Heated Press-Roller Pouch Sealing for Electrolyte Leak Prevention
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Solution Overview
Problem
Existing pouch sealing technologies face challenges in effectively removing electrolytic solution from the sealed portion of pouch-shaped secondary batteries, leading to reduced sealing quality and difficulty in maintaining the shape of the pouch during the sealing process.
Innovation Solution
A pouch sealing apparatus with a press roller system comprising upper and lower press rollers, which are heated to 250°C, moves electrolytic solution into the pouch receiving portion while fusing the pouch layers, ensuring accurate sealing by adjusting the distance between the rollers and using rail units to stabilize the pouch shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional flat sealing surface is used, then the sealing mechanism is simple, but it cannot accommodate pouches with varying seal depths without complex adjustment mechanisms
Solution Approach 1:
The sealing surface is divided into multiple independently adjustable sealing segments or zones, each capable of moving vertically to accommodate different seal depths. This segmentation allows each portion of the sealing surface to be independently positioned, providing adaptability for pouches with varying seal requirements without requiring complex overall mechanism adjustments.
Solution Approach 2:
The sealing surface transitions from a static flat structure to a dynamic adjustable structure where sealing elements can move vertically. This dynamic capability allows the sealing surface to adapt its configuration in real-time based on the specific pouch being sealed, enabling accommodation of varying seal depths while maintaining operational simplicity through automated or semi-automated adjustment mechanisms.
2Productivity
If pouches are conveyed one at a time, then sealing precision is maintained, but productivity is reduced compared to batch conveying
Solution Approach 1:
The sealing process is segmented into multiple independent sealing zones along the conveyance path, allowing different pouches in a batch to be sealed at different positions simultaneously. Each zone can independently control seal depth and timing, maintaining precision even when processing multiple pouches concurrently, thereby increasing throughput without sacrificing seal quality.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor pouch position, seal depth, and sealing force for each pouch in the batch. This feedback allows real-time adjustments to be made during the sealing process, ensuring that even when conveying multiple pouches simultaneously, each pouch receives the precise sealing parameters it requires, maintaining manufacturing precision while improving productivity.
3Reliability
If excess pouch is trimmed after sealing, then seal integrity is ensured, but material waste and additional processing time occur
Solution Approach 1:
The system performs preliminary measurement and positioning of the pouch seal depth before the actual sealing process. By pre-determining the exact seal depth required for each pouch based on its specific dimensions and requirements, the system can seal precisely at the correct location without needing to trim excess material afterward, thereby ensuring seal integrity while eliminating material waste and additional processing steps.
Solution Approach 2:
The mechanical trimming process is replaced with a precision positioning and sealing system that uses controlled dispensing of sealing force and heat to exactly where needed. This substitution of precise controlled energy application for mechanical trimming eliminates the need to remove excess material, maintaining seal integrity through precise energy delivery rather than through mechanical removal of material.
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 prevents electrolytic solution leakage and enhances sealing efficiency by removing residual solution from the sealed portion, maintaining pouch shape integrity, and ensuring uniform sealing quality.
Implementation Method 1
a heating element positioned below the pouch which engages with a seal area of the pouch
Implementation Method 2
a cooling element positioned above the pouch which engages with the seal area of the pouch
Data Source
Figure 1
Figure 2
Figure 3(a1)~3(a4)
AI summary
The preset invention relates to a pouch sealing apparatus capable of preventing leakage of an electrolytic solution, thereby improving a sealing effect, and more particularly to a pouch sealing apparatus configured to seal a pouch for batteries, the pouch including an upper pouch and a lower pouch, the pouch being configured to receive an electrode assembly and an electrolytic solution, the pouch sealing apparatus including a mounting unit configured to seat a pouch receiving portion thereon, a press roller configured to move the electrolytic solution into the pouch receiving portion while the press roller rolls from open ends of the upper pouch and the lower pouch toward the pouch receiving portion, and a sealing tool configured to seal parts of the upper pouch and the lower pouch to be sealed, wherein the press roller is configured to fuse the upper pouch and the lower pouch in contact with each other while being heated by a heating portion added to a part of the roller and rolling.