Pouch Battery Sealing Structure for Low-Profile Edgefolds
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Solution Overview
Problem
Lithium ion batteries face structural interference issues due to the high edgefold protrusion of packaging bags, which hinders integration with other components and reduces user assembly efficiency.
Innovation Solution
A notched structure is introduced at the intersection of the top seal and side seal in the packaging bag, with specific dimensions and folding configurations to reduce the height of the edgefold protrusion, minimizing interference and improving integration by folding the side seal over the packaging portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the packaging bag is sealed with side seals folded over to form edgefold protrusions, then sealing reliability is improved, but structural interference with other components increases and integration level decreases
Solution Approach 1:
The side seal is divided into multiple sections: a first side seal section that forms the edgefold protrusion for sealing, and a second side seal section that extends beyond the cell end to form a tail section. This segmentation allows the sealing function and the integration function to be separated spatially, resolving the contradiction between sealing reliability and structural integration.
Solution Approach 2:
The side seal is extended in the longitudinal dimension beyond the cell end, creating a tail section that protrudes from the packaging bag. This dimensional extension moves the potential interference issue from the lateral dimension (where edgefold protrusions interfere with components) to the longitudinal dimension, where the tail section can be integrated with other components without affecting sealing.
2Reliability
If the side seal is folded over and fixed to form edgefold protrusions, then sealing performance is improved, but interference with installed components increases
Solution Approach 1:
The side seal structure is segmented into a folded edgefold section for sealing and an extended tail section for component integration. This segmentation ensures that the sealing function is fulfilled by the edgefold protrusion while the tail section provides clearance and integration space, eliminating interference with installed components.
Solution Approach 2:
The tail section of the side seal acts as an intermediary element between the sealed cell and external components. It provides a transition zone that maintains sealing integrity while accommodating component installation, thus mediating between sealing performance requirements and component installation ease.
3Strength
If the edgefold protrusion has great height perpendicular to top seal, then sealing strength is improved, but structural compactness and integration are reduced
Solution Approach 1:
The side seal is segmented into a compact edgefold section that provides sealing strength and an extended tail section that manages volume. The edgefold protrusion maintains necessary height for sealing strength, while the tail section extends longitudinally to utilize space efficiently, maintaining overall structural compactness.
Solution Approach 2:
Instead of increasing edgefold protrusion height in the lateral dimension (which would reduce compactness), the solution extends the side seal in the longitudinal dimension. This dimensional change allows sealing strength to be maintained through adequate edgefold height while achieving compactness through longitudinal extension of the tail section.
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 notched structure effectively reduces the height of the edgefold protrusion, enhancing structural compactness and integration by minimizing interference with other components during use, while maintaining effective sealing and safety performance.
Implementation Method 1
The side seal is folded over along an edge of the side seal adjacent to the first packaging portion and fixed to an outer side surface of the first packaging portion
Implementation Method 2
A notched structure is formed at an intersection of the top seal and the side seal
Data Source
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AI summary
The present application discloses a battery to reduce a height of an edgefold protrusion in a direction perpendicular to a top seal, reduce structural interference between the edgefold protrusion and other components and parts, and improve a structural compactness when a user utilizes the battery. The battery includes: a cell, a packaging bag configured to package the cell, and an electrode tab connected with the cell. The packaging bag includes a first packaging portion configured to accommodate the cell and a second packaging portion formed by packaging the cell. The second packaging portion includes a top seal configured to seal the electrode tab and two side seals intersecting the top seal. A notched structure is formed at an intersection of the top seal and the side seal. The side seal is folded over along an edge of the side seal adjacent to the first packaging portion and fixed to an outer side surface of the first packaging portion.