Wound Electrode Assembly Reinforcement Against Central Collapse
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Solution Overview
Problem
Lithium precipitation in wound electrode assemblies of battery cells leads to reduced service life due to central collapse and deformation during charging and discharging processes.
Innovation Solution
Incorporating a reinforcing part on the first electrode plate segment, which is wound to form a strong self-supporting structure, enhancing deformation resistance and reducing lithium precipitation by maintaining structural integrity and ion transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a wound electrode assembly structure is used, then the battery cell can achieve compact design and high energy density, but central collapse and deformation occur during charging and discharging, leading to lithium precipitation and reduced service life
Solution Approach 1:
The electrode plate is divided into a first segment and a second segment along the winding direction. The first segment forms an inner turn layer and the second segment forms an outer turn layer, allowing differential structural design to prevent central collapse while maintaining overall integrity
Solution Approach 2:
A reinforcing part is added specifically to the first segment of the electrode plate where central collapse occurs during winding. This localized reinforcement enhances deformation resistance at the critical inner turn layer without affecting the overall energy density of the battery cell
2Volume of moving object
If the electrode plate is wound tightly to form a compact structure, then space utilization is improved, but deformation resistance decreases, causing central collapse and lithium precipitation
Solution Approach 1:
The reinforcing part is selectively applied to the first segment of the electrode plate to provide localized deformation resistance enhancement at the inner turn layer, allowing tight winding for compact structure while preventing collapse through targeted reinforcement
Solution Approach 2:
The electrode plate incorporates a composite structure with a base layer and a reinforcing part, combining materials with different mechanical properties to achieve both compact winding capability and sufficient deformation resistance against central collapse
Data Source
AI summary
An electrode assembly includes first and second electrode plates having opposite polarities, and stacked and wound in a winding direction to form a wound structure. The first electrode plate has a first winding starting end and includes a first segment and a second segment continuously arranged along the winding direction. The first segment is wound from the first winding starting end along the winding direction to form an inner turn layer, and the second segment is wound from a connecting position where it is connected with the first segment along the winding direction to form an outer turn layer. The first segment is provided with a reinforcing part wound to the connecting position along the winding direction and configured to reinforce the first segment.