Laminated Battery Electrode Edge Insulation for Higher Volume Efficiency
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Solution Overview
Problem
Conventional all-solid-state battery configurations have low volume energy efficiency due to the presence of an insulating member outside the power generation elements, leading to intrusion of insulating sealing material between layers and potential layer breakage under restraint load.
Innovation Solution
A laminated battery design with an insulating layer positioned at the edge of the second electrode layer, closer to the center than the first electrode layer, and with a thickness equal to or less than the second electrode layer, preventing insulating material intrusion and applying restraint load only to the power generation elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating sealing portion is provided at the periphery of power generation elements including areas outside the positive and negative electrode collectors, then insulating properties are improved, but volume energy efficiency deteriorates
Solution Approach 1:
The insulating layer is selectively positioned only at the edge of the second electrode layer rather than covering the entire periphery of power generation elements. This localized approach provides insulating protection exactly where needed (at the electrode edge) while avoiding unnecessary insulation in other areas, thus improving volume energy efficiency while maintaining sufficient insulating properties.
2Reliability
If insulating sealing material is applied onto the periphery of counter electrode plates, then insulating properties are improved, but intrusion of insulating material between layers occurs causing lower battery performance
Solution Approach 1:
The insulating layer is formed on the solid electrolyte layer before the second electrode layer is stacked. This preliminary positioning ensures that the insulating layer is already in its final location, preventing insulating material from intruding between layers during the stacking process and eliminating the need for subsequent sealing operations that could cause intrusion.
3Reliability
If insulating sealing material is applied onto the periphery of counter electrode plates, then insulating properties are improved, but layer breakage occurs due to restraint load
Solution Approach 1:
The insulating layer is extracted from the power generation elements (specifically, it is not disposed over the positive and negative electrode collectors) and positioned only at the edge of the second electrode layer. This separation removes the source of restraint load from the active components, preventing layer breakage while maintaining insulating properties at the necessary location.
4Reliability
If the insulating layer is positioned closer to the center than the first electrode layer edge, then insulating properties are improved, but volume energy efficiency is reduced
Solution Approach 1:
The insulating layer is positioned precisely at the edge of the second electrode layer, which is closer to the center than the first electrode layer edge. This specific localization provides insulating protection at the critical interface where the second electrode layer meets the solid electrolyte layer, preventing short-circuits while minimizing the space occupied by the insulating material to preserve volume energy efficiency.
Data Source
AI summary
Provided is a laminated battery that exhibits high volume energy efficiency and allows preventing intrusion of an insulating material between layers during production of the battery. A laminated battery disclosed herein includes a first collector layer, a first electrode layer, a solid electrolyte layer, a second electrode layer and a second collector layer. The first electrode layer opposes the second electrode layer across the solid electrolyte layer. An insulating layer is provided at an edge of the second electrode layer, in at least one edge of the laminated battery. In a direction perpendicular to a stacking direction of the laminated battery, the edge of the second electrode layer is positioned closer to a center of the laminated battery than an edge of the first electrode layer, and an outer edge of the insulating layer lies at the same position as that of the edge of the first electrode layer, or is positioned closer to the center of the laminated battery than that of the edge of the first electrode layer. The thickness of the insulating layer is equal to or smaller than the thickness of the second electrode layer.