Pouch Battery Insulation Tape Segmentation for Sealing Adhesion
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Solution Overview
Problem
Pouch-type rechargeable batteries face challenges with adhesion and insulation performance at the sealing portion, particularly due to the spring back phenomenon near the short circuit check hole, which deteriorates insulation and increases the risk of short circuits.
Innovation Solution
The use of an insulation tape with specific portions and bends to adhere to both sides of the sealing and terrace portions, including a wide and narrow width configuration, to enhance adhesion and insulation performance, while maintaining a short circuit check hole for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple insulation tape is used at the sealing portion, then the device complexity is reduced, but the insulation performance deteriorates due to spring back phenomenon near the short circuit check hole
Solution Approach 1:
The insulation tape is divided into multiple segments: a first insulation tape covering the sealing portion, a second insulation tape covering the terrace end, and a third insulation tape connecting them. This segmentation allows each tape to be optimized for its specific location, preventing spring back at critical points while maintaining overall simplicity
Solution Approach 2:
The third insulation tape acts as an intermediary element that connects the first and second insulation tapes, ensuring continuous insulation coverage across the terrace end and sealing portion interface, thereby eliminating insulation gaps without requiring a completely complex single-piece design
2Strength
If the insulation tape is made wider to improve adhesion at the terrace end, then the adhesion performance is improved, but the device complexity increases due to bending requirements
Solution Approach 1:
Rather than using one wide complex tape, the solution segments the insulation into three narrower tapes that can be independently applied and bent. The third insulation tape is bent at a predetermined angle to follow the terrace geometry, providing adequate adhesion without requiring excessive width or complex single-piece configuration
Solution Approach 2:
The third insulation tape is bent at a predetermined angle to conform to the terrace geometry. This curvature allows the tape to adhere properly to the angled terrace surface, providing sufficient adhesion performance without requiring the tape to be excessively wide or complex in design
Data Source
AI summary
A pouch-type rechargeable battery includes an electrode assembly performing charging and discharging, a pouch forming a sealing portion at a side surface of a cell body receiving the electrode assembly by sealing an outer portion thereof and forming a terrace drawing out a first lead tab and a second lead tab connected to the electrode assembly at the other side surface of the cell body, and an insulation tape insulating the sealing portion from the cell body and including a short circuit check hole adjacent to the end of the terrace. The insulation tape insulates both side ends of the end.