Electrode Crack Force Measurement for Delamination Prediction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods struggle to accurately predict the occurrence of cracks and delamination in electrodes during the manufacturing process, particularly due to the limitations of using adhesive force as an index for cohesive force, which fails to account for the cohesive force between particles.
Innovation Solution
A method involving measuring the crack force of a dried electrode by applying an indenter at specific angles and speeds, collecting indentation load values, and predicting cracks and delamination based on crack force and strain energy values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive force is measured to prevent cracks and delamination, then the attractive force between foil and electrode is evaluated, but the cohesive force between particles in the electrode cannot be accounted for
Solution Approach 1:
The patent introduces a new measurement parameter (crack force) to supplement the existing adhesive force measurement. By changing the measurement parameter from only adhesive force to include both adhesive force and crack force, the system can now account for both the attractive force between foil and electrode and the cohesive force between particles, thereby resolving the incompleteness of the measurement index
Solution Approach 2:
The patent uses crack force measurement as an intermediary indicator to indirectly assess the cohesive force between particles. Since directly measuring cohesive force is difficult, the crack force serves as a mediator that reflects the internal strength and bonding characteristics of the electrode material, enabling comprehensive evaluation without directly measuring the elusive cohesive force
2Reliability
If adhesive force is used as the sole index, then the measurement process is simple, but it is difficult to predict 100% of defect phenomena
Solution Approach 1:
The patent adds crack force measurement as a supplementary parameter to the existing adhesive force measurement system. This parameter change enables the detection of both interfacial bonding (adhesive force) and internal particle cohesion (crack force), significantly improving defect prediction accuracy while maintaining a relatively simple dual-parameter measurement approach
3Productivity
If excessive heat is applied during drying to remove internal solvent, then the drying efficiency is improved, but the electrode develops wrinkles and cracks
Solution Approach 1:
The patent performs crack force measurement on the dried electrode before final assembly and testing. This preliminary detection allows identification of electrodes with poor crack resistance, enabling early intervention or rejection of defective electrodes before they cause problems in subsequent battery manufacturing steps, thus preventing waste of time and resources
Solution Approach 2:
The crack force measurement provides feedback on the drying process quality. By measuring crack force and correlating it with drying conditions, the system can optimize drying parameters to achieve the right balance between drying efficiency and electrode integrity, preventing wrinkles and cracks while maintaining productivity
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
Accurately predicts the likelihood of cracks and delamination, reducing defects in the electrode manufacturing process by quantifying cohesive force and providing data for improved process control.
Implementation Method 1
press-fitting a measuring point having an indenter into the surface of the electrode to be analyzed; collecting indentation load values applied to the measuring point for each indentation depth value
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The present invention relates to a method for predicting the occurrence of electrode crack and delamination, and the objective of the present invention is to provide a method for predicting the occurrence of electrode crack and delamination, the method comprising: measuring crack force for a dried electrode; and predicting the occurrence of crack and delamination of the electrode on the basis of the measured crack force.