Pouch Battery Insulation Tape with Cutting Portion
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Solution Overview
Problem
Pouch-type rechargeable batteries face issues with insulation tape adhesion due to position tolerance of the lead tab, leading to potential short circuits and deteriorated insulation performance.
Innovation Solution
The use of an insulation tape with a cutting portion that corresponds to the tab seal, absorbing the position tolerance of the lead tab and tightly adhering to the terrace side end, ensuring effective insulation and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulation tape is adhered to insulate the sealing portion and terrace, then insulation performance is improved, but position tolerance of the lead tab causes poor adhesion and potential short circuits
Solution Approach 1:
The insulation tape is designed with a cutting portion at a specific location to correspond to the tab seal position. This local modification allows the tape to adapt to position tolerance variations of the lead tab while maintaining proper adhesion and insulation performance in other areas.
Solution Approach 2:
The insulation tape is effectively segmented by the cutting portion, creating distinct regions: an first portion for insulating the sealing portion, a cutting portion to accommodate tab seal position variations, and a second portion for insulating the terrace. This segmentation allows each region to perform its specific function independently.
2Strength
If the insulation tape is adhered tightly to ensure good adhesion, then adhesion performance is improved, but position tolerance of the lead tab prevents tight adhesion
Solution Approach 1:
The cutting portion creates a local adaptation zone that accommodates position tolerance variations. This allows the majority of the insulation tape to maintain tight adhesion to the sealing portion and terrace, ensuring strong overall adhesion while locally compensating for positioning variations.
3Reliability
If the insulation tape covers the entire terrace area, then insulation coverage is improved, but the lead tab position tolerance causes exposure and short circuit risks
Solution Approach 1:
Rather than uniformly covering the entire terrace area, the insulation tape is locally modified with a cutting portion that corresponds to the tab seal position. This creates an adaptive coverage pattern that ensures the lead tab remains insulated regardless of position tolerance variations, while avoiding unnecessary coverage that would complicate the structure.
4Manufacturing precision
If the insulation tape is made wider to cover position variations, then position tolerance coverage is improved, but device complexity and material usage increase
Solution Approach 1:
Instead of using a single wide insulation tape that would increase complexity, the tape is segmented with a cutting portion. This segmentation allows the tape to effectively cover position tolerance variations through its adapted configuration rather than through increased width, maintaining simplicity while achieving the coverage goal.
Data Source
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AI summary
A pouch type rechargeable battery insulates a terrace side end (a metal portion) and tightly adheres an insulation tape by adhering the insulation tape while absorbing a position tolerance of a lead tab (or a tab seal) on a terrace. The pouch type rechargeable battery includes: an electrode assembly (10); a pouch (20) forming a sealing portion (212) at a side surface of a cell body (211) receiving the electrode assembly (10) by sealing an outer portion thereof, forming a terrace (213) at the other side surface of the cell body (211), and sealing a lead tab (14, 15) connected to the electrode assembly (10) by a tab seal (18, 19) to draw it out to the terrace (213); and an insulation tape (30) that insulates the sealing portion (212) to be adhered to the cell body (211) and insulating the terrace (213). The insulation tape (30) includes a cutting portion (33) corresponding to and adhered to one side of the tab seal (18, 19).