Dual-Sided Infrared Drying for Uniform Electrode Sheet Heating
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Solution Overview
Problem
Existing drying devices for electrode sheets face inefficiencies in drying thicker sheets uniformly, leading to issues such as crimping, warping, cracking, and sticking due to uneven thermal stresses across the sheet's surfaces.
Innovation Solution
A drying device with first and second infrared drying assemblies on opposite sides of the drying channel, emitting infrared radiation to uniformly heat both sides of the electrode sheet, utilizing materials like carbon black, micro-nano graphite powder, carbon nanotubes, and graphene to enhance absorption and reduce thermal stress differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot air is used for drying the electrode sheet, then the drying device is simple in structure, but the drying efficiency is low and cannot meet the demand for drying thicker electrode sheets at higher speed
Solution Approach 1:
The patent replaces the conventional hot air drying method (mechanical convection system) with an infrared drying system that uses infrared radiation for heating. This substitution enables penetrative heating of thicker electrode sheets, significantly improving drying efficiency while maintaining a relatively simple device structure through the use of infrared heating elements positioned above and below the drying channel.
2Productivity
If an infrared drying assembly is arranged above the electrode sheet for penetrative heating, then the drying efficiency is improved, but the electrode sheet cannot be heated uniformly causing crimping, warping, and cracking
Solution Approach 1:
The patent employs asymmetric heating arrangement with infrared drying assemblies positioned on both the upper and lower sides of the drying channel, allowing differential heating control. The first infrared drying assembly heats the upper surface while the second infrared drying assembly heats the lower surface, creating a balanced heating pattern that prevents thermal stress-induced deformations while maintaining high drying efficiency.
Solution Approach 2:
The patent transitions from single-sided (one-dimensional) infrared heating to dual-sided (two-dimensional) infrared heating by arranging heating assemblies on both upper and lower surfaces of the electrode sheet. This dimensional expansion enables uniform penetrative heating through the thickness of the electrode sheet, eliminating the heating non-uniformity that causes crimping, warping, and cracking.
3Device complexity
If single-sided infrared heating is applied, then the device structure is simple, but large thermal stress difference causes crimping, warping, cracking, and sticking to roller
Solution Approach 1:
The patent uses asymmetric dual-sided infrared heating arrangement where the first infrared drying assembly is positioned on the upper side of the drying channel and the second infrared drying assembly is positioned on the lower side. This configuration allows independent control of heating intensity on each side, balancing thermal stresses to prevent electrode sheet deformations and defects while maintaining a relatively simple overall device structure.
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 significantly increases drying efficiency, prevents crimping, warping, and cracking by uniformly heating both sides of the electrode sheet, reducing the risk of overbaking and energy consumption.
Implementation Method 1
a plurality of first infrared drying assemblies arranged on an inner wall of the first drying section and located on the first side of the drying channel; a plurality of second infrared drying assemblies arranged on the inner wall of the first drying section and located on the second side of the drying channel
Data Source
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AI summary
A drying device is provided and is configured to dry an electrode sheet (200). The drying device includes: a box body (10), a plurality of first infrared drying assemblies (20), and a plurality of second infrared drying assemblies (30). The box body defines a drying channel (I) extending through the box body. The electrode sheet is capable of being conveyed in the drying channel; the drying channel has a first side (11) and a second side (12) opposite to the first side; the box body includes a first drying section (11) arranged along a conveying direction of the electrode sheet. The plurality of first infrared drying assemblies are arranged on an inner wall of the first drying section and located on the first side of the drying channel. The plurality of second infrared drying assemblies are arranged on the inner wall of the first drying section and located on the second side of the drying channel.