Pouch Battery Degassing with Vacuum-Fixed Corners
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Solution Overview
Problem
The degassing process of pouch type secondary batteries often results in deformation of the pouch, leading to wrinkles and cracks at the corners, which can cause electrolyte leakage and moisture intrusion, thereby deteriorating battery quality.
Innovation Solution
A degassing device is designed with a pressing part to face the accommodation part of the battery and press it in the direction of the electrode assembly, and a fixing part that surrounds the edge of the accommodation part and applies negative pressure to the corner to adsorb and fix it, preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the accommodation part is pressed to move gas during the degassing process, then gas discharge is achieved, but the corner of the pouch deforms and wrinkles form
Solution Approach 1:
The pressing device is divided into multiple pressing members that can independently apply pressure to different regions of the pouch. This segmentation allows gas to be discharged from the accommodation part while corners are simultaneously protected by dedicated fixing members, resolving the contradiction between gas discharge efficiency and corner integrity
Solution Approach 2:
Different regions of the pouch receive different treatments during degassing: the accommodation part is pressed to discharge gas while the corners are fixed with negative pressure. This local differentiation of pressing and fixing actions allows simultaneous achievement of gas discharge and corner protection
2Productivity
If the pouch is pressed during degassing, then gas is discharged from the accommodation part, but stress concentrates at the corner causing cracks
Solution Approach 1:
The fixing members apply negative pressure (suction force) to the corners as a counteracting force to the positive pressure applied to the accommodation part. This counterbalance prevents stress concentration at corners while maintaining degassing efficiency
Solution Approach 2:
The fixing members are positioned and activated before pressing begins to pre-secure the corners in place. This preliminary fixing prevents the corners from deforming or cracking when pressing force is subsequently applied to discharge gas
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 degassing device effectively prevents the formation of wrinkles and cracks at the corners of the battery pouch during the degassing process, thereby minimizing damage and maintaining battery quality.
Implementation Method 1
a fixing part that is provided to surround an edge of the accommodation part and applies negative pressure to a corner of the accommodation part to adsorb and fix the corner
Data Source
AI summary
The present invention relates to a degassing device, and more particularly, to a degassing device used in a degassing process of a pouch type secondary battery.The degassing device includes a pressing part, which is provided to face one surface of an accommodation part of pouch type secondary battery and press the accommodation part in a direction of an electrode assembly, and a fixing part which is provided to surround an edge of the accommodation part to apply a negative pressure to a corner of the accommodation part to adsorb and fix the corner.