Pouch Cell Cover Tape Layout to Prevent Adhesive Exposure
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Solution Overview
Problem
Existing secondary batteries face issues with adhesive exposure during manufacturing and use, leading to reduced assemblability, productivity, and potential defects in external devices due to adhesive exposure on the outer surface of the battery cell.
Innovation Solution
A cover tape with varying adhesive forces is applied to the battery cell, including a base area with a strong adhesive, dot areas with intermediate adhesive force, and finishing areas with no adhesive, to prevent adhesive exposure and enhance manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform adhesive is applied across the entire cover tape, then the cover tape can be easily manufactured, but adhesive may be exposed on the outer surface of the battery cell
Solution Approach 1:
The patent applies different adhesive properties to different regions of the cover tape. The first region has adhesive with first adhesive properties, the second region has adhesive with second adhesive properties (different from the first), and the third region has no adhesive. This local differentiation prevents adhesive exposure while maintaining manufacturing feasibility.
Solution Approach 2:
The cover tape is segmented into three distinct regions along the width direction: a first region with adhesive having first adhesive properties, a second region with adhesive having second adhesive properties, and a third region without adhesive. This segmentation allows precise control over where adhesive is present and its characteristics.
2Strength
If adhesive is applied to the entire cover tape surface, then the cover tape adheres strongly to the battery cell, but adhesive exposure reduces assemblability and productivity
Solution Approach 1:
The patent creates local quality variations in adhesive distribution across the cover tape width. The first and second regions provide adhesion where needed, while the third region without adhesive prevents exposure issues. This localized approach maintains necessary adhesion strength while eliminating productivity-reducing adhesive exposure.
Solution Approach 2:
The patent extracts adhesive from the third region of the cover tape, creating an adhesive-free zone. This removal of adhesive from specific areas prevents adhesive exposure problems that would otherwise reduce assemblability and productivity, while retaining adhesive in regions where it is functionally necessary.
3Strength
If adhesive is applied to the entire cover tape surface, then the cover tape adheres strongly to the battery cell, but adhesive exposure causes defects in external devices
Solution Approach 1:
The patent implements local quality control by applying adhesive only to the first and second regions while leaving the third region without adhesive. This prevents adhesive from reaching the outer surface of the battery cell and potentially causing defects in external devices, while maintaining adequate adhesion strength in the regions where adhesive is applied.
Solution Approach 2:
The patent extracts adhesive from the third region of the cover tape to create an adhesive-free zone. This extraction prevents adhesive exposure that could lead to defects in external devices, while preserving adhesive strength in the first and second regions where adhesion is required.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cover tape design effectively prevents adhesive exposure, maintaining assemblability and productivity while reducing the risk of adhesive contamination in external devices.
Implementation Method 1
a cover tape attached to the pouch so as to at least partially cover at least two surfaces of the pouch, wherein the cover tape includes a fixing area attached to a first surface of the pouch, a dot area attached to a second surface of the pouch, and adhesives on (e.g. provided on) the fixing area and the dot area
Data Source
Figure 1
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AI summary
A secondary battery includes an electrode assembly, a pouch accommodating the electrode assembly, and a cover tape attached to the pouch so as to at least partially cover at least two surfaces of the pouch. The cover tape includes a fixing area attached to a first surface of the pouch, a dot area attached to a second surface of the pouch, and adhesives on the fixing area and the dot area, and the adhesives have different adhesive forces.