Battery Pouch Sealing Blocks With Differential Heating
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Solution Overview
Problem
The non-uniform sealing quality of secondary battery pouches due to heat loss at the electrode lead region during the sealing process, leading to inconsistent temperature distribution and compromised sealing integrity.
Innovation Solution
A sealing apparatus with paired sealing blocks that apply differential heating and pressure to the lead sealing and case sealing regions, ensuring uniform temperature distribution by heating the lead sealing regions at a higher temperature than the case sealing regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing device includes a sealing member and a case with a sealing groove, then sealing performance is improved, but manufacturing complexity increases due to additional components and assembly steps
Solution Approach 1:
The sealing member is integrated directly into the case structure, with the sealing groove formed as part of the case body rather than as a separate component. This merging of the case and sealing member into a single integrated structure maintains effective sealing while reducing the number of discrete parts and simplifying assembly operations.
Solution Approach 2:
The case structure serves multiple functions simultaneously: it provides structural containment for the battery components and incorporates the sealing groove to perform the sealing function. This multi-functionality eliminates the need for a dedicated separate sealing component, reducing overall device complexity while maintaining sealing reliability.
2Reliability
If the sealing member has a head portion and a leg portion with specific geometric features, then sealing effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sealing member features localized geometric variations including a head portion with increased width and a leg portion with specific thickness ratios. These local quality variations concentrate sealing pressure at critical interfaces while maintaining overall structural simplicity, achieving effective sealing without requiring high precision across the entire component.
Solution Approach 2:
The sealing member is formed from a resin material that provides both structural integrity and sealing properties. The material composition is designed to accommodate the geometric features (head and leg portions) while maintaining manufacturability through injection molding or similar processes, balancing sealing effectiveness with manufacturing feasibility.
Data Source
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AI summary
A sealing apparatus for a secondary battery according to the present invention is a sealing apparatus for sealing a battery case, which accommodates an electrode assembly therein, to manufacture the secondary battery. The secondary battery comprises an electrode lead which is connected to the electrode assembly and extended to the outside of the battery case, and the battery case comprises: a lead sealing portion in which the electrode lead is located in a pressing direction at an outer circumferential surface; and a case sealing portion in which only the battery case is located. The sealing apparatus comprises: a pair of sealing blocks which press the outer circumferential surface of the battery case; and a heating unit which is provided in the pair of sealing blocks and heat the pair of sealing blocks. The pair of sealing blocks comprise: lead sealing regions configured to press the lead sealing portion of the battery case; and case sealing regions configured to press the case sealing portion of the battery case. The heating unit heats the lead sealing regions and the case sealing regions of the pair of sealing blocks at different temperatures.