Power Storage Module Insulation Layout for Electrolyte Impregnation
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Solution Overview
Problem
Conventional power storage modules face challenges in ensuring effective impregnation of electrolyte solution into the stacked electrode assembly due to insulation sheets obstructing the flow, leading to poor liquid injection properties.
Innovation Solution
The power storage module incorporates an insulating sheet configuration with overlapping first and second insulating sheets that are partially welded, creating gaps for electrolyte solution to flow through, while maintaining insulation between the electrode assembly and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating sheet is provided between the stacked electrode assembly and the housing to ensure insulation, then insulation reliability is improved, but electrolyte solution impregnation into the electrode assembly deteriorates
Solution Approach 1:
The insulating sheet is divided into multiple segments (first insulating sheet and second insulating sheet) that are welded at discrete locations rather than forming a continuous barrier. This segmentation creates gaps between the sheets that allow electrolyte solution to penetrate through to the electrode assembly while maintaining insulation at the welded portions.
Solution Approach 2:
The insulating sheet has non-uniform properties: welded regions provide insulation and structural support, while unwelded gaps provide electrolyte solution pathways. This local variation in quality allows different regions of the same component to serve different functions simultaneously.
2Reliability
If the insulating sheet is made continuous to ensure complete insulation, then insulation between electrode assembly and housing is improved, but electrolyte solution flow paths are blocked
Solution Approach 1:
The continuous insulating sheet is replaced with segmented sheets welded at discrete locations. This creates a discontinuous structure that simultaneously provides insulation where needed (welded areas) and allows fluid passage where needed (gaps between sheets).
Solution Approach 2:
The gaps between the welded insulating sheets act as intermediaries that allow electrolyte solution to pass through the insulating barrier. These gaps serve as controlled pathways that mediate between the insulation requirement and the impregnation requirement.
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
Enhances the impregnation of electrolyte solution into the stacked electrode assembly by facilitating its flow through the gaps between the partially welded insulating sheets, ensuring effective liquid injection properties despite the module's elongated shape.
Implementation Method 1
The first insulating sheet and the second insulating sheet are welded together at a plurality of locations apart from each other in the second direction in the overlapped region
Data Source
AI summary
A power storage module includes a stacked electrode assembly including a plurality of electrodes stacked in a first direction. The stacked electrode assembly has a circumferential surface extending in a second direction perpendicular to the first direction, and facing a housing. The power storage module includes an insulating sheet portion disposed between the circumferential surface and the housing and covers the circumferential surface. The insulating sheet portion has first and second insulating sheets extending in the second direction and covering a portion of the circumferential surface. The first and second insulating sheets partially overlap in a circumferential direction of the stacked electrode assembly. The second direction is the longitudinal direction of the overlapped region where the first insulating sheet and the second insulating sheet overlap. The first and second insulating sheets are welded together at multiple locations separate from each other in the second direction in the overlapped region.