Reinforced Solid Electrolyte Sheet for Damage-Resistant Battery Assembly
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Solution Overview
Problem
Solid electrolyte secondary batteries face issues with low rigidity, leading to potential damage and short circuits between the positive and negative electrode layers, limiting the size of the ion conduction region.
Innovation Solution
A solid electrolyte sheet with a periphery reinforcement area formed in a frame shape around the central active area, using a composite material of insulating members to enhance rigidity and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rigidity of the solid electrolyte sheet is increased to prevent damage and short circuits, then safety and structural integrity are improved, but the device complexity increases due to the need for composite materials and periphery reinforcement structures
Solution Approach 1:
The solid electrolyte sheet is divided into a central area (for ion conduction) and a periphery reinforcement area (for structural support). This segmentation allows each region to be optimized for its specific function: the central area maintains flexibility for lithium-ion conductivity while the periphery area provides rigidity to prevent damage and short circuits during assembly and operation
Solution Approach 2:
Different regions of the solid electrolyte sheet are given different material properties. The periphery reinforcement area uses a composite material with higher rigidity compared to the central area. This local differentiation of material quality ensures that reinforcement is applied only where structurally necessary, preventing damage at the periphery without compromising the ion conduction properties of the central region
2Strength
If the rigidity of the solid electrolyte sheet is increased to prevent damage, then structural integrity is improved, but the manufacturing precision requirements increase due to the need for precise formation of reinforcement areas
Solution Approach 1:
The periphery reinforcement area is formed in advance during the solid electrolyte sheet manufacturing process, before the sheet is assembled into the battery. This preliminary formation of the reinforcement structure ensures that the rigidity enhancement is built-in from the start, preventing damage during subsequent assembly operations without requiring high-precision adjustments during manufacturing
3Area of stationary object
If the size of the solid electrolyte sheet is increased to secure a large ion conduction region, then energy density is improved, but the risk of damage increases due to lower overall rigidity
Solution Approach 1:
The solid electrolyte sheet is divided into a central area (for ion conduction) and a periphery reinforcement area (for structural support). This segmentation allows each region to be optimized for its specific function: the central area maintains flexibility for lithium-ion conductivity while the periphery area provides rigidity to prevent damage and short circuits during assembly and operation
Solution Approach 2:
Different regions of the solid electrolyte sheet are given different material properties. The periphery reinforcement area uses a composite material with higher rigidity compared to the central area. This local differentiation of material quality ensures that reinforcement is applied only where structurally necessary, preventing damage at the periphery without compromising the ion conduction properties of the central region
Data Source
Figure 1~2
Figure 3(A)~3(D)
Figure 4~6
AI summary
A solid electrolyte sheet capable of increasing rigidity near an end surface of the solid electrolyte sheet, and a solid electrolyte secondary battery used with the solid electrolyte sheet are provided. A solid electrolyte sheet 10 includes a base 11 formed in a plate shape containing a solid electrolyte, and a plate-shaped reinforcing part 12 formed on an outside of the base, in which the reinforcing part 12 is made of a combination of two electrical insulating members different in material, and higher in rigidity than the base 11. Since rigidity near the periphery of the solid electrolyte sheet can be increased, a risk of damage near the periphery of the solid electrolyte sheet can be reduced.