Secondary Battery Pouch Bridge Part Elongation Control
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Solution Overview
Problem
Pouch-type secondary batteries face issues with dimensional variability and poor appearance due to elongation of the bridge part when folded, leading to reduced processability and fixing force of the electrode assembly.
Innovation Solution
A pouch design with a shortened bridge part and a die configuration that includes inclined stepped surfaces to define the bridge part, ensuring a controlled depth and height, minimizing elongation and enhancing the fixing force of the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bridge part is made longer to connect two accommodation parts, then the pouch can accommodate thicker electrode assemblies, but the bridge part elongates when folded causing dimensional variability and poor appearance
Solution Approach 1:
The patent changes the geometric parameters of the bridge part by introducing a stepped configuration with multiple levels instead of a uniform structure. This stepped design allows the bridge to accommodate varying thicknesses of electrode assemblies while controlling the folded dimensions to maintain consistency and appearance quality.
2Ease of manufacture
If the bridge part is folded to connect accommodation parts, then the pouch structure is formed, but folding causes elongation leading to reduced fixing force of the electrode assembly
Solution Approach 1:
The bridge part is segmented into multiple stepped levels rather than being a single continuous fold. This segmentation allows each step to be formed with controlled geometry, reducing cumulative elongation effects and maintaining the fixing force of the electrode assembly while still enabling pouch formation through folding.
3Productivity
If the bridge part is folded, then the pouch is assembled, but folding causes dents and poor appearance
Solution Approach 1:
The stepped configuration of the bridge part is designed in advance to pre-determine the fold lines and angles. This preliminary design ensures that when folding occurs during assembly, the folds follow predetermined paths that minimize dent formation and maintain appearance quality, while still enabling efficient pouch assembly.
Data Source
AI summary
Provided are a pouch for a secondary battery, which is capable of minimizing a folded area of a bridge part of the pouch that is manufactured by folding two accommodation parts to overlap each other, and a die for forming the pouch for the secondary battery. The pouch for the secondary battery includes a lower accommodation part accommodating an electrode assembly therein, an upper accommodation part covering an opening of the lower accommodation part, and a bridge part connecting the lower accommodation part to the upper accommodation part. When the lower accommodation part and the upper accommodation part are unfolded, a height of the bridge part, which is measured from a bottom surface of the lower accommodation part, is lower than that of the lower accommodation part, which is measured from the bottom surface of the lower accommodation part.