Battery Pouch Molding Structure for Wrinkle-Free Cup Forming
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Solution Overview
Problem
Pouch wrinkles occur during the molding of secondary battery pouches due to uneven suction of the pouch base material caused by unbalanced or asymmetrical dies and strippers.
Innovation Solution
An apparatus with a lower die and stripper that includes anti-pushing grooves and protrusions to grip and mold the pouch base material uniformly, preventing uneven suction and wrinkles by limiting the movement of the pouch base material during molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a die and stripper are used for molding the pouch, then the pouch can be formed into the desired shape, but the pouch base material is non-uniformly suctioned causing wrinkles due to unbalanced or asymmetrical die and stripper
Solution Approach 1:
The patent applies asymmetry by designing the stripper with an asymmetric structure that corresponds to the asymmetric die. The stripper includes a first stripper portion and a second stripper portion with different configurations to match the asymmetric mold, ensuring uniform suction force distribution across the pouch base material during molding, thereby preventing wrinkles while maintaining the desired pouch shape
2Manufacturing precision
If the die and stripper are made symmetrical, then uniform suction can be achieved, but the pouch cannot be molded into the required asymmetric V-shape configuration
Solution Approach 1:
The patent employs asymmetric design for both the die and stripper components. The die includes asymmetric mold cavities for forming cup parts at different positions, and the stripper is configured with corresponding asymmetric portions that provide uniform suction force distribution. This asymmetric configuration enables the pouch to be molded into the required V-shape while maintaining suction uniformity and preventing wrinkles
3Ease of manufacture
If the pouch base material is freely suctioned into the mold, then the molding process is simple, but non-uniform suction causes wrinkles on the pouch surface
Solution Approach 1:
The patent applies preliminary action by pre-configuring the asymmetric stripper with suction elements positioned to compensate for anticipated non-uniform suction. The stripper is designed beforehand to provide balanced suction force distribution across the pouch base material, preventing wrinkles before they occur during the molding process, thus maintaining both process simplicity and surface quality
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 apparatus effectively relieves or removes pouch wrinkles by ensuring uniform suction and molding of the pouch base material, resulting in a more consistent and high-quality pouch manufacturing process.
Implementation Method 1
the pouch base material is non-uniformly suctioned into the pouch because the lower die and a stripper are unbalanced or asymmetrical with each other during the molding of the pouch
Data Source
AI summary
An apparatus for manufacturing a pouch of a secondary battery includes: a lower die having an accommodation groove for molding a cup part of the pouch formed in a base surface, on which the pouch is disposed; a punch inserted into the accommodation groove to mold the cup part; and a stripper provided to press a peripheral portion of the pouch, wherein the stripper and the lower die press and grip upper and lower portions of a peripheral portion of the pouch, respectively, in the state in which the peripheral portion of the pouch is gripped by the stripper and the lower die, the punch is inserted into the accommodation groove to mold the cup part of the pouch, and an anti-pushing groove is formed in any one of the lower die or the stripper, which presses the peripheral portion of the pouch.