Wound Electrode Assembly Support Structure Against Plate Deformation
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Solution Overview
Problem
The electrode plates in conventional rechargeable batteries are prone to deformation, which affects battery performance.
Innovation Solution
A support member is provided in the winding structure of the electrode assembly, with at least a part of the support member being bent and arranged to provide a support force to the electrode plates at the outer side, preventing inward shrinkage and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electrode plates are wound to form a compact structure, then space utilization is improved, but the electrode plates become prone to deformation and shrinkage
Solution Approach 1:
The support member is divided into multiple segments (first support portion, second support portion, third support portion) that are distributed at different locations within the winding structure. Each segment independently supports electrode plates at critical positions, preventing overall deformation while maintaining compact winding.
Solution Approach 2:
Support members are strategically placed at specific locations where electrode deformation is most likely to occur (bending areas and straight areas). The support structure provides localized reinforcement without affecting the overall compactness of the wound battery cell.
2Stability of the object's composition
If support members are added to prevent electrode deformation, then structural stability is improved, but device complexity increases
Solution Approach 1:
The support members are designed as thin, flexible components that can be easily integrated into the winding structure. These thin-film support elements provide necessary mechanical reinforcement without significantly increasing the overall complexity or volume of the electrode assembly.
Solution Approach 2:
The support members serve multiple functions: they prevent electrode shrinkage, maintain spacing between electrodes, support bending areas, and provide structural integrity. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Shape
If support force is applied to outer side electrode plates, then inward shrinkage is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The support members are pre-positioned and fixed to the separator before the winding process begins. This preliminary placement ensures that support elements are correctly positioned at bending areas and straight areas, reducing the precision requirements during the actual winding operation.
Solution Approach 2:
The separator serves as an intermediary substrate to which support members are attached. This intermediary approach simplifies positioning, as support members are fixed to the flexible separator rather than requiring direct precision placement among stacked electrodes during winding.
Data Source
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AI summary
Embodiments of the present application provide an electrode assembly, a battery cell, a battery, and a method and a device for manufacturing an electrode assembly, which belong to the technical field of batteries. Where, the electrode assembly includes a first electrode plate, a second electrode plate, and a support member. The first electrode plate and the second electrode plate are wound in a winding direction to form a winding structure, and the winding structure includes a bending area. At least a part of the support member is bent and arranged in the bending area, and the support member is configured to provide a support force to a part of the first electrode plate and/or the second electrode plate located at an outer side of the support member. The support member can provide a support force to the part of the first electrode plate and/or the second electrode plate located at the outer sided of the support member, that is, the support member can provide a support force to an electrode plate located at the outer side of the support member, so that the electrode plate at the outer side of the support member is not easy to shrink and deform inward, the structural stability of the entire electrode assembly is improved, and the battery performance is ensured.