Wound Folded Separator Electrode Assembly Alignment
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Solution Overview
Problem
High-capacity secondary batteries face challenges in accurately aligning electrode members and achieving structural reinforcement in their electrode assemblies, particularly in jellyroll-type configurations, which can lead to structural weaknesses.
Innovation Solution
The electrode assembly features electrode members stacked along a reference line with a zigzag folded separator and wound portions that structurally reinforce the assembly, allowing for precise alignment and enhanced structural integrity by alternating winding directions of the wound portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a jellyroll-type electrode assembly is used, then high capacity can be achieved, but accurate alignment of electrode members becomes difficult
Solution Approach 1:
The separator is divided into multiple sections: folded portions that create separation between electrode members and wound portions that provide structural support. This segmentation allows the electrode members to be accurately aligned while maintaining high capacity through the jellyroll configuration.
Solution Approach 2:
The wound portions of the separator act as intermediary structural elements that mediate between the folded separator sections and the electrode members. These wound portions provide the necessary support to maintain alignment accuracy while allowing the high-capacity jellyroll design to function.
2Strength
If a zigzag folded separator is used, then structural reinforcement is achieved, but manufacturing complexity increases
Solution Approach 1:
The separator structure is segmented into folded portions for separation and wound portions for reinforcement. This segmentation provides structural strength while keeping each component relatively simple in form, balancing strength requirements with manufacturability.
Solution Approach 2:
The separator performs multiple functions: the folded portions provide separation between electrode members, while the wound portions provide structural reinforcement. This multi-functionality achieves structural strength without requiring additional separate components, thereby limiting the increase in manufacturing complexity.
Data Source
AI summary
An electrode assembly for a secondary battery and a secondary battery having the same, the electrode assembly including electrode members disposed in a stack and divided into groups; and a first separator having folded portions disposed between the electrode members, and wound portions extending from the folded portions and wrapped around the groups.