Solid-State Battery Groove Layout for Stress-Resistant Electrolytes
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Solution Overview
Problem
Existing battery technologies face challenges in achieving high reliability due to the risk of short circuits and burnout from external stress, particularly in large area and thinned batteries.
Innovation Solution
The battery design incorporates an electrode layer, a counter electrode layer, and a solid electrolyte layer, where the electrode layer includes a current collector and an active material layer with a structural defect portion in a line shape in the second region, allowing the battery to selectively bend and absorb external stress without damaging the active material layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery is made with larger area and thinner structure to improve energy density, then productivity and energy density are improved, but the reliability deteriorates due to increased susceptibility to external stress and short circuits
Solution Approach 1:
The patent applies preliminary action by pre-forming groove-shaped structural defects in the solid electrolyte layer or current collector before the battery is put into service. These grooves are strategically positioned in the second region (outside the active material layer projection) to create predetermined stress absorption zones. When external stress is applied during battery operation, the stress concentrates in these pre-formed grooves, causing selective bending or damage in the second region while protecting the active material layer in the first region from stress-induced short circuits. This preliminary structural preparation enables the thin, high-energy-density battery design to maintain high reliability.
2Reliability
If structural defects are added to the battery structure to improve reliability, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by introducing structural defects (grooves) only in specific localized regions rather than throughout the entire battery structure. The grooves are positioned exclusively in the second region (the region outside the projection of the active material layer), creating localized stress absorption zones. This localized approach modifies only the necessary portions of the structure to achieve stress resistance, while leaving the rest of the battery structure simple and intact. The groove-shaped defects are confined to specific areas where they can effectively absorb stress without interfering with the active material layer or requiring complex overall structural redesign.
3Reliability
If the active material layer area is reduced relative to current collector and solid electrolyte layer to enable structural defect placement, then reliability is improved, but the energy density deteriorates
Solution Approach 1:
The patent applies dimensionality change by utilizing the planar dimension (top view area) to resolve the conflict between active material quantity and reliability. By positioning structural defects in the second region (outside the projection of the active material layer in the planar dimension), the invention creates a spatial separation between the active material layer and the stress-absorbing grooves. This dimensional arrangement allows the active material layer to maintain its full area for high energy density while the grooves occupy the surrounding peripheral region. The groove-shaped defects extend in the planar dimension rather than encroaching on the active material layer area, enabling both high active material quantity and effective stress protection through spatial differentiation in the two-dimensional plane.
Data Source
AI summary
A battery includes an electrode layer, a counter electrode layer facing the electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer. The electrode layer includes an electrode current collector and an electrode active material layer located between the electrode current collector and the solid electrolyte layer and having an area smaller than those of the electrode current collector and the solid electrolyte layer in plan view. In a first region including the electrode active material layer and a second region outside the first region in plan view, the solid electrolyte layer covers the outside of the electrode active material layer and is in contact with the electrode current collector in the second region, and the electrode current collector or the solid electrolyte layer includes at least one structural defect portion in a line shape in plan view in the second region.