Pouch Battery Sealing Block for Wrinkle-Free Rounded Corners
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Solution Overview
Problem
Existing sealing technologies for pouch-shaped battery cases fail to prevent wrinkles and cracks at the rounded corners of the electrode assembly reception unit, leading to defects during manufacturing processes.
Innovation Solution
A sealing block with a main body unit and a wrinkle prevention unit featuring a curved structure and extension portion is used to seal the battery case, ensuring the sealed portion extends to the rounded corners, minimizing deformation and preventing wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional sealing block is used to seal the battery case, then the sealing process is simple and fast, but wrinkles and cracks are generated at the rounded corners of the electrode assembly reception unit during vacuum decompression
Solution Approach 1:
The sealing block is divided into two functional units: a main body unit for sealing the outer edge and a wrinkle prevention unit with a curved structure for preventing wrinkles at the rounded corners. This segmentation allows each unit to perform its specific function effectively, maintaining sealing speed while preventing defects.
Solution Approach 2:
The wrinkle prevention unit is specifically designed with a curved structure that corresponds to the rounded corner of the electrode assembly reception unit. This local adaptation of the sealing block's geometry to match the specific shape requirement at the corner area prevents stress concentration and wrinkle formation during vacuum decompression.
2Ease of operation
If the battery case is subjected to repetitive vacuum decompression and expansion, then gas discharge and electrolyte introduction are achieved, but stress concentration at the corners causes wrinkles and tears
Solution Approach 1:
The wrinkle prevention unit with the curved structure is positioned at the rounded corners before the vacuum decompression process begins. This preliminary structural preparation prevents stress concentration and wrinkle formation during subsequent repetitive vacuum decompression and expansion cycles, maintaining structural integrity while enabling gas discharge functionality.
3Device complexity
If the sealed portion does not extend to the rounded corners, then the sealing process is simpler, but the corners become distorted and warped under stress
Solution Approach 1:
The wrinkle prevention unit incorporates a curved structure that corresponds to the rounded corner of the electrode assembly reception unit. This curved design matches the natural geometry of the corner, allowing the sealed portion to extend smoothly to the rounded corners without creating stress concentration points, thereby maintaining corner shape stability under stress.
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 solution effectively reduces the defect rate of pouch-shaped battery cases by preventing wrinkles and cracks, maintaining structural integrity during repetitive vacuum decompression and expansion processes.
Implementation Method 1
a main body unit for sealing at least a part of an outer edge of a battery case from which an electrode terminal protrudes by applying heat and/or pressure thereto
Data Source
AI summary
A sealing block for sealing a pouch-shaped secondary battery includes a main body unit for sealing at least a part of an outer edge of a battery case from which an electrode terminal protrudes by applying heat and/or pressure thereto and a wrinkle prevention unit coupled perpendicularly to one surface of the main body unit, the wrinkle prevention unit including a curved structure that corresponds to a rounded corner of an electrode assembly reception unit of the battery case, wherein the wrinkle prevention unit further includes an extension portion for connecting the curved structure of the wrinkle prevention unit to the main body unit. Sealing may be performed when the wrinkle prevention unit is adjacent to the electrode assembly reception unit via the extension portion.