Segmented Coating Roller Assembly for Lithium Plating Control
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Solution Overview
Problem
Lithium precipitation phenomena on electrode plates of batteries deteriorate performance and safety, necessitating a technology to suppress this issue.
Innovation Solution
A coating roller assembly with multiple coating portions is used to form differentiated coating layers on electrode plates, adjusting separator resistance and current density distribution to alleviate lithium precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform coating is applied across the entire electrode plate, then manufacturing simplicity is maintained, but lithium precipitation occurs in the middle region due to excessive current density
Solution Approach 1:
The coating roller is divided into multiple independent coating portions (first, second, and third coating portions) that can be independently controlled. Each coating portion applies coating material to different regions of the electrode plate, enabling differentiated coating characteristics across the plate surface. This segmentation allows the middle region to have different coating properties (higher separator resistance) compared to the side regions, thereby reducing current density in the middle and preventing lithium precipitation.
Solution Approach 2:
Different regions of the electrode plate are given different coating qualities through the differentiated coating portions. The middle region receives coating with higher separator resistance characteristics, while the side regions receive coating with lower separator resistance. This local quality differentiation addresses the specific problem of excessive current density in the middle region without unnecessarily complicating the entire coating system.
2Reliability
If coating parameters are adjusted to increase separator resistance in the middle region, then current density is reduced and lithium precipitation is alleviated, but coating process complexity increases
Solution Approach 1:
The coating system incorporates adjustable and controllable coating parameters for each coating portion, including coating width, coating amount, and coating material composition. These parameters can be dynamically adjusted during the coating process to achieve the desired differentiated coating characteristics. The coating portions can be independently controlled to optimize separator resistance in different regions while maintaining manufacturing flexibility.
3Reliability
If differentiated coating with multiple coating layers is implemented, then current density distribution is improved and lithium precipitation is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The coating roller is segmented into multiple independent coating portions that can be precisely controlled to achieve specific coating patterns. Each coating portion corresponds to a specific region of the electrode plate and can be independently adjusted to achieve the desired coating thickness and material distribution. This segmentation enables precise control over the coating layers without requiring excessive overall manufacturing precision.
Data Source
AI summary
A coating roller assembly for coating an electrode plate of a battery, where the coating roller assembly includes: coating rollers; and coating portions, disposed around the coating rollers. The coating portions include a first coating portion, a second coating portion, and a third coating portion, where the first coating portion is configured to form a first coating layer portion, the second coating portion is configured to form a second coating layer portion, and the third coating portion is configured to form a third coating layer portion between the first coating layer portion and the second coating layer portion. A coating method for coating an electrode plate of a battery with the foregoing coating roller assembly, an electrode plate obtained through the coating roller assembly or the coating method, and a battery including the electrode plate.