Mold Structure for Secondary Battery Pouch Wrinkle Prevention
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Solution Overview
Problem
Conventional mold structures for forming secondary battery pouches often result in wrinkled edges due to the bending of aluminum sheets, compromising the quality of the pouches.
Innovation Solution
A mold structure comprising an upper mold with a convex portion, a lower mold with a forming recess and an auxiliary mold part, and vacuum generators connected through air passages to create a vacuum low pressure, preventing wrinkles by supporting the aluminum sheet and maintaining uniform edge formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the aluminum sheet is bent using conventional molds, then the pouch can be formed, but the bent portions become wrinkled deteriorating quality
Solution Approach 1:
A back plate is introduced as an intermediary component between the lower mold and the aluminum sheet. The back plate supports the aluminum sheet from below during the bending process, preventing the sheet from wrinkling while being formed by the upper and lower molds. This mediator component directly addresses the wrinkling issue without compromising the pouch formation capability.
Solution Approach 2:
Vacuum generators are connected to air passages that extend through the auxiliary mold part to the forming recess. By creating negative pressure (vacuum) through these passages, the aluminum sheet is held firmly against the back plate during bending, preventing wrinkles. The pneumatic system provides uniform pressure distribution across the sheet surface, ensuring high manufacturing precision.
2Ease of manufacture
If the aluminum sheet is bent in the forming space of the lower mold, then the pouch is formed, but the bent edges become wrinkled
Solution Approach 1:
The back plate is positioned specifically at the bent edge regions where wrinkling occurs, providing localized support exactly where needed. The air passages are also strategically arranged to provide vacuum support at critical edge areas. This localized application of support and pressure ensures that problem areas (bent edges) receive enhanced attention without affecting the overall manufacturing 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 prevents wrinkling of the pouch edges, enhancing the quality and consistency of the formed pouches by maintaining a vacuum low pressure during the bending process.
Implementation Method 1
vacuum generator connected with air passages formed from two opposite sides of the auxiliary mold part to a bottom surface of the forming recess. The vacuum generators supplies or sucks air through the air passages
Implementation Method 2
The vacuum generators supplies or sucks air through the air passages... if the forming pressure is released as the lower mold descends, the back plate is elevated
Implementation Method 3
a plurality of elastic springs each of which has an upper end elastically installed in the plate portion and a lower end elastically installed in the auxiliary mold part
Implementation Method 4
an upper mold having a convex portion in a lower surface thereof to press-form a thin aluminum sheet
Data Source
AI summary
According to an embodiment, a mold structure comprises an upper mold having a convex portion in a lower surface thereof to press-form a thin aluminum sheet, a lower mold including a main mold part having a forming recess for forming the thin aluminum sheet placed thereon and an auxiliary mold part supporting the main mold part, a back plate spaced apart from an inside of the forming recess and supporting a lower surface of the aluminum sheet, and vacuum generator connected with air passages formed from two opposite sides of the auxiliary mold part to a bottom surface of the forming recess.