Multi-Lug Winding Structure for Lithium-Ion Battery Rate Performance
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Solution Overview
Problem
Current lithium-ion batteries face challenges in achieving high capacity and rate performance while minimizing internal resistance, self-discharge, and complexity in design, particularly in the context of electric vehicles and energy storage applications.
Innovation Solution
A lithium-ion battery cell design featuring multiple positive and negative lugs arranged in a laminated or staggered structure, wound to form a square cell with specific lug spacing and welding techniques, enhancing current discharge performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of lugs is increased to reduce internal resistance and improve rate performance, then the rate performance is improved, but the preparation efficiency decreases and displacement occurs between adjacent layers
Solution Approach 1:
The patent divides the battery structure into multiple independent winding units, each containing a subset of the total lugs. This segmentation allows parallel processing during assembly, improving preparation efficiency while maintaining the high number of lugs needed for excellent rate performance and low internal resistance.
Solution Approach 2:
The patent transitions from a traditional planar arrangement to a three-dimensional winding structure where lugs are distributed across multiple layers and positions. This dimensional change enables better spatial utilization, preventing displacement between adjacent layers while accommodating a large number of lugs for high power output.
2Power
If a laminated battery structure is used to achieve high rate performance and large number of lugs, then the rate performance is improved, but the process complexity increases and self-discharge occurs
Solution Approach 1:
The patent merges the advantages of winding and lamination structures by implementing a winding-based design that achieves multi-lug configuration without requiring complex lamination processes. This integration simplifies manufacturing while maintaining high rate performance through efficient current collection from multiple lugs.
Solution Approach 2:
The patent employs a simpler winding process that uses readily available materials and standard manufacturing techniques, avoiding the complex and costly lamination process. This approach reduces process complexity and eliminates self-discharge issues associated with lamination while achieving the desired high rate performance.
3Quantity of substance
If multiple single batteries are used to achieve high capacity, then the capacity is improved, but the battery management module becomes complex and service life is reduced
Solution Approach 1:
The patent merges multiple electrode plates and lugs into a single integrated battery cell through the winding structure. This consolidation achieves high capacity within one cell, eliminating the need for complex battery management modules required when managing multiple separate batteries, and ensures consistent service life across the entire cell.
Data Source
Figure 1A~2A
Figure 2B~3
Figure 4~6
AI summary
The present invention disclosures a lithium-ion battery cell and a lithium-ion battery, wherein the lithium-ion battery cell comprises a positive plate, a separator and a negative plate. The positive and negative plates in a unfold state are sequentially arranged with a plurality of positive and negative lugs, the positive and negative plates are separated by the separator and are wound to form the lithium-ion battery cell, and the plurality of positive and negative lugs form a laminated lug structure or a structure of staggered lug arrangement. The present invention discloses a lithium-ion battery cell and a lithium-ion battery, wherein the lithium-ion battery cell comprises a positive plate, a separator and a negative plate. The positive and negative plates in a unfold state are sequentially arranged with a plurality of positive and negative lugs, the positive and negative plates are separated by the separator and are wound to form the lithium-ion battery cell, and the plurality of positive and negative lugs form a laminated lug structure or a structure of staggered lug arrangement. The lithium-ion battery cell and the lithium-ion battery in the present invention can improve the rate performance of the battery, the consistency of the cell, are beneficial to grouping and modular expansion, ensure a stable operation, and prolong the service life. They can also enhance the safety performance and production efficiency, and reduce the burr generation rate at the edge of plates and the self-discharge rate, thereby improving the stability of battery.