Battery Cell Surface Recesses for Reliable Sealing
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Solution Overview
Problem
Conventional lithium battery packaging methods using flat sealing heads suffer from low reliability, leading to corrosion, liquid leakage, and potential battery failure due to inadequate sealing and uneven polymer layer fusion, which compromises safety and efficiency.
Innovation Solution
The introduction of a cell and package device design featuring a first end surface with alternating flat and recess portions, allowing for air bubble discharge and overflow glue accommodation, thereby enhancing polymer layer fusion and package tension, ensuring reliable bonding of the aluminum plastic film and improved safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flat sealing heads are used for packaging, then the packaging process is simple, but the package reliability is low and corrosion/damage occurs
Solution Approach 1:
The sealing head surface is designed with different local structures: flat portions for stable bonding and recess portions for air bubble discharge and glue overflow accommodation. This local differentiation improves package reliability without requiring complete structural redesign of the entire sealing head.
Solution Approach 2:
The sealing head surface is segmented into multiple flat portions and recess portions rather than being a single continuous surface. This segmentation allows different functional zones to coexist, enabling reliable packaging while maintaining structural simplicity.
2Manufacturing precision
If flat sealing surfaces are used, then the bonding process is straightforward, but air bubbles are trapped and polymer layer fusion is uneven
Solution Approach 1:
The sealing head incorporates recess portions at specific locations to facilitate air bubble discharge during bonding. This local structural modification ensures uniform polymer layer fusion by preventing air entrapment, while the overall sealing surface remains relatively simple.
Solution Approach 2:
The recess portions are designed to extract and discharge air bubbles from the bonding interface during the packaging process. By providing dedicated escape paths for air bubbles, the polymer layer fusion becomes more uniform without complicating the overall sealing process.
3Reliability
If conventional packaging methods are used, then the process is fast, but glue overflows and encroaches on unpackaged regions
Solution Approach 1:
The recess portions are strategically positioned to extract and contain excess glue during the packaging process. By providing dedicated overflow zones, the design prevents glue from encroaching on unpackaged regions, improving sealing quality without requiring slower packaging speeds.
Solution Approach 2:
The sealing head surface has localized recess portions that specifically address glue overflow at critical areas. This local structural addition maintains the overall fast packaging process while improving sealing quality by containing glue within designated zones.
4Strength
If flat sealing heads are used, then the structure is simple, but package tension is insufficient and bonding is unreliable
Solution Approach 1:
The sealing head design incorporates flat portions that provide stable bonding surfaces to enhance package tension. These flat portions are strategically positioned to ensure reliable bonding at critical areas, improving overall package strength without requiring complete redesign of the sealing head structure.
Data Source
AI summary
The application provides a cell and a package device. The cell comprises a first end surface including a flat portion and a recess portion, and the flat portion and the recess portion are spaced apart from each other. The purpose of the present application is to provide a cell and a package device, which can overcome the disadvantages on the surface of the planar sealing head of the conventional package device, and improve the package efficiency and reliability of the battery.