Battery Electrode Assembly Segmented Separator Winding
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Solution Overview
Problem
In high capacity secondary batteries, accurately arranging unit electrodes with separators becomes increasingly difficult as the number of windings increases, leading to inefficiencies in electrode assembly.
Innovation Solution
An electrode assembly structure where first and second electrodes are arranged in an alternating stack with first and second separators wound between them, ensuring precise positioning and alignment of electrodes, with the first separator interposed between adjacent first and second electrodes and the second separator interposed between adjacent portions of the first separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of winding increases to achieve high capacity, then the battery capacity increases, but the electrode arrangement precision deteriorates
Solution Approach 1:
The separator is divided into multiple segments (first separator and second separator) that are alternately wound with electrodes. This segmentation allows for better control and positioning of electrodes at different levels of the winding structure, maintaining arrangement precision even as the total number of windings increases to achieve high capacity.
Solution Approach 2:
The second separator acts as an intermediary component interposed between adjacent portions of the first separator. This intermediary structure provides additional positioning reference and mechanical support, ensuring that electrodes maintain precise alignment throughout the multi-layer winding structure.
2Quantity of substance
If the number of windings increases, then the battery capacity increases, but the structural integrity deteriorates
Solution Approach 1:
The separator system is segmented into first and second separators that are alternately arranged. This segmentation creates a more distributed and balanced structural framework that maintains structural integrity across multiple windings, preventing deformation and ensuring consistent electrode spacing throughout the battery assembly.
Solution Approach 2:
The second separator is nested within the structure formed by the first separator and electrodes, creating a hierarchical nested arrangement. This nested structure provides multiple levels of structural support that maintain integrity as the battery capacity increases through additional windings.
3Quantity of substance
If the number of windings increases, then the battery capacity increases, but the electrode alignment deteriorates
Solution Approach 1:
The separator is segmented into alternating first and second separators that serve as positioning references at different levels. This segmentation ensures that electrodes remain properly aligned throughout the entire winding structure, even as the number of windings increases to achieve high capacity.
Solution Approach 2:
The second separator serves as an intermediary positioning element between portions of the first separator, providing continuous alignment reference throughout the winding structure. This intermediary structure prevents misalignment and maintains precise electrode positioning across multiple windings.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An electrode assembly for a battery and a method of manufacturing the same are disclosed. The electrode assembly includes a first separator wound to form a plurality of stacked first separator members; a second separator wound with the first separator to form a plurality of stacked second separator members to be respectively positioned between the first separator members; and a plurality of electrode members positioned between the first separator members and the second separator members. An inner surface of one of the first separator members positioned at the innermost side and an inner surface of one of the second separator members positioned at the innermost side face each other.