Pouch Battery Case Anti-Wrinkle Bending for Smooth Stacking
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Solution Overview
Problem
Secondary batteries often develop wrinkles on their outer shells during manufacturing, particularly when vacuum is applied to discharge internal gas, leading to interference issues when stacked.
Innovation Solution
A method involving the formation of an anti-wrinkle bending part on the outer shell of the battery case, using a pressing block with bending formation parts to prevent wrinkles by thermally compressing the pouch sheet, and a manufacturing process that includes forming, folding, and sealing steps to create a pouch-type battery case with an anti-wrinkle feature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If vacuum is applied to discharge internal gas of the battery case, then gas discharge function is improved, but wrinkles are generated on the outer shell
Solution Approach 1:
An anti-wrinkle bending part is formed on the outer shell before gas discharge occurs. This preliminary structural modification creates a predetermined bending region that prevents wrinkle formation during subsequent vacuum gas discharge, allowing the harmful gas to be removed while maintaining surface smoothness.
Solution Approach 2:
The anti-wrinkle bending part introduces a localized structural feature at specific positions on the outer shell. This local modification changes the mechanical properties of the shell in critical areas, making those regions more resistant to wrinkle formation during gas discharge while leaving other areas unchanged.
2Volume of moving object
If pouch sheet is folded to form battery case, then compact structure is achieved, but wrinkles are generated on the outer shell
Solution Approach 1:
The anti-wrinkle bending part is formed on the pouch sheet before the folding process. This preliminary action prepares the material to accommodate folding stresses without developing wrinkles, enabling the pouch to be folded into a compact battery case while maintaining outer shell smoothness.
Solution Approach 2:
The anti-wrinkle bending part introduces controlled curvature or rounded features at critical locations on the pouch sheet. These curved transitions distribute stress more evenly during folding, preventing the sharp creases and wrinkles that would otherwise form at angular or straight-fold locations.
3Shape
If anti-wrinkle bending part is formed on outer shell, then wrinkle prevention is improved, but device complexity increases
Solution Approach 1:
The anti-wrinkle bending part is formed by modifying physical parameters of the pouch sheet such as local thickness, curvature, or material properties at specific positions. These parameter changes are achieved through simple processes like localized heating, pressing, or mechanical deformation, avoiding complex additional components or multi-step manufacturing procedures.
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 anti-wrinkle bending part effectively prevents the generation of bat-ear shape wrinkles on the outer shell and its vicinity, enhancing the stacking compatibility and reducing deformation during gas discharge.
Implementation Method 1
using a pressing block with bending formation parts to prevent wrinkles by thermally compressing the pouch sheet
Data Source
AI summary
The present invention relates to a secondary battery, a method for manufacturing the same, and a pressing block for manufacturing the secondary battery. The method for manufacturing the secondary battery according to the present invention comprises a forming step of forming a pouch sheet to form an accommodation part in which an electrode assembly is accommodated, a folding step of folding the pouch sheet with respect to a folding part to accommodate the electrode assembly in the accommodation part, and to block the accommodation part from outside to form a battery case, and an anti-wrinkle step of forming an anti-wrinkle bending part on an outer shell of the pouch sheet to prevent wrinkles from being generated on the outer shell of the folded pouch sheet.