Electrode Drying Moisture Nozzle for Wrinkle-Free Non-Coating Parts
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Solution Overview
Problem
During the drying process of electrode sheets in secondary batteries, non-coating parts are prone to wrinkling or cracking due to uneven shrinkage caused by residual moisture and solvent distribution, leading to quality deterioration.
Innovation Solution
A moisture supply device is integrated into the electrode drying device, comprising a water spray nozzle to apply moisture to non-coating parts, a water storage tank, and a pump to control the moisture supply, along with a flow control system to regulate the moisture flow based on real-time measurement and detection, ensuring uniform drying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot air drying is applied to the electrode sheet, then drying efficiency is improved, but non-coating parts develop wrinkles or cracks due to uneven shrinkage
Solution Approach 1:
The patent applies different treatment to different parts of the electrode sheet: the coating part is dried with hot air while the non-coating part receives moisture supply through a dedicated nozzle. This local differentiation prevents uniform shrinkage stress from concentrating on the non-coating part, thereby avoiding wrinkles and cracks while maintaining overall drying efficiency.
Solution Approach 2:
The moisture supply nozzle provides preliminary anti-action by supplying moisture to the non-coating part before the hot air causes excessive shrinkage. This preemptive moisture supply counteracts the drying-induced shrinkage stress, preventing the formation of wrinkles or cracks before they occur.
2Manufacturing precision
If moisture is supplied to non-coating parts, then wrinkle and crack prevention is improved, but device complexity increases
Solution Approach 1:
The moisture supply nozzle is integrated into the existing drying device structure, merging the moisture supply function with the hot air drying system. This integration allows the device to perform both drying and moisture supply functions without requiring completely separate systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The drying device is enhanced with multi-functionality by incorporating a moisture supply capability alongside the existing hot air drying function. The single device now performs dual functions: drying the coating part with hot air and preventing wrinkles/cracks in the non-coating part through moisture supply, reducing the need for additional separate equipment.
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
Prevents wrinkles and cracks in non-coating parts by stabilizing moisture supply, improving electrode quality through precise moisture control, and ensuring consistent manufacturing outcomes.
Implementation Method 1
a water spray nozzle (11) for spraying moisture on the non-coating part (3a) of an electrode sheet (3) being transferred into the drying oven (5)
Implementation Method 2
hot air supplied from a supply fan of a hot air supply device (101) is sprayed onto the electrode sheet (105) by a nozzle installed in a drying oven (103) through a duct (107), and the electrode sheet (105) is dried by convection of the hot air supplied in the drying oven (103)
Data Source
AI summary
An electrode drying device includes a drying oven, a hot air spray nozzle, and a moisture supply device. The electrode drying device includes an interior space for drying an electrode sheet. The hot air spray nozzle sprays hot air on an electrode sheet being transferred into the drying oven. The moisture supply device includes a water spray nozzle, a water storage tank, and a pump. The water spray nozzle sprays moisture on a non-coating part of an electrode sheet. The water storage tank stores water and the pump is installed in a water storage tank to supply water to a water spray nozzle. The hot air spray nozzle dries an electrode sheet by spraying hot air, and the water spray nozzle may spray moisture on the non-coating part of the electrode sheet.