Winding vs. Stacking in Power Batteries: Why is Stacking Technology Becoming the New Standard for High-End Lithium Batteries?

When you use a drone, you might not realize that a precise competition over energy density is underway within its lightweight body. As the “heart” of modern electronic devices, the internal construction process of lithium batteries directly determines their performance. Currently, mainstream battery cells can be divided into three types based on their shape: cylindrical, pouch, and prismatic. The key to their performance differences lies in the contest between two core manufacturing processes: “Winding” and “Stacking.”

Winding Process: Limitations of a Mature Technology
The winding process, commonly used in traditional cylindrical batteries, involves rolling up the negative electrode, separator, and positive electrode materials layer by layer, much like making a Swiss roll. Although this process is mature and efficient, it has inherent shortcomings. When applied to prismatic batteries, the four corners create unusable voids, leading to reduced space utilization and limited energy density. More notably, during charging and discharging, the electrode materials expand. In the wound structure, the uneven stress distribution between the inner and outer layers at the corners can easily cause wavy deformation. This not only affects the battery’s lifespan but also increases the risk of internal short circuits.

Stacking Process: A Breakthrough in Technological Advancement
In contrast, the stacking process is more like carefully layering a mille-feuille. It involves precisely cutting the positive and negative electrode sheets into rectangles and stacking them layer by layer, with the separator weaving between them in a Z-shape. This process maximizes the use of the battery’s internal space, increasing energy density by approximately 5% compared to the winding process. More importantly, the parallel stacking structure of each electrode sheet allows the battery to expand uniformly during charging and discharging, maintaining long-term internal structural stability. This significantly enhances cycle life and safety performance.

The Inevitable Choice of Technological Evolution
As the new energy industry’s requirements for battery performance continue to rise, the stacking process is demonstrating significant advantages. According to industry statistics, batteries using the stacking process generally achieve a cycle life increase of over 15% compared to those using the winding process. Furthermore, due to superior structural stability, the risk of thermal runaway is significantly reduced. These advantages are making stacking technology the preferred process for high-end power batteries.

Future Outlook
With advancements in process equipment and improvements in production efficiency, the cost of stacking technology is continuously being optimized. Industry experts predict that by 2025, the adoption rate of the stacking process in the high-end power battery field is expected to exceed 60%.

Choosing a battery is not just selecting an energy storage unit; it’s choosing a technological path. The stacking process represents the evolution of lithium batteries towards greater safety and efficiency—a true “stacking” generation upgrade. As the technology continues to mature, the stacking process is expected to become the new standard in the power battery field, injecting stronger momentum into the development of the new energy industry.

Winding vs. Stacking in Power Batteries: Why is Stacking Technology Becoming the New Standard for High-End Lithium Batteries?

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