Battery Packaging Bag Corners Reinforced by Overlapping Adhesive Lugs
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Solution Overview
Problem
The corners of packaging bags in built-in batteries, typically made of plastic sealing films, are prone to damage during use due to stress concentration and deformation, leading to potential failure.
Innovation Solution
A secondary battery design featuring a packaging bag with integrally connected films and an easy-peel adhesive tape with overlapping lugs that distribute stress evenly, protecting the corners and reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the packaging bag is made of plastic sealing film, then the battery can be sealed and protected, but the corners of the packaging bag are prone to damage due to stress concentration
Solution Approach 1:
The adhesive tape is applied in advance to the packaging bag, particularly at the corners, to provide protective reinforcement before the battery undergoes assembly or experiences stress. This pre-positioned adhesive tape acts as a cushioning element that prevents corner damage from occurring during subsequent handling or operation.
Solution Approach 2:
The solution combines the plastic sealing film packaging bag with an adhesive tape material to create a composite structure. The adhesive tape, potentially made of different material properties than the plastic film, reinforces the corner regions and distributes stress more evenly, preventing the stress concentration that would otherwise occur at the sharp corners of the plastic packaging bag.
2Stability of the object's composition
If the adhesive tape is applied to secure the packaging bag, then the battery can be fixed in position, but the corners remain vulnerable to breakage
Solution Approach 1:
The adhesive tape is applied selectively at specific locations on the packaging bag, particularly emphasizing corner regions and areas prone to stress concentration. This localized application provides enhanced protection where it is most needed while maintaining the overall stability and positioning function of the adhesive tape across the battery structure.
3Strength
If the packaging bag corners are reinforced to prevent damage, then corner strength improves, but the device complexity increases
Solution Approach 1:
The adhesive tape serves as an intermediary element between the packaging bag and the external environment or structural components. By positioning the adhesive tape at corner regions, it mediates the stress distribution and protects the packaging bag corners from direct damage, thereby enhancing corner strength without requiring fundamental changes to the packaging bag design or structure.
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 overlapping lugs in the adhesive tape effectively distribute stress, minimizing corner breakage and enhancing the structural integrity of the battery packaging, thereby improving durability and energy density.
Implementation Method 1
The easy-peel adhesive tape includes a substrate layer and an adhesion layer disposed on a surface of the substrate layer
Data Source
AI summary
A secondary battery includes an electrode assembly, a packaging bag, a tab, and an easy-peel adhesive tape. A main body portion of the packaging bag includes a first surface, a second surface, a first side surface, a second side surface, and a third side surface. The tab protrudes from the first side surface. The easy-peel adhesive tape includes a first surface region, a second surface region, a first side surface region that is adhered to the first surface, to the second surface, and to the third side surface respectively. A first lug of the easy-peel adhesive tape is adhered to the second side surface, and a second lug of the easy-peel adhesive tape is adhered to the second side surface. The second lug and the first lug have a first overlapping portion.