Nozzle Assembly for Uniform Sub-20 μm Electrode Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods struggle to achieve a uniform coating thickness of less than 20 μm on electrode sheets for lithium-ion batteries, particularly in electric vehicles, which is crucial for preventing lithium dendrite growth and ensuring safety.
Innovation Solution
A nozzle assembly with a recessed dam member and cover plate design, combined with a metering system, allows for precise control of fluid dispensing, enabling an extremely thin glue layer application on electrode sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating methods are used, then coating coverage is achieved, but coating uniformity and thickness control deteriorate (cannot achieve less than 20 μm uniform thickness)
Solution Approach 1:
The nozzle is segmented into multiple independent spray holes arranged in an array, each contributing to a specific portion of the coating. This segmentation allows precise control of fluid distribution across the electrode surface, achieving uniform thin coating thickness below 20 μm while maintaining complete coverage for battery safety
Solution Approach 2:
The spray holes are strategically positioned and sized to deliver localized fluid distribution matched to the specific coating requirements of different electrode regions. This local quality approach ensures optimal coating thickness and uniformity across the entire electrode surface, preventing lithium dendrite growth
2Quantity of substance
If coating thickness is reduced to less than 20 μm, then adhesive material usage is minimized, but coating uniformity becomes difficult to achieve
Solution Approach 1:
The system incorporates feedback control through the nozzle design that responds to fluid pressure and flow rate variations, automatically adjusting spray characteristics to maintain consistent coating thickness. This feedback mechanism enables minimal adhesive usage (below 20 μm) while preserving coating uniformity across the electrode surface
Solution Approach 2:
The nozzle design utilizes parameter changes in fluid dynamics, including pressure regulation and flow rate optimization, to achieve precise control over coating thickness. By adjusting these parameters, the system minimizes adhesive material usage while maintaining uniform coating quality
3Measurement precision
If conventional nozzles are used, then fluid dispensing is achieved, but precision and control over fluid flow deteriorate (cannot achieve extreme thinness and uniformity)
Solution Approach 1:
The nozzle is segmented into multiple independent spray holes arranged in a precise array pattern. This segmentation provides inherent flow distribution control without requiring complex external mechanisms, achieving high measurement precision in fluid flow control while managing device complexity through geometric design
Solution Approach 2:
The nozzle array structure provides self-regulating fluid distribution through its geometric configuration. The multiple spray holes automatically balance fluid flow across the electrode surface without requiring complex control systems, achieving precise fluid flow control while minimizing device complexity
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 enables the coating of electrode sheets with a thickness of less than 20 μm, effectively preventing lithium dendrite growth and enhancing the safety of lithium-ion batteries in electric vehicles.
Implementation Method 1
a recess is provided on one of two surfaces of the cover plate and the lip member facing each other, the recess being in fluid communication with the reservoir so that the fluid can flow out from the reservoir through the recess in a strip shape
Data Source
AI summary
The disclosure relates to a nozzle assembly, a dispensing system, an electrode sheet strip, and an electrode. The nozzle assembly includes a lip member configured to have an annular body portion and a dam member at the center; and a cover plate configured to be connected to the lip member. The, dam component is recessed relative to a surface of the lip member connected to the cover plate, so that a reservoir is formed between the cover plate and the dam component. The reservoir is in fluid communication with a rectangular opening; and a recess is arranged on one of the two surfaces of the cover plate and the lip member facing each other. The recess is in fluid communication with the reservoir so that fluid can flow out of the reservoir through the recess in a strip shape.