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Screen printing has become an indispensable core technology in the new energy battery industry, leveraging its advantages of low-cost mass production, high material adaptability, and precise pattern deposition. It plays a crucial role in optimizing battery performance, reducing manufacturing costs, and promoting the industrialization of emerging battery technologies. From photovoltaic cells to lithium-ion batteries and flexible micro-batteries, screen printing provides reliable manufacturing support for various new energy battery types. This article explores typical application cases of screen printing in the new energy battery field and presents relevant Q&A to deepen understanding.
1. Photovoltaic Battery Electrodes: Precision Printing for Efficiency Improvement
Screen printing is the most critical process in photovoltaic cell production, primarily used for forming positive and negative electrodes on the cell surface. The precision of electrode printing directly affects the photoelectric conversion efficiency and reliability of photovoltaic batteries. With the continuous pursuit of higher efficiency in the photovoltaic industry, screen printing technology has evolved toward ultra-fine line width and high-precision control.
A typical case is the ultra-precision screen printing solution developed by Kunshan Liangpin Screen Printing Equipment Co., Ltd. for photovoltaic battery manufacturers. The company has achieved a minimum printing precision of 8.5 microns, leading the industry. Through cooperation with Taiyuan University of Technology, they optimized the traditional 11-micron wire diameter technical route to 9 microns, breaking the long-term technical monopoly of international giants. This improvement effectively reduces the blockage at the overlap of fine grids and mesh knots, which often occurs when the mainstream front grid line width is 25-28 microns. As a result, the photoelectric conversion efficiency of photovoltaic cells is significantly enhanced while production costs are reduced. Currently, the company operates 30 laser cutting equipment, with a monthly output of approximately 10,000 ultra-precision fine-line printing screens, fully meeting the large-scale production needs of photovoltaic enterprises.
2. Lithium-Ion Battery Electrodes: Enabling Fast Charging Performance
In lithium-ion battery manufacturing, screen printing is widely used for electrode preparation, especially in the development of fast-charging batteries. Traditional electrode preparation methods often struggle to balance high production efficiency and excellent electrochemical performance. Screen printing, particularly roll-to-roll screen printing, solves this problem by enabling large-scale production of low-tortuosity electrode structures that facilitate rapid ion diffusion.
A notable research case comes from the team of Professor Zhu Hongli at Northeastern University in the United States. They pioneered the application of screen printing technology to fabricate lithium-ion battery electrodes with fast-charging capabilities. The key innovation lies in optimizing the ink preparation process to obtain inks with untwisted molecular chains. This approach ensures uniform dispersion of components even at a high solid content of 60%, significantly improving ink printability. The screen-printed electrodes exhibit excellent rheological properties and rapid thixotropic recovery, with a full recovery time of only 36 seconds after high-shear rate treatment. Electrochemical tests show that these electrodes achieve superior rate performance and long-cycle stability, laying a foundation for the industrial production of fast-charging lithium-ion batteries using screen printing.
3. Flexible Zinc-Manganese Micro-Batteries: Low-Cost Mass Production
With the development of miniaturized and wearable electronic devices, there is an urgent demand for flexible, safe, and long-life micro-energy storage devices. Screen printing has emerged as an ideal manufacturing technology for such devices due to its ability to print on diverse flexible substrates and realize low-cost mass production.
The research team led by Researcher Wu Zhongshuai from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, successfully fabricated high-flexibility, high-safety, and long-life secondary aqueous planar zinc-manganese micro-batteries using screen printing. They first prepared thixotropic inks for the positive and negative electrodes of zinc-manganese batteries and graphene current collectors using manganese dioxide, zinc powder, and graphene as functional materials. Through multi-step screen printing, they achieved low-cost and large-scale preparation of planar zinc-manganese micro-batteries. These batteries not only exhibit environmental friendliness and high safety but also have an ultra-long service life. The diversity of printing substrates also allows them to meet the needs of different application scenarios, providing a reliable power source for wearable electronic devices.
Q&A Related to Screen Printing in New Energy Battery Field
Q1: What are the core advantages of screen printing in new energy battery production compared to other electrode preparation technologies?
A1: Screen printing has three core advantages in this field. First, it enables low-cost mass production with simple process flow and high production efficiency, which is essential for meeting the large-scale demand of the new energy battery industry. Second, it has strong substrate adaptability, capable of printing on rigid substrates such as photovoltaic cell wafers and flexible substrates like polymer films, supporting the development of various battery types including flexible batteries. Third, it can achieve precise control of electrode patterns and thickness, which helps optimize the structure of battery electrodes, improve photoelectric conversion efficiency or electrochemical performance, and reduce material waste.
Q2: What key factors need to be considered when formulating screen printing inks for new energy batteries?
A2: Several key factors must be considered. First is the rheological properties of the ink, which directly affect printability. Inks need appropriate viscosity and thixotropic recovery capabilities to ensure smooth passage through the screen mesh and uniform deposition on the substrate. Second is the compatibility of ink components, including the uniform dispersion of active materials, conductive additives, and binders, to guarantee the electrical conductivity and mechanical stability of the printed electrodes. Third is the electrochemical performance of the ink, which should not adversely affect the battery's energy density, cycle life, or safety. Finally, environmental friendliness and cost-effectiveness are also important, requiring inks to comply with environmental regulations and control production costs.
Q3: What development trends will screen printing technology show in adapting to the future development of the new energy battery industry?
A3: The future development will focus on three directions. First, ultra-precision printing will be further promoted, with continuous reductions in electrode line width to meet the demand for higher efficiency and energy density of new energy batteries. Second, intelligent upgrading will accelerate, integrating AI and machine vision technologies for real-time monitoring of printing quality and defect detection, improving production yield and stability. Third, the integration with emerging battery technologies will be strengthened, such as adapting to the manufacturing needs of solid-state batteries and sodium-ion batteries through ink formula optimization and process improvement. Additionally, environmentally friendly inks and processes will be more widely adopted to align with the industry's low-carbon development goals.
