Electrode Plate Rolling with Thermal Extension to Prevent Wrinkling
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Solution Overview
Problem
The issue of electrode plate wrinkling during the rolling process due to rebound in the uncoated region of lithium-ion battery electrodes, caused by the use of a composite substrate with a plastic layer, is not effectively addressed in current manufacturing processes.
Innovation Solution
An electrode plate rolling apparatus and method that incorporates a heating part and a cooling part to alternately heat and cool the coated and uncoated regions, respectively, with controlled temperature differences to reduce extensibility discrepancies, and an extension assembly to extend the uncoated region during heating, thereby minimizing rebound and wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the uncoated region is heated and extended during rolling, then the extensibility of the uncoated region is improved, but the plastic layer rebounds after heating, causing electrode plate wrinkles
Solution Approach 1:
The patent applies preliminary anti-action by using a cooling assembly positioned immediately after the heating assembly to preemptively counteract the rebound effect. The cooling assembly cools the uncoated region before significant rebound can occur, preventing wrinkle formation while maintaining the extensibility benefits of heating.
Solution Approach 2:
The patent implements feedback control through sensors that detect the temperature and extension state of the uncoated region, with the control system adjusting the heating and cooling assembly operations in real-time. This closed-loop control ensures the uncoated region reaches the desired extension without excessive heating that would cause rebound.
2Adaptability or versatility
If the uncoated region is heated to increase extensibility, then the extension capability is improved, but the difference in extensibility parameter between uncoated and coated regions increases, leading to wrinkling
Solution Approach 1:
The patent applies local quality by selectively heating only the uncoated regions while leaving the coated regions at different temperatures. The heating assembly includes heating units positioned to target specific uncoated regions, and the cooling assembly similarly targets only uncoated regions for localized cooling. This creates a controlled temperature differential that manages extensibility differences between regions.
Solution Approach 2:
The patent utilizes parameter changes by controlling the temperature of the uncoated region through coordinated heating and cooling. The temperature is adjusted within a specific range to achieve optimal extensibility without causing excessive thermal expansion that would increase the extensibility parameter difference between coated and uncoated regions.
3Manufacturing precision
If heating and cooling operations are performed to reduce extensibility difference, then the wrinkle prevention is improved, but the device complexity increases due to additional heating and cooling assemblies
Solution Approach 1:
The patent merges the heating and cooling functions into an integrated rolling apparatus structure. The heating assembly and cooling assembly are combined with the rolling assemblies in a compact arrangement where the cooling assembly is positioned immediately after the heating assembly. This integration reduces space requirements and simplifies the overall system architecture despite the added functional complexity.
Solution Approach 2:
The rolling assemblies serve multiple functions: they provide mechanical rolling pressure and simultaneously support the heating and cooling operations. The heating and cooling assemblies are designed to work in conjunction with the rolling function, creating a multi-functional system that reduces overall device complexity compared to having separate independent systems for each function.
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 apparatus and method effectively reduce the extensibility difference between coated and uncoated regions, preventing electrode plate wrinkling and ensuring smooth rewinding by maintaining the extended state of the uncoated region through controlled temperature adjustments and extension.
Implementation Method 1
the heating part is configured to heat the electrode plate
Implementation Method 2
the cooling part is configured to cool the electrode plate
Implementation Method 3
the extension assembly can extend the uncoated region when the heating part heats the electrode plate
Data Source
AI summary
This application discloses an electrode plate rolling apparatus and an electrode plate rolling method that are configured to roll an electrode plate. The electrode plate includes a coated region and an uncoated region. The electrode plate rolling apparatus includes a roller group, a heating part, and a cooling part. The heating part is configured to heat the electrode plate, and the cooling part is configured to cool the electrode plate. The heating part further includes an extension assembly, and the extension assembly can extend the uncoated region when the heating part heats the electrode plate. The electrode plate passes through the cooling part after passing through the heating part. The heating part and the cooling part are configured to reduce a difference between an extensibility parameter of the uncoated region and an extensibility parameter of the coated region.