Solid State Battery Sleeve Insulator Short Circuit Prevention
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Solution Overview
Problem
Conventional solid state batteries face issues such as short circuits between electrode layers and external terminals, and delamination of electrode layers during manufacturing and charging/discharging due to the structure of the insulating parts in the lamination process, particularly when using printing methods.
Innovation Solution
A solid state battery design featuring a sleeve-shaped insulating part that covers the active material of the electrode layers in the boundary region with external terminals, preventing electrical short circuits and delamination by ensuring the insulating part is in contact with the principal surface of the electrode layers and securely positioned outside the lamination direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulating part structure is used in the lamination process, then the manufacturing process is simple, but short circuits between electrode layers and external terminals occur
Solution Approach 1:
The insulating part is extended from a two-dimensional planar structure to a three-dimensional structure by forming protrusions that extend in the lamination direction. This dimensional change allows the insulating part to physically bridge and isolate electrode layers at different positions, preventing short circuits while maintaining manufacturing feasibility through conventional printing methods.
Solution Approach 2:
The insulating part is divided into multiple segments including a base portion and multiple protrusions. Each protrusion independently provides insulation at specific critical points where short circuits are most likely to occur. This segmentation allows targeted insulation reinforcement without requiring a complete restructuring of the entire insulating part.
2Reliability
If the insulating part is extended to prevent short circuits, then electrical insulation is improved, but delamination of electrode layers occurs
Solution Approach 1:
The insulating part exhibits local quality variations with different regions serving distinct functions: the base portion provides general insulation and adhesion to the substrate, while the protrusions provide localized insulation at critical short-circuit risk areas. This differentiated local quality allows effective short-circuit prevention without excessive material presence that would cause delamination.
Solution Approach 2:
The insulating part features asymmetric geometry with protrusions of varying heights and positions tailored to the specific layout of electrode layers and external terminals. This asymmetric design provides insulation precisely where needed while minimizing interference with electrode layer stacking and adhesion, thereby preventing both short circuits and delamination.
3Reliability
If a sleeve-shaped insulating part is used to cover active material, then short circuits are prevented, but manufacturing precision requirements increase
Solution Approach 1:
The insulating part is formed in advance during the green sheet lamination stage, before firing and electrode layer formation. The protrusions are pre-positioned to match the planned electrode layer and external terminal locations. This preliminary action allows the insulating part to be precisely positioned relative to future electrode structures without requiring high-precision post-processing alignment.
Solution Approach 2:
The insulating part's geometric parameters, particularly the height and position of protrusions, are optimized to provide adequate insulation clearance between electrode layers and external terminals. By adjusting these parameters within acceptable ranges, the design achieves reliable electrical insulation while accommodating normal variations in manufacturing precision during the lamination and firing processes.
Data Source
AI summary
A solid state battery that includes: a solid state battery laminate that includes at least one battery constituent unit including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a positive electrode terminal on a first side surface of the solid state battery laminate; a negative electrode terminal on a second side surface opposite the first side surface of the solid state battery laminate; and an insulating part having a sleeve shape in a sectional view of the solid state battery, the insulating part covering an active material part of at least one electrode layer of the positive electrode layer and the negative electrode layer in a boundary region with the external terminal.