Battery Pouch Molding with Local Pressure Blocks for Wrinkle Relief
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Solution Overview
Problem
During the molding process of secondary battery pouches, uneven suction of the pouch base material leads to pouch wrinkles, which existing methods attempt to address by increasing overall pressure, risking equipment and mold damage.
Innovation Solution
An apparatus for manufacturing secondary battery pouches, featuring a lower die, punch, stripper, and back plate with protruding blocks, allows for localized high pressure application to relieve pouch wrinkles without increasing overall pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If overall pressure for gripping the pouch base material is increased to prevent wrinkles, then pouch molding quality improves, but equipment and mold damage risk increases
Solution Approach 1:
The invention applies local quality by providing protruding blocks at specific locations on the back plate where wrinkles commonly occur. These protruding blocks concentrate the gripping pressure locally on the pouch base material at problematic areas, rather than uniformly increasing overall pressure. This localized pressure application eliminates wrinkles at critical positions while maintaining safe overall pressure levels, thus improving pouch molding quality without increasing equipment and mold damage risk.
2Reliability
If uniform pressure is applied to grip the pouch base material, then equipment safety is maintained, but pouch wrinkles occur due to non-uniform suction
Solution Approach 1:
The protruding blocks create non-uniform local pressure distribution on the pouch base material. By strategically positioning these blocks at areas prone to wrinkling, the system applies higher gripping force exactly where needed to prevent wrinkles, while the overall pressure remains within safe limits for equipment operation. This resolves the contradiction between equipment safety and molding quality.
Solution Approach 2:
The protruding blocks are pre-positioned on the back plate at locations where wrinkles are likely to form during the molding process. This preliminary arrangement ensures that when the molding operation begins, the correct areas of the pouch base material are immediately subjected to enhanced gripping pressure, preventing wrinkles before they can form during the suction process.
Data Source
AI summary
An apparatus for manufacturing a pouch of a secondary battery according to the present invention includes a lower die having an accommodation groove for molding a cup part of the pouch on a base surface, on which the pouch is disposed, a punch inserted into the accommodation groove of the lower die to mode the cup part of the pouch, a stripper disposed above the lower die to face the lower die and provided to press a peripheral portion of the pouch, which is disposed around a portion to be molded into the cup part of the pouch by the punch, from an upper side, and a back plate coupled to the stripper and configured to support the stripper, wherein a protruding block protruding toward the stripper is provided on a surface (S) of surfaces of the back plate, which faces the stripper.