Classification and Technological Evolution of Lithium Battery Coating Machines Diversified Routes Support the High Quality Development of the New Energy Industry

Upgrading of Lithium Battery Equipment: Classification and Technological Evolution of Lithium Battery coating machines

 Diversified Routes Support the High-Quality Development of the New Energy Industry

With the continuous expansion of the new energy vehicle and energy storage markets, lithium battery manufacturing equipment is experiencing a peak of technological iteration. As the core process equipment for electrode production, lithium battery Coaters directly determine the consistency, yield rate and production efficiency of electrodes, making their technical routes and equipment selection the focus of industry attention. At present, domestic coating machines have formed a product matrix of diversified types, high precision and high speed, fully covering the R&D and mass production needs of consumer batteries, power batteries, energy storage batteries and new-type batteries.

I. Main Types and Technical Characteristics of Coating Machines

According to coating principles and structures, the industry divides lithium battery coating machines into four mainstream categories, suitable for different process scenarios:

1. Slot Die Coating Machine

As the mainstream choice for power batteries, it adopts a closed die head to accurately extrude slurry, featuring high coating uniformity and stable surface density control. It enables high-speed, wide-width and double-sided synchronous coating, compatible with high-solid-content and high-viscosity slurries, meeting the mass production requirements of long-range, high-safety power batteries.

2. Transfer Coating Machine

Slurry coating is realized through a coating roller. It runs stably and is suitable for medium and low-speed production lines. It is mostly used in consumer lithium batteries and small- and medium-sized power cells. With moderate equipment cost and convenient maintenance, it is widely used in 3C digital battery fields.

3. Knife Coating Machine

Simple in structure and easy to adjust, it is commonly used for laboratory R&D, small-batch trial production and low-end consumer batteries. It offers medium thickness control accuracy, ideal for material formula verification and small-scale pilot lines.

4. Micro-Gravure / Gravure Coating Machine

Designed for ultra-thin coatings and high-precision scenarios, it delivers excellent coating uniformity and is compatible with new materials such as solid-state electrolytes, silicon-based anodes and composite current collectors, making it key equipment for next-generation batteries.

In addition, coating machines are divided into single-sided and double-sided coaters by coating surface, and intermittent and continuous coaters by operation mode, to meet different process cycles and electrode design requirements.

II. Technological Iteration: Parallel Development of High Speed, High Precision and Intelligence

According to the China Association of Chemical and Physical Power Sources, domestic coating machines have achieved key breakthroughs: coating speed exceeds 100 m/min, surface density accuracy is better than ±1.5%, and coating width ranges from 300 to 1400 mm. Equipment from leading enterprises has entered the supply chains of the world’s top battery manufacturers.

In recent years, equipment has been upgraded toward high speed, double-sided, intelligence and low carbon: double-sided slot die coating reduces unwinding and rewinding losses; AI online thickness measurement and closed-loop control improve yield rates; energy-saving ovens reduce power consumption; and the machines adapt to diverse cell processes such as large cylindrical, blade and square laminated cells. Meanwhile, dedicated coating solutions have been launched for solid-state batteries and sodium-ion batteries, supporting the industrialization of cutting-edge technologies.

III. Industrial Application: Diversified Routes and Accelerated Domestic Substitution

Power battery production lines mainly adopt slot die coating, emphasizing high speed, high consistency and high yield; consumer batteries mainly use transfer coating, balancing cost and stability; R&D institutions and material enterprises select knife coaters, micro-gravure coaters and other equipment for testing.

With the performance improvement of domestic equipment, the localization rate of coating machines has risen sharply. Enterprises including Lead Intelligent, Yinghe Technology, Jiatuo Intelligent and Xinyuren have realized large-scale delivery, breaking foreign dependence and continuously enhancing equipment export and global supporting capabilities. Industry insiders noted that continuous progress in coating technology will further reduce lithium battery manufacturing costs and improve the independent controllability of the industrial chain.

IV. Future Trends: Equipment Innovation Driven by New-Type Batteries

Facing new technologies such as solid-state, semi-solid-state, sodium-ion batteries and composite current collectors, coating machines are evolving toward ultra-thin coatings, multi-layer lamination, solvent-free/dry coating and full-process digitalization. GGII predicted that the demand for high-precision coating equipment compatible with new materials will grow faster than the industry average in the next three years, becoming the core of competition among equipment manufacturers.