Electrode Coating Mold Layout for Stable Uncoated Interfaces
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Solution Overview
Problem
The existing electrode coating process in secondary battery manufacturing often results in issues such as dragging, lifting, or sinking of the composite at the interface between coated and uncoated portions, leading to deviations in the N/P ratio and potential short circuits due to localized changes in loading levels, which can cause lithium precipitation.
Innovation Solution
An electrode coating apparatus and method using a modular mold with a coater to dispense electrode active material slurry, forming a coated portion defined by the modular mold, which includes a finishing mold, uncoated portion mold, and optional length adjustment mold, ensuring precise control over the coated area and preventing interface issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a coater moves along the electrode substrate to apply slurry, then the electrode active material can be applied to a predetermined area and shape, but dragging, lifting, or sinking occurs at the interface between coated and uncoated portions
Solution Approach 1:
A mold is placed on the electrode substrate before the coating process to predefine the coating area boundaries. The mold prevents slurry from spreading beyond the intended area and stabilizes the interface between coated and uncoated portions during the coating process, eliminating dragging, lifting, or sinking issues.
Solution Approach 2:
The mold acts as an intermediary tool between the coater and the electrode substrate. It provides a physical barrier that controls slurry flow and maintains clear separation between coated and uncoated areas, preventing interface defects without requiring precise coater positioning.
2Quantity of substance
If the composite is applied to the electrode substrate, then the electrode active material coverage is improved, but the N/P ratio distorts due to localized loading level changes at the interface
Solution Approach 1:
The mold is positioned on the electrode substrate before coating to predefine the exact coating area. This ensures that the electrode active material is applied only within the intended boundaries, preventing localized loading level increases at the interface and maintaining accurate N/P ratio control.
3Quantity of substance
If the coating area is extended to increase capacity, then the electrode performance is improved, but the risk of lithium precipitation and short circuit increases
Solution Approach 1:
The mold defines the coating area boundaries before slurry application, ensuring that the electrode active material is applied only within the safe, intended area. This prevents excessive loading levels that could lead to lithium precipitation and short circuits, while still allowing maximum safe capacity utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents deviations in the coated portion length and N/P ratio distortion, reducing the risk of short circuits and lithium precipitation, while allowing for various composite coating patterns and eliminating the need for a separate operation to cover the interface.
Implementation Method 1
a coater configured to dispense an electrode active material slurry on the electrode substrate on which the modular mold is disposed to form a coated portion
Data Source
AI summary
The present disclosure relates to an electrode coating apparatus and an electrode coating method. The electrode coating apparatus may include a modular mold configured to be positioned on an electrode substrate, and a coater configured to dispense an electrode active material slurry on the electrode substrate upon the modular mold being placed on the electrode substrate, thereby forming a coated portion on the electrode substrate in an area defined by the modular mold.