All-solid-state battery insulating member with thickened inner edge
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Solution Overview
Problem
All-solid-state secondary batteries produced by existing methods often experience internal short circuits due to principal and shearing stresses caused by pressing, leading to collapse of the peripheral powder layers.
Innovation Solution
Incorporating a plate-shaped insulating member with a thicker inner edge portion than the outer portion, arranged between collectors and contacting the solid electrolyte layer, to absorb distortion and prevent shearing forces from causing collapse during pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a force is applied for pressing the laminate to form the all-solid-state secondary battery, then the constituent layers are compressed to achieve uniform thickness and high performance, but the peripheral portion of the powder layers collapses due to shearing stress, causing internal short circuit
Solution Approach 1:
A plate-shaped insulating member is introduced as an intermediary component between the positive and negative electrode layers. This insulating member has a thicker inner edge portion that contacts the laminate, providing mechanical support to prevent collapse of the peripheral powder layers during pressing, while the plate-shaped portion provides electrical insulation. This mediator resolves the contradiction by supporting the structure where needed without causing short circuits.
Solution Approach 2:
The insulating member is designed with non-uniform thickness, where the inner edge portion has a larger thickness than the plate-shaped portion on the outer side. This local quality variation provides targeted mechanical support at the critical inner edge region where shearing stress causes collapse, while maintaining electrical insulation throughout. The localized thickness enhancement prevents peripheral collapse without interfering with the overall pressing process.
2Ease of manufacture
If the insulating member has uniform thickness, then the structure is simple and easy to manufacture, but it cannot effectively prevent the collapse of the peripheral portion under shearing stress
Solution Approach 1:
The insulating member features variable thickness with a thicker inner edge portion and a thinner plate-shaped outer portion. This local quality differentiation provides enhanced mechanical strength and shear resistance at the critical inner edge region where it contacts the laminate, while maintaining manufacturing feasibility through a relatively simple single-piece structure.
Solution Approach 2:
The insulating member employs asymmetric thickness distribution, being thicker at the inner edge portion and thinner at the outer plate-shaped portion. This asymmetry is strategically designed to provide maximum structural support where shearing stress is most problematic, while reducing material usage and simplifying the overall structure compared to a uniformly thick design.
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 internal short circuits by distributing pressure evenly and maintaining the structural integrity of the laminate layers, ensuring stable charge-discharge performance.
Implementation Method 1
the insulating member being arranged around the laminate and contacted at least with the solid electrolyte layer to electrically insulate the positive electrode layer and the negative electrode layer from each other
Implementation Method 2
The middle portion of the powder layers is compressed by pressing, but the peripheral portion thereof forms an inclined surface and is thin. Therefore, due to the shearing force, the peripheral portion of the powder layers collapses
Implementation Method 3
a principal stress and a shearing stress. The principal stress is produced by the force applied for pressing and acts on the constituent layers
Data Source
AI summary
The present invention provides an all-solid-state secondary battery and a method for producing the same that can prevent the collapse of a laminate due to a shearing force occurring in the peripheral portion of the laminate when the laminate is pressed, and the occurrence of an internal short circuit can be prevented. The all-solid-state secondary battery includes a laminate and a plate-shaped insulating member both arranged between the positive electrode collector and the negative electrode collector. The laminate includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. The plate-shaped insulating member is arranged around the laminate and contacted at least with the solid electrolyte layer to electrically insulate the positive electrode layer from the negative electrode layer. In the insulating member, a contact inner edge portion contacted with the laminate is thicker than a plate-shaped portion on the outer side.