16 channels Hot Pressing Machine for Lithium Pouch Cell Sei Formation

The Hot Pressing Machine is an equipment used for powder material forming (such as metal powder, ceramic powder, composite materials, etc.) under high temperature and pressure. This equipment is commonly used to manufacture materials with high density, uniform structure, good mechanical properties, and specific electrical properties. The hot pressing process combines heating and pressure to effectively improve powder density, significantly reduce porosity, and enhance the overall material performance.

Product Description:

This equipment is a 16-channel hot pressing machine for batteries with double-ended lugs. It adopts a horizontal structure with a single pressing unit, featuring 16 layers of pressing plates, each layer capable of holding one battery, making a total of 16 channels. The machine is primarily used for the hot pressing formation of soft-pack lithium-ion batteries. It can replace the traditional battery formation process with an oven shaping process, shortening formation time, reducing the battery production cycle, minimizing labor, and achieving smoother surfaces and better aesthetics of the battery after vacuum sealing. It also completes both the formation and hot pressing shaping of the battery.

Product Features:

Horizontal single-station design with multi-channel stacking, offering flexible use.

Multi-stage heating and pressing formation, with independently adjustable temperature and pressure for each stage.

High-precision flat heaters with good temperature uniformity, long service life, and adjustable temperature.

Cylinder-driven with adjustable pressure; the pressing plates are specially treated for high precision and minimal thermal deformation.

Specialized positive and negative terminal clamping design for stable contact, equipped with an 8-channel battery analyzer (brand options available).

PLC control with HMI operation, designed with various safety protection functions.

Purchase Information:

If you are interested in our Hot Pressing Machine, please feel free to contact us for more information and a quotation.

Phone: +86 18516380382

Email: Jimmy@cysitech.com

Contact Person: Jimmy Hao

WeChat: +86 18516380382

WhatsApp: +86 13939946898

Technical Specifications:

Main Components:

Application Areas:

Metal and Alloys: Manufacturing high-density metal parts such as powder metallurgy components, magnetic materials, battery electrodes, etc.

Ceramic Materials: Production of dense ceramic parts such as ceramic substrates for electronic devices and hard ceramic cutting tools.

Composite Materials: Suitable for manufacturing high-performance composite materials, such as high-strength composites used in aerospace and automotive industries.

Magnetic Materials: Widely used in manufacturing permanent magnet materials, ferrite materials, etc., for electronic devices and sensors.

High-Performance Functional Materials: Materials such as high-temperature superconductors, piezoelectric ceramics, etc., used in modern electronics and energy industries.

Application Case:《Using the Hot Pressing Machine for Pressing Soft-Pack Lithium-Ion Batteries》

Process Steps:

1. Material Preparation:

Positive Electrode Materials: Common materials include ternary materials (e.g., nickel-cobalt-manganese, nickel-cobalt-aluminum) or lithium iron phosphate (LiFePO₄). These materials need to be evenly mixed and pretreated (such as drying) if necessary.

Negative Electrode Materials: Common materials are graphite or silicon-based materials, also requiring uniform mixing.

Electrolyte: A suitable electrolyte (e.g., organic solvent containing lithium salt) is chosen, ensuring it does not evaporate during the hot pressing process.

Separator: Polyolefin-based separators (such as PE, PP separators) are used to ensure good ion conductivity.

Aluminum and Copper Foil: Used as current collectors for positive and negative electrodes, respectively.

2. Mixing and Coating:

Mixing: The positive and negative active materials, conductive additives, binders, and solvents are mixed in specific ratios to form a slurry. The slurry is then mixed under high shear to ensure uniformity.

Coating: The mixed slurry is coated onto aluminum foil (for the positive electrode) and copper foil (for the negative electrode). The coating thickness is typically based on the battery's capacity requirements, ranging from tens to hundreds of microns.

Drying: The coated electrodes are dried to remove solvents, ensuring they meet the required dryness.

3. Stacking and Assembly:

Cutting and Stacking: The dried positive and negative electrodes are cut into the required shape and size and stacked together with an appropriate separator.

Packaging: The battery stack, separator, and electrolyte are placed into a soft-pack aluminum-plastic film. The soft-pack film, composed of aluminum foil and plastic film, offers good airtightness and mechanical strength. This step starts to form the battery's outer shape.

4. Hot Pressing Forming:

Placing into the Hot Pressing Machine: The stacked battery is placed into the mold of the hot pressing machine. The appropriate temperature, pressure, and time are selected based on the battery's size and requirements.

Heating and Pressing: The hot pressing machine is activated, applying heat (typically between 150-200°C) and pressure (usually ranging from tens to hundreds of MPa). The hot pressing process allows the materials in the electrode sheets to bond tightly, removing excess bubbles and voids, thereby increasing the battery's density.

Pressure Control: The pressure is maintained at several tens of MPa, ensuring the tight binding of the internal materials.

Temperature Control: The temperature for hot pressing is set based on the material requirements, as excessive heat can affect battery performance, while insufficient heat may not achieve the desired density.

Time Control: The hot pressing time is typically a few minutes, with adjustments based on the battery's size and material used.

5. Cooling and Sealing:

Cooling: After the hot pressing process, the battery is gradually cooled in a controlled environment to prevent structural damage from rapid cooling.

Sealing: The edges of the soft-pack aluminum-plastic film are sealed to ensure no air enters the battery. The sealing process ensures the integrity and airtightness of the battery, preventing electrolyte leakage.

6. Electrolyte Injection and Sealing:

Injecting Electrolyte: After hot pressing, the electrolyte is injected into the battery, ensuring uniform distribution between the positive and negative electrodes' separators. The liquid volume is carefully controlled to avoid excessive or insufficient electrolyte, which can impact performance.

Sealing: The battery is further sealed to ensure its airtightness and safety. Common sealing methods include heat sealing and ultrasonic sealing.

7. Initial Charging and Activation:

Initial Charging: After electrolyte injection and sealing, the battery undergoes an initial charge. This is usually done with low current to ensure proper charge and discharge functionality.

Testing and Quality Control: The battery's performance (capacity, internal resistance, cycle stability, etc.) is tested to ensure it meets the required specifications.

8. Inspection and Packaging:

Performance Testing: The battery is tested for voltage, capacity, internal resistance, and other electrical performance metrics to ensure it meets the design specifications.

Packaging: The qualified batteries are then packaged and prepared for shipment.