Solid Electrolyte Layer Prevents Current Collector Deformation
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Solution Overview
Problem
In secondary batteries, the regions without electrode parts on current collectors can deform towards each other due to external forces or thermal expansion, leading to potential contact and damage during charging and discharging.
Innovation Solution
Incorporating a solid electrolyte layer between successive electrode assemblies in a bipolar battery, where the layer is positioned perpendicular to the stacking direction, covering the regions without electrode parts and separating the current collectors, thereby preventing deformation and contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If electrode assemblies with minute cells are used to relieve stress, then stress relief is improved, but exposed portions of current collectors deform toward each other under external force or thermal expansion
Solution Approach 1:
A solid electrolyte layer is introduced as an intermediary substance between successive electrode assemblies. This layer fills the exposed portions of current collectors and prevents them from deforming toward each other, while maintaining ionic conductivity for battery operation. The solid electrolyte acts as a mediator that simultaneously addresses both stress relief and deformation prevention requirements.
Solution Approach 2:
The patent changes the physical state of the electrolyte from liquid to solid form. This parameter change allows the electrolyte to maintain structural support and prevent deformation of current collectors while still providing the necessary ionic conductivity for electrode function. The solid state provides mechanical stability without sacrificing electrochemical performance.
2Shape
If solid electrolyte layer is added between electrode assemblies, then deformation prevention is improved, but device complexity increases
Solution Approach 1:
The solid electrolyte layer serves multiple functions simultaneously: it provides ionic conductivity for battery operation, prevents deformation of current collectors, and maintains structural integrity of the electrode assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving deformation prevention.
Solution Approach 2:
The protective function against deformation is merged with the electrolyte function. Instead of adding a separate protective layer or support structure, the electrolyte itself is designed to perform both electrochemical and mechanical protective roles, simplifying the overall device structure while achieving the desired deformation prevention.
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 solid electrolyte layer effectively prevents deformation of current collectors and maintains the integrity of electrode parts, enhancing thermal dissipation and reducing temperature variations within the battery, thus improving the battery's structural stability and efficiency.
Implementation Method 1
A part of the solid electrolyte layer is located between successive electrode parts in a direction perpendicular to the stacking direction on at least one of successive electrode assemblies in the stacking direction
Implementation Method 2
enhancing thermal dissipation and reducing temperature variations within the battery
Data Source
AI summary
An electrical storage device has a solid electrolyte layer; and electrode assemblies stacked with the solid electrolyte layer interposed therebetween and each having a current collector on which a plurality of electrode parts are formed. A part of the solid electrolyte layer is located between successive electrode parts in a direction perpendicular to the stacking direction on at least one of successive electrode assemblies in the stacking direction.