Electrode Sheet Nozzle Layout for Compact Upstream Hot-Air Drying
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Solution Overview
Problem
Existing electrode sheet drying apparatuses have limited flexibility in arranging hot air blowers due to their large size in the conveying direction, which increases the overall size of the apparatus and reduces efficiency in drying the undried active material layer.
Innovation Solution
The electrode sheet drying apparatus features hot air blowers with nozzles that blow band hot air in a second thickness direction opposite to the first, allowing the air to travel along the undried active material layer over a longer distance without a spread prevention part, reducing the blower's size and enabling closer arrangement, thus increasing flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spread prevention part is provided at the upstream side of the nozzle to prevent band hot air from spreading in the first thickness direction, then the hot air can be directed more effectively along the undried active material layer, but the overall size of the hot air blower in the conveying direction increases
Solution Approach 1:
The invention removes the spread prevention part (second wall) from the hot air blower structure. Instead of using a physical barrier to prevent hot air spreading, the design relies on the nozzle's guide surfaces and the natural flow characteristics to direct hot air along the active material layer, thereby reducing the blower's size in the conveying direction while maintaining drying effectiveness
Solution Approach 2:
The invention changes the parameters of the nozzle, specifically the angle of the guide surfaces relative to the active material layer. By optimizing this angle, the hot air flow is naturally directed along the layer without requiring additional spread prevention structures, thus resolving the contradiction between drying efficiency and compact size
2Reliability
If the overall size of the hot air blower in the conveying direction is large, then the spread prevention part can be included, but the flexibility of arrangement of hot air blowers is reduced and the apparatus size increases
Solution Approach 1:
By removing the spread prevention part, the invention reduces the blower's footprint in the conveying direction, enabling more flexible arrangement of multiple blowers along the drying apparatus without increasing the overall apparatus size, while maintaining effective hot air direction control through optimized nozzle geometry
3Length of moving object
If the hot air blowers are arranged at a larger pitch to accommodate their size, then each blower has sufficient space, but the number of blowers that can be installed decreases and drying efficiency is reduced
Solution Approach 1:
By eliminating the spread prevention part, the invention reduces the required spacing between adjacent blowers, allowing more blowers to be installed in the same apparatus length, thereby increasing drying efficiency through multiple sequential heating zones
Solution Approach 2:
The invention enables more effective segmentation of the drying process into multiple zones by allowing closer placement of individual blowers, each contributing to the progressive drying of the active material layer as it moves through the apparatus
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
This configuration allows for efficient drying of the undried active material layer over a longer distance, reducing the size of the apparatus and enhancing the flexibility of blower arrangement, while maintaining effective drying performance.
Implementation Method 1
The nozzle is configured to blow band hot air toward an obliquely upstream side from between a first upstream-side edge that is an edge at the upstream side of the first guide surface and a second upstream-side edge that is an edge at the upstream side of the second guide surface through between the first guide surface and the second guide surface
Implementation Method 2
The nozzle includes a first hot air guide having a first guide surface that advances in the first thickness direction toward a downstream side in the conveying direction, and a second hot air guide located in the second thickness direction with respect to the first guide surface and having a second guide surface facing and parallel to the first guide surface
Implementation Method 3
hot air is blown onto the undried active material layer while the undried electrode sheet is being conveyed in the longitudinal direction inside the electrode sheet drying apparatus. Thus, the undried active material layer is heated and dried
Data Source
AI summary
An electrode sheet drying apparatus includes a plurality of hot air blowers each having a nozzle. The nozzle has a first hot air guide having a first guide surface, a second hot air guide having a second guide surface. The nozzle is configured to blow band hot air toward an obliquely upstream side. An angle formed between the first guide surface and an undried active material layer is set to an angle at which the band hot air travels toward an upstream side along the undried active material layer over a distance longer than or equal to 15 times as large as a gap from a first upstream-side edge to the undried active material layer even without a spread prevention part.