Pouch Battery Venting Frame for Predictable Gas Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch-type lithium secondary batteries experience unpredictable ventilation due to internal gas generation, leading to potential damage and instability without effective venting mechanisms.
Innovation Solution
A ventilation device with frames and connectors, featuring ventilation guiding portions and terrace restraining portions, controls gas direction and suppresses pouch expansion, preventing damage and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lamination film is welded at a sealing portion to induce directional venting, then gas venting direction is controlled, but sufficient venting inducing effects and battery cell stability are not provided
Solution Approach 1:
The ventilation guiding portion is divided into multiple functional segments: an inclined surface for initial gas direction, a terrace restraining portion for stabilizing the pouch, and a ventilation control portion for regulated gas release. This segmentation allows each component to perform its specific function effectively, providing both directional control and sufficient venting induction while maintaining battery cell stability
Solution Approach 2:
The ventilation guiding portion extends in multiple spatial dimensions with the inclined surface creating a sloped path, the terrace portion adding a stepped dimension, and the ventilation control portion providing a controlled exit. This multi-dimensional structure enhances gas direction control and venting effectiveness compared to a simple planar sealing film
2Stress or pressure
If the internal pressure increases beyond a tolerable critical value, then gas ventilation occurs to relieve pressure, but the ventilation location cannot be easily predicted and may cause damage or explosion
Solution Approach 1:
The ventilation guiding portion is pre-formed with a specific structure including an inclined surface, terrace restraining portion, and ventilation control portion at a predetermined location on the pouch. This preliminary structural preparation ensures that when internal pressure exceeds the critical value, gas ventilation occurs at this pre-designed location rather than randomly, making the ventilation location predictable and preventing uncontrolled damage or explosion
Solution Approach 2:
The ventilation guiding portion is designed with specific geometric parameters: an inclined surface at a predetermined angle, a terrace restraining portion at a specific height, and a ventilation control portion with defined dimensions. These parameter specifications ensure that the pouch expands and vents in a controlled manner at the designed location when internal pressure increases, providing predictable pressure relief
3Reliability
If a ventilation guiding portion is recessed from the facing surface, then gas direction is controlled and pouch expansion is suppressed, but the device structure becomes more complex
Solution Approach 1:
The ventilation guiding portion serves multiple functions simultaneously: the inclined surface directs gas flow, the terrace restraining portion suppresses pouch expansion, and the ventilation control portion regulates gas release. By integrating these multiple functions into a single recessed structure, the design achieves effective pouch expansion control without proportionally increasing device complexity
Solution Approach 2:
The inclined surface, terrace restraining portion, and ventilation control portion are merged into a single integrated ventilation guiding portion that is recessed from the facing surface. This merging of multiple functional elements into one unified structure provides effective gas direction and pouch expansion control while minimizing the increase in overall device complexity
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 device delays and directs gas venting, predicting ventilation locations, preventing battery cell damage, and maintaining stability even under increased internal pressure.
Implementation Method 1
A terrace restraining portion having an inclined surface is formed at a surface of the frame adjacent to a surface including the ventilation guiding portion
Implementation Method 2
A ventilation control portion is formed as a space between the first frame and the second frame to be connected to the ventilation guiding portion
Data Source
AI summary
A ventilation device for a secondary battery includes a frame including a first frame and a second frame, and a connector connecting the first frame and the second frame to each other and including a slit portion. Each of the first frame and the second frame includes a facing surface that faces each other, and at least one of the first frame and the second frame includes a ventilation guiding portion recessed from the facing surface. The frame includes a terrace expansion restraining portion including an inclined surface structured to support a pouch terrace portion of the secondary battery and formed at a surface of the frame adjacent to a surface including the ventilation guiding portion. A ventilation control portion is formed to provide a space between the first frame and the second frame to be connected to the ventilation guiding portion.