Pouch Battery Corner Fixing to Suppress High-Pressure Venting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch-type secondary batteries face issues with internal pressure increase due to gas generation during charging and discharging, leading to potential exfoliation, deformation, internal short circuits, and explosion, especially when stored at high temperatures.
Innovation Solution
Incorporation of an anti-venting tool coupled to the corner portions of the pouch case, which suppresses venting by allowing the corner portion to protrude through the tool, thereby enhancing operational stability and preventing energy density reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pouch case is sealed to accommodate the electrode assembly, then the battery structure is compact and sealed, but gas generated during charging/discharging causes internal pressure increase leading to exfoliation, deformation, and potential explosion
Solution Approach 1:
The anti-venting tool is coupled to the corner portions of the peripheral portion before gas generation and pressure increase occur. This preliminary positioning allows the tool to be ready to suppress venting when gas is generated during charging/discharging cycles, preventing exfoliation and deformation before they can occur.
Solution Approach 2:
The anti-venting tool provides a counteracting force against the internal pressure increase caused by gas generation. By being pre-positioned at the corner portions, it creates resistance against the harmful pressure buildup, preventing the pouch case from exfoliating or deforming under stress.
2Reliability
If corner portions are reinforced to prevent venting, then operational stability improves, but device complexity increases due to additional anti-venting tools
Solution Approach 1:
Instead of reinforcing the entire pouch case uniformly, the anti-venting tools are applied locally only at the corner portions of the peripheral portion. This localized reinforcement provides venting suppression exactly where it is most needed while minimizing the addition of structural complexity to the overall battery design.
Solution Approach 2:
The venting suppression function is segmented into discrete anti-venting tools that are coupled to individual corner portions. This segmentation allows each corner to be independently reinforced without requiring complex integrated structures, simplifying the overall design while maintaining reliability.
3Duration of action of stationary object
If anti-venting tools are added to suppress venting, then lifespan and operational stability improve, but manufacturing complexity increases
Solution Approach 1:
The anti-venting tools are coupled to the corner portions during the manufacturing process before the battery is sealed and filled with electrolyte. This preliminary coupling allows the tools to be installed as part of the assembly process, and once in place, they require no further adjustment or maintenance throughout the battery's operational lifespan.
Data Source
AI summary
A secondary battery includes an electrode assembly including a cathode and an anode, a pouch case including an accommodating portion in which the electrode assembly is placed and a peripheral portion extending along a circumference of the accommodating portion and sealing the electrode assembly, and an anti-venting tool coupled to at least one corner portion among corner portions of the peripheral portion to fix the corner portion. The corner portion is inserted through the anti-venting tool to protrude from the anti-venting tool.