Solid-State Battery Electrode Guide Structure for Stack Alignment
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Solution Overview
Problem
During the manufacturing process of solid-state batteries, electrodes tend to extend and displace, leading to potential short circuits, cracking, and stack displacement due to vibration or collisions, especially when using electrode laminates with current collectors in contact.
Innovation Solution
The solution involves a solid-state battery configuration with an electrode laminate structure that includes a first and second electrode mixture layer, a solid electrolyte layer, and fixing/guide members. The guide members are bonded to the electrolyte and fixing members to prevent electrode extension and displacement, with nonwoven fabrics and binders used to enhance stability, and elastic members to absorb expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are laminated via solid electrolyte layers during manufacturing, then the battery structure is formed, but electrode extension and displacement occur leading to short circuits and cracking
Solution Approach 1:
The patent applies preliminary action by providing guide members before electrode lamination to pre-establish positional constraints. The guide members are disposed on the solid electrolyte layer beforehand, creating a framework that guides and restricts electrode placement, thereby preventing extension and displacement during the manufacturing process
Solution Approach 2:
The guide members act as intermediaries between the solid electrolyte layer and the electrodes. These guide members mediate the interaction by providing a physical interface that transfers and distributes pressing forces uniformly, preventing direct contact-induced displacement between electrodes and electrolyte while maintaining structural integrity
2Device complexity
If current collectors are in contact in electrode laminate stacks, then assembly is simplified, but stack displacement occurs due to vibration and collisions
Solution Approach 1:
The guide members serve as intermediary elements between adjacent electrode laminates in the stack. By positioning guide members on the solid electrolyte layer, they create a buffered interface that prevents direct contact between current collectors, thereby eliminating vibration-induced displacement while maintaining simplified assembly through the self-aligning guide member structure
Solution Approach 2:
The guide members function as thin film structures that provide flexible yet stable positioning. These thin film guide members conform to the solid electrolyte layer surface while maintaining sufficient rigidity to prevent stack displacement, offering a balance between structural support and adaptability to manufacturing variations
3Manufacturing precision
If guide members are added to prevent electrode displacement, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The guide members exhibit multi-functionality by simultaneously serving as positioning guides, pressing force distributors, and protective barriers. This single component performs multiple critical functions that would otherwise require separate elements, thereby improving electrode alignment accuracy without proportionally increasing device complexity
Solution Approach 2:
The guide members are configured with uniform material properties and consistent geometric features across the battery structure. This homogeneity allows identical guide member designs to be used throughout the stack, simplifying manufacturing and assembly while maintaining consistent positioning precision across all electrode interfaces
Data Source
AI summary
Provided is a solid-state battery including: an electrode laminate in which a first electrode mixture layer, a solid electrolyte layer, a second electrode mixture layer, and a second fixing member are sequentially laminated over a first fixing member; a first guide member disposed along an outer periphery of the first electrode mixture layer; and a second guide member disposed along an outer periphery of the second electrode mixture layer. The first guide member is bonded to the solid electrolyte layer and/or the first fixing member, and the second guide member is bonded to the solid electrolyte layer and/or the second fixing member.