Wound Power Storage Cell Edge Insulation Against Electrode Shorts
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Solution Overview
Problem
In power storage cells, there is a risk of the positive electrode metal foil contacting the negative electrode composite material layer at one end of the electrode assembly, which can lead to electrical shorts and reduced battery performance.
Innovation Solution
The design includes an electrode assembly with insulating members at the edges of the electrode sheets, where the distance between insulating pieces is carefully controlled to prevent contact between the metal pieces and the composite material layers, and welded portions are formed to secure the insulating members to the separator, ensuring that the metal pieces extend towards the winding axis without touching the opposing composite material layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrode assembly is wound to surround a winding axis, then the battery structure is compact and efficient, but the positive electrode metal foil may contact the negative electrode composite material layer at one end, causing electrical shorts
Solution Approach 1:
An insulating member is introduced as an intermediary element between the positive electrode metal foil and the negative electrode composite material layer. This insulating member includes an insulating piece that contacts the positive electrode metal foil and a welded portion that contacts the separator, physically preventing direct contact between the positive and negative electrodes while maintaining the compact wound structure.
Solution Approach 2:
The insulating member is segmented into distinct functional portions: an insulating piece that provides electrical isolation and a welded portion that provides mechanical attachment to the separator. This segmentation allows each portion to perform its specific function effectively, ensuring both electrical insulation and structural stability.
2Reliability
If insulating members are added to prevent electrode contact, then electrical insulation is improved, but the device complexity increases
Solution Approach 1:
The insulating member combines multiple functions into a single integrated component: electrical insulation, mechanical support, and attachment to the separator. By merging these functions into one element rather than using separate components, the design achieves reliable electrical insulation while minimizing the increase in device complexity.
Solution Approach 2:
The insulating member serves multiple purposes simultaneously: it provides electrical insulation between electrodes, maintains structural integrity of the wound assembly, and anchors the electrode edges through welding to the separator. This multi-functionality reduces the need for additional separate components.
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 suppresses contact between the positive and negative electrode metal pieces and composite material layers, enhancing the electrical insulation and stability of the power storage cell, thereby improving its performance and preventing electrical shorts.
Implementation Method 1
The first insulating member includes a welded portion welded to the separator
Data Source
AI summary
A power storage cell includes a first electrode sheet, a second electrode sheet and a separator, the first electrode sheet includes a first current collector and a first electrode composite material layer, the first current collector includes a first uncoated portion, the first uncoated portion includes a plurality of first metal pieces located at a first end portion and arranged in a winding direction of a sheet body, the first metal pieces extend toward a winding axis, and an at least one insulating member includes a first insulating member formed at an edge portion.