Solid-State Battery Insulation Layout for Bent Tab Wire Clearance
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Solution Overview
Problem
Conventional all-solid-state batteries face challenges in ensuring adequate insulation when tab wires from negative electrode current collectors are gathered, leading to a short clearance between the tab wires and the positive electrode current collector due to bending.
Innovation Solution
The implementation of a configuration where a first insulating material is placed at the end of the positive electrode layer, and a second insulating material is positioned between the negative electrode current collector and the solid electrolyte layer, ensuring a creepage distance greater than the straight-line distance between the negative and positive electrode current collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tab wires are gathered to enable battery function, then productivity and compactness are improved, but the clearance between tab wires and positive electrode current collector decreases leading to insulation problems
Solution Approach 1:
An insulating layer is introduced as an intermediary component between the tab wires and the positive electrode current collector. This insulating layer acts as a mediator that maintains the necessary insulation distance even when tab wires are gathered, preventing electrical short circuits while allowing the battery to function properly.
Solution Approach 2:
The insulating structure extends in the stacking direction (thickness dimension) rather than relying solely on the lateral clearance. By adding insulation in the vertical dimension through the insulating layer, the patent compensates for the reduced lateral clearance caused by tab wire gathering, ensuring adequate insulation distance in three-dimensional space.
2Ease of operation
If tab wires are bent for gathering, then ease of operation and compactness are improved, but mechanical strength and insulation clearance are reduced
Solution Approach 1:
The insulating layer is positioned in advance at the location where tab wires will be gathered and bent. This pre-positioned insulating layer cushions and protects the bent tab wires from direct contact with the positive electrode current collector, maintaining both mechanical integrity and electrical insulation despite the bending operation.
3Reliability
If insulating distance is increased to prevent short circuits, then reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
The insulating layer is applied locally only at specific positions where tab wires are gathered and where insulation is critically needed, rather than covering the entire positive electrode current collector. This localized approach maintains the necessary insulation distance for reliability while minimizing the overall structural complexity and material usage.
Data Source
AI summary
An all-solid-state battery is provided that can ensure adequate insulation even in a situation in which tab wires extending from negative electrode current collectors are gathered in order for the function as a battery to be performed, and a clearance between the tab wires and a positive electrode current collector is short due to bend of the tab wires. The all-solid-state battery includes an electrode body including a positive electrode current collector, a positive electrode layer, a solid electrolyte layer, a negative electrode layer, and a negative electrode current collector that are stacked in this order. The battery further includes a first insulating material at an end of the positive electrode layer, and a second insulating material at a portion that is between the negative electrode current collector and the solid electrolyte layer and faces an end of the solid electrolyte layer and an end of the first insulating material.