Building upon our previous article on polymer films for tabs in lithium-ion batteries, this sequel delves deeper into additional parameters that deserve consideration in the context of practical applications. Understanding these factors is crucial for optimizing the performance and functionality of tabs and pouch cells.

The polymer, film plays a crucial role as a barrier between the internal and external components of the pouch cell. Tab specifications often distinguish between short and long tab lengths, with the shorter section, typically a few millimeters, located within the pouch. Both sections should be of sufficient length to accommodate welding joints, especially when the outside section requires bending.

The width of the film is directly dependent on the width of the pouch cell’s edge. It is essential for the film to provide complete coverage over the metal at this juncture, as the metal may not properly bind with the pouch film, potentially leading to short-circuits. The width should be at least equal to, and preferably slightly greater than, the rim to allow for a safe margin.

During the heat-sealing process, the film will undergo thermal expansion. This expansion slightly affects the peel strength, which is influenced by the actual area adhered to the metal. Another consideration is the reduction of effective length on the shorter side for welding purposes, particularly when a minimal margin is specified. Aesthetics also come into play, as the sealing edges should appear clean and professional. Optimizing operating parameters on the production line can help achieve this desired outcome.

The length and width of the film directly impact the material cost of the tab. Similar to how films wrap around the metal edges to ensure complete sealing, the ends of the tab serve the same purpose by allowing the pouch film to seal around the tab. It is advisable to leave a sufficient length of film on the sides of the tab to facilitate this process.

Factors such as melting point, flexibility, and opacity are important considerations when selecting polymer films. Different types of films exhibit varying properties, and the optimal choice depends on the specific application and processing equipment employed.

In conclusion, the role of polymer tape as a critical component in tab construction cannot be overstated. It requires meticulous attention and consideration. At Avocet Battery Materials, we possess the expertise and capabilities to conduct extensive research and manufacture tabs tailored to meet your specific requirements.

To learn more about our comprehensive range of products and services, and how we can assist you in your battery applications, please visit