Movable Spray Nozzles for Wrinkle-Free Electrode Drying
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Solution Overview
Problem
Existing drying methods for electrode sheets in secondary batteries often result in thermal wrinkles due to uneven drying, particularly in uncoated areas, leading to inefficiencies and process issues.
Innovation Solution
A water spraying device with movable spray nozzles that can adjust their position horizontally, vertically, and rotate in an arc, combined with an electrode drying device that uses high-temperature heat and controlled humidity to minimize thermal wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature heat is applied to dry the electrode sheet, then drying efficiency is improved, but thermal wrinkles occur in uncoated areas
Solution Approach 1:
The patent applies different temperature conditions to different areas of the electrode sheet. The uncoated areas are protected from high-temperature heat through water spraying, while the coated areas receive the full drying effect. This local differentiation of thermal treatment prevents thermal wrinkles in uncoated regions while maintaining drying efficiency in coated regions.
Solution Approach 2:
Water is introduced as an intermediary substance to mediate the thermal interaction between the heating source and the uncoated areas of the electrode sheet. The water absorbs excess heat in uncoated regions, preventing thermal wrinkles, while allowing the drying process to proceed effectively in coated areas where the slurry needs thermal treatment.
2Area of stationary object
If the electrode sheet is dried in an overlapped state on a roll, then space utilization is improved, but uneven drying occurs between inside and outside
Solution Approach 1:
The patent extracts the problematic thermal interaction from the drying process by introducing water spraying specifically targeted at uncoated areas. This separation allows the overlapped drying configuration to maintain its space efficiency while the water spraying compensates for the uneven heating, ensuring uniform drying quality across all layers including inside and outside regions.
3Device complexity
If conventional drying methods are used, then process simplicity is maintained, but thermal wrinkles cannot be effectively prevented
Solution Approach 1:
The patent integrates water spraying functionality into the existing drying device, creating a multi-functional system that combines drying and thermal protection in a single apparatus. This universal approach allows the device to perform both drying and wrinkle prevention functions without requiring completely separate systems, thus limiting the increase in complexity while effectively solving the thermal wrinkle problem.
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 effectively dries electrode sheets while minimizing thermal wrinkles, enhancing process efficiency and ensuring uniform drying across the sheet.
Implementation Method 1
a water spraying device... that sprays either water or air onto the electrode sheet passing through the sheet entrance exit inside the oven main body
Implementation Method 2
a drying unit that dries the electrode sheet by transferring high-temperature heat to the electrode sheet
Data Source
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AI summary
The present disclosure relates to a water spraying device and an electrode drying device including the same, wherein the water spraying device of the present disclosure includes: a base part; a spraying part including at least one spray nozzle for spraying fluid; and an adjusting part that connects the spraying part to the base part and linearly moves and rotationally moves the spraying part with respect to the base part, wherein the spray nozzle is characterized in that it is configured to move horizontally and vertically, or rotate in an arc by the adjusting part.