Pouch Cell Jig Fixture for Crack-Free Isostatic Pressing
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Solution Overview
Problem
Conventional isostatic pressing methods for manufacturing all-solid-state batteries cause distortion and cracking in the electrodes and electrolyte layers of pouch-type cells.
Innovation Solution
A method and apparatus using a lower and upper jig with central openings to secure and isostatically press the pouch cell, ensuring the sealing part is compressed, preventing distortion and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional isostatic pressing method is used to bond electrode-solid electrolyte interface, then bonding quality is improved, but cell distortion and cracking occur
Solution Approach 1:
A pouch-shaped pressing fixture is introduced as an intermediary tool between the pressing mechanism and the battery cell. This fixture distributes the pressing force uniformly across the cell surface through its flexible pouch structure, preventing localized stress concentration that causes distortion and cracking while still achieving effective interface bonding
Solution Approach 2:
The pressing method transitions from direct mechanical contact pressing to fluid-mediated isostatic pressing. By changing the pressing parameter from localized mechanical force to uniform fluid pressure distributed through the pouch fixture, the process achieves both good bonding quality and maintains cell shape integrity
2Reliability
If isostatic pressing is performed to ensure electrode-solid electrolyte interface bonding, then ionic conductivity is improved, but cracks occur in electrode and electrolyte layers
Solution Approach 1:
The pouch-shaped pressing fixture acts as a mediator that transforms the pressing mechanism into a uniform distributed load. This intermediary structure ensures that the force required for good interface bonding and ionic conductivity is applied evenly, preventing stress concentration that would cause cracks in the electrode and electrolyte layers
Solution Approach 2:
The pressing process achieves homogeneous force distribution across the entire cell surface through the flexible pouch fixture. This homogeneity ensures uniform interface bonding throughout the cell while maintaining structural integrity, as no localized area experiences excessive stress that would cause cracking
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
Prevents cell distortion and cracking during isostatic pressing, maintaining the integrity of the electrode and electrolyte layers.
Implementation Method 1
isostatic pressing is performed without cell distortion, thereby preventing cracks from occurring in the electrodes and electrolyte layers
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A manufacturing method and apparatus for an all-solid-state battery are disclosed, which allow for isostatic pressing without causing cell distortion, thereby preventing cracks in the electrode and electrolyte layers. The manufacturing method for the aforementioned all-solid-state battery includes the steps of: (a) arranging a lower jig with an opening formed in its center portion; (b) accommodating the cup part of a pouch cell downward into the opening of the aforementioned lower jig, and placing the sealing part located on the outer periphery of the aforementioned cup part on the upper surface of the aforementioned lower jig, thereby fixing the aforementioned pouch cell; (c) fixing an upper jig with an opening formed in its center portion on top of the aforementioned lower jig so that the openings overlap and the sealing part of the pouch cell is compressed; and (d) isostatically pressing the aforementioned pouch cell while the pouch cell is seated in the upper jig and lower jig.