Soft-Packaged Battery Seal Cavity Design for Strength
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Solution Overview
Problem
Soft-packaged lithium-ion batteries have low sealing strength and short service life, which limits their application in long-period energy storage and high-reliability fields due to inadequate sealing technology, particularly in energy storage systems where safety and reliability are critical.
Innovation Solution
The proposed solution involves a cell with a packaging pouch that includes a seal portion with a defined cavity within the sealed area, formed using heat sealing technology to improve bonding layer flow and reduce thermal and mechanical stress, enhancing sealing strength and reliability by at least 35% compared to existing technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional seal head sealing technology is used, then the sealing process is simple and easy to manufacture, but the sealing strength is low and service life is short (less than three years)
Solution Approach 1:
The patent changes the sealing method from conventional seal head sealing to heat sealing with controlled temperature, pressure, and time parameters. By optimizing these parameters, the bonding layer flows properly to form a cavity structure that significantly enhances sealing strength while maintaining manufacturing feasibility through standardized heat sealing processes
Solution Approach 2:
The patent employs a multi-layer aluminum-plastic composite film structure with specific material compositions. The composite material structure, combined with controlled heat sealing, creates a robust seal portion with enhanced strength and durability, resolving the contradiction between sealing strength and ease of manufacture
2Duration of action of stationary object
If conventional sealing technology is used, then the production process is simple, but the service life is short and cannot meet long-period energy storage requirements
Solution Approach 1:
The patent performs preliminary action by creating a cavity structure within the seal portion during the heat sealing process. This cavity formation, achieved through controlled bonding layer flow, preliminarily establishes the stress distribution pattern that prevents seal failure during long-term operation, thereby extending service life for energy storage applications
Solution Approach 2:
The cavity structure formed during heat sealing acts as a beforehand cushioning mechanism. It provides a buffer zone that absorbs and distributes thermal and mechanical stresses before they can propagate through the seal portion, preventing premature failure and extending the service life of the soft-packaged lithium-ion battery
3Reliability
If conventional seal head sealing is used, then the sealing process is straightforward, but thermal and mechanical stress affects seal reliability
Solution Approach 1:
The cavity structure within the seal portion acts as an intermediary that mediates between thermal and mechanical stresses and the seal integrity. By providing a stress-absorbing void space, the cavity prevents direct stress transmission that would otherwise compromise seal reliability, allowing the seal to withstand operational stresses without failure
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 increased sealing strength and reliability of the cell improve its safety and longevity, addressing the limitations of current sealing technologies by providing a more robust and durable seal that meets the requirements for long-period energy storage applications.
Implementation Method 1
formed using heat sealing technology to improve bonding layer flow and reduce thermal and mechanical stress
Data Source
AI summary
The present disclosure provides a cell and a battery. The cell includes a cell body and a packaging pouch configured to accommodate the cell body therein. The packaging pouch includes a seal portion, the seal portion includes a sealed area, and the sealed area defines a cavity therein. According to embodiments of the present disclosure, the seal strength of the seal portion of the cell may be increased significantly, and the reliability and safety of the cell may be improved.