Pouch Lithium Battery Wing Portion Integration
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Solution Overview
Problem
The conventional method of fabricating pouch type lithium secondary batteries is time-consuming and costly due to the need for a separate battery package case, limiting manufacturing yield and cost reduction.
Innovation Solution
A pouch type lithium secondary battery design that integrates a wing portion of the pouch exterior to directly wind around the electrode assembly storing portion, eliminating the need for a separate package case, and a method of fabricating this design involving hot-melting thermoplastic adhesive materials for molding units and electrolyte injection with gas collection, allowing for a simplified packaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate battery package case is used in conventional fabrication method, then the battery structure is protected and complete, but the fabrication process becomes time-consuming and costly
Solution Approach 1:
The pouch exterior is designed to integrate both the battery packaging function and the protective case function into a single unified structure. The wing portion of the pouch exterior wraps around and merges with the battery element, eliminating the need for a separate package case while maintaining structural protection and reliability.
2Strength
If a separate battery package case is used, then structural integrity is maintained, but manufacturing cost increases
Solution Approach 1:
The pouch exterior structure is engineered to combine the packaging pouch and protective case into one integrated component. This merging reduces the total number of parts and assembly steps, lowering manufacturing costs while the wing portion design ensures structural integrity is maintained through the integrated construction.
3Reliability
If a separate battery package case is used, then the battery is fully protected, but the fabrication process becomes complex
Solution Approach 1:
The invention merges the packaging pouch and protective case into a single integrated pouch exterior structure. This consolidation simplifies the fabrication process by reducing the number of separate components that need to be manufactured and assembled, while the wing portion design ensures comprehensive protection is maintained.
4Reliability
If conventional packaging method is used, then the battery structure is complete, but manufacturing yield is limited
Solution Approach 1:
The pouch exterior is designed as an integrated structure combining the pouch and case functions. This merging simplifies the fabrication process into fewer steps with fewer potential failure points, thereby improving manufacturing yield while maintaining complete battery structure through the unified design.
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
This approach simplifies the packaging process, reduces manufacturing time, and lowers costs by eliminating the need for a separate package case, while maintaining the structural integrity and functionality of the battery.
Implementation Method 1
The first and second molding units may be formed by hot-melting the pouch exterior
Implementation Method 2
The thermoplastic adhesive may include a material selected from a group consisting of an ethylene-vinyl acetate (EVA) copolymer based material, a polyamide based material, a polyester based material, a rubber based material, and a polyurethane based material
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A pouch type lithium secondary battery (100) includes an electrode assembly (200) including a first electrode plate (210) connected to a first electrode tap (215), a second electrode plate (220) connected to a second electrode tap (225), and a separator (230) interposed between the first and second electrode plates. The battery also includes a pouch exterior (300) having an electrode assembly storing portion (300A) and at least a wing portion (300B) extending from at least an end of the electrode assembly storing portion. The wing portion entirely winding around side faces of the electrode assembly storing portion. A method of fabricating a pouch type lithium secondary battery is also disclosed.