Electrode Plate Measurement for Pressing-Induced Loading Loss
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Solution Overview
Problem
The existing method of determining the loading level reduction amount in the pressing process of electrode manufacturing for secondary batteries is inaccurate and unreliable due to reliance on punched samples and manual measurements, which affects the battery's capacity.
Innovation Solution
An apparatus and method using a measurement module with first and second measurement units to measure the electrode plate before and after pressing, and a processor to calculate the change in coating material per unit area based on elongation, ensuring accurate determination of the loading level reduction amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a punching machine is used to extract samples from specific sections of electrode plates for measurement, then the measurement process can be performed, but the accuracy of calculating the loading level reduction amount for the entire electrode plate is reduced
Solution Approach 1:
The electrode plate measurement is divided into multiple sections (first section, second section, third section, fourth section) with different measurement positions. By measuring multiple segments rather than a single sample, the system captures the variability across the entire electrode plate surface, thereby improving the overall measurement accuracy and representativeness.
Solution Approach 2:
Instead of relying on a single punched sample that may not represent the entire electrode plate, the system creates multiple measurements across different sections. This copying approach of measuring multiple areas provides a more comprehensive representation of the loading level reduction amount across the whole electrode plate.
2Ease of operation
If manual measurements by workers are used to determine the loading level reduction amount, then the measurement process can be completed, but the results become unreliable due to variations in measurements by different workers
Solution Approach 1:
The patent replaces manual mechanical measurement operations with an automated measurement system that includes sensors and a controller. This substitution eliminates human variability and subjectivity in measurements, providing consistent, objective, and reliable measurement results while maintaining ease of operation through automation.
Solution Approach 2:
The measurement system is designed to automatically perform measurements and calculations without requiring manual intervention. The system self-calibrates, self-measures across multiple sections, and automatically processes the data to determine the loading level reduction amount, eliminating reliance on worker skill and consistency.
3Manufacturing precision
If the electrode plate is pressed by a pressing roll to achieve target thickness, then the thickness requirement is met, but the electrode plate stretches (elongates), causing a reduction in the coating amount of active material per unit area
Solution Approach 1:
The system performs measurements of the coating amount before the pressing process and then uses these preliminary measurements along with the measured elongation to calculate the expected loading level reduction. This allows for compensation strategies to be planned in advance, such as adjusting the initial coating amount or pressing parameters to achieve the desired final loading level.
Solution Approach 2:
The measurement system provides feedback on the actual elongation of the electrode plate during pressing. This feedback information is used to calculate the actual loading level reduction amount and can be used to adjust subsequent pressing operations or coating parameters to maintain consistent battery capacity and meet manufacturing specifications.
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 determines the loading level reduction amount, enhancing the reliability and precision of battery manufacturing by controlling the stretching of the electrode plate within predefined specifications.
Implementation Method 1
the electrode plate may be stretched (elongated), causing a phenomenon in which a coating amount of the active material per unit area on the electrode plate is reduced
Data Source
AI summary
An apparatus for manufacturing a battery includes: a measurement module configured to measure physical properties of an electrode plate in a pressing process in which the electrode plate coated with a coating material is pressed by a pressing roll, and including a first measurement unit and a second measurement unit; and a processor configured to receive first physical properties of the electrode plate before pressing and second physical properties of the electrode plate after pressing from the first and second measurement units, respectively, and to determine a change in physical properties of the coating material caused by stretching of the electrode plate in the pressing process, wherein the change in physical properties of the coating material caused by the stretching of the electrode plate functions as a factor for defining a capacity of a battery to be manufactured.