Battery Heated Roller Press Guide

1、What is a battery heated roller press？

The battery heated rolling press is a precision equipment specially designed for the processing of lithium battery electrode sheets, integrating heating and rolling functions. After the coating process of lithium battery electrode sheets is completed, they need to undergo rolling treatment to further optimize their performance, and the battery heatedrolling machine is precisely the core equipment for achieving this crucial step.

Structurally speaking, the battery heated roller press is mainly composed of five major systems. The rolling system is the core of the equipment, usually composed of one or more pairs of rolls. The material of the rolls directly affects the rolling effect. For example, alloy steel rolls have strong wear resistance and high strength, and are suitable for the rolling of conventional electrode sheets. Ceramic rolls, with their excellent corrosion resistance and surface finish, perform outstandingly when processing electrode plates with extremely high surface quality requirements. The heating system is the key that distinguishes it from ordinary roller presses. Common heating methods include electric heating, oil heating and steam heating. Electric heating features rapid temperature rise and precise temperature control, and can quickly respond to changes in process parameters. The oil heating has good temperature uniformity and strong thermal stability, making it suitable for production scenarios with high requirements for temperature consistency. Although steam heating has a relatively low cost, its temperature control is relatively complex and it is still applied in large-scale manufacturing enterprises. The transmission system drives the rolls to rotate at a constant speed through components such as motors and reducers, ensuring that the electrode sheets are subjected to uniform force during the rolling process. As the "brain" of the equipment, the control system uses sensors to monitor key parameters such as roller pressure, temperature and speed in real time, and automatically adjusts according to the preset process to ensure the stability of the production process. In addition, the safety protection system provides all-round safety guarantees for the operation of the equipment and the operators.

During the working process, the coated electrode sheet is conveyed into the rolling area by the conveying device. Under the combined action of the pressure applied by the rolls and the heat provided by the heating system, the bonding force between the electrode material particles within the electrode sheet and between the electrode material and the current collector is significantly enhanced, the porosity is reduced, and the density and strength are greatly increased. This process not only improves the physical properties of the electrode sheet but also optimizes its electrochemical performance, laying a solid foundation for the subsequent assembly and performance of lithium batteries.

2、The core value of battery roller press in lithium battery production

Energy density is a core indicator for evaluating the performance of lithium batteries, directly determining the driving range of electric vehicles and the power storage capacity of energy storage devices. The battery heated roller press, through precise roller pressing, can significantly increase the electrode density, thereby greatly enhancing the energy density without changing the battery volume. Take lithium iron phosphate batteries as an example. The electrode sheets that have undergone heated rolling treatment can increase their energy density by 15% to 20%, effectively addressing the range anxiety of electric vehicles and promoting the development of the new energy vehicle industry.

(2) Optimize the quality of electrode sheets to ensure the stability and lifespan of the battery

Good electrode sheet quality is the foundation for the stable operation of lithium batteries. The battery heated roller press, by precisely controlling the roller pressure and temperature, makes the surface of the electrode sheet flatter and smoother, reduces surface defects, and lowers the risk of internal short circuits in the battery. Meanwhile, the rolling process enhances the conductivity between the electrode material particles, reduces the electrode resistance, and improves the charging and discharging efficiency and cycle life of lithium batteries. Data shows that the resistance value of the electrode sheets treated by heated rolling can be reduced by 10% to 15%, significantly enhancing the overall performance and service life of lithium batteries.

(3) Achieve high efficiency and stability in large-scale production

In the large-scale production of lithium batteries, the stability of equipment and production efficiency are of vital importance. The battery heated roller press, with its high-precision control system and automation functions, can achieve continuous and stable production, effectively reducing the interference of human factors, ensuring that each electrode sheet is processed under the same technological conditions, improving the consistency of product quality, helping enterprises achieve large-scale and standardized production, reducing production costs, and enhancing market competitiveness.

3、How to choose a battery heated roller press?

(1) Clarify production requirements

When enterprises choose battery heated roll presses, they need to start from their own production reality and clarify four core demands:

Production scale: For large-scale production enterprises with an annual output of over 10 million pieces, large-scale equipment with a roll width of more than 800mm and high-speed continuous production capabilities should be selected. Enterprises with lower annual output can choose medium and small-sized equipment with a rolling width of 300-600mm to avoid resource waste caused by overcapacity.

Electrode sheet specification: Select the appropriate equipment based on the size and thickness of the electrode sheet. Large-sized electrode plates (with a length exceeding 1m and a width exceeding 600mm) have higher requirements for the load-bearing capacity of the equipment's roller pressing platform and transmission system. In production scenarios where the thickness of the electrode sheets varies greatly, the equipment needs to have a wide range of pressure regulation capabilities to achieve precise compaction of electrode sheets of different thicknesses.

Electrode sheet material: The requirements for roller pressing conditions of electrode sheets made of different materials vary significantly. The conventional rolling conditions for graphite anode materials can meet the requirements. However, due to the large expansion coefficient of silicon-carbon anode materials, ceramic rollers should be selected, and the pressure should be controlled at 2-4 mpa and the temperature maintained at 100-150 ℃. At the same time, the equipment is required to have higher temperature and pressure control accuracy to prevent the electrode sheet from cracking or powder dropping.

Production process: The lamination process has extremely high requirements for the flatness of the electrode sheet. It is necessary to select equipment equipped with a high-precision roller pressing system and an automatic deviation correction device. The winding process places more emphasis on production speed and stability. A heated roller press with automatic tension control function is a better choice, which can effectively prevent the electrode sheet from wrinkling or breaking during the winding process.

(2) Focus on equipment performance

Rolling pressure range: The pressure range of conventional equipment is 1-10 mpa, and some high-end equipment can reach 15MPa to meet the production requirements of high-pressure solid-density electrode sheets. Enterprises can evaluate the stability and accuracy of pressure output by referring to the pressure test curve in the equipment manual.

Temperature control accuracy: For temperature-sensitive materials, a temperature control accuracy of ±1℃ is a basic requirement. The supplier can be requested to provide a temperature uniformity test report to check the temperature differences at different positions on the surface of the rolls. The smaller the differences, the better the temperature control performance.

Rolling speed: Under the premise of ensuring the rolling quality, the rolling speed directly affects the production efficiency. However, it should be noted that excessive speed may lead to uneven compaction of the electrode sheets. It is recommended to observe the roller pressing effect of the electrode sheets under high-speed operation through the supplier's trial machine video or on-site inspection.

The Heatable Roller Press Machine, as the core equipment for lithium battery production, its performance and selection are directly related to the production quality, efficiency and market competitiveness of enterprises. By making comprehensive choices from multiple dimensions such as clarifying production requirements, evaluating equipment performance, considering the levels of automation and intelligence, attaching importance to after-sales service, and weighing cost-effectiveness, enterprises can purchase the battery heated roller press that best suits their own development.