Secondary Battery Electrode Assembly for Stable Series Tab Connection
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Solution Overview
Problem
Existing electrode assemblies for pouch-type secondary batteries lack a stable and suitable electrical connection between electrode tabs of adjacent battery cells, which is crucial for high voltage and high output applications.
Innovation Solution
The electrode assembly features electrode tabs on both ends, allowing for serial connection between battery cells. The positive and negative electrode plates have uncoated portions for tab attachment, ensuring stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrode tabs are configured for series connection between battery cells, then voltage and output characteristics are improved, but electrical connection stability between adjacent cells deteriorates
Solution Approach 1:
The electrode plate is divided into multiple uncoated portions along the winding direction, with each uncoated portion serving as a separate tab attachment region. This segmentation allows multiple tab connections at different positions, distributing the electrical connection load and improving overall connection stability while maintaining high voltage and output capabilities through series configuration
Solution Approach 2:
The invention transitions from a single-point tab connection to multi-point distributed connections along the winding direction (one-dimensional extension). By placing uncoated portions and tabs at multiple positions along the length of the electrode plate, the electrical connection is distributed across multiple points, enhancing stability without compromising the series connection architecture needed for high voltage
2Reliability
If uncoated portions are provided at winding start and finish ends, then tab attachment stability is improved, but electrode plate manufacturing complexity increases
Solution Approach 1:
The electrode plate is designed with localized uncoated portions at specific regions (winding start end, winding finish end, and optionally center) while the rest of the plate maintains full coating. This local modification approach provides stable tab attachment areas without requiring complete redesign of the entire electrode plate manufacturing process, balancing manufacturing ease with connection reliability
Solution Approach 2:
The uncoated portions are pre-defined during the electrode plate manufacturing stage, creating ready-to-connect regions before assembly. This preliminary preparation of tab attachment areas simplifies the overall manufacturing process by integrating the connection design into the electrode plate fabrication rather than requiring post-assembly modifications
Data Source
AI summary
An electrode assembly for a battery includes: a positive electrode plate including a positive electrode current collector plate, a positive electrode active material layer on a surface of the plate, at least one uncoated portion at which no positive electrode active material is applied, and at least one positive electrode tab electrically attached and coupled to the uncoated portion, and protruding upwardly from an upper portion of the electrode assembly; a negative electrode plate including a negative electrode current collector plate, a negative electrode active material layer on a surface of the plate, at least one uncoated portion in which no negative electrode active material is applied, at least one negative electrode tab electrically attached and coupled to the uncoated portion, and protruding downwardly from a lower portion of the electrode assembly; and a separator between the positive electrode plate and the negative electrode plate.