All-solid-state battery insulation frame prevents dislocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing production method for all-solid-state battery stacks is prone to dislocation and short-circuiting due to deformation during the pressing process, especially when an insulator is used, leading to potential damage to the solid electrolyte layer and increased risk of dislocation during layering of structural unit cells.
Innovation Solution
Incorporating an insulation frame surrounding the outer periphery of the first active material layer, bonded to the current collector layers, which aligns with the inner periphery of the second active material layer, thereby stabilizing the structure and preventing bending and dislocation during stacking, and using a positioning jig to align the insulation frames for precise stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulator is added to prevent short-circuiting, then electrical insulation is improved, but device complexity and risk of dislocation increase
Solution Approach 1:
The patent merges the insulator with the current collector by forming an insulating film on the current collector surface. This integration reduces the number of separate parts while maintaining electrical insulation functionality, thereby resolving the contradiction between improved insulation and reduced device complexity.
2Stress or pressure
If pressure is applied during pressing to ensure contact, then contact pressure is improved, but deformation and dislocation occur
Solution Approach 1:
The insulating film is formed on the current collector before the pressing step. This preliminary action prevents deformation and dislocation during pressing by providing a protective layer that maintains structural integrity under pressure, thereby resolving the contradiction between ensuring contact pressure and preventing dislocation.
3Ease of manufacture
If the insulator and negative electrode active material layer are not bonded prior to pressing, then ease of assembly is improved, but dislocation risk during fabrication increases
Solution Approach 1:
The insulator is merged with the current collector through film formation, creating a pre-integrated structure. This eliminates the need for separate bonding steps while preventing dislocation during fabrication, thereby resolving the contradiction between ease of manufacture and manufacturing precision.
4Device complexity
If no insulator is present to allow edge contact, then device simplicity is improved, but solid electrolyte layer damage occurs
Solution Approach 1:
The insulating film is applied locally on the current collector surface, providing protection specifically at critical areas where edge contact occurs. This localized quality approach prevents solid electrolyte layer damage while maintaining overall structural simplicity, thereby resolving the contradiction between device complexity and harmful factors.
Data Source
AI summary
The present disclosure provides a structural unit cell, and an all-solid-state battery stack in which the structural unit cells are layered, whereby it is possible to inhibit dislocation during stacking and short circuiting. The structural unit cell comprises a first current collector layer, a first active material layer, a solid electrolyte layer, a second active material layer and a second current collector layer stacked in that order, and having an insulation frame which is disposed surrounding the outer periphery of the first active material layer, and is bonded to the first current collector layer and/or second current collector layer, wherein, as seen from the stacking direction, the first active material layer is disposed on the inner side of the outer periphery of the second active material layer, and the insulation frame has its inner periphery on the inner side of the outer periphery of the second active material layer.