News

The process of battery manufacturing comprises several steps, each being essential for quality and performance. In particular, battery formation is important during the inspection, which is crucial for fault detection, cell capacity, uniformity, and even overall battery performance. (Copyright photo from: https://www.freepik.com/free-photo/top-view-recycled-batteries_27595704.htm#fromView=image_search_similar&page=2&position=38&uuid=4713abcf-36fe-47d3-a658-5096dd95480a) What Is Battery Formation? Battery formation is about conditioning newly manufactured batteries. It includes controlled charging and discharging cycles to stabilize the electrode materials and form a solid electrolyte interphase layer for battery performance. During this stage, precise voltage and current control helps avoid defects and gives uniform SEI (Solid Electrolyte Interphase) formation. It prevents electrolyte decomposition and boosts cycle life. Furthermore, temperature management avoids thermal runaway. For example, formation may involve initial charging to 80% capacity for lithium-ion batteries. It is followed by rest periods and low-rate cycling to adjust SEI characteristics, which can span many days. Technologies and Their Significance Behind Battery Formation 1. Electrolyte Filling In the battery formation process, precise electrolyte filling is key. High-precision dispensing systems guarantee uniform distribution of the electrolyte across all cells. They employ volumetric pumps, gravity-assisted fill techniques, and vacuum-assisted filling to eradicate air pockets, which can impede ionic movement for lower efficiency. Besides, electrolyte compatibility with electrode materials must prevent unwanted chemical reactions. For example, in lithium-ion batteries, the electrolyte may comprise a lithium salt (LiPF6) in a mixture of organic solvents. Control over the concentration and purity helps keep optimal ionic conductivity and curtail degradation. 2. Initial Charge and SEI Formation Forming the solid electrolyte interphase layer is vital, as it inhibits further decomposition of the electrolyte and allows lithium-ion transfer. During the initial charge, charging protocols might include multiple low-rate charging/discharging cycles for a uniform SEI. And the initial charge may also require temperatures to be regulated within a tight range for controlled SEI growth. In-situ electrochemical impedance spectroscopy

As the world moves decisively towards sustainability, the automotive industry is undergoing a transformation with electric vehicles (EVs) at the forefront. This shift is not only about the vehicles themselves but also about the heart of their operation—the EV batteries that power them. In 2023, the global demand for EV batteries surged by an impressive 40%, exceeding 750 GWh[1], with the majority of this demand driven by an uptick in electric vehicle sales. This increase is a clear indicator of a broader trend that is reshaping the energy and automotive landscapes across the globe. Regions like the United States, Europe, and China are leading this charge, not just in terms of EV sales but also through their contributions to the EV battery market. These areas have become critical hubs for battery production, closely aligning manufacturing capacity with market demand. However, with great demand comes the great responsibility of meeting it efficiently and sustainably. This is where digital assembly lines for battery manufacturing come into play. Traditional battery manufacturing processes are being revolutionized by the integration of digital technologies. The adoption of digital assembly lines in battery production promises not only to meet the growing demand more efficiently but also to elevate the production process to new heights of precision and productivity. Let’s see! Current Situation of EV Batteries in Mainstream Areas The current situation of the EV battery market in the mainstream regions of the United States, European Union, and China showcases varied levels of market penetration, production capabilities, and overall market size. By taking data from 2023, it reflects different stages of EV adoption and industry development. 1. United States In the United States, the EV market is progressively establishing itself. As of 2023, the U.S. produced around 70 GWh of EV batteries[2], indicating a developing capacity that is beginning to

Batteries, especially those placed in electric vehicles (EVs), renewable energy storage, and portable electronics, demand intricate and reliable assembly processes. EV battery components such as electrodes, separators, and current collectors must be accurately shaped and assembled to ensure optimal performance and safety. This is why laser manufacturing comes in. Laser manufacturing is a process that utilizes laser technology to perform various manufacturing operations. But how does it empower battery assembly in detail? To understand this technology comprehensively for battery assembly, please continue reading! (Copyright Photo from: https://www.freepik.com/free-photo/safety-measures-stickers-assembly-lines-operated-by-heavy-machinery-render_147665123.htm#fromView=search&page=1&position=1&uuid=4abd6006-ee41-43c4-ba22-d17f578ab848) Different Laser Technology Approaches are Used in Battery Manufacturing The following are some laser technology approaches that are used in the battery assembly or manufacturing process. I used a laser beam to cut the different components of the battery precisely. The laser cut electrodes, separators, and casings with high precision and minimal material waste. 1. Fiber Lasers Fiber lasers are widely used in battery manufacturing for various applications such as cleaning, texturing, welding, and marking battery components[1]. They offer a high level of precision and can be optimized to meet different production requirements. 2. Diode Lasers Diode lasers are used for efficient drying processes in battery manufacturing. By projecting a high-intensity beam onto the electrode, the diode laser heats up the graphite particles, causing the liquid to evaporate[2]. This laser manufacturing method is energy-efficient and takes up less space compared to traditional gas-powered continuous furnaces. 3. Ultrashort Pulse Lasers (USP) Ultrashort pulse lasers are utilized for modifying electrode structures in battery manufacturing. By introducing hole structures or channels into the battery electrode, the distance the ions have to travel is reduced, resulting in shorter charging times and increased battery lifetime[2]. The short interaction time of the laser pulses prevents the holes from melting, ensuring the battery does not lose power. 4. Near-IR Fiber Lasers Near-IR fiber

On the market, there are two common lithium-ion batteries: cylindrical cells and prismatic cells. Each type has unique characteristics and is used in various applications with different industry requirements for size, shape, energy density, and performance. The following content will help you learn about these when comparing prismatic vs cylindrical cells. Let’s dive in! Prismatic VS Cylindrical Cells in Appearance Both cells serve different purposes, so their appearance is also different in shape and size. Features Prismatic Cells Cylindrical Cells Shape Rectangular or square Always in Cylindrical Size Varied, but always with larger footprints and thinner Standardized sizes, like 18650 and 21700 Construction Encased in hard or soft shell by plastic or metal Encased in metal outer layer with safety vent Terminals Flat terminals or tabs on one or both sides Positive terminal on top, negative terminal on bottom Prismatic VS Cylindrical Cell in Performance 1. Density Both cells have different energy densities. Talking specifically, here are the details on density comparison on prismatic VS cylindrical cells: Prismatic Cells: Prismatic cells have a larger size, allowing them to contain more energy per cell compared to cylindrical cells. A single prismatic cell can hold the same amount of energy as 20 to 100 cylindrical cells[1]. This higher energy density makes prismatic cells suitable for energy-intensive applications. Cylindrical Cells: Cylindrical cells are smaller in size compared to prismatic cells. While they may store less energy per cell, they have a higher power output. Cylindrical cells can discharge their energy faster than prismatic cells due to having more connections per amp-hour[1]. This makes cylindrical cells ideal for high-performance applications 2. Longevity Prismatic Cells: Typically, a prismatic cell can sustain about 2,000 charge-discharge cycles[2] before its capacity begins to significantly degrade. However, the real advantage of prismatic cells becomes apparent when they are assembled

From June 18 to 20, 2024, The Battery Show Europe 2024, a globally anticipated event, grandly opened in Stuttgart, Germany. As a leading enterprise in the field of intelligent manufacturing of battery equipment, SZJ took this opportunity to showcase its latest innovations in battery equipment technology and product solutions, once again demonstrating its strong capabilities in the global battery manufacturing sector. Technological Exhibition, Showcases Strength At the exhibition, SZJ focused on a complete production line model for prismatic cells. This model fully displays the entire production process from material handling, cell manufacturing, and cell assembly to final testing. It not only highlights technological advantages in prismatic cell manufacturing but also allows visitors to intuitively experience meticulous craftsmanship.The booth attracted a large crowd, with industry experts and visitors stopping by to inquire, giving high praise to the technological innovations. Comprehensive Layout, Leading Technology in Multiple Fields In addition to the prismatic cells production line model, technological prowess in the production equipment for large cylindrical cells, small cylindrical cells, and pouch cells was equally impressive. Particularly noteworthy is the automated production line for large cylindrical cells, where SZJ has earned high recognition in the industry with its efficient grooving and laser sealing solutions, integrated with high-efficiency transmission, precise forming, and automatic welding technologies. This production line boasts a single-line capacity of up to 350 PPM with a yield rate exceeding 99.5%, showcasing the company’s leading position in the industry. Looking Ahead, Continuing to Forge Ahead SZJ’s continuous innovation and leading technology in the field of intelligent manufacturing of battery equipment not only provide strong support for the development of the global battery industry but also lay a solid foundation for the company’s future development. Looking ahead, SZJ will continue to increase investment in research and development, promote technological innovation and product upgrades, and contribute more