Solid-State Battery Electrode Edge Inactivation Against Short Circuits
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Solution Overview
Problem
All-solid-state batteries face issues with internal short circuits due to non-uniform lithium precipitation and damage to the edges of positive electrode plates during manufacturing, especially under high pressure conditions.
Innovation Solution
The battery incorporates a positive electrode plate with an activation area and an inactivation area laser-processed on the outer boundary edge. The inactivation area blocks lithium ion entry and exit, preventing short circuits. The positive electrode plate is formed by laser-cutting the current collector coated with active material, minimizing edge damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If physical blades are used to punch electrode plates into unit shapes, then manufacturing process is simple, but edge damage and burrs cause short circuits
Solution Approach 1:
The patent replaces the mechanical punching system with a laser processing system. Instead of using physical blades to cut the electrode plates, a laser is used to process the edges, eliminating burrs and damage while maintaining manufacturing efficiency. This substitution of mechanical cutting with laser processing resolves the contradiction between ease of manufacture and edge integrity.
2Stability of the object's composition
If pressure is applied to prevent lithium precipitation non-uniformity, then lithium distribution improves, but edge areas become abnormally activated causing short circuits
Solution Approach 1:
The patent applies local quality by creating an inactivation area specifically at the edge portions of the electrode plates through laser processing. This local treatment modifies the edge areas to have different properties from the center areas, preventing abnormal activation at edges while maintaining uniform lithium distribution in the active regions. The inactivation area is selectively created only where needed to prevent short circuits.
Solution Approach 2:
The patent applies preliminary anti-action by pre-processing the edge areas with laser before the electrode plates are assembled into the battery. This preliminary treatment creates an inactivation area that prevents future abnormal activation and short circuits, countering the potential harmful effect of pressure-induced activation before it can occur during battery operation.
3Productivity
If continuous coating of active material is used, then production efficiency increases, but edge damage during punching increases short circuit risk
Solution Approach 1:
The patent replaces the mechanical punching process with laser processing to cut the continuously coated electrode plates. This substitution eliminates the edge damage and burrs caused by mechanical blades while maintaining the high production efficiency enabled by continuous coating. The laser processing can be performed on continuously produced electrodes without interrupting the manufacturing flow.
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
This configuration effectively prevents short circuits caused by edge damage and high pressure, ensuring stable operation of the all-solid-state battery by controlling lithium ion movement and reducing the risk of solid electrolyte layer breakdown.
Implementation Method 1
an inactivation area laser-processed on an outer boundary edge of the activation area
Data Source
AI summary
An all-solid-state battery according to an embodiment may include a positive electrode plate provided with an active material on a positive electrode current collector, a solid electrolyte layer disposed on one side of the positive electrode plate, and a negative electrode plate disposed on one side of the solid electrolyte layer, where the positive electrode plate may include an activation area of the active material, and an inactivation area laser-processed on an outer boundary edge of the activation area.