Electrode Plate Rolling with Thermal Extension and Rebound Control
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Solution Overview
Problem
The existing electrode plate rolling processes for lithium-ion batteries face issues with wrinkles in the uncoated regions due to rebound during heating, disrupting the rewinding process and affecting the compactness and energy density of the electrode plates.
Innovation Solution
An electrode plate rolling apparatus and method that incorporates a heating part with an extension assembly to heat and extend the uncoated region, followed by a cooling part to reduce the extensibility difference between the coated and uncoated regions, using alternating heating and cooling units to control temperatures and prevent rebound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the uncoated region is heated during rolling to improve extensibility and reduce thickness variation, then the homogeneous distribution of active substance 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 device to cool the uncoated region before heating it during rolling. This pre-cooling creates initial contraction that counteracts the subsequent thermal expansion and rebound effect, preventing wrinkles from forming while still allowing the heating process to achieve the desired thickness uniformity and active substance distribution.
2Reliability
If the uncoated region is heated to extend the material and reduce extensibility difference with coated region, then the compacted density is improved, but the rebound after heating disrupts the rewinding process
Solution Approach 1:
The cooling device applies preliminary anti-action by cooling the uncoated region before heating, creating initial contraction that offsets the subsequent thermal expansion. This prevents excessive extension and rebound that would disrupt rewinding, while still allowing controlled heating to achieve the necessary compacted density for reliable battery assembly.
3Strength
If heating is applied to the uncoated region to improve extensibility during rolling, then the active substance bonding is enhanced, but the extensibility parameter difference between coated and uncoated regions increases causing deformation
Solution Approach 1:
The cooling device applies preliminary anti-action by pre-cooling the uncoated region to create initial contraction. This counteracts the thermal expansion during heating, maintaining better dimensional stability and reducing deformation while still allowing the heating process to enhance active substance bonding through improved extensibility and contact with the substrate.
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 reduces the risk of wrinkling, maintains the extended state of the uncoated region, and enhances the electrode plate's performance by minimizing the extensibility discrepancy between coated and uncoated regions, ensuring smooth rewinding and improved energy density.
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.