All-Solid-State Battery With Jig-Free Low-Resistance Interfaces
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Solution Overview
Problem
Conventional all-solid batteries require heavy pressure-restraining jigs to maintain low solid-solid interface resistance, which is impractical and limits battery design flexibility.
Innovation Solution
An all-solid battery is produced using a dry process to form a solid electrolyte layer with inorganic solid electrolytes, allowing plastically deformable particles to be densely packed under atmospheric pressure, eliminating the need for restraining jigs and reducing interface resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure restraining jig is used to maintain low solid-solid interface resistance, then interface resistance is reduced, but device complexity and weight increase
Solution Approach 1:
The patent removes the pressure restraining jig from the battery structure entirely. By designing the battery to maintain low interface resistance through material selection and structural design rather than external mechanical constraint, the complex restraining device is extracted from the system, simplifying the overall battery structure while maintaining reliability.
Solution Approach 2:
The battery structure is designed to self-maintain low interface resistance through its own structural features and material properties. The solid electrolyte layer and electrode configurations are optimized to naturally ensure good contact and low resistance without requiring external pressure application devices.
2Reliability
If pressure restraining jig is used to maintain low solid-solid interface resistance, then interface resistance is reduced, but weight increases
Solution Approach 1:
The heavy pressure restraining jig is completely removed from the battery system. The invention achieves low interface resistance through material and structural design rather than mechanical compression, eliminating the weight penalty associated with pressure application devices.
Solution Approach 2:
The battery structure is designed to self-maintain optimal contact conditions through its own structural features and material properties, eliminating the need for external weight-bearing pressure devices and thereby reducing overall battery weight.
3Ease of manufacture
If conventional battery structure is used, then manufacturing is simpler, but volume occupancy is reduced due to restraining jig
Solution Approach 1:
The volume-consuming pressure restraining jig is removed from the battery design. This extraction of the mechanical constraint device increases the available volume for active materials and improves overall volume occupancy while maintaining manufacturing simplicity through optimized material and structural 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
The battery achieves low interface resistance and high energy density without the use of restraining jigs, enabling efficient battery reactions and increased volume occupancy.
Implementation Method 1
when pressurizing the electrode group or the battery, the particles of the solid electrolyte are plastically deformed so as to be densely filled in the solid electrolyte layer
Implementation Method 2
an ion-conductive solid electrolyte layer interposed between the positive electrode and the negative electrode
Data Source
Figure 1
AI summary
An all-solid battery includes at least a unit cell including a positive electrode, a negative electrode, and an ion-conductive solid electrolyte layer interposed between the positive electrode and the negative electrode. The solid electrolyte layer includes an inorganic solid electrolyte, and a resistance R1 of the unit cell when the pressure applied in a thickness direction of the unit cell is 100 kPa is 90 Ωcm2 or less.