Battery Electrode Roll Pressing With Temporary Label Support
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Solution Overview
Problem
The roll press method for producing electrode plates in rechargeable batteries often results in defects and wrinkles in the uncoated portions due to stress concentration and elongation differences between coated and uncoated areas, making it difficult to achieve optimal density and quality.
Innovation Solution
A device and method that apply a label between the coated portions of the electrode plate to distribute pressing stress evenly, using an uncoiler, label applicator, roll press, and label separator to minimize wrinkles by maintaining alignment and separating the label after pressing, thereby reducing elongation differences and stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If roll press method is applied to press the electrode plate, then the density of the coated portion is improved, but the uncoated portion develops defects and wrinkles due to stress concentration and elongation differences
Solution Approach 1:
A label is introduced as an intermediary material applied to the uncoated portion of the electrode plate before pressing. The label acts as a mediator that distributes pressing stress evenly across the uncoated area, preventing stress concentration and elongation differences that cause wrinkles. The label is temporarily attached during the pressing process and then removed, serving its stress-distribution function only when needed.
Solution Approach 2:
The physical state and properties of the uncoated portion are temporarily changed by applying the label material. The label modifies the surface characteristics and mechanical properties of the uncoated area, enabling it to withstand pressing forces without developing wrinkles. After pressing, the label is removed and the uncoated portion returns to its original state.
2Object-affected harmful factors
If the label is applied to the uncoated portion before pressing, then stress distribution is improved and wrinkles are reduced, but the device complexity increases due to additional components
Solution Approach 1:
The pressing device is designed with multi-functional components that perform multiple operations. The label applicator can apply labels to different positions and patterns on the electrode plate, and the label separator can remove labels from various configurations. This universality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The label material itself performs the stress-distribution function during pressing, eliminating the need for complex stress-distribution mechanisms in the pressing device. The label applies its own stabilizing effect passively during the pressing process, and the simple applicator and separator components handle the label management without requiring sophisticated control systems.
3Manufacturing precision
If the label is applied precisely aligned with the uncoated portion, then pressing quality is improved, but the alignment detection and control complexity increases
Solution Approach 1:
The label is designed with distinct visual characteristics such as color differences or pattern features that make it easily detectable by alignment vision systems. These visual properties enable simple optical sensors or cameras to detect the label's position and orientation relative to the uncoated portion, facilitating alignment verification without complex measurement systems.
Solution Approach 2:
An alignment vision system provides feedback on the label's position and alignment status to the control system. This feedback mechanism enables real-time detection and correction of alignment deviations, ensuring precise positioning of the label on the uncoated portion before pressing without requiring overly complex detection equipment.
Data Source
AI summary
A device for pressing an electrode plate of a rechargeable battery, the device including an uncoiler configured to supply a label from an inflow side of an electrode plate having a first coated portion and a second coated portion coated with an active material slurry and an uncoated portion between the first coated portion and the second coated portion, a label applicator configured to apply the label to the uncoated portion, a roll press configured to press the first coated portion and the second coated portion of the electrode plate in which the label is applied to the uncoated portion together with the label and a label separator configured to separate the pressed label from the uncoated portion of the pressed electrode plate.