Coiled Electrode Drying via Core Heating
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Solution Overview
Problem
The existing drying methods for lithium ion secondary battery electrodes, such as the general-purpose radiation vacuum dryer, take a long time to dry the coiled electrodes due to insufficient heat transfer from the surface to the core, leading to prolonged drying times and increased production costs.
Innovation Solution
A drying device with a heating unit that directly heats the coiled electrode from the winding core, using heat conduction to transfer heat from the core to the surface, creating tiny spaces between layers for efficient moisture evaporation, and simultaneously reducing pressure to enhance drying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat is transferred from the outside to the inside of the power storage element, then moisture can be evaporated, but it takes a long time for heat transfer and drying time becomes longer
Solution Approach 1:
Instead of heating from the outside surface inward, the invention heats from the inside core outward by placing a heating element within the winding core. This inverted heating approach allows heat to reach the moisture-containing electrode material directly from the center, dramatically reducing drying time while ensuring thorough moisture removal from all layers.
Solution Approach 2:
The heating element serves as an intermediary device placed inside the winding core to transfer heat directly to the electrode layers. This intermediary approach enables efficient heat distribution from the center outward, solving the problem of slow external heat penetration while maintaining effective moisture evaporation throughout the power storage element.
2Ease of manufacture
If a general-purpose radiation vacuum dryer is used, then drying can be performed, but heat transfer from surface to core is insufficient leading to prolonged drying times
Solution Approach 1:
The heating element within the winding core enables the power storage element to heat itself from the inside. This self-service heating mechanism eliminates dependence on external heat sources that struggle to penetrate to the core, thereby dramatically improving drying efficiency and productivity while maintaining ease of manufacture through integration into the existing winding structure.
Solution Approach 2:
The invention inverts the conventional drying approach by heating from the inside core outward rather than from the outside surface inward. This inversion resolves the insufficient heat transfer problem of general-purpose dryers, enabling efficient moisture removal throughout the entire power storage element and significantly improving drying productivity.
3Ease of manufacture
If electrodes are cut from coiled electrode and power storage element is formed, then battery assembly can be completed, but moisture remains in electrodes requiring extended drying
Solution Approach 1:
The heating element is installed in the winding core before the electrode is wound and the power storage element is assembled. This preliminary action allows the heating structure to be in place during the winding process, enabling immediate internal heating and moisture evaporation throughout production, thereby reducing subsequent drying time while maintaining ease of manufacturing assembly.
Solution Approach 2:
The heating element acts as an intermediary that enables moisture removal during and after the electrode winding and power storage element formation processes. By being integrated into the winding core structure, it provides continuous heating capability that reduces the need for extended external drying while facilitating smooth battery assembly operations.
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 approach significantly shortens the drying time by ensuring even heating and evaporation of moisture from both the surface and core, reducing the overall production time and costs associated with increased dryer usage.
Implementation Method 1
A drying device with a heating unit that directly heats the coiled electrode from the winding core, using heat conduction to transfer heat from the core to the surface
Implementation Method 2
creating tiny spaces between layers for efficient moisture evaporation
Implementation Method 3
simultaneously reducing pressure to enhance drying efficiency
Data Source
AI summary
The present invention aims to shorten a drying time for time for drying a coiled electrode. To this end, a drying device for drying the coiled electrode wound on a winding core includes a heating unit for heating the coiled electrode from a winding core side. Since this enables heat to be transferred from a core part toward a surface of the coiled electrode, tiny spaces can be generated between layers of an electrode and moisture can be evaporated from these spaces. Thus, moisture of the core part side, which has been difficult to evaporate, can be reliably evaporated and a drying time for the coiled electrode can be shortened.