Pouch Lead Sealing Block With Edge Protrusions Against Film Flow
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Solution Overview
Problem
During the sealing process of pouch-type secondary batteries, the lead film covering the lead metal can flow into the inner-outer direction of the pouch, leading to reduced durability and quality of the battery.
Innovation Solution
A sealing device with a sealing block that includes sealing surfaces and protrusions to press and heat-seal the lead film and pouch, preventing the lead film from flowing into the inner-outer direction of the pouch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat and pressure are applied to seal the lead film and pouch, then the sealing quality is improved, but the lead film flows into the inner-outer direction of the pouch
Solution Approach 1:
The sealing block incorporates protrusions at specific locations (edge portions of the sealing surface) that create localized structural features. These protrusions have different geometries than the flat central sealing area, providing localized constraint against lead film flow while maintaining effective sealing pressure in the central region. This local quality modification resolves the contradiction by preventing film flow without compromising sealing quality.
Solution Approach 2:
The protrusions on the sealing block create preliminary resistance to the lead film's natural flow direction during sealing. By positioning these protrusions at the edge portions of the sealing surface, the design anticipates and counteracts the inward flow tendency of the heated lead film before it can penetrate into the pouch interior, thus preventing the harmful effect while maintaining sealing effectiveness.
2Manufacturing precision
If the sealing pressure is increased to prevent lead film flow, then the lead film position is controlled, but the pouch material may be damaged
Solution Approach 1:
The sealing block design distributes pressure differently across the sealing surface through the presence of protrusions. The protrusions concentrate pressure at specific edge locations to prevent film flow, while the flat central sealing area maintains adequate but not excessive pressure for proper sealing. This localized pressure distribution prevents pouch damage while controlling lead film position.
Solution Approach 2:
The sealing surface is segmented into different functional zones: protrusions at the edge portions for preventing film flow, and a flat central sealing area for primary sealing. This segmentation allows independent optimization of each zone's function, enabling precise control of lead film position without applying excessive pressure that would damage the pouch throughout the entire sealing area.
3Reliability
If the sealing block surface is made flat to ensure uniform sealing, then the sealing consistency is improved, but the lead film flows into the pouch
Solution Approach 1:
The sealing block combines a predominantly flat sealing surface for consistent sealing with localized protrusions at specific edge portions. The flat central area ensures uniform contact and consistent sealing across the main sealing zone, while the protrusions provide localized geometric features that prevent lead film flow into the pouch. This local quality modification resolves the contradiction between sealing consistency and film position control.
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 sealing device effectively suppresses or prevents the lead film from flowing, thereby improving the durability and quality of pouch-type secondary batteries.
Implementation Method 1
a pouch, which is a packaging material, and an electrode lead are heat-sealed by a heating block or heating jig, which is a medium that provides heat and pressure
Implementation Method 2
a sealing block including at least one sealing surface provided to press the lead film and the pouch overlapping with each other
Data Source
AI summary
A sealing device according to an embodiment of the present disclosure seals a lead film covering a lead metal of an electrode lead and a pouch enclosing the lead film. The sealing device includes a sealing block including at least one sealing surface provided to press the lead film and the pouch overlapping with each other; and a sealing protrusion provided on a portion of the sealing surface to protrude from the sealing surface with a predetermined thickness in a pressing direction of the sealing block to prevent the lead film from flowing into a width direction of the sealing surface.