Electrode Assembly Layout to Suppress Battery Lithium Plating
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Solution Overview
Problem
The challenge of lithium plating in battery cells, which can lead to safety issues, is not adequately addressed in existing battery technologies.
Innovation Solution
The electrode assembly design includes a negative and positive electrode plate structure where the active substance capacity per unit area of the main body portions is strategically configured to be higher or lower than the edge portions, reducing the likelihood of lithium plating by optimizing the active material distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active substance capacity per unit area is uniformly distributed across the electrode plate, then the manufacturing process is simple, but lithium plating occurs in the middle area reducing safety
Solution Approach 1:
The patent applies local quality by creating different active substance capacity distributions in different regions of the electrode plate. The middle area has a higher active substance capacity per unit area compared to the edge areas, which locally optimizes the electrode structure to prevent lithium plating in the middle region while maintaining appropriate capacity at the edges.
2Reliability
If the active substance capacity per unit area of the negative electrode main body portion is increased to prevent lithium plating, then lithium plating resistance improves, but the device complexity increases
Solution Approach 1:
The patent segments the electrode plate into distinct regions: a middle area and edge areas, with further subdivision into main body portions and edge portions. This segmentation allows each region to have optimized active substance capacity characteristics, with the main body portion having higher capacity density to prevent lithium plating while edge portions maintain appropriate capacity levels.
Data Source
AI summary
An electrode assembly, a battery cell, a battery, and a manufacturing method and device for the electrode assembly. The electrode assembly includes a negative electrode plate and a positive electrode plate. The negative electrode plate includes a negative active material layer located in the straight area, and the positive electrode plate includes a positive active material layer located in the straight area. A first direction is perpendicular to an axial direction of a winding structure. The negative active material layer includes a negative electrode main body portion and negative electrode edge portions located on both sides of the negative electrode main body portion.