Pouch Battery Cover Tape With Zoned Adhesion to Prevent Exposure
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Solution Overview
Problem
Existing secondary batteries face issues with adhesive exposure on the outer surface of the cover tape, which can lead to reduced assemblability, productivity, and potential defects in external devices due to foreign substance attachment.
Innovation Solution
A cover tape design with varying adhesive forces is employed, featuring a base area with a first adhesive force, dot areas with lower adhesive forces, and fixing areas with higher adhesive forces, along with non-adhesive finishing areas to prevent adhesive exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied uniformly across the cover tape to ensure strong bonding, then bonding strength is improved, but adhesive exposure occurs on the outer surface leading to defects
Solution Approach 1:
The patent applies adhesive only to specific regions (fixing area and dot area) of the cover tape rather than uniformly across the entire surface. The fixing area provides strong bonding with higher adhesive force, while the dot area provides weaker adhesive force that prevents adhesive exposure. This localized adhesive application resolves the contradiction by ensuring strong bonding where needed while preventing harmful adhesive exposure in other areas.
2Reliability
If adhesive with high adhesive force is used to ensure reliable attachment, then attachment reliability is improved, but adhesive exposure and foreign substance attachment increase
Solution Approach 1:
The patent creates different adhesive force characteristics in different areas of the cover tape. The fixing area has high adhesive force for reliable attachment, while the dot area has low adhesive force that prevents adhesive from exposing to the outer surface where it could attract foreign substances. This spatial differentiation of adhesive properties resolves the contradiction between reliable attachment and preventing foreign substance attachment.
3Area of stationary object
If adhesive is applied to cover the entire cover tape surface, then coverage is improved, but assemblability and productivity are reduced due to adhesive exposure
Solution Approach 1:
The patent applies adhesive selectively to specific areas (fixing area and dot area) rather than the entire cover tape surface. The fixing area provides necessary coverage for reliable attachment, while the dot area provides minimal coverage that prevents adhesive exposure. This selective adhesive application maintains sufficient coverage for functionality while eliminating adhesive exposure that would harm assemblability and productivity.
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 design effectively prevents adhesive exposure, enhancing assemblability and productivity while minimizing the risk of adhesive-related defects in external devices.
Implementation Method 1
a cover tape (200) coupled to an outer surface of the battery cell (100), wherein the cover tape (200) includes a fixing area (240) attached to a first surface of the pouch (130), a dot area (220, 270) attached to a second surface of the pouch (130), and adhesives on the fixing area (240) and the dot area (220, 270), and the adhesives have different adhesive forces
Data Source
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.