Electrode Lithiation Rolling Control for Tab Alignment
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Solution Overview
Problem
During the winding and stacking of lithiated electrode plates in battery cell manufacturing, tab misalignment frequently occurs due to variations in the thickness and length of the lithiated electrode plates, leading to reduced battery cell yield.
Innovation Solution
A lithiation device equipped with a rolling mechanism, an adjustment mechanism, and a first monitoring mechanism to accurately monitor and adjust the length of the lithiated electrode plates, ensuring alignment and consistency during the winding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the lithiation device applies lithium film on the electrode plate using rolling mechanism, then the battery capacity is improved by compensating lithium loss, but the thickness and length of the lithiated electrode plate become inconsistent causing tab misalignment
Solution Approach 1:
The patent implements a feedback control system where a monitoring mechanism measures the length of the lithiated electrode plate after rolling, and a controller adjusts the rolling parameters based on the measured length to achieve the target length. This closed-loop feedback ensures consistent length despite variations in electrode plate thickness or lithium film application
Solution Approach 2:
The patent changes the rolling parameters (such as rolling force, speed, or temperature) dynamically based on the monitored length of the lithiated electrode plate. By adjusting these parameters in real-time, the system compensates for variations and maintains consistent length and shape of the electrode plate
2Reliability
If the rolling mechanism increases rolling force to ensure lithium film application, then the lithiation effect is improved, but the length of the electrode plate varies more causing greater tab misalignment
Solution Approach 1:
The monitoring mechanism detects the length of the lithiated electrode plate and feeds this information back to the controller, which then adjusts the rolling force to compensate for any length variations. This feedback loop ensures that higher rolling force does not lead to excessive length variation
Solution Approach 2:
The patent makes the rolling force dynamic rather than static. The rolling mechanism adjusts its force in real-time based on the monitored length, allowing the system to apply higher force when needed for effective lithiation while preventing excessive force that would cause length variation
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 device effectively prevents tab misalignment by accurately monitoring and adjusting the length of the lithiated electrode plates, thereby increasing the yield and performance of battery cells.
Implementation Method 1
a rolling mechanism, including a first roller and a second roller, where the first roller and the second roller are configured to roll the electrode plate and the lithium film so as to apply the lithium film on the electrode plate
Data Source
AI summary
This application discloses a lithiation device for applying a lithium film on an electrode plate. The lithiation device includes: a rolling mechanism including a first roller and a second roller, the two rollers configured to roll the electrode plate and the lithium film to apply the lithium film on the electrode plate; an adjustment mechanism connected to the rolling mechanism and configured to adjust a gap and/or a rolling force between the first roller and the second roller; a first monitoring mechanism configured to monitor a length of the electrode plate after the electrode plate passes through the rolling mechanism; and a controller configured to control the adjustment mechanism based on a comparison result of the length monitored by the first monitoring mechanism and a target length so that the length of the electrode plate after the electrode plate passes through the rolling mechanism approximates to the target length.