:

If you are interested in our precision roll press, 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:

Applications:

Metallurgy Industry: Used for pre-processing ores, steel slag, and other metal materials, efficiently refining coarse materials to improve material uniformity and reactivity during the smelting process.

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

Chemical Industry: Applied in the production and processing of fertilizers, mineral powders, etc., with fine control over powder particle size to meet the process requirements of different chemical products.

Battery Industry: Used in the processing of lithium batteries, electrode sheets, etc., where the counter roll press helps press and form electrode materials, enhancing the uniformity of the electrode surface and improving battery performance.

Food and Pharmaceutical Industries: Used for processing specific powders or particulate materials, particularly those requiring precise control of particle size, such as pharmaceuticals and food additives.

New Materials Industry: With the rise of new material technologies, the roll press has found widespread application in areas such as graphene, nanomaterials, and ceramic composites, meeting the precise particle size requirements of these materials.

Application Case: 《Using the Precision Roll Press to Manufacture Battery Electrode Sheets》

Process Steps:

1. Material Preparation

Slurry Preparation: Mix active materials (such as positive electrode materials like NCM or lithium iron phosphate, or negative electrode materials like graphite), conductive agents (such as carbon black or conductive carbon nanotubes), and binders (such as PVDF) in specific proportions. Add a solvent (such as NMP) and stir until uniform to form a homogeneous slurry.

Mixing and Degassing: Use a vacuum mixer to stir the slurry, ensuring uniform material distribution, and remove any air bubbles using a degassing machine to ensure slurry stability and consistent coating.

2. Coating

Coating Machine: Apply the slurry evenly onto a copper foil (for negative electrodes) or aluminum foil (for positive electrodes), forming a uniform wet film layer. The coating thickness should be precisely controlled based on the required specifications and performance of the electrode sheet.

Drying: Dry the coated electrode sheets in an oven to remove the solvent, allowing the slurry to solidify and produce dry electrode sheets.

3. Roll Pressing

Setting Roll Press Parameters: Adjust the roller gap and pressure of the roll press based on the design requirements for the battery electrode sheet to ensure uniform thickness and desired density. Trial pressing is typically required, with gradual adjustments to the pressing parameters.

Roll Pressing: Press the dried electrode sheets through the counter roll press to compress them to the required thickness and density. This step improves the mechanical strength of the electrode sheet and optimizes battery performance.

Thickness and Density Testing: Measure the thickness and density of the pressed electrode sheets to ensure they meet the design specifications. If they do not meet the requirements, adjust the pressing parameters for secondary pressing.

4. Post-Processing

Cutting: Cut the roll-pressed electrode sheets into the desired size for battery assembly or winding.

Baking and Dehumidification: To ensure the electrode sheets meet the moisture requirements for battery assembly, bake the cut electrode sheets in a vacuum oven to remove moisture.

Electrode Sheet Testing: Test the pressed electrode sheets for thickness consistency, surface flatness, weight, and density to ensure battery performance and safety.

5. Winding or Stacking (Subsequent Processes)

Winding/Stacking: The electrode sheets, separator, and aluminum foil are wound or stacked according to the battery design to form the battery core, completing the electrode sheet manufacturing process before moving to the battery cell assembly phase.

Key Process Control Points:

Pressing Pressure Control: The pressure applied during the pressing process directly affects the thickness and density of the electrode sheet and must be precisely controlled based on the characteristics of different materials.

Roller Temperature Control: In some processes, roller heating may be required to improve material compaction, enhancing the electrode sheet's density and surface flatness.

Thickness Consistency: Use precision measurement equipment to monitor the thickness of the electrode sheets in real-time, ensuring consistency across batches for reliable battery assembly and performance.