Electrode Plate Rolling with Localized Pressing for Wrinkle Control
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Solution Overview
Problem
Wrinkles form in uncoated portions of electrode plates during the rolling process due to differences in elongation between coated and uncoated areas, affecting the quality and safety of battery cells.
Innovation Solution
An apparatus and method that includes a main rolling portion, an adjustment roller portion, and pressing portions to adjust the unloading angle and apply pressure to uncoated areas, using sensors and controllers to identify and address wrinkle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electrode plate is rolled using a conventional main rolling portion, then the active material coating portion is compressed and attached to the substrate, but wrinkles form in the uncoated portions due to differential elongation
Solution Approach 1:
The patent applies different functional characteristics to different regions of the rolling apparatus. Pressing portions are specifically positioned to apply localized pressure only to uncoated portions, while the main rolling portion compresses the active material coating. This local differentiation prevents wrinkles in uncoated areas without affecting the coating attachment process.
Solution Approach 2:
The pressing portions act as intermediary elements between the main rolling portion and the uncoated portions. These intermediaries apply targeted pressure to prevent wrinkle formation in specific areas (uncoated portions) without interfering with the primary rolling function of attaching the active material coating to the substrate.
2Manufacturing precision
If pressing portions are added to prevent wrinkles in uncoated portions, then wrinkle formation is reduced, but the device complexity increases
Solution Approach 1:
The rolling apparatus is segmented into functionally distinct components: the main rolling portion for compressing the active material coating and multiple pressing portions for preventing wrinkles in uncoated areas. Each segment performs a specific function, allowing the system to address multiple problems simultaneously without requiring a complete redesign of the entire apparatus.
Solution Approach 2:
Instead of applying uniform pressure across the entire electrode plate, the pressing portions apply localized pressure only where needed (uncoated portions). This local quality approach prevents wrinkles in specific areas without requiring complex mechanisms to control pressure distribution across the whole plate, thereby limiting the increase in device complexity.
3Manufacturing precision
If the unloading angle is adjusted to prevent wrinkles, then wrinkle formation is reduced, but the adjustment mechanism complexity increases
Solution Approach 1:
The adjustment roller portion is designed to be movable, allowing dynamic adjustment of the unloading angle during the rolling process. This dynamic capability enables the system to adapt to different electrode plate configurations and wrinkle prevention requirements without requiring multiple fixed-angle rollers or complex mechanical adjustment mechanisms.
Solution Approach 2:
The adjustment roller portion serves multiple functions: it guides the electrode plate through the rolling process, controls the unloading angle to prevent wrinkles, and can be positioned to apply additional pressure to uncoated portions. This multi-functionality reduces the need for separate dedicated mechanisms for each function, thereby limiting the increase in overall device complexity.
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
Prevents, reduces, or removes wrinkles in uncoated portions, improving the quality and safety of battery cells by selectively operating pressing portions and adjusting the vertical movement of the uncoated portions.
Implementation Method 1
a plurality of pressing portions (116) configured to press the uncoated portions (114b)
Implementation Method 2
an adjustment roller portion (112) configured to be moved up and down to adjust an unloading angle
Data Source
AI summary
An apparatus for rolling an electrode plate, includes: a main rolling portion including a first rolling portion and a second rolling portion; an adjustment roller portion to be moved up and down and contact one surface of an electrode plate that has passed between the first rolling portion and the second rolling portion, the electrode plate including: a substrate; an active material coating portion on the substrate, the active material coating portion including an active material applied in a plurality of rows on the substrate; and a plurality of uncoated portions corresponding to areas of the substrate where the active material is not applied; and a plurality of pressing portions configured to press the uncoated portions, and located at a rear end of the main rolling portion with respect to a transfer direction of the electrode plate.