Pouch Battery Sealing Block for Wrinkle-Free Corner Sealing
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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 during manufacturing, leading to defects and reduced battery capacity.
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
1Reliability
If a conventional sealing block with a protrusion unit is used to seal the battery case, then the sealing function is achieved, but wrinkles and cracks are generated at the rounded corners of the electrode assembly reception unit due to stress concentration during vacuum decompression
Solution Approach 1:
The sealing block applies different structural characteristics to different regions: the main body unit provides general sealing pressure, while the wrinkle prevention unit with extension portion provides localized reinforcement specifically at the rounded corners where stress concentration occurs during vacuum decompression. This local quality enhancement prevents wrinkles and cracks without affecting the overall sealing function.
Solution Approach 2:
The wrinkle prevention unit with extension portion is designed in advance to extend toward the rounded corners of the electrode assembly reception unit. This preliminary structural arrangement ensures that when vacuum decompression occurs, the corners are already protected by the extended structure, preventing stress concentration before wrinkles can form.
2Manufacturing precision
If the sealing block seals the outer edges of the battery case, then the battery case is sealed properly, but the rounded corners of the electrode assembly reception unit experience stress concentration and deformation during vacuum decompression
Solution Approach 1:
The sealing block differentiates between general sealing requirements and corner protection requirements. The wrinkle prevention unit with extension portion provides localized structural support specifically at the rounded corners, maintaining their shape and stability during vacuum decompression while the main body unit performs the general sealing function.
Solution Approach 2:
The extension portion of the wrinkle prevention unit is pre-positioned to reach toward the rounded corners before sealing. This preliminary action ensures that when vacuum decompression occurs, the corners are already supported and constrained, preventing deformation and maintaining structural stability throughout the process.
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 vacuum decompression and compression processes.
Implementation Method 1
a sealing block for sealing a pouch-shaped secondary battery, the sealing block including a main body unit for sealing an outer edge of a battery case from which an electrode terminal protrudes and an outer edge of the battery case parallel thereto by applying heat and/or pressure thereto
Data Source
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AI summary
Disclosed herein is a sealing block for sealing a pouch-shaped secondary battery, the sealing block including a main body unit for sealing an outer edge of a battery case from which an electrode terminal protrudes and an outer edge of the battery case parallel thereto 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, 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 in the state in which the wrinkle prevention unit is located so as to be adjacent to the electrode assembly reception unit via the extension portion. As a result, the outer edge of the battery case that is adjacent to the corner of the electrode assembly reception unit is fused such that a sealed portion is formed thereat. Consequently, the sealed portion of the battery case is fixed, whereby the battery case is prevented from being deformed and wrinkles are prevented from being formed in the battery case.